Radiology Information Systems: Information systems, usually computer-assisted, designed to store, manipulate, and retrieve information for planning, organizing, directing, and controlling administrative activities associated with the provision and utilization of radiology services and facilities.Oxygen: An element with atomic symbol O, atomic number 8, and atomic weight [15.99903; 15.99977]. It is the most abundant element on earth and essential for respiration.Consumer Product SafetyOxygen Consumption: The rate at which oxygen is used by a tissue; microliters of oxygen STPD used per milligram of tissue per hour; the rate at which oxygen enters the blood from alveolar gas, equal in the steady state to the consumption of oxygen by tissue metabolism throughout the body. (Stedman, 25th ed, p346)Adsorption: The adhesion of gases, liquids, or dissolved solids onto a surface. It includes adsorptive phenomena of bacteria and viruses onto surfaces as well. ABSORPTION into the substance may follow but not necessarily.Advertising as Topic: The act or practice of calling public attention to a product, service, need, etc., especially by paid announcements in newspapers, magazines, on radio, or on television. (Random House Unabridged Dictionary, 2d ed)DNA Viruses: Viruses whose nucleic acid is DNA.Deception: The act of deceiving or the fact of being deceived.Reactive Oxygen Species: Molecules or ions formed by the incomplete one-electron reduction of oxygen. These reactive oxygen intermediates include SINGLET OXYGEN; SUPEROXIDES; PEROXIDES; HYDROXYL RADICAL; and HYPOCHLOROUS ACID. They contribute to the microbicidal activity of PHAGOCYTES, regulation of signal transduction and gene expression, and the oxidative damage to NUCLEIC ACIDS; PROTEINS; and LIPIDS.Radiotherapy Planning, Computer-Assisted: Computer-assisted mathematical calculations of beam angles, intensities of radiation, and duration of irradiation in radiotherapy.Encyclopedias as Topic: 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)Food Inspection: Examination of foods to assure wholesome and clean products free from unsafe microbes or chemical contamination, natural or added deleterious substances, and decomposition during production, processing, packaging, etc.Famous PersonsLiterature, ModernSocial Media: Platforms that provide the ability and tools to create and publish information accessed via the INTERNET. Generally these platforms have three characteristics with content user generated, high degree of interaction between creator and viewer, and easily integrated with other sites.Love: Affection; in psychiatry commonly refers to pleasure, particularly as it applies to gratifying experiences between individuals.MedlinePlus: NATIONAL LIBRARY OF MEDICINE service for health professionals and consumers. It links extensive information from the National Institutes of Health and other reviewed sources of information on specific diseases and conditions.Blogging: Using an INTERNET based personal journal which may consist of reflections, comments, and often hyperlinks.Copper: A heavy metal trace element with the atomic symbol Cu, atomic number 29, and atomic weight 63.55.Electric Power Supplies: Devices that control the supply of electric current for running electrical equipment.Bioelectric Energy Sources: Electric power supply devices which convert biological energy, such as chemical energy of metabolism or mechanical energy of periodic movements, into electrical energy.Electricity: The physical effects involving the presence of electric charges at rest and in motion.Lanthanum: Lanthanum. The prototypical element in the rare earth family of metals. It has the atomic symbol La, atomic number 57, and atomic weight 138.91. Lanthanide ion is used in experimental biology as a calcium antagonist; lanthanum oxide improves the optical properties of glass.Electrodes: Electric conductors through which electric currents enter or leave a medium, whether it be an electrolytic solution, solid, molten mass, gas, or vacuum.Strontium: An element of the alkaline earth family of metals. It has the atomic symbol Sr, atomic number 38, and atomic weight 87.62.Cobalt: A trace element that is a component of vitamin B12. It has the atomic symbol Co, atomic number 27, and atomic weight 58.93. It is used in nuclear weapons, alloys, and pigments. Deficiency in animals leads to anemia; its excess in humans can lead to erythrocytosis.Geobacter: A genus of gram-negative, anaerobic, metal-reducing bacteria in the family Geobacteraceae. They have the ability to oxidize a variety of organic compounds, including AROMATIC HYDROCARBONS.Graphite: An allotropic form of carbon that is used in pencils, as a lubricant, and in matches and explosives. It is obtained by mining and its dust can cause lung irritation.Music: Sound that expresses emotion through rhythm, melody, and harmony.Malus: A plant genus in the family ROSACEAE, order Rosales, subclass Rosidae. It is best known as a source of the edible fruit (apple) and is cultivated in temperate climates worldwide.Plant Nectar: Sugar-rich liquid produced in plant glands called nectaries. It is either produced in flowers or other plant structures, providing a source of attraction for pollinating insects and animals, as well as being a nutrient source to animal mutualists which provide protection of plants against herbivores.Music Therapy: The use of music as an adjunctive therapy in the treatment of neurological, mental, or behavioral disorders.Erwinia amylovora: A species of gram-negative bacteria, in the genus ERWINIA, causing a necrotic disease of plants.Viscum album: A plant species of the family VISCACEAE, order Santalales, subclass Rosidae. This is the traditional mistletoe of literature and Christmas. Members contain viscotoxin (5 kDa basic polypeptides related to thionins), beta-galactoside- and N-acetyl-D-galactosamine-specific lectin II (60 kDa), and polysaccharides. Mistletoe lectin I is a type 2 ribosome-inactivating protein. Commercial extracts include Plenosol, Eurixor, Helixor Isorel, Iscador, and NSC 635089 (ANTINEOPLASTIC AGENTS, PHYTOGENIC).Chenopodium album: A plant species in the CHENOPODIUM genus known for edible greens.Pyrus: A plant genus of the family ROSACEAE known for the edible fruit.Plant Diseases: Diseases of plants.

Arterial blood gas tensions during upper gastrointestinal endoscopy. (1/22785)

Arterial blood gas tensions were measured before and during upper gastrointestinal endoscopy, with (group I) and without (group 2) sedation with intravenous diazepam. There was a highly significant fall in the PaO2, which occurred in both groups and was therefore not attributable to diazepam. Measurement of FEV, and FVC before endoscopy had no predictive value for those patients whose PaO2 fell the most.  (+info)

In vitro development of sheep preantral follicles. (2/22785)

Preantral ovarian follicles isolated from prepubertal sheep ovaries were individually cultured for 6 days in the presence of increasing doses of FSH (ranging from 0.01 to 1 microg/ml) and under two different oxygen concentrations, 20% and 5% O2. Follicle development was evaluated on the basis of antral cavity formation as well as the presence of healthy cumulus oocyte complexes. Follicle growth was enhanced by FSH addition to culture medium, while the use of a low oxygen concentration slightly stimulated this process. However, when follicles were cultured in the presence of high doses of FSH (1 microgram/ml) and under low oxygen concentration, a high proportion of them showed the presence of an antral cavity and of a healthy cumulus-oocyte complex. In addition, under this specific culture condition sheep preantral follicles released higher levels of estradiol as compared to those secreted at lower FSH concentrations or under 20% O2. When the meiotic competence of oocytes derived from follicles cultured at 1 microgram/ml FSH was assessed, no significant difference was recorded between the two oxygen groups. These results show that the culture conditions here identified are beneficial to in vitro growth and differentiation of sheep preantral follicles.  (+info)

Endogenous plasma endothelin concentrations and coronary circulation in patients with mild dilated cardiomyopathy. (3/22785)

OBJECTIVE: To determine whether increased plasma concentrations of endothelin-1 (ET-1) and big endothelin (BET) play a role in the regulation of coronary circulation in patients with idiopathic dilated cardiomyopathy (IDCM). SETTING: Tertiary referral centre for cardiac diseases. PATIENTS: Fourteen patients (eight male/six female; mean (SD) age 59 (9) years) with IDCM (ejection fraction 36 (9)%) and five normotensive subjects (two male/three female; age 52 (7) years) serving as controls were studied. METHODS: Functional status was classified according to New York Heart Association (NYHA) class. Endogenous ET-1 and BET plasma concentrations from the aorta and the coronary sinus were determined by radioimmunoassay. Coronary blood flow, using the inert chromatographic argon method, myocardial oxygen consumption, and coronary sinus oxygen content under basal conditions were determined. RESULTS: In the aorta, mean (SD) concentrations of ET-1 (IDCM 0.76 (0.25) v controls 0.31 (0.06) fmol/ml; p = 0.002) and BET (IDCM 3.58 (1.06) v controls 2.11 (0.58) fmol/ml; p = 0.014) were increased in patients with IDCM. Aortic ET-1 concentrations correlated positively with NYHA class (r = 0. 731; p < 0.001), myocardial oxygen consumption (r = 0.749; p < 0. 001), and coronary blood flow (r = 0.645; p = 0.003), but inversely with coronary sinus oxygen content (r = -0.633; p = 0.004), which was significantly decreased in IDCM patients (IDCM 4.68 (1.05) v controls 6.70 (1.06) vol%; p = 0.003). CONCLUSIONS: The coronary circulation in patients with IDCM is exposed to an increased endothelin load. ET-1 concentrations correlate with functional deterioration. A decrease of the coronary sinus content of oxygen suggests a mismatch between coronary blood flow and metabolic demand. Thus, ET-1 might be a marker of a disequilibrium between myocardial oxygen demand and coronary blood flow in IDCM.  (+info)

Quantification of tumour vasculature and hypoxia by immunohistochemical staining and HbO2 saturation measurements. (4/22785)

Despite the possibility that tumour hypoxia may limit radiotherapeutic response, the underlying mechanisms remain poorly understood. A new methodology has been developed in which information from several sophisticated techniques is combined and analysed at a microregional level. First, tumour oxygen availability is spatially defined by measuring intravascular blood oxygen saturations (HbO2) cryospectrophotometrically in frozen tumour blocks. Second, hypoxic development is quantified in adjacent sections using immunohistochemical detection of a fluorescently conjugated monoclonal antibody (ELK3-51) to a nitroheterocyclic hypoxia marker (EF5), thereby providing information relating to both the oxygen consumption rates and the effective oxygen diffusion distances. Third, a combination of fluorescent (Hoechst 33342 or DiOC7(3)) and immunohistological (PECAM-1/CD31) stains is used to define the anatomical vascular densities and the fraction of blood vessels containing flow. Using a computer-interfaced microscope stage, image analysis software and a 3-CCD colour video camera, multiple images are digitized, combined to form a photo-montage and revisited after each of the three staining protocols. By applying image registration techniques, the spatial distribution of HbO2 saturations is matched to corresponding hypoxic marker intensities in adjacent sections. This permits vascular configuration to be related to oxygen availability and allows the hypoxic marker intensities to be quantitated in situ.  (+info)

The respiratory responses of Carcinus maenas to declining oxygen tension. (5/22785)

The degree of respiratory independence shown by Carcinus under conditions of declining oxygen tension is dependent on the animal's level of activity. Inactive Carcinus are capable of maintaining respiratory independence down to a Po2 of 60-80 mmHg. This is achieved primarily by an increase in ventilation volume such that the amount of oxygen made available at the respiratory surfaces remains constant over a wide range of oxygen tension. The Po2 at which this can no longer be maintained corresponds closely to the Po2 at which respiratory independence is lost. Under normoxic conditions the Po2 of the post- and prebranchial blood was 97 and 18 mmHg respectively. At the high oxygen tensions prevailing in the postbranchial blood the respiratory pigment is fully saturated. Under conditions of declining oxygen tension the heart rate remains more or less constant until the Po2 reaches 60-80 mmHg, the onset of bradycardia coinciding with the loss of saturation of the haemocyanin. Although cardiac output falls during hypoxia, the capacity rate ratio remains approximately constant, which enables the effectiveness of oxygen uptake by the blood to remain at a high level.  (+info)

Active transport of calcium across the isolated midgut of Hyalophora cecropia. (6/22785)

1. The net flux of 45Ca from lumen to blood side across the isolated and short-circuited Cecropia midgut was 1-9 +/- 0-2 muequiv. cm-2h-1 in 8 mM Ca and the flux ratio was as high as 56 to 1. 2. The calcium influx was depressed by anoxia; 73% after 30 min. 3. The kinetics of Ca transport were anomalous; the apparent Km varied with Ca concentration from less than 0-2 to greater than 5-6 mM Ca and the apparent Vmax varied from less than 1-3 to greater than 3-3 muequiv. cm-2h-1. 4. The calcium influx showed a delay before the tracer steady state was attained, indicating the existence in the transport route of a calcium pool equivalent to 5-7 muequiv/g. wet weight of midgut tissue. 5 High calcium (16 mM) depressed the short-circuit current and potassium transport from blood to lumen side across the midgut. 6. Calcium depressed magnesium transport, from lumen to blood side across the midgut, and magnesium depressed the calcium transport. 7. Ca transport by the midgut does not regulate the Ca level in the haemolymph in vivo; it merely aids the diffusion of calcium down its electrochemical gradient. However, Ca transport may assist the uptake of the nutrients from the midgut contents.  (+info)

2,3 diphosphoglycerate in Parkinson's disease. (7/22785)

The red cell 2,3 DPG, the most important factor for oxygen delivery in the tissues, was found to be increased in Parkinsonism patients compared with controls. The aging process seems not to be a factor in the increased 2,3 DPG concentration. Other factors relevant to raised 2,3 DPG level such as physical activity, increased oxygen requirements, and metabolic changes are discussed.  (+info)

Nitric oxide inhibits cardiac energy production via inhibition of mitochondrial creatine kinase. (8/22785)

Nitric oxide biosynthesis in cardiac muscle leads to a decreased oxygen consumption and lower ATP synthesis. It is suggested that this effect of nitric oxide is mainly due to the inhibition of the mitochondrial respiratory chain enzyme, cytochrome c oxidase. However, this work demonstrates that nitric oxide is able to inhibit soluble mitochondrial creatine kinase (CK), mitochondrial CK bound in purified mitochondria, CK in situ in skinned fibres as well as the functional activity of mitochondrial CK in situ in skinned fibres. Since mitochondrial isoenzyme is functionally coupled to oxidative phosphorylation, its inhibition also leads to decreased sensitivity of mitochondrial respiration to ADP and thus decreases ATP synthesis and oxygen consumption under physiological ADP concentrations.  (+info)

*Copper toxicity

This bound form is thought to mediate the production of reactive oxygen species in the brain. Too much copper in water may ... Free copper normally reduces oxidative stress, as it is involved in the metabolic elimination of reactive oxygen species, such ...

*Oxygen permeability

... (OP) is a parameter of a contact lens that expresses the ability of the lens to let oxygen reach the eye by ... "Oxygen permeability". lenses-contact.co.uk. Oxygen Permeability of Contact Lenses Materials Dk values (See page 4). ... k being the solubility (ml O2/ml of material x mm Hg)--a measure of how much oxygen is contained in the material. Once again, ... The earliest models of soft contact lenses, based on hydrogel material, had a level of oxygen permeability of around 6-8 Dk/t. ...

*POL Oxygen

"POL Oxygen magazine". The Loop. Retrieved 10 November 2015. POL Oxygen magazine website Art direction by Marcus Piper. ... POL Oxygen was an international design, art and architecture quarterly magazine. The magazine existed between 2001 and 2008. It ...

*Project Oxygen

The Oxygen architecture is to consist of handheld terminals, computers embedded in the environment, and dynamically configured ... Project Oxygen is a research project at the Massachusetts Institute of Technology's Computer Science and Artificial ... Project Oxygen: Pervasive, Human-Centric Computing-An Initial Experience, Larry Rudolph, pp. 1-12, in Advanced Information ... Making computing as easy as breathing: MIT's Project Oxygen research shaping future of technology, Leslie Walker, San Francisco ...

*Oxygen (EP)

"Swans Confirm 'Oxygen' EP". Murray, Robin. Clash. October 20, 2014. Retrieved November 25, 2014. "Swans to release Oxygen EP of ... Oxygen EP at Swans' official Bandcamp page Oxygen EP on Young God Records' official website. ... Oxygen is an EP by American band Swans. It was released digitally on November 25, 2014, through Swans' official Bandcamp page. ... The EP features four different versions of the title track "Oxygen", originally from the band's 2014 album, To Be Kind. The ...

*Oxygen Thief

... is a solo musical project based in the city of Bristol. He has received national radio recognition and festival ... Oxygen Thief began in 2006. He has supported Frank Turner, Mongol Horde, InMe, Johnny Foreigner, Chris T-T, and Tubelord and is ... Having toured regularly with acts from their roster, Oxygen Thief signed to Xtra Mile Recordings, formed a 3 piece electric ... Oxygen Thief in session, accessed 28 June 2012 Safe Concerts announce 2012 BBC Introducing stage lineup at the T in the Park ...

*Oxygen mask

An oxygen mask provides a method to transfer breathing oxygen gas from a storage tank to the lungs. Oxygen masks may cover the ... These special oxygen bottles are filled with oxygen at a very high pressure which provides a longer time duration of oxygen for ... Oxygen helmets are often preferred for oxygen administration in hyperbaric oxygen chambers for children and patients that are ... Because they seal tightly, pressure-demand-type oxygen masks are also used in hyperbaric oxygen chambers and for oxygen ...

*Oxygen SpA

... is an Italian company that manufactures "green vehicles". They produce the Oxygen Electric Cargoscooter. Oxygen S.p. ... "Oxygen S p A Introduces Zero Emission Oxygen Electric CargoScooter to the UK". Material Handling World Magazine. [1] [2]. ... Oxygen provides electric scooters to a number of major delivery fleets. Swiss Post is one of the company's higher profile ... Oxygen's product is the all-electric CargoScooter, designed specifically for the delivery market and the first of its kind ...

*Oxygen-18

... (18 O) is a natural, stable isotope of oxygen and one of the environmental isotopes. 18 O is an important precursor ... In the study of plants' photorespiration, the labeling of atmosphere by oxygen-18 allows us to measure the oxygen uptake by the ... Large amounts of oxygen-18 enriched water are used in positron emission tomography centers, for on-site production of 18F- ... In the 1950s, Harold Urey performed an experiment in which he mixed both normal water and water with oxygen-18 in a barrel, and ...

*Oxygen: Inhale

... (stylized in all capitals as OXYGEN:INHALE) is the seventh studio album by Canadian rock band Thousand Foot ... "Oxygen:Inhale" Review". "Thousand Foot Krutch - «Oxygen: Inhale» / Sort Music Россия". "Thousand Foot Krutch". billboard.com. ... "Thousand Foot Krutch: Oxygen: Inhale on PledgeMusic". PledgeMusic. Retrieved June 2, 2014. "THOUSAND FOOT KRUTCH LAUNCHES FIRST ... Kirk, Logan (August 20, 2014). "Oxygen: Inhale by Thousand Foot Krutch Review". Bracket and Bracket. Retrieved August 20, 2014 ...

*Oxygen difluoride

2 for the oxygen atom instead of its normal −2. Above 200 °C, OF2 decomposes to oxygen and fluorine via a radical mechanism. ... Oxygen difluoride reacts very slowly with water to form hydrofluoric acid: OF2 (aq) + H2O (l) → 2 HF (aq) + O2 (g) OF2 + SO2 → ... Oxygen difluoride is the chemical compound with the formula OF2. As predicted by VSEPR theory, the molecule adopts a "bent" ... Oxygen difluoride was first reported in 1929; it was obtained by the electrolysis of molten potassium fluoride and hydrofluoric ...

*Oxygen therapy

Home oxygen can be provided either by oxygen tanks or an oxygen concentrator. Oxygen is believed to be the most common ... Long term oxygen is often useful in people with chronically low oxygen such as from severe COPD or cystic fibrosis. Oxygen can ... Demand oxygen delivery systems (DODS) or oxygen resuscitators deliver oxygen only when the person inhales, or, in the case of a ... Other designs include the ISO-O 2 oxygen mask, the Flo2Max oxygen mask, and the O-Mask. The use of oxygen masks that are ...

*Oxygen concentrator

Non-medical oxygen concentrators can be used as a feed gas to a medical oxygen system, such as the oxygen system in a hospital ... The term, oxygen generator, is a misnomer in that the oxygen is not generated as it is with a chemical oxygen generator, but ... An oxygen concentrator is a device which concentrates the oxygen from a gas supply (typically ambient air) to supply an oxygen- ... Industrial oxygen concentrators are sometimes referred to as oxygen generators within the oxygen and ozone industries to ...

*Oxygen plant

"Membrane oxygen plants - Technical Characteristics". Retrieved 2013-09-18. Oxygen and Nitrogen Gas Plant System oxygen plant ... based oxygen plants is the low cost of oxygen produced in the cases where there are no rigid requirements to the product oxygen ... Where gaseous oxygen purity is required at the level of 90-95% with the capacity of up to 5,000 Nm3 per hour, adsorption oxygen ... The adsorption oxygen plants produce 5 to 5,000 Nm3/h of oxygen with a purity of 93-95%. These systems, designated for indoor ...

*Singlet oxygen

The terms 'singlet oxygen' and 'triplet oxygen' refer to the quantum state of the molecules: singlet oxygen exists in the ... The NIST webbook on oxygen Photochemistry & Photobiology tutorial on Singlet Oxygen Demonstration of the Red Singlet Oxygen ... Singlet oxygen is a high-energy form of oxygen. A gas with the formula O2, its physical properties differ only subtly from ... Various methods for the production of singlet oxygen exist. Irradiation of oxygen gas in the presence of an organic dye as a ...

*Oxygen (horse)

Oxygen's Oaks was the last of twenty classic wins for her owner George FitzRoy, 4th Duke of Grafton. Oxygen was regarded the ... Weatherby (1857). "Oxygen". The General Stud Book. 6: 144. "Oxygen pedigree". equineline.com. 2012-05-08. Retrieved 2012-11-02 ... leaving Oxygen to walk over the course to claim the prize money. Three days later in the 1000 Guineas Oxygen was made the ... at least a stone inferior to Oxygen at her best. On 20 May Oxygen started at odds of 12/1 for the Oaks Stakes over one and a ...

*Oxygen-17

... is a low-abundant, natural, stable isotope of oxygen (0.0373% in seawater; approximately twice as abundant as ... Some tritium removal facilities make a point of replacing the oxygen of the water with natural oxygen (mostly 16O) to give the ... "Cerebral Oxygen Utilization Analyzed by the Use of Oxygen-17 and its Nuclear Magnetic Resonance". Biochem. Biophys. Res. Commun ... "Biological oxygen productivity during the last 60,000 years from triple oxygen isotope measurements". Global Biogeochemical ...

*Oxygen toxicity

Since the late 1990s the recreational use of oxygen has been promoted by oxygen bars, where customers breathe oxygen through a ... Higher than normal concentrations of oxygen lead to increased levels of reactive oxygen species. Oxygen is necessary for cell ... It is also known as oxygen toxicity syndrome, oxygen intoxication, and oxygen poisoning. Historically, the central nervous ... oxygen. Divers who breathe oxygen fractions greater than of air (21%) need to be trained in the dangers of oxygen toxicity and ...

*Oxygen evolution

... is the process of generating molecular oxygen through chemical reaction. Mechanisms of oxygen evolution ... Free oxygen is generated as a by-product of this reaction, and is released into the atmosphere. Photosynthetic oxygen evolution ... Oxygen evolution occurs as a byproduct of hydrogen production via electrolysis of water. While oxygen production is not the ... Photosynthetic oxygen evolution is the fundamental process by which breathable oxygen is generated in earth's biosphere. The ...

*Oxygen pulse

... is a physiological term for oxygen uptake per heartbeat at rest. Åstrand et al., "Textbook of Work Physiology", ...

*Oxygen firebreak

The fitting of firebreaks is therefore a requirement irrespective of the oxygen source, including oxygen concentrators, oxygen ... Oxygen firebreaks are fitted into the oxygen delivery tubing close to the patient, typically around the patient's sternum where ... Most home oxygen fires are caused by patients smoking whilst using medical oxygen. Despite the inherent dangers, researchers ... The status of home oxygen service providers under EU regulation and the legal requirement to fit oxygen firebreaks. BPR Medical ...

*Anomalous oxygen

... is hot atomic and singly ionized oxygen believed to be present in Earth's exosphere above 500 km near the ... Anomalous oxygen densities are included in the NRLMSISE-00 models of Earth's atmosphere. Keating, G. M., J. C. Leary, B. D. ...

*Oxygen Project

The name Oxygen came from a joke between the developers that they wanted to "bring a breath of fresh air to the desktop". On ... The Oxygen Project is a project created to give a visual refresh to KDE Plasma Workspaces. It consists of a set of computer ... The Oxygen Project aims to offer standard icons, guidelines and a style guide. It builds on the freedesktop.org Standard Icon ... The Oxygen theme set is used by default for Plasma Workspaces in most Linux distributions, like Fedora, Kubuntu, and openSUSE. ...

*Oxygen regulation

... can refer to: The physiological regulation of oxygen in plants and animals. See Control of respiration. The ...

*Oxygen fluoride

An oxygen fluoride is a compound containing only the chemical elements oxygen and fluorine. Three are known: Oxygen difluoride ...
What should my oxygen saturation level be?. A range of 94-99% is normal for healthy adults breathing room air which contains 21% oxygen. Anyone who is not achieving the critical blood oxygen saturation level of 90% (SpO2) or of 55-60mmHg (SaO2), may require additional oxygen. A qualified medical practitioner will assess your situation and prescribe the appropriate dose of supplemental oxygen.. Oxygen saturation levels - what do they mean?. Oxygen saturation levels measure the degree to which the haemoglobin contained in the red blood cells (erythrocytes) has bonded with oxygen molecules. Oxygen is taken in by the lungs when we breathe in.. The two most common ways of assessing the saturation of oxygen in the blood are arterial blood gases (ABG) and pulsatile oxygen.. What does an ABG measure?. An ABG test measures how efficiently your lungs are bringing oxygen into the blood stream and removing carbon dioxide. Arterial blood gases are taken from an artery usually on the wrist. This procedure can ...
Background: Lipid peroxidation induced by oxygen free radicals plays a prominent role in myocardial injury after global ischemia. The present study investigated whether ventilation with lower concentration of inspired oxygen would decrease the severity of myocardial lipid peroxidation and post resuscitation myocardial dysfunction.. Methods: Ventricular fibrillation was induced and untreated for 8 mins in 46 male Sprague-Dawley rats. Defibrillation was attempted after 8 mins of CPR. The animals were randomized into 3 groups: mechanical ventilation with 100% O2, 50% O2 or 21% O2 during CPR and one hr following return of spontaneous circulation. Normoxic ventilation was maintained thereafter. The level of 8-iso-Prostaglandin F2α (8-iso-PGF2α) in myocardium was evaluated using the enzyme-linked immunosorbent assay (ELISA). Blood gases, post resuscitation myocardial function and the duration of survival were monitored in all animals.. Results: Compared with the 100% and 21% groups, the 50% group ...
Effects of oxygen tension on vascular and other smooth muscle: 1. The resting tension of various isolated intestinal and vascular smooth muscle preparations var
Study Design. This will be a multi-center, prospective, double-blind clinical trial of physiologic (5%) oxygen tension in culture media vs. standard of care, atmospheric (SOC, 20%) oxygen tension with 840 eligible couples recruited to participate. The randomization scheme will be coordinated through the central data coordinating center (DCC-Yale) and the randomization will be stratified by age group of the woman (18-34, 35-37, 38-40 and 40-42) and each participating site.. Treatment. Couples will be randomized to either have their gametes and embryos placed in a physiologic (5%) oxygen atmosphere or in the currently widely used atmospheric (20%) oxygen atmosphere. ...
During pregnancy, oxygen diffuses from maternal to fetal blood through villous trees in the placenta. In this paper, we simulate blood flow and oxygen transfer in feto-placental capillaries by converting three-dimensional representations of villous and capillary surfaces, reconstructed from confocal laser scanning microscopy, to finite-element meshes, and calculating values of vascular flow resistance and total oxygen transfer. The relationship between the total oxygen transfer rate and the pressure drop through the capillary is shown to be captured across a wide range of pressure drops by physical scaling laws and an upper bound on the oxygen transfer rate. A regression equation is introduced that can be used to estimate the oxygen transfer in a capillary using the vascular resistance. Two techniques for quantifying the effects of statistical variability, experimental uncertainty and pathological placental structure on the calculated properties are then introduced. First, scaling arguments are used to
Assessment of language lateralization is essential in surgical planning, for the preservation of the language area and estimation of possible functional loss after surgery. Trancranial Doppler Sonography (TCD) is one of the techniques used in the assessment of language lateralization. Relative change of blood flow velocity (BFV) in the middle cerebral arteries (MCA) has been measured for the determination of language lateralization. Any non-neural factor such as increased inspired oxygen concentration may change the lateralization assessment result. Vasoconstrictive effect of oxygen causes the reduction of BFV, which is opposite to the increase of BFV under the influence of language stimuli. The purpose of this project was to investigate the effect of oxygen on BFV of the MCA, and to investigate the influence of increased inspired oxygen concentration on the result of language lateralization assessment. In order to study how the inspired oxygen concentration affects the language lateralization ...
Oxygen Sensitivity of Anammox and Coupled N-Cycle Processes in Oxygen Minimum Zones. . 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.
A set of equations governing oxygen diffusion and consumption in soils has been developed to include microbial and plant-root sinks. The dependent variable is the transformed oxygen concentration, which is the difference between the gaseous concentration and a scaled value of the aqueous oxygen concentration at the root-soil interface. The results show how, as the air-filled porosity decreases, the reduced oxygen flux causes the depth of extinction to decrease. The results also show how the depth of extinction at a particular value of soil water content decreases with increasing temperature, due to increased microbial respiration. The critical value of water content at which the oxygen concentration goes to extinction at a finite depth was compared with alternative calculations with only a microbial sink. By ignoring the feedback of oxygen concentration on root uptake, the alternative calculations yielded substantially higher critical values of water content at all temperatures. Two soil oxygen ...
Bedside catheterization of the right heart with a percutaneously introduced flowdirected catheter was carried out in 24 critically ill patients; 71 determinations of mixed venous oxygen saturation (MVo2) were obtained. A second catheter was inserted either into a central intrathoracic vein or the right atrium for simultaneous sampling of central venous (CVo2) or right atrial (RAo2) oxygen saturation.. For the group as a whole, mean CVo2 (57.9% ± 15.25) was significantly greater than mean MVo2 (53.3% ± 14.84) (P,0.001), but there was no significant difference and correlation was good between changes in central venous compared to changes in mixed venous oxygen saturation. On the other hand, there was no significant mean difference as well as an excellent correlation between individual values of RAo2 and MVo2 (r=+0.95).. Patients with heart failure or shock showed poor correlation between CVo2 and simultaneously determined MVo2. Furthermore, subjects with shock showed a mean CVo2 (58.0%±13.05) ...
... Oxygen is needed by cells for respiration. Oxygen used by cells in suspension must be available as dissolved oxygen. Since oxygen solubility is quite small, about 6 to 7 mg/L under normal cultivation conditions, metabolic oxygen requirement is supplied on a as needed basis by continuous aeration of culture medium. Actively respiring yeast requires about 0.15 g O2 (g cell)-1 h. At a cell concentration of 10 g L-1, medium saturated with air can support less than 30 seconds worth of metabolic oxygen. That is, a continuous supply of oxygen must be maintained in any viable aerobic manufacturing process. In this Chapter, we will first get a quantitative appreciation for metabolic oxygen demand, followed by methods used in calculating rates at which oxygen is transfered from sparged air. We will then examine methods useful in characterizing oxygen mass transfer coefficient. Finally we will evaluate bioreactor operation and design based on oxygen transfer ...
Finger Heart Rate and Blood Oxygen Saturation Monitors are designed to provide an accurate way for spot-checking heart rate, blood oxygen saturation levels, and pulse rate. Awesome for people with respiratory conditions, heart conditions and more. Perfect for exercise enthusiasts, athletes, and those who need to monit
The catalytic combustion of hydrocarbons has been studied further, with particular attention given to the ionization phenomena associated therewith. The greater ion yield of highly branched alkanes relative to straight-chain alkanes was confirmed. The effect of the concentration of O2 in the gas mixture on the extent of oxidation and ionization varied with the hydrocarbon used. In general, increase in O2 content caused considerable enhancement of the ion yield. However, with some hydrocarbons the fraction oxidized decreased markedly with increased O2 concentration. The data seem consistent with an explanation based on lower temperature oxidation occurring only on the Pt surface, whereas at higher temperatures the catalytic process extends itself to some degree into the vapor phase. It is also suggested that dissociative adsorption of O2 at higher temperatures is involved in the ion-producing process. (Author)(*HYDROCARBONS
Hi, Here is my proposal for the Oxygen service release dates and the Oxygen+1 release dates. Ive basically taken last/this years dates and adapted them accordingly. Please see below for my questions. Once the planning council approves, I will communicate these dates on the cross-project-issues-dev mailing list. Oxygen Service Releases ======================= Oxygen GA Wednesday, 06/28/2017 Oxygen.1 Checkpoint Wednesday, 07/27 (no EPP packages, no release) Oxygen JDK Update Friday, 08/04 Oxygen.1 RC1 Friday, 08/25 Oxygen.1 RC2 Friday, 09/01 Oxygen.1 RC3 Friday, 09/08 Oxygen.1 RC4 Friday, 09/15 Oxygen.1 Quiet Week Friday, 09/15 - Tuesday, 09/26 Oxygen.1 GA Wednesday, 09/27/2017 Oxygen.2 Checkpoint Wednesday, 10/19 (no EPP packages, no release) Oxygen.2 RC1 Friday, 11/17 Oxygen.2 RC2 Friday, 11/24 Oxygen.2 RC3 Friday, 12/01 Oxygen.2 RC4 Friday, 12/08 Oxygen.2 Quiet Week Friday, 12/08 - Tuesday, 12/19 Oxygen.2 GA Wednesday, 12/20/2017 Oxygen.3 Checkpoint Wednesday, 01/17 (no EPP packages, no ...
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The oxygen concentration of the atmosphere likely increased substantially in the late Neoproterozoic. Although several studies have presented compelling geochemical evidence for this stepwise oxygenation, few have addressed the mechanisms behind it. Recently it was hypothesized that the advent of eukaryotic life on land, and the associated increase in soil respiration, led to a transient reduction in the supply of oxygen for rock weathering, temporarily reducing oxidative weathering rates, allowing atmospheric oxygen levels to rise to restore the oxygen supply. To evaluate this hypothesis quantitatively, we developed a simple one-dimensional diffusion-reaction soil model that reduces the many oxygen weathering sinks to one, pyrite, given that it is the dominant sink at low oxygen concentrations. In simulations with no biological respiration, pyrite weathering rates become oxygen independent at an atmospheric oxygen concentration between 10-6× the present-day atmospheric level (PAL) and 1 PAL. ...
Pseudomonas aeruginosa PAO1 was recently found to exhibit two remarkable physiological responses to oxidative stress: (1) a strong reduction in the efficiency of oxygen transfer from the gas phase into the liquid phase, thus causing oxygen limitation in the culture and (2) formation of a clear polysaccharide capsule on the cell surface. In this work, it has been shown that the iron concentration in the culture plays a crucial role in evoking these phenomena. The physiological responses of two P. aeruginosa PAO1 isolates (NCCB 2452 and ATCC 15692) were examined in growth media with varied iron concentrations. In a computer-controlled bioreactor cultivation system for controlled dissolved oxygen tension (pO2), a strong correlation between the exhaustion of iron and the onset of oxygen limitation was observed. The oxygen transfer rate of the culture, characterized by the volumetric oxygen transfer coefficient, k L a, significantly decreased under iron-limited conditions. The formation of alginate and
Preterm infants are born with immature lungs and often require help with breathing shortly after birth. This traditionally involves administering 100% oxygen. Unfortunately, delivery of high oxygen concentrations leads to the production of free radicals that can injure many organ systems. Term and near-term newborns deprived of oxygen during or prior to birth respond as well or better to resuscitation with room air (21% oxygen) compared to 100% oxygen. However, a static concentration of 21% oxygen may be inappropriate for preterm infants with lung disease.Purpose of the study is to investigate if preterm neonates where resuscitation is initiated with 21% fiO2 and adjusted to meet transitional goal saturations (Limited oxygen strategy or LOX) would have less oxidative stress as measured by the oxidative balance ratio of biological antioxidant potential/total hydroperoxide compared to infants where resuscitation is initiated with pure oxygen and titrated for targeted saturations of 85-94% ...
inproceedings{2101216, author = {Schauvliege, Stijn and Savvas, I and Gasthuys, Frank}, booktitle = {AVA spring meeting Davos 2012}, language = {eng}, location = {Davos, Switzerland}, pages = {34--34}, publisher = {Association of Veterinary Anaesthetists (AVA)}, title = {The effect of pure oxygen or air/oxygen mixture on arterial blood oxygenation in spontaneously ventilated isoflurane anaesthetized horses: a retrospective study}, year = {2012 ...
Ten rats born and maintained in a pure oxygen environment at a total pressure of 210 mm. Hg absolute were placed individually in metabolism cages at 21 days of age and remained there for 6 weeks. They were compared with a similar group of ground-level controls. In additon, 6 rats maintained at altitude and 6 controls were sacrificed at 21 days of age to provide an initial estimate of whole-body energy. Growth rates did not differ significantly; however, overall digestibility was lowered in experimentals, 74.3% versus 79.5% for controls (P < .001), with even greater differences in protein digestibility, 65.5% versus 74.6% (P < .001). Although less fat was also digested by experimentals, 75.6% versus 81.4%, this difference was not significant. Net caloric intake for both groups was the same, however, as a result of increased food intake by experimentals. Calories given off as heat did not differ, suggesting similar metabolic rates. Carcass content of fat and protein, as a percentage of dry matter,
In a non-emergency situation, assess the patient using a pulse oximeter before administrating oxygen. Find out whether the patient has any relevant medical history, for example, chronic obstructive pulmonary disease (COPD). In COPD even moderate levels of supplementary oxygen may increase the patients carbon dioxide levels and may lead to respiratory depression and respiratory arrest.. The target oxygen saturation level is 94-98%. Give high levels of oxygen for adults with critical illnesses until their vital signs are normal then decrease the oxygen dose to maintain saturation between 94-98% Cardiac arrest - Oxygen can be attached to a Bag-Valve Mask (BVM) or pocket mask. Carbon monoxide poisoning - give high flow oxygen until emergency medical help arrives. ...
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BACKGROUND: The aim of this study was to simulate an in flight environment at sea level with a fractional inspired concentration of oxygen (FiO2) of 0.15 to determine how much supplemental oxygen was needed to restore a subjects oxygen saturation (SaO2) to 90% or to the level previously attained when breathing room air (FiO2 of 0.21). METHODS: Three groups were selected with normal, obstructive, and restrictive lung function. Using a sealed body plethysmograph an environment with an FiO2 of 0.15 was created and mass spectrometry was used to monitor the FiO2. Supplemental oxygen was administered to the patient by nasal cannulae. SaO2 was continuously monitored and recorded at an FiO2 of 0.21, 0.15, and 0.15 + supplemental oxygen. RESULTS: When given 2 l/m of supplemental oxygen all patients in the 15% environment returned to a similar SaO2 value as that obtained using the 21% oxygen environment. One patient with airways obstruction needed 3 l/m of supplemental oxygen to raise his SaO2 above 90%. ...
METHOD FOR MEASURING BLOOD OXYGEN CONTENT UNDER LOW PERFUSION - A method for measuring blood oxygen content under low perfusion, which is used in a device for measuring blood oxygen content, includes the steps of: initializing the device that is applied with power, collecting and processing data with a driving circuit of light emitting device, a bias circuit, a gain circuit and an A/D sampling circuit, which are controlled under a cone control module; calculating blood oxygen saturation based on the collected data with a data processing module which integrates the collected data in a period of time with an area integration method; and outputting from a communication functional module results of the blood oxygen saturation or pulse rate calculated with the data processing module. The method further includes a decision step of deciding the two results acquired from the data processing module with the waveform method and the integration method respectively based on the intensity of the measured ...
Headline: Bitcoin & Blockchain Searches Exceed Trump! Blockchain Stocks Are Next!. Global Blood Oxygen Sensor market report addresses the detail source of information which offers a telescopic view of the current and future market status. Various key factors are discussed in the report, which will help the buyer in studying the Global Blood Oxygen Sensor market sales trends and opportunities.. The Global Blood Oxygen Sensor market report also analyses company profiles and the growth strategies of the major Global Blood Oxygen Sensor market leaders. A detailed study of product specifications, revenue, cost, price, gross capacity, production capacity, company profiles and contact information is carried out in the analysis of Global Blood Oxygen Sensor industry key manufacturers section.. View details of this meticulous Global Blood Oxygen Sensor market research Study @ http://www.360marketupdates.com/10417759. This Research study emphasis on Types:-. ...
Squat lobster populations found in the Humboldt Current System over the continental shelf from ~28 to 37°S release pelagic larvae in sub-surface cold (~11 °C) hypoxic waters. Larvae subsequently spread throughout the water column encountering both normoxic and hypoxic conditions. We analyzed some short- and long-term responses of Pleuroncodes monodon larval metabolism to hypoxia at 11 °C. Routine and postprandial aerobic respiration rates were lower in hypoxia than in normoxia for all zoeal stages. Zoea V oxyconformed, while megalopae oxyregulated down to very low oxygen concentrations. Throughout zoea I development, the rate of nitrogen (protein) accumulation in zoea I was lower, and C:N ratios were higher under hypoxic conditions than in normoxia. Citrate synthase (CS) and malate dehydrogenase (MDH) apparent specific activities (as indicators of aerobic and metabolic potentials, respectively) decreased and remained at the same level, respectively, throughout zoea I reared under hypoxic ...
Oxygen is a gas that the cells in your body need to work properly. The air we breathe normally contains 21% oxygen. We can receive up to 100% oxygen.. WHY IS OXYGEN USED?. Babies with heart or lung problems may need to breathe increased amounts of oxygen to get normal levels of oxygen in their blood.. HOW IS OXYGEN DELIVERED?. There are several different ways to deliver oxygen to a baby. Which method is used depends on how much oxygen is needed and whether the baby needs a breathing machine.. An oxygen hood is used for babies who can breathe on their own but still need extra oxygen. A hood is a plastic dome or box with warm, moist oxygen inside. The hood is placed over the babys head.. A thin, soft, plastic tube called a nasal cannula may be used instead. This tube has soft prongs that gently fit into the babys nose. Oxygen flows through the tube. The baby must be able to breathe without assistance to use this type of oxygen therapy.. Another method is a nasal CPAP system. CPAP stands for ...
We gave a perfluorochemical oxygen-transport fluid and plasma expander, Fluosol-DA, to seven severely anemic patients before surgery to determine its effectiveness in supplementing oxygen transport. The dose of Fluosol in the five patients completing the study was 20 ml per kilogram of body weight. When the patients breathed low levels of supplemental oxygen (mean partial pressure of arterial oxygen +/- S.D., 101 +/- 25 torr), the perfluorochemical carried a small amount of oxygen, but when they received pure oxygen (arterial oxygen pressure, 361 +/- 65 torr) it carried approximately 0.8 per cent of oxygen (by volume). This increase accounted for 7 +/- 3 per cent of the patients arterial oxygen content and 24 +/- 7 per cent of their oxygen consumption. The cardiac index and left ventricular stroke-work index decreased, whereas the oxygen delivery increased, although these changes were not statistically significant. Significant changes included a 22 per cent increase in oxygen consumption, a 59 per cent
An on-line respirometer for measuring oxygen uptake by wastewater samples, plants, or animals due to respiration. A closed reaction vessel is adapted to receive and expel wastewater samples or the like. The vessel contains oxygen-sensing probes that constantly evaluate the concentration of oxygen either in the headspace of the vessel or in the samples contained in the slurry within the vessel. The oxygen that is consumed during the respiration of the test samples is immediately replaced by concurrent oxygen injection to maintain a constant oxygen concentration in the reaction vessel. This rapid oxygen replacement is accomplished through an oxygen feedback supply circuit that restores oxygen concentration to its original level in a matter of seconds. The respirometer uses a constant air flow system that allows for the precise oxygen level control. Direct measurement of the oxygen injected for equilibrium control is equated to the uptake.
the measurement of oxygen in blood within arteries and veins is mandatory for the study of oxygen supply and demand of organs. For example, the oxygen delivery (DO2) to an organ is calculated by the arterial oxygen content of the blood per volume times the blood flow to the organ. To also determine the oxygen utilization (V̇o2) by an organ, the venous oxygen content has to be known. Another example of a situation where knowledge of the venous oxygenation over time is necessary is monitoring of the "Po2-gap," i.e., the discrepancy between capillary Po2 and venous Po2 when the capillary Po2 drops below the venous Po2 (9, 22, 23). The latter occurs under certain pathophysiological conditions, such as sepsis and shock (5), and is a valuable parameter when studying resuscitation protocols and treatments.. Classically, the oxygen content of the blood is measured by taking blood samples for determination of blood gasses and the hemoglobin oxygen saturation. Although this is the most accurate way of ...
Purpose: Optimal function of the retina is dependent on adequate oxygen supply. In humans, the inner retina including the retinal ganglion cells is oxygenated via the retinal circulation. We present a method to calculate total retinal oxygen extraction based on non-invasive techniques in humans.. Methods: In a total of 8 healthy subjects, absolute retinal blood flow values and optical density ratio for each retinal vessel entering the optic nerve head were assessed using dual-beam bidirectional Doppler Optical Coherence Tomography (OCT) and spectrophotometric measurements, respectively. These experiments were done during breathing of ambient room air as well as during breathing of 100% oxygen. Based on these measurements, retinal oxygen extraction was calculated.. Results: Total retinal blood flow was 44.3 ± 3.0 ml/min during baseline and decreased to 18.7 ± 4.2 µl/min during 100% oxygen breathing (P , 0.001). Corrected arterio-venous oxygen difference was 0.053 ± 0.008 [ml(O2)/ml] at ...
The time to onset of symptoms is highly variable but most individuals can tolerate 12-16 hours of oxygen at 1.0 ATA, 8-14 hours at 1.5 ATA, and 3-6 hours at 2.0 ATA before developing mild symptoms. There are several ways to track developing pulmonary oxygen toxicity but the most sensitive and accurate is the development of symptoms. A second technique is to monitor the vital capacity. Vital capacity (the amount of air that can be moved in one large breath) decreases with increasing pulmonary toxicity. A reduction of approximately 2% in vital capacity correlates with mild symptoms while a reduction of 10% correlates symptoms so severe that most individuals will not voluntarily continue breathing oxygen. These mild effects are completely reversible and no permanent lung damage occurs. However, the damage will take 2 to 4 weeks to heal. The pathology of pulmonary oxygen toxicity is understood but beyond the scope of this discussion.. A third way to keep track, in rough terms, of pulmonary oxygen ...
To our knowledge, our study is the first to systematically correlate BOLD SI changes to endothelial-mediated blood flow changes in the human forearm. With increasing blood flow, we observed an increase in BOLD SI, with saturation at high blood flow levels. However, after intermittent ischemia, BOLD SI remained elevated even after normalization of blood flow. Because O2 consumption is constant for Po2 levels of ≥1 mm Hg and thus does not account for the observed dissociation, the decay time constant for the BOLD MRI signal may indicate the presence of microvascular oxygen reserve.. Our reactive hyperemia results are consistent with the magnitude and dynamics of BOLD SI-related changes reported previously.10,11 Very recent data by Towse et al also provided evidence for a dissociation of flow and BOLD SI.18 Persisting high values of BOLD SI after blood flow normalization are met by postischemic and even posthyperemic elevations of oxygen saturation of venous blood and tissue oxygen tension.19-21 ...
To understand the role of nitric oxide (NO) in the regulation of energy metabolism of tumor cells, its effect on the respiration and calcium homeostasis was examined with ascites hepatoma (AH130) cells under different oxygen tensions. NO reversibly inhibited the respiration and depolarized the membrane potential of AH130 cells in an oxygen-dependent manner; the inhibition was more marked at physiologically low oxygen concentrations than at its high tensions. NO reversibly decreased the cellular ATP levels and elevated the cytosolic calcium, particularly under low oxygen concentrations. Since the peritoneal cavity is fairly anaerobic, the results suggested that small amounts of NO generated in this compartment might strongly affect the energy metabolism and calcium homeostasis of tumor cells in vivo.. ...
Introduction: Oxygen delivery, or utilization, is a function of retinal blood flow and blood oxygen saturation. The retinal pigment epithelium (RPE), in particular, has been shown to have the highest levels of metabolic activity within the human body. Oxygen delivery is therefore of extreme importance to the maintenance of the health and integrity of the retina. Animal models presuppose that the oxygen tension in the retina is highest in the innermost layers at the level of the choriocapillaris, less in the photoreceptors and further decreases throughout the outer retinal structures. The choroid provides by far the largest component of the oxygen for consumption by the photoreceptors. A lack of oxygen stores in the inner retina therefore makes a constant supply crucial for its normal functioning. Blood flow dysfunction and subsequent hypoxia are both a feature in the pathogenesis of several major ocular diseases such as retinopathy of prematurity (ROP), age-related macular degeneration (ARMD), ...
This study introduces a method to detect individual oxygen molecules by fluorescence microscopy of single hemocyanins. These respiratory proteins from a tarantula bind oxygen with high affinity. A spectrometric signature of the oxygenated protein is transferred to an attached fluorescence label, which can be detected at the single-molecule level. This technique opens new perspectives for the development of small and sensitive oxygen sensors as well as for the investigation of cooperative oxygen binding in respiratory proteins.
Plants can frequently experience low oxygen concentrations due to environmental factors such as flooding or waterlogging. It has been reported that both anoxia and the transition from anoxia to re-oxygenation determine a strong imbalance in the cellular redox state involving the production of reactive oxygen species (ROS) and nitric oxide (NO). Plant cell cultures can be a suitable system to study the response to oxygen deprivation stress since a close control of physicochemical parameters is available when using bioreactors. For this purpose, Arabidopsis cell suspension cultures grown in a stirred bioreactor were subjected to a severe anoxic stress and analyzed during anoxia and re-oxygenation for alteration in ROS and NO as well as in antioxidant enzymes and metabolites. The results obtained by confocal microscopy showed the dramatic increase of ROS, H2O2 and NO during the anoxic shock. All the ascorbate-glutathione related parameters were altered during anoxia but restored during re-oxygenation.
Thiobios (sulfide-dependent) meiofauna have an aerobic metabolism, are sulfide-insensitive and rarely contain symbiotic sulfur-oxidizing bacteria. Adaptations so far observed in thiobios are consistent with the overriding need to maximize the diffusive flux of oxygen and sulfide to optimize energy yield. Both accrue from the requirement that oxygen and sulfide uptake and metabolism be controlled by diffusion and first-order rate reactions. These adaptations include variation in shape, mitochondrial distribution and respiratory capacity. Meiofauna can substantially supplement a more inefficient anaerobic metabolism with aerobic metabolism at oxygen concentrations as low as 0.1 M. Hence, an aerobic capacity is useful even in thiobios. Adaptation to low oxygen, by decreasing metabolic rate, is counterproductive unless oxygen consumption remains zero-order. Otherwise, aerobic metabolic capacity must be increased to maximize oxygen flux. Sulfide-insensitivity is necessary because a sulfide ...
Hypoxia is characteristic for a number of pathologies and promotes genetic instability, as exposure to low oxygen levels results in an elevated mutation frequency. We have previously shown that activation of the hypoxia responsive transcription factor HIF-1α, in the presence of sufficient oxygen, enhanced mutation frequencies induced by the environmental mutagen benzo[a]pyrene (BaP). Since proper carcinogen metabolism depends on oxygen we examined how varying oxygen levels influenced BaP metabolism by studying its activation and deactivation. The human lung carcinoma cell line A549 was treated with BaP under different oxygen concentrations (20%, 5%, and 0.2%) for 18 hours and alterations in BaP-metabolism were determined. First, we analyzed the BaP induced expression of key metabolic enzymes; expression levels of CYP1A1 and CYP1B1 was higher under hypoxia, while expression of the detoxifying enzymes UGT1A6 and UGT2B7 were significantly reduced by hypoxia. Then, several BaP metabolites in ...
Bradley explained that insects typically maintain 4-5 kilopascals of oxygen in their respiratory systems, 4-5 times lower than the normal oxygen concentration in the atmosphere. In a normal oxygen-concentration environment, the insect breathes for a period of time and releases a burst of carbon dioxide. It then closes its respiratory system, blocking off more intake of oxygen, to maintain the internal oxygen concentration at 4-5 kilopascals, the right oxygen concentration for its body. In a low-oxygen environment, the insect opens its respiratory system for longer periods of time; when it closes the system, it does so for only a very short time. In a stream of air with high oxygen on the other hand, the respiratory system opens briefly and then closes firmly for a long time. "In other words, insects are actively keeping oxygen out and doing it in a way that shows they know how to measure oxygen," Bradley said. "Their behavior indicates they are regulating oxygen ...
Oxygen is classified as a nonmetal. In the periodic table, it is located at the top of group 16 (formerly group 6A), which is a family of elements called the chalcogens or the oxygen family. In addition, it lies between nitrogen and fluorine in period 2.. At ordinary temperatures and pressures, free oxygen (unbound to any other element) is a colorless, odorless, tasteless gas that makes up about 21% (by volume) of air. Ordinarily, each molecule of oxygen gas consists of two oxygen atoms bound to each other, so the molecular formula is written as O2.. This molecular oxygen (O2) is essential for the human bodys metabolic processes, which sustain our lives. The human body cannot store oxygen for later use as it does with food. If the body is deprived of oxygen for more than a few minutes, unconsciousness results. The bodys tissues and organs (notably the heart and brain) are damaged if deprived of oxygen for much longer than four minutes.. Gaseous oxygen becomes a liquid at temperatures below ...
Semantic Scholar extracted view of Local cerebral blood flow and oxygen tension at different stages of surgical intervention in patients with meningiomas of the superior sagittal sinus by Semeniutin Vb et al.
We have developed an injectable foam suspension containing self-assembling, lipid-based microparticles encapsulating a core of pure oxygen gas for intravenous injection. Prototype suspensions were manufactured to contain between 50 and 90 ml of oxygen gas per deciliter of suspension. Particle size was polydisperse, with a mean particle diameter between 2 and 4 μm. When mixed with human blood ex vivo, oxygen transfer from 70 volume % microparticles was complete within 4 s. When the microparticles were infused by intravenous injection into hypoxemic rabbits, arterial saturations increased within seconds to near-normal levels; this was followed by a decrease in oxygen tensions after stopping the infusions. The particles were also infused into rabbits undergoing 15 min of complete tracheal occlusion. Oxygen microparticles significantly decreased the degree of hypoxemia in these rabbits, and the incidence of cardiac arrest and organ injury was reduced compared to controls. The ability to administer ...
Introduction: No screening procedures exist for evaluating stroke risk in adults with sickle cell anemia (SCA). Reduced oxygen carrying capacity is present in SCA, which may initially be compensated for by an increase in cerebral blood flow (CBF) and then by increased oxygen extraction fraction (OEF).. Hypothesis: OEF and CBF can be measured noninvasively and reproducibly with MRI using clinically-available equipment in adults with SCA; elevated OEF provides added discriminatory capacity for clinical impairment relative to vasculopathy extent and CBF alone.. Methods: Structural, CBF-weighted, and MRA imaging, together with a noninvasive OEF-weighted T2-relaxation-under-spin-tagging (TRUST)-MRI method was applied in SCA adults (n=26) and race and age-matched controls (n=11). A Kruskal-Wallis test was applied to evaluate mean differences between SCA and control parameters. Linear regression assessed how elevated OEF correlated with increasing clinical impairment defined by presence of infarct, ...
Acceptor-type doping of perovskite-type La1-xSrxGa0.80-yMgyM0.20O3-δ (x = 0-0.20, y = 0.15-0.20, M = Fe, Co, Ni) leads to significant enhancement of ionic conductivity and oxygen permeability due to increasing oxygen vacancy concentration. The increase in strontium and magnesium content is accompanied, however, with increasing role of surface exchange kinetics as permeation-limiting factor. At temperatures below 1223 K, the oxygen permeation fluxes through La(Sr)Ga(Mg,M)O3-δ membranes with thickness less than 1.5 mm are predominantly limited by the exchange rates at membrane surface. The oxygen transport in transition metal-containing La(Sr)Ga(Mg)O3-δ ceramics increase in the sequence Co | Fe | Ni. The ionic conduction in these phases is, however, lower than that in the parent compounds, La1-xSrxGa1-yMgyO3-δ. The highest level of oxygen permeation, comparable to that of La(Sr)Fe(Co)O3- and La2NiO4-based phases, is observed for La0.90Sr0.10Ga0.65Mg0.15Ni0.20O3-δ membranes. The average thermal
In freshwater or marine systems apparent oxygen utilization (AOU) is the difference between oxygen gas solubility (i.e. the concentration at saturation) and the measured oxygen concentration in water with the same physical and chemical properties.[1] Such differences typically occur when biological activity acts to change the ambient concentration of oxygen. For example, primary production liberates oxygen and increases its concentration, while respiration consumes it and decreases its concentration. Consequently, the AOU of a water sample represents the sum of the biological activity that the sample has experienced since it was last in equilibrium with the atmosphere. In shallow water systems (e.g. lakes), the full water column is generally in close contact with the atmosphere, and oxygen concentrations are typically close to saturation, and AOU values are near zero. In deep water systems (e.g. oceans), water can be out of contact with the atmosphere for extremely long periods of time (years, ...
Researchers have produced the strongest evidence yet that mitochondria "" the organelles that generate energy to power the cell "" also monitor oxygen concentration in the cell. If oxygen slips below a critical threshold, the mitochondrial "sensor" triggers protective responses to promote survival. Understanding how the cell senses and protects itself against hypoxia (low oxygen) has both important basic and clinical implications for biology and medicine, said one of the studys senior authors, M. Celeste Simon, a Howard Hughes Medical Institute investigator at the University of Pennsylvania. "Oxygen is absolutely essential for life, so the biological mechanisms underlying response to low oxygen are central to the cell," she said. "For example, during early development, the embryo exists in a naturally hypoxic environment until it is connected to the maternal cardiovascular system. "In the adult, changes in oxygen levels occur during inflammation and atherosclerosis; and even transient oxygen ...
My friend Joe P has created detailed instructions for building the oxygen environment he built for his guinea pig, George. George is over 5 years old and has had suffered from heavy breathing at times. The emergency vets and his vet were able to stabilize George by keeping him on oxygen and giving him Lasix. So, Joe built this tank so he could do the same for George while managing him at home ...
Oxygen concentrations vary between tissues of multicellular organisms and are changing under certain physiological or pathologic conditions. Multiple methods were developed for measuring oxygenation of biological samples in vitro and in vivo. However most of them require complex equipment, are laborious and have significant limitations. Here we report that oxygen concentration determines the choice between two maturation pathways of a DsRed FT (Timer). At high oxygen levels, this DsRed derivate matures predominantly into a red fluorescent isoform. In contrast, a green fluorescent isoform is favored by low oxygen levels. Ratiometric analysis of green and red fluorescence after a pulse of Timer expression in Drosophila larvae provides a record of the history of tissue oxygenation during a subsequent chase period, for the whole animal with single cell precision. Tissue spreads revealed fine differences in oxygen exposure among different cells of the same organ. We expect that simplicity and ...
Contrary to accepted knowledge, blood can bring more oxygen to mice brains when they exercise because the increased respiration packs more oxygen into the hemoglobin, according to an international team of researchers who believe that this holds true for all mammals.. "Standard thought was that mammalian blood is always completely saturated with oxygen," said Patrick J. Drew, Huck Distinguished Associate Professor of Neural Engineering and Neurosurgery and associate director of the Penn State Neuroscience Institute.. That would mean that the only way to get more oxygen to the brain would be to get more blood to the brain by increasing blood flow. The researchers were interested in seeing how brain oxygen levels were affected by natural behaviors, specifically exercise.. "We know that people change breathing patterns when doing cognitive tasks," said Drew. "In fact, respiration phase locks to the task at hand. In the brain, increases in neural activity usually are accompanied by increases in blood ...
The oxygen status of a tumor has significant clinical implications for treatment prognosis, with well-oxygenated subvolumes responding markedly better to radiotherapy than poorly supplied regions. Oxygen is essential for tumor growth, yet estimation of local oxygen distribution can be difficult to ascertain in situ, due to chaotic patterns of vasculature. It is possible to avoid this confounding influence by using avascular tumor models, such as Multi-Cellular Tumor Spheroids (MCTS), where oxygen supply can be described by diffusion alone and are a much better approximation of realistic tumor dynamics than monolayers. Similar to in situ tumours, spheroids exhibit an approximately sigmoidal growth curve, often approximated and fitted by logistic and Gompertzian sigmoid functions. These describe the basic rate of growth well, but do not offer an explicitly mechanistic explanation. This work examines the oxygen dynamics of spheroids and demonstrates that this growth can be derived mechanistically ...
My 85 years old grandmother is suffering from chronic obstructive pulmonary disease (COPD). |b|Earlier, she used to experience shortness of breath while walking for long but now she feels shortness of breath while resting.|/b| The doctor has prescribed 14 hours of oxygen daily and nebulisation, when required. She underwent these tests - ECHOcardiography, blood sugar, haemoglobin, routine urine. All came normal. Will she be on oxygen life long? How can low oxygen level be managed?
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Dissolved oxygen can act as a resource, because it is required for aerobic metabolism, and as information, because it can indicate poor water quality and drying pond conditions. Embryos raised in low oxygen were smaller than those raised in high oxygen indicating oxygen limits growth. The pond species, that lives in low oxygen habitats, had a much smaller response to oxygen than the stream species that generally experiences high oxygen. This suggests that the response to oxygen increases evolutionarily with the availability of oxygen. Later in development, pond larvae reversed the direction of their response so that larvae raised in low oxygen were larger than those raised in high oxygen. This growth response to low oxygen is correlated with early metamorphosis which suggests the response is adaptive when ponds dry up. The stream dweller, however, did not developmentally reverse the direction of plasticity. It continued having the largest body size in high oxygen throughout development. This ...
Adequate oxygen transport across the placenta from mother to fetus is critical for fetal growth and development. In this pilot study, BOLD MRI with maternal hyperoxygenation show great potential in differentiating IUGR fetuses from controls. Not only the placentae show significant difference in rate of oxygen uptake, fetal organs also have distinct response to exposure to hyperoxia. Differences between fetal brain and liver responses to hyperoxygenation are observed in some cases, which might suggest variations in fetal hemodynamic autoregulation ...
DENSOs oxygen sensor started to appear on vehicles with the development of fuel injection systems. The basic job of the sensor is to monitor the air fuel mixture under idle, moderate acceleration and cruise conditions. Under heavy acceleration the oxygen sensor goes into "open loop" Which basically means that the engine management computer system ignores the oxygen sensor. Oxygen sensors have a smaller range of limits in detecting and adjusting the difference from an optimum air/fuel ratio.. As the automotive industry continues to improve on their standards DENSO is keeping the pace with advancements in our engineering to meet the demands from the industry. Also as car owners are holding on to their cars for longer periods. DENSO continues to make auto parts available for those critical replacement parts.. Oxygen sensors, also known as Lambda sensors or O2 sensors among some vehicle manufacturers, are among the most sensitive and critical components on your cars engine. Earlier fuel injection ...
DENSOs oxygen sensor started to appear on vehicles with the development of fuel injection systems. The basic job of the sensor is to monitor the air fuel mixture under idle, moderate acceleration and cruise conditions. Under heavy acceleration the oxygen sensor goes into "open loop" Which basically means that the engine management computer system ignores the oxygen sensor. Oxygen sensors have a smaller range of limits in detecting and adjusting the difference from an optimum air/fuel ratio.. As the automotive industry continues to improve on their standards DENSO is keeping the pace with advancements in our engineering to meet the demands from the industry. Also as car owners are holding on to their cars for longer periods. DENSO continues to make auto parts available for those critical replacement parts.. Oxygen sensors, also known as Lambda sensors or O2 sensors among some vehicle manufacturers, are among the most sensitive and critical components on your cars engine. Earlier fuel injection ...
On Friday 28th September Eppendorf House was officially opened by Dr. Dirk Ehlers, President and CEO, Eppendorf AG, as the new headquarters for Eppendorf UK. Watch this video to see the official opening, highlights of the day and the new facilities available at the state-of-the-art Eppendorf House.
At the dentists direction you may hook up the resuscitator to an oxygen supply. Oxygen tanks are always painted green. Attach the oxygen hose from the oxygen bottle to the connector on the end of the resuscitator. On the top of the oxygen tank is the cylinder valve. A yoke is used to attach the liter gauge and pressure gauge to the oxygen tank. When directed, turn the oxygen supply cylinder valve counterclockwise (fig. 9-4) until it is completely open. Next, turn the regulator control adjust handle clockwise until the proper flow rate in liters per minute is established on the liter gauge. The normal flow rate is 6 liters per minute. Once the oxygen is turned on, place the mask over the victims nose and mouth. Pump the inflating bag once every 5 seconds for an adult, once every 4 seconds for a child, and once every 3 seconds for an infant. ...
Pure Oxygen at birth blinded me, so Id wait a bit on this one. Jenny Sutherland http://wyldcelt.homestead.com/index.html http://wyldcelt.homestead.com/myfamily.html http://wyldcelt.homestead.com/airbrushE.html ----- Original Message ----- From: "Michael" Fisher said that the results were so compelling that he urges opthalmologist everywhere to consider supplying oxygen to patients with retinal detachments while they await surgery. ----------------------- Michael email @ redacted ---------------------------------------------------------- for HELP or to subscribe/unsubscribe, contact: [email protected] send a DONATION http://www.Insulin-Pumpers.org/donate.shtml ...
Technetium-99m labeled cyclam N-2-methoxyethyl-2-(3-nitro-1-triazole) acetamide (cyclam AK 2123) has been synthesized, radiolabeled and characterized as a hypoxic tumor imaging agent. Radiochemical purity was greater than 95%. Marker biodistribution was measured in normal Wistar strain rats at different time intervals after intra venous (i.v.) administration. In vivo distribution and scintigraphic imaging studies were performed after i.v. injection into mammary tumor-bearing rats using a gamma camera and associated computer. Intratumor partial oxygen pressure (pO(2)) and oxygen saturation measurements were performed to estimate the oxygenation status of the tumors. Tumor to muscle ratio (T/M) of Tc-99m-cyclam AK 2123 was 8.5 which was compared with other tumor seeking radiopharmaceuticals, viz. Tc-99m-(V) DMSA (3.07), Tc-99m-citrate (5.29) and (201)T1C1 (3.29). T/M ratios were also evaluated in comparison with radioiodinated iodoazomycin galactopyronoside (I-125-IAZG). The ratio obtained was ...
1989) Effects of oxygen concentration on the metabolism of [u-14c]glucose by mouse morulae and early blastocysts in vitro. Reproduction, Fertility and Development, 1 (2). pp. 99-106. Wales, R.G., Cuneo, C.L. and Waugh, E.E. ...
Your body uses red blood cells to transport oxygen to all of the different muscles that have to work together during a cardio workout. A lot of oxygen is pumped to your legs and arms to keep you moving. However, at some point, your body is physically taking in less oxygen than it needs to keep you going. At times, this can force you to stop exercising. More often that not, your body goes through a process whereby it releases lactic acid into your muscles to allow them to keep going. During this time, your muscles are not receiving enough oxygen.. Once you finish working out and your muscles are no longer being used, oxygen debt requires you to continue to feed your body oxygen. Extra oxygen is required to help break down the lactic acid. This is one reason you should also stretch immediately after a workout. Stretching allows your muscles to release lactic acid and helps get oxygen back to them more quickly. It also replenishes the oxygen that you use from other systems of the body. Paying back ...
The present-day distribution of oxygen in the internal deep ocean is thus determined by a complicated and not fully understood interplay of water circulation and bio-logical productivity, which leads to oxygen consumption in the oceans interior. Extensive measurements have shown that the highest oxygen concentrations are found at high latitudes, where the ocean is cold, especially well-mixed and ventilated. The mid-latitudes, by contrast, especially on the western coasts of the continents, are characterized by marked oxygen-deficient zones. The oxygen supply here is very weak due to the sluggish water circulation, and this is further compounded by -elevated oxygen consumption due to high biological productivity. This leads to a situation where the oxygen is almost completely depleted in the depth range between 100 and 1000 metres. This situation is also observed in the northern Indian Ocean in the area of the Arabian Sea and the Bay of Bengal. Different groups of marine organisms react to the ...
Get an answer for What causes oxygen to diffuse from the lungs into the capillaries? A. Equal oxygen concentration in lungs and capillaries B. Oxygen concentration is lower in lungs C. Oxygen concentration is lower in capillaries D. Blood from pulmonary arteries is high in oxygen and find homework help for other Biology questions at eNotes
Oxygen Conservers : Oxygen conserving devices control the flow of oxygen from the oxygen source to the patient. They release oxygen only when the patient inhales, which dramatically increases the amount of time a patient can use the oxygen supply. This offers patients increased mobility and comfo...
A systematic comparison of metastatic breast cancer cells to healthy breast cells revealed dramatic differences between the two cell lines in their mechanics, migration, oxygen response, protein production, and ability to stick to surfaces.. The new study details how cells make the transition from nonmalignant to metastatic, a process that is not well understood.. "By bringing together different types of experimental expertise to systematically compare metastatic and nonmetastatic cells, we have advanced our knowledge of how metastasis occurs," says Robert Austin, professor of physics at Princeton University.. The study also found that metastatic cells recover more rapidly from the stress of a low-oxygen environment than nonmetastatic cells, which is consistent with previous studies. Although the low-oxygen environment did kill many of the metastatic cells, the survivors rebounded vigorously, underscoring the likely role of individual cells in the spread of ...
Oxygen is a chemical element.[1] Oxygens atomic mass is slightly under 16, since it also has 8 neutrons (a slight amount of mass is "lost" in the energy contained in the subatomic bonds). The name "oxygen" means "acid maker": Many common acids -- nitric, sulfuric, phosphoric, etc. -- are just hydrogen nitrate, hydrogen sulfate, or hydrogen phosphate, where the nitrate, sulfate, and phosphate complexes involve oxygen. Under normal conditions oxygen is a colorless, odorless gas consisting of two oxygen atoms which has the chemical formula O2. This means it is diatomic. Approximately 20% of the atmosphere is made up of oxygen. Oxygen also forms a triatomic molecule called ozone (O3), which, although unstable under normal conditions, is a very important ingredient in the upper atmosphere, forming a layer which blocks most of the Suns ultraviolet radiation. Oxygen is highly reactive, and in many other elements and compounds undergo exothermic reactions with it (they burn or rust). If it were not ...
One of our members emailed me referencing a video where I talked about oxyfertigation and stated the oxygen uses less energy than aeration in the rafts. I was specifically talking about liquid oxygen in comparison the 80kw-h it would take to aerate the 3600m2 raft. However, it is a great question and one we will discuss in this article. In our scenario we were talking about a 110 liter per minute air pump using 125 watts of power verses an oxygen generator producing 4 liters per minute of oxygen and consuming 250 watts of power. Straight away we see the oxygen generator is using twice the power so it is easy to think it is not as efficient as the air pump. Lets take a closer look. Air Pump First we need to determine our oxygen transfer rate (OTR) for the system we are working with. I dont have that information handy so I will set up the system as running a minimum of 5mg/L dissolved oxygen, which is great for fish and system health. We will also be running our system temperature at 25 degrees ...
Things just didnt seem to go right today. It started last night, actually, when my pulse oximeter machine (it monitors my heart rate and oxygen saturation levels) continued to show that my heart rate was too low and alarmed off constantly. It has been happening for several days so Mommy called the DME company to report the problem. After 15 minutes on the phone going through various "fixes" they finally agreed that it was a problem when the lead was not attached to anything or anyone and came up with a oxygen saturation level of 86% and a heart rate of 160! The RT said she would get with their warehouse manager and get back with Mommy and shocker - they never called back. So its going to be another night with a broken pulse ox machine. Luckily, Nicole keeps a close eye on me since she cant trust the machine right now ...
Excess Oxygen can cause pulmonary oxygen toxicity which results in a lot of damage to the body tissues. To summarize briefly, the excess oxygen can cause..
Hi Doc, i was reading on the internet about people buying canisters of pure oxygen who suffer from a number of painful conditions and they claim to get great but temporary relief of...
At low oxygen pressure, hemoglobin is in the T-state. Transition occurs from the T-state to the R-state as the oxygen pressure is increase. The T- and R-states of hemoglobin are designated as and respectively with the subscripts indicating the number of oxygen molecules bound to that state. Thus, 52 where is the equilibrium constant given by: The factor 4 in the last equation is required to take into consideration of the four identical subunits capable of binding the first oxygen molecule, while the factor 1 indicates that there is only one subunit with a bound oxygen molecule. These segments can then be grafted onto gene segments coding for human FRs. The resulting antibody is known as humanized mouse antibody. The major question in manufacturing such antibodies is which human FRs should be used. Ideally, in order to maintain the avidity of a humanized mouse antibody, the mouse FRs should be matched against all known human FRs. The most similar human FRs should then be used. This can ...
Global indices of cardiac output or systemic oxygen delivery provide little useful information regarding the adequacy of cellular oxygenation and mitochondrial function. On theoretical grounds, measuring tissue pH to assess the adequacy of perfusion is an extremely attractive concept. As a consequence of the stoichiometry of the reactions responsible for the substrate level phosphorylation of ADP to form ATP, anaerobiosis is inevitably associated with the net accumulation of protons [68]. Accordingly, knowing that tissue pH is not in the acid range should be enough information to conclude that global perfusion (and, for that matter, arterial oxygen content) are sufficient to meet the metabolic demands of the cells, even without knowledge of the actual values for tissue blood flow or oxygen delivery. By the same token, the detection of tissue acidosis should alert the clinician to the possibility that perfusion is inadequate. Prompted by this reasoning, Fiddian-Green and colleagues [65, 69, 70] ...
By using the continuous culture technique, the transition from aerobiosis to anaerobiosis and its effect on a number of enzymes has been investigated in Escherichia coli K-12. A decrease in the oxygen partial pressure below 28.0 mm of Hg resulted firstly in an increase of the respiratory enzymes (reduced nicotinamide adenine dinucleotide [NADH] oxidase, 2.53-fold; succinic dehydrogenase, 1.4-fold; cytochrome b1 3.91-fold; and cytochrome a2, 2.45-fold) before the electron transport system gradually collapsed as cytochrome a2, followed by cytochrome b1 succinic dehydrogenase, and finally NADH oxidase decreased in activity. The change from respiration to fermentation was initiated well before the oxygen tension reached zero by the increase in levels of fructose diphosphate-aldolase, glucose 6-phosphate, and 6-phosphogluconate dehydro-genases and a decrease in 2-oxoglutarate dehydrogenase. When the dissolved oxygen tension reached zero, dry weight and CO2 formation together with isocitrate ...
A 29 year old man was admitted 36 hours after ingesting about 5 g paraquat. His arterial oxygen pressure fell progressively to 3.4 kPa (34 mm Hg), and pulmonary damage induced by paraquat was diagnosed. His condition did not improve after treatment with prednisolone and cyclophosphamide, but after irradiation both lungs cleared and arterial oxygen pressure started to improve. Irradiation of the lungs should be considered in patients who, after surviving the acute phase of poisoning with paraquat, show progressive deterioration of respiratory function. ...
An electrochemical cell that receives an inlet stream of air and produces an outlet stream of a high oxygen concentration of gas. The cell is made up of a plurality of layers and preferably a porous electrolyte comprised of yttria stabilized zirconia (YSZ) that allows only oxygen ions to pass therethrough and which is covered on its sides with electrodes comprised of lanthanum strontium manganate (LSM) which in turn are coated with a layer of platinum to aid in the even distribution of the electrical current. An electrical current is passed through the electrodes to produce a voltage difference therebetween. The layers of YSZ and LSM are formed by a sol-gel process ...
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Our InvivO2 workstation is packed with new, innovative features that allow you to study even the most complex cell interactions under perfect physiological oxygen conditions. Whether youre hoping to replicate the environment of blood vessels or lung tissue, the InvivO2 is the best tool for the job.. Easy to use and adaptable to meet your needs, especially for cell culture applications that require carefully controlled oxygen regulation, InvivO2 offers accurate and stable user-defined environmental controls, direct access to the inner chamber. Among its many innovative and new standard features, InvivO2 now provides the following: ...
Metazoans rely on aerobic energy production, which requires an adequate oxygen supply. During reduced oxygen supply (hypoxia), the most profound changes in gene expression are mediated by transcription factors known as hypoxia-inducible factors (HIFs). HIF alpha proteins are commonly posttranslationally regulated by prolyl-4-hydroxylase (PHD) enzymes, which are direct "sensors" of cellular oxygen levels. We examined the molecular evolution of the metazoan PHD-HIF oxygen-sensing system by constructing complete phylogenies for PHD and HIF alpha genes and used computational tools to characterize the molecular changes underlying the functional divergence of PHD and HIF alpha duplicates. The presence of PHDs in metazoan genomes predates the emergence of HIF alphas. Our analysis revealed an unexpected diversity of PHD genes and HIF alpha sequence characteristics in invertebrates, suggesting that the simple oxygen-sensing systems of Caenorhabditis and Drosophila may not be typical of other invertebrate ...
Anyone who works with light curable resin knows about the so-called oxygen inhibition layer. This layer forms on the surface of the resin after light curing and has caused many clinicians to wonder whether their material is expired.. That is not the case; the explanation is simple. Light curable resin only fully polymerises in the absence of oxygen. Whenever ambient air (and thus oxygen) has access to the resin - this is even the case on the cured surface - there remains a thin unpolymerised layer.. This layer can be simply wiped off, but sometimes its very useful. When composite is built in layers, it ensures that each layer binds to the next. This is because each successive layer seals off the previous one from ambient air, thus allowing the previous layer to be completely polymerised. Removing the oxygen inhibition layer would prevent a solid bond from forming between the layers.. There are, however, situations where the formation of the inhibition layer is bothersome; for instance, when ...
A sensor that is capable of accurately measuring glucose and other analytes in low oxygen environments is provided. The sensor employs an enzyme-containing membrane comprising a semi-interpenetrating polymer network which is infiltrated by an enzyme. The enzyme-containing membrane increases oxygen transport to the enzyme such that oxygen is not a limiting factor in the oxidation taking place at the enzyme.
A sensor that is capable of accurately measuring glucose and other analytes in low oxygen environments is provided. The sensor employs an enzyme-containing membrane comprising a semi-interpenetrating polymer network which is infiltrated by an enzyme. The enzyme-containing membrane increases oxygen transport to the enzyme such that oxygen is not a limiting factor in the oxidation taking place at the enzyme.
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Functional brain imaging techniques such as fMRI or PET measure regional changes in cerebral blood flow and oxygenation related to neuronal activity rather than neuronal activity itself. These changes are believed to spread over a larger area than the neuronal activity thus limiting spatial resolution of imaging techniques. It has been suggested that oxygen consumption increases before blood flow in the region of increased activity. An increased oxygen consumption would lead to an initial deoxygenation limited exactly to the aera of neuronal activity thus providing a signal detectable with techniques measuring blood oxygenation (e.g. BOLD-fMRI). To test the hypothesis of an initial deoxygenation we performed measurements of intravascular oxygen concentration in the somatosensory cortex of rats in response to a physiological stimulus (whisker deflection) using oxygen dependent phosphorescence quenching. Animals were anesthetized with chloralose/urethane and a closed cranial window was implanted ...
Oxygen saturation level is a key vital sign used in clinical medicine today. Severely low levels of oxygen in the blood can lead to hypoxemia, causing cellular hypoxia, organ dysfunction, and even death. However, the instrumentation used to measure oxygen saturation does not operate with the desired reliability for such an important metric, Group 9 said.. A pulse oximeter is a noninvasive device typically used to measure a patients oxygen saturation, but this apparatus has significant limitations in certain patient populations. False or inaccurate readings are often found in patients with poor peripheral circulation, vasodilatory states, or vasoconstrictive states. In order to obtain this measurement in these patient populations, the Intensive Care Unit must conduct a very painful, invasive procedure known as an arterial puncture, and draw a significant amount of blood from an arterial catheter in order to conduct the arterial blood gas test. The device that Group 9 is designing, however, aims ...
The kidneys are responsible for filtration of blood and removal of waste products of metabolism. Next to this function, they are also involved in the regulation of the bodys red blood cell mass and blood pressure, both of which are essential for homeostasis. For the former they sense renal tissue oxygenation and release erythropoietin (EPO), triggering the production of erythrocytes. Renal oxygenation thus has to reflect overall oxygen (O2) demand. Malfunction of renal O2 regulation can affect red blood cell mass and may lead to the pathogenesis of chronic kidney disease. To date, kidney O2 regulation is poorly understood. With the help of computational methods and using the latest supercomputers, we aim to determine oxygen distribution in the kidney.. The proposed project involves the use and enhancement of mathematical models of oxygen transport in tissue. The studies will start from simplified models, which will be validated against literature, and ultimately applied to the actual vascular ...
Physical stress due to illness and infections consumes more oxygen as the body fights the invading bacteria. Stress produced from chemical toxins in the body reduces oxygen as the liver works harder to filter out toxins and waste. Emotional stress puts more strain on major organs such as the brain and heart which requires more oxygen to function. Emotional stress also produces adrenaline and adrenaline-related hormones that trigger the use of more oxygen. Lack of proper exercise prevents organs, muscles and cell tissue from absorbing more oxygen needed to revitalize. Without adequate rest, all body systems must continue to work hard, which requires more oxygen, and leads to oxygen deprivation.. ...
In the oxidation of propylene (propene, CH3-CH=CH2) to propylene oxide (propene oxide), an oxygen atom is formally inserted into the double bond. This forms a ring containing two carbon atoms and one oxygen atom. Using oxygen as the oxidizing agent had not been considered before because the oxygen molecule (O2) can only be split into individual oxygen atoms with the input of a large amount of energy. Furthermore, propylene preferentially reacts with atomic oxygen to form acrolein and not the desired propylene oxide. A suitable catalyst is eagerly sought, and has come to be viewed as the "holy grail" of catalyst research. There have been a number of catalytic developments that have been not quite satisfactory. Building upon prior work, Haruta and his team have been able to achieve a further step. Their new catalyst consists of gold clusters, which are less than 2 nm in size, deposited on a special titanium-containing silicalite support. "It is important that the gold used is not in the form of ...
Looking for Oxygen saturation? Find out information about Oxygen saturation. of a solution: see solution solution, in chemistry, homogeneous mixture of two or more substances. The dissolving medium is called the solvent, and the... Explanation of Oxygen saturation
Clinical Trials - clinicaltrials.gov The effect of PESF (Pulsating Electrostatic Field) on the oxygen saturation, quality of life and the exercise capacity will...
Pathological changes in retinal microvasculature are known to be associated with systemic diseases such as hypertension and diabetes, and may result in potentially disadvantageous blood flow and impair oxygen distribution. Therefore, in order to improve our understanding of the link between systemic diseases and the retinal circulation, it is necessary to develop an approach to quantitatively determine the hemodynamic and oxygen transport parameters in the retinal vascular circulation. This thesis aims to provide more insights into the detailed hemodynamic features of the retinal arterial tree by means of non-invasive imaging and computational modelling. It covers the following two aspects: i) 3D reconstruction of the retinal arterial tree, and ii) development of an image-based computational model to predict blood flow and oxygen transport in realistic subject-specific retinal arterial trees. The latter forms the main body of the thesis. 3D reconstruction of the retinal arterial tree was ...
Really. Can we catch a fuddruckin break? Seriously.. We had a bit of a scare yesterday night with Ryans oxygenation. After showering him and getting him in bed we rolled him onto his side to expose his butt rash to the air. Delighted in the fact that his blood pressure was normal, I completely overlooked his oxygen saturation until the monitor began alarming. It was screaming at us to pay attention. Well, I guess that teaches me NEVER to relax.. The monitor was flashing like crazy. Normally, I like being flashed, but this was not what I had in mind. Within a minute, his oxygen saturation dropped into the low to mid eighties. Not a safe level if it continues, but not quite a full-blown crisis… yet. In simple terms, oxygen saturation is the percentage of oxygen reaching tissues through the blood. One-hundred percent is ideal. When it gets below ninety-two percent there is not enough pressure to push oxygen into the red blood cells. Now the cells are beginning to starve of oxygen. Below ...
Get an answer for Two samples of a compound containing only nitrogen and oxygen are decomposed into their constituent elements. The first sample produces 2.602 g of nitrogen and 6.400 g of oxygen. The second sample produces 3.903 g of nitrogen. If these two samples are consistent with the law of constant composition, how much oxygen is produced by the second sample? and find homework help for other Science questions at eNotes
48.0 g of oxygen (O2 is diatomic) are confined in a rigid 1.00x10^3 L cubical container at temperature 300.0 K. Find the gas pressure and the force exerted by the oxygen gas on any of the six faces of the cube. Mass number of an oxygen ...
Tumor hypoxia is probably the most important not yet measurable factor that predicts the outcome of cancer therapy. Hypoxic tumors are resistant to radiation, chemotherapy, and surgery. They signal tumor cells to grow, invade, survive cytotoxic-factor assault, and increase metastatic activity. Therapies aimed at reversing hypoxia-related treatment resistance or normalizing hypoxia are proven effective with level 1 evidence. The weak link remains the lack of satisfactory methods of measurement of tumor oxygenation. ...
Both instruments feature: auto-calibration, large, graphic displays and low keypad profiles for maximum efficiency.. Microprocessor-based, the YSI 5000 and 5100 will store 100 sets of data with RS-232 interface for direct link to your computer. Both models are user upgradeable through the YSI web site, making it easy to take advantage of future software improvements.. The YSI 5100 features a built-in barometer, programmable auto-stabilization, membrane integrity function, bar code compatibility, and real-time clock. The full-featured 5100 instrument offers even greater performance and flexibility with one-button auto calibration and built-in SOUR software to meet U.S. EPA 503 regulations for safe use of biosolids. OUR (Oxygen Uptake Rate) and SOUR (Specific Oxygen Uptake Rate) are also valuable process control tools because they indicate the biological activity of microorganisms used in treatment.. If youre interested in dissolved oxygen measurements in the field, please take a look at our NEW ...
The biochemical effects of oxygen deficiency. When fuel is burned inside of the mitochondria, energy, water and carbon dioxide are produced. When there is insufficient oxygen for the combustion of fuel, lactic acid is produces, and carbon dioxide and water are not produced. This article will discuss the consequence of insufficient oxygen on the metabolism. Lactic acid. The first step in energy production in the cell is the breaking down of fuel into smaller pieces. This step requires no oxygen, and is responsible for 5% of our energy production. If there is sufficient oxygen available to the system, the next step is the oxidation of these smaller fuel pieces yielding the remaining 95% of our oxygen requirements. If however there is insufficient oxygen for this process to take place, then the body is limited to 5% of its energy potential and lactic acid is generated for the unburned fuel. Lactic acid has three main negative effects in the body. First, lactic acid causes the acidification of the ...
1. We studied the relationship between trans-cutaneous oxygen tension at the foot and local arteriovenous pressure difference in 15 normal men and women; arteriovenous pressure difference was varied by changing the height of the foot with respect to the heart and by applying external pressure to the foot.. 2. Control transcutaneous oxygen tension was 67 ± 9 sd mmHg (8.9 ± 1.2 kPa) at a control arteriovenous pressure difference of 80 ± 6 sd mmHg (10.6 ± 0.8 kPa).. 3. In every subject transcutaneous oxygen tension fell non-linearly with a decrease in arteriovenous pressure difference; transcutaneous oxygen tension was relatively insensitive to changes in arteriovenous pressure difference when arteriovenous pressure difference was high, but always fell sharply to zero at some positive arteriovenous pressure difference [range 13-34 mmHg (1.7-4.5 kPa)].. 4. An analysis of the data indicated that transcutaneous oxygen tension varied with arteriovenous pressure difference approximately as the ...
In a double-blind, randomized, placebo-controlled study of patients undergoing colonoscopy, sedation with an inhaled mixture of nitrous oxide/oxygen was compared with conventional intravenous sedation (pethidine 50 mg, midazolam 2.5 mg). In the patients studied, no significant differences were noted in number of pain episodes, need for additional intravenous sedation, or patient pain scores between the group receiving the nitrous oxide/oxygen mixture (n = 30) and those managed with conventional benzodiazepine/opiate injection (n = 29). Both methods were significantly more effective than placebo (n = 30). Six patients in the benzodiazepine/opiate group had oxygen desaturation, whereas none did in the nitrous oxide/oxygen group. Duration of stay after the procedure was significantly shorter in the gas inhalation group than in those receiving conventional intravenous sedation. Except for patients with severe chronic obstructive pulmonary disease, nitrous oxide/oxygen inhalation is a safe and acceptable
The present study reconfirms the known risk factors for postoperative delirium which are old age, altered cognitive function, and neurological or psychiatric disease [4, 20, 21]. Beyond this, the study identifies preoperative cerebral oxygen saturation (ScO2) measured with near-infrared spectroscopy as an important predictor of postoperative delirium. This finding is in line with observations of Morimoto and colleagues [17], who showed a relationship between preoperative ScO2 and the incidence of postoperative delirium in a small cohort of non-cardiac surgical patients.. Regarding the technical basis of the method, cerebral oximetry is based on the characteristic of hemoglobin to change its absorbtion spectrum with the degree of oxygenation [22]. Two wavelengths of visible and near-infrared light are used to determine the fraction of oxyhemoglobin in a small region of the frontal lobe. According to the blood distribution in cortical brain tissue, regional cerebral oxygen saturation is a ...
BackgroundSeveral beneficial effects of non-nutritive sucking in infants, including the physiological stability, relaxation, better transition from tube feeding to oral feeding have been reported. But its effect on oxygen saturation in neonates under the Nasal Continuous Positive Airway Pressure (NCPAPو (is not so clear. This study aimed to investigate the effects of non-nutritive sucking on transcutaneous oxygen saturation levels of neonates treated with NCPAP.Materials and MethodsThis quasi-experimental study was done on 25 preterm neonates, hospitalized with a diagnosis of respiratory distress, required NCPAP, in the neonatal intensive care unit (NICU) at the Ayatollah Rouhani Hospital and Babol Clinic, North of Iran. Non-nutritive sucking was elicited by a standard pacifier appropriate to their age one hour a day, and the mean oxygen saturation was measured before and after intervention by cardiopulmonary monitoring (Saadat Co., Iran). Data analyzed using SPSS-18.0 software.ResultsIn the 25 cases
Context: The use of cranial osteopathic manipulative medicine (OMM) to alter cerebral tissue oxygen saturation could play a role in the maintenance of cerebral homeostasis.. Objective: To examine the effects of cranial OMM on cerebral tissue oxygen saturation (SCTO2) and cardiac autonomic function in healthy adults.. Methods: Cranial OMM augmentation and suppression techniques and sham therapy were randomly applied to healthy adults. During cranial OMM and sham therapy, SCTO2 of the prefrontal cortex was determined bilaterally by using near-infrared spectroscopy. Heart rate, blood pressure, and systemic arterial blood oxygen saturation (SaO2) were also measured. Power spectral analysis was applied to continuous 4-minute R-R intervals. Measurements were made during 2-minute baseline periods, during 4-minute applications of the techniques, and during 5-minute recovery periods.. Results: Twenty-one adults (age range, 23-32 y) participated in the present study. Differences in mean baseline ...
Hyperbaric oxygen treatment (HBOT) is the process of breathing 100% oxygen in a carefully controlled, pressurized environment, resulting in increased oxygen delivery to the body tissue. Specially designed "chambers" safely administer the oxygen needed. Patients plasma is saturated with oxygen resulting in increased oxygen delivery to the tissues. This increased oxygen activity enhances the bodys ability to heal. Users may find this page when searching for: HOTC, HBOT, Air or Gas Embolism, Carbon Monoxide Poisoning, Decompression Sickness, Intracranial Abscess, Actinomycosis, Osteomyelitis, Dental Procedures, Radiation Tissue Effects, Gas Gangrene, Non-Healing Wounds, Sports Injuries, Crush Injury, Air Embolism, Traumatic brain injury.. ...
Hyperbaric oxygen treatment (HBOT) is the process of breathing 100% oxygen in a carefully controlled, pressurized environment, resulting in increased oxygen delivery to the body tissue. Specially designed "chambers" safely administer the oxygen needed. Patients plasma is saturated with oxygen resulting in increased oxygen delivery to the tissues. This increased oxygen activity enhances the bodys ability to heal. Users may find this page when searching for: HOTC, HBOT, Air or Gas Embolism, Carbon Monoxide Poisoning, Decompression Sickness, Intracranial Abscess, Actinomycosis, Osteomyelitis, Dental Procedures, Radiation Tissue Effects, Gas Gangrene, Non-Healing Wounds, Sports Injuries, Crush Injury, Air Embolism, Traumatic brain injury.. ...
BACKGROUND: Carbonic anhydrase inhibitors (CAIs) increase blood flow in the brain and probably also in the optic nerve and retina. Additionally they elevate the oxygen tension in the optic nerve in the pig. We propose that they also raise the oxygen tension in the retina. We studied the oxygen tension in the pig retina and optic nerve before and after dorzolamide injection. Also the retinal vessel diameters during carbonic anhydrase inhibition were studied. METHODS: A polarographic oxygen electrode was placed transvitreally immediately over the retina or the optic disc in anaesthetised pigs. The oxygen tension was recorded continually and 500 mg dorzolamide was injected intravenously. Retinal vessel diameters were analysed from monochromatic fundus photographs taken before and after injection of dorzolamide. RESULTS: Baseline retinal oxygen tension (RPO2) was 3.34+/-0.50 kPa (mean +/- SD, n=6) and baseline optic nerve oxygen tension (ONPO2) was 3.63+/-1.00 kPa. RPO2 was increased by 0.36+/-0.11 ...
TY - CONF. T1 - Retinal oxygen saturation in relation to retinal thickness in diabetic macular edema. AU - Blindbæk, Søren Leer. AU - Peto, Tunde AU - Grauslund, Jakob. PY - 2017. Y1 - 2017. N2 - Purpose: Retinal oximetry is a non-invasive measure of retinal metabolism. Diabetic retinopathy is associated with increased oxygen saturation in retinal venules. Hence, we examined if there are regional differences in retinal oxygen saturation, and if retinal oxygen saturation is correlated to retinal thickness in patients with diabetic macular edema (DME). Methods: We included 18 patients with DME that all had central retinal thickness (CRT) ,300 µm and were free of active proliferative diabetic retinopathy. Optical coherence tomography (Topcon 3D OCT-2000 spectral domain OCT) was used to evaluate retinal thickness, and oximetry was performed in 50-degree disc-centered images using the Oxymap model T1 (Oxymap, Reykjavik, Iceland). For macular measurements, we used the first traceable macular ...

Earths oxygen cycle and the evolution of animal life | PNASEarth's oxygen cycle and the evolution of animal life | PNAS

2014) Oxygen and animal evolution: Did a rise of atmospheric oxygen "trigger" the origin of animals? BioEssays 36(12):1145-1155 ... 2013) Quantifying the areal extent and dissolved oxygen concentrations of Archean oxygen oases. Chem Geol 362:35-43. ... atmosphere oxygen levels (1). Molecular oxygen (O2) is by far the most energetic of the abundant terminal oxidants used in ... Earths oxygen cycle and the evolution of animal life. Christopher T. Reinhard, Noah J. Planavsky, Stephanie L. Olson, Timothy ...
more infohttp://www.pnas.org/content/113/32/8933

Animal / Veterinary Hyperbaric OxygenAnimal / Veterinary Hyperbaric Oxygen

Hyperbaric Oxygen Therapy. Enhances Healing. In cases of acute injury and chronic disorders.. Hyperbaric Oxygen Therapy (HBOT) ... Veterinary Hyperbaric Oxygen (VHO2). VHO2 is a Lexington, Kentucky based manufacturer and global distributor of hyperbaric ... Known and identified by many names including Veterinary HBOT (Hyperbaric Oxygen Therapy), Veterinary Hyperbarics or even ... oxygen chambers for horses and companion animals. This exciting adjunctive therapy has provided veterinarians with another ...
more infohttp://www.vhbo2.com/equine/

HBOT and Multiple Sclerosis - Hyperbaric Oxygen Therapy | HBOT.COMHBOT and Multiple Sclerosis - Hyperbaric Oxygen Therapy | HBOT.COM

Hyperbaric oxygen therapy effects on MS have been published in a variety of studies, the review of which is beyond the scope of ... HBOT Epigenetic Treatment for Brain Injury - HYPERBARIC OXYGEN THERAPY. HBOT Neurology , Brain Trauma , Carbon Monoxide , ... Hyperbaric oxygen therapy effects on MS have been published in a variety of studies, the review of which is beyond the scope of ... Hyperbaric Oxygen Therapy in Autism - A Healing Victory. *HBOT in Cerebral Palsy & Pediatric Neurology: A Scientific ...
more infohttp://www.hbot.com/hbot-multiple-sclerosis

Oxygen - WikipediaOxygen - Wikipedia

Oxygen, as a mild euphoric, has a history of recreational use in oxygen bars and in sports. Oxygen bars are establishments ... Oxygen tents were once commonly used in oxygen supplementation, but have since been replaced mostly by the use of oxygen masks ... See also: Liquid oxygen and solid oxygen. Oxygen dissolves more readily in water than nitrogen, and in freshwater more readily ... Oxygen storage methods include high pressure oxygen tanks, cryogenics and chemical compounds. For reasons of economy, oxygen is ...
more infohttps://en.wikipedia.org/wiki/Oxygen

OxygenOxygen

How Much Oxygen Does the Amazon Rain Forest Provide?. "There are many many reasons to be concerned…but a risk to the worlds ... Who Is Mark Hacking? New Oxygen Series Focuses on Lies and Murder. How far would you go to keep a lie under wraps? ... Ocean Oxygen Shortage Preceded Mass Extinction. The finding fills in the gap between volcanic eruptions and marine extinctions ... Oxygen Is Disappearing From the Worlds Oceans. The ocean cant seem to catch a break-or its breath. ...
more infohttps://www.newsweek.com/topic/oxygen

oxygenoxygen

Subterranean Oxygen Park is a breath of fresh air in the Qatari desert. *Lucy Wang ... Ingenious Chlorella Oxygen Pavilion helps city dwellers breathe clean, unpolluted air using algae. *Katie Medlock ... Future Mars colonists are going to need oxygen, and NASA has a plan to make it. Their Mars 2020 Rover will be equipped... ... Stunning prefab OxyGen project will deliver a green oasis to Paris. *Lucy Wang ...
more infohttps://inhabitat.com/?s=oxygen

Oxygen tank - WikipediaOxygen tank - Wikipedia

An oxygen tank is an oxygen storage vessel, which is either held under pressure in gas cylinders, or as liquid oxygen in a ... All equipment coming into contact with high pressure oxygen must be "oxygen clean" and "oxygen compatible", to reduce the risk ... oxygen rebreather, built in breathing system (BIBS), oxygen tent, and hyperbaric oxygen chamber. ... Breathing oxygen is delivered from the storage tank to users by use of the following methods: oxygen mask, nasal cannula, full ...
more infohttps://en.wikipedia.org/wiki/Oxygen_tank

ransquared - Oxygen Toxicityransquared - Oxygen Toxicity

Oxygen Carrying Capacity. There is a marginal increase in oxygen carrying capacity (about 8mL O2 difference between RA and 100 ... Hence, hyperoxygenation improves oxygen content but decreases oxygen delivery. (Paul Marinos ICU book). ... Oxygen also produces two time-dependent effects on ventilation: an early short-lasting decrease in RR f/b longer period of ... Oxygen Delivery. Hyperoxygenation produces vasoconstriction in every tissue but lung and placenta. The systemic result is ...
more infohttps://sites.google.com/site/ransquared/respiration/oxygen-toxicity

Eclipse OxygenEclipse Oxygen

... Now Available. Were proud to announce the arrival of Eclipse Oxygen, the 12th annual simultaneous release from ... Eclipse Newsletter - Eclipse Oxygen. Find out more about the latest Eclipse Simultaneous Release in the June issue of the ... Join the Virtual Eclipse Community MeetUp (vECM). Learn from the experts and discover whats new in the Eclipse Oxygen Release ... Eclipse Oxygen Series: New in Xtext: Core Framework, LSP, Tracing Code Generator ...
more infohttp://www.eclipse.org/index.php?title=Development_Resources/HOWTO/Incubation_Phase&oldid=216716

Eclipse OxygenEclipse Oxygen

... Now Available. Were proud to announce the arrival of Eclipse Oxygen, the 12th annual simultaneous release from ... Eclipse Newsletter - Eclipse Oxygen. Find out more about the latest Eclipse Simultaneous Release in the June issue of the ... Join the Virtual Eclipse Community MeetUp (vECM). Learn from the experts and discover whats new in the Eclipse Oxygen Release ... Eclipse Oxygen Series: New in Xtext: Core Framework, LSP, Tracing Code Generator ...
more infohttp://www.eclipse.org/index.php?title=OCL&action=credits

Oxygen | SpringerLinkOxygen | SpringerLink

Physical Chemistry Electron Spectroscopy Oxygen Oxygen These keywords were added by machine and not by the authors. This ... McGuire G.E. (1979) Oxygen. In: Auger Electron Spectroscopy Reference Manual. Springer, Boston, MA. * DOI https://doi.org/ ...
more infohttps://link.springer.com/chapter/10.1007/978-1-4757-1702-0_4

Bravve - Oxygen - YouTubeBravve - Oxygen - YouTube

Music video for Oxygen performed by Bravve. Site: http://bravve.ru/ Instagram: https://www.instagram.com/bravve_music/ ... Jean Michel Jarre - Oxygen II - Duration: 7:53. Zeljko Mojsilovic 5,204,769 views ... Music video for Oxygen performed by Bravve.. Site: http://bravve.ru/. Instagram: https://www.instagram.com/bravve_music/. ...
more infohttps://www.youtube.com/watch?v=fHjCJv0-tzc

Oxygen Free CopperOxygen Free Copper

... The term oxygen free copper can be a little confusing, partly because it is inaccurate, at best it will ... Oxygen Free copper is produced in several grades:. BS C103, Cu-OF and C110, Cu-OFE are melted and cast in an oxygen free ... An oxygen level under 3 to 4 ppm is needed for reliable welding, and for this purpose reduced oxygen copper was developed. ... This level of oxygen makes welding a problem because hydrogen then combines with the oxygen to produce water vapour, which ...
more infohttp://www.angelfire.com/ab3/mjramp/ofc.html

American Oxygen - WikipediaAmerican Oxygen - Wikipedia

NL) Rihanna - American Oxygen, Ultratop. URL consultato il 17 luglio 2015.. *^ (FR) Rihanna - American Oxygen, Ultratop. URL ... American Oxygen · Work · Kiss It Better · Needed Me · Sledgehammer · Love on the Brain · Sex with Me · Pose · Desperado · Lemon ... American Oxygen è un singolo della cantante barbadiana Rihanna, pubblicato il 14 aprile 2015 dalla Roc Nation. ... Rihanna Debuts New Track American Oxygen Via Tidal (UPDATE) *^ Certificeringer, International Federation of the Phonographic ...
more infohttps://it.wikipedia.org/wiki/American_Oxygen

OxygenOxygen

Natural oxygen is a mixture of three isotopes.. Natural occurring oxygen 18 is stable and available commercially, as is water ( ... Hospitals frequently prescribe oxygen for patients with respiratory ailments. Isotopes. Oxygen has nine isotopes. ... Oxygen is the third most abundant element found in the sun, and it plays a part in the carbon-nitrogen cycle, the process once ... Oxygen was prepared by several workers, including Bayen and Borch, but they did not know how to collect it, did not study its ...
more infohttp://cse.ssl.berkeley.edu/chips_epo/oxygen.htm

oxygen Postsoxygen Posts

Lowest Blood Oxygen Levels Ever Recorded Medical researchers went to Mount Everest and took... ...at sea level has about 13-14 ... Neatorama Posts Tagged "oxygen" How Birds Get Oxygen Inside Their Eggs [https://youtu.be/w-M33PtwtM4] (YouTube link)Birds ... Two-and-a-half billion years ago, the earth was a... ...ube link)Its kind of strange to think that oxygen could have ever been ... When a bird lays an egg, it contains eve... ...ry to build a new bird -except a steady supply of oxygen . How nature works ...
more infohttps://www.neatorama.com/tag/oxygen/

OxygenOxygen

Other names: Molecular oxygen; Oxygen molecule; Pure oxygen; O2; Liquid oxygen; UN 1072; UN 1073; Dioxygen ... Kaplan, J., Active oxygen, Nature (London), 1947, 159, 673. [all data] Kvifte, 1951. Kvifte, G., Atmospheric oxygen bands in ... Degen, V.; Nicholls, R.W., The oxygen-argon afterglow as a source of the O2(A3«SIGMA»u+-X3«SIGMA»g-) Herzberg I band system, J ... New 1«SIGMA»u- ,-- 3«SIGMA»g- and 3«DELTA»u ,-- 3«SIGMA»g- absorption bands of the oxygen molecule, Can. J. Phys., 1953, 31, ...
more infohttps://webbook.nist.gov/cgi/cbook.cgi?Source=1970SNO445&Units=CAL&Mask=1000

OxygenOxygen

Other names: Molecular oxygen; Oxygen molecule; Pure oxygen; O2; Liquid oxygen; UN 1072; UN 1073; Dioxygen ... I. Mass spectrometry of oxygen-rich vanadium-tungsten-oxygen species, J. Phys. Chem., 1974, 78, 266. [all data] ... Nalley, S.J.; Compton, R.N., Collisional ionization of cesium by oxygen: The electron affinity of O2, Chem. Phys. Lett., 1971, ... Samson, J.A.R.; Gardner, J.L., On the ionization potential of molecular oxygen, Can. J. Phys., 1975, 53, 1948. [all data] ...
more infohttps://webbook.nist.gov/cgi/cbook.cgi?Source=1965ALJ%2FMAY616&Units=SI&Mask=20

ICSC 0138 -    OXYGENICSC 0138 - OXYGEN

All rights reserved. The published material is being distributed without warranty of any kind, either expressed or implied. Neither ILO nor WHO nor the European Commission shall be responsible for the interpretation and use of the information contained in this material ...
more infohttp://www.ilo.org/dyn/icsc/showcard.display?p_version=2&p_card_id=0138&p_lang=en

Unleashing oxygenUnleashing oxygen

... The MIT team used a scanning tunneling microscope (STM) to study the electrical activity of a superlattice ... Oxygen reduction is one of two main reactions in a fuel cell, and the one that has limited their overall performance - so ... One of the oxides allows superior conduction and transfer of electrons, while the other excels at holding onto oxygen atoms; to ... Fuel cells make electricity by combining hydrogen, or hydrocarbon fuels, with oxygen. But the most efficient types, called ...
more infohttp://www.physlink.com/News/PrintNews.cfm?ID=793

Oxygen Pictures - Rotten TomatoesOxygen Pictures - Rotten Tomatoes

Check out just released Oxygen Pics, Images, Clips, Trailers, Production Photos and more from Rotten Tomatoes Movie Pictures ...
more infohttps://www.rottentomatoes.com/m/oxygen/pictures/

Oxygen Thief on Apple MusicOxygen Thief on Apple Music

Listen to songs and albums by Oxygen Thief, including The Incredible Sulk, Co(Extra)Ordinates, Con. Script. Shun and many ...
more infohttps://itunes.apple.com/gb/artist/oxygen-thief/id320736166

oxygen demand | Encyclopedia.comoxygen demand | Encyclopedia.com

i.e. a measure of organic pollution). See BIOLOGICAL OXYGEN DEMAND. Source for information on oxygen demand: A Dictionary of ... oxygen demand A measure of the amount of oxidizable material present in an effluent, stream, etc. ( ... i.e. a measure of organic pollution). See BIOLOGICAL OXYGEN DEMAND.. Cite this article Pick a style below, and copy the text ... oxygen demand A Dictionary of Plant Sciences © A Dictionary of Plant Sciences 1998, originally published by Oxford University ...
more infohttps://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/oxygen-demand-0

Feasibility Studies: Oxygen ManufacturingFeasibility Studies: Oxygen Manufacturing

Techno-economic analyses of specific Oxygen production processes, presenting capital investment breakdown, raw materials ... Understand Oxygen production costs Industrial Process Economics About Oxygen Reports Coverage of Oxygen Process Economics ... Oxygen is also supplied in liquid phase, as well as all argon produced. ECONOMICS OF OXYGEN PRODUCTION VIA VSA PROCESS (O2 E13A ... ECONOMICS OF OXYGEN PRODUCTION VIA CRYOGENIC DISTILLATION (O2 E12A) Economics of Oxygen production from air in a plant also ...
more infohttps://www.slideshare.net/intratec/feasibility-studies-oxygen-manufacturing

oxygen | MagCloudoxygen | MagCloud

Make newsstand-quality magazines, flyers, posters, pamphlets, and more. Create print and digital versions using Adobe InDesign and Photoshop with our custom publishing platform.
more infohttps://www.magcloud.com/shop/tag/oxygen?p=0
  • An oxygen tank is an oxygen storage vessel, which is either held under pressure in gas cylinders , or as liquid oxygen in a cryogenic storage tank. (wikipedia.org)
  • See also ICSC0880 Oxygen refrigerated liquid (cryogenic liquid). (ilo.org)
  • For a 10-page description of our methodology, visit www.intratec.us/reports/industrial-processes-economics Reports Focused on Oxygen Production Economics ECONOMICS OF OXYGEN PRODUCTION VIA CRYOGENIC DISTILLATION (O2 E11A) Techno-economic study of Oxygen production from air in the USA using a typical cryogenic distillation process. (slideshare.net)
  • ECONOMICS OF OXYGEN PRODUCTION VIA CRYOGENIC DISTILLATION (O2 E12A) Economics of Oxygen production from air in a plant also located in the United States. (slideshare.net)
  • Herein, we quantitatively explore one aspect of the evolutionary coupling between animal life and Earth's oxygen cycle-the influence of spatial and temporal variability in surface ocean O 2 levels on the ecology of early metazoan organisms. (pnas.org)
  • Oxygen is also a crucial component of enzymatic pathways leading to the synthesis of regulatory membrane lipids ( 5 ) and structural proteins ( 6 ) in eukaryotic organisms and provides a powerful shield against solar UV radiation at Earth's surface through stratospheric ozone production. (pnas.org)
  • 2 . Diatomic oxygen gas constitutes 20.8% of the Earth's atmosphere . (wikipedia.org)
  • Oxygen is continuously replenished in Earth's atmosphere by photosynthesis , which uses the energy of sunlight to produce oxygen from water and carbon dioxide. (wikipedia.org)
  • Two-and-a-half billion years ago, the earth was a... ...ube link)It's kind of strange to think that oxygen could have ever been considered a pollutant in th. (neatorama.com)
  • Common uses of oxygen include production of steel , plastics and textiles , brazing, welding and cutting of steels and other metals , rocket propellant , oxygen therapy , and life support systems in aircraft , submarines , spaceflight and diving . (wikipedia.org)
  • Dioxygen is used in cellular respiration and many major classes of organic molecules in living organisms contain oxygen, such as proteins , nucleic acids , carbohydrates , and fats , as do the major constituent inorganic compounds of animal shells, teeth, and bone. (wikipedia.org)
  • Oxygen, which is very reactive, is a component of hundreds of thousands of organic compounds and combines with most elements. (berkeley.edu)
  • Techno-economic analyses of specific Oxygen production processes, presenting capital investment breakdown, raw materials consumed and operating costs. (slideshare.net)
  • 1. Know the capital investment required Examine the operating costs & raw materials consumption Oxygen is obtained from air separation processes and it is applied in fuels combustion to supply heat, light, and power, as well as in oxygenation applications. (slideshare.net)
  • The Intratec portfolio (www.intratec.us/our-portfolio) includes reports examining specific Oxygen production processes. (slideshare.net)
  • Metazoan life is dependent upon the utilization of O(2) for essential metabolic processes and oxygen homeostasis is an organizing principle for understanding metazoan evolution, ontology, physiology, and pathology. (nih.gov)
  • Molecular oxygen (O 2 ) is by far the most energetic of the abundant terminal oxidants used in biological metabolism (e.g., ref. 2 ). (pnas.org)
  • A detailed review of the entire spectrum of molecular oxygen has been published by Krupenie, 1972 . (nist.gov)
  • Other methods of oxygen removal include carbon reduction, which avoids adding impurities. (angelfire.com)
  • The name oxygen was coined in 1777 by Antoine Lavoisier , who first recognized oxygen as a chemical element and correctly characterized the role it plays in combustion. (wikipedia.org)
  • Commercial oxygen consumption in the U.S. is estimated at 20 million short tons per year and the demand is expected to increase substantially. (berkeley.edu)
  • Natural occurring oxygen 18 is stable and available commercially, as is water (H2O with 15% 18O). (berkeley.edu)
  • A long-standing and pervasive view is that there have been intimate mechanistic links between the evolution of complex life on Earth-in other words, the emergence and ecological expansion of eukaryotic cells and their aggregation into multicellular organisms-and the secular evolution of ocean−atmosphere oxygen levels ( 1 ). (pnas.org)
  • BS C103, Cu-OF and C110, Cu-OFE are melted and cast in an oxygen free atmosphere to give very low oxygen level, typically under 2ppm. (angelfire.com)
  • The atmosphere of Mars contains about 0.15% oxygen. (berkeley.edu)
  • Oxygen compatible" means that internal components must not burn readily or degrade easily in a high pressure oxygen environment. (wikipedia.org)
  • Oxygen is rarely held at pressures higher than 200 bars (3,000 psi), due to the risks of fire triggered by high temperatures caused by adiabatic heating when the gas changes pressure when moving from one vessel to another. (wikipedia.org)
  • All equipment coming into contact with high pressure oxygen must be "oxygen clean" and "oxygen compatible", to reduce the risk of fire . (wikipedia.org)
  • The finding was made possible by instrumentation developed in Yildiz's laboratory at MIT for observation of electron-transfer properties on surfaces: The instrument, a modified scanning tunneling microscope (STM), can observe materials at high temperatures and in an oxygen-rich environment - "representative of the operating conditions of a fuel-cell cathode," Yildiz says. (physlink.com)
  • Does 'titrating oxygen' fall under the 'high' risk management options? (aapc.com)
  • larged in some seals -- because they release more oxygen into the blood when the body is under stress, or. (neatorama.com)
  • oxygen demand A measure of the amount of oxidizable material present in an effluent, stream, etc. (i.e. a measure of organic pollution). (encyclopedia.com)
  • Researchers find first direct evidence of a "glacial oxygen pump," which they say extended an essential lifeline to the simple life forms that inhabited the Earth at the time. (newsweek.com)
  • The researchers knew how much oxygen should have diffused down into each section of. (neatorama.com)
  • Oxygen reduction is one of two main reactions in a fuel cell, and the one that has limited their overall performance - so finding improved materials for that reaction could be a key advance for fuel cells, the researchers say. (physlink.com)
  • Some of these may carry pure oxygen for accelerated decompression or as a component of a rebreather. (wikipedia.org)
  • In some countries there are legal and insurance requirements and restrictions on the use, storage and transport of pure oxygen. (wikipedia.org)
  • Gardening should be good for the environment, adding oxygen to the air, nutrients to the soil and filtering water. (inhabitat.com)
  • Most of the mass of living organisms is oxygen as a component of water , the major constituent of lifeforms. (wikipedia.org)
  • About two thirds of the human body and nine tenths of water is oxygen. (berkeley.edu)
  • Emilee Lidner, Rihanna Gifts The Earth With New Song, American Oxygen' , MTV News , 5 aprile 2015. (wikipedia.org)
  • Learn from the experts and discover what's new in the Eclipse Oxygen Release Train (June 28). (eclipse.org)
  • We're proud to announce the arrival of Eclipse Oxygen, the 12th annual simultaneous release from the Eclipse Community. (eclipse.org)
  • Download and test release candidate 3 for Eclipse Oxygen! (eclipse.org)
  • th a needlelike sensor to measure the oxygen concentration in each layer. (neatorama.com)
  • D being diffusivity (cm2/sec)--a measure of how fast the oxygen moves through the material. (wikipedia.org)
  • Note, different sources may use different units: contact package inserts often use cm2/sec, while academic papers may use other values for distance such as mm2/sec. k being the solubility (ml O2/ml of material x mm Hg)--a measure of how much oxygen is contained in the material. (wikipedia.org)
  • These values are more that twice the values of oxygen permeability for hydrogel materials. (wikipedia.org)
  • EN ) RIHANNA - AMERICAN OXYGEN (SONG) , danishcharts.com. (wikipedia.org)
  • DE ) RIHANNA - AMERICAN OXYGEN (SONG) , germancharts.com. (wikipedia.org)
  • EN ) RIHANNA - AMERICAN OXYGEN (SONG) , norwegiancharts.com. (wikipedia.org)
  • Oxygen permeability (OP) is a parameter of a contact lens that expresses the ability of the lens to let oxygen reach the eye by diffusion. (wikipedia.org)
  • "Oxygen clean" means the removal of any substance that could act as a source of ignition . (wikipedia.org)
  • There are many many reasons to be concerned…but a risk to the world's oxygen supply is not one of them," Allison Mills from Michigan Technological University told Newsweek. (newsweek.com)
  • Music Videos - American Oxygen by Rihanna , iTunes Store (US). (wikipedia.org)
  • Future Mars colonists are going to need oxygen, and NASA has a plan to make it. (inhabitat.com)
  • Natural oxygen is a mixture of three isotopes. (berkeley.edu)
  • There is a marginal increase in oxygen carrying capacity (about 8mL O2 difference between RA and 100% FiO2). (google.com)
  • Music video for Oxygen performed by Bravve. (youtube.com)
  • Evan Minsker, Rihanna Shares Politically-Charged "American Oxygen" Video , Pitchfork Media , 16 aprile 2015. (wikipedia.org)
  • Madeline Boardman, Video: Rihanna's Stunning "American Oxygen" Music Video Tells the Country's Story: Watch , su Us Weekly , 16 aprile 2015. (wikipedia.org)
  • Pictures of the dog being treated for a lack of oxygen have gone viral. (newsweek.com)