The short version of thiol group fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2025-12-01. Anything still debated is marked as such rather than presented as settled.
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.
Glutathione functions in redox balance, detoxification, and sulfur amino acid storage. It participates in reactions that help maintain ascorbate and protein thiol status. The molecule serves as a cofactor for several enzymes, including glutathione peroxidases and glutathione S-transferases. These enzymes reduce peroxides and conjugate electrophiles, respectively. Glutathione also contributes to the metabolism of xenobiotics and to the transport of cysteine between tissues. How interorgan transport and tissue-specific regulation shape whole-body pools remains an active area of study.
Glutathione is a tripeptide composed of glutamate, cysteine, and glycine. Its cysteine residue carries a thiol group, which allows the molecule to participate in reduction and oxidation reactions. The compound exists in most living cells, where the reduced form, often abbreviated GSH, is usually more abundant than the oxidized disulfide form, GSSG. Intracellular concentrations are commonly in the millimolar range, while extracellular concentrations are much lower. This uneven distribution supports its role as a major cellular redox buffer.
Cells synthesize glutathione through two ATP-dependent enzymatic steps. The first step combines glutamate and cysteine to form gamma-glutamylcysteine, catalyzed by glutamate-cysteine ligase. The second step adds glycine, producing the complete tripeptide, catalyzed by glutathione synthetase. Glutathione itself can inhibit the first enzyme, providing negative feedback when levels are high. Because cysteine is often limiting, its availability influences how quickly the pathway proceeds. These reactions occur in the cytosol, and the resulting glutathione can be distributed to other compartments.
| 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. |
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.
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.
Glutathione participates in detoxification reactions, amino acid transport, and the maintenance of protein thiols. It serves as a cofactor for several enzymes, including glutathione peroxidases and glutathione S-transferases. In research literature, altered glutathione status appears in studies of aging, infection, metabolic stress, and environmental exposure. Whether low glutathione is a cause, consequence, or marker of such conditions often remains unresolved. Direct measurement in blood or tissue provides a snapshot, but results depend on sample handling, timing, and the method used.
Glutathione is a small tripeptide made of glutamic acid, cysteine, and glycine. Its cysteine thiol group allows reversible oxidation and reduction, making it central to cellular redox chemistry. The reduced form, often abbreviated GSH, predominates inside most cells, while the oxidized disulfide form, GSSG, forms when two GSH molecules react. The ratio of GSH to GSSG is widely used as an indicator of oxidative stress in laboratory research, though it does not by itself diagnose a clinical condition.
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.
== Career == Dandridge began her career appearing in Chicago theatre productions. She has gained a wider audience as the voice of Alyx Vance in the award-winning action game Half-Life 2 and its sequels, Episode One and Episode Two, and also as Marlene in The Last of Us. In 2006, she was cast as Kala in the original Broadway production of Tarzan. Dandridge earned a BAFTA Award for her voiceover performance in the 2015 game Everybody's Gone to the Rapture. On television, she guest starred on NCIS, 24, Criminal Minds, The Newsroom and Drop Dead Diva. In 2022, she was cast in a series regular role as Chief in the ABC drama series Station 19. Dandridge also had the recurring roles in the FX drama series, Sons of Anarchy as Rita Roosevelt, and short-lived The CW teen soap Star-Crossed in 2014. In 2015, she co-starred in the second season of NBC medical drama, The Night Shift as Gwen Gaskin. In 2015, Dandridge was cast as the lead character in the Oprah Winfrey Network drama series, Greenleaf opposite Lynn Whitfield. She plays the role of Grace Greenleaf, Greenleaf's estranged daughter. Dandridge has received critical acclaim for her first leading screen role. From November 9, 2017, to January 7, 2018, Dandridge starred as Papa Ge the God of Death in the Broadway musical revival of Once on This Island, at the Circle in the Square Theater. She returned to the role of Papa Ge in a limited run from June 18 to August 19, 2018. Along with cast, she received Grammy Award for Best Musical Theater Album nomination for cast recording.
=== Plant breeding === Selective breeding of cannabis plants has expanded and diversified as commercial and therapeutic markets develop. Some growers in the US succeeded in lowering the proportion of CBD-to-THC to accommodate customers who preferred varietals that were more mind-altering due to the higher THC and lower CBD content. In the US, hemp is classified by the federal government as cannabis containing no more than 0.3% THC by dry weight. This classification was established in the 2018 Farm Bill and was refined to include hemp-sourced extracts, cannabinoids, and derivatives in the definition of hemp.
Barnsley have played their home games in red shirts for most of their history. The only exception to this is the period 1887–1901, where it is speculated that the team first wore blue shirts with claret arms, then circa 1890 the team wore chocolate and white stripes, before moving on to blue and white stripes around 1898. The team first wore red shirts in 1901. Since this time, the team have worn red shirts often with a white trim, although in more recent times a black trim has sometimes been used. As with most football clubs the shirt design varies from season to season. One particular design that stands out is the 1989–90 season shirt which featured white stars on a red background and has been named as one of the worst shirts ever. Manufacturers logos were added to the shirt in 1976–77, while sponsors were first added in the 1980–81 season.
Macrocrystalline aqueous suspensions of progesterone as well as microspheres of progesterone were investigated as potential progestogen-only injectable contraceptives and combined injectable contraceptives (with estradiol) by the late 1980s and early 1990s but were never marketed. Aqueous solutions of water-insoluble steroids were first developed via association with colloid solubility enhancers in the 1940s. An aqueous solution of progesterone for use by intravenous injection was marketed by Schering AG under the brand name Primolut Intravenous by 1962. One of its intended uses was the treatment of threatened abortion, in which rapid-acting effect was desirable. An aqueous solution of progesterone complexed with cyclodextrin to increase its water solubility was introduced for use by once-daily subcutaneous injection in Europe under the brand name Prolutex in the mid-2010s. In the 1950s, long-acting parenteral progestins such as hydroxyprogesterone caproate, medroxyprogesterone acetate, and norethisterone enanthate were developed and introduced for use by intramuscular injection. They lacked the need for frequent injections and the injection site reactions associated with progesterone by intramuscular injection and soon supplanted progesterone for parenteral therapy in most cases.
5 July Results of the 2024 United Kingdom general election: Sir Keir Starmer becomes the prime minister of the United Kingdom, following a landslide victory for Labour in the general election. The Conservatives are reduced to just 121 seats, the lowest number of MPs in their 190-year history. Among the high-profile losses are former Prime Minister Liz Truss, former cabinet minister Sir Jacob Rees-Mogg, Commons leader Penny Mordaunt, and Defence Secretary Grant Shapps. The Liberal Democrats, led by Sir Ed Davey, achieve their best ever result with 71 seats. The Green Party achieve their best ever result, quadrupling their number of seats to four. Reform UK gain their first seats in Parliament, which includes party leader Nigel Farage taking the constituency of Clacton. The SNP suffers heavy losses, going from 48 seats to just nine. Starmer ministry: Starmer appoints his first cabinet. Angela Rayner becomes Deputy Prime Minister Rachel Reeves becomes Chancellor of the Exchequer David Lammy becomes Foreign Secretary Yvette Cooper becomes Home Secretary John Healey becomes Defence Secretary 6 July Starmer holds his first press conference as prime minister, during which he confirms that the Rwanda deportation scheme is "dead and buried". Euro 2024: After finishing 1–1 at the end of extra time, England beat Switzerland 5–3 on penalties, taking them through to the semi-finals. Andy Murray's Wimbledon career comes to an end after Emma Raducanu withdraws from the mixed doubles.
Sources: en.wikipedia.org
The epidermis is composed of the outermost layers of the skin. It forms a protective barrier over the body's surface, responsible for keeping water in the body and preventing pathogens from entering, and is a stratified squamous epithelium, composed of proliferating basal and differentiated suprabasal keratinocytes. Keratinocytes are the major cells, constituting 95% of the epidermis, while Merkel cells, melanocytes and Langerhans cells are also present. The epidermis can be further subdivided into the following strata or layers (beginning with the outermost layer):
Although the concept of equilibrium is widely used across sciences, in the context of chemistry, it arises whenever a number of different states of the chemical composition are possible, as for example, in a mixture of several chemical compounds that can react with one another, or when a substance can be present in more than one kind of phase. A system of chemical substances at equilibrium, even though having an unchanging composition, is most often not static; molecules of the substances continue to react with one another thus giving rise to a dynamic equilibrium. Thus the concept describes the state in which the parameters such as chemical composition remain unchanged over time.
Since Xi became general secretary, censorship has stepped up. Xi has overseen the increased coordination and consolidation of censorship authorities, raising their efficiency, and under his leadership censorship practices have tightened. Xi has called on for more positive energy at Chinese media, referring to the need for uplifting messages as opposed to critical or negative ones. In August 2013, he gave what became known as the August 19 speech, emphasizing the guiding role of ideology in propaganda. At the Symposium on News Reporting and Public Opinion in 2016, Xi stated that "party and government-owned media must hold the family name of the party" and that the state media "must embody the party's will, safeguard the party's authority". Xi's administration has overseen more Internet restrictions imposed, and is described as being "stricter across the board" on speech than previous administrations. In 2013, the State Internet Information Office summoned influential bloggers to a seminar to instruct them to avoid writing about politics, the CCP, or making statements contradicting official narratives. Many bloggers stopped writing about controversial topics, and Weibo went into decline, with much of its readership shifting to WeChat users speaking to limited social circles. The SIIO also formulated the Seven Bottom Lines, which serve as the bottom lines that internet users and social media companies in China must adhere to.
=== Treating trauma and painful wounds === Persistent chronic pain associated with non-healing wounds is caused by tissue (nociceptive) or nerve (neuropathic) damage and is influenced by dressing changes and chronic inflammation. Chronic wounds take a long time to heal and patients can experience chronic wounds for many years. Chronic wound healing may be compromised by coexisting underlying conditions, such as venous valve backflow, peripheral vascular disease, uncontrolled edema and diabetes mellitus. If wound pain is not assessed and documented it may be ignored and/or not addressed properly. It is important to remember that increased wound pain may be an indicator of wound complications that need treatment, and therefore practitioners must constantly reassess the wound as well as the associated pain. Optimal management of wounds requires holistic assessment. Documentation of the patient's pain experience is critical and may range from the use of a patient diary, (which should be patient driven), to recording pain entirely by the healthcare professional or caregiver. Effective communication between the patient and the healthcare team is fundamental to this holistic approach. The more frequently healthcare professionals measure pain, the greater the likelihood of introducing or changing pain management practices. At present there are few local options for the treatment of persistent pain, whilst managing the exudate levels present in many chronic wounds.
Sources: en.wikipedia.org
== Properties == Cyclo Olefin Polymer (COP) has superior physical properties that make it well suited for medical and optical applications. It exhibits high purity, low extractables and leachables, has low surface energy, and it is chemically inert. Various fabrication methods can be used including compression molding, injection molding, laser ablation, and film extrusion to name a few. It is compatible with sterilization methods including newly developed NO2 processes. COP has exceptional optical clarity and exhibits extremely low birefringence which makes it well suited for optical applications such as virtual reality. COP and COC are not compatible with non-polar solvents but have good chemical resistance to other solvents, acids and bases.
The energy released by reactions of oxygen and reduced compounds such as cytochrome c and (indirectly) NADH and FADH2 is used by the electron transport chain to pump protons into the intermembrane space, generating the electrochemical gradient over the inner mitochondrial membrane. In photosynthetic eukaryotes, the electron transport chain is found on the thylakoid membrane. Here, light energy drives electron transport through a proton pump and the resulting proton gradient causes subsequent synthesis of ATP. In bacteria, the electron transport chain can vary between species but it always constitutes a set of redox reactions that are coupled to the synthesis of ATP through the generation of an electrochemical gradient and oxidative phosphorylation through ATP synthase.
The relatively quick heteronuclear single quantum correlation experiment helps determine the feasibility of doing subsequent longer, more expensive, and more elaborate experiments. It is not possible to assign peaks to specific atoms from the heteronuclear single quantum correlation alone.
=== Hydrogen Isotope Analysis === Hydrogen isotope analysis is used to help reconstruct environmental change. Dinosterol is a particularly good target for such analysis because it is commonly found in high concentrations in a variety of aquatic environments and is well preserved in the sediment record. Hydrogen isotope analysis requires a purification method that achieves GC baseline resolution and is high yielding. Dinosterol coelutes with other sterols during GC; therefore a procedure for proper purification that involves reversed phase-high performance liquid chromatography (RP-HPLC) was developed by Atwood et al. The hydrogen isotope ratios in dinosterol can be used to reconstruct salinity semi-quantitatively. In a study by Schwab et al., the hydrogen isotope ratio of dinosterol was measured in suspended particles and surface sediments from the Chesapeake Bay estuary. The D/H ratio was found to decrease by 0.99 ± 0.23% per unit increase in salinity over the salinity range 10–29 PSU. The correlation between hydrogen isotopic response and salinity may result from diminished exchange of water between algal cells and their environment, lower growth rates and/or increased production of osmolytes at high salinities.
For services to People with Autism and their Families in Oxfordshire. Elizabeth Craig Ovens. Director, McCaskies Butchers. For services to Retail and to the Economy in Scotland. Alfred Oluwafemi Oyekoya. Director, Black Asian Minority Ethnic Mental Health Support. For services to Minority Ethnic Communities in Wales. Caroline Rebecca Paige. For services to Armed Forces Personnel and Veterans. The Reverend Canon Dr. Crispin Alexander Pailing. Member, Merseyside Resilience Forum and Safety Advisory Group. For services to the community in Liverpool, Merseyside. Blair Parham. Director of Music and Principal Conductor, Scottish Fiddle Orchestra. For services to Scottish Music. Satish Manilal Parmar. Senior Policy Adviser, Department for Work and Pensions. For Public Service. Carys Parry. Voluntary Party Manager, Conservative Party. For Political Service. Imran Adam Patel. For services to the community in Blackburn, Lancashire. Wolodymyr Pawluk. Chair, London Branch, Association of Ukrainians in Great Britain and Member, National Executive Committee, Ukrainian Youth Association. For services to the Ukrainian Community. Ewan Benjamin Payne. Team UK Gold Medal Winner, WorldSkills UK. For services to Further Education. Catherine Penny. For services to Plant Heritage and to the community in North Preston, Lancashire. Professor Yvonne Perrie. Professor of Drug Delivery and Head, Institute for Pharmacy and Biomedical Sciences. For services to Pharmaceutical Innovation and Regulation. Timothy Foster Pick.
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.
Glutathione is built from three amino acids: glutamate, cysteine, and glycine. The linkage involves the gamma-carboxyl group of glutamate rather than the alpha-carboxyl group, which is unusual for peptides. This structure protects the bond from some common peptidases.