For our research projects, we employ biochemical, biophysical, spectroscopic and structural biology approaches with *Populus trichocarpa* and *Arabidopsis thaliana* as model organisms to explore (i) the roles of the antioxidant/detoxification systems in the physiology of plants subject to environmental constraints and (ii) the maturation and roles of iron-sulfur proteins in plant organelles. (hal.science)
Compounds11
Many sulfur compounds are odoriferous, and the smells of odorized natural gas, skunk scent, bad breath, grapefruit, and garlic are due to organosulfur compounds. (wikipedia.org)
Sulfur is an essential element for all life, but almost always in the form of organosulfur compounds or metal sulfides. (wikipedia.org)
Amino acids (two proteinogenic: cysteine and methionine, and many other non-coded: cystine, taurine, etc.) and two vitamins (biotin and thiamine) are organosulfur compounds crucial for life. (wikipedia.org)
Volatile sulfur compounds can be formed at various stages during wine production and storage, and some may impart unpleasant "reduced" aromas to wine when present at sensorially significant concentrations. (datapdf.com)
Quantitative data are necessary to understand factors that influence the formation of volatile sulfur compounds, but their analysis is not a trivial undertaking. (datapdf.com)
A rapid and selective method for determining 10 volatile sulfur-containing aroma compounds in wine that have been linked to "offodors" has been developed. (datapdf.com)
To study the contribution of volatile sulfur compounds, the GC-SCD method was applied to 68 commercial wines that had reductive sensory evaluations. (datapdf.com)
Over 700 volatile compounds are known to contribute to wine aroma and flavor (1-5), including compounds containing one or more sulfur atoms. (datapdf.com)
Volatile sulfur compounds can be formed by biological and chemical mechanisms at various stages during wine production and storage and often have low aroma detection thresholds (from ng/L to μg/L range). (datapdf.com)
The research on the auxiliary role of reducing factors revealed that reducing sulfur compounds could be applied in keratinolysis enhancement during enzymatic digestion of keratin, rather than in culture conditions. (scielo.br)
Cofactors1
It is also a key element for all life as the major component of amino acids, vitamins and many other cofactors. (blansacar.cn)
Hydrogen4
Hydrogen sulfide gives the characteristic odor to rotting eggs and other biological processes. (wikipedia.org)
Under normal conditions, sulfur hydrolyzes very slowly to mainly form hydrogen sulfide and sulfuric acid: 1⁄2 S 8 + 4 H 2O → 3 H 2S + H 2SO 4 The reaction involves adsorption of protons onto S 8 clusters, followed by disproportionation into the reaction products. (wikipedia.org)
The analytes implicated as contributors to reductive characters were hydrogen sulfide, methanethiol, and dimethyl sulfide, whereas carbon disulfide played an uncertain role. (datapdf.com)
In this context, the intervention of the TRX and glutathione (GSH)/GRX reducing systems in the sulfur signaling/trafficking pathways is examined as both the TRX and GSH/GRX systems might modulate STR function and in particular be central to the formation of hydrogen sulfide, a molecule susceptible to trigger redox signalling cascades in several physiological situations. (hal.science)
Sulfate4
Though sometimes found in pure, native form, sulfur on Earth usually occurs as sulfide and sulfate minerals. (wikipedia.org)
The greatest commercial use of the element is the production of sulfuric acid for sulfate and phosphate fertilizers, and other chemical processes. (wikipedia.org)
It exists in various kinds of forms and compound such as sulfide and sulfate minerals which can be found everywhere around the universe and earth. (blansacar.cn)
For example, one of its biggest applications is for the production of sulfuric acid for sulfate and phosphate fertilizers. (blansacar.cn)
Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formula S8. (wikipedia.org)
Dioxide2
While reaction between sulfur and oxygen at normal conditions gives sulfur dioxide (oxidation state +4), formation of sulfur trioxide (oxidation state +6) requires temperature 400 - 600 °C and presence of a catalyst. (wikipedia.org)
Sulfur, in its elemental form, is rather common and does not have a taste or odor except whenin contact with oxygen, when it forms small amounts of sulfur dioxide. (blansacar.cn)
Sulfur belongs to a nonmetallic chemical element (pure product: yellow crystalline solid) under the symbol S. It can actively react with many other elements. (blansacar.cn)
Sulfur is a yellow crystalline solid or powder. (blansacar.cn)
Living organisms1
Sulfur is one of the core chemical elements needed for biochemical functioning and is an elemental macronutrient for all living organisms. (wikipedia.org)
Nonmetallic2
Sulfur, S, is a nonmetallic element that exists in a crystalline or amorphous form and in four stable isotopes. (blansacar.cn)
Sulfur is considered a nonmetallic solid. (blansacar.cn)
Elemental2
Today, almost all elemental sulfur is produced as a byproduct of removing sulfur-containing contaminants from natural gas and petroleum. (wikipedia.org)
HPLC analysis of "elemental sulfur" reveals an equilibrium mixture of mainly S8, but with S7 and small amounts of S6. (wikipedia.org)
Brimstone1
1. Orthorhombic (or rhombic) octahedral lemon-yellow crystals, which are also called"brimstone" and referred to as "alpha" sulfur. (blansacar.cn)
Allotrope2
Between its melting and boiling temperatures, octasulfur changes its allotrope again, turning from β-octasulfur to γ-sulfur, again accompanied by a lower density but increased viscosity due to the formation of polymers. (wikipedia.org)
Amino and amide groups from these 2 substances are freely transferred to other carbon skeletons by transamination and transamidation reactions. (medmuv.com)
Sulfur melts at temperatures rangingfrom 112.8°C (234 °F) for the rhombic form to 120.0°C(248 °F) for amorphous sulfur,and all forms boil at 444.7°C (835°F). Sulfur occurs as free sulfur in many volcanic areas and is often associated with gypsum and limestone. (blansacar.cn)
Molecules2
Sulfur forms several polyatomic molecules. (wikipedia.org)
Those having a cysteinyl residue in their catalytic site (Cys-GSTs) possess the ability to catalyze the reverse reaction, *i.e.*, the removal of glutathione from a number of structurally different heterocyclic molecules. (hal.science)
Density1
The density of this form of sulfur is 2.06g/cm 3 , with a melting point of 95.5°C. (blansacar.cn)
Disulfide2
Sulfur is insoluble in water but soluble in carbon disulfide and, to a lesser extent, in other nonpolar organic solvents, such as benzene and toluene. (wikipedia.org)
Sulfur reacts with nearly all other elements with the exception of the noble gases, even with the notoriously unreactive metal iridium (yielding iridium disulfide). (wikipedia.org)
Petroleum1
Sulfur is an element found in many common minerals, such as galena (PbS), pyrite(fool's gold, FeS 2 ), sphalerite (ZnS), cinnabar (HgS), and celestite (SrSO 4 ), among others.About 1/4 of all sulfur procured today is recovered from petroleum production. (blansacar.cn)
Reactions2
In reactions with elements of lesser electronegativity, it reacts as an oxidant and forms sulfides, where it has oxidation state -2. (wikipedia.org)
Some product of these reactions are utilized for other purposes (thus salvaging a portion of the amino nitrogen), while others are excreted. (medmuv.com)
Form3
Being abundant in native form, sulfur was known in ancient times, being mentioned for its uses in ancient India, ancient Greece, China, and ancient Egypt. (wikipedia.org)
Amorphous sulfur issoft and elastic, and as it cools, it reverts back to the orthorhombic allotropic form. (blansacar.cn)
Nitrogen fixation is carried out by bacterial nitrogenases forming reduced nitrogen, NH4+ which can then be used by all organisms to form amino acids. (medmuv.com)
Analysis2
Johnson (Athens, USA), O. Keech (Umea), A. Meyer (Bonn), U. Mühlenhoff (Marburg), C. Remacle (Liège), F. Vignols (BPMP Montpellier)** - **Structure-Function analysis of glutathione transferases** Glutathione transferases (GSTs) constitute large multigenic families of more than 50 genes in terrestrial plants. (hal.science)
The current work is centered on the structure-function analysis of specific classes of glutathione transferases, focusing in particular on the isolation and identification of physiological substrates explaining their implication in biotic or abiotic stress responses. (hal.science)
Ancient times1
Sulfur has been known since ancient times primarily because it is a rather common substance.It is the 15th most common element in the universe, and though it is not found in allregions of the Earth, there are significant deposits in south Texas and Louisiana, as well in allvolcanoes. (blansacar.cn)
Chemical1
Sulfur (also spelled sulphur in British English) is a chemical element with the symbol S and atomic number 16. (wikipedia.org)
Applications2
Sulfur has applications in various kinds of fields. (blansacar.cn)
The objective of this study was to evaluate the salicylic acid applications in attenuating the harmful effects of saline nutrient solution on the physiology and growth of 'Gaúcho' melon cultivated in the NFT hydroponic system. (bvsalud.org)
Forms1
Sulfur forms over 30 solid allotropes, more than any other element. (wikipedia.org)
Found1
A pair of principal enzymes, glutamate dehydrogenase and glutamine synthatase, are found in all organisms and effect the conversion of ammonia into the amino acids glutamate and glutamine, respectively. (medmuv.com)