The short version of 甲硫氨酸氧化 fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2025-08-24. Anything still debated is marked as such rather than presented as settled.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. Its design combines the ACTH(4-7) core fragment with a C-terminal Pro-Gly-Pro extension, a modification intended to improve stability and prolong activity. The molecule is hydrophilic, carries no lipid chains or glycosylation, and has a theoretical mass just over 810 daltons in its free form. All seven residues are proteinogenic amino acids, so no non-natural building blocks appear in the backbone. A free N-terminal methionine and C-terminal proline define the unmodified parent peptide.
The compound was developed during the 1980s at the Institute of Molecular Genetics in Moscow as part of research on fragments of adrenocorticotropic hormone. Early work examined short ACTH-derived sequences that retained neurotrophic effects while lacking the endocrine activity of the full hormone. Semax entered clinical use in Russia during the 1990s, where it received registration for several neurological indications. Outside that region it remained primarily a laboratory research material rather than an approved therapeutic. English-language literature on it grew more slowly and frequently cited the original Russian studies.
Terminology around the compound varies by source. It appears in catalogues and papers as Semax, as the heptapeptide ACTH(4-7)-Pro-Gly-Pro, and under various alphanumeric laboratory codes used by individual suppliers. These names refer to the same sequence but may imply different salt forms, purity grades, or counter-ions. Peptide databases usually list the free base mass, while product descriptions sometimes report acetate or trifluoroacetate salts with a different formula weight. Because naming conventions for research peptides are not standardised across vendors, checking the declared sequence and measured mass is more reliable than relying on a trade name alone.
Published studies examine a fairly narrow set of endpoints. Rodent experiments commonly measure maze learning, infarct volume after induced ischemia, and tissue levels of neurotrophic factors. Clinical reports from Russian centres describe attention, memory and recovery scores in patients after stroke or transient ischemic attack. Most of those human studies are small and few have been repeated by independent groups. Outcome measures differ between studies, which limits direct comparison.
Circulation time for the peptide is short because peptidases cleave it readily. The Pro-Gly-Pro tail is thought to slow breakdown compared with the bare ACTH fragment, but the gain appears modest. Absorption after intranasal dosing is limited, and only a fraction of a dose is expected to reach the central nervous system. Laboratory concentrations therefore sit well above levels achieved systemically, a gap that complicates translation from bench findings to clinical claims.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic heptapeptide | ACTH(4-7) analogue |
| Sequence | Met-Glu-His-Phe-Pro-Gly-Pro | Free N terminus, unmodified side chains |
| Molecular weight | 813.9 Da | Free base; salt forms differ |
| Appearance | White to off-white powder | Lyophilised solid |
| Solubility | Freely soluble in water | Hydrophilic; polar solvents preferred |
Scientific literature on semax is unevenly distributed. A substantial share of published work originates from a small number of laboratories in Russia, while independent replication elsewhere is limited. Human data consist mostly of small trials with short follow-up, and several reported outcomes rely on subjective rating scales. Questions about how much intact peptide reaches the central nervous system after nasal administration, and how long it persists there, are still unresolved. The compound is best described as an active research subject rather than a settled pharmacological agent.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It was derived from the ACTH(4-10) fragment, a short segment of adrenocorticotropic hormone that lacks the hormonal activity associated with the full-length peptide. Researchers at the Institute of Molecular Genetics in Moscow developed the compound during the 1980s. It has been registered as a pharmaceutical product in Russia and several neighbouring countries, where it is supplied as a nasal solution, and it is also sold internationally as a research chemical.
The proposed mechanism centres on neurotrophic signalling rather than direct receptor activation. Semax is reported to increase expression of brain-derived neurotrophic factor and nerve growth factor in several brain regions, and to shift the balance between excitatory and inhibitory neurotransmitter systems. Interaction with melanocortin receptors has been suggested because of the parent ACTH fragment. Many of these findings come from rodent studies, and the extent to which they translate to human physiology remains an open question.
纯度评估以反相高效液相色谱为主，通过主峰面积百分比给出粗略结果，再配合电喷雾质谱核对分子量。氨基酸分析可验证组成比例，手性色谱或毛细管电泳用于检查残基构型。常见杂质包括缺失序列的短肽、氧化产物与二聚体。由于多数市售品不附带完整检验报告，独立第三方检测常被用来核实标称值。
从分子层面看，Semax 是线性七肽，没有二硫键、糖基或脂链修饰，N 端为游离氨基，C 端为游离羧基。分子含组氨酸与谷氨酸侧链，因此在水和甲醇等极性溶剂中溶解良好，在非极性溶剂中溶解有限。计算分子量约为 814 Da，与其质子化离子的质荷比吻合，可用于质谱确认。
Russian regulatory authorities approved the peptide for nasal administration, and it remains listed in the national pharmacopoeia under several trade names. Documented indications include acute ischemic stroke, transient ischemic attacks, traumatic brain injury, and certain ophthalmological and neurological conditions. Physicians also prescribe it for cognitive complaints in older patients, although the evidence base for that use is thinner. Outside Russia and a few neighboring states, the substance is not an approved medicine and is sold instead as a research chemical.
Later generations of the molecule include an N-acetylated form and an amidated form, both marketed online alongside the parent peptide. These variants differ in terminal chemistry and stability, and they are frequently discussed in the same breath even though they have not been compared in controlled trials. Supply outside formal healthcare systems comes largely from laboratories that synthesize peptides to order. Purity and identity of these materials vary widely, and no single body oversees the international trade.
Semax is a synthetic heptapeptide developed in the Soviet Union during the 1980s by researchers at the Institute of Molecular Genetics in Moscow. It was designed as a truncated analog of adrenocorticotropic hormone, retaining only the fragment spanning residues four through ten. Investigators sought a peptide that would preserve the cognitive effects associated with ACTH while eliminating the hormonal stimulation of the adrenal cortex. The compound entered clinical use in Russia during the following decade.
=== New ownership === In December 2017, Patrick Cryne and his family sold an 80% stake in the club to NewCity Capital's Chien Lee and Pacific Media Group's Paul Conway. They were joined by Indian investor Neerav Parekh and Billy Beane, minority owner of and advisor for the Athletics, who was widely known for the Moneyball film portrayal, as part of an international investor consortium. Barnsley were relegated to the third tier in 2017–18. Following this, the new owners adopted a data-driven approach to identify talents, focusing on young players and team rebuilding. The club appointed Daniel Stendel as head coach, who introduced a high-pressing style of play. Barnsley were promoted back to the Championship the following season. In the 2019–20 season, under new coach Gerhard Struber, Barnsley avoided relegation from the Championship. In 2020–21, under the management of Valérien Ismaël, Barnsley finished fifth place and reached the EFL Championship Play-offs for the first time in 24 years, doing so with the youngest squad and one of the smallest budgets in the division. The Wall Street Journal called Barnsley a "Moneyball experiment". Prior to the 2021–22 season, Markus Schopp was appointed as the new head coach. In November 2021, he was dismissed after seven consecutive defeats. Three weeks later Poya Asbaghi was appointed as his successor. Fortunes improved little as Barnsley were relegated from the 2021–22 EFL Championship following a 2–1 defeat against Huddersfield Town. Asbaghi left the club by mutual consent shortly afterwards.
In the case of neutrophilic pericholangitis, neutrophils surround the portal ducts and obstruct them. Neutrophilic pericholangitis has a variety of causes including endotoxemia, Hodgkin's disease, among others. Cholangitis lenta can also cause changes to the portal tracts. This occurs during chronic cases of sepsis and results in dilation of the bile ductules. Cholangitis lenta is likely a result of a stoppage of bile secretion and bile flow through the ductules. Back pressure created from obstructive cholestasis can cause dilation of the bile duct and biliary epithelial cell proliferation, mainly in the portal tracts. Portal tract edema may also occur as a result of bile retention, as well as periductular infiltration of neutrophils. If the obstruction is left untreated, it can lead to a bacterial infection of the biliary tree. Infection is mostly caused by coliforms and enterococci and is evident from a large migration of neutrophils to the duct lumina. This can result in the formation of a cholangitic abscess. With treatment, many of the histological features of cholestasis can be corrected once the obstruction is removed. If the obstruction is not promptly resolved, portal tract fibrosis can result. Even with treatment, some fibrosis may remain.
=== Conformation change mechanism pathway (without proteolysis) === αVβ6 integrin was the first integrin to be identified as TGF-β1 activator. LAPs contain an RGD motif which is recognized by vast majority of αV containing integrins, and αVβ6 integrin can activate TGF-β1 by binding to the RGD motif present in LAP-β1 and LAP-β3. Upon binding, it induces adhesion-mediated cell forces that are translated into biochemical signals which can lead to liberation/activation of TGFb from its latent complex. This pathway has been demonstrated for activation of TGF-β in epithelial cells and does not associate MMPs.
L-aspartate-4-semialdehyde + NADP+ + phosphate Once L-aspartate-4-semialdehyde is synthesized, the molecule can then progress down a number of pathways. One possible pathway requires L-aspartate-4-semialdehyde to undergo a reaction catalyzed by the enzyme dihydrodipicolinate synthase in order to form the molecule dihydrodipicolinate. This reversible chemical reaction is shown below:
Sources: en.wikipedia.org
As part of the discovery phase, Valve received a number of documents in Korean, which a new intern at Valve was able to translate, purporting that Vivendi had directed the destruction of evidence for the case. When shown to the court, the judge took action to block Vivendi's countersuits, turning the case in Valve's direction. On November 29, 2004, Judge Thomas Samuel Zilly of the U.S. District Court for the Western District of Washington ruled in favor of Valve. The ruling stated that Vivendi Universal and its affiliates (including Sierra) were not authorized to distribute Valve games, either directly or indirectly, through cyber cafés to end users for pay-to-play activities pursuant to the parties' publishing agreement. In addition, Judge Zilly ruled that Valve could recover copyright damages for infringements without regard to the publishing agreement's limitation of liability clause. Valve posted on the Steam website that the companies had come to a settlement in court on April 29, 2005. As a result of the trial, the arbitrator also awarded Valve $2,391,932.
The urease agar slant is used to measure an organism's ability to produce urease, an enzyme capable to digesting urea in carbon dioxide and ammonia through hydrolysis. Because ammonia is alkaline, the media contains phenol red, an indicator that changes from orange to pink when a pH increases above 8.1. When ammonia is increased to high enough concentrations, the media will change to a pink color, indicating the presence of urease production.
=== Hemoglobin synthesis and function === PLP aids in the synthesis of hemoglobin, by serving as a coenzyme for the enzyme aminolevulinic acid synthase. It also binds to two sites on hemoglobin to enhance the oxygen binding of hemoglobin.
The United Nations Security Council responded swiftly to the killing by later imposing an arms embargo against South Africa. After a period of routine harassment against his family by the authorities, as well as fearing for his life, Woods fled the country after being placed under house arrest by the South African Government. Woods later wrote a book in 1978 entitled Biko, exposing police complicity in his death. That book, along with Woods's autobiography Asking For Trouble, both being published in the United Kingdom, became the basis for the film.
Fabrication and coating of nanodevices and medical implants to increase biocompatibility. Emulsifiers in food industry and personal care products. Hydrophobins' high stability can be very useful in the coating of surfaces of prolonged use or under harsh conditions. The easy dissociation of a class II hydrophobin monolayer might be desirable and this can easily be achieved by the use of detergents and alcohols. The use of hydrophobins in protein purification, drug delivery and cell attachment has been reported. For more about the potential biotechnological applications of hydrophobins see Hektor & Scholtmeijer (2005) and Cox & Hooley (2009).
Sources: en.wikipedia.org
== Ethylene derivatives == These are generally mustard oils, which are characterized by a burning taste; their principal occurrence is in mustard and Tropaeolum seeds. Sinigrin, or the potassium salt of inyronic acid not only occurs in mustard seed, but also in black pepper and in horseradish root. Hydrolysis with barium hydroxide, or decomposition by the ferment myrosin, gives glucose, allyl mustard oil and potassium hydroxide. Sinalbin occurs in white pepper; it decomposes to the mustard oil, glucose and sinapin, a compound of choline and sinapic acid. Jalapin or Scammonin occurs in scammony; it hydrolyses to glucose and jalapinolic acid.
== See also == Artificial Intelligence Act — 2024 European Union regulation Privacy laws of the United States Use of artificial intelligence by the United States Department of Defense Americans for Responsible Innovation - nonprofit advocacy group
According to various regulations, such as the international ISO 15189 norm, all pathological laboratory results must be verified by a competent professional. In some countries, staffs composed of clinical scientists do the majority of this work inside the laboratory with certain abnormal results referred to the relevant pathologist. Doctor Clinical Laboratory scientists have the responsibility for limited interpretation of testing results in their discipline in many countries. Interpretation of results can be assisted by some software in order to validate normal or non-modified results. In other testing areas, only professional medical staff (pathologist or clinical Laboratory) is involved with interpretation and consulting. Medical staff are sometimes also required in order to explain pathology results to physicians. For a simple result given by phone or to explain a technical problem, often a medical technologist or medical lab scientist can provide additional information. Medical laboratory departments in some countries are exclusively directed by a specialized Doctor laboratory Science. In others, a consultant, medical or non-medical, may be the head the department. In Europe and some other countries, Clinical Scientists with a Masters level education may be qualified to head the department. Others may have a PhD and can have an exit qualification equivalent to medical staff (e.g., FRCPath in the UK). In France, only medical staff (Pharm.D. and M.D. specialized in anatomical pathology or clinical Laboratory Science) are authorized to discuss laboratory results.
=== Names === Etifoxine is the generic name of the drug and its INNTooltip International Nonproprietary Name, BANTooltip British Approved Name, and DCFTooltip Dénomination Commune Française. It is also known by the older and much-lesser-used synonym etafenoxine and by its developmental code name Hoe 36801. Etifoxine is marketed under the brand name Stresam. It has also been marketed under the brand name Strezam.
Sirolimus, also known as rapamycin and sold under the brand name Rapamune among others, is a macrolide compound that is used to coat coronary stents, prevent organ transplant rejection, treat a rare lung disease called lymphangioleiomyomatosis, and treat perivascular epithelioid cell tumour (PEComa). It has immunosuppressant functions in humans and is especially useful in preventing the rejection of kidney transplants. It is a mammalian target of rapamycin (mTOR) kinase inhibitor that reduces the sensitivity of T cells and B cells to interleukin-2 (IL-2), inhibiting their activity. This compound also has a use in cardiovascular drug-eluting stent technologies to inhibit restenosis.
Sources: en.wikipedia.org
It is a synthetic seven-amino-acid peptide built from the ACTH(4-7) sequence plus a Pro-Gly-Pro tail. It belongs to the family of short ACTH fragments studied for nervous-system effects. Its backbone contains only standard amino acids.
It contains the 4-7 fragment of adrenocorticotropic hormone extended at the C terminus. That truncation removes the region associated with steroidogenic activity. The design intent was to keep neurotrophic properties while avoiding full hormonal effects.
No natural source of the intact heptapeptide is known. It is produced by solid-phase peptide synthesis. Some related ACTH fragments arise as hormone processing products, but the Pro-Gly-Pro extension is a designed addition rather than a natural sequence.
It consists mainly of animal experiments and small clinical reports, with much of the clinical material published in Russian-language journals. Large independent trials are scarce. Separating reliable effects from chance findings is consequently difficult.