If you have been reading about redox balance 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.
Last reviewed on 2026-01-31. Where a claim depends on a specific study, the study is described rather than over-claimed.
In cells, glutathione exists mainly in a reduced form called GSH. When two GSH molecules react, they form oxidized glutathione, or GSSG, which contains a disulfide bond. The ratio of GSH to GSSG is often used as an indicator of oxidative stress. Enzymes such as glutathione peroxidase and glutathione reductase help cycle the molecule between these two states. This cycling supports antioxidant defense, detoxification of reactive molecules, and regulation of certain signaling pathways.
Glutathione is present in most tissues, with especially high concentrations in the liver. It also serves as a cofactor for some enzymes and helps transport amino acids across cell membranes. In plants and microorganisms, glutathione contributes to stress responses and metal handling. The molecule is synthesized in two ATP-dependent steps, first producing gamma-glutamylcysteine and then adding glycine. Because cysteine availability often limits synthesis, dietary and metabolic factors can influence glutathione levels. Research continues to examine how these levels relate to health and disease.
Synthesis occurs in two ATP-dependent steps. The enzyme glutamate-cysteine ligase joins glutamate and cysteine to form gamma-glutamylcysteine, and glutathione synthetase adds glycine. The first step is rate-limiting and is influenced by cysteine availability and feedback inhibition by GSH. Breakdown involves gamma-glutamyl transferase and subsequent peptidases, which release constituent amino acids for reuse. Because turnover differs among tissues, measurements from blood, plasma, and tissues are not directly interchangeable. Research continues to clarify how compartment-specific pools are regulated in health and disease.
Glutathione is a tripeptide composed of glutamate, cysteine, and glycine. It contains an unusual gamma-glutamyl bond between glutamate and cysteine, which resists cleavage by many peptidases. The reduced form, GSH, carries a thiol group on cysteine and is the dominant intracellular form in most cells. Its structure allows it to participate in redox reactions and to serve as a sulfur donor. The oxidized form, GSSG, consists of two GSH molecules joined by a disulfide bond.
| Property | Value | Notes |
|---|---|---|
| Common name | Glutathione | Tripeptide of glutamate, cysteine, and glycine |
| Reduced form | GSH | Dominant intracellular thiol |
| Oxidized form | GSSG | Disulfide-linked dimer |
| Molar mass | 307.32 g/mol | For reduced glutathione |
| Functional motif | Gamma-glutamyl-cysteinyl-glycine | Gamma linkage resists many peptidases |
Biosynthesis proceeds in two ATP-dependent steps. First, glutamate-cysteine ligase joins glutamate and cysteine. Second, glutathione synthetase adds glycine to the intermediate. The pathway is regulated by cysteine availability, enzyme expression, and feedback inhibition by glutathione itself. Liver tissue has a particularly high capacity for synthesis and export. Because the molecule is made inside cells, circulating glutathione reflects a balance of release, uptake, and breakdown rather than simple dietary supply.
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.
Because GSH is central to redox balance, its status is studied in aging, liver disease, neurodegenerative conditions, and metabolic disorders. Observational studies often report lower GSH or higher GSSG in affected tissues, but such associations do not establish that raising glutathione changes disease outcomes. Oral glutathione is digested into amino acids, and whether intact absorption occurs remains debated; precursors such as N-acetylcysteine and cysteine donors are also investigated. Regulatory agencies generally treat glutathione as a dietary supplement, not an approved drug, and clinical claims require evidence from controlled trials.
Glutathione is a small tripeptide composed of glutamate, cysteine, and glycine, with the unusual gamma-glutamyl linkage between glutamate and cysteine. Its cysteine thiol group makes it a major non-enzymatic antioxidant in cells. The reduced form, GSH, predominates in most intracellular compartments, while the oxidized disulfide form, GSSG, is produced when GSH reduces reactive oxygen species. Intracellular concentrations often reach millimolar levels, whereas plasma concentrations are much lower, typically in the low micromolar range. This gradient reflects active synthesis, transport, and consumption rather than passive distribution.
Several analytical methods can quantify glutathione, including high-performance liquid chromatography (HPLC) with UV or fluorescence detection for separating GSH and GSSG. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) offers higher specificity and sensitivity, often detecting nanomolar concentrations. The enzymatic recycling assay, often called the Tietze method, measures total glutathione by coupling reduction of GSSG to a colorimetric or fluorometric readout. Capillary electrophoresis and electrochemical detection are also used in specialized laboratories. Each method has distinct advantages and limitations regarding throughput, cost, and susceptibility to interference.
Interpreting glutathione measurements requires attention to pre-analytical variables. The GSSG concentration in a sample can rise artificially during storage or processing, making the GSH/GSSG ratio unreliable if not controlled. Reference ranges vary by specimen type, assay, and population, so comparisons across studies are difficult. Plasma glutathione is low and sensitive to hemolysis, while whole blood reflects primarily erythrocyte content. Many studies measure total glutathione rather than the reduced and oxidized forms separately, which limits conclusions about redox status.
=== September === 1 September – John Swinney gives his keynote speech to the SNP Annual Conference, saying that he will put the "people's priorities" at the heard of the Scottish Government, and that he will work to convince voters that Scottish independence is the "route" to delivering a fairer and stronger country. 2 September – The Scottish Government confirms that all young offenders under the age of 18 have been removed from Scotland's young offenders' institutions and transferred to more child-friendly accommodation. 3 September – In a statement to the Scottish Parliament, Finance Secretary Shona Robison outlines £500m of spending cuts. She argues the cuts are needed because of an additional £800m in financial costs brought about by public sector pay deals, austerity from Westminster, inflation, the COVID-19 pandemic and the Russian invasion of Ukraine. BBC News reports that the headquarters of GB Energy, the new government-backed energy company, will be in Aberdeen. Members of the Unison trade union working for councils in Scotland reject an annual pay increase offer worth 3.6%, equivalent to at least £1,292. 4 September – The Scottish Government abandons an unfulfilled commitment to expand free school meals to all primary school pupils. 5 September – Scottish rugby player Scott Hastings confirms his wife, Jenny Hastings, has been reported missing after disappearing at a location used for wild swimming in the Firth of Forth on 3 September.
Colombia's varied cuisine is influenced by its diverse fauna and flora as well as the cultural traditions of the ethnic groups. Colombian dishes and ingredients vary widely by region. Some of the most common ingredients are: cereals such as rice and maize; tubers such as potato and cassava; assorted legumes; meats, including beef, chicken, pork and goat; fish; and seafood. Colombia cuisine also features a variety of tropical fruits such as cape gooseberry, feijoa, arazá, dragon fruit, mangosteen, granadilla, papaya, guava, mora (blackberry), lulo, soursop and passionfruit. Colombia is one of the world's largest consumers of fruit juices. Among the most representative appetizers and soups are patacones (fried green plantains), sancocho de gallina (chicken soup with root vegetables) and ajiaco (potato and corn soup). Representative snacks and breads are pandebono, arepas (corn cakes), aborrajados (fried sweet plantains with cheese), torta de choclo, empanadas and almojábanas. Representative main courses are bandeja paisa, lechona tolimense, mamona, tamales and fish dishes (such as arroz de lisa), especially in coastal regions where kibbeh, suero, costeño cheese and carimañolas are also eaten. Representative side dishes are papas chorreadas (potatoes with cheese), remolachas rellenas con huevo duro (beets stuffed with hard-boiled egg) and arroz con coco (coconut rice). Organic food is a current trend in big cities, although in general across the country the fruits and veggies are very natural and fresh.
=== Pharmacodynamics === Mesocarb has been found to act as a selective dopamine reuptake inhibitor (DRI) by blocking the actions of the dopamine transporter (DAT), and lacks the dopamine release characteristic of stimulants such as dextroamphetamine. It was the most selective DAT inhibitor amongst an array of other DAT inhibitors to which it was compared and, in 2017, was reported as the most selective DAT inhibitor described to date. The affinities (Ki) of mesocarb at the human monoamine transporters in vitro have been reported to be 8.3 nM for the dopamine transporter (DAT), 1,500 nM for the norepinephrine transporter (NET) (181-fold lower than for the DAT), and >10,000 nM for the serotonin transporter (SERT) (>1,205-fold lower than for the DAT). The inhibitory potencies (IC50Tooltip half-maximal inhibitory concentration) of mesocarb at the human monoamine transporters in vitro have been reported to be 0.49 ± 0.14 μM at the DAT, 34.9 ± 14.08 μM at the NET (71-fold lower than for the DAT), and 494.9 ± 17.00 μM at the SERT (1,010-fold lower than for the DAT). In 2021, it was discovered that mesocarb is not a conventional DRI but acts as a DAT allosteric modulator or non-competitive inhibitor. In accordance with its nature as an atypical DAT blocker, the drug has atypical effects relative to conventional DRIs. As an example, it shows greater antiparkinsonian activity relative to other DRIs in animals. Similarly to other DRIs, mesocarb has been found to possess wakefulness-promoting effects.
There are over 22 million people of Han Chinese ancestry in living in Taiwan. At first, these migrants chose to settle in locations that bore a resemblance to the areas they had left behind in China, regardless of whether they arrived in the north or south of Taiwan. Hoklo immigrants from Quanzhou settled in coastal regions and those from Zhangzhou tended to gather on inland plains, while the Hakka inhabited hilly areas. Clashes and tensions between the two groups over land, water, ethno-racial, and cultural differences led to the relocation of some communities and over time, varying degrees of intermarriage and assimilation took place. In Taiwan, Han Chinese (including both the earlier Han Taiwanese settlers and the recent Chinese that arrived in Taiwan with Chiang Kai-shek in 1949) constitute over 95% of the population. They have also been a politically, culturally and economically dominant majority vis-à-vis the non-Han indigenous Taiwanese peoples.
After the Netherlands in World War II in 1945, Korvezee returned to Delft, initially serving as a curator and, from 1948, as a lecturer in theoretical chemistry. Although an expert in radioactivity, she had no role in the planning of the reactor center later built on the university's grounds. When the chair became vacant following Scheffer's retirement, Korvezee was passed over once more. In 1954, the Department of Chemical Technology created an extraordinary professorship for her in the emerging field of theoretical chemistry largely regarded as compensation for the chairs she had earlier missed. Her appointment on 14 April 1954, making her the first female professor at Delft, received extensive press coverage. As a full professor, however, she retained the salary of her former lectureship. As professor, Korvezee supervised doctoral and master's students and published more than forty scientific works before 1940, many co-authored with fellow female assistants. She was a member of the Association of Women with an Academic Education (VVAO), though she was never actively involved in the women's movement despite being widely regarded as a feminist figure.
Sources: en.wikipedia.org
RNA polymerase III performs "intrinsic-like" termination. The majority of genes transcribed by RNAP III have a poly(dT) region. However, although poly(dT) pauses every RNA polymerase, it alone cannot be insufficient; some other mechanism must destabilize the clamp. In RNAP III, some poly(dT) sites are indeed occasionally read-through: some genes have multiple such regions, allowing transcripts of different lengths to be produced. The instability of rU:dA hybrids likely is essential to termination by RNAP III. Parts of core subunits C1 and C2, as well as "subcomplexes" C53/37 and C11 are functionally important. A number of extraneous factors can modify the termination behavior. Rho factor WebGeSTer Trp operon
(Cm, Z=96): Curium-247, 1.64 × 107 years / 1.56 × 107 years (Am, Z=95): Americium-243; 7,370 years (Bk, Z=97): Berkelium-247; 1.4 × 103 years / 1380 years (Cf, Z=98): Californium-251; 898 years (Es, Z=99): Einsteinium-252; 471.7 days (Fm, Z=100): Fermium-257; 100.5 days (Md, Z=101): Mendelevium-258; 51.5 days (Lr, Z=103): Lawrencium-262; 3.6 hours = 216 minutes (No, Z=102): Nobelium-259; 58 minutes (Rf, Z=104): Rutherfordium-263; approximately 10 minutes (Sg, Z=106): Seaborgium-269; 5 ± 2 minutes (Bh, Z=107): Bohrium-270; approximately 61 seconds
Sanofi's application was considered by the same Endocrinologic and Metabolic Drugs Advisory FDA Committee that was considering lixisenatide as a single agent. In May 2016 by a vote of 12–2, with several members of the committee expressing reservations about Sanofi's plans to offer two pens with different ratios of insulin glargine and lixisenatide - one for people who had never taken insulin before and one for people who had; there was also concern about how to handle dosing when switching people from a single drug regimen to the combination drug. In August 2016 the FDA told Sanofi that it was delaying a final decision for three months, and asked Sanofi for more data on how people used the delivery devices. In November 2016, the FDA approved Sanofi's Soliqua formulation (insulin glargine 100 units/mL and lixisenatide 33 mcg/mL). Soliqua became available in American pharmacies in January 2017.
SLC is the root name (SoLute Carrier) n = an integer representing a family (e.g., 1-52) X = a single letter (A, B, C, ...) denoting a subfamily m = an integer representing an individual family member (isoform). For example, SLC1A1 is the first isoform of subfamily A of SLC family 1. An exception occurs with SLC family 21 (the organic anion transporting polypeptide transporters), which for historical reasons have names in the format SLCOnXm where n = family number, X = subfamily letter, and m = member number. While the HGNC only assign nomenclature to human genes, by convention vertebrate orthologs of these genes adopt the same nomenclature (e.g., VGNC-assigned orthologs of SLC10A1). For rodents, the case of the symbols differs from other vertebrates by using title case, i.e. Slc1a1 denotes the rodent ortholog of the human SLC1A1 gene.
Sources: en.wikipedia.org
=== Conservation and sustainability === E. longifolia is mainly used for its roots, which necessitates uprooting the entire plant when it is harvested. This has led to concerns over the long-term sustainability of its use. In Malaysia raw E. longifolia is banned from export, and the plant itself been listed as one of the priority species for conservation, and the harvesting of wild trees is restricted according to Act 686 on International Trade in Endangered Species. In 2016, Ahmad Shabery Cheek, the Malaysian Minister of Agriculture, said that the species may go extinct within twenty years if cultivation and replanting efforts are not made quickly. To support commercialization, the Malaysian government made attempts to encourage the long-term commercial cultivation of the plant, through the provision of grants for farmers, enabling agronomy research by MARDI, and the formation of cluster farms under the East Coast Economic Region.
It is also being investigated for use in removing contaminants from drinking water. Nano Silver: Nano Silver is being incorporated into textiles, clothing, food packaging, and other materials to eliminate bacteria. EPA and the U.S. Consumer Product Safety Commission are studying certain products to see whether they transfer nano-size silver particles in real-world scenarios. EPA is researching this topic to better understand how much nano-silver children come in contact with in their environments. Iron: While nano-scale iron is being investigated for many uses, including "smart fluids" for uses such as optics polishing and as a better-absorbed iron nutrient supplement, one of its more prominent current uses is to remove contamination from groundwater. This use, supported by EPA research, is being piloted at a number of sites across the United States.
The first isolation of deoxyribonucleic acid (DNA) was done in 1869 by Friedrich Miescher. DNA extraction is the process of isolating DNA from the cells of an organism isolated from a sample, typically a biological sample such as blood, saliva, or tissue. It involves breaking open the cells, removing proteins and other contaminants, and purifying the DNA so that it is free of other cellular components. The purified DNA can then be used for downstream applications such as PCR, sequencing, or cloning. Currently, it is a routine procedure in molecular biology or forensic analyses. This process can be done in several ways, depending on the type of the sample and the downstream application, the most common methods are: mechanical, chemical and enzymatic lysis, precipitation, purification, and concentration. The specific method used to extract the DNA, such as phenol-chloroform extraction, alcohol precipitation, or silica-based purification. For the chemical method, many different kits are used for extraction, and selecting the correct one will save time on kit optimization and extraction procedures. PCR sensitivity detection is considered to show the variation between the commercial kits. There are many different methods for extracting DNA, but some common steps include:
transuranic elements Also transuranium elements. The set of chemical elements with an atomic number greater than 92, i.e. occurring after uranium in the periodic table. None of the transuranic elements are stable in naturally occurring conditions.
==== Malaysia ==== Sup torpedo (lit. 'torpedo soup'; also sup hameed) is a Malaysian Indian cuisine bull penis curry soup, a delicacy of mamak stalls typically served with roti benggali. The soup is typically eaten as an aphrodisiac; variations include sup torpedo campur, which includes goat's testicles and horse penis. The Mufti of Federal Territory's Office opines that eating sup torpedo, although halal, is makruh for being genital meat.
Sources: en.wikipedia.org
Glutathione is a tripeptide made from glutamate, cysteine, and glycine. Its cysteine residue provides a thiol group that is central to its redox activity. The glutamate-cysteine bond forms through the gamma-carboxyl group of glutamate.
Reduced glutathione, GSH, can donate electrons and become oxidized to GSSG. The balance between these forms reflects the cell's redox environment. A shift toward GSSG is commonly interpreted as evidence of oxidative stress, though the ratio can vary by tissue and method.
Glutathione occurs in nearly all cell types, with notable amounts in the liver. It is also present in the lungs, kidneys, and red blood cells. Concentrations differ among tissues and change with age, diet, and disease states.
GSH is the reduced form with a free thiol group, while GSSG is the oxidized disulfide-linked dimer. Most assays distinguish the two because their balance reflects redox conditions. The names are not interchangeable.