thiol group is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2026-08-01. Numbers and descriptions here follow the published literature rather than marketing material.
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.
In cells, glutathione helps maintain the reducing environment of the cytosol and supports enzymes that counteract reactive oxygen species. It acts as a cofactor for glutathione peroxidases, which reduce hydrogen peroxide and lipid peroxides, and for glutathione S-transferases, which conjugate electrophiles. The ratio of GSH to GSSG is often used as an indicator of oxidative stress, although the ratio can vary by compartment and cell type. Glutathione also stores cysteine, an amino acid that can be limiting for protein synthesis and antioxidant defense.
Glutathione synthesis proceeds in two ATP-dependent steps catalyzed by glutamate-cysteine ligase and glutathione synthetase. The first step joins glutamate and cysteine to form gamma-glutamylcysteine and is generally rate-limiting. The second step adds glycine to complete the tripeptide. Cysteine availability, feedback inhibition by glutathione, and oxidative conditions influence flux through this pathway. The pathway is conserved across many organisms, and degradation by gamma-glutamyl transpeptidase and related peptidases recycles amino acids for new synthesis.
Within cells, glutathione serves as a cofactor for glutathione peroxidases and glutathione S-transferases. These enzymes reduce hydrogen peroxide and organic peroxides or conjugate electrophilic compounds to the thiol group. The resulting conjugates can be exported and processed through mercapturic acid pathways. Glutathione also contributes to protein thiol homeostasis and to recycling of other antioxidants such as ascorbate. Its precise roles vary by tissue, and many regulatory effects observed in laboratory systems remain difficult to quantify in whole organisms.
Glutathione is a tripeptide composed of glutamate, cysteine, and glycine. It occurs in nearly all living cells, with highest concentrations in liver, kidney, and red blood cells, and exists in reduced (GSH) and oxidized disulfide (GSSG) forms. The cysteine thiol group enables reversible oxidation and reduction reactions. This property makes glutathione a central participant in cellular redox balance. The balance between these forms is often used as an indicator of oxidative stress.
| Property | Value | Notes |
|---|---|---|
| Chemical formula | C10H17N3O6S | For reduced glutathione; the oxidized dimer has two sulfur atoms. |
| Molar mass | 307.32 g/mol | Calculated for the reduced form. |
| Appearance | White to off-white crystalline powder | Typical for solid reagent; solutions are usually colorless. |
| Solubility | Freely soluble in water | Poorly soluble in nonpolar organic solvents. |
| Typical storage | -20 °C, desiccated, protected from light | Limits oxidation, moisture uptake, and degradation. |
The Federation of Malaya Executive Council comprised 7 official and 7 unofficial members. The Federation of Malaya Legislative Council comprised the high commissioner as the council president, 14 official and 50 unofficial members representing the Straits Settlements, business groups and all races. Additionally, 9 State Council Yang Di Pertua (heads of state), chief ministers and 2 representatives from the Straits Settlements became unofficial members. The Malay Conference of Rulers would advise the high commissioner on immigration issues. The British Resident was replaced with a chief minister in each state of the federation.
Application of a tourniquet to the bitten limb is generally not recommended. There is no convincing evidence that it is an effective first-aid tool as ordinarily applied. Tourniquets have been found to be completely ineffective in the treatment of Crotalus durissus bites, but some positive results have been seen with properly applied tourniquets for cobra venom in the Philippines. Uninformed tourniquet use is dangerous since reducing or cutting off circulation can lead to gangrene, which can be fatal. The use of a compression bandage is generally as effective, and much safer. Cutting open the bitten area, an action often taken before suction, is not recommended since it causes further damage and increases the risk of infection; the subsequent cauterization of the area with fire or silver nitrate (also known as infernal stone) is also potentially threatening. Sucking out venom, either by mouth or with a pump, does not work and may harm the affected area directly. Suction started after three minutes removes a clinically insignificant quantity—less than one-thousandth of the venom injected—as shown in a human study. In a study with pigs, suction not only caused no improvement but led to necrosis in the suctioned area. Suctioning by mouth presents a risk of further poisoning through the mouth's mucous tissues. The helper may also release bacteria into the person's wound, leading to infection.
=== Films and documentaries === In 2005, the Mendonça was adapted and released in the movie "Alice", directed by Marco Martins. It was the winner of the Regards Jeunes award in the Cannes Festival in 2005. In 2019, Mendonça was mentioned in the Netflix documentary, The Disappearance of Madeline McCann. In June 2019, the production of a movie inspired in Mendonça and other missing children was announced, Sombra - Uma Mãe Sabe (Shadow - A Mom Knows). It was also announced that the recording would start in September and would end in November 2019. The script was written by Bruno Gascon. The movie Patrick (2019), directed by Gonçalo Waddington was also compared with the Mendonça case.
Cask ale (or cask-conditioned beer) is unfiltered, unpasteurised beer that is conditioned by a secondary fermentation in a metal, plastic or wooden cask. It is dispensed from the cask by being either poured from a tap by gravity, or pumped up from a cellar via a beer engine (hand pump). Sometimes a cask breather is used to keep the beer fresh by allowing carbon dioxide to replace oxygen as the beer is drawn off the cask. Until 2018, the Campaign for Real Ale (CAMRA) defined real ale as beer "served without the use of extraneous carbon dioxide", which would disallow the use of a cask breather, a policy which was reversed in April 2018 to allow beer served with the use of cask breathers to meet its definition of real ale.
Sources: en.wikipedia.org
=== Labour Party organiser === Galloway joined the Labour Party Young Socialists aged 13, having falsely claimed to have been 15, and was still a teenager when he became secretary of the Dundee Labour Party. Galloway became vice-chairman of the Labour Party in the City of Dundee and a member of the Scottish Executive Committee in 1975. On 5 May 1977, he contested his first election campaign in the Scottish district elections, but failed to hold the safe Labour Gillburn ward in Dundee, being defeated by the independent Bunty Turley. He became the secretary organiser of the Dundee Labour Party in 1977, and at 26, was the youngest ever chairman of the Scottish Labour Party in March 1981, a post he held for a year, after holding the vice-chairman post over the previous year. After a trip to Beirut, Lebanon, during 1977, Galloway became a supporter of Palestine, stating during his libel case against The Daily Telegraph in 2004 that "barely a week after my return I made a pledge, in the Tavern Bar in Dundee's Hawkhill District, to devote the rest of my life to the Palestinian and Arab cause." He supported Dundee City Council when it flew the Palestinian flag over the City Chambers building, and was involved in the twinning of Dundee with the Palestinian West Bank town of Nablus in 1980. In late 1981, in an interview for the Scottish Marxist, Galloway supported the affiliation of the Communist Party of Great Britain (CPGB) to the Labour Party, in the same way as the Fabian Society does.
=== Red yeast rice and statin drugs === In the late 1970s, researchers in the United States and Japan were isolating lovastatin from Aspergillus and monacolins from Monascus, the latter being the same fungus used to make red yeast rice (RYR) when cultured under carefully controlled conditions. Chemical analysis soon showed that lovastatin and monacolin K are identical chemical compounds. The two isolations, documentations, and patent applications occurred months apart. Lovastatin became the patented, prescription drug Mevacor. Red yeast rice went on to become a non-prescription dietary supplement in the United States and other countries. Lovastatin and other prescription statin drugs inhibit cholesterol synthesis by blocking action of the enzyme HMG-CoA reductase. As a consequence, circulating total cholesterol and LDL-cholesterol are lowered by 24–49% depending on the statin and dose. Different strains of Monascus fungus will produce different amounts of monacolins. The 'Went' strain of Monascus purpureus (purpureus=dark red in Latin), when properly fermented and processed, will yield a dried red yeast rice powder that is approximately 0.4% monacolins, of which roughly half will be monacolin K (chemically identical to lovastatin).
=== Sociological === Anorexia nervosa has been increasingly diagnosed since 1950; the increase has been linked to vulnerability and internalization of body ideals. People in professions where there is a particular social pressure to be thin (such as models and dancers) were more likely to develop anorexia, and those with anorexia have much higher contact with cultural sources that promote weight loss. Internet usage heavily leads to deep societal practices of the upkeep of slender body types. Thus leading many to have symptoms of body dissatisfaction and low body image satisfaction. This trend can also be observed for people who partake in certain sports, such as jockeys and wrestlers. There is a higher incidence and prevalence of anorexia nervosa in sports with an emphasis on aesthetics, where low body fat is advantageous, and sports in which one has to make weight for competition. Family group dynamics can play a role in the perpetuation of anorexia including negative expressed emotion in overprotective families where blame is frequently experienced among its members. In the face of constant pressure to be thin, often perpetuated by teasing and bullying, feelings of low self-esteem and self-worth can arise, including the perception that one is not "deserving" of food.
At 10 Downing Street in early September 1964, impasse developed between Douglas-Home and Smith over the best way to measure black public opinion in Southern Rhodesia. A key plank of Britain's Southern Rhodesia policy was that the terms for independence had to be "acceptable to the people of the country as a whole"—agreeing to this, Smith suggested that white and urban black opinion could be gauged through a general referendum of registered voters, and that rural black views could be obtained at a national indaba (tribal conference) of chiefs and headmen. Douglas-Home told Smith that although this proposal satisfied him personally, he could not accept it as he did not believe the Commonwealth, the United Nations or the Labour Party would also do so. He stressed that such a move towards accommodation with Smith might hurt the Conservatives' chances in the British general election the next month, and suggested that it might be in Smith's best interests to wait until after the election to continue negotiations. Smith accepted this argument. Douglas-Home assured Smith that a Conservative government would settle with him and grant independence within a year. Attempting to form a viable white opposition to the Rhodesian Front, the UFP resurrected itself around Welensky, renamed itself the Rhodesia Party, and entered the Arundel and Avondale by-elections that had been called for 1 October 1964.
Coagulative necrosis is characterized by the formation of a gelatinous (gel-like) substance in dead tissues in which the architecture of the tissue is maintained, and can be observed by light microscopy. Coagulation occurs as a result of protein denaturation, causing albumin to transform into a firm and opaque state. This pattern of necrosis is typically seen in hypoxic (low-oxygen) environments, such as infarction. Coagulative necrosis occurs primarily in tissues such as the kidney, heart and adrenal glands. Severe ischemia most commonly causes necrosis of this form. Liquefactive necrosis (or colliquative necrosis), in contrast to coagulative necrosis, is characterized by the digestion of dead cells to form a viscous liquid mass. This is typical of bacterial, or sometimes fungal, infections because of their ability to stimulate an inflammatory response. The necrotic liquid mass is frequently creamy yellow due to the presence of dead leukocytes and is commonly known as pus. Hypoxic infarcts in the brain presents as this type of necrosis, because the brain contains little connective tissue but high amounts of digestive enzymes and lipids, and cells therefore can be readily digested by their own enzymes. Gangrenous necrosis can be considered a type of coagulative necrosis that resembles mummified tissue. It is characteristic of ischemia of lower limb and the gastrointestinal tracts. Both dry gangrene and gas gangrene can lead to this type of necrosis. If superimposed infection of dead tissues occurs, then liquefactive necrosis ensues (wet gangrene).
Sources: en.wikipedia.org
An electronic cigarette (e-cigarette) or vape is a device that simulates tobacco smoking. It consists of an atomizer, a power source such as a battery, and a container such as a cartridge or tank. Instead of smoke, the user inhales vapor, often called "vaping". The atomizer is a heating element that vaporizes a liquid solution called e-liquid that cools into an aerosol of tiny droplets, vapor and air. The vapor mainly comprises propylene glycol or glycerin, usually with nicotine and flavoring. Its exact composition varies, and depends on matters such as user behavior. E-cigarettes are activated by taking a puff or pressing a button. Some look like traditional cigarettes, and most kinds are reusable. Vaping is less harmful than smoking, but still has health risks, particularly for those with asthma. Limited evidence indicates that e-cigarettes are less addictive than smoking, with slower nicotine absorption rates. E-cigarettes containing nicotine are more effective than nicotine replacement therapy (NRT) for smoking cessation, but have not been tested as rigorously as nicotine replacement therapy products.
=== Nanoparticle drug delivery === Delivering medications to the brain has long been a significant challenge in treating neurological diseases. The main reason lies in the blood-brain barrier (BBB), a highly selective, protective layer that shields the brain from toxins and pathogens in the bloodstream. While the BBB is crucial for maintaining brain health, it also makes it difficult for most therapeutic drugs to reach their target, especially in conditions like Alzheimer's and Parkinson's disease. As a result, conventional drug delivery methods often fall short, either causing unwanted side effects or failing to deliver a high enough concentration to be effective. To address this, researchers have turned to nanoparticles, tiny engineered carriers designed to sneak past the BBB and deliver drugs directly to the brain tissue These particles can be tailored to take advantage of the body's own transport systems. For example, by attaching certain molecules to their surfaces, nanoparticles can trigger receptor-mediated transcytosis, a natural process that allows them to pass through cells lining the BBB and enter the brain. This kind of targeted delivery helps reduce the drug's exposure to the rest of the body, lowering the risk of side effects and increasing concentration where it matters most. So far, this strategy has shown promise in delivering treatments to the brain for conditions like Alzheimer's and Parkinson's disease. Several types of nanoparticles are being studied for this purpose.
Degradomics is a sub-discipline of biology encompassing all the genomic and proteomic approaches devoted to the study of proteases, their inhibitors, and their substrates on a system-wide scale. This includes the analysis of the protease and protease-substrate repertoires, also called "protease degradomes". The scope of these degradomes can range from cell, tissue, and organism-wide scales.
This has been cited as an example of the importance of sympathetic influential individuals to the publication of cold fusion papers in certain journals. The decline of publications in cold fusion has been described as a "failed information epidemic". The sudden surge of supporters until roughly 50% of scientists support the theory, followed by a decline until there is only a very small number of supporters, has been described as a characteristic of pathological science. The lack of a shared set of unifying concepts and techniques has prevented the creation of a dense network of collaboration in the field; researchers perform efforts in their own and in disparate directions, making the transition to "normal" science more difficult. Cold fusion reports continued to be published in a few journals like Journal of Electroanalytical Chemistry and Il Nuovo Cimento. Some papers also appeared in Journal of Physical Chemistry, Physics Letters A, International Journal of Hydrogen Energy, and a number of Japanese and Russian journals of physics, chemistry, and engineering. Since 2005, Naturwissenschaften has published cold fusion papers; in 2009, the journal named a cold fusion researcher to its editorial board. In 2015 the Indian multidisciplinary journal Current Science published a special section devoted entirely to cold fusion related papers.
Sources: en.wikipedia.org
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.
It is synthesized in the body from amino acids, so it is not classified as an essential dietary nutrient for most people. Dietary and supplemental forms are studied for their effects on tissue levels and health markers. Evidence varies by population and outcome.
The phrase highlights its high intracellular concentration and its role in several antioxidant and detoxification reactions. It is not the only antioxidant, and the term can oversimplify its functions. Scientific descriptions usually specify the pathway or enzyme involved.
GSH is the reduced thiol form, while GSSG is the disulfide-linked oxidized dimer. The GSH:GSSG ratio is used as a redox indicator, though the ratio can vary with sample handling and cell type.