If you have been reading about Thiol and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Updated 2026-04-10. Numbers and descriptions here follow the published literature rather than marketing material.
Functionally, glutathione supports redox balance by donating electrons and becoming oxidized. It also serves as a cofactor for enzymes such as glutathione peroxidases and glutathione S-transferases. These enzymes participate in peroxide reduction and in conjugation reactions that help process reactive molecules. Separate from antioxidant roles, glutathione can modify protein cysteines through S-glutathionylation, influencing enzyme activity and signaling. Research continues to examine how these chemical roles translate into whole-organism effects.
Glutathione is a tripeptide composed of glutamate, cysteine, and glycine. Its glutamate-cysteine linkage uses the gamma-carboxyl group of glutamate, a feature that resists standard peptidases. The cysteine residue provides a thiol group, which gives the molecule its reducing character. In cells, glutathione is often the most abundant small-molecule thiol, with concentrations varying widely by tissue and compartment. It exists mainly in a reduced form called GSH, while oxidation produces a disulfide-linked dimer called GSSG.
In its reduced form, glutathione carries a sulfhydryl group that can donate electrons. This property lets it act as a major cellular antioxidant and redox buffer. Glutathione peroxidase uses it to reduce hydrogen peroxide and lipid peroxides, while glutathione reductase regenerates the reduced form using NADPH. The ratio of reduced glutathione to glutathione disulfide is widely used as an indicator of oxidative stress, though the ratio changes with compartment, cell type, and sample handling. Oxidized glutathione can also form mixed disulfides with proteins, affecting their activity.
Glutathione supports detoxification by conjugating reactive electrophiles through glutathione S-transferases. The resulting conjugates are processed and exported, often after further metabolism. It also stores cysteine, transports amino acids across membranes through the gamma-glutamyl cycle, and assists in the maturation of iron-sulfur clusters and some prostaglandins. In plants, animals, and many microbes, the molecule appears in similar roles, but concentrations vary enormously between tissues. Liver, kidney, and red blood cells tend to contain high amounts, while blood plasma contains much less.
Glutathione is a small tripeptide built from glutamate, cysteine, and glycine. The peptide bond between glutamate and cysteine uses the gamma-carboxyl group, a linkage that resists ordinary peptidases. Cells make it in two ATP-dependent steps: gamma-glutamylcysteine synthetase joins glutamate and cysteine, then glutathione synthetase adds glycine. The pathway is feedback-inhibited by glutathione itself, so intracellular levels tend to stay within a narrow range. Because cysteine is often limiting, sulfur amino acid supply influences how much glutathione a cell can produce.
| Property | Value | Notes |
|---|---|---|
| Common name | Glutathione (reduced form) | Often abbreviated GSH |
| Chemical class | Tripeptide | Contains glutamate, cysteine, and glycine |
| Molecular formula | C10H17N3O6S | Refers to the reduced form |
| Molar mass | 307.32 g/mol | Calculated for C10H17N3O6S |
| Appearance | White to off-white powder | Typical laboratory-grade solid |
On the other hand, inside a population, the presence of many different alleles ensures there will always be an individual with a specific MHC molecule able to load the correct peptide to recognize a specific microbe. The evolution of the MHC polymorphism ensures that a population will not succumb to a new pathogen or a mutated one, because at least some individuals will be able to develop an adequate immune response to win over the pathogen. The variations in the MHC molecules (responsible for the polymorphism) are the result of the inheritance of different MHC molecules, and they are not induced by recombination, as it is the case for the antigen receptors. Because of the high levels of allelic diversity found within its genes, MHC has also attracted the attention of many evolutionary biologists, as well as disease specialists.
=== Morphology === The morphologic variations in the size, shape, volume, tissue density, pectoral locale, and spacing of the breasts determine their natural shape, appearance, and position on a woman's chest. Breast size and other characteristics do not predict the fat-to-milk-gland ratio or the potential for the woman to nurse an infant. The size and the shape of the breasts are influenced by normal-life hormonal changes (thelarche, menstruation, pregnancy, menopause) and medical conditions (e.g. breast hypertrophy). The shape of the breasts is naturally determined by the support of the suspensory Cooper's ligaments, the underlying muscle and bone structures of the chest, and by the skin envelope. The suspensory ligaments sustain the breast from the clavicle (collarbone) and the clavico-pectoral fascia (collarbone and chest) by traversing and encompassing the fat and milk-gland tissues. The breast is positioned, affixed to, and supported upon the chest wall, while its shape is established and maintained by the skin envelope. In most women, one breast is slightly larger than the other. More obvious and persistent asymmetry in breast size occurs in up to 25% of women. The base of each breast is attached to the chest by the deep fascia over the pectoralis major muscles. The base of the breast is semi-circular, however the shape and position of the breast above the surface is variable. The space between the breast and the pectoralis major muscle, called retromammary space, gives mobility to the breast.
==== Elimination ==== MDMA and metabolites are primarily excreted as conjugates, such as sulfates and glucuronides. MDMA is a chiral compound and has been almost exclusively administered as a racemate. However, the two enantiomers have been shown to exhibit different kinetics. The disposition of MDMA may also be stereoselective, with the S-enantiomer having a shorter elimination half-life and greater excretion than the R-enantiomer. Evidence suggests that the area under the blood plasma concentration versus time curve (AUC) was two to four times higher for the (R)-enantiomer than the (S)-enantiomer after a 40 mg oral dose in human volunteers. Likewise, the plasma half-life of (R)-MDMA was significantly longer than that of the (S)-enantiomer (5.8 ± 2.2 hours vs 3.6 ± 0.9 hours). However, because MDMA excretion and metabolism have nonlinear kinetics, the half-lives would be higher at more typical doses (100 mg is sometimes considered a typical dose).
Paul, Gregory S. (2002). Dinosaurs of the Air: The Evolution and Loss of Flight in Dinosaurs and Birds. Baltimore; London: Johns Hopkins University Press. ISBN 978-0-8018-6763-7. LCCN 2001000242. OCLC 1088130487.. Sternberg, Charles Mortram (1966) [Original edition published by E. Cloutier, printer to the King, 1946]. Canadian Dinosaurs. Geological Series. Vol. 54 (2nd ed.). Ottawa: National Museum of Canada. LCCN gs46000214. OCLC 1032865683. Stewart, Tabori & Chang (1997). The Humongous Book of Dinosaurs. New York: Stewart, Tabori & Chang. ISBN 978-1-55670-596-0. LCCN 97000398. OCLC 1037269801. University of Southampton (September 29, 2021). "Two New Species of Large Predatory Dinosaur with Crocodile-Like Skulls Discovered on Isle of Wight". SciTechDaily. Zhou, Zhonghe (October 2004). "The origin and early evolution of birds: discoveries, disputes, and perspectives from fossil evidence" (PDF). Naturwissenschaften. 91 (10). Berlin: Springer Science+Business Media: 455–471. Bibcode:2004NW.....91..455Z. doi:10.1007/s00114-004-0570-4. ISSN 0028-1042. PMID 15365634. S2CID 3329625. Archived from the original (PDF) on July 21, 2011. Retrieved November 6, 2019.
Sources: en.wikipedia.org
Microwave burns are burn injuries caused by thermal effects of microwave radiation absorbed in a living organism. In comparison with radiation burns caused by ionizing radiation, where the dominant mechanism of tissue damage is internal cell damage caused by free radicals, the type of burn caused by microwave radiation is by heat—health effects colloquially associated with the term "radiation", such as radiation poisoning, cannot be caused by exposure to microwaves or other forms of non-ionizing radiation. Microwave damage can manifest with a delay; pain or signs of skin damage can show some time after microwave exposure.
=== Iodine, bromine and kappa number === In measuring unsaturation in fatty acids, the traditional method is the iodine number. Iodine adds stoichiometrically to double bonds, so their amount is reported in grams of iodine spent per 100 grams of oil. The standard unit is a dimensionless stoichiometry ratio of moles double bonds to moles fatty acid. A similar quantity, bromine number, is used in gasoline analysis. In pulp and paper industry, a similar kappa number is used to measure how much bleaching a pulp requires. Potassium permanganate is added to react with the unsaturated compounds (lignin and uronic acids) in the pulp and back-titrated. Originally with chlorine bleaching the required quantity of chlorine could be then calculated, although modern methods use multiple stages. Since the oxidizable compounds are not exclusively lignin and the partially pulped lignin does not have a single stoichiometry, the relation between the kappa number and the precise amount of lignin is inexact.
=== Wet symptoms === Circulatory shock Diarrhea (feces which resemble more liquid than solid) Hemorrhage (bleeding) and sometimes bleeding diathesis (a person loses more blood than usual from an injury – for example, getting only a little cut, and losing a lot of blood) Petechiae (small red or purple spots) Swelling caused by edema The severity of symptoms varies with both individual immune competence and the type of virus. The "VHF syndrome" causes bleeding diathesis, capillary leak, and circulatory shock. It happens to most people who have Filoviridae infections (such as Ebola virus or Marburg virus), Crimean–Congo hemorrhagic fever (CCHF), or the South American hemorrhagic fevers (which are caused by Arenaviridae). VHF syndrome only happens to a small minority of people who have dengue fever or Rift Valley fever.
February 4: Abolition of slavery in French colonies (not applied in some later-acquired colonies; slavery reestablished in most colonies from 1802, except Saint-Domingue, independent in 1804). March 12: Possibility to annul religious vows made before age 18 for girls or 21 for boys. 1795
Meat from sheep features prominently in the cuisines of several Mediterranean cultures including Greece, Croatia, Turkey, North Africa, Jordan, and the Middle East, as well as in the cuisines of Iran and Afghanistan. In Greece, for example, it is an integral component of many meals and of religious feasts such as Easter, like avgolemono and magiritsa. It is also popular in the Basque culture, both in the Basque country of Europe and in shepherding parts of the Western United States, where shepherds of Basque descent have been active since the 1850s. In the United States, the Navajo have incorporated mutton and lamb into their traditional cuisine since the introduction of sheep by Spanish explorers and settlers in the 17th century, replacing wild turkey and venison and creating a pastoral culture. In Northern Europe, mutton and lamb feature in many traditional dishes, including those of Iceland, Norway and the United Kingdom. Mutton is popular in Australia. Lamb and mutton are very popular in Central Asia and in certain parts of China, where other red meats may be eschewed for religious or economic reasons. Barbecued mutton is also a specialty in some areas of the United States, chiefly Owensboro, Kentucky, and Canada. Meat from sheep is generally consumed far less in the US than in many European, Central American and Asian cuisines. Average per-capita consumption of lamb in the United States is only 400 grams (14 oz) per year. In Australia, the leg of lamb roast is considered to be the national dish.
Sources: en.wikipedia.org
The minus sign comes from the convention that the force is considered towards the surface element, while the normal vector points outward. The equation has meaning in that, for any surface S in contact with the fluid, the total force exerted by the fluid on that surface is the surface integral over S of the right-hand side of the above equation. It is incorrect (although rather usual) to say "the pressure is directed in such or such direction". The pressure, as a scalar, has no direction. The force given by the previous relationship to the quantity has a direction, but the pressure does not. If we change the orientation of the surface element, the direction of the normal force changes accordingly, but the pressure remains the same. Pressure is distributed to solid boundaries or across arbitrary sections of fluid normal to these boundaries or sections at every point. It is a fundamental parameter in thermodynamics, and it is conjugate to volume. It is defined as a derivative of the internal energy of a system:
Vayda (1952), professor emeritus of anthropology and ecology at Rutgers University Melvin Ember (1953), professor of the City University of New York and editor of Cross-Cultural Research Julian Wolpert (1953), professor of urban planning at the Princeton School of Public and International Affairs Demetrios James Caraley (1954), editor of Political Science Quarterly and president of the Academy of Political Science Peter Kenen (1954), provost, Columbia University and expert in Optimum currency area theory Henry Littlefield (1954), educator, author, historian who initiated political interpretations of The Wonderful Wizard of Oz Stephen Orgel (1954), Shakespeare and Renaissance literature scholar David Rosand (1954), art historian, Columbia University Haldon Chase (1955), Denver-based archeologist, early figure of the Beat Generation Warren I. Cohen (1955), historian at University of Maryland, Baltimore County Harry N. Scheiber (1955), professor and director of the Institute for Legal Research at the UC Berkeley School of Law Jerry Fodor (1956), philosopher at Rutgers University Roy Lubove (1956), professor of social welfare at the University of Pittsburgh Seymour J.
== Further reading == Bachner, Paul (2021). In further pursuit of excellence: the college of American pathologists 1946-2020 (PDF) (1st ed.). Northfield: College of American Pathologists. ISBN 978-1-941096-61-1.
=== United States === In the United States it is legal to purchase poppy seeds, but all other parts of the plant are considered Schedule II controlled substances under the federal Controlled Substances Act of 1970. Unwashed poppy seeds can potentially contain lethal concentrations of morphine but only in excessively large quantities (e.g. multiple pounds of seeds). The Opium Poppy Exclusion Act of 1942 bans growing the poppy in many cases but is generally not a problem for gardeners as the plant is widely grown for the flowers, and for seeds for replanting and cooking. For much of US history poppies were a significant cash crop, and the government encouraged farmers to grow more poppies for medicinal use during wars up to World War I. It is, however, manufacture of a schedule II substance to create a drink for the opium content, and the possession of it is illegal as well.
Sources: en.wikipedia.org
Glutathione is a sulfur-containing tripeptide made from glutamate, cysteine, and glycine. It is found in most cells and participates in redox balance and detoxification reactions.
No. It is a tripeptide assembled from three amino acids. The term amino acid applies to the individual building blocks, not to the assembled molecule.
It is present in many tissues, with especially high amounts in liver. Intracellular concentrations are generally much higher than those found in blood plasma.
It is a tripeptide of glutamate, cysteine, and glycine. The glutamate-cysteine bond is unusual because it forms through the gamma-carboxyl group.