thiol 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 2025-08-20. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
Synthesis occurs in two ATP-dependent steps: glutamate-cysteine ligase joins glutamate and cysteine to form gamma-glutamylcysteine, and glutathione synthetase adds glycine to complete the tripeptide. The pathway is feedback-inhibited by GSH and limited by cysteine availability, so cysteine supply often constrains production. Once formed, GSH participates in redox buffering, xenobiotic conjugation, and protein glutathionylation. Glutathione peroxidase uses GSH to reduce hydrogen peroxide and lipid peroxides, yielding GSSG, while glutathione reductase regenerates GSH using NADPH. Glutathione S-transferases conjugate electrophiles to GSH, supporting detoxification and excretion.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C10H17N3O6S | Reduced form; oxidized dimer is C20H32N6O12S2 |
| Molar mass | 307.32 g/mol | For reduced glutathione (GSH) |
| Appearance | White crystalline powder | Typical laboratory and supplement-grade material |
| Solubility | Soluble in water | Poorly soluble in ethanol and other nonpolar solvents |
| Typical storage | -20 C, desiccated, protected from light | Reduced form can oxidize in solution |
== Pathogenesis == Creatine is synthesized primarily in the liver and kidneys via a two-step enzymatic process, with AGAT and GAMT enzymes. Defects in either of these two enzymes can cause a CCD. In order to pass the blood brain barrier, creatine requires a specialized transporter, encoded for by SLC6A8. A defect in this transporter is responsible for the third CCD.
radioligands) have been developed for PET that are ligands for specific neuroreceptor subtypes such as [11C]raclopride, [18F]fallypride and [18F]desmethoxyfallypride for dopamine D2/D3 receptors; [11C]McN5652 and [11C]DASB for serotonin transporters; [18F]mefway for serotonin 5HT1A receptors; and [18F]nifene for nicotinic acetylcholine receptors or enzyme substrates (e.g. 6-FDOPA for the AADC enzyme). These agents permit the visualization of neuroreceptor pools in the context of a plurality of neuropsychiatric and neurologic illnesses. PET may also be used for the diagnosis of hippocampal sclerosis, which causes epilepsy. FDG, and the less common tracers flumazenil and MPPF have been explored for this purpose. If the sclerosis is unilateral (right hippocampus or left hippocampus), FDG uptake can be compared with the healthy side. Even if the diagnosis is difficult with MRI, it may be diagnosed with PET. The development of a number of novel probes for non-invasive, in-vivo PET imaging of neuroaggregate in human brain has brought amyloid imaging close to clinical use. The earliest amyloid imaging probes included [18F]FDDNP, developed at the University of California, Los Angeles, and Pittsburgh compound B (PiB), developed at the University of Pittsburgh. These probes permit the visualization of amyloid plaques in the brains of Alzheimer's patients and could assist clinicians in making a positive clinical diagnosis of Alzheimer's disease pre-mortem and aid in the development of novel anti-amyloid therapies.
The breakdown of DNA and RNA occurs continuously within the cell. Purine and pyrimidine nucleosides can either be degraded into waste products for excretion or salvaged for reuse as nucleotide components.
Aviptadil is an injectable synthetic formulation of human vasoactive intestinal peptide (VIP). VIP was discovered in 1970, and has been used to treat various inflammatory conditions, such as acute respiratory distress syndrome (ARDS), asthma, and chronic obstructive pulmonary disease (COPD).
Sources: en.wikipedia.org
=== Reign of Doomsday === Boodikka later appears at the remains of the destroyed planet New Krypton, where she encounters Batman and Supergirl. Boodikka explains that the Guardians had sent her on a mission to survey the ruins as a follow-up to the Green Lantern Corps' initial inspection of the planet. Suddenly, the heroes are attacked by Doomsday, who strikes Boodikka before she can react. Due to her injuries, Boodikka is unable to effectively wield her ring and is nearly captured by Doomsday before being rescued by Supergirl. With Starman and Saint Walker acting as a distraction, Batman and Supergirl take Boodikka to the JLA Watchtower. Doomsday follows the two aboard. As he's about to attack them, Cyborg Superman emerges from Boodikka's body. After Doomsday captures Supergirl and Cyborg Superman and flees the Watchtower, Starman states that Boodikka is healing herself in the Justice League's medical facility and should soon have enough energy to return to Oa. In War of the Green Lanterns, Boodikka and the Alpha Lanterns are killed by Alpha Lantern Varix and buried on Oa.
== Browning of grapes during winemaking == Like most fruit, grapes vary in the number of phenolic compounds they have. This characteristic is used as a parameter in judging the quality of the wine. The general process of winemaking is initiated by the enzymatic oxidation of phenolic compounds by polyphenol oxidases. Contact between the phenolic compounds in the vacuole of the grape cell and the polyphenol oxidase enzyme (located in the cytoplasm) triggers the oxidation of the grape. Thus, the initial browning of grapes occurs as a result of "compartmentalization modification" in the cells of the grape.
By looking at Relaxation dispersion plots the data collect information on the thermodynamics and kinetics between the excited and ground. Saturation Transfer measures changes in signal from the ground state as excited states become perturbed. It uses weak radio frequency irradiation to saturate the excited state of a particular nuclei which transfers its saturation to the ground state. This signal is amplified by decreasing the magnetization (and the signal) of the ground state. The main limitations in NMR is that its resolution decreases with proteins that are larger than 25 kDa and is not as detailed as X-ray crystallography. Additionally, protein NMR analysis is quite difficult and can propose multiple solutions from the same NMR spectrum. In a study focused on the folding of an amyotrophic lateral sclerosis involved protein SOD1, excited intermediates were studied with relaxation dispersion and Saturation transfer. SOD1 had been previously tied to many disease causing mutants which were assumed to be involved in protein aggregation, however the mechanism was still unknown. By using Relaxation Dispersion and Saturation Transfer experiments many excited intermediate states were uncovered misfolding in the SOD1 mutants.
The company is working with food supplier Warabeya Nichiyo, which already supplies 7-Eleven's commissary food offerings in Japan, to create a US supply chain that will bring higher-quality Western and Japanese food offerings to 7-Eleven stores. Isaka also announced 7-Eleven's plan to grow its footprint and consolidate a larger portion of the US convenience store market. The company announced plans to add hot and cold food options and a larger baked goods selection at up to 1,600 Speedway and Stripes stores. Fuel In the U.S., many 7-Eleven filling stations had gasoline distributed by Citgo, which in 1983 were purchased by Southland Corporation. 50% of Citgo was sold in 1986 to Petróleos de Venezuela, S.A., and the remaining 50% was acquired in 1990. Although Citgo was the predominant partner of 7-Eleven, other oil companies are also co-branded with 7-Eleven, including Fina, Exxon, Mobil, Gulf, Marathon, BP, Amoco, Phillips 66, Conoco, 76, Shell, Chevron (some former TETCO convenience stores were co-branded with Chevron, and Texaco prior to the 7-Eleven purchase in late 2012), Sunoco, and Sinclair. Conoco is the largest 7-Eleven licensee in North America. The Pittsburgh market alone—where 7-Eleven is the market leader by store count but third behind Sheetz and GetGo in revenue— offers fuel from Exxon, Gulf, Marathon (both legacy 7-Eleven locations and Speedway), BP, and Sunoco (the latter two being from 7-Eleven's acquisitions of their company-owned-and-operated locations in the area) and also having previously offered Citgo and Pennzoil at some locations.
== ISO 8000 – ISO 8999 == ISO 8000 Data quality ISO 8002:1986 Mechanical vibrations – Land vehicles – Method for reporting measured data ISO 8015:2011 Geometrical product specifications (GPS) – Fundamentals – Concepts, principles and rules ISO 8041:2005 Human response to vibration - Measuring instrumentation ISO 8041-1:2017 Part 1: General purpose vibration meters ISO 8042:1988 Shock and vibration measurements – Characteristics to be specified for seismic pick-ups ISO 8044:2015 Corrosion of metals and alloys – Basic terms and definitions ISO 8048:1984 Technical drawings – Construction drawings – Representation of views, sections and cuts ISO 8049:2016 Ferronickel shot - Sampling for analysis ISO 8050:1988 Ferronickel ingots or pieces - Sampling for analysis ISO 8062 Geometrical product specifications (GPS) - Dimensional and geometrical tolerances for moulded parts ISO 8062-1:2007 Part 1: Vocabulary ISO/TS 8062-2:2013 Part 2: Rules ISO 8062-3:2007 Part 3: General dimensional and geometrical tolerances and machining allowances for castings ISO 8062-4:2017 Part 4: General tolerances for castings using profile tolerancing in a general datum system ISO 8063 Information processing – Data interchange on 6,30 mm (0.25 in) wide magnetic tape cartridge using IMFM recording at 252 ftpmm (6 400 ftpi) ISO 8063-1:1986 Part 1: Mechanical, physical and magnetic properties ISO 8063-2:1986 Part 2: Track format and method of recording for data interchange in start/stop mode ISO 8064:1985 Information processing – Reels for 12,7 mm (0,5 in) wide magnetic tapes – Sizes 16, 18 and 22 ISO/IEC 8072:1996 Information technology – Open systems interconnection – Transport service definition ISO/IEC 8073:1997 Information technology – Open Systems Interconnection – Protocol for providing the connection-mode transport service ISO 8088:1994 Equipment for olive cultivation and olive oil production – Vocabulary ISO 8090:1990 Cycles – Terminology ISO 8107:1993 Nuclear power plants - Maintainability - Terminology ISO 8109:1990 Banking and related financial services – Securities – Format of Eurobonds ISO 8114:1990 Textile machinery and accessories – Spindles for ring-spinning and doubling machines – List of equivalent terms ISO 8116 Textile machinery and accessories – Beams for winding ISO 8116-1:1995 Part 1: General vocabulary ISO 8119 Textile machinery and accessories – Needles for knitting machines – Terminology ISO 8119-1:1989 Part 1: Latch-type needles ISO 8119-2:1989 Part 2: Bearded needles ISO 8119-3:1992 Part 3: Compound needles ISO/IEC 81346: Industrial systems, installations and equipment and industrial products – structuring principles and reference designations ISO 8147:1995 Shipbuilding and marine structures – Derrick rigs and component parts – Vocabulary ISO 8152:1984 Earth-moving machinery – Operation and maintenance – Training of mechanics ISO 8153 Aerospace fluid systems and components – Vocabulary ISO 8153-1:2009 Part 1: Hose assemblies ISO 8157:2015 Fertilizers and soil conditioners – Vocabulary ISO 8159:1987 Textiles – Morphology of fibres and yarns – Vocabulary ISO 8160:1987 Textiles – Textured filament yarns – Vocabulary ISO 8178 Reciprocating internal combustion engines - Exhaust emission measurement ISO 8180 Ductile iron pipelines – Polyethylene sleeving for site application ISO 8199:2005 Water quality – General guidance on the enumeration of micro-organisms by culture ISO/IEC 8208:2000 Information technology – Data communications – X.25 Packet Layer Protocol for Data Terminal Equipment ISO/IEC 8211:1994 Information technology - Specification for a data descriptive file for information interchange ISO 8217:2017 Petroleum products - Fuels (class F) - Specifications of marine fuels ISO 8229:1991 Operations and baths relating to dry-cleaning machines – Vocabulary ISO 8277:2013 Ships and marine technology – Pipework and machinery – Information transfer ISO 8297:1994 Acoustics – Determination of sound power levels of multisource industrial plants for evaluation of sound pressure levels in the environment – Engineering method ISO 8316:1987 Measurement of liquid flow in closed conduits – Method by collection of the liquid in a volumetric tank ISO 8317:2015 Child-resistant packaging - Requirements and testing procedures for reclosable packages ISO 8319 Orthopaedic instruments – Drive connections ISO 8319-1:1996 Part 1: Keys for use with screws with hexagon socket heads ISO 8319-2:1986 Part 2: Screwdrivers for single slot head screws, screws with cruciate slot and cross-recessed head screws ISO/IEC 8326:1996 Information technology – Open Systems Interconnection – Session service definition ISO/IEC 8327 Information technology – Open Systems Interconnection – Connection-oriented Session protocol ISO/IEC 8327-1:1996 Protocol specification ISO/IEC 8327-2:1996 Protocol Implementation Conformance Statement (PICS) proforma ISO 8330:2014 Rubber and plastics hoses and hose assemblies - Vocabulary ISO 8333:1985 Liquid flow measurement in open channels by weirs and flumes – V-shaped broad-crested weirs ISO 8343:1985 Ferronickel - Determination of silicon content - Gravimetric method ISO/IEC 8348:2002 Information technology – Open Systems Interconnection – Network service definition ISO 8362 Injection containers and accessories ISO 8362-1:2009 Part 1: Injection vials made of glass tubing ISO 8362-2:2015 Part 2: Closures for injection vials ISO 8362-3:2001 Part 3: Aluminium caps for injection vials ISO 8362-4:2011 Part 4: Injection vials made of moulded glass ISO 8362-5:2016 Part 5: Freeze drying closures for injection vials ISO 8362-6:2010 Part 6: Caps made of aluminium-plastics combinations for injection vials ISO 8362-7:2006 Part 7: Injection caps made of aluminium-plastics combinations without overlapping plastics part ISO/TR 8363:1997 Measurement of liquid flow in open channels — General guidelines for selection of method [Withdrawn: replaced by ISO 18365] ISO 8368:1999 Hydrometric determinations – Flow measurements in open channels using structures – Guidelines for selection of structure ISO 8373:2012 Manipulating industrial robots – Vocabulary ISO 8378 Information processing – Data interchange on 130 mm (5.25 in) flexible disk cartridges using modified frequency modulation recording at 7 958 ftprad, 3,8 tpmm (96 tpi), on both sides ISO 8378-1:1986 Part 1: Dimensional, physical and magnetic characteristics ISO 8378-2:1986 Part 2: Track format A ISO 8378-3:1986 Part 3: Track format B ISO 8384:2000 Ships and marine technology – Dredgers – Vocabulary ISO 8388:1998 Knitted fabrics – Types – Vocabulary ISO 8421 Fire protection - Vocabulary ISO 8421-1:1987 Part 1: General terms and phenomena of fire ISO 8421-2:1987 Part 2: Structural fire protection ISO 8421-6:1987 Part 6: Evacuation and means of escape ISO 8421-7:1987 Part 7: Explosion detection and suppression means ISO 8422:2006 Sequential sampling plans for inspection by attributes ISO 8423:2008 Sequential sampling plans for inspection by variables for percent nonconforming (known standard deviation) ISO 8429:1986 Optics and optical instruments – Ophthalmology – Graduated dial scale ISO 8439:1990 Forms design - Basic layout ISO 8440:1986 Location of codes in trade documents ISO/IEC 8441 Information technology – High density digital recording (HDDR) ISO/IEC 8441-1:1991 Part 1: Unrecorded magnetic tape for (HDDR) applications ISO/IEC 8441-2:1991 Part 2: Guide for interchange practice ISO 8459:2009 Information and documentation - Bibliographic data element directory for use in data exchange and enquiry ISO 8462 Information processing – Data interchange on 6,30 mm (0.25 in) magnetic tape cartridge using GCR recording at 394 ftpmm (10 000 ftpi), 39 cpmm (1 000 cpi) ISO 8462-1:1986 Part 1: Mechanical, physical and magnetic properties ISO 8462-2:1986 Part 2: Streaming mode ISO/IEC 8473 Information technology – Protocol for providing the connectionless-mode network service ISO/IEC 8473-1:1998 Protocol specification ISO/IEC 8473-2:1996 Part 2: Provision of the underlying service by an ISO/IEC 8802 subnetwork ISO/IEC 8473-3:1995 Provision of the underlying service by an X.25 subnetwork ISO/IEC 8473-4:1995 Provision of the underlying service by a subnetwork that provides the OSI data link service ISO/IEC 8473-5:1997 Provision of the underlying service by ISDN circuit-switched B-channels ISO/IEC 8480:1995 Information technology – Telecommunications and information exchange between systems – DTE/DCE interface back-up control operation using ITU-T Recommendation V.24 interchange circuits ISO/IEC 8481:1996 Information technology – Telecommunications and information exchange between systems – DTE to DTE direct connections ISO/IEC 8482:1993 Information technology – Telecommunications and information exchange between systems – Twisted pair multipoint interconnections ISO/IEC 8484:2014 Information technology – Magnetic stripes on savingsbooks ISO 8485:1989 Programming languages - APL ISO 8498:1990 Woven fabrics – Description of defects – Vocabulary ISO 8499:2003 Knitted fabrics – Description of defects – Vocabulary ISO 8501 Preparation of steel substrates before application of paints and related products – Visual assessment of surface cleanliness ISO 8501-1:2007 Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings ISO 8501-2:1994 Part 2: Preparation grades of previously coated steel substrates after localized removal of previous coatings ISO 8501-3:2006 Part 3: Preparation grades of welds, edges and other areas with surface imperfections ISO 8501-4:2006 Part 4: Initial surface conditions, preparation grades and flash rust grades in connection with high-pressure water jetting ISO 8502 Preparation of steel substrates before application of paints and related products - Tests for the assessment of surface cleanliness ISO 8502-2:2017 Part 2: Laboratory determination of chloride on cleaned surfaces ISO 8502-3:2017 Part 3: Assessment of dust on steel surfaces prepared for painting (pressure-sensitive tape method) ISO 8502-4:2017 Part 4: Guidance on the estimation of the probability of condensation prior to paint application ISO 8502-5:1998 Part 5: Measurement of chloride on steel surfaces prepared for painting (ion detection tube method ISO 8502-6:2006 Part 6: Extraction of soluble contaminants for analysis - The Bresle method ISO 8502-9:1998 Part 9: Field method for the conductometric determination of water-soluble salts ISO 8502-11:2006 Part 11: Field method for the turbidimetric determination of water-soluble sulfate ISO 8503 Preparation of steel substrates before application of paints and related products - Surface roughness characteristics of blast-cleaned steel substrates ISO 8503-1:2012 Part 1: Specifications and definitions for ISO surface profile comparators for the assessment of abrasive blast-cleaned surfaces ISO 8503-2:2012 Part 2: Method for the grading of surface profile of abrasive blast-cleaned steel - Comparator procedure ISO 8503-3:2012 Part 3: Method for the calibration of ISO surface profile comparators and for the determination of surface profile - Focusing microscope procedure ISO 8503-4:2012 Part 4: Method for the calibration of ISO surface profile comparators and for the determination of surface profile - Stylus instrument procedure ISO 8503-5:2017 Part 5: Replica tape method for the determination of the surface profile ISO 8504 Preparation of steel substrates before application of paints and related products - Surface preparation methods ISO 8504-1:2000 Part 1: General principles ISO 8504-2:2000 Part 2: Abrasive blast-cleaning ISO 8504-3:1993 Part 3: Hand- and power-tool cleaning ISO 8506:2024 Information technology — Automatic identification and data capture technology — AIDC application in industrial construction ISO 8512 Surface plates ISO 8512-1:1990 Part 1: Cast iron ISO 8512-2:1990 Part 2: Granite ISO/TR 8517:1988 Rubber- or plastics-covered rollers – Glossary ISO 8525:2008 Airborne noise emitted by machine tools – Operating conditions for metal-cutting machines ISO 8528 Reciprocating internal combustion engine driven alternating current generating sets ISO 8528-1:2005 Part 1: Application, ratings and performance ISO 8528-2:2005 Part 2: Engines ISO 8528-3:2005 Part 3: Alternating current generators for generating sets ISO 8528-4:2005 Part 4: Controlgear and switchgear ISO 8528-5:2013 Part 5: Generating sets ISO 8528-6:2005 Part 6: Test methods ISO 8528-7:2017 Part 7: Technical declarations for specification and design ISO 8528-8:2016 Part 8: Requirements and tests for low-power generating sets ISO 8528-9:2017 Part 9: Measurement and evaluation of mechanical vibrations ISO 8528-10:1998 Part 10: Measurement of airborne noise by the enveloping surface method ISO 8528-12:1997 Part 12: Emergency power supply to safety services ISO 8528-13:2016 Part 13: Safety ISO 8529 Reference neutron radiations ISO 8529-1:2001 Part 1: Characteristics and methods of production ISO 8529-2:2000 Part 2: Calibration fundamentals of radiation protection devices related to the basic quantities characterizing the radiation field ISO 8529-3:1998 Part 3: Calibration of area and personal dosimeters and determination of response as a function of energy and angle of incidence ISO 8532:1995 Securities – Format for transmission of certificate numbers ISO 8536 Infusion equipment for medical use ISO 8536-1:2011 Part 1: Infusion glass bottles ISO 8536-2:2010 Part 2: Closures for infusion bottles ISO 8536-3:2009 Part 3: Aluminium caps for infusion bottles ISO 8536-4:2010 Part 4: Infusion sets for single use, gravity feed ISO 8536-5:2004 Part 5: Burette infusion sets for single use, gravity feed ISO 8536-6:2016 Part 6: Freeze drying closures for infusion bottles ISO 8536-7:2009 Part 7: Caps made of aluminium-plastics combinations for infusion bottles ISO 8536-8:2015 Part 8: Infusion sets for single use with pressure infusion apparatus ISO 8536-9:2015 Part 9: Fluid lines for single use with pressure infusion equipment ISO 8536-10:2015 Part 10: Accessories for fluid lines for single use with pressure infusion equipment ISO 8536-11:2015 Part 11: Infusion filters for single use with pressure infusion equipment ISO 8536-12:2007 Part 12: Check valves ISO 8536-13:2016 Part 13: Graduated flow regulators for single use with fluid contact ISO 8536-14:2016 Part 14: Clamps and flow regulators for transfusion and infusion equipment without fluid contact ISO 8537:2016 Sterile single-use syringes, with or without needle, for insulin ISO 8540:1993 Open front mechanical power presses - Vocabulary ISO 8548 Prosthetics and orthotics – Limb deficiencies ISO 8548-1:1989 Part 1: Method of describing limb deficiencies present at birth ISO 8548-2:1993 Part 2: Method of describing lower limb amputation stumps ISO 8548-3:1993 Part 3: Method of describing upper limb amputation stumps ISO 8548-4:1998 Part 4: Description of causal conditions leading to amputation ISO 8548-5:2003 Part 5: Description of the clinical condition of the person who has had an amputation ISO 8549 Prosthetics and orthotics - Vocabulary ISO 8549-1:1989 Part 1: General terms for external limb prostheses and external orthoses ISO 8549-2:1989 Part 2: Terms relating to external limb prostheses and wearers of these prostheses ISO 8549-3:1989 Part 3: Terms relating to external orthoses ISO 8549-4:2014 Part 4: Terms relating to limb amputation ISO/TR 8550 Guidance on the selection and usage of acceptance sampling systems for inspection of discrete items in lots ISO/TR 8550-1:2007 Part 1: Acceptance sampling ISO/TR 8550-2:2007 Part 2: Sampling by attributes ISO/TR 8550-3:2007 Part 3: Sampling by variables ISO 8551:2003 Prosthetics and orthotics – Functional deficiencies – Description of the person to be treated with an orthosis, clinical objectives of treatment, and functional requirements of the orthosis ISO 8552:2004 Milk – Estimation of psychrotrophic microorganisms – Colony-count technique at 21 degrees C (Rapid method) ISO 8553:2004 Milk – Enumeration of microorganisms – Plate-loop technique at 30 degrees C ISO 8559:1989 Garment construction and anthropometric surveys – Body dimensions [Withdrawn: replaced by ISO 8559-1:2017] ISO 8559 Size designation of clothes ISO 8559-1:2017 Part 1: Anthropometric definitions for body measurement ISO 8559-2:2017 Part 2: Primary and secondary dimension indicators ISO 8560:1986 Technical drawings – Construction drawings – Representation of modular sizes, lines and grids ISO 8568:2007 Mechanical shock – Testing machines – Characteristics and performance ISO 8571 Information processing systems - Open Systems Interconnection - File Transfer, Access and Management ISO 8571-1:1988 Part 1: General introduction ISO 8571-2:1988 Part 2: Virtual Filestore Definition ISO 8571-3:1988 Part 3: File Service Definition ISO 8571-4:1988 Part 4: File Protocol Specification ISO/IEC 8571-5:1990 Part 5: Protocol Implementation Conformance Statement Proforma ISO 8573 Compressed air ISO 8573-1:2010 Contaminants and purity classes ISO 8573-2:2007 Test methods for oil aerosol content ISO 8573-3:1999 Test methods for measurement of humidity ISO 8573-4:2001 Test methods for solid particle content ISO 8573-5:2001 Test methods for oil vapour and organic solvent content ISO 8573-6:2003 Test methods for gaseous contaminant content ISO 8573-7:2003 Test method for viable microbiological contaminant content ISO 8573-8:2004 Test methods for solid particle content by mass concentration ISO 8573-9:2004 Test methods for liquid water content ISO 8579 Acceptance code for gear units ISO 8579-1:2002 Part 1: Test code for airborne sound ISO 8583 Financial transaction card originated messages – Interchange message specifications ISO 8586:2012 Sensory analysis – General guidelines for the selection, training and monitoring of selected assessors and expert sensory assessors ISO 8596:2009 Ophthalmic optics – Visual acuity testing – Standard optotype and its presentation ISO 8598 Optics and optical instruments – Focimeters ISO 8598-1:2014 Part 1: General purpose instruments ISO 8600 Endoscopes – Medical endoscopes and endotherapy devices ISO 8600-1:2015 Part 1: General requirements ISO 8600-2:2015 Part 2: Particular requirements for rigid bronchoscopes ISO 8600-3:1997 Part 3: Determination of field of view and direction of view of endoscopes with optics ISO 8600-4:2014 Part 4: Determination of maximum width of insertion portion ISO 8600-5:2005 Part 5: Determination of optical resolution of rigid endoscopes with optics ISO 8600-6:2005 Part 6: Vocabulary ISO 8600-7:2012 Part 7: Basic requirements for medical endoscopes of water-resistant type ISO 8601:2019 Data elements and interchange formats – Information interchange – Representation of dates and times ISO/IEC 8602:1995 Information technology – Protocol for providing the OSI connectionless-mode transport service ISO 8604:1988 Plastics – Prepregs – Definitions of terms and symbols for designations ISO 8608:2016 Mechanical vibration – Road surface profiles – Reporting of measured data ISO 8612:2009 Ophthalmic instruments – Tonometers ISO/IEC 8613 Information technology – Open Document Architecture (ODA) and interchange format ISO 8614:1997 Ski bindings – Vocabulary ISO 8615:1991 Implants for surgery – Fixation devices for use in the ends of the femur in adults ISO 8624:2011 Ophthalmic optics – Spectacle frames – Measuring system and terminology ISO 8625 Aerospace – Fluid systems – Vocabulary ISO 8625-1:1993 Part 1: General terms and definitions related to pressure ISO 8625-2:1991 Part 2: General terms and definitions relating to flow ISO 8625-3:1991 Part 3: General terms and definitions relating to temperature ISO 8625-4:2011 Part 4: General terms and definitions relating to control/actuation systems ISO 8626:1989 Servo-hydraulic test equipment for generating vibration – Method of describing characteristics ISO 8630 Information processing – Data interchange on 130 mm (5.25 in) flexible disk cartridges using modified frequency modulation recording at 13 262 ftprad, on 80 tracks on each side ISO 8630-1:1987 Part 1: Dimensional, physical and magnetic characteristics ISO 8630-2:1987 Part 2: Track format A for 77 tracks ISO 8630-3:1987 Part 3: Track format B for 80 tracks ISO/IEC 8631:1989 Information technology - Program constructs and conventions for their representation ISO/IEC 8632 Information technology – Computer graphics – Metafile for the storage and transfer of picture description information ISO/IEC 8632-1:1999 Part 1: Functional specification ISO/IEC 8632-2:1992 Part 2: Character encoding [withdrawn 2001-06-21] ISO/IEC 8632-3:1999 Part 3: Binary encoding ISO/IEC 8632-4:1999 Part 4: Clear text encoding ISO 8637:2010 Cardiovascular implants and extracorporeal systems – Haemodialysers, haemodiafilters, haemofilters and haemoconcentrators ISO 8638:2010 Cardiovascular implants and extracorporeal systems – Extracorporeal blood circuit for haemodialysers, haemodiafilters and haemofilters ISO 8640 Textile machinery and accessories – Flat warp knitting machines ISO 8640-1:2004 Part 1: Vocabulary of basic structure and knitting elements ISO 8640-2:2004 Part 2: Vocabulary of warp let-off, fabric take-up and batching ISO 8640-3:2002 Part 3: Vocabulary of patterning devices ISO 8640-4:1996 Part 4: Stitch bonding machines and stitch bonding devices ISO 8648:1988 Information processing systems – Open Systems Interconnection – Internal organization of the Network Layer ISO/IEC 8650 Information technology – Open Systems Interconnection – Protocol specification for the Association Control Service Element ISO/IEC 8650-2:1997 Protocol Implementation Conformance Statement (PICS) proforma ISO 8651 Information technology – Computer graphics – Graphical Kernel System (GKS) language bindings ISO 8651-1:1988 Part 1: FORTRAN ISO 8651-2:1988 Part 2: Pascal ISO 8651-3:1988 Part 3: Ada ISO/IEC 8651-4:1995 Part 4: C ISO/IEC 8652:2012 Information technology – Programming languages – Ada ISO 8653:1986 Jewellery – Ring-sizes – Definition, measurement and designation ISO 8655 Piston-operated volumetric apparatus ISO 8655-1:2002 Part 1: Terminology, general requirements and user recommendations ISO 8655-2:2002 Part 2: Piston pipettes ISO 8655-3:2002 Part 3: Piston burettes ISO 8655-4:2002 Part 4: Dilutors ISO 8655-5:2002 Part 5: Dispensers ISO 8655-6:2002 Part 6: Gravimetric methods for the determination of measurement error ISO 8655-7:2005 Part 7: Non-gravimetric methods for the assessment of equipment performance ISO 8669 Urine collection bags ISO 8669-1:1988 Part 1: Vocabulary ISO 8670 Ostomy collection bags ISO 8670-1:1988 Part 1: Vocabulary ISO 8691 Petroleum products – Low levels of vanadium in liquid fuels – Determination by flameless atomic absorption spectrometry after ashing ISO 8695:2010 Tools for pressing - Punches - Nomenclature and terminology ISO/TR 8713:2012 Electrically propelled road vehicles – Vocabulary ISO 8769:2016 Reference sources - Calibration of surface contamination monitors - Alpha-, beta- and photon emitters ISO 8777:1993 Information and documentation - Commands for interactive text searching ISO 8784 Pulp, paper and board – Microbiological examination ISO 8784-1:2014 Part 1: Enumeration of bacteria and bacterial spores based on disintegration ISO 8785:1998 Geometrical Product Specification (GPS) - Surface imperfections - Terms, definitions and parameters ISO 8790:1987 Information processing systems - Computer system configuration diagram symbols and conventions ISO/IEC 8802 Information technology – Telecommunications and information exchange between systems – Local and metropolitan area networks – Specific requirements ISO/IEC/IEEE 8802-A:2015 Part A: Overview and architecture ISO/IEC TR 8802-1:2001 Part 1: Overview of Local Area Network Standards ISO/IEC/IEEE 8802-1Q:2016 Part 1Q: Bridges and bridged networks ISO/IEC/IEEE 8802-1X:2013 Part 1X: Port-based network access control ISO/IEC/IEEE 8802-1AB:2017 Part 1AB: Station and media access control connectivity discovery ISO/IEC/IEEE 8802-1AE:2013 Part 1AE: Media access control (MAC) security ISO/IEC/IEEE 8802-1AR:2014 Part 1AR: Secure device identity ISO/IEC/IEEE 8802-1AS:2014 Part 1AS: Timing and synchronization for time-sensitive applications in bridged local area networks ISO/IEC/IEEE 8802-1AX:2016 Part 1AX: Link aggregation ISO/IEC/IEEE 8802-1BA:2016 Part 1BA: Audio video bridging (AVB) systems ISO/IEC/IEEE 8802-1BR:2016 Part 1BR: Virtual bridged local area networks – Bridge port extension ISO/IEC 8802-2:1998 Part 2: Logical link control ISO/IEC/IEEE 8802-3:2017 Part 3: Standard for Ethernet ISO/IEC/IEEE 8802-3-1:2015 Part 3-1: Standard for management information base (MIB) – Definitions for Ethernet ISO/IEC 8802-5:1998 Part 5: Token Ring access method and physical layer specifications ISO/IEC/IEEE 8802-11:2012 Part 11: Wireless LAN medium access control (MAC) and physical layer (PHY) specifications ISO/IEC/IEEE 8802-15-4:2010 Part 15-4: Wireless medium access control (MAC) and physical layer (PHY) specifications for low-rate wireless personal area networks (WPANs) ISO/IEC/IEEE 8802-22:2015 Part 22: Cognitive Wireless RAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications: Policies and Procedures for Operation in the TV Bands ISO 8805 Information processing systems – Computer graphics – Graphical Kernel System for Three Dimensions (GKS-3D) functional description ISO/IEC 8806 Information technology – Computer graphics – Graphical Kernel System for Three Dimensions (GKS-3D) language bindings ISO/IEC 8806-4 Part 4: C ISO 8807:1989 Information processing systems – Open Systems Interconnection – LOTOS – A formal description technique based on the temporal ordering of observational behaviour ISO 8811:2000 Earth-moving machinery – Rollers and compactors – Terminology and commercial specifications ISO 8812:2016 Earth-moving machinery – Backhoe loaders – Terminology and commercial specifications ISO 8815:1994 Aircraft – Electrical cables and cable harnesses – Vocabulary ISO/IEC 8822:1994 Information technology – Open Systems Interconnection – Presentation service definition ISO/IEC 8823 Information technology – Open Systems Interconnection – Connection-oriented presentation protocol ISO/IEC 8823-1:1994 Protocol specification ISO/IEC 8823-2:1997 Protocol Implementation Conformance Statement (PICS) proforma ISO/IEC 8824 Information technology – Abstract Syntax Notation One (ASN.1) ISO/IEC 8824-1:2015 Specification of basic notation ISO/IEC 8824-2:2015 Information object specification ISO/IEC 8824-3:2015 Constraint specification ISO/IEC 8824-4:2015 Parameterization of ASN.1 specifications ISO/IEC 8825 Information technology – ASN.1 encoding rules ISO/IEC 8825-1:2015 Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER) ISO/IEC 8825-2:2015 Specification of Packed Encoding Rules (PER) ISO/IEC 8825-3:2015 Specification of Encoding Control Notation (ECN) ISO/IEC 8825-4:2015 XML Encoding Rules (XER) ISO/IEC 8825-5:2015 Mapping W3C XML schema definitions into ASN.1 ISO/IEC 8825-6:2015 Registration and application of PER encoding instructions ISO/IEC 8825-7:2015 Part 7: Specification of Octet Encoding Rules (OER) ISO 8826 Technical drawings – Rolling bearings ISO 8826-1:1989 Part 1: General simplified representation ISO 8826-2:1994 Part 2: Detailed simplified representation ISO 8827:1988 Implants for surgery – Staples with parallel legs for orthopaedic use – General requirements ISO 8828:2014 Implants for surgery – Guidance on care and handling of orthopaedic implants ISO 8835 Inhalational anaesthesia systems ISO 8835-7:2011 Part 7: Anaesthetic systems for use in areas with limited logistical supplies of electricity and anaesthetic gases ISO 8836:2014 Suction catheters for use in the respiratory tract ISO 8843:2005 Aircraft – Crimp-removable contacts for electrical connectors – Identification system ISO 8855:2011 Road vehicles – Vehicle dynamics and road-holding ability – Vocabulary ISO/IEC 8859 Information technology – 8-bit single-byte coded graphic character sets ISO/IEC 8859-1:1998 Part 1: Latin alphabet No. 1 ISO/IEC 8859-2:1999 Part 2: Latin alphabet No. 2 ISO/IEC 8859-3:1999 Part 3: Latin alphabet No. 3 ISO/IEC 8859-4:1998 Part 4: Latin alphabet No. 4 ISO/IEC 8859-5:1999 Part 5: Latin/Cyrillic alphabet ISO/IEC 8859-6:1999 Part 6: Latin/Arabic alphabet ISO/IEC 8859-7:2003 Part 7: Latin/Greek alphabet ISO/IEC 8859-8:1999 Part 8: Latin/Hebrew alphabet ISO/IEC 8859-9:1999 Part 9: Latin alphabet No. 5 ISO/IEC 8859-10:1998 Part 10: Latin alphabet No. 6 ISO/IEC 8859-11:2001 Part 11: Latin/Thai alphabet ISO/IEC 8859-13:1998 Part 13: Latin alphabet No. 7 ISO/IEC 8859-14:1998 Part 14: Latin alphabet No. 8 (Celtic) ISO/IEC 8859-15:1999 Part 15: Latin alphabet No. 9 ISO/IEC 8859-16:2001 Part 16: Latin alphabet No. 10 ISO 8860 Information processing – Data interchange on 90 mm (3.5 in) flexible disk cartridges using modified frequency modulation recording at 7 958 ftprad on 80 tracks on each side ISO 8860-1:1987 Part 1: Dimensional, physical and magnetic characteristics ISO 8860-2:1987 Part 2: Track format ISO 8871 Elastomeric parts for parenterals and for devices for pharmaceutical use ISO 8871-1:2003 Part 1: Extractables in aqueous autoclavates ISO 8871-2:2003 Part 2: Identification and characterization ISO 8871-3:2003 Part 3: Determination of released-particle count ISO 8871-4:2006 Part 4: Biological requirements and test methods ISO 8871-5:2016 Part 5: Functional requirements and testing ISO 8872:2003 Aluminium caps for transfusion, infusion and injection bottles – General requirements and test methods ISO/IEC 8877:1992 Information technology – Telecommunications and information exchange between systems – Interface connector and contact assignments for ISDN Basic Access Interface located at reference points S and T ISO/IEC 8878:1992 Information technology – Telecommunications and information exchange between systems – Use of X.25 to provide the OSI Connection-mode Network Service ISO 8879:1986 Information processing – Text and office systems – Standard Generalized Markup Language (SGML) ISO/IEC 8880 Information technology — Telecommunications and information exchange between systems — Protocol combinations to provide and support the OSI Network Service ISO/IEC 8880-1:1990 Part 1: General principles [Withdrawn: replaced by ISO/IEC TR 13532:1995, now withdrawn without replacement] ISO/IEC 8880-2:1992 Part 2: Provision and support of the connection-mode Network Service [Withdrawn: replaced by ISO/IEC TR 13532:1995, now withdrawn without replacement] ISO/IEC 8880-3:1990 Part 3: Provision and support of the connectionless-mode Network Service [Withdrawn: replaced by ISO/IEC TR 13532:1995, now withdrawn without replacement] ISO/IEC 8881:1989 Information processing systems – Data communications – Use of the X.25 packet level protocol in local area networks ISO/IEC 8882 Information technology – Telecommunications and information exchange between systems – X.25 DTE conformance testing ISO/IEC 8882-1:1996 Part 1: General principles ISO/IEC 8882-2:2000 Part 2: Data link layer conformance test suite ISO/IEC 8882-3:2000 Part 3: Packet layer conformance test suite ISO 8884:1989 Information processing — Text and office systems — Keyboards for multiple Latin-alphabet languages — Layout and operation [Withdrawn: replaced with ISO 9995-(1,7)] ISO 8885:1987 Information processing systems — Data communication — High-level data link control procedures — General purpose XID frame information field content and format [Withdrawn without replacement] ISO/IEC 8886:1996 Information technology – Open Systems Interconnection – Data link service definition ISO 8887 Technical product documentation – Design for manufacturing, assembling, disassembling and end-of-life processing ISO 8887-1:2017 Part 1: General concepts and requirements ISO 8891:1998 Dental casting alloys with noble metal content of at least 25 % but less than 75 % [Withdrawn: replaced with ISO 22674] ISO 8909 Forage harvesters ISO 8909-1:1994 Part 1: Vocabulary ISO 8910:1993 Machinery and equipment for working the soil – Mouldboard plough working elements – Vocabulary ISO 8927:1991 Earth-moving machinery – Machine availability – Vocabulary ISO 8930:1987 General principles on reliability for structures – List of equivalent terms ISO 8936:2017 Awnings for leisure accommodation vehicles - Requirements and test methods ISO 8954 Ferroalloys - Vocabulary ISO 8954-1:1990 Part 1: Materials ISO 8954-2:1990 Part 2: Sampling and sample preparation ISO 8954-3:1990 Part 3: Sieve analysis ISO 8957:1996 Information and documentation - Hebrew alphabet coded character sets for bibliographic information interchange ISO 8965:2013 Logging industry – Technology – Terms and definitions ISO 8979:2004 Pliers and nippers for electronics - Nomenclature ISO 8980 Ophthalmic optics – Uncut finished spectacle lenses ISO 8980-1:2017 Part 1: Specifications for single-vision and multifocal lenses ISO 8980-2:2017 Part 2: Specifications for power-variation lenses ISO 8980-3:2013 Part 3: Transmittance specifications and test methods ISO 8980-4:2006 Part 4: Specifications and test methods for anti-reflective coatings ISO 8980-5:2005 Part 5: Minimum requirements for spectacle lens surfaces claimed to be abrasion-resistant ISO 8999:2001 Reciprocating internal combustion engines - Graphical symbols
Sources: en.wikipedia.org
Molecular: HCHO + hν → H2 + CO (λ < 360 nm) Radical: HCHO + hν → H + HCO (λ < 330 nm) The H and HCO radicals react with the atmospheric O2 to form hydroperoxyl (HO2) radicals, giving a net radical channel of:
Therefore, EHTs are suitable to model the disease phenotype and recapitulate functional alterations found in mice with hypertrophic cardiomyopathy. Another good system for modeling cardiomyopathies in the cell culture dish is the derivation of cardiac myocytes from iPSC. Reports of human iPSC models of sarcomeric cardiomyopathies showed cellular hypertrophy in most of the cases, including one with the c.2995_3010del MYBPC3 mutation that exhibited in addition to hypertrophy contractile variability in the presence of endothelin-1.
A 2020 review found most men believed the average erect penis length is more than 15.24 cm (6 inches). This inaccurate belief has likely been fed by inaccurate and exaggerated data presented in studies where the size of a participant's erect penis is self-reported. Participants may report overestimates of the size of their penis in the belief that a larger penis is more socially desirable. The same review analyzed the results from ten prior studies where measurements of erect penis size were made by researchers. They reported an erect penis to be between 12.95 and 13.92 cm (5.1 and 5.5 inches, respectively) in length, a result significantly below the average obtained in self-reported studies. The authors commented that results of such measurement studies may still be inflated due to volunteer bias — the possibility that men with larger penises may be more likely to choose to participate in such studies.
Portland cement, the most common type of cement in general use around the world as a basic ingredient of concrete, mortar, stucco, and non-speciality grout, was developed in England in the mid 19th century, and usually originates from limestone. James Frost produced what he called "British cement" in a similar manner around the same time, but did not obtain a patent until 1822. In 1824, Joseph Aspdin patented a similar material, which he called Portland cement, because the render made from it was in color similar to the prestigious Portland stone quarried on the Isle of Portland, Dorset, England. However, Aspdins' cement was nothing like modern Portland cement but was a first step in its development, called a proto-Portland cement. Joseph Aspdins' son William Aspdin had left his father's company and in his cement manufacturing apparently accidentally produced calcium silicates in the 1840s, a middle step in the development of Portland cement. William Aspdin's innovation was counterintuitive for manufacturers of "artificial cements", because they required more lime in the mix (a problem for his father), a much higher kiln temperature (and therefore more fuel), and the resulting clinker was very hard and rapidly wore down the millstones, which were the only available grinding technology of the time. Manufacturing costs were therefore considerably higher, but the product set reasonably slowly and developed strength quickly, thus opening up a market for use in concrete.
== Classification == Chronic kidney disease in cats is currently divided into four main stages by the International Renal Interest Society (IRIS) and adapted by the European Society of Veterinary Nephrology and Urology, with the creatinine concentration in blood plasma being used as the main criterion. In addition, sub-stages are defined on the basis of the protein-creatinine quotient in the urine and blood pressure. The plasma creatinine concentration should be ensured by at least two measurements at intervals of one to two weeks, the protein-creatinine quotient in the urine by two or three measurements over a period of two to four weeks. As creatinine is also influenced by other factors, since 2019 the Symmetric dimethylarginine (SDMA) is also used for assessment. In diabetic cats SDMA may be reduced.
Sources: en.wikipedia.org
It is a tripeptide of glutamic acid, cysteine, and glycine. The linkage between glutamate and cysteine uses the gamma-carboxyl group, which is unusual for peptides.
GSH is the reduced form with a free thiol group. GSSG is the oxidized dimer formed when two GSH molecules join by a disulfide bond.
It is synthesized inside cells and is not classified as an essential dietary nutrient for most people. Dietary and supplemental sources are studied, but direct requirements are not established in the same way as for vitamins.
GSH is the reduced, thiol-containing form of glutathione, while GSSG is the oxidized disulfide dimer formed when two GSH molecules react. Cells maintain a high GSH-to-GSSG ratio under normal conditions. A shift toward GSSG is often interpreted as oxidative stress, though sample handling can affect the measured ratio.