The short version of thiol fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-07-18 and is reviewed periodically as new material appears.
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.
Glutathione serves as a cofactor for several enzymes, including glutathione peroxidase and glutathione S-transferase. These enzymes help reduce hydrogen peroxide and lipid peroxides, and they conjugate reactive electrophiles for excretion. The molecule also acts as a reservoir for cysteine, an amino acid that is prone to oxidation. In addition, glutathione participates in the metabolism of nitric oxide, leukotrienes, and prostaglandins. Its roles extend to cell signaling, apoptosis, and the regulation of protein function through S-glutathionylation.
Glutathione is a tripeptide composed of glutamate, cysteine, and glycine, and it is the most abundant non-protein thiol in most living cells. The reduced form, GSH, carries a sulfhydryl group that can donate electrons, while the oxidized form, GSSG, forms when two GSH molecules link via a disulfide bond. The balance between these two forms helps define the cellular redox environment, and their ratio is often used as an indicator of oxidative stress. Because the sulfhydryl group is reactive, glutathione participates in many cellular processes, including detoxification and protein regulation.
Glutathione is synthesized in two ATP-dependent steps. First, gamma-glutamylcysteine synthetase links glutamate and cysteine; second, glutathione synthetase adds glycine to form the complete tripeptide. The pathway is feedback-inhibited by GSH itself, which helps maintain steady intracellular levels. Tissues vary widely in glutathione content, with the liver typically containing the highest concentrations, followed by the kidneys, lungs, and erythrocytes. Because cysteine is often limiting, its availability influences synthesis rates, and regulation of this pathway varies by cell type.
| Property | Value | Notes |
|---|---|---|
| Chemical formula | C10H17N3O6S | Refers to the reduced form |
| Molar mass | 307.32 g/mol | Calculated for the neutral molecule |
| Appearance | White crystalline powder | Often hygroscopic; protect from moisture |
| Water solubility | Soluble in water | Reported values vary with purity and form |
| Alternative names | GSH, reduced glutathione | GSH specifies the thiol form |
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.
Measuring glutathione in biological samples requires attention to oxidation, because GSH can convert to GSSG after sample collection. Blood and plasma samples are often treated with acid or alkylating agents to preserve the reduced form. Without stabilization, apparent GSH concentrations can fall while GSSG rises. Differences in sample type, handling delay, and deproteinization method can produce results that are not comparable across studies. Reporting preanalytical details is therefore important for interpreting findings.
Common analytical approaches include enzymatic recycling assays, high-performance liquid chromatography, and mass spectrometry. Enzymatic recycling measures total glutathione after converting GSSG back to GSH, while separation methods can quantify GSH and GSSG separately. Derivatization may be used to improve detection or stability during analysis. LC-MS/MS offers high specificity and can distinguish glutathione from related thiols and adducts. Each method has different sensitivity, throughput, and susceptibility to interference, so method selection depends on the study question and sample matrix.
Cells synthesize glutathione through two ATP-dependent steps: glutamate-cysteine ligase joins glutamate and cysteine, and glutathione synthetase adds glycine to form the complete tripeptide. Breakdown occurs through gamma-glutamyl transpeptidase and subsequent peptidase reactions, forming the gamma-glutamyl cycle. Within cells, glutathione also forms a disulfide-linked dimer called GSSG when two GSH molecules react. The balance between GSH and GSSG is widely used as an indicator of oxidative conditions, although the ratio can vary by compartment and tissue.
Glutathione supports several cellular processes beyond direct antioxidant action. It serves as a cofactor for glutathione peroxidase and glutathione S-transferase enzymes, which reduce peroxides and conjugate electrophiles, respectively. The molecule also acts as a reservoir of cysteine, an amino acid that can limit protein synthesis and redox signaling. In human nutrition, oral glutathione is sold as a supplement, but how much intact glutathione reaches tissues after ingestion remains an active research question. Clinical claims about supplementation are not uniformly supported by controlled trials.
Glutathione is a small tripeptide built from glutamic acid, cysteine, and glycine. Its peptide bond between glutamate and cysteine involves the gamma-carboxyl group rather than the usual alpha-carboxyl group. This structure gives the molecule a reactive thiol on the cysteine residue. The reduced form, often abbreviated GSH, is the predominant intracellular species in many cell types. Because the thiol can donate electrons, glutathione participates in redox chemistry and in the conjugation of reactive molecules.
=== Sexual abuse claims === Duterte has claimed he was sexually abused by a priest when he was a minor. After he was challenged by the Catholic Bishops' Conference of the Philippines (CBCP) and AdDU officials to name the priest and file a case against him, Duterte then revealed the priest's name as Mark Falvey (died 1975). The Jesuits of the Society of Jesus in the Philippines confirmed that according to press reports in the United States, in May 2007, the Society of Jesus agreed to a tentative payout of US$16 million to settle claims that Falvey sexually abused at least nine children in Los Angeles from 1959 to 1975. Accusations against Falvey began in 2002, although he was never charged with a crime. In May 2008, the Diocese of Sacramento paid a $100,000-settlement to a person allegedly raped and molested by Mark's brother, Arthur Falvey. However, it was not clearly indicated in the report if Mark Falvey was assigned at the Jesuit-run Ateneo de Davao. When asked why he did not complain when the abuse supposedly happened, Duterte claimed that he was too young to complain about the priest's abuse and was intimidated by authorities at that time. He also stated that he never disclosed the abuse even after he was expelled and moved to a different high school, not even to his family.
When initially discovered, some scientists proposed that Osedax was a whale-bone specialist, a notion later disproven by the discovery of Osedax on a variety of skeletal substrates including bone fragments, teleost bones, shark teeth, reptile and bird skeletons, pinniped bones, experimentally placed cow bones, and even human remains. Multiple species of Osedax can co-exist in close proximity, even on the same bone. Osedax and their borings enhance local biodiversity by dissolving the tough external cortical bone and tunneling through their internal layers, increasing structural complexity and providing new regions for microfauna to colonize. As such, Osedax are considered ecosystem engineers. However, these borings compromise the structural integrity of the bones, causing them to collapse after extensive boring, rendering these new habitats temporary. The role of Osedax in the degradation of marine vertebrate remains is important to marine vertebrate taphonomy.
== Treatment == When needed, treatment for anemia, such as blood transfusions are used. Stem cell transplant is another option, but the donor and the individual who will receive the bone marrow transplant must be compatible, the risks involved should be evaluated.
Acoustic metamaterials, sometimes referred to as sonic or phononic crystals, are architected materials designed to manipulate sound waves or phonons in gases, liquids, and solids. By tailoring effective parameters such as bulk modulus (β), density (ρ), and in some cases chirality, they can be engineered to transmit, trap, or attenuate waves at selected frequencies, functioning as acoustic resonators when local resonances dominate. Within the broader field of mechanical metamaterials, acoustic metamaterials represent the dynamic branch where wave control is the primary goal. Acoustic metamaterials control, direct and manipulate sound in the form of sonic, infrasonic or ultrasonic waves in gases, liquids and solids. As with electromagnetic waves, sonic waves can exhibit negative refraction. Control of sound waves is mostly accomplished through the bulk modulus β, mass density ρ and chirality. The bulk modulus and density are analogs of permittivity and permeability in electromagnetic metamaterials. Related to this is the mechanics of sound wave propagation in a lattice structure. Also materials have mass and intrinsic degrees of stiffness. Together, these form a resonant system and the mechanical (sonic) resonance may be excited by appropriate sonic frequencies (for example audible pulses). Willis materials exhibit additional nonlocal material parameters for elastic-wave manipulation—analogous to the bianisotropic moduli in electromagnetic media—that couple stress with particle velocity and linear momentum with strain, known as Willis couplings. They are named after J. R.
Thalidomide as the (R) enantiomer is effective against morning sickness, while the (S) enantiomer is teratogenic, causing birth defects when taken in the first trimester of pregnancy. If only one enantiomer is administered to a human subject, both forms may be found later in the blood serum. The drug is therefore not considered safe for use by women of child-bearing age and, while it has other uses, its use is tightly controlled. Thalidomide can be used to treat multiple myeloma. Another commonly used drug is ibuprofen which is only anti-inflammatory as one enantiomer while the other is biologically inert. Likewise, the (S) stereoisomer is much more reactive than the (R) enantiomer in citalopram (Celexa), an antidepressant which inhibits serotonin reuptake, is active. The configurational stability of a drug is therefore an area of interest in pharmaceutical research. The production and analysis of enantiomers in the pharmaceutical industry is studied in the field of chiral organic synthesis.
Sources: en.wikipedia.org
When fellow guard Bosch dissents, Barris pressures him to continue. Travis discovers that Benjy, now severely ill, concealed his need for insulin, believing he could cure his diabetes merely through dieting. Bosche tries to help find Benjy's insulin, but is caught by other guards. Barris provides Benjy's insulin, but later has all the guards beat Bosche severely and orders Travis to clean the prison toilets. When Travis taunts Barris, the guards respond by shoving his head into the toilet, nearly drowning him. One morning during roll call, Travis removes his shirt as a sign of protest, followed by the other prisoners. He climbs up to one of the cameras and demands they be released, but the guards choke him. When Benjy tries to defend Travis, Barris bludgeons him. Guards lock Travis into an old boiler pipe overnight, attack the remaining prisoners, and handcuff each man across the cell doors. While locked in the boiler, Travis discovers a hidden infrared camera. As his despondency turns to anger, he manages to escape and interrupts a guard’s attempt to rape a prisoner. The intended victim and Travis beat the guard and knock him out before freeing the other prisoners. Finding Benjy dead from his head injury, Travis leads an assault against the guards, chasing them through the building. As the remaining guards try to lift the garage door to escape, Barris tries to keep them in, unwilling to forfeit his power. A vicious brawl ensues with the prisoners overwhelming the guards.
As for plants, the country has between 40,000 and 45,000 plant species, equivalent to 10 or 20% of total global species, which is even more remarkable given that Colombia is considered a country of intermediate size. Colombia is the second most biodiverse country in the world, lagging only after Brazil which is approximately 7 times bigger. Colombia has about 2,000 species of marine fish and is the second most diverse country in freshwater fish. It is also the country with the most endemic species of butterflies, is first in orchid species, and has approximately 7,000 species of beetles. Colombia is second in the number of amphibian species and is the third most diverse country in reptiles and palms. There are about 1,900 species of mollusks and according to estimates there are about 300,000 species of invertebrates in the country. In Colombia there are 32 terrestrial biomes and 314 types of ecosystems. Protected areas and the "National Park System" cover an area of about 14,268,224 hectares (142,682.24 km2) and account for 12.77% of the Colombian territory. Compared to neighboring countries, rates of deforestation in Colombia are still relatively low. Colombia had a 2018 Forest Landscape Integrity Index mean score of 8.26/10, ranking it 25th globally out of 172 countries. Colombia is the sixth country in the world by magnitude of total renewable freshwater supply, and still has large reserves of freshwater.
=== Nodular scabies === In 5-10% of cases, alongside the burrows, rash, and possible pustules, scabies creates raised, hard, and itchy oblong nodules on the skin, 1-4cm across. They may appear purple, dark brown, or pale in patients with darker skin tones, they are pink or red on paler skin tones. These nodules are likely a result of a localized hypersensitivity of the immune system to mites, their waste, or both. Because of this, nodular scabies may be more likely in people with chronic infections, failed treatments, or people becoming re-infected, as the immune system has had time to become sensitized. These nodules are more common on scrotal skin, vulva skin, thighs, buttocks and around the underarms. As with more common presentations of scabies, it is especially present near where skin regularly touches other skin. Once the nodules develop, it can take months for them to heal, even after successful treatment. Some details about the disease are still being researched but it is known to be more common in children and may be more common in males.
=== Clinical diagnosis === Clinical presentation of the common trichinosis symptoms may also suggest infection. These symptoms include eye puffiness, splinter hemorrhage, nonspecific gastroenteritis, and muscle pain. The case definition for trichinosis at the European Center for Disease Control states, "at least three of the following six: fever, muscle soreness and pain, gastrointestinal symptoms, facial edema, eosinophilia, and subconjunctival, subungual, and retinal hemorrhages."
Sources: en.wikipedia.org
It is a tripeptide of glutamate, cysteine, and glycine. The glutamate-cysteine bond is unusual because it forms through the gamma-carboxyl group.
It reflects the balance between oxidant exposure and antioxidant capacity. The ratio is not a direct clinical diagnosis and depends on the tissue and sample method.
No. It also participates in detoxification, amino acid transport, and protein modification. Its roles vary by cell type and compartment.
Glutathione is a tripeptide of three amino acids: glutamate, cysteine, and glycine. The cysteine residue provides the sulfhydryl group that gives the molecule its reducing properties.