A flammable, poisonous gas with a characteristic odor of rotten eggs. It is used in the manufacture of chemicals, in metallurgy, and as an analytical reagent. (From Merck Index, 11th ed)
A multifunctional pyridoxal phosphate enzyme. In the final step in the biosynthesis of cysteine it catalyzes the cleavage of cystathionine to yield cysteine, ammonia, and 2-ketobutyrate. EC 4.4.1.1.
Chemical groups containing the covalent sulfur bonds -S-. The sulfur atom can be bound to inorganic or organic moieties.
A multifunctional pyridoxal phosphate enzyme. In the second stage of cysteine biosynthesis it catalyzes the reaction of homocysteine with serine to form cystathionine with the elimination of water. Deficiency of this enzyme leads to HYPERHOMOCYSTEINEMIA and HOMOCYSTINURIA. EC 4.2.1.22.
The first chemical element in the periodic table. It has the atomic symbol H, atomic number 1, and atomic weight [1.00784; 1.00811]. It exists, under normal conditions, as a colorless, odorless, tasteless, diatomic gas. Hydrogen ions are PROTONS. Besides the common H1 isotope, hydrogen exists as the stable isotope DEUTERIUM and the unstable, radioactive isotope TRITIUM.
A low-energy attractive force between hydrogen and another element. It plays a major role in determining the properties of water, proteins, and other compounds.
A strong oxidizing agent used in aqueous solution as a ripening agent, bleach, and topical anti-infective. It is relatively unstable and solutions deteriorate over time unless stabilized by the addition of acetanilide or similar organic materials.
Hydrocarbons with at least one triple bond in the linear portion, of the general formula Cn-H2n-2.
Inorganic salts of thiosulfuric acid possessing the general formula R2S2O3.
Compounds containing carbon-phosphorus bonds in which the phosphorus component is also bonded to one or more sulfur atoms. Many of these compounds function as CHOLINERGIC AGENTS and as INSECTICIDES.
An element that is a member of the chalcogen family. It has an atomic symbol S, atomic number 16, and atomic weight [32.059; 32.076]. It is found in the amino acids cysteine and methionine.
Enzymes which transfer sulfur atoms to various acceptor molecules. EC 2.8.1.
A thiol-containing non-essential amino acid that is oxidized to form CYSTINE.
Organic compounds containing the radical -CSNH2.
Inorganic or organic compounds that contain sulfur as an integral part of the molecule.
A compound that inhibits aminobutyrate aminotransferase activity in vivo, thereby raising the level of gamma-aminobutyric acid in tissues.
An enzyme that catalyzes the biosynthesis of cysteine in microorganisms and plants from O-acetyl-L-serine and hydrogen sulfide. This enzyme was formerly listed as EC 4.2.99.8.
Heteromultimers of Kir6 channels (the pore portion) and sulfonylurea receptor (the regulatory portion) which affect function of the HEART; PANCREATIC BETA CELLS; and KIDNEY COLLECTING DUCTS. KATP channel blockers include GLIBENCLAMIDE and mitiglinide whereas openers include CROMAKALIM and minoxidil sulfate.
Any substance in the air which could, if present in high enough concentration, harm humans, animals, vegetation or material. Substances include GASES; PARTICULATE MATTER; and volatile ORGANIC CHEMICALS.
A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs (Lehninger, Principles of Biochemistry, 1982, p471).
Inorganic salts of sulfurous acid.
Softening or loss of brain tissue following CEREBRAL INFARCTION; cerebral ischemia (see BRAIN ISCHEMIA), infection, CRANIOCEREBRAL TRAUMA, or other injury. The term is often used during gross pathologic inspection to describe blurred cortical margins and decreased consistency of brain tissue following infarction. Multicystic encephalomalacia refers to the formation of multiple cystic cavities of various sizes in the cerebral cortex of neonates and infants following injury, most notably perinatal hypoxia-ischemic events. (From Davis et al., Textbook of Neuropathology, 2nd ed, p665; J Neuropathol Exp Neurol, 1995 Mar;54(2):268-75)
Inorganic salts of sulfuric acid.
A NADPH-dependent oxidase that reduces hydrogen sulfite to HYDROGEN SULFIDE. It is found in many microoganisms.
An offensive, foul breath odor resulting from a variety of causes such as poor oral hygiene, dental or oral infections, or the ingestion of certain foods.
Methods, procedures, and tests performed to diagnose disease, disordered function, or disability.
Shortened forms of written words or phrases used for brevity.
An institute of the CENTERS FOR DISEASE CONTROL AND PREVENTION which is responsible for assuring safe and healthful working conditions and for developing standards of safety and health. Research activities are carried out pertinent to these goals.
Published materials which provide an examination of recent or current literature. Review articles can cover a wide range of subject matter at various levels of completeness and comprehensiveness based on analyses of literature that may include research findings. The review may reflect the state of the art. It also includes reviews as a literary form.
A systematic statement of policy rules or principles. Guidelines may be developed by government agencies at any level, institutions, professional societies, governing boards, or by convening expert panels. The text may be cursive or in outline form but is generally a comprehensive guide to problems and approaches in any field of activity. For guidelines in the field of health care and clinical medicine, PRACTICE GUIDELINES AS TOPIC is available.
An approach of practicing medicine with the goal to improve and evaluate patient care. It requires the judicious integration of best research evidence with the patient's values to make decisions about medical care. This method is to help physicians make proper diagnosis, devise best testing plan, choose best treatment and methods of disease prevention, as well as develop guidelines for large groups of patients with the same disease. (from JAMA 296 (9), 2006)
Procedures concerned with the remedial treatment or prevention of diseases.
The gradual destruction of a metal or alloy due to oxidation or action of a chemical agent. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
Acquired or learned responses which are regularly manifested.
The behaviors of materials under force.
Botanically, a type of single-seeded fruit in which the pericarp enclosing the seed is a hard woody shell. In common usage the term is used loosely for any hard, oil-rich kernel. Of those commonly eaten, only hazel, filbert, and chestnut are strictly nuts. Walnuts, pecans, almonds, and coconuts are really drupes. Brazil nuts, pistachios, macadamias, and cashews are really seeds with a hard shell derived from the testa rather than the pericarp.
The exposure to potentially harmful chemical, physical, or biological agents that occurs as a result of one's occupation.
The volatile portions of substances perceptible by the sense of smell. (Grant & Hackh's Chemical Dictionary, 5th ed)
Hydrogen cyanide (HCN); A toxic liquid or colorless gas. It is found in the smoke of various tobacco products and released by combustion of nitrogen-containing organic materials.
Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)
A republic in western Africa, south of GUINEA and west of LIBERIA. Its capital is Freetown.
The vapor state of matter; nonelastic fluids in which the molecules are in free movement and their mean positions far apart. Gases tend to expand indefinitely, to diffuse and mix readily with other gases, to have definite relations of volume, temperature, and pressure, and to condense or liquefy at low temperatures or under sufficient pressure. (Grant & Hackh's Chemical Dictionary, 5th ed)
Treatment for the prevention of periodontal diseases or other dental diseases by the cleaning of the teeth in the dental office using the procedures of DENTAL SCALING and DENTAL POLISHING. The treatment may include plaque detection, removal of supra- and subgingival plaque and calculus, application of caries-preventing agents, checking of restorations and prostheses and correcting overhanging margins and proximal contours of restorations, and checking for signs of food impaction.
A procedure for smoothing of the roughened root surface or cementum of a tooth after subgingival curettage or scaling, as part of periodontal therapy.
Removal of dental plaque and dental calculus from the surface of a tooth, from the surface of a tooth apical to the gingival margin accumulated in periodontal pockets, or from the surface coronal to the gingival margin.

Physiological and morphological observations on Thiovulum sp. (1/815)

Cell suspensions of Thiovulum sp., collected from enrichment cultures, were grown, maintained, and harvested for periods up to 7 months. In open-flow cultures run with aerated seawater, a continuous supply of hydrogen sulfide was provided by diffusion through a semipermeable membrane from either a live culture of Desulfovibrio esturaii, neutralized sodium sulfide, or a N2-H2S gas mixture. Attempts to grow Thiovulum in pure culture failed despite variation in concentrations of dissolved oxygen and hydrogen sulfide in stratified as well as in completely mixed systems. Uptake of 14CO2 and some organic compounds by purified cell suspensions was measured, and values were corrected for the activity of heterotrophic as well as autotrophic contaminants as determined in control experiments. Cell populations exhibited maximum uptake activities during formation of the characteristic veils. Substantial uptake of CO2 in air-saturated seawater was coincident with an optimal concentration of hydrogen sulfide of about 1 mM. Glutamate and a selection of vitamins (B12M biotin, and thiamine) did not significantly affect the uptake of CO2. No substantial uptake of carbon from acetate, glutamate, mannitol, and Casamino Acids was found. Within the range of error indicated, the data are consistent with acceptance of a chemolithotrophic nature of Thiovulum.  (+info)

Roots as a site of hydrogen sulfide uptake in the hydrocarbon seep vestimentiferan Lamellibrachia sp. (2/815)

Vestimentiferan tubeworms have no mouth or gut, and the majority of their nutritional requirements are provided by endosymbiotic bacteria that utilize hydrogen sulfide oxidation to fix CO(2) into organic molecules. It has been assumed that all vestimentiferans obtain the sulfide, O(2) and CO(2) needed by the bacteria across the plume (gill) surface, but some live in locations where very little sulfide is available in the sea water surrounding the plume. We propose that at least some of these vestimentiferans can grow a posterior extension of their body and tube down into the sea-floor sediment, and that they can use this extension, which we call the 'root', to take up sulfide directly from the interstitial water. In this study of the vestimentiferan Lamellibrachia sp., found at hydrocarbon seeps in the Gulf of Mexico at depths of approximately 700 m, we measured seawater and interstitial sulfide concentrations in the hydrocarbon seep habitat, determined the structural characteristics of the root tube using transmission electron microscopy, characterized the biochemical composition of the tube wall, and measured the sulfide permeability of the root tube. We found that, while the sulfide concentration is less than 1 (micro)mol l(-)(1) in the sea water surrounding the gills, it can be over 1.5 mmol l(-)(1) at a depth of 10-25 cm in sediment beneath tubeworm bushes. The root tube is composed primarily of giant (&bgr;)-chitin crystallites (12-30 % of total mass) embedded in a protein matrix (50 % of total mass). Root tubes have a mean diameter of 1.4 mm, a mean wall thickness of 70 (micro)m and can be over 20 cm long. The tubeworm itself typically extends its body to the distal tip of the root tube. The root tube wall was quite permeable to sulfide, having a permeability coefficient at 20 degrees C of 0. 41x10(-)(3 )cm s(-)(1), with root tube being 2.5 times more permeable to sulfide than trunk tube of the same diameter. The characteristics of the root suggest that it reaches down to the higher sulfide levels present in the deeper sediment and that it functions to increase the surface area available for sulfide uptake in a manner analogous to a respiratory organ.  (+info)

Long-term effects on the olfactory system of exposure to hydrogen sulphide. (3/815)

OBJECTIVE: To study chronic effects of hydrogen sulphide (H2S) on cranial nerve I (nervi olfactorii), which have been only minimally described. METHODS: Chemosensations (smell and taste) were evaluated in eight men who complained of continuing dysfunction 2-3 years after the start of occupational exposure to H2S. Various bilateral (both nostrils) and unilateral (one nostril at a time) odour threshold tests with standard odorants as well as the Chicago smell test, a three odour detection and identification test and the University of Pennsylvania smell identification test, a series of 40 scratch and sniff odour identification tests were administered. RESULTS: Six of the eight patients showed deficits of various degrees. Two had normal scores on objective tests, but thought that they continued to have problems. H2S apparently can cause continuing, sometimes unrecognised olfactory deficits. CONCLUSION: Further exploration into the extent of such problems among workers exposed to H2S is warranted.  (+info)

On the occurrence of anoxic microniches, denitrification, and sulfate reduction in aerated activated sludge. (4/815)

A combination of different methods was applied to investigate the occurrence of anaerobic processes in aerated activated sludge. Microsensor measurements (O(2), NO(2)(-), NO(3)(-), and H(2)S) were performed on single sludge flocs to detect anoxic niches, nitrate reduction, or sulfate reduction on a microscale. Incubations of activated sludge with (15)NO(3)(-) and (35)SO(4)(2-) were used to determine denitrification and sulfate reduction rates on a batch scale. In four of six investigated sludges, no anoxic zones developed during aeration, and consequently denitrification rates were very low. However, in two sludges anoxia in flocs coincided with significant denitrification rates. Sulfate reduction could not be detected in any sludge in either the microsensor or the batch investigation, not even under short-term anoxic conditions. In contrast, the presence of sulfate-reducing bacteria was shown by fluorescence in situ hybridization with 16S rRNA-targeted oligonucleotide probes and by PCR-based detection of genes coding for the dissimilatory sulfite reductase. A possible explanation for the absence of anoxia even in most of the larger flocs might be that oxygen transport is not only diffusional but enhanced by advection, i.e., facilitated by flow through pores and channels. This possibility is suggested by the irregularity of some oxygen profiles and by confocal laser scanning microscopy of the three-dimensional floc structures, which showed that flocs from the two sludges in which anoxic zones were found were apparently denser than flocs from the other sludges.  (+info)

Detoxification of hydrogen sulfide and methanethiol in the cecal mucosa. (5/815)

Colonic bacteria liberate large quantities of the highly toxic gases hydrogen sulfide (H(2)S) and methanethiol (CH(3)SH). The colonic mucosa presumably has an efficient means of detoxifying these compounds, which is thought to occur through methylation of H(2)S to CH(3)SH and CH(3)SH to dimethylsulfide (CH(3)SCH(3)). We investigated this detoxification pathway by incubating rat cecal mucosal homogenates with gas containing H(2)S, CH(3)SH, or CH(3)SCH(3). Neither CH(3)SH nor CH(3)SCH(3) was produced during H(2)S catabolism, whereas catabolism of CH(3)SH liberated H(2)S but not CH(3)SCH(3). Thus, H(2)S and CH(3)SH are not detoxified by methylation to CH(3)SCH(3). Rather, CH(3)SH is demethylated to H(2)S, and H(2)S is converted to nonvolatile metabolites. HPLC analysis of the homogenate showed the metabolite to be primarily thiosulfate. Analysis of cecal venous blood obtained after intracecal instillation of H(2)(35)S revealed that virtually all absorbed H(2)S had been oxidized to thiosulfate. The oxidation rate of H(2)S by colonic mucosa was 10,000 times greater than the reported methylation rate. Conversion to thiosulfate appears to be the mechanism whereby the cecal mucosa protects itself from the injurious effects of H(2)S and CH(3)SH, and defects in this detoxification possibly could play a role in colonic diseases such as ulcerative colitis.  (+info)

The contribution of sulphate reducing bacteria and 5-aminosalicylic acid to faecal sulphide in patients with ulcerative colitis. (6/815)

BACKGROUND: Butyrate oxidation within the colonocyte is selectively inhibited by hydrogen sulphide, reproducing the metabolic lesion observed in active ulcerative colitis. AIMS: To study generation of hydrogen sulphide by sulphate reducing bacteria (SRB) and the effects of 5-aminosalicylic acid (5-ASA) in patients with ulcerative colitis in order to identify a role of this noxious agent in pathogenesis. PATIENTS: Fresh faeces were obtained from 37 patients with ulcerative colitis (23 with active disease) and 16 healthy controls. METHODS: SRB were enumerated from fresh faecal slurries and measurements made of sulphate reducing activity, and sulphate and hydrogen sulphide concentrations. The effect of 5-ASA on hydrogen sulphide production was studied in vitro. RESULTS: All controls and patients with active ulcerative colitis carried SRB and total viable counts were significantly related to the clinical severity grade. SRB were of two distinct types: rapidly growing strains (desulfovibrios) which showed high sulphate reduction rates, present in 30% of patients with ulcerative colitis and 44% of controls; and slow growing strains which had little activity. In vitro, 5-ASA inhibited sulphide production in a dose dependent manner; in patients with ulcerative colitis not on these drugs faecal sulphide was significantly higher than in controls (0.55 versus 0.25 mM, p=0.027). CONCLUSIONS: Counts and carriage rates of SRB in faeces of patients with ulcerative colitis are not significantly different from those in controls. SRB metabolism is not uniform between strains and alternative sources of hydrogen sulphide production exist in the colonic lumen which may be similarly inhibited by 5-ASA. The evidence for hydrogen sulphide as a metabolic toxin in ulcerative colitis remains circumstantial.  (+info)

Mucin secretion is modulated by luminal factors in the isolated vascularly perfused rat colon. (7/815)

BACKGROUND: Mucins play an important protective role in the colonic mucosa. Luminal factors modulating colonic mucus release have been not fully identified. AIM: To determine the effect of some dietary compounds on mucus discharge in rat colon. METHODS: An isolated vascularly perfused rat colon model was used. Mucus secretion was induced by a variety of luminal factors administered as a bolus of 1 ml for 30 minutes in the colonic loop. Mucin release was evaluated using a sandwich enzyme linked immunosorbent assay supported by histological analysis. RESULTS: The three dietary fibres tested in this study (pectin, gum arabic, and cellulose) did not provoke mucus secretion. Luminal administration of sodium alginate (an algal polysaccharide used as a food additive) or ulvan (a sulphated algal polymer) induced a dose dependent increase in mucin discharge over the concentration range 1-25 mg/l (p<0.05 for 25 mg/l alginate and p<0.05 for 10 and 25 mg/l ulvan). Glucuronic acid and galacturonic acid, which are major constituents of a variety of fibres, produced significant mucin secretion (p<0.05). Hydrogen sulphide and mercaptoacetate, two sulphides produced in the colonic lumen by microbial fermentation of sulphated polysaccharides, did not modify mucin secretion. Among the short chain fatty acids, acetate (5-100 mM) induced a dose dependent release of mucus (p<0.05 for 100 mM acetate). Interestingly, butyrate at a concentration of 5 mM produced colonic mucin secretion (p<0.05), but increasing its concentration to 100 mM provoked a gradual decrease in mucus discharge. Propionate (5-100 mM) did not induce mucin release. Several dietary phenolic compounds (quercetin, epicatechin, resveratrol) did not provoke mucus discharge. CONCLUSIONS: Two algal polysaccharides (alginate and ulvan), two uronic acids (glucuronic acid and galacturonic acid), and the short chain fatty acids acetate and butyrate induce mucin secretion in rat colon. Taken together, these data suggest that some food constituents and their fermentation products may regulate the secretory function of colonic goblet cells.  (+info)

Improved plating media for the detection of Salmonella species with typical and atypical hydrogen sulfide production. (8/815)

The Salmonella detection ability of 2 surfactant-supplemental media, xylose-lysine-tergitol (Nia-proof) 4 (XLT4) and Miller-Mallinson (MM) agar, was compared against that of several commonly used plating media. XLT4 and MM appeared to be the most efficient in detecting Salmonella in meat products and food animal environments. MM was superior to XLT4 in detecting those increasingly more prevalent strains of Salmonella possessing weak to ultraweak H2S production characteristics.  (+info)

The main aim of the study is to examine the effect of sodium hydrosulfide (NaHS), an H2S donor, on the oxidative stress in human plasma in vitro. It also examined the effects of very high concentrations of exogenous hydrogen sulfide on the hemostatic parameters (coagulation and fibrinolytic activity) of human plasma. Plasma was incubated for 5–30 min with different concentrations of NaHS from 0.01 to 10 mM. Following this, lipid peroxidation was measured as a thiobarbituric acid reactive substance (TBARS) concentration and the oxidation of amino acid residues in proteins was measured by determining the amounts of thiol groups and carbonyl groups. Hydrogen peroxide (H2O2) and the hydroxyl radical generating oxidation system (Fe/H2O2) were used as oxidative stress inducers. Hemostatic factors, such as the maximum velocity of clot formation, fibrin lysis half-time, the activated partial thromboplastin time (APTT), thrombin time (TT), and international normalized ratio (INR), were estimated. Changes
Please click your Back button to return to the previous Upgrade Page) Hydrogen Sulfide (H2S) Safety Program Background: Hydrogen sulfide presents a potential hazard to workers at the work site. It usually occurs as an unwanted by-product and can result in worker exposure in many different industries or occupations. To ensure protection against exposure to hydrogen sulfide, both workers and employers must be aware of its properties, how it affects the body and what to do in emergency situations. The Safety and Health Manager shall ensure that all personnel who will be working at the job site will be properly trained in Hydrogen sulfide awareness and contingency procedures. Occurrence of Hydrogen Sulfide: Hydrogen sulfide exposures usually occur during the drilling for or production of natural gas, crude oil and petroleum products. Hydrogen sulfide is also produced by the putrefication of organic matter and may accumulate in sewers, sewage treatment plants or hide storage pits in the tanning ...
TY - JOUR. T1 - Role of Hydrogen Sulfide as a Gasotransmitter in Modulating Contractile Activity of Circular Muscle of Rat Jejunum. AU - Nagao, Munenori. AU - Duenes, Judith A.. AU - Sarr, Michael G.. PY - 2012/2. Y1 - 2012/2. N2 - Aim: Our aim was to determine mechanisms of action of the gasotransmitter hydrogen sulfide (H 2S) on contractile activity in circular muscle of rat jejunum. Methods: Jejunal circular muscle strips were prepared to measure isometric contractions. Effects of sodium hydrosulfide (NaHS), a H 2S donor, were evaluated on spontaneous contractile activity and after pre-contraction with bethanechol. l-Cysteine was evaluated as an endogenous H 2S donor. We evaluated extrinsic nerves, enteric nervous system, visceral afferent nerves, nitric oxide, K + ATP and K + CA channels, and myosin light chain phosphatase on action of H 2S using non-adrenergic/non-cholinergic conditions, tetrodotoxin, capsaicin, l-N G-nitro arginine (l-NNA), glibenclamide, apamin, and calyculin A, ...
The discourse relative to the legal responsibility for using defective drywall and to the nature of the chemicals which emit the hydrogen sulfide will undoubtedly continue for a long time. However, the basic fact that hydrogen sulfide is toxic and exposure to it is harmful in not questioned. Therefore, it is incumbent on all the responsible parties to immediately stop the exposure of people to HYDROGEN SULFIDE to prevent recurring harm to their health and damage to their property.. The toxicity of hydrogen sulfide is manifested in two different mechanisms: A. HYDROGEN SULFIDE reacts with the iron in the blood and depletes it and thus can have negative impact on the respiratory function of the body and the transfer of oxygen. This effect is more dangerous when the exposed people are old, children or infants, pregnant woman and people with respiratory issues, and, B. Chronic exposure even to minute concentrations of HYDROGEN SULFIDE (and sulfur oxides) reduce the resistance of the lungs to viral ...
Endogenous hydrogen sulfide (H(2)S) is hypothesized to have an important role in systemic inflammation. We investigated if endogenous H(2)S may be a crucial mediator in airway inflammation and airway remodeling in a rat model of asthma and if endogenous H(2)S may exert its anti-inflammatory effect by inhibiting inducible nitric oxide synthase (iNOS)/NO pathway. Cystathionine-gamma-lyase (CSE; a H(2)S-synthesizing enzyme) was mainly expressed in airway and vascular smooth muscle cells in rat lung tissue. Levels of endogenous H(2)S was decreased in pulmonary tissue in ovalbumin (OVA)-treated rats. Exogenous administration of NaHS alleviated airway inflammation and airway remodeling: peak expiratory flow (PEF) increased, goblet cell hyperplasia and collagen deposition score decreased, with decreased total cells recovered from bronchoalveolar fluid (BALF) and influx of eosinophils and neutrophils. The H(2)S levels of serum and lung tissue were positively correlated with PEF and negatively correlated ...
TY - JOUR. T1 - Hydrogen sulfide donor micelles protect cardiomyocytes from ischemic cell death. AU - Takatani-Nakase, T.. AU - Katayama, M.. AU - Matsui, C.. AU - Hanaoka, K.. AU - Van Der Vlies, A. J.. AU - Takahashi, K.. AU - Nakase, I.. AU - Hasegawa, U.. N1 - Funding Information: This work was supported in part by JSPS KAKENHI (JP16H02612 for I. N.). The manuscript preparation was assisted by Kayo Hirano (Osaka Prefecture University).. PY - 2017. Y1 - 2017. N2 - Hydrogen sulfide, an important gaseous signaling molecule in the human body, is known to protect cardiomyocytes from ischemia, a condition characterized by insufficient oxygen supply to the cells. Here we show that a nanosized H2S donor micelle releases H2S intracellularly and prevents cardiomyocyte apoptosis in an in vitro ischemia model.. AB - Hydrogen sulfide, an important gaseous signaling molecule in the human body, is known to protect cardiomyocytes from ischemia, a condition characterized by insufficient oxygen supply to the ...
Good-Rite® Sodium Hydrosulfide (NaSH) is a clear, aqueous solution that is used as a depilotory (de-hairing) agent in the tanning industry.
...Hydrogen sulfide (H2S) may play a wide-ranging role in staving off agi... H2S has been gaining increasing attention as an important endogenous ...Hydrogen sulfide is produced within the human body and has a variety ...The gene klotho which appears to be upregulated by hydrogen sulfide...,Hydrogen,sulfide:,The,next,anti-aging,agent?,biological,biology news articles,biology news today,latest biology news,current biology news,biology newsletters
The possible role of hydrogen sulfide (H2S) in cardioprotection was investigated in isolated rat ventricular myocytes exposed to severe metabolic inhibition (MI) in glucose-free buffer containing 2-deoxy-D-glucose (2-DOG), an inhibitor of glycolysis. Pretreatment (30:min) with NaHS (a H 2S donor) at concentrations of 10-5 to 10-4 mol/L caused a concentration related increase in cell viability and the ratio of rod-shaped cells. A time course study showed that NaHS-induced cardioprotection occurred in 2 time windows (~1:h and 16-28:h). To observe whether endogenous H2S may be involved in the delayed cardioprotection response of IP, DL-propargylglycine (PAG) and β-cyano-L-alanine (BCA; two inhibitors of H2S biosynthesis) were used. Both drugs significantly attenuated the cardioprotection produced by MI using cell viability, cellular injury index, and electrically-induced [Ca2+]i transients as end-points. These data suggest that endogenous H2S plays an important role in the cardioprotection ...
Hydrogen sulfide (H2S), the third endogenous gaseous signaling molecule alongside nitric oxide (NO) and carbon monoxide, is synthesized by multiple enzymes in cardiovascular system. Similar to other gaseous mediators, H2S has demonstrated a variety of biological activities, including anti-oxidative, anti-apoptotic, pro-angiogenic, vasodilating capacities and endothelial NO synthase modulating activity, and regulates a wide range of pathophysiological processes in cardiovascular disorders. However, the underlying mechanisms by which H2S mediates cardiovascular homeostasis are not fully understood. This review focuses on the recent progress on functional and mechanistic aspects of H2S in the inflammatory and immunoregulatory processes of cardiovascular disorders, importantly myocardial ischemia, heart failure, and atherosclerosis. Moreover, we highlight the challenges for developing H2S-based therapy to modulate the pathological processes in cardiovascular diseases. A better understanding of the
Hydrogen sulfide (H2S) is an endogenous gasotransmitter in human physiology and inflammatory disease, however, with limited knowledge of how signal transduction pathways are involved in immune cells. To examine the effects of sulfide on relevant intracellular signaling in human peripheral blood mononuclear cells (PBMCs), we stimulated healthy donor PBMCs with sodium hydrosulfide (NaHS, 1-1000 μM) to mimic H2S stimulation, and analyzed phosphorylation of p38 mitogen activated protein kinase (MAPK) (pT180/pY182), NF-κB p65 (pS529), Akt (pS473) and CREB/ATF1 (pS133/pS63) with flow and mass cytometry. In contrast to transient effects in subsets of lymphocytes, classical monocytes demonstrated sustained phosphorylation of p38, Akt and CREB/ATF1. NaHS induced calcium dependent phosphorylation of p38, Akt and CREB, but not NF-κB, and the phosphorylation of Akt was partly dependent on p38, indicative of p38-Akt crosstalk. Attenuation of these effects by molecules targeting p38 and Hsp90 indicated ...
TY - JOUR. T1 - 8-Mercapto-Cyclic GMP Mediates Hydrogen Sulfide-Induced Stomatal Closure in Arabidopsis. AU - Honda, Kenji. AU - Yamada, Naotaka. AU - Yoshida, Riichiro. AU - Ihara, Hideshi. AU - Sawa, Tomohiro. AU - Akaike, Takaaki. AU - Iwai, Sumio. PY - 2015/1/1. Y1 - 2015/1/1. N2 - Plants are exposed to hydrogen sulfide (H2S) both exogenously, as it exists as a pollutant gas in the environment, and endogenously, as it is synthesized in cells. H2S has recently been found to function as a gaseous signaling molecule, but its signaling cascade remains unknown. Here, we examined H2S-mediated guard cell signaling in Arabidopsis. The H2S donor GYY4137 (morpholin-4-ium-4-methoxyphenyl [morpholino] phosphinodithioate) induced stomatal closure, which peaked after 150 min at 1 μM or after 90 min at 10 and 100 μM. After reaching maximal closure, stomatal apertures gradually increased in size in response to further exposure to GYY4137. GYY4137 induced nitric oxide (NO) generation in guard cells, and ...
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Fast production decline is a well-known negative phenomenon after some hydraulic fracturing jobs. Reasonably, it is usually attributed to the fracture and reservoir parameters. One of the potential fracture parameters that might contribute to the production decline is conductivity of the proppant pack; this conductivity can be damaged by poor proppant condition. In this study, we investigate the influence of hydrogen sulfide (H2S) on the proppant conditions and performance.. The experimental study assessed the influence of H2S on proppant properties. The study analyzed not only the crush strength and sieve size alterations after exposure of proppant to high H2S content, but also the changes in proppant pack conductivity. Because the proppant pack conductivity is directly related to fluid flow within the fracture, this parameter should be considered as a key parameter for estimation of H2S influence on proppant pack performance.. According to test results, no significant influence of the H2S was ...
Hydrogen sulfide (H2S) is synthesized by 2 enzymes, cystathionine beta-synthase (CBS) and cystathionine gamma-lyase (CSE). L-Cysteine (L-Cys) acts as a natural substrate for the synthesis of H2S. Human penile tissue possesses both CBS and CSE, and tissue homogenates efficiently convert L-Cys to H2S. CBS and CSE are localized in the muscular trabeculae and the smooth-muscle component of the penile artery, whereas CSE but not CBS is also expressed in peripheral nerves. Exogenous H2S [sodium hydrogen sulfide (NaHS)] or L-Cys causes a concentration-dependent relaxation of strips of human corpus cavernosum. L-Cys relaxation is inhibited by the CBS inhibitor, aminoxyacetic acid (AOAA). Electrical field stimulation of human penile tissue, under resting conditions, causes an increase in tension that is significantly potentiated by either propargylglycine (PAG; CSE inhibitor) or AOAA. In rats, NaHS and L-Cys promote penile erection, and the response to L-Cys is blocked by PAG. Our data demonstrate that ...
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A diverse range of effects of the intestinal microbiota on mucosal defence and injury has become increasingly clear over the past decade. Hydrogen sulfide (H2S) has emerged as an important mediator of many physiological functions, including gastrointestinal mucosal defence and repair. Hydrogen sulfide is produced gastrointestinal tract tissues and by bacteria residing within the gut, and can influence the function of a wide range of cells. The microbiota also appears to be an important target of hydrogen sulfide. H2S donors can modify the gut microbiota and the gastrointestinal epithelium is a major site of oxidation of microbial-derived H2S. When administered together with nonsteroidal anti-inflammatory drugs, H2S can prevent some of the dysbiosis those drugs induce, possibly contributing to the observed prevention of gastrointestinal damage. Exogenous H2S can also markedly reduce the severity of experimental colitis and plays important roles in modulating epithelial cell-mucus-bacterial ...
Background: Monocyte signaling is a dominant and important mediator of arteriogenesis activity and monocyte-signaling responses can be severely impaired during arteriogenesis in various vascular disorders. Hydrogen sulfide (H2S) is produced by cystathionine-γ lyase (CSE), and a potential gasotransmitter that has many positive cardiovascular effects including regulation of monocyte functions. However, molecular mechanisms of monocyte specific H2S regulation of arteriogenesis remain completely unknown.. Hypothesis: Monocyte specific H2S production modulates arteriogenesis during hind limb ischemia via a CSE/H2S/IL-16/bFGF dependent pathway.. Methods: Unilateral hind limb ischemia was induced in WT and CSE-/- mice. Mice were then randomly assigned into 4 groups (8 mice, each group); WT PBS, WT DATS (a hydrogen sulfide donor, 200 μg/kg bid., IV until day 21), CSE-/- PBS, CSE-/- DATS. Monocyte expression and activity of CSE and H2S levels was determined in ischemic conditions both in vitro and in ...
A water heater can provide an ideal environment for the conversion of sulfate to hydrogen sulfide gas. The water heater can produce hydrogen sulfide gas in two ways - creating a warm environment where sulfur bacteria can live, and sustaining a reaction between sulfate in the water and the water heater anode. A water heater usually contains a metal rod called an anode, which is installed to reduce corrosion of the water heater tank. The anode is usually made of magnesium metal, which can supply electrons that aid in the conversion of sulfate to hydrogen sulfide gas. The anode is 1/2 to 3/4 inches in diameter and 30 to 40 inches long. ...
Hydrogen sulfide is a highly toxic and flammable gas. Being heavier than air, it tends to accumulate at the bottom of poorly ventilated spaces. Although very pungent at first, it quickly deadens the sense of smell, so potential victims may be unaware of its presence until it is too late.. Hydrogen sulfide is considered a broad-spectrum poison, meaning that it can poison several different systems in the body, although the nervous system is most affected. The toxicity of H2S is comparable with that of hydrogen cyanide. It forms a complex bond with iron in the mitochondrial cytochrome enzymes, thereby blocking oxygen from binding and stopping cellular respiration. Since hydrogen sulfide occurs naturally in the environment and the gut, enzymes exist in the body capable of detoxifying it by oxidation to (harmless) sulfate.[6] Hence, low levels of sulfide may be tolerated indefinitely. However, at some threshold level, the oxidative enzymes will be overwhelmed. This threshold level is believed to ...
TY - JOUR. T1 - Interaction of methylglyoxal and hydrogen sulfide in rat vascular smooth muscle cells. AU - Chang, Tuanjie. AU - Untereiner, Ashley. AU - Liu, Jianghai. AU - Wu, Lingyun. PY - 2010/5/1. Y1 - 2010/5/1. N2 - Hydrogen sulfide (H2S) is a gasotransmitter with multifaceted physiological functions, including the regulation of glucose metabolism. Methylglyoxal (MG) is an intermediate of glucose metabolism and plays an important role in the pathogenesis of insulin resistance syndromes. In the present study, we investigated the effect of MG on H2S synthesis and the interaction between these two endogenous substances. In cultured vascular smooth muscle cells (VSMCs), MG (10, 30, and 50μM) significantly decreased cellular H2S levels in a concentration-dependent manner, while H 2S donor, NaHS (30, 60, and 90μM), significantly decreased cellular MG levels. The expression level and activity of H2S- producing enzyme, cystathionine γ-lyase (CSE), were significantly decreased by MG treatment. ...
TY - JOUR. T1 - Hydrogen sulfide is a partially redox-independent activator of the human jejunum Na+ channel, NAv1.5. AU - Strege, Peter R.. AU - Bernard, Cheryl E.. AU - Kraichely, Robert E.. AU - Mazzone, Amelia. AU - Sha, Lei. AU - Beyder, Arthur. AU - Gibbons, Simon J.. AU - Linden, David R.. AU - Kendrick, Michael L.. AU - Sarr, Michael G.. AU - Szurszewski, Joseph H.. AU - Farrugia, Gianrico. PY - 2011/6/1. Y1 - 2011/6/1. N2 - Hydrogen sulfide (H2S) is produced endogenously by L-cysteine metabolism. H2S modulates several ion channels with an unclear mechanism of action. A possible mechanism is through reduction-oxidation reactions attributable to the redox potential of the sulfur moiety. The aims of this study were to determine the effects of the H2S donor NaHS on Nav1.5, a voltage-dependent sodium channel expressed in the gastrointestinal tract in human jejunum smooth muscle cells and interstitial cells of Cajal, and to elucidate whether H2S acts on Nav1.5 by redox reactions. Whole cell ...
Hydrogen sulphide or H2S is responsible for the characteristic sulphur smell of Rotorua.. There has long been medical and scientific debate about the health impacts of H2S gas in the workplace and residential areas, and this study is the largest ever of associations between ambient H2S and respiratory health. Concentrations of toxic hydrogen sulphide gas can be produced in factories as a by-product of industrial processes, as well as naturally in volcanic and geothermal regions like Rotorua.. The five year study examined a variety of health effects, including asthma, amongst over 1600 adult Rotorua residents. With a population of nearly 60,000, Rotorua is the largest centre anywhere with long term exposure to hydrogen sulphide and is recognised as an ideal place to research the health effects of H2S.. Exposure to H2S was estimated from measurements taken around Rotorua in summer and winter, and then each persons exposure was estimated from where they lived and worked. H2S exposure was divided ...
The specific rates of absorption of hydrogen sulfide in aqueous solutions of iodides, containing dissolved iodine, were measured in a 55 mm i.d. stirred cell, with batch and semi-batch modes of operation. The specific rates of absorption exceeded the rates that may be realised in the instantaneous reaction regime by factors as high as 8. This effect appears to be due to the precipitating (product) colloidal sulfur transporting dissolved hydrogen sulfide, through strong interaction, from near the gas-liquid interface into the bulk liquid. The relative values of the enhancement factor due to precipitated sulfur decrease with an increase in the concentration of dissolved iodine. A two-parameter model, incorporating the uptake of hydrogen sulfide by sulfur and the agglomeration of sulfur particles, has been developed which provides a reasonable framework to correlate the experimental data. ...
Hydrogen sulfide is an extremely dangerous gas that naturally occurs in and around oil and natural gas wells. Removing it from the wellhead is essential to the safety of workers around the jobsite.. Arclin has engineered a triazine-based hydrogen sulfide scavenger that interacts with hydrogen sulfide gases to form a nonvolatile compound that can be removed from the job site safely and easily. And Arclins H2S scavenger contains no measurable free formaldehyde.. ...
S-Propargyl-Cysteine, a Novel Hydrogen Sulfide Donor, Inhibits Inflammatory Hepcidin and Relieves Anemia of Inflammation by Inhibiting IL-6-STAT3 Pathway. . Biblioteca virtual para leer y descargar libros, documentos, trabajos y tesis universitarias en PDF. Material universiario, documentación y tareas realizadas por universitarios en nuestra biblioteca. Para descargar gratis y para leer online.
The report presented here provides a detailed and an accurate account of each aspect of the global Liquid Sodium Hydrosulfide market to help players to better face market challenges and gain a competitive edge over other market participants.
UAB Public Health Specialist, Dr. Lisa McCormick said the vapors from sodium hydrosulfide can be toxic and irritating to your respiratory system and can cause burns to your skin and eyes.
TY - JOUR. T1 - Hydrogen sulfide anion regulates redox signaling via electrophile sulfhydration. AU - Nishida, Motohiro. AU - Sawa, Tomohiro. AU - Kitajima, Naoyuki. AU - Ono, Katsuhiko. AU - Inoue, Hirofumi. AU - Ihara, Hideshi. AU - Motohashi, Hozumi. AU - Yamamoto, Masayuki. AU - Suematsu, Makoto. AU - Kurose, Hitoshi. AU - Van Der Vliet, Albert. AU - Freeman, Bruce A.. AU - Shibata, Takahiro. AU - Uchida, Koji. AU - Kumagai, Yoshito. AU - Akaike, Takaaki. N1 - Funding Information: We thank J.B. Gandy for her editing of the manuscript. Thanks are also due to T. Okamoto, S. Fujii, Md. M. Rahaman, S. Khan, K.A. Ahmed, J. Yoshitake, T. Matsunaga, M.H.A. Rahman, J. Sakamoto, J. Minkyung, K. Hara, M. Goto, F. Sohma, K. Taguchi, T. Miura, T. Toyama, Y. Shinkai, I. Ishii and M. Toyataka for technical assistance; S. Kasamatsu, T. Ida and K. Kunieda for 8-nitro-cGMP preparation; Y. Kawai for technical assistance with LC/MS/MS experiments; H. Arimoto for helpful discussion; and J. Wu for reading our ...
In a new study, the reseachers, including Raj Kishore, PhD, are the first to show in diabetic animals that induced hydrogen sulfide production in bone marrow stem cells can effectively repair vessel tone and limb circulation.
299548993 - EP 0731068 B1 2001-05-23 - Process for binding ammonia and/or hydrogen sulphide in manure - [origin: EP0731068A2] Binding ammonia and/or hydrogen sulphide in liquids, esp. farmyard slurry, comprises mixing with a solid or liq. additive (A) contg. at least two carboxylic acids. Also claimed are: (A); and the NH3 and/or H2S-contg. liq. which also contains carboxylic acids from the addn. of (A). Pref. the compsn. contains at least one Fe cpd. (esp. FeSO4) and at least one 1-6C (esp. 4-6C) aliphatic mono- or di- carboxylic acid. The wt. ratio of carboxylic acids to Fe cpd. is 15:1 to 1:15. The amt. added is sufficient to lower the pH of the liq. by at least 0.2.[origin: EP0731068A2] Binding ammonia and/or hydrogen sulphide in liquids, esp. farmyard slurry, comprises mixing with a solid or liq. additive (A) contg. at least two carboxylic acids. Also claimed are: (A); and the NH3 and/or H2S-contg. liq. which also contains carboxylic acids from the addn. of (A). Pref. the compsn. contains at least
Hydrogen sulfide (H2S) is protective in myocardial ischemia/reperfusion injury (I/R). However, venous injection of NaHS and local injection of adenovirus with cystathionine-γ-lyase (CSE) plasmids was used to increase H2S concentration presented low-efficiency and side-eff...
Hydrogen sulfide (or hydrogen sulphide) is the chemical compound with the formula H2S. This colorless, toxic and flammable gas is partially responsible for the foul odor of rotten eggs and flatulence. It often results from the bacterial break down of sulfates in organic matter in the absence of oxygen, such as in swamps and sewers (anaerobic digestion). It also occurs in volcanic gases, natural gas and some well waters. The odor of H2S is commonly misattributed to elemental sulfur, which is in fact odorless. Hydrogen sulfide has numerous names, some of which are archaic ...
The changes in neurotransmitters biosynthesis in the cerebrum of Coq9R239X mice are not limited to the reduction in L‐glutamate but also to the biosynthesis of serotonin and catecholamines. These alterations might be a consequence of the disruption in hydrogen sulfide metabolism because a dose‐dependent and time‐dependent decrease in glutamate levels and increase in serotonin levels have been described in the cerebrum and frontal cortex of rats chronically exposed to 20 ppm and 75 ppm of hydrogen sulfide (Skrajny et al, 1992; Roth et al, 1995). The same authors reported a decrease in the levels of norepinephrine with the exposure to 20 ppm of hydrogen sulfide and an increase in those levels with the exposure to 75 ppm of hydrogen sulfide (Skrajny et al, 1992). Norepinephrine and epinephrine levels were, however, decreased in isolated porcine iris‐ciliary body exposed to increased concentrations of NaSH, which is a commonly used hydrogen sulfide donor (Kulkarni et al, 2009). The changes ...
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Purpose: Hydrogen Sulfide (H2S) is an endogenous gasotransmitter that has vasodilatory properties. It may be a novel therapy for intestinal I/R. We hypothesized that: 1) H2S would improve post-ischemic survival, mesenteric perfusion, mucosal injury, and inflammation compared to vehicle, and 2) the benefits of H2S would be mediated through endothelial nitric oxide. Methods: C57Bl6J wild type (WT) and endothelial nitric oxide synthase knock out (eNOS KO) mice were anesthetized and a midline laparotomy performed. Intestines were eviscerated, the small bowel mesenteric root identified, and baseline intestinal perfusion determined using Laser Doppler. Intestinal ischemia was established by temporarily occluding the superior mesenteric artery. Following ischemia, the clamp was removed and the intestines were allowed to recover. Sodium hydrosulfide (NaHS) in 250µl of PBS or the vehicle was injected into the peritoneum. Animals were allowed to recover and were assessed for survival, mesenteric ...
This newly developed program meets the academic training requirements for those persons who work in an area with potential hydrogen sulfide exposures. Program explains new TLV and other important safety rules relating to hydrogen sulfide.
Abstract: 本文旨在观察外源性硫化氢(hydrogen sulfide,H2S)供体NaHS预处理对大鼠胃缺血再灌注(gastric ischemia-reperfusion,GI-R)损伤的影响及其可能的作用机制。实验分5组:假手术(sham)组、GI-R组、NaHS组、格列苯脲(glibenclamide)组和吡那地尔(pinacidil)组。采用夹闭雄性Sprague-Dawley(SD)大鼠腹腔动脉30min再灌注1h,建立GI-R损伤模型。采用Adobe ...
Aims: To investigate the role of endogenous hydrogen sulfide (H2S) in the control of aging and healthspan of Caenorhabditis elegans. Results: We show that the model organism, C. elegans, synthesizes H2S. Three H2S-synthesizing enzymes are present in C. elegans, namely cystathionine γ lyase (CSE), cystathionine β synthetase, and 3-mercaptopyruvate transferase (MPST or 3-MST). Genetic deficiency of mpst-1 (3-MST orthologue 1), but not cth-2 (CSE orthologue), reduced the lifespan of C. elegans. This effect was reversed by a pharmacological H2S donor (GYY4137). GYY4137 also reduced detrimental age-dependent changes in a range of physiological indices, including pharyngeal contraction and defecation. Treatment of C. elegans with GYY4137 increased the expression of several age-related, stress response, and antioxidant genes, whereas MitoSOX Red fluorescence, indicative of reactive oxygen species generation, was increased in mpst-1 knockouts and decreased by GYY4137 treatment. GYY4137 additionally ...
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Cardiovascular morbidity and mortality is high in CKD patients. Nitric oxide (NO) deficiency plays a crucial role in progression of CKD. This leads to endothelial dysfunction, hypertension, and inflammation. Hydrogen sulfide (H2S) could serve as a backup mechanism for NO deficiency in CKD. N-acetylcysteine (NAC) is a derivate of cysteine and this is the main substrate for H2S production. Therefore, NAC should enable us to stimulate H2S production in humans. Our objective is to investigate the effect of NAC on plasma H2S levels and on markers of oxidative stress, inflammation, and endothelial dysfunction in healthy volunteers, CKD patients, and dialysis patients. We hypothesize that there is an increase in H2S levels after treatment with NAC ...
We previously reported that the endogenous cystathionine gamma-lyase (CSE)/hydrogen sulfide (H(2)S) pathway is implicated in the pathogenesis of bleomycin-induced pulmonary fibrosis in rats, but the exact cellular mechanisms are not well characterized. Epithelial-mesenchymal transition (EMT), induced by transforming growth factor beta 1 (TGF-beta 1) in alveolar epithelial cells, plays an important role in the pathogenesis of pulmonary fibrosis. We studied whether H(2)S could attenuate EMT in cultured alveolar epithelial cells and TGF-beta 1 treatment suppressed CSE expression in A549 cells. Inhibition of endogenous CSE by DL-propargylglycine led to spontaneous EMT, as manifested by decreased E-cadherin level, increased vimentin expression and fibroblast-like morphologic features. Exogenous H(2)S applied to TGF-beta 1-treated A549 cells decreased vimentin expression, increased E-cadherin level and retained epithelial morphologic features. In addition, preincubation with H(2)S decreased Smad2/3 ...
Hydrogen Sulfide Gas. Describe H 2 S gas and where it is found:. Hydrogen Sulfide is a highly toxic gas often associated with operations involving decomposing organic material (rotting plant and animal tissues). Slideshow 6763227 by socorro-xovi
TY - JOUR. T1 - Hydrogen sulphide induces angiogenesis. AU - Pyriochou, Anastasia. AU - Marazioti, Antonia. AU - Szabo, Csaba. AU - Papapetropoulos, Andreas. PY - 2009. Y1 - 2009. N2 - Hydrogen sulphide (H2S) is emerging as an important signalling molecule in the cardiovascular and neuronal systems. Although H2S is known to relax vascular smooth muscle leading to a reduction in blood pressure, the role of this gaseous mediator in other aspects of the biology of vascular cells remains largely unexplored. In order to study the effects of H2S on neovascularisation, we have utilised an aqueous formulation of H2S. Incubation of endothelial cells (EC) with H2S enhanced their angiogenic potential as it promoted cell growth, migration and capillary morphogenesis on matrigel. In line with the in vitro observations, treatment of chicken chorioallantoic membranes (CAM) with H2S increased vascular length. Morever, exposure of EC to H2S resulted in increased phosphorylation of kinases linked to angiogenic ...
Appearing during the first three hours, Prof. Peter Ward, the author of Under a Green Sky, discussed his latest work on hydrogen sulfide extinctions, and how we are creating the circumstances for extinctions in the future. His research has connected past mass extinctions and global warming. Greenhouse gases and the melting of the ice-caps could create a dangerous situation where the ocean currents stop circulating. The stagnation of the oceans waters would lead to the thriving of a type of bacteria that produces hydrogen sulfide. Killing off life in the ocean and sending toxic gases into the atmosphere, hydrogen sulfide could actually turn the sky green, he noted. The coast off of Namibia is a hydrogen sulfide hot spot and the eruptions can be seen in this NASA satellite photo. Curiously, it has been found that hydrogen sulfide can have startling medical benefits, putting injured people into a kind of suspended animation until they can be treated. For more on hydrogen sul
This paper discusses hydrogen sulfide limits for various states that have recently updated their limits or whose limits demonstrate a distinction between health and odor-based limits. Odor discussions often focus on hydrogen sulfide because it has a low odor threshold and it is easily detected and recognized. There is a widely held public opinion that if odors are apparent, whether from wastewater processes, landfill gas emissions, or other sources, that these odors are a health concern. The differences between health and welfare/nuisance concerns and how emission limits are established is presented. Although some states base their emission limits on health concerns and some base the limits on welfare concerns, from the publics perspective both types of limits are often considered to be health-based ...
Hydrogen sulfide (H2S), a well-known poisonous gas, has been recognized as a critical endogenous gas transmitter in the past decade. To provide a quick and efficient detection method for hydrogen sulfide, a novel fluorescent probe DCI-NCN was designed based on an isophoronitrile scaffold featured with the cyanoxy g
Tungsten carboxylate compounds useful for coating interdigitated electrodes used in hydrogen sulfide gas sensors are disclosed. A method of coating electrodes with the compounds using a precise solution casting technique such as spin-coating or casting, dip-casting or spray-casting techniques is also described. Electrodes which are solution coated with the compounds may be used to fabricate superior quality chemiresistor sensors for use in hydrogen sulfide gas sensing devices by heating the carboxylates above 350 C. to decompose certain carboxylates to WO3 and others to sodium tungstate.
CHAPEL HILL, N.C., Sept. 20, 2017 /PRNewswire/ -- Aquagenx Launches New Quantitative Water Quality Test for Hydrogen Sulfide Bacteria. Compartment Bag Test for Hydrogen Sulfide Bacteria Overcomes Limitations of H2S Presence/Absence Tests for Field Level Testing.
The generation of endogenous hydrogen sulphide may either limit or contribute to the degree of tissue injury caused by ischaemia/reperfusion injury. Here, we have attempted to characterise the endogenous hydrogen sulphide synthesis pathway and the effects of sodium hydrosulphide, a hydrogen sulphide donor, in a mouse model of renal ischaemia/reperfusion injury. Anaesthetised male C57/b mice weighing 20-25 g were divided into two groups; (i) Ischaemia/Reperfusion Injury, in which mice were subjected to bilateral renal ischaemia performed by clamping the renal pedicles for 30 min followed by reperfusion for 24 h, (ii) Sham, in which mice were subjected to the same surgical procedures as above, except for renal ischaemia/reperfusion. Western blot analysis of the kidney taken at the end of the experiment demonstrated that cystathionine gamma-lyase, the enzyme responsible for generating hydrogen sulphide in the cardiovascular system, is expressed in the normal kidney and is significantly ...
Hydrogen sulfide (H2S) occurs naturally in crude petroleum, natural gas, volcanic gases, and hot springs. It can also result from bacterial breakdown of organic matter. It is also produced by human and animal wastes. Bacteria found in your mouth and gastrointestinal tract produce hydrogen sulfide from bacteria decomposing materials that contain vegetable or animal proteins. Hydrogen sulfide can also result from industrial activities, such as food processing, coke ovens, kraft paper mills, tanneries, and petroleum refineries. Hydrogen sulfide is a flammable, colorless gas with a characteristic odor of rotten eggs. It is commonly known as hydrosulfuric acid, sewer gas, and stink damp. People can smell it at low levels.
Although previous studies have demonstrated that hydrogen sulfide (H2S) stimulated or inhibited osteoclastic differentiation, little is known about the effects of H2S on the differentiation of osteoblasts and osteoclasts. To determine the possible bioactivities of H2S on bone metabolism, we investigated the in vitro effects of H2S on cytotoxicity, osteoblastic, and osteoclastic differentiation as well as the underlying mechanism in lipopolysaccharide (LPS) and nicotine-stimulated human periodontal ligament cells (hPDLCs). The H2S donor, NaHS, protected hPDLCs from nicotine and LPS-induced cytotoxicity and recovered nicotine- and LPS-downregulated osteoblastic differentiation, such as alkaline phosphatase (ALP) activity, mRNA expression of osteoblasts, including ALP, osteopontin (OPN), and osteocalcin (OCN), and mineralized nodule formation. Concomitantly, NaHS inhibited the differentiation of tartrate-resistant acid phosphatase (TRAP)-positive osteoclasts in mouse bone marrow cells and blocked ...
Hydrogen sulfide occurs naturally and is also produced by human activities. Just a few breaths of air containing high levels of hydrogen sulfide gas can cause death. Lower, longer-term exposure can cause eye irritation, headache, and fatigue. This substance has been found in at least 24 of the 1,467 National Priorities List sites identified by the Environmental Protection Agency (EPA).
Because hydrogen sulfide is such a common contaminant in methane, natural gas processors could potentially use this method in the sweetening process, reducing their energy use and saving money on the cost of sorbent materials, said Phillip Koech, lead author and senior research scientist.. In the new work, Koech and colleagues tested how well they could swing hydrogen sulfide through a series of processing liquids without using water or heat. They began with a substance known as a recyclable binding organic liquid that could hold onto hydrogen sulfide without the addition of water. First, they dissolved hydrogen sulfide in several different recyclable binding organic liquids and found that nearly all of them could hold the chemical without added water. They found one -- DMEA -- that could hold the most hydrogen sulfide. A chemical analysis suggested that hydrogen sulfide forms a salt with DMEA, turning the DMEA from an oily liquid into something more like salty water, but not water at ...
Hypoxia, anoxia and free hydrogen sulphide in the water column are characteristic of the inner shelf coastal upwelling system off central Namibia. Biogeochemical monitoring of the diatomaceous sediments along the central coast over a 3-year period, coupled with acoustic studies and ROV video coverage, indicated a major role played by the seafloor in the generation and control of H2S into the water column. We determined the sedimentary processes resulting in the generation and dispersal of hydrogen sulphide, and its effect on some of the locally important fishes and invertebrates.. Marked interannual variability with no obvious seasonal trends was apparent in methane contents of sediments even over the short three-year period, whilst sulphate reduction rates in the sediment showed little change. The large sulphur bacteria Thiomargarita namibiensis and Beggiatoa spp. form dense mats over extensive areas of mud and oxidize sulphide at the sediment-water interface, thereby regulating its flux into ...
The study aimed to examine the protective effect of hydrogen sulfide (H2S) on high-salt-induced oxidative stress and myocardial hypertrophy in salt-sensitive (Dahl) rats. Thirty male Dahl rats and 40 SD rats were included in the study. They were randomly divided into Dahl control (Dahl + NS), Dahl high salt (Dahl + HS), Dahl + HS + NaHS, SD + NS, SD + HS, SD + HS + NaHS, and SD + HS + hydroxylamine (HA). Rats in Dahl + NS and SD + NS groups were given chow with 0.5% NaCl and 0.9% normal saline intraperitoneally daily. Myocardial structure, α-myosin heavy chain (α-MHC) and β-myosin heavy chain (β-MHC) expressions were determined. Endogenous myocardial H2S pathway and oxidative stress in myocardial tissues were tested. Myocardial H2S pathway was downregulated with myocardial hypertrophy featured by increased heart weight/body weight and cardiomyocytes cross-sectional area, decreased α-MHC and increased β-MHC expressions in Dahl rats with high-salt diet (all P P P 2S reduced myocardial hypertrophy
Hydrogen sulfide baths are usually used in the form of classical baths, half-baths, irrigation, inhalations, ascending shower. Before taking such baths, it is necessary to consult a qualified doctor who will determine what type of balneotherapy and what concentration of hydrogen sulfide you need. Throughout the course of therapy it is necessary to refuse from alcohol intake, smoking, not to overeat, not to allow stress. Taking baths follows out food and active activities. If during balneotherapy you feel unwell, dizzy, nauseous, stop taking the bath immediately and ventilate the room. Contact a specialist and he will give you another dosage of hydrogen sulfide. To date, there is the opportunity to take sulfide baths at home. To do this, it is enough to buy a special drug in the pharmacy and, after consulting a doctor, dilute it in the right proportion. When specifying the course of treatment with Matsestas waters, the concentration of hydrogen sulfide is indicated. For reception of the general ...
An electron microscope image shows carbon black nanoparticles modified by adding polyvinyl alcohol for downhole detection of hydrogen sulfide in oil and gas wells. The nanoreporters were created at Rice University. (Credit: Tour Group/Rice University). Scientists at Rice University have created a nanoscale detector that checks for and reports on the presence of hydrogen sulfide in crude oil and natural gas while theyre still in the ground. The nanoreporter is based on nanometer-sized carbon material developed by a consortium of Rice labs led by chemist James Tour. Limited exposure to hydrogen sulfide causes sore throats, shortness of breath and dizziness, according to the researchers. The human nose quickly becomes desensitized to hydrogen sulfide, leading to an inability to detect higher concentrations. That can be fatal, they said. On the flip side, hydrogen sulfide is also a biologically important signaling molecule in processes that include pain and inflammation. Tour said chemists have ...
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Scientists from the Max Planck Institute have shown how sunken wood can develop into attractive habitats for a variety of microorganisms and invertebrates due to the activity of bacteria, which produce hydrogen sulfide during wood degradation.. Trees do not grow in the deep sea, nevertheless sunken pieces of wood can develop into oases for deep-sea life - at least temporarily until the wood is fully degraded. A team of Max Planck researchers from Germany now showed how sunken wood can develop into attractive habitats for a variety of microorganisms and invertebrates. By using underwater robot technology, they confirmed their hypothesis that animals from hot and cold seeps would be attracted to the wood due to the activity of bacteria, which produce hydrogen sulfide during wood degradation.. Many of the animals thriving at hydrothermal vents and cold seeps require special forms of energy such as methane and hydrogen sulfide emerging from the ocean floor. They carry bacterial symbionts in their ...
Purchase Hydrogen Sulfide, Deuterium Sulfide & Hydrogen Selenide, Volume 32 - 1st Edition. Print Book & E-Book. ISBN 9780080324814, 9781483286396
Sigma-Aldrich offers abstracts and full-text articles by [Hongzhu Li, Chao Zhang, Weiming Sun, Lina Li, Bo Wu, Shuzhi Bai, Hongxia Li, Xin Zhong, Rui Wang, Lingyun Wu, Changqing Xu].
Ammonium sulfide (also called diammonium sulfide, ammonium monosulfide, true ammonium sulfide) is a yellow crystalline solid, usually in a water solution, with the molecular formula H8N2S. It has a very strong rotten egg and ammonia odor. Ammonium sulphide is produced from the reaction of hydrogen sulfide with excess amounts of ammonia.. Ammonium sulfide is used in photographic developing, to apply patina to bronze, in textile manufacturing, and in trace metal analysis. Also, owing to its offensive smell, it is the active ingredient in a variety of foul pranks including the common stink bomb.. Additional applications of this compound include cell culture, organic chemical synthesis, and immunohistochemistry.. Aqueous ammonium sulfide is used for the thiolysis of activated amides to their corresponding thioamides, as an alternative to hydrogen sulfide. Also it is used to produce various flavor compounds from the reaction of ammonium sulfide with 3-hydroxy-2-butanone.. Ammonium sulfide can be ...
Before the rise in atmospheric oxygen (O2) levels ∼800 million years ago, oceans were euxinic; that is, both anoxic and sulfidic. The rise in O2 was associated with an increased abundance of cyanobacteria and plants that are thought to have eliminated sulphide, which was an abundant energy source (Olson and Straub, 2016). Eventually, organisms adapted mechanisms that used O2 to harvest energy and support cellular processes. However, hydrogen sulfide (H2S) still retained an important role in cellular function, serving as an important signaling molecule. Indeed, the pathway for H2S regulation is highly conserved across modern taxa (Olson and Straub, 2016).. Modern environments that have high H2S levels are primarily limited to deep-sea hydrothermal vents (Olson and Straub, 2016), where levels can be 3-110 mmol kg−1. Cold seeps and freshwater springs and caves fed by H2S-enriched groundwater have been found with levels of H2S up to 1200 µM (Tobler et al., 2011). These habitats are ...
Arecoline is a major alkaloid of areca nut and has been effect on central nervous system. Although arecoline-induced neurotoxicity has been reported, the possible underlying neurotoxic mechanisms have not yet been elucidated. Increasing evidences have shown that both excessive endoplasmic reticulum (ER) stress and disturbance of hydrogen sulfide (H2S) production are involved in the pathophysiology of numerous neurodegenerative diseases. Here, the purpose of present study was to verify whether ER stress and the disturbance of endogenous H2S generation are also involved in arecoline-caused neurotoxicity. We found that treatment of PC12 cells with arecoline induced the down-regulation of cells viability and up-regulation of apoptosis and the activity of caspase-3, indicating the neurotoxic role of arecoline to PC12 cells. In addition, arecoline also increased the expression of Bax (pro-apoptotic protein) and attenuated the expression of Bcl-2 (anti-apoptotic protein) in PC12 cells. Simultaneously,
Product number: NCM0140. Lysine Iron Agar is used for the differentiation of microorganisms on the basis of lysine decarboxylase and hydrogen sulfide production. Lysine Iron Agar is not intended for use in the diagnosis of disease or other conditions in humans.. Lysine Iron Agar is prepared according to the formulation of Edwards and Fife, who developed the medium to detect Salmonella arizonae. S. arizonae ferments lactose rapidly, and the authors found expected H2S production on Triple Sugar Iron Agar was suppressed. Detection of S. arizonae is important because it has been implicated in food borne infections. By eliminating lactose and incorporating lysine, Edwards and Fife devised a medium differentiating enteric bacilli based on their ability to decarboxylate or deaminate lysine and produce abundant hydrogen sulfide. This medium is recommended for detecting rapid lactose-fermenting S. arizonae.. ...
Hydrogen sulfide (H,sub,2,/sub,S), a malodorous gas with the characteristic odor of rotten eggs, has been recognized as an important endogenous gaseous signaling molecule of the cardiovascular, gastrointestinal, genitourinary, and nervous systems. Besides acting as a potent vasodilator and an atypical neuromodulator, H,sub,2,/sub,S is increasingly being established as a novel mediator of inflammation. However, the part played by H,sub,2,/sub,S in modulating neurogenic inflammatory response in sepsis is not known. Therefore, this study aimed to investigate the role of H,sub,2,/sub,S in mediating neurogenic inflammation in a mouse model of polymicrobial sepsis induced by cecal ligation and puncture (CLP). Of major significance in the development of neurogenic inflammation is the transient receptor potential vanilloid type 1 (TRPV1) receptor, a non-selective cation channel found predominantly in primary sensory neurons. In particular, the results of the present study indicate that H,sub,2,/sub,S ...
CG-Q34-4JK - BW Equivalent Calibration Gas 1.25% methane(50% LEL pentane equiv.), 18% oxygen, 25 ppm hydrogen sulfide, 100 ppm carbon monoxide Balance nitrogen 34L Liter cylinder (Made by Gasco)
4594944 - Calibration Gas Hydrogen Sulfide 25ppm, Carbon Monoxide 100ppm, Pentane 30% LEL, Oxygen 20.9% Balance Nitrogen Size 58 Liter GAL C-10 Inlet Cylinder (Made by Portagas)
Z105310MX49 - Norlab Equivalent Calibration Gas 25 ppm Hydrogen Sulfide, Pentane 30% LEL, Carbon Monoxide 100 Balance air 58L Liter cylinder (Made by Gasco)
Animal waste is considered to be a significant source of potentially hazardous and odorous emissions. Emissions associated with swine manure consist of gases such as ammonia (NH3), hydrogen sulfide (H2S), greenhouse gases (GHGs) and volatile organic compounds (VOCs). Comprehensive, effective, practical, and inexpensive treatment is in high demand. Biochar is mainly known for being soil amendment, has been used for remediation of heavy metals from wastewater, and as an adsorbent for gases due to its porosity. Thus, it is proposed that biochar could be used as an effective and practical treatment for gaseous emissions from stored manure. Data is needed on the performance of biochar to mitigate gaseous emissions from swine manure including simple floatation tests. The hypothesis of mechanism how biochar mitigates emissions from swine manure is that it can influence manure pH, and by that inhibit gaseous emissions transfer from liquid to air, by, for instance, preventing NH4+ transformation to gaseous NH3.
he presence of hydrogen sulfide (H2S) and ammonia (NH3) in biogas pose serious human health and environmental challenges. In this study, H2S and NH3 were successfully removed from biogas using water hyacinth-derived carbon (WHC) nanomaterials. Carbonization temperature, biogas flow rate, mass of the adsorbent and activating agent (KOH/water hyacinth (WH)) ratio were found to greatly influence the efficiency of the H2S and NH3 removal. The adsorption capacity of both H2S and NH3 was found to increase with the carbonization temperature as carbon materials prepared at 450, 550, and 650°C afforded removal efficiencies of 22, 30, and 51% for H2S and 42, 50, and 74% for NH3, respectively, after contact time of 2 h. Similarly, the KOH/WHC ratio showed huge impact on the adsorptive removal of the two species. WH materials carbonized at 650°C and activated at 700°C using 1:4, 1:2, and 1:1 KOH/WHC ratios showed removal efficiencies of 80, 84, and 93% for H2S and 100, 100, and 100% for NH3, ...
Search and download thousands of Swedish university dissertations (essays). Full text. Free. Dissertation: Importance of bacterial hydrogen sulfide in the pathogenesis of periodontal diseases.
The point-of-entry FI-CHLORAMINE10-BB water filters utilize advanced catalytic granular activated carbon which effectively remove chloramine and hydrogen sulfide from the water and treat up to 8,000 gallons of water.
List of Hydrogen Sulfide companies, manufacturers and suppliers for the University / Academia / Research industry serving Marshall Islands on Environmental XPRT
List of Hydrogen Sulfide companies, manufacturers and suppliers for the Water and Wastewater industry serving Marshall Islands on Environmental XPRT
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Why Protein Makes Your Farts Stink:. The main reason why protein causes gas is because it contains amino acids which are known to produce hydrogen sulfide. Hydrogen sulfide smells worse than normal stinkiness.. You may have heard that eating rotten eggs will make your stinky breath smell better. However, there is no evidence that eating rotten egg will cure your flatulence problem.. Hydrogen sulfide is a natural odorant that occurs naturally in the body. Its produced when certain amino acids react with sulfur compounds found in our air.. These reactions occur when we eat foods containing these amino acids. When we digest food, these amino acid residues are broken down into smaller pieces called peptides (small chains). These small peptides then bond together to form larger molecules like proteins and other complex molecules such as fats and sugars. Some of these bonds are made stronger than others. For example, some amino acids bind strongly to one another while others dont. If you eat a steak ...
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The teleost brain is an energetically costly organ, which raises the question of how brain anatomy is shaped by divergent ecological factors in contrasting (extreme/resource-limited vs. benign) environments. A previous study compared different ecotypes of the teleost Poecilia mexicana in the Tacotalpa drainage system and found that cave fish had a smaller eye diameter, a smaller optic tectum and larger telencephalic lobes relative to ancestral surface-dwelling fish. Smaller eyes and a smaller optic tectum but larger telencephalic lobes were also found in fish from a sulphidic surface habitat near one of the caves, which the authors hypothesized to result from limited vision in turbid sulphide waters. In this study, we tested if repeated transitions along a replicated, natural toxicity gradient result in repeated (convergent) anatomical changes of the teleost brain. We compared ecotypes in the P. mexicana species complex that have independently evolved increased tolerance to hydrogen sulphide ...
Electrical and electronic equipment and components that are used in adverse work environments, e.g. the oil and gas industry, waste water treatment plants, and the pulp and paper industry, where corrosive gases such as hydrogen sulphide are found cause severe corrosion and the rapid deterioration of the electronic components and equipment, including connectors and switches used in these and other work environments. One economical way to prevent or inhibit corrosion from destroying electronics and electrical components is to use CORR-EX LCP-177, ultra thin-film, water-displacing, lubricant and corrosion-inhibiting compound.. ...
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0055]The vapor stream 36 from product separator 34 contains the gaseous portion of the isomerization effluent which comprises at least hydrogen, carbon monoxide, hydrogen sulfide, carbon dioxide and propane and is directed to a system of amine absorbers to separate carbon dioxide and hydrogen sulfide from the vapor stream. Because of the cost of hydrogen, it is desirable to recycle the hydrogen to deoxygenation reactor 4, but it is not desirable to circulate the carbon dioxide or an excess of sulfur containing components. In order to separate sulfur containing components and carbon dioxide from the hydrogen, vapor stream 36 is passed through a system of at least two amine absorbers, also called scrubbers, starting with the first amine absorber zone 56. The amine chosen to be employed in first amine scrubber 56 is capable of selectively removing at least both the components of interest, carbon dioxide and the sulfur components such as hydrogen sulfide. Suitable amines are available from DOW and ...
Sustainable, low-temperature methods for natural gas activation are critical in addressing current and foreseeable energy and hydrocarbon feedstock needs. Large portions of natural gas resources are still too expensive to process due to their high content of hydrogen sulfide gas (H2S) mixed with methane, deemed altogether as sub-quality or sour gas. We propose a unique method of activation to form a mixture of sulfur-containing hydrocarbon intermediates, CH3SH and CH3SCH3, and an energy carrier such as H2. For this purpose, we investigated the H2S-mediated methane activation to form a reactive CH3SH species by means of direct photolysis of sub-quality natural gas. Photoexcitation of hydrogen sulfide in the CH4+H2S complex resulted in a barrierless relaxation by a conical intersection to form a ground-state CH3SH+H2 complex. The resulting CH3SH could further be coupled over acidic catalysts to form higher hydrocarbons, and the resulting H2 used as a fuel. This process is very different from ...
A process for leaching a value metal from a base metal sulfide ore, comprising the step of leaching the ore with a lixiviant comprising a chloride, an oxidant and hydrochloric acid is disclosed. The leaching is controlled, by use of low concentrations of hydrochloric acid and a redox potential, to effect formation of hydrogen sulfide from the base metal sulfide ore. The hydrogen sulfide is stripped from the leach solution, thereby reducing the amount of sulfate generated in the leach to very low levels. The leaching may also be conducted to limit the co-dissolution of platinum group metals and gold with the base value metals. The leach forms a value metal-rich leachate and a solids residue. The solids residue may be subsequently leached to recover the platinum group metals and gold. The value metal-rich leachate can be is oxidized and neutralized to recover the value base metals. In an embodiment, the chloride is magnesium chloride and lixiviant solution is regenerated.
Note: This is the second major metropolitan area in recorded history to be told to shelter-in-place because of hydrogen sulfide. The first was in late 2012 in coastal Kuwait City (Kuwait), mentioned in the 2012-10-17 update. So something that had never happened before has now happened twice in two years. Add to that all of the other hydrogen sulfide incidents: the stinkfests in Southern California, the rotten egg odor that hit Santa Monica after a naturally-occurring methane release in Santa Monica Bay (but methane is odorless, so it wasnt methane), the rotten egg odor that blew in off the ocean and hit Quincy (Massachusetts), the rotten egg odor that hit the Inner Harbor in coastal Baltimore (Maryland) that killed all the fish, the boating town in Australia thats turning into a ghost town because of hydrogen sulfide blowing in off the ocean, the thousands of people fleeing and puking from toxic gas of unknown origin in coastal Rayong (Thailand), and many, many HazMat events ...
Hydrogen sulfide in a landfill is reduced by dispersing a hydrogen sulfide control agent, such as an iron compound, into the landfill. The hydrogen sulfide control agent may be a component of an injected foam. Gas is also recovered from the landfill by introducing water into the landfill, as part of the foam, to promote digestion of organic matter.
Biosynthesis of L-glutamate from L-aspartate or L-cysteine. Important regulator of levels of glutamate, the major excitatory neurotransmitter of the vertebrate central nervous system. Acts as a scavenger of glutamate in brain neuroprotection. The aspartate aminotransferase activity is involved in hepatic glucose synthesis during development and in adipocyte glyceroneogenesis. Using L-cysteine as substrate, regulates levels of mercaptopyruvate, an important source of hydrogen sulfide. Mercaptopyruvate is converted into H(2)S via the action of 3-mercaptopyruvate sulfurtransferase (3MST). Hydrogen sulfide is an important synaptic modulator and neuroprotectant in the brain. ...
Sodium sulfide nonahydrate, ACS, 98.0% min, Alfa Aesar™ 250g Sodium sulfide nonahydrate, ACS, 98.0% min, Alfa Aesar™ Inorganic Sodium Compounds
A recent study (here) indicates that H2S may play a role in regulating blood flow on the fetal side of human placenta. One of the enzymes that generates H2S (CSE) is found in the smooth muscle layer of stem villus arteries. Moreover it was shown using the H2S donor NaHS that the molecule is able to dilate the fetal placental circulation. Because the placenta lacks innervation, signaling molecules like H2S are likely to be important in the regulation of blood flow. The study found evidence that CSE expression is decreased in pathological pregnancies such as preeclampsia and fetal growth restriction. ...
Osmopriming is a technique in which the seed of different plant species is partially or fully hydrated with water or solutions with different osmotic potentials aiming to intensify physiological processes, what improves and excellerates germination. In our study cucumber seed (Cucumis sativus L.) from three different production years was osmoprimed with 300 μM solutions of two different hydrogen sulphide donors: slowly releasing donor GYY4137 and fast releasing donor NaHS. After imbibition, seed was dried and germinated on filter paper moistened with 25 mM NaCl solution or water, respectively. Main hypothesis was that H2S influences germination and vigour of cucumber seedlings germinated in the presence of salt, and that applied H2S donors (NaHS and GYY4137) will differ significantly in their effect. In treatment with NaHS the oldest seed from production year 2009/2010 had significantly lower standard germination and germination energy, while in treatment with GYY4137 differences among seed ...
Because gasotransmitters are highly conserved in mammals, the findings of the research are believed to have broad applications to human physiology and disease.. In terms of relaxing blood vessels, it looks like hydrogen sulfide might be as important as nitric oxide, Snyder says, referring to the first gasotransmitter that two decades ago was discovered to regulate blood pressure.. Just because these two gas molecules perform similar functions, doesnt mean theyre redundant, says Wang, the papers principal author. Nature has added on layer upon layer of complexity to provide a better and tighter control of body function - in this case, of blood pressure.. Studying gaseous messengers can be tricky, explains Snyder, an authority on nitric oxide (NO) whose lab in 1990 discovered that the enzyme triggering NO production is activated by a protein mechanism known as calcium-calmodulin.. When a nerve fires, it releases a bit of neurotransmitter. Then it fires again, very quickly, and releases ...
Ammonium sulfide, also known as the stink bomb is made up of a solution of ammonium sulfide in water, sealed inside a glass ampoule (a small bottle-like container used to store a liquid securely). When the ampoule is broken, ammonia and hydrogen sulfide gases are released from the solution. These chemicals have a very strong and unpleasant smell. Ammonium sulfide is a very toxic chemical. It is also explosive and highly flammable. It is added to cigarettes. ...
A process for reducing sulfur content in a gaseous stream with the production of elemental sulfur by first treating the gaseous steam with hydrogenation and hydrolysis to convert substantially all of the sulfur components therein to hydrogen sulfide. Then reducing the water content of the gaseous stream to optimize chemical equilibrium. Thereafter, the gaseous steam is contacted in an oxidation reactor with an acid catalyst at a temperature of about 150 C. to about 350 C. to convert hydrogen sulfide to elemental sulfur. The product gas leaving the oxidation reactor is cooled to separate elemental sulfur by condensation. The acid catalyst is a shape selective zeolite, a metal-exchanged or impregnated alumina, or a mixture thereof. The alumina is gamma phase alumina impregnated with from about 0.2 wt % to about 2.0 wt % metal.
There are two basic types of radiation: ionizing and non-ionizing. Examples of non-ionizing radiation include microwaves and electromagnetic fields. Types of ionizing radiation include gamma, beta and x-rays. Radiation therapy treatments involve one or more of these three types of ionizing radiation.. Ionizing radiation cant be detected with any of the five human senses. Because of this, special instruments, such as Geiger counters and ionization chambers, are used to detect radiation and to measure radiation levels. Exposure to radiation doesnt cause people to glow in the dark or make them radioactive.. Everyone is exposed to radiation everyday. Most of this non-occupational radiation exposure comes from natural sources. The table below lists sources and average exposures from both natural and man-made sources of radiation:. ...
The potential toxicity of Di-tert-butyl polysulfides (TPS 44) was evaluated following daily oral administration (gavage) to rats for4 weeks. On completion of the treatment period, designated animals were held fora 2-week treatment-free period in order to evaluate the reversibility of any findings. The study was performed according to OECD(No. 407, 03 October 2008) and Commission Regulation (EC) (No. 440/2008, B.7, 30 May 2008)guidelines and in compliance with the principles of Good Laboratory Practice Regulations. One group of ten male and ten female Sprague-Dawley rats received Di-tert-butyl polysulfides (TPS 44) daily by gavage at dose-level of 300 mg/kg/day for 4 weeks. Two other groups of five males and five females received TPS 44 at 33 or 100 mg/kg/day under the same experimental conditions. A further group of ten males and ten females received the vehicle alone (0.5% carboxymethylcellulose in purified water) under the same experimental conditions, and acted as a control group.The dosage ...
Hydrogen sulfide emissions[edit]. A severe anoxic event at the end of the Permian would have allowed sulfate-reducing bacteria ... Evidence for widespread ocean anoxia (severe deficiency of oxygen) and euxinia (presence of hydrogen sulfide) is found from the ... Models also show that anoxic events can cause catastrophic hydrogen sulfide emissions into the atmosphere (see below).[138] ... Upwelling of this water may have released massive hydrogen sulfide emissions into the atmosphere and would poison terrestrial ...
"Hydrogen sulfide." http://www.npi.gov.au/resource/hydrogen-sulfide National Pollutant Inventory, Australian Government ... Harmful compounds such as methane, a greenhouse gas, and hydrogen sulfide, a pungent, toxic compound, can be found in ... www.npi.gov.au/resource/hydrogen-sulfide. Caumette, P (1993). "Ecology and physiology of phototrophic bacteria and sulfate- ... where geochemically or biologically produced hydrogen sulfide can trigger the formation of blooms of purple sulfur bacteria. ...
Hydrogen Sulfide. National Academies Press (US). Doty RL, Deems DA, Stellar S (August 1988). "Olfactory dysfunction in ... Dementia with Lewy bodies Tumors of the frontal lobe Antibiotics Fibromyalgia Multiple sclerosis Exposure to Hydrogen sulfide ( ...
This compound is the product of the half-neutralization of hydrogen sulfide (H2S) with sodium hydroxide. NaHS is a useful ... The usual laboratory synthesis entails treatment of sodium methoxide (NaOMe) with hydrogen sulfide: NaOMe + H2S → NaHS + MeOH ... Eibeck, R. I. (1963). Sodium Hydrogen Sulfide. Inorg. Synth. Inorganic Syntheses. 7. pp. 128-31. doi:10.1002/9780470132388.ch35 ... In contrast with sodium sulfide (Na2S), which is insoluble in organic solvents, NaHS, being a 1:1 electrolyte, is more soluble ...
Hydrogen Sulfide Carbonyl Sulfide". www.atsdr.cdc.gov. Retrieved 2017-12-04. "Safety and Health Topics , Hydrogen Sulfide - ... Hydrogen Sulfide Hydrogen Sulfide(H2S, H2S), is a naturally occurring gas that is flammable, colorless and poisonous. H2S has a ... Sources of Hydrogen Sulfide Exposure Hydrogen sulfide naturally occurs in hot springs, crude petroleum and natural gas. H2S is ... "hydrogen sulfide". pubchem.ncbi.nlm.nih.gov. Retrieved 2017-12-04. OSHA (October 2005). "OSHA Fact Sheet: Hydrogen Sulfide" ( ...
... is synthesized by the reaction between a solution of potassium sulfide with excess hydrogen sulfide. ... ISBN 978-1-4200-9084-0. Dittmer, Donald C. (2001). "Potassium Hydrogen Sulfide". In Paquette, L. (ed.). Encyclopedia of ... It is the product of the half-neutralization of hydrogen sulfide with potassium hydroxide. The compound is used in the ... Aqueous solutions of potassium sulfide consist of a mixture of potassium hydrosulfide and potassium hydroxide. The structure of ...
Hydrogen sulfide[unreliable source?] "Farts and Flatulence". h2g2.[unreliable source?] Levitt M. D. and Bond J. H. (1978) in ... These substances are detectable by olfactory neurons in concentrations as low as 10 parts per billion, hydrogen sulfide being ... Hydrogen sulfide is also flammable (ΔHc = −519 kJ/mol), and burns to 2 H 2S(g) + 3 O 2(g) → 2 SO 2(g) + 2 H 2O(g) Some of the ... The odor associated with flatus is due to hydrogen sulfide, skatole, indole, volatile amines, and short-chain fatty acids also ...
Hydrogen sulfide is also produced. The salt raises the osmotic pressure of the brine above the zone where bacteria responsible ... hydrogen sulfide), rancid-butter (butyric acid), and vinegary (acetic acid). Due to these gases, a thousand cans of ...
She had ingested hydrogen sulfide. So that was the cause of death and not too much else is going to be released because her ...
Hydrogen sulfide NSAID hybrids prevent the gastric ulceration/bleeding associated with taking the NSAIDs alone. Hydrogen ... Guo W, Cheng ZY, Zhu YZ (October 2013). "Hydrogen sulfide and translational medicine". Acta Pharmacologica Sinica. 34 (10): ... sulfide is known to have a protective effect on the cardiovascular and gastrointestinal system. NSAIDs should be used with ...
She had ingested hydrogen sulfide. So that was the cause of death and not too much else is going to be released because her ...
"ATSDR - ToxFAQs™: Hydrogen Sulfide / Carbonyl Sulfide". www.atsdr.cdc.gov. Retrieved October 28, 2016. "Fed Up Local Citizens ... families living near the site worry about toxic dust and complain of a strong rotten egg smell from hydrogen sulfide (H 2S). ...
Phillipe, A.; Mathieu, P.; Tellier, J.; Voirin, R. (Union Oil Co., USA). "Desulfurization of Gases Containing Hydrogen Sulfide ... in which a variety of zeolites including the Cu-Y variant were used to remove hydrogen sulfide from gases. From then on, ... The hydrodesulfurization technique can remove thiols and sulfides, but cannot efficiently remove thiophenes, therefore the ...
... foul odors of mercaptans and hydrogen sulfide. Hydrogen sulfide is a toxic gas. It also restricts the materials that can be ... Before a raw natural gas containing hydrogen sulfide and/or carbon dioxide can be used, the raw gas must be treated to reduce ... Strictly speaking, a sour gas is any gas that specifically contains hydrogen sulfide in significant amounts; an acid gas is any ... Acid gas is a particular typology of natural gas or any other gas mixture containing significant quantities of hydrogen sulfide ...
"Plasma assisted dissociation of hydrogen sulfide". International Journal of Hydrogen Energy. 37 (2): 1335-1347. doi:10.1016/j. ... For example, the dissociation of hydrogen sulfide can be labeled as an environmental application. However, its production of ... "Plasma assisted dissociation of hydrogen sulfide" Kalghatgi, S.U.; Fridman, G.; Cooper, M.; Nagaraj, G.; Peddinghaus, M.; ... Primarily, he studies and researches how plasma can be used in the Energy Systems, Fuel Conversion & Hydrogen Production ...
Reaction with hydrogen sulfide produces barium sulfide. Precipitation of many insoluble, or less soluble barium salts, may ... Durham, L. J.; McLeod, D. J.; Cason, J. (1958). "Methyl hydrogen hendecanedioate". Org. Synth. 38:55; Coll. Vol. 4:635. [1] ...
... acids and peptides could form in the presence of carbon monoxide and hydrogen sulfide with iron sulfide and nickel sulfide as ... examples are hydrogen sulfide, sulfur and iron. Such extremophile organisms are restricted to otherwise inhospitable ... It was composed of hydrogen and helium created shortly after the Big Bang 13.8 Ga (billion years ago) and heavier elements ... In 2003 it was proposed that porous metal sulfide precipitates would assist RNA synthesis at about 100 °C (212 °F) and at ocean ...
DATS can be metabolized by glutathione in red blood cells to form hydrogen sulfide (H2S). This conversion occurs at a ... Lavu, Madhav; Bhushan, Shashi; Lefer, David J (2011). "Hydrogen sulfide-mediated cardioprotection: Mechanisms and therapeutic ... "Hydrogen sulfide mediates the vasoactivity of garlic". Proceedings of the National Academy of Sciences. 104 (46): 17977-17982. ... A major topic of research is the impact of hydrogen sulfide on reducing myocardial ischemia-reperfusion injury. Reperfusion ...
... s can also produce hydrogen sulfide, a signalling gas that acts to relax vessel walls. It is believed that the ... "Hydrogen sulfide mediates the vasoactivity of garlic". Proceedings of the National Academy of Sciences of the United States of ... cardioprotective effects of garlic are due to red blood cells converting its sulfur compounds into hydrogen sulfide. Red blood ...
Treatment of sulfur with hydrogen gives hydrogen sulfide. When dissolved in water, hydrogen sulfide is mildly acidic: H2S ⇌ HS ... iron sulfide), cinnabar (mercury sulfide), galena (lead sulfide), sphalerite (zinc sulfide), and stibnite (antimony sulfide); ... Hydrogen sulfide is as toxic as hydrogen cyanide,[clarification needed] and kills by the same mechanism (inhibition of the ... Hydrogen sulfide gives the characteristic odor to rotting eggs and other biological processes. Sulfur is an essential element ...
Bacteria producing hydrogen sulfide will appear black. A frequent test done with LIA agar is the LIA slant. Here the LIA is ... LIA is a differential media used to distinguish bacteria that are able to decarboxylate lysine and/or produce hydrogen sulfide ...
A solution of antimony trichloride in liquid hydrogen sulfide is a good conductor, though the applications of such are limited ... McGraw-Hill, 2002, ISBN 0-07-049439-8. Wilkinson, John A. (1931). "Liquid Hydrogen Sulfide as a Reaction Medium". Chemical ... by the very low temperature or high pressure required for hydrogen sulfide to be liquid. In episode 12 of the third season of ... With a limited amount of water it forms antimony oxychloride releasing hydrogen chloride: SbCl3 + H2O → SbOCl + 2 HCl With more ...
While hydrogen sulfide and mercaptans are toxic, they are present in levels so low that suffocation and fire hazard by the ... As fuel, it is often mixed with small amounts of hydrogen sulfide and mercaptans which will give the unburned gas an offensive ... Gresham, Chip (16 November 2019). "Hydrogen Sulfide Toxicity: Practice Essentials, Pathophysiology, Etiology". Medscape ...
"Measurement and biological significance of the volatile sulfur compounds hydrogen sulfide, methanethiol and dimethyl sulfide in ... Levine J, Ellis CJ, Furne JK, Springfield J, Levitt MD (January 1998). "Fecal hydrogen sulfide production in ulcerative colitis ... Suarez FL, Furne JK, Springfield J, Levitt MD (May 1998). "Bismuth subsalicylate markedly decreases hydrogen sulfide release in ... dimethyl sulfide (DMS) dimethyl disulfide (DMDS) dimethyl trisulfide (DMTS) Benzopyrrole volatiles indole skatole Hydrogen ...
... bisulfide salts decompose to produce sulfide salts and hydrogen sulfide. At physiological pH's, hydrogen sulfide is usually ... Bisulfide salts are corrosive are alkaline and release toxic hydrogen sulfide upon acidification. Disulfide Sulfide Sulfanyl ... Its conjugate acid is hydrogen sulfide (H 2S). However, bisulfide's basicity stems from its behavior as an Arrhenius base. A ... bisulfide converts to hydrogen sulfide. With strong acids, it can be doubly protonated to give H 3S+ . Oxidation of bisulfide ...
Phreatic explosions can be accompanied by carbon dioxide or hydrogen sulfide gas-emissions. Carbon dioxide can asphyxiate at ... hydrogen sulfide acts as a broad-spectrum poison. A 1979 phreatic eruption on the island of Java killed 140 people, most of ...
Hydrogen sulfide then builds up to toxic levels. EE was initially described in 1994. Most cases of EE have been described in ... The genetic defect in EE is thought to involve an impairment in the degradation of sulfide intermediates in the body. ... causes fatal sulfide toxicity in ethylmalonic encephalopathy". Nature Medicine. 15 (2): 200-205. doi:10.1038/nm.1907. PMID ...
... but the hydrogen sulfide would soon consume all of the atmospheric gas available. Hydrogen sulfide levels might have increased ... If enough hydrogen sulfide accumulates in an anoxic zone, the gas can rise into the atmosphere. Oxidizing gases in the ... Kump, L.R., A. Pavlov, and M.A. Arthur (2005). "Massive release of hydrogen sulfide to the surface ocean and atmosphere during ... Another hypothesis involves ocean venting of hydrogen sulfide gas. Portions of the deep ocean will periodically lose all of its ...
Like silver, mercury reacts with atmospheric hydrogen sulfide. Mercury reacts with solid sulfur flakes, which are used in ... Preeminent is mercury(II) sulfide, HgS, which occurs in nature as the ore cinnabar and is the brilliant pigment vermillion. ... By-products of any such chloralkali process are hydrogen (H2) and sodium hydroxide (NaOH), which is commonly called caustic ... Mercury occurs in deposits throughout the world mostly as cinnabar (mercuric sulfide). The red pigment vermilion is obtained by ...
Both fumaroles are outgassing steam and hydrogen sulfide. "Senator Fumaroles". Geographic Names Information System. United ...
The natural gas fed into the LNG plant will be treated to remove water, hydrogen sulfide, carbon dioxide and other components ... The "acidic" elements such as hydrogen sulphide (H2S) and carbon dioxide (CO2), together with oil, mud, water, and mercury, are ...
... hydrogen sulfide, hydrogen cyanide, sulfur dioxide and carbon disulfide.[22] The four top gases in 67P's halo were water, ... OAO-2 ('Stargazer') discovered large halos of hydrogen gas around comets.[14] Space probe Giotto detected hydrogen ions at ... A hydrogen gas halo three times the size of the Sun was detected by Skylab around Comet Kohoutek in the 1970s.[19] SOHO ... In 2015, it was noted that the ALICE instrument on the ESA Rosetta spacecraft to comet 67/P, detected hydrogen, oxygen, carbon ...
Protonated molecular hydrogen. *சோடியம் சயனைடு. *சோடியம் ஐதராக்சைடு. *Silicon carbonitride. *c-Silicon dicarbide ...
They easily react with carbon dioxide to form carbonates or bicarbonates, or with hydrogen sulfide to form sulfides or ... HydrogenEdit. The element hydrogen, with one electron per neutral atom, is usually placed at the top of Group 1 of the periodic ... The metal reacts with the water first, breaking the hydrogen bonds in the water and producing hydrogen gas; this takes place ... hydrogen does become metallic and behaves like an alkali metal; in this phase, it is known as metallic hydrogen.[164] The ...
... as well as the inorganic gas hydrogen sulfide. These are the same compounds that are responsible for the odor of flatulence. ...
Impregnated carbons are also used for the adsorption of Hydrogen Sulfide(H2S) and thiols. Adsorption rates for H2S as high as ... Hydrogen storage. References[edit]. *^ a b c d e f g h i Chada, Nagaraju; Romanos, Jimmy; Hilton, Ramsey; Suppes, Galen; ... compounds such as hydrogen sulfide (H2S), ammonia (NH3), formaldehyde (HCOH), mercury (Hg) and radioactive iodine-131(131I). ... "Thermal regeneration of a spent activated carbon adsorbent previously used as hydrogen sulfide adsorbent". Carbon. 39 (9): 1319 ...
Finally, sulfophilic bacteria reduce the bones releasing hydrogen sulfide enabling the growth of chemoautotrophic organisms, ...
The main substance is mostly calcium, but it has a strong unpleasant odor because of hydrogen sulfide and methyl mercaptan and ...
Hydrogen sulfide (sulfane) - H2S. *Pyrosulfuric acid - H2S2O7 ... Nickel(II) sulfide - NiS. Nb[edit]. *Niobium(IV) fluoride - NbF ...
... radioactivity and solubility in hydrogen chloride (HCl).[5]:97-113[8]:39-53 ... sulfides, sulfosalts, oxides and hydroxides, halides, carbonates, nitrates and borates, sulfates, chromates, molybdates and ...
x), and hydrogen sulfide (H. 2S).[7] As the coal face burns and the immediate area is depleted, the oxidants injected are ... such as ammonia and hydrogen sulfide, can be removed from product gas at a relatively low cost.[citation needed] ... 2), hydrogen (H. 2), carbon monoxide (CO), methane (CH. 4). In addition, there are small quantities of various contaminants ... Production of hydrogen.. In addition, carbon dioxide produced as a by-product of underground coal gasification may be re- ...
Hydrogen sensor. *Hydrogen sulfide sensor. *Infrared point sensor. *Ion selective electrode. *ISFET ...
... notably including toxic hydrogen sulfide gas emissions.[1] A separate plant went online in 1993 in Puna's Lower East Rift Zone ... The natural increase in hydrogen sulfide and volcanic ash emissions due to volcanic activity within the Kilauea caldera at ...
... to the oxidation of hydrogen sulfide or elemental sulfur by species of Sulfolobus, using either oxygen or metal ions as ... This process releases hydrogen as a waste product, but high levels of hydrogen reduce energy production. When methanogens ... In the carbon cycle, methanogen archaea remove hydrogen and play an important role in the decay of organic matter by the ... In anaerobic protozoa, such as Plagiopyla frontata, archaea reside inside the protozoa and consume hydrogen produced in their ...
It can also be made by reacting hydrogen sulfide with iodine. Very pure hydrogen iodide can be made by combining hydrogen and ... Hydrogen fluoride. Hydrogen chloride. Hydrogen bromide. Hydrogen astatide Except where otherwise noted, data are given for ... Hydrogen iodide (HI) is a chemical compound. Its chemical formula is HI. It is a colorless odorous gas. It reacts with oxygen ... Retrieved from "https://simple.wikipedia.org/w/index.php?title=Hydrogen_iodide&oldid=6400663" ...
Atomic hydrogen is much more reactive than molecular hydrogen. In contact with surface oxides it forms hydroxides, water, or ... Some of the earliest known fluxes were sodium carbonate, potash, charcoal, coke, borax,[1] lime,[2] lead sulfide[3] and certain ... The addition of hydrogen to the plasma[which?] augments the removal efficiency by chemical mechanisms.[citation needed] ... Argon-hydrogen gas compositions with hydrogen concentration below the low flammable limit can be used, eliminating the safety ...
One chemical result of burning hydrogen sulphide emissions was sulfur dioxide, another toxic gas. Since hydrogen sulphide is ... Sour gas, as it is known, in its natural state is laced with hydrogen sulfide (H2S), which can be lethal if inhaled in even ... During that time hydrogen sulphide from the blowout took the lives of two blowout specialists and sent another 16 people to ... It removed hydrogen sulphide by exposing the sour gas to dissolved soda ash. Although previously used on coal gas, the ...
... and hydrogen sulfide (H2S) from natural gas and refinery process streams. They may also be used to remove CO2 from combustion ... Amines are formally derivatives of ammonia, wherein one or more hydrogen atoms have been replaced by a substituent such as an ... Primary (1°) amines-Primary amines arise when one of three hydrogen atoms in ammonia is replaced by an alkyl or aromatic group ... Hydrogen bonding significantly influences the properties of primary and secondary amines. For example, methyl and ethyl amines ...
First, silicon is treated with hydrogen chloride at about 300 °C to produce trichlorosilane, HSiCl3, along with hydrogen gas, ... Protonated hydrogen cyanide. *Silicon tricarbide. *Thioformaldehyde. *Tricarbon monoxide. *Tricarbon sulfide. *Thiocyanic acid ... They called the compound siliciuretted hydrogen.[8] For classroom demonstrations, silane can be produced by heating sand with ... Silane can be produced by several routes.[6] Typically, it arises from the reaction of hydrogen chloride with magnesium ...
... hydrogen sulfide, nitrogen dioxide, ozone, and ammonia are among the most important irritant gases. Hydrogen sulfide is also a ... Smoke, chlorine, phosgene, sulfur dioxide, hydrogen chloride, hydrogen sulfide, nitrogen dioxide, ozone, and ammonia are common ... Beneficial effect of a hydrogen sulphide donor (sodium sulphide) in an ovine model of burn- and smoke-induced acute lung injury ... Chlorine is a strong oxidizing element causing the hydrogen to split from water in moist tissue, resulting in nascent oxygen ...
... a liquid at room temperature because its molecules are bound by hydrogen bonds.[29] Whereas hydrogen sulfide (H2S) is a gas at ... A chemical bond can be a covalent bond, an ionic bond, a hydrogen bond or just because of Van der Waals force. Each of these ... That is, substances with a higher Ka are more likely to donate hydrogen ions in chemical reactions than those with lower Ka ... In the methane molecule (CH4), the carbon atom shares a pair of valence electrons with each of the four hydrogen atoms. Thus, ...
Protonated hydrogen cyanide. *Silicon tricarbide. *Thioformaldehyde. *Tricarbon monoxide. *Tricarbon sulfide. *Thiocyanic acid ... And he proposed a theory that they were produced in interstellar space as by-products of the fusion of hydrogen atoms into the ... The mass ratio of helium to hydrogen nuclei, 28%, is similar to the primordial elemental abundance ratio of these elements, 24 ... hydrogen nuclei); 9% are alpha particles, identical to helium nuclei; and 1% are the nuclei of heavier elements, called HZE ...
... in March 2015 by the Sutherland group found that a network of reactions beginning with hydrogen cyanide and hydrogen sulfide, ... the purine base known as adenine is merely a pentamer of hydrogen cyanide. Experiments with basic ribozymes, like Bacteriophage ... "PNA hybridizes to complementary oligonucleotides obeying the Watson-Crick hydrogen-bonding rules". Nature. 365 (6446): 566-8. ...
Sulfides tend to be soft, brittle minerals with a high specific gravity. Many powdered sulfides, such as pyrite, have a ... The sheets are weakly bound by van der Waals forces or hydrogen bonds, which causes a crystallographic weakness, in turn ... Sulfates can also be found in hydrothermal vein systems associated with sulfides,[138] or as oxidation products of sulfides.[ ... It is not, however, an ore of iron, but can be instead oxidized to produce sulfuric acid.[127] Related to the sulfides are the ...
IUPAC Compendium of Chemical Terminology, Electronic version, Hydrogen Bond *^ Sandrock, Gary (02-05-2002). "Metal-Hydrogen ... Dimethyl Sulfide, and Dimethyl Sulfoxide". Journal of the American Chemical Society. 99 (21): 6983-6986. doi:10.1021/ ... "Hydrogen (H2) Properties, Uses, Applications: Hydrogen Gas and Liquid Hydrogen". Universal Industrial Gases, Inc. Diakses ... "Safety Standard for Hydrogen and Hydrogen Systems" (PDF). NASA. Diakses tanggal 2008-02-05.. Parameter ,coauthors=. yang tidak ...
O and silver sulphide protocells in 1941.. [7]. Russell Ohl patented the modern junction semiconductor solar cell in 1946[8] ... from silane gas and hydrogen gas. Depending on the deposition parameters, this can yield amorphous silicon (a-Si or a-Si:H), ... or to a device that splits water directly into hydrogen and oxygen using only solar illumination. ...
Hydrogen sensor. *Hydrogen sulfide sensor. *Infrared point sensor. *Ion selective electrode. *ISFET ... the same measurement tube can be used for hydrogen gas and bitumen without recalibration.[citation needed] ...
Hydrogen sulfide (H2S). *Nitric oxide (NO). Candidates. *Acetaldehyde. *Ammonia (NH3) ...
It can produce hydrogen sulfide gas, and forms clear films on growth media. It is motile, possessing peritrichous flagella, and ...
Q. Weng, X. Wang, X. Wang, D. Liu, X. Jiang, C.Y. Zhi, Y. Bando, D. Golberg : «Preparation and Hydrogen Sorption Performances ... P. M.F.J. Costa, U. K. Gautam, Y. Bando and D. Golberg : «Comparative study of the stability of sulfide materials encapsulated ... Q. Weng, X. Wang, Chunyi Zhi, Y. Bando, D. Golberg : «Boron nitride porous microbelts for hydrogen storage» ACS Nano 7[2] (2013 ... G. Shen, Y. Bando, Y. Gao and D. Golberg : «Synthesis and Interface Structures of Zinc Sulfide Sheathed Zinc−Cadmium Nanowire ...
Exposure to hydrogen sulfide may cause irritation to the eyes and respiratory system. It can also cause apnea, coma, ... Hydrogen sulfide (H₂S) is a colorless gas with a strong odor of rotten eggs. ... Hydrogen sulfide (H₂S) is a colorless gas with a strong odor of rotten eggs. Exposure to hydrogen sulfide may cause irritation ... EPA Acute Exposure Guideline Levels: Hydrogen Sulfideexternal icon. *EPA Toxicological Review of Hydrogen Sulfidepdf icon ...
hydrogen sulfide, chemical compound, H2S, a colorless, extremely poisonous gas that has a very disagreeable odor, much like ... Hydrogen Chloride , Hydrogen chloride is a chemical compound composed of the elements hydrogen and chlorine . It readily ... hydrogen sulphide Colourless, poisonous gas (H2S) with the smell of bad eggs. It is produced by decaying matter, found in crude ... www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/hydrogen-sulphide ...
Just a few breaths of air containing high levels of hydrogen sulfide gas can cause death. Lower, longer-term exposure can cause ... Hydrogen sulfide occurs naturally and is also produced by human activities. ... What happens to hydrogen sulfide when it enters the environment?. * Hydrogen sulfide can be released into air, water, and soil ... How likely is hydrogen sulfide to cause cancer?. Hydrogen sulfide has not been shown to cause cancer in humans, and its ...
Hydrogen sulfide. CAS No: 7783-06-4. NOTE:. (1) Efficacy of Medical Tests has not been evaluated.. (2) NIOSH references include ... Hydrogen sulfide. Editor(s). /Author(s). Specific Medical Test(s) or Examination(s). Reference(s). ...
Hydrogen sulfide is slightly denser than air; a mixture of H 2S and air can be explosive. Hydrogen sulfide burns in oxygen with ... The sulfide anion S2− is not formed in aqueous solution. Hydrogen sulfide reacts with metal ions to form metal sulfides, which ... In addition, hydrogen sulfide has been shown to reduce inflammation in various situations. Small amounts of hydrogen sulfide ... Treating metal sulfides with strong acid often liberates hydrogen sulfide. At pressures above 90 GPa (gigapascal), hydrogen ...
Hydrogen sulfide smells like rotten eggs. People can smell hydrogen sulfide at concentrations as low as 0.5 parts of hydrogen ... at concentrations over 100 ppm most people can no longer smell hydrogen sulfide, which makes it very dangerous. ... sulfide per billion parts of air (ppb, 1 ppb is 1,000 times less than 1 part per million [ppm]). However, ... Hydrogen sulfide is a colorless, flammable gas under normal conditions. It is commonly known as hydrosulfuric acid, stink damp ...
Sulfureted hydrogen; H2S; Sulfuretted hydrogen; Hydrogen sulphide; Hydrogen sulfide (H2S); Acide sulfhydrique; Hydrogene ... Other names: Dihydrogen monosulfide; Dihydrogen sulfide; Hydrosulfuric acid; Stink damp; Sulfur hydride; ...
A hydrogen sulfide sensor or H2S sensor is a gas sensor for the measurement of hydrogen sulfide. In a laboratory, hydrogen ... a hydrogen sulfide sensor is used in personal protective equipment to warn for the presence of hydrogen sulfide gas, e.g. on ... When iron sulfide reacts with diluted sulfuric acid, hydrogen sulfide is formed which is collected in the gas jar by upward ... a H2S sensor is used to detect hydrogen sulfide in the hydrogen feed stream of fuel cells to prevent catalyst poisoning and to ...
Hydrogen Sulfide in Industry. This document describes the dangers of hydrogen sulfide (H2S) in the workplace, and how to avoid ... Hydrogen sulfide. Hydrogen sulfide is a dangerous toxic gas found in many industries. At low concentrations it causes health ... Hydrogen sulfide is a by-product in many different industries. Some common sources of the gas are: Sewage systems *Anywhere ... Hydrogen sulfide is heavier than air and will settle into low areas. In confined spaces it can quickly reach lethal ...
Hydrogen sulfide and mercaptan sulfur, IP104, IP103, UOP 163. *Hydrogen sulfide and sulfur dioxide in aromatic hydrocarbons, ... Hydrogen sufide testing of crude oil, petroleum products, chemicals and gases.. Hydrogen sulfide testing measures H2S content ... Additional hydrogen sulfide and sulfur related testing methods are available. H2S management and additive treatment solutions ... Hydrogen sulfide test methods:. *Hydrogen sulfide content (vapor phase), ASTM D5705. *Hydrogen sulfide content (liquid phase), ...
Hydrogen sulfide definition, a colorless, flammable, water-soluble, cumulatively poisonous gas, H2S, having the odor of rotten ... hydrogen peroxide, hydrogen sulfide, hydrogen sulphate, hydrogen sulphide, hydrogen sulphite, hydrogen tartrate, hydrogen ... Words nearby hydrogen sulfide. hydrogen ion, hydrogenize, hydrogenolysis, hydrogenous, ... Hydrogen sulfide is used in the petroleum, rubber, and mining industries, and in making sulfur. Chemical formula: H2S. ...
Hydrogen sulfide (H2 S) is a colorless, flammable gas that has strong odor of rotten eggs. H2 S poisoning is a rarity, mainly ... encoded search term (Hydrogen Sulfide Toxicity) and Hydrogen Sulfide Toxicity What to Read Next on Medscape ... 45 deaths from hydrogen sulfide exposure occurred, all of them unintentional. [2] In occupationally-related hydrogen sulfide ... and sulfur springs also produces hydrogen sulfide. In nature, hydrogen sulfide can be found in caves, sulfur springs, ...
Hydrogen Damage . of Downhole Tubulars . . Hydrogen Sulfide (H2S) .The sulfide stress cracking characteristic of steel tubulars ... From hydrogen sulfide stress cracking, . Matching Tubulars to .tubulars is about 2x to 4x . Hydrogen Sulfide Corrosion .By Anne ... Hydrogen Sulfide in the Drilling . Hydrogen Sulfide Cracking of Downhole Tubulars.2005-5-12 Material Spec for High Partial Pres ... Hydrogen sulfide. (CFR).The main concerns for downhole tubulars from the related . The presence of hydrogen sulfide . Corrosion ...
Hydrogen sulfide as a gasotransmitter.. Gadalla MM1, Snyder SH.. Author information. 1. Department of Pharmacology and ... Hydrogen sulfide (H(2)S) is even more chemically reactive, but until recently there was little definitive evidence for its ... EDHF; EDRF; GAPDH; KATP; S-sulfhydration; cystathionase; cystathionine β-synthase; cystathionine γ-lyase; hydrogen sulfide; ...
Hydrogen sulfide (H2 S) is a colorless, flammable gas that has strong odor of rotten eggs. H2 S poisoning is a rarity, mainly ... encoded search term (Hydrogen Sulfide Toxicity) and Hydrogen Sulfide Toxicity What to Read Next on Medscape. Related Conditions ... Based on the similarities in cyanide and hydrogen sulfide toxicity, induced methemoglobinemia may be used in hydrogen sulfide ... Hydrogen Sulfide Toxicity Treatment & Management. Updated: Nov 16, 2019 * Author: Chip Gresham, MD, FACEM; Chief Editor: ...
Hydrogen sulfide reacts with many metal cations to produce the corresponding metal sulfides. (Sulfides should not be confused ... Hydrogen sulfide, sulfane. Other names. Sulfuretted hydrogen; sulfane; sulfur hydride; sour gas; sulfurated hydrogen; ... hydrogen sulfide functions as a vasodilator and is also active in the brain. Moreover, hydrogen sulfide plays a key role in the ... the body produces an excess of hydrogen sulfide.. Toxicity. Hydrogen sulfide is a highly toxic and flammable gas. Being heavier ...
Another hydrogen sulfide (H2S) suicide, with altruism. A year ago we wrote about a death of a San Jose teenager from poisoning ... Pans of hydrogen sulfide in San Jose teenagers death?. Yes, this is what happens when two scientists stay home on Valentines ... So, when I saw a bunch of hits starting yesterday with search terms like "hydrogen sulfide," I feared the worst: that another ... by hydrogen sulfide gas, or H2S. At the time, I had hypothesized that the death might have been from an attempt at synthesizing ...
Hydrogen sulfide is a worthy target, said Rouse, who studies DNA repair and aging. Colorless and flammable, hydrogen sulfide ... we are finding changes in hydrogen sulfide synthesis or changes in how hydrogen sulfide is used by the body." The gas appears ... adding that early research on hydrogen sulfide focused on its toxic effects. "It was assumed that any hydrogen sulfide in the ... its gone from there being sessions at conferences on hydrogen sulfide to full-grown conferences where only hydrogen sulfide is ...
1ATSDR Toxicological Profile on Hydrogen Sulfide: https://www.atsdr.cdc.gov/ToxProfiles/tp114-a.pdf 2AEGL for Hydrogen Sulfide ... Air Monitoring for Hydrogen Sulfide. Community Monitoring Update. Data has and will continue to drive decisions and activities ... Hydrogen Sulfide2. Classification. 10 min. 30 min. 1 hour. 4 hour. 8 hour. ... The goal of both the EPA and DHEC Orders is for the site to continue to identify sources of hydrogen sulfide emissions and ways ...
The Model 4501-05 2-wire Hydrogen Sulfide Gas Detector from Sierra Monitor Corporation is a loop powered gas detector that ... Hydrogen Sulfide Gas Detector. The Model 4501-05 2-wire Hydrogen Sulfide Gas Detector from Sierra Monitor Corporation is a loop ... The SMC 2-wire Hydrogen Sulfide Gas Detector provides the following features:  Low maintenance costs due to 180 day (six-month ... The Model 4501-05 2-wire Hydrogen Sulfide Gas Detector from Sierra Monitor Corporation is a loop powered gas detector that ...
Learn how Bechtels hydrogen sulfide production unit produces a high-quality hydrogen sulfide product from hydrogen and liquid ... The hydrogen sulfide produced exits the reactor and enters the hydrogen sulfide cleanup section. In the hydrogen sulfide ... Hydrogen Sulfide Production Unit. The Bechtel hydrogen sulfide production unit produces a high-quality hydrogen sulfide product ... Sulfur in the hydrogen sulfide product is removed in the hydrogen sulfide cleanup section. The sulfur removed in the cleanup ...
Purchase Hydrogen Sulfide in Redox Biology Part A, Volume 554 - 1st Edition. Print Book & E-Book. ISBN 9780128015124, ... Section I: Hydrogen Sulfide Detection Methods *Chapter one: Mechanistic Chemical Perspective of Hydrogen Sulfide Signaling * ... Covers the pharmacological activity of hydrogen sulfide donors. *Contains chapters on important topics on hydrogen sulfide ... the redox biochemistry of hydrogen sulfide and its metabolism in mammalian tissues, the mechanisms inherent in hydrogen sulfide ...
The report on Hydrogen Sulfide industry has been studied in terms of key segments and sub-segments. The currently leading ... hydrogen sulfide industryhydrogen sulfide 2017hydrogen sulfidehydrogen sulfide market sizehydrogen sulfide market sharehydrogen ... 1 Hydrogen Sulfide Market Overview. 1.1 Product Overview and Scope of Hydrogen Sulfide. 1.2 Hydrogen Sulfide Segment by Type. ... 1.3 Hydrogen Sulfide Segment by Application. 1.3.1 Hydrogen Sulfide Consumption Market Share by Application in 2015. 1.3.2 ...
Buy Hydrogen Sulfide by C.-H.Selene J. Chou from Waterstones today! Click and Collect from your local Waterstones or get FREE ... Hydrogen Sulfide: Environmental Health Aspects - Concise International Chemical Assessment Documents No. 53 (Paperback). C.-H. ...
... a bacterial defense that relies on hydrogen sulfide, can be suppressed by potentiator drugs that target a bacterial enzyme. ... hydrogen sulfide protects bacteria against the toxic effects of oxidative stress. To deprive bacteria of hydrogen sulfide, ... Hydrogen sulfide, it happens, is critical to the innate ability of bacteria to survive normally lethal levels of antibiotics. ... Home Therapeutics Antibiotics Antibiotic-Tolerant Bacteria Vulnerable to Hydrogen Sulfide Pathway Blockers ...
Hydrogen Sulfide. University Park Press, Baltimore Md, USA, 1979. *M. Bhatia, "Hydrogen sulfide and substance P in inflammation ... water-soluble hydrogen sulfide-releasing molecule (GYY4137): new insights into the biology of hydrogen sulfide," Circulation, ... M. Bhatia, "Hydrogen sulfide as a vasodilator," IUBMB Life, vol. 57, no. 9, pp. 603-606, 2005. View at Publisher · View at ... Role of Hydrogen Sulfide in the Pathology of Inflammation. Madhav Bhatia Department of Pathology, University of Otago, P.O. Box ...
Get the latest hydrogen sulfide monitor news on Environmental XPRT, the worlds largest environmental industry marketplace and ... hydrogen sulfide monitor News. Related terms for "hydrogen sulfide monitor ": sulfide monitor news , hydrogen sulfide news ... Mercaptans and hydrogen sulfide in crude oil as per ASTM D3227 and UOP163 In the refining process of crude oil, sulfur ... OSHA requires Hydrogen Sulfide (H2S) training if workers are exposed to any concentrations of H2S that may exceed 10 parts per ...
  • Just a few breaths of air containing high levels of hydrogen sulfide can cause death. (cdc.gov)
  • Workers on farms with manure storage pits or landfills can be exposed to higher levels of hydrogen sulfide. (cdc.gov)
  • On the other hand, low levels of hydrogen sulfide are associated with high blood pressure, Parkinson's disease and Alzheimer's disease, it said. (heraldnet.com)
  • A proposed ASTM International standard will protect worker's healthby monitoring the levels of hydrogen sulfide gas in workplace air. (astm.org)
  • This result may seem surprising at first given that exposure to high levels of hydrogen sulfide can be toxic to mammalian health. (news-medical.net)
  • The air sample detected levels of hydrogen sulphide that exceeds both the Ontario 24-hour health based standard and the 10-minute odour based standard. (ecojustice.ca)
  • Can scrubbers be installed to remove hydrogen sulfide? (worksafebc.com)
  • Many of the systems included are used to remove hydrogen sulfide in industrial processes, and industrially important systems including carbon dioxide are also discussed. (elsevier.com)
  • An investigation to determine if this reaction could be economically used to remove hydrogen sulfide from geothermal noncondensible gases is reported. (unt.edu)
  • a hydrogen sulfide sensor is used in personal protective equipment to warn for the presence of hydrogen sulfide gas, e.g. on acid gas production sites. (wikipedia.org)
  • The presence of hydrogen sulfide doesn't just smell bad, it may also tarnish your silver or corrode your plumbing and fixtures. (culligan.com)
  • Jupiter and its cousins, by contrast, are mostly made of hydrogen and hydrogen compounds. (dictionary.com)
  • Organic decomposition of sulfur compounds in sewers, barns, liquid manure pits, ships' holds, and sulfur springs also produces hydrogen sulfide. (medscape.com)
  • For instance, it is used to prepare organosulfur compounds (sulfur-containing organic compounds) and various metal sulfides and hydrosulfides. (newworldencyclopedia.org)
  • Other compounds of carbon, hydrogen and oxygen. (elsevier.com)
  • Various H 2 S-releasing compounds, including sulfide salts, diallyl disulfide, diallyl trisulfide, sulforaphane, and other polysulfides, also have been shown to inhibit prostate cancer growth and metastasis. (hindawi.com)
  • Tungsten carboxylate compounds useful for coating interdigitated electrodes used in hydrogen sulfide gas sensors are disclosed. (google.com)
  • Electrodes which are solution coated with the compounds may be used to fabricate superior quality chemiresistor sensors for use in hydrogen sulfide gas sensing devices by heating the carboxylates above 350 C. to decompose certain carboxylates to WO 3 and others to sodium tungstate. (google.com)
  • To determine how the different areas of the body are affected by hydrogen sulfide, researchers used different compounds to selectively block the production of hydrogen sulfide in the brain or in peripheral cells. (news-medical.net)
  • Kupzit® reacts within minutes with sulphur compounds such as hydrogen sulfide and mercaptans. (morebeer.com)
  • Then, in the presence of dissolved oxygen, it oxidizes the sulfides and converts them into non-objectionable compounds. (freedrinkingwater.com)
  • Sulfide also refers to chemical compounds large families of inorganic and organic compounds, e.g. lead sulfide and dimethyl sulfide. (wikipedia.org)
  • Sulfide compounds can be prepared in several different ways: Direct combination of elements: Example: Fe(s) + S(s) → FeS(s) Reduction of a sulfate: Example: MgSO4(s) + 4C(s) → MgS(s) + 4CO(g) Precipitation of an insoluble sulfide: Example: M2+ + H2S(g) → MS(s) + 2H+(aq) Many metal sulfides are so insoluble in water that they are probably not very toxic. (wikipedia.org)
  • Lead(II) acetate paper is used to detect hydrogen sulfide because it readily converts to lead(II) sulfide, which is black. (wikipedia.org)
  • This type of sensor has been under constant development because of the toxic and corrosive nature of hydrogen sulfide: a H2S sensor is used to detect hydrogen sulfide in the hydrogen feed stream of fuel cells to prevent catalyst poisoning and to measure the quality of guard beds used to remove sulfur from hydrocarbon fuels. (wikipedia.org)
  • Hydrogen sulfide is a flammable, colorless gas that smells like rotten eggs. (cdc.gov)
  • Hydrogen sulfide (H 2 S) is a flammable, colorless gas that smells like rotten eggs. (cdc.gov)
  • Methane and hydrogen sulfide , both highly flammable and potentially explosive gases, are also constant hazards. (dictionary.com)
  • Hydrogen sulfide is a chemical compound with the formula , H 2 S. It is a colorless, toxic , and flammable gas , and is responsible for the foul odor of rotten eggs and flatulence. (newworldencyclopedia.org)
  • Colorless and flammable, hydrogen sulfide was used briefly in warfare during the First World War as a chemical weapon. (heraldnet.com)
  • Hydrogen sulfide (H 2 S) is well known as a colorless, flammable, and water soluble gas with the distinctive smell of rotten eggs and has received attention as a toxic gas and as an environmental hazard for many decades. (rsc.org)
  • Hydrogen Sulfide characterized by a rotten egg odor is a flammable gas that can cause various health risks from nausea to vomiting to coma. (mysafetysign.com)
  • Hydrogen Sulfide ( H2S ) Hydrogen sulfide is a colorless, flammable, extremely hazardous gas with a "rotten egg" smell that occurs at low concentrations, and nausea, headaches and death occurring at higher levels. (kcbd.com)
  • Abe K, Kimura H (1996) The possible role of hydrogen sulfide as an endogenous neuromodulator. (springer.com)
  • Cao X, Bian J (2016) The role of hydrogen sulfide in renal system. (springer.com)
  • Wu CHK (2013) The role of hydrogen sulphide in lung diseases. (springer.com)
  • Magierowski M, Jasnos K, Kwiecień S, Brzozowski T (2012) Role of hydrogen sulfide in the physiology of gastrointestinal tract and in the mechanism of gastroprotection. (springer.com)
  • In an effort to better understand cardiovascular disease, Lacy Alexander, associate professor of kinesiology, Penn State, and colleagues have launched a series of studies to examine the role of hydrogen sulfide in preventing and reducing hypertension. (news-medical.net)
  • In a study published this month in Communications Biology , researchers from the University of Tsukuba further investigated the role of hydrogen sulfide as a bioactive gas in the body. (news-medical.net)
  • By unraveling the effect of hydrogen sulfide in the brain centers that control breathing, researchers can now begin to explore the potential role of hydrogen sulfide in disorders that affect breathing such as central sleep apnea or hyperventilation. (news-medical.net)
  • Immediately Dangerous to Life or Health (IDLH) Value Profile: Hydrogen sulfide -The IDLH documents the criteria and information sources used by NIOSH to determine immediately dangerous to life or health concentrations. (cdc.gov)
  • People usually can smell hydrogen sulfide at low concentrations in air ranging from 0.0005 to 0.3 parts per million (ppm). (cdc.gov)
  • Exposure to low concentrations of hydrogen sulfide may cause irritation to the eyes, nose, or throat. (cdc.gov)
  • Respiratory distress or arrest has been observed in people exposed to very high concentrations of hydrogen sulfide. (cdc.gov)
  • Exposure to low concentrations of hydrogen sulfide may cause headaches, poor memory, tiredness, and balance problems. (cdc.gov)
  • Brief exposures to high concentrations of hydrogen sulfide can cause loss of consciousness. (cdc.gov)
  • Hydrogen sulfide air concentrations from natural sources range between 0.00011 and 0.00033 ppm. (cdc.gov)
  • Hydrogen sulfide concentrations in surface water are usually very low because it readily evaporates from water. (cdc.gov)
  • Workers can't always rely on their nose to detect the gas: concentrations of hydrogen sulfide numb the sense of smell, so workers may not notice any odour. (worksafebc.com)
  • ABSTRACT This paper discusses the use of the Sycamore Continuous Emissions Monitor (CEM) for monitoring Hydrogen Sulfide Gas concentrations within odor control systems. (environmental-expert.com)
  • However, it is also assumed that hydrogen sulfide, at least at low concentrations in the intestine, could as well have beneficial effects for our health. (innovations-report.com)
  • ENVIRORENT has released the Jerome 631-X hydrogen sulphide analyser, designed to display low-level concentrations in seconds. (ferret.com.au)
  • An occupational health survey of 10 paper mills in Finland revealed concentrations in air varying from 0 to 20ppm H 2 S, 0 to 15ppm methyl mercaptan and dimethyl sulfide, 0 to 1.5ppm dimethyl disulfide and up to 20ppm SO 2 . (ilo.org)
  • According to the United States Agency for Toxic Substances and Disease Registry, "Exposure to low concentrations of hydrogen sulphide may cause irritation to the eyes, nose, or throat. (ecojustice.ca)
  • Hydrogen sulfide (H₂S) is a colorless gas with a strong odor of rotten eggs. (cdc.gov)
  • The odor threshold range for hydrogen sulfide is 0.0005 to 0.3 ppm (0.5 to 300 ppb). (scdhec.gov)
  • This paper discusses hydrogen sulfide limits for various states that have recently updated their limits or whose limits demonstrate a distinction between health and odor-based limits. (ingentaconnect.com)
  • Odor discussions often focus on hydrogen sulfide because it has a low odor threshold and it is easily detected and recognized. (ingentaconnect.com)
  • Hydrogen sulphide (H2S) is a colorless gas with the characteristic foul odor of rotten eggs. (frontiersin.org)
  • Rotten egg odor is one of the most common and unpleasant effects of hydrogen sulfide , or H2S, in your water. (culligan.com)
  • Other anthropogenic sources of hydrogen sulfide include coke ovens, paper mills (using the sulfate method), and tanneries . (newworldencyclopedia.org)
  • Hydrogen sulfide is a dangerous toxic gas found in many industries. (worksafebc.com)
  • The most common toxic gas used in chemical suicides is hydrogen sulfide, produced using readily available consumer products, according to the Office of Emergency Management. (daytondailynews.com)
  • Both methods oxidize sulfides to less toxic sulfates . (newworldencyclopedia.org)
  • So, when I saw a bunch of hits starting yesterday with search terms like "hydrogen sulfide," I feared the worst: that another young person had committed suicide by mixing household chemicals to release the toxic and potentially fatal gas and search engines were driving traffic to one of my earlier hydrogen sulfide posts. (scienceblogs.com)
  • Hydrogen sulfide - maligned for its toxic and explosive properties - may slow aging and block damaging chemical reactions inside cells, according to scientists in China, who reviewed studies on the malodorous gas and its effects on the cardiovascular and nervous systems. (heraldnet.com)
  • Precisely how hydrogen sulfide does its business is not clear, and that's also exciting," Whiteman said, adding that early research on hydrogen sulfide focused on its toxic effects. (heraldnet.com)
  • Essentially, hydrogen sulfide protects bacteria against the toxic effects of oxidative stress. (genengnews.com)
  • In a doctoral research project conducted at the Department of Biology, the degradation of the dietary sugar sulfoquinovose by anaerobic bacteria to toxic hydrogen sulfide was described for the first time - increased production of hydrogen sulfide in the human intestinal system has been associated with inflammatory bowel disease and colon cancer. (innovations-report.com)
  • Another bacterium, Desulfovibrio, utilizes this intermediate for anaerobic respiration and produces toxic hydrogen sulfide (H2S). (innovations-report.com)
  • In future studies, the researchers will have to examine whether sulfoquinovose in the intestine is indeed metabolized to hydrogen sulfide, which is a toxic compound for humans. (innovations-report.com)
  • Widely considered simply a malodorous toxic gas, hydrogen sulfide is now being studied for its probable role in regulating blood pressure, according to researchers. (news-medical.net)
  • Hydrogen sulfide (H 2 S) is a toxic gas found in volcanic emissions or produced in waterlogged wetlands. (frontiersin.org)
  • The hydrogen sulfide gas is highly toxic to fish. (nasa.gov)
  • The toxic effects of hydrogen sulfide appear to be mediated through blocking the ability of our colon cells from utilizing butyrate, which is what our good bacteria make from the fiber we eat. (nutritionfacts.org)
  • A small amount of hydrogen sulfide is produced by bacteria in your mouth and digestive tract. (cdc.gov)
  • Our future plans include working with hypertensive individuals and also examining the effects of a treatment that gives back a small amount of hydrogen sulfide while treating high blood pressure ,' Alexander said. (news-medical.net)
  • Because of the wide variation in the amount of hydrogen sulfide present at The Geysers, two different gas analyses were considered for treatment. (unt.edu)
  • Hydrogen sulfide burns in oxygen with a blue flame to form sulfur dioxide (SO 2) and water. (wikipedia.org)
  • the carbon was much heavier than oxygen, and even thicker than hydrogen. (dictionary.com)
  • In the emergency department, high-flow (100%) oxygen is the mainstay of therapy for hydrogen sulfide poisoning. (medscape.com)
  • Sulfate-reducing bacteria obtain energy by oxidizing organic matter or hydrogen with sulfates , producing H 2 S. These microorganisms are prevalent in low-oxygen environments, such as in swamps and standing waters. (newworldencyclopedia.org)
  • The molecular structure of hydrogen sulfide is similar to that of water (H 2 O). This is understandable because oxygen and sulfur occur in the same group of the periodic table . (newworldencyclopedia.org)
  • ENMET's Wet Well Monitoring System is specifically designed for monitoring Methane (CH4), Oxygen (O2) and Hydrogen Sulfide (H2S) in a hazardous wastewater treatment plant environment. (environmental-expert.com)
  • The meeting of hydrogen sulfide gas and oxygen-rich surface waters causes pure sulfur to precipitate into the water. (nasa.gov)
  • In the six years that he has been there, he has performed research testing to facilitate the release of sensors that measure different chemical species, including nitric oxide, hydrogen peroxide, hydrogen sulfide, and oxygen. (rsc.org)
  • The ultimate goal: designing self-injectable hydrogen-sulfide kits that critically injured soldiers could use in the field to temporarily dim their metabolism and reduce their oxygen demand. (webwire.com)
  • The yellowish clouds of sulfur come from hydrogen sulfide gas produced by anaerobic bacteria (bacteria that can live without oxygen) at the ocean floor. (nasa.gov)
  • Hydrogen sulfide (H 2 S) gas is produced as a result of the microbial breakdown of organic materials in the absence of oxygen. (powermag.com)
  • The removal of hydrogen sulfide and oxygen was monitored. (wur.nl)
  • The utilization rates of both hydrogen sulfide and oxygen suggested exponential bacterial growth with median growth rates of 1.25 d(-1) and 1.33 d(-1) as determined from the utilization rates of hydrogen sulfide and oxygen, respectively. (wur.nl)
  • L. Li, A. Hsu, and P. K. Moore, "Actions and interactions of nitric oxide, carbon monoxide and hydrogen sulphide in the cardiovascular system and in inflammation-a tale of three gases! (hindawi.com)
  • Evidence for the formation of a novel nitrosothiol from the gaseous mediators nitric oxide and hydrogen sulphide," Biochemical and Biophysical Research Communications , vol. 343, no. 1, pp. 303-310, 2006. (hindawi.com)
  • Hydrogen sulfide (H 2 S) has been regarded as the third gaseous transmitter alongside nitric oxide (NO) and carbon monoxide (CO). In mammalian brain, H 2 S is produced redundantly by four enzymatic pathways, implying its abundance in the organ. (springer.com)
  • The gasotransmitters nitric oxide (NO), carbon monoxide (CO), and hydrogen sulfide (H 2 S) have emerged as crucial regulators of vascular disease in diabetes ( 2 ). (diabetesjournals.org)
  • David Schleheck: "To better understand the human microbiome and the effects of hydrogen sulfide, it is essential to know all the pathways that can lead to hydrogen sulfide production. (innovations-report.com)
  • This Public Health Statement summarizes what is known about hydrogen sulfide such as possible health effects from exposure and what you can do to limit exposure. (cdc.gov)
  • This review details up-to-date research on the electrochemical detection of hydrogen sulfide (ion selective electrodes, polarographic hydrogen sulfide sensors, etc. ) in biological samples for potential therapeutic use. (rsc.org)
  • We want to investigate if these degradation pathways can also be found in the intestine and how much they contribute to the overall production of hydrogen sulfide, depending on the diet", says David Schleheck, whose research team has been supported by the Heisenberg Programme of the German Research Foundation (DFG). (innovations-report.com)
  • The production of hydrogen sulfide in general can contribute to inflammatory bowel disease and colon cancer. (innovations-report.com)
  • Researchers have recently discovered that the body's production of hydrogen sulfide is important to generate a normal breathing pattern, potentially leading to new treatments for people suffering from breathing disorders such as central sleep apnea. (news-medical.net)
  • First they looked at the effect of inhibiting the activity of the CBS enzyme in rats, thereby inhibiting the production of hydrogen sulfide. (news-medical.net)
  • From this, the researchers concluded that the production of hydrogen sulfide allows the regions of the brain that are responsible for controlling breathing patterns to function normally. (news-medical.net)
  • The proposed standard will use direct-reading electrochemical detectors to identify whether the concentration of hydrogen sulfide gas exceeds the maximum allowable concentration (MAC) or other limits. (astm.org)
  • These detectors are designed so that the current value change in the sensor is related to the concentration of hydrogen sulfide under conditions of sampling speed specified by the manufacturer," says ASTM International member Wei Xinming, of Qingdao Safety Engineering Institute, SINOPEC, in Qingdao, China. (astm.org)
  • At high temperatures or in the presence of catalysts, sulfur dioxide reacts with hydrogen sulfide to form elemental sulfur and water. (wikipedia.org)
  • Hydrogen sulfide reacts with metal ions to form metal sulfides, which are insoluble, often dark colored solids. (wikipedia.org)
  • When iron sulfide reacts with diluted sulfuric acid, hydrogen sulfide is formed which is collected in the gas jar by upward displacement of air. (wikipedia.org)
  • Sodium hypochlorite reacts readily with hydrogen sulfide to convert the sulfide ion into free sulfur in a neutral or acid solution and to the sulfate ion in an alkaline solution. (unt.edu)
  • Exposure to hydrogen sulfide and ammonia during the production and handling of mushroom compost can be deadly. (worksafebc.com)
  • Ammonia is a compound of nitrogen and hydrogen, but it cannot be formed by the direct union of these gases. (dictionary.com)
  • LGR's H 2 S/NH 3 Analyzer (ammonia, hydrogen sulfide) provides sensitive measurements in ambient air or in industrial process flows with extremely high precision and sensitivity. (pollutiononline.com)
  • Sulfur-reducing bacteria (such as Salmonella ) and some archaea obtain their energy by oxidizing organic matter or hydrogen with elemental sulfur , also producing H 2 S. Other anaerobic bacteria liberate hydrogen sulfide when they digest sulfur-containing amino acids , for instance during the decay of organic matter. (newworldencyclopedia.org)
  • or an acidic or corrosive agent such as hydrogen sulfide, .Stress Corrosion Cracking (Corrosion Fatigue) 11. (github.com)
  • In the US, we are seeing an increase in upsets at refineries using highly corrosive gases, like hydrogen sulphide. (ecojustice.ca)
  • Solutions of sulfide salts are corrosive. (wikipedia.org)
  • Sulfur dioxide preservatives in dried fruit, sulfites in wine, and the putrefaction of undigested animal protein in the colon can release hydrogen sulfide, the rotten egg gas associated with inflammatory bowel disease. (nutritionfacts.org)
  • Hydrogen sulfide occurs naturally in crude petroleum, natural gas, volcanic gases, and hot springs. (cdc.gov)
  • Hydrogen sufide testing of crude oil, petroleum products, chemicals and gases. (intertek.com)
  • Hydrogen sulfide forms a complex bond to the ferric moiety causing inhibition of mitochondrial cytochrome oxidase (iron-containing protein), thereby arresting aerobic metabolism in an effect similar to cyanide toxicity. (medscape.com)
  • hydrogen sulphide Colourless, poisonous gas (H 2 S) with the smell of bad eggs. (encyclopedia.com)
  • Some evidence suggests that hydrogen sulfide produced by sulfate-reducing bacteria in the colon may cause or contribute to ulcerative colitis. (newworldencyclopedia.org)
  • The sulfide anion S2− is not formed in aqueous solution. (wikipedia.org)
  • Sulfide (British English also sulphide) is an inorganic anion of sulfur with the chemical formula S2− or a compound containing one or more S2− ions. (wikipedia.org)
  • Hydrogen sulfide is heavier than air and will settle into low areas. (worksafebc.com)
  • Hydrogen sulfide (H2S) gas is normally heavier than air, but when agitated, it can erupt from the confines of the pipe in levels of toxicity which paralyze the lungs. (swopnet.com)
  • Sulfides present in aqueous solution are responsible for stress corrosion cracking (SCC) of steel, and is also known as sulfide stress cracking. (wikipedia.org)
  • Methane (chemical formula CH4) is one of the simplest hydrocarbons, which literally means "containing hydrogen and carbon. (dictionary.com)
  • Hydrogen sulphide and methane emissions on the central Namibian shelf. (nasa.gov)
  • In 2017, 646 single exposures to hydrogen sulfide exposure were reported to Poison Control Centers in the United States. (medscape.com)
  • Inhalation of hydrogen sulfide (H 2 S) has been shown to trigger a hibernation-like state in mice characterized by a reduction in activity and metabolism. (ahajournals.org)
  • this produces hydrogen sulfide as a waste product. (wikipedia.org)
  • However, it's now emerging that the body actually produces hydrogen sulfide by specific enzymes and, as more researchers become interested in this gas, we are finding changes in hydrogen sulfide synthesis or changes in how hydrogen sulfide is used by the body. (heraldnet.com)
  • The Bechtel hydrogen sulfide production unit produces a high-quality hydrogen sulfide product from hydrogen and liquid sulfur. (bechtel.com)
  • High manganese dioxide content and purity produces a much more active oxidation-reduction reaction and filtration process to effectively reduce iron, hydrogen sulfide and manganese better than Greensand and Birm. (freedrinkingwater.com)
  • The hydrogen sulfide breakthrough indicator produces vivid colour changes from light blue to black when filter is saturated and exhausted. (industrysearch.com.au)
  • If workers smell the distinctive rotten egg odour of hydrogen sulfide, they should leave the area immediately and contact a supervisor. (worksafebc.com)
  • P. K. Moore, M. Bhatia, and S. Moochhala, "Hydrogen sulfide: from the smell of the past to the mediator of the future? (hindawi.com)
  • With regards to hydrogen sulfide, this common water pollutant does not pose a health risk but it does give water an unpleasant "rotten egg" smell and taste. (freedrinkingwater.com)
  • Hydrogen sulfide as a gasotransmitter. (nih.gov)
  • Recent studies have implicated hydrogen sulfide (H2S) as a new member of vasculoprotective gasotransmitter family, behaving similarly to NO and CO. H2S has been demonstrated to inhibit multiple key aspects of atherosclerosis, including atherogenic modification of LDL, monocytes adhesion to the endothelial cells, macrophage-derived foam cell formation and inflammation, smooth muscle cell proliferation, neointimal hyperplasia, vascular calcification, and thrombogenesis. (nih.gov)
  • Gasotransmitter hydrogen sulphide (H 2 S) has emerged as a regulator of multiple physiological and pathophysiological processes throughout. (springer.com)
  • Hydrogen sulfide (H 2 S) is produced by cystathionine-γ lyase (CSE), and a potential gasotransmitter that has many positive cardiovascular effects including regulation of monocyte functions. (ahajournals.org)
  • Warn other of the presence of the colorless gas with bold and stinking Hydrogen Sulfide Chemical Safety Signs. (mysafetysign.com)
  • a new role for endogenous hydrogen sulphide? (hindawi.com)
  • 2020) Endogenous hydrogen sulfide maintains eupnea in an in situ arterially perfused preparation of rats. (news-medical.net)
  • Bacteria found in your mouth and digestive tract produce hydrogen sulfide during the digestion of food containing vegetable or animal proteins. (cdc.gov)
  • In soil, hydrogen sulfide will be consumed by bacteria and changed to sulfur. (cdc.gov)
  • One possible exception is the development of small molecule drugs that prevent bacteria from generating hydrogen sulfide. (genengnews.com)
  • Hydrogen sulfide, it happens, is critical to the innate ability of bacteria to survive normally lethal levels of antibiotics. (genengnews.com)
  • To deprive bacteria of hydrogen sulfide, scientists based at New York University (NYU) targeted the bacterial enzyme called cystathionine γ-lyase (CSE). (genengnews.com)
  • We thought that hydrogen sulfide may be the end product, but it had never been proven before, and no one knew which bacteria and enzymes may catalyse these reactions", the biologist says. (innovations-report.com)
  • Are you saying that Detritus will collect in the shells and therefore grow nasty bacteria that gives off Hydrogen Sulphide. (actwin.com)
  • To the knowledge of the authors, this is the first study to determine the growth rate of bacteria involved in concrete corrosion with hydrogen sulfide as source of reduced sulfur. (wur.nl)
  • Microbially-induced corrosion (MIC) or biogenic sulfide corrosion are also caused by sulfate reducing bacteria producing sulfide that is emitted in the air and oxidized in sulfuric acid by sulfur oxidizing bacteria. (wikipedia.org)
  • Produced in small amounts by some cells of the mammalian body, hydrogen sulfide functions as a vasodilator and is also active in the brain . (newworldencyclopedia.org)
  • Nicholson RA, Roth SH, Zhang A, Zheng J, Brookes J, Skrajny B, Bennington R (1998) Inhibition of respiratory and bioenergetic mechanisms by hydrogen sulfide in mammalian brain. (springer.com)
  • Hydrogen sulfide can also be released from industrial sources such as petroleum refineries, natural gas plants, kraft paper mills, manure treatment facilities, waste water treatment facilities, and tanneries. (cdc.gov)
  • Hydrogen sulfide is used in the petroleum, rubber, and mining industries, and in making sulfur. (dictionary.com)
  • Hydrogen sulfide most often is encountered as a byproduct of the petroleum, viscose rayon, rubber, and mining industries. (medscape.com)
  • [ 1 ] The petroleum industry is responsible for most cases of hydrogen sulfide toxicity in North America. (medscape.com)
  • Small amounts of hydrogen sulfide occur in crude petroleum, but natural gas can contain up to 90 percent. (newworldencyclopedia.org)
  • By far the largest industrial route to H 2 S occurs in petroleum refineries: The hydrodesulfurization process liberates sulfur from petroleum by the action of hydrogen. (newworldencyclopedia.org)
  • Hydrogen sulfide is a mitochondrial toxin and inhibits cytochrome-aa(3) and prevents cellular aerobic metabolism. (nih.gov)
  • She discovered a new type of metabolism that transforms sulfoquinovose into hydrogen sulfide (H2S). (innovations-report.com)
  • Very recently, a third endogenously produced gaseous signaling molecule, hydrogen sulfide (H 2 S), has emerged as a potentially important mediator of CV homeo stasis and cytoprotection ( 3 ). (pnas.org)
  • Hydrogen sulfide (H 2 S) recently emerged as an important gaseous signaling molecule in plants. (frontiersin.org)
  • [ 2 ] In addition to deaths, at least 80% of hydrogen sulfide suicides "have resulted in injuries to police officers, firefighters, emergency workers or civilians exposed to the gas. (medscape.com)
  • Suicide fads: frequency and characteristics of hydrogen sulfide suicides in the United States. (medscape.com)
  • Studies in humans suggest that the respiratory tract and nervous system are the most sensitive targets of hydrogen sulfide toxicity. (cdc.gov)
  • Low-level exposures to hydrogen sulfide usually produce local eye and mucous membrane irritation, while high-level exposures rapidly produce fatal systemic toxicity. (medscape.com)
  • Based on the similarities in cyanide and hydrogen sulfide toxicity, induced methemoglobinemia may be used in hydrogen sulfide toxicity. (medscape.com)
  • Hydrogen Sulfide-Mechanisms of Toxicity and Development of an Antidote. (medscape.com)
  • The goal of both the EPA and DHEC Orders is for the site to continue to identify sources of hydrogen sulfide emissions and ways to reduce them. (scdhec.gov)
  • Investigation into Testing and Controlling Emissions of Hydrogen Sulfide from Gasoline Vehicles," SAE Technical Paper 2001-01-3530, 2001, https://doi.org/10.4271/2001-01-3530 . (sae.org)
  • Arizona Instrument manufactures the Jerome line of Hydrogen Sulfide and Mercury Vapor Analyzers as well as Computrac Moisture Analyzers. (prlog.org)
  • Amorphous molybdenum sulfide films are highly active hydrogen evolution catalysts, say researchers from Switzerland. (rsc.org)
  • A hydrogen sulfide sensor or H2S sensor is a gas sensor for the measurement of hydrogen sulfide. (wikipedia.org)
  • Any hydrogen sulphide in the sample is absorbed by the sensor, which registers a proportional change in electrical resistance. (ferret.com.au)
  • 6. A method of coating an electrode for use in a hydrogen sulfide sensor according to claim 4 wherein R is 1-ethylpentyl. (google.com)
  • The sorption media on top of the indicators sensor protect it from possible exposure to traces of hydrogen sulfide that might exist in the surrounding environment. (industrysearch.com.au)
  • The colormetric sensor is also selective to hydrogen sulfide gas. (industrysearch.com.au)
  • We want to develop treatments to help treat and/or prevent cardiovascular disease by capitalizing on this hydrogen sulfide pathway. (news-medical.net)
  • For example, the thioether dimethyl sulfide is CH3-S-CH3. (wikipedia.org)
  • Exposure to hydrogen sulfide may cause irritation to the eyes and respiratory system. (cdc.gov)
  • Workers may be harmed from exposure to hydrogen sulfide. (cdc.gov)
  • The following resources provide information about occupational exposure to hydrogen sulfide. (cdc.gov)
  • Contains a standard for mitigation of exposure to hydrogen sulfide to prevent adverse effects over a working lifetime. (cdc.gov)
  • NIOSH Criteria Documents: Criteria for a Recommended Standard: Occupational Exposure to Hydrogen Sulfide -DHHS (NIOSH) Publication No. 77-158. (cdc.gov)
  • This information is important because these future sites may be sources of exposure, and exposure to hydrogen sulfide may be harmful. (cdc.gov)
  • Useful search terms for hydrogen sulfide include "hydrosulfuric acid," "sewer gas," and "sulfuretted hydrogen. (cdc.gov)
  • Hydrogen sulfide oxidation by microbes present on concrete surfaces of sewer pipes is a key process in sewer corrosion. (wur.nl)
  • The proposed standard ( WK59402 , Test Methods for Measurement of Hydrogen Sulfide in Workplace Air by Direct-Reading Electrochemical Detectors) is being developed by the ASTM International committee on air quality ( D22 ). (astm.org)
  • The measurement of sulfide, especially hydrogen sulfide, has held the attention of the analytical community due to its unique physiological and pathophysiological roles in biological systems. (rsc.org)
  • Initial treatment of hydrogen sulfide exposure requires immediate removal of the victim from the contaminated area into a ventilated/fresh-air environment. (medscape.com)
  • The IRON-HYDRO is capable of handling up to 10 ppm iron, 3 ppm hydrogen sulfide, and 5 ppm manganese without the use of additional oxidizers and can be operated within a broad pH range without adding additional pH amendment to the iron removal. (freedrinkingwater.com)
  • In the second group, 12 rats received a single intravenous dose of sulfide solution about 20 minutes after the initiation of blood removal while seven served as controls. (webwire.com)
  • This conversion process makes calytic activated carbon the most effective media available for the removal of chloramines and hydrogen sulfide from water supplies. (freedrinkingwater.com)
  • Occurrence of long-term neurologic sequelae from hydrogen sulfide exposure is unknown but appears to be linked to longer sublethal exposures. (medscape.com)
  • This newly developed program meets the academic training requirements for those persons who work in an area with potential hydrogen sulfide exposures. (safety-video-bmsh.com)