glutathione comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Last reviewed on 2025-09-30. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
Commercial glutathione is produced by microbial fermentation or chemical synthesis, then purified. Reduced and oxidized grades are offered separately, with purity specifications often exceeding 98 percent. The compound appears in foods such as fresh fruits, vegetables, and meats, although cooking and processing can lower amounts. Oral, topical, and inhaled forms are discussed in research and consumer contexts, but absorption and tissue delivery remain active areas of study. Regulatory status varies by country and intended use.
Glutathione is a small sulfur-containing peptide built from glutamic acid, cysteine, and glycine. Its distinctive feature is a gamma-glutamyl bond between glutamate's side-chain carboxyl group and cysteine's amino group. This linkage resists ordinary peptidases and helps the molecule remain stable inside cells. The reduced thiol form, often abbreviated GSH, is the dominant intracellular species. The oxidized disulfide dimer, GSSG, forms when two reduced molecules link through their cysteine sulfur atoms. The balance between these forms is a common redox indicator.
| 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 |
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.
Storage conditions strongly influence glutathione stability. The solid reduced form is commonly kept desiccated at or below minus twenty degrees Celsius, protected from light and moisture. Aqueous solutions are less stable because the thiol group reacts with dissolved oxygen, and oxidation accelerates at neutral or alkaline pH. Acidic solutions and oxygen-free handling can slow degradation, but repeated freeze-thaw cycles should be avoided. Researchers often verify concentration before use, because apparent losses can arise from oxidation or water uptake.
Measuring glutathione in biological samples requires attention to oxidation and matrix effects. High-performance liquid chromatography with ultraviolet or fluorescence detection can separate reduced and oxidized forms after derivatization. Liquid chromatography with tandem mass spectrometry offers higher specificity and can quantify glutathione alongside related thiols. Because glutathione can oxidize during sample handling, many protocols use rapid acidification with metaphosphoric acid or sulfosalicylic acid. Internal standards help correct for losses during extraction and analysis.
=== Direct DNA template hypothesis === Soviet-American physicist George Gamow was the first to come up with a coherent scheme for protein synthesis from DNA. Based on the Watson-Crick model, he envisaged that the DNA itself is a direct template for protein synthesis. Assuming that the four bases of DNA could produce 20 different combinations as triplets, he suggested that the different amino acids must correspond to a twenty-letter alphabet of the nucleotide sequence. In such configuration, the DNA directly produces proteins from the free molecules of amino acids. In the 13 February 1954 issue of Nature he explained:It seems to me that such translation procedure can be easily established by considering the 'key-and-lock' relation between various amino-acids, and the rhomb-shaped 'holes' formed by various nucleotides in the deoxyribonucleic acid chain... One can speculate that free amino-acids from the surrounding medium get caught into the 'holes' of deoxyribonucleic acid molecules, and thus unite into the corresponding peptide chains.Watson, then at the California Institute of Technology in Massachusetts, also thought up the issue. Unlike Gamow, he realised the possible importance of RNA as an intermediate stage in protein synthesis. He initially imagined that DNA was first converted by chemical reaction to RNA, but then changed his view to DNA as a template for RNA synthesis. This latter model, which he called "not ugly" was starting to become more convincing.
p is the pressure ρ is the density and ρ(p) indicates that it is a function of pressure v is the flow speed Ψ is the potential associated with the conservative force field, often the gravitational potential In engineering situations, elevations are generally small compared to the size of the Earth, and the time scales of fluid flow are small enough to consider the equation of state as adiabatic. In this case, the above equation for an ideal gas becomes:
All lepidosaurs and turtles have a three-chambered heart consisting of two atria, one variably partitioned ventricle, and two aortas that lead to the systemic circulation. The degree of mixing of oxygenated and deoxygenated blood in the three-chambered heart varies depending on the species and physiological state. Under different conditions, deoxygenated blood can be shunted back to the body or oxygenated blood can be shunted back to the lungs. This variation in blood flow has been hypothesized to allow more effective thermoregulation and longer diving times for aquatic species, but has not been shown to be a fitness advantage.
An independent body (a review board or a committee, institutional, regional, national, or supranational), constituted of medical/scientific professionals and nonmedical/nonscientific members, whose responsibility it is to ensure the protection of the rights, safety, and well-being of human subjects involved in a trial and to provide public assurance of that protection, by, among other things, reviewing and approving/providing favorable opinion on the trial protocol, the suitability of the investigator(s), facilities, and the methods and material to be used in obtaining and documenting informed consent of the trial subjects. The legal status, composition, function, operations, and regulatory requirements pertaining to Independent Ethics Committees may differ among countries, but should allow the Independent Ethics Committee to act in agreement with GCP as described in this guidance. (ICH E6) Indication
Soy was most likely domesticated 6,000–9,000 years ago in the region between the Yellow River and the Huai River in China. The earliest documented evidence for the use of Glycine of any kind comes from charred plant remains of wild soybean recovered from Jiahu in Henan province, a Neolithic site occupied between 9,000 and 7,800 years ago. An abundance of archaeological charred soybean specimens have been found accumulated around this region. Soybeans became an important crop by the Zhou dynasty (c. 1046–256 BC) in China. According to an ancient Chinese myth, in 2853 BC, the legendary Emperor Shennong of China proclaimed that five plants were sacred: soybeans, rice, wheat, barley, and millet. Early Chinese records mention that soybeans were a gift from the region of the Yangtze River delta and Southeast China. However, there is no archaeological evidence that soybeans were domesticated in southern China, and it appears that soy was unknown there prior to the Han dynasty. The oldest preserved soybeans resembling modern varieties in size and shape were found in archaeological sites in Korea dated about 1000 BC. Radiocarbon dating of soybean samples recovered through flotation during excavations at the Early Mumun period Okbang site in Korea indicated soybeans were cultivated as a food crop in around 1000–900 BC. Soybeans from the Jōmon period in Japan from 3000 BC are also significantly larger than wild varieties. The earliest Japanese textual reference to the soybean is in the classic Kojiki (Records of Ancient Matters), which was completed in 712 CE.
Sources: en.wikipedia.org
== Public image == Kennedy is known for his pronounced Southern drawl and folksy manner of speaking. He is also known for making quips during speeches and senate hearings. However, some colleagues who knew Kennedy during his Louisiana politics days say that his speaking style is just a persona. Columnist Ed Felien wrote that Kennedy "has all the charm of a Southern gentleman and the venom of a rattlesnake." Politico named Kennedy one of the "biggest social media stars in Congress", alongside Representative Alexandria Ocasio-Cortez, Senator Bernie Sanders, Senator Rand Paul and Representative Brandon Gill.
== References == Brendon, Piers (2010). The Decline and Fall of the British Empire, 1781–1997 (1st Vintage books ed.). New York City: Vintage Books. ISBN 9780307388414. Cilliers, Jakkie (1985). Counter-Insurgency in Rhodesia (PDF). Beckenham, United Kingdom: Croom Helm. ISBN 0-7099-3412-2. Cline, Lawrence E. (2005). "Pseudo Operations and Counterinsurgency: Lessons from Other Countries" (PDF). Strategic Studies Institute, US Army War College. Cross, G. (2017). Dirty War: Rhodesia and Chemical Biological Warfare, 1975–1980. Helion & Company. ISBN 978-1-911512-12-7. Dzimbanhete, Jephias Andrew (March 2017). "Reverberations of Rhodesian Propaganda in Narratives of Zimbabwe's Liberation War". Journal of Pan African Studies. 10 (1): 295–307. Evans, Michael (June 2007). "The Wretched of the Empire: Politics, Ideology and Counterinsurgency in Rhodesia, 1965–80". Small Wars & Insurgencies. 18 (2): 175–195. doi:10.1080/09574040701400601. S2CID 144153887. Gatchel, Theodore L. (2008). "Pseudo Operations – A Double Edged Sword of Counterinsurgency". In Norwitz, Jeffery H. (ed.). Armed Groups: Studies in National Security, Counterterrorism, and Counterinsurgency. Newport, Rhode Island: US Naval War College. pp. 61–74. ISBN 9781884733529. Martinez, Ian (December 2002). "The History of the Use of Bacteriological and Chemical Agents during Zimbabwe's Liberation War of 1965–80 by Rhodesian Forces". Third World Quarterly. 23 (6): 1159–1179. doi:10.1080/0143659022000036595. ISSN 0143-6597. JSTOR 3993569. S2CID 145729695. McLaughlin, Peter (August 1991).
=== Replication cycle === Virus infections start when viral particles bind to host surface cellular receptors. Protein modelling experiments on the spike protein of the virus soon suggested that SARS‑CoV‑2 has sufficient affinity to the receptor angiotensin converting enzyme 2 (ACE2) on human cells to use them as a mechanism of cell entry. By 22 January 2020, a group in China working with the full virus genome and a group in the United States using reverse genetics methods independently and experimentally demonstrated that ACE2 could act as the receptor for SARS‑CoV‑2. Studies have shown that SARS‑CoV‑2 has a higher affinity to human ACE2 than the original SARS virus. SARS‑CoV‑2 may also use basigin to assist in cell entry. Initial spike protein priming by transmembrane protease, serine 2 (TMPRSS2) is essential for entry of SARS‑CoV‑2. The host protein neuropilin 1 (NRP1) may aid the virus in host cell entry using ACE2. After a SARS‑CoV‑2 virion attaches to a target cell, the cell's TMPRSS2 cuts open the spike protein of the virus, exposing a fusion peptide in the S2 subunit, and the host receptor ACE2. After fusion, an endosome forms around the virion, separating it from the rest of the host cell. The virion escapes when the pH of the endosome drops or when cathepsin, a host cysteine protease, cleaves it. The virion then releases RNA into the cell and forces the cell to produce and disseminate copies of the virus, which infect more cells. SARS‑CoV‑2 produces at least three virulence factors that promote shedding of new virions from host cells and inhibit immune response.
If a stepparent legally adopts the partner's child or children, he or she becomes the child's legal parent. In such cases, the parents may stop using the terms stepparent and stepchild and instead refer to the child simply as their son or daughter; depending on the child's degree of affinity for the adoptive parent and/or approval of the legal proceedings culminating in the child's adoption, the child may likewise drop the "step-" designation from his or her description of the relationship. Even when all parties describe the relationship using the terms applied to biological and adoptive families, however, at least some of the emotional and psychological issues common to stepfamilies may or may not persist. Thus, one possibility is that a stepfamily can be reconfigured, and thanks to the biological and adoptive links could leave the condition of a stepfamily.
Sources: en.wikipedia.org
Most studies agree on a Cretaceous age for the most recent common ancestor of modern birds but estimates range from the Early Cretaceous to the latest Cretaceous. Similarly, there is no agreement on whether most of the early diversification of modern birds occurred in the Cretaceous and associated with breakup of the supercontinent Gondwana or occurred later and potentially as a consequence of the Cretaceous–Palaeogene extinction event. This disagreement is in part caused by a divergence in the evidence. Most molecular dating studies suggests a Cretaceous evolutionary radiation, while fossil evidence points to a Cenozoic radiation (the so-called 'rocks' versus 'clocks' controversy). The discovery in 2005 of Vegavis from the Maastrichtian, the last stage of the Late Cretaceous, proved that the diversification of modern birds started before the Cenozoic era. The affinities of an earlier fossil, the possible galliform Austinornis lentus, dated to about 85 million years ago, are still too controversial to provide a fossil evidence of modern bird diversification. In 2020, Asteriornis from the Maastrichtian was described, it appears to be a close relative of Galloanserae, the earliest diverging lineage within Neognathae. Attempts to reconcile molecular and fossil evidence using genomic-scale DNA data and comprehensive fossil information have not resolved the controversy.
== Expression == In insects, CSPs are found throughout the whole insect development process from eggs and larvae to nymphal and adult stages [4, 16-19]. In locusts, they are mainly expressed in the antennae, tarsi and legs, and found to be associated with phase change [3-4, 20-22]. CSPs are not the apanage of insects. They are also expressed in many various organisms such as crustacean, shrimp and many other arthropod species [23]. However, they are not specific to the arthropod kingdom. They are also expressed at the level of the bacterial superkingdom, demonstrating their existence not only in eukaryotes, but also in prokaryote organisms [23-24]. Prokaryote CSPs are twins or identical twins to insect CSPs [24]. They have been reported from bacterial species such as coccobacillus Acinetobacter baumannii, Macrococcus/Staphylococcus caseolyticus, the filamentous actinomycete Kitasatospora griseola, an Actinobacteria genus in the family Streptomycetaceae, and Escherichia coli (E. coli) which are known as common bacteria from the digestive tract, main prokaryotic secondary metabolites, opportunistic multi-drug resistant pathogens, high positive cytochrome c oxidase reactions, and symbionts of multiple insect species [24]. Their existence has been mentioned in plants, but this still needs to be demonstrated experimentally [25-26]. CSPs can be extracted from wasp venom [27]. In moths, nearly all CSPs are expressed in the female pheromone gland [9-14].
wet chemistry Also bench chemistry or classical chemistry. A form of analytical chemistry which uses classical laboratory methods such as simple observation and elementary chemical tests to study chemicals and chemical reactions, i.e. without the use of sophisticated instruments or automated or computerized analysis. It is often used in schools to teach the principles of chemistry to students.
== Family and personal life == Kermani was born in Siegen as the fourth son of Iranian parents who immigrated to the Federal Republic of Germany in 1959. A medical doctor, his father worked at the Catholic St. Mary's Hospital in Siegen. Kermani's three older brothers are also practicing physicians. Navid Kermani has both German and Iranian citizenship. He grew up in the historically Protestant city of Siegen, where he attended the academic high schools Fürst-Johann-Moritz-Gymnasium and Gymnasium am Rosterberg (later renamed Peter-Paul-Rubens-Gymnasium). After graduating from high school, Kermani interned with Roberto Ciulli at the theater Theater an der Ruhr in the city of Mülheim before moving to Cologne in 1988 to pursue university studies. Until 2020, Kermani was married to Islamic studies scholar Katajun Amirpur; they are the parents of two daughters. Kermani has been a fan of the soccer club 1. FC Köln since 1971.
*No known examples The smallest unit forming a homo-oligomer, i.e. one protein chain or subunit, is designated as a monomer, subunit or protomer. The latter term was originally devised to specify the smallest unit of hetero-oligomeric proteins, but is also applied to homo-oligomeric proteins in current literature. The subunits usually arrange in cyclic symmetry to form closed point group symmetries. Although complexes higher than octamers are rarely observed for most proteins, there are some important exceptions. Viral capsids are often composed of multiples of 60 proteins. Several molecular machines are also found in the cell, such as the proteasome (four heptameric rings = 28 subunits), the transcription complex and the spliceosome. The ribosome is probably the largest molecular machine, and is composed of many RNA and protein molecules. In some cases, proteins form complexes that then assemble into even larger complexes. In such cases, one uses the nomenclature, e.g., "dimer of dimers" or "trimer of dimers". This may suggest that the complex might dissociate into smaller sub-complexes before dissociating into monomers. This usually implies that the complex consists of different oligomerisation interfaces. For example, a tetrameric protein may have one four-fold rotation axis, i.e. point group symmetry 4 or C4. In this case the four interfaces between the subunits are identical. It may also have point group symmetry 222 or D2. This tetramer has different interfaces and the tetramer can dissociate into two identical homodimers.
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 rather than a full protein. Proteins generally contain many amino acids joined by alpha-peptide bonds, while glutathione has three residues and an unusual gamma-glutamyl linkage. That structure affects how enzymes recognize and break it down.