neurotrophic signaling 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.
Updated 2026-07-23. Numbers and descriptions here follow the published literature rather than marketing material.
Identity and purity of semax are established with reversed-phase high-performance liquid chromatography coupled to ultraviolet detection, usually at 214 nanometres. Mass spectrometry, most often electrospray ionisation in positive mode, confirms the molecular mass and reveals truncated sequences. Amino acid analysis and peptide mapping after enzymatic digestion provide additional structural confirmation. Laboratories typically report purity as the percentage area of the main peak, a figure that does not capture isomeric or oxidised variants unless the method resolves them.
The peptide is prone to several degradation pathways. Oxidation of the methionine residue produces a sulfoxide that elutes close to the parent peak in many chromatographic systems. Hydrolysis of peptide bonds and deamidation of susceptible residues in related sequences also reduce purity over time. Lyophilised material kept dry at minus twenty degrees Celsius and shielded from light is the most stable form commonly described in laboratory practice.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It corresponds to the ACTH(4-7) fragment extended at the C-terminus by a Pro-Gly-Pro tripeptide, an addition intended to slow enzymatic breakdown. The molecular formula is C37H51N9O10S and the molecular mass is approximately 814 daltons. In the literature it is often described as an ACTH(4-10) analog, although that label reflects a naming convention as much as a precise structural relationship. The compound was developed in Russia and remains most closely associated with that research tradition.
Laboratory descriptions of the material are consistent across suppliers. It appears as a white to off-white lyophilized powder that dissolves readily in water and in polar organic solvents such as dimethyl sulfoxide. Aqueous solutions are clear and colorless at low concentrations. Because the peptide contains methionine, oxidation at the sulfur atom is a recognized degradation pathway, and handling notes usually call for protected, desiccated storage. Reported purity for research-grade lots is generally above 95 percent as measured by reversed-phase high-performance liquid chromatography.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Lyophilised solid |
| Solubility class | Freely soluble in water | Also dissolves in aqueous buffers |
| Typical storage temperature | -20 °C | Dry, desiccated, protected from light |
| Typical analytical method | RP-HPLC with UV detection | Often paired with LC-MS |
| Water content | Reported as Karl Fischer value | Freeze-dried material is hygroscopic |
Published research covers ischemic stroke, traumatic brain injury, cognitive impairment, optic nerve conditions and attention-related measures. Much of the human evidence comes from small trials conducted in one country, which limits how far the results generalize. Animal models supply the larger share of the data, and effects seen in rodents do not transfer automatically to people. Reviews have noted that methodological reporting is often incomplete, making it difficult to pool results or compare treatment schedules across studies.
Pharmacokinetic accounts emphasize rapid breakdown. After intravenous dosing the intact peptide disappears from blood within minutes, and nasal delivery produces low but measurable concentrations. Metabolites rather than the parent molecule may account for part of the observed activity, although the relative contribution is unresolved. Dosing in the literature varies widely and no optimal schedule has been agreed. These gaps are regularly cited as a reason the findings have not produced broad clinical adoption beyond the original research setting.
各国监管态度分化明显。俄罗斯按处方药管理，部分东欧国家留有使用记录；欧盟与美国未批准其作为药物上市，市面流通品通常标注为研究用化学品。身份差异意味着标示含量、纯度与无菌性缺少统一核查。体育领域还牵涉反兴奋剂名录，跨境携带则受目的地药品法规约束。
Semax 是人工设计的七肽，序列为 Met-Glu-His-Phe-Pro-Gly-Pro，骨架取自促肾上腺皮质激素片段 ACTH(4-10)。它于二十世纪八十年代在苏联的分子遗传学研究机构内合成。设计目标是保留该片段与注意力和记忆相关的活性，同时剔除促皮质激素释放等内分泌作用。此后俄罗斯将其登记为药品并进入临床使用。
当时的短肽研究普遍关注能否穿越血脑屏障、在低剂量下产生中枢效应，Semax 属于这一路线。鼻内给药是其主要使用方式，俄语文献报道的适应症涵盖缺血性卒中、短暂性脑缺血发作、认知功能减退以及视神经病变。这些研究大多发表在当地期刊上，样本规模与终点设置同西方试验惯例存在差异，国际同行对其临床证据的强度看法不一。
However those who drink 2–4 cups per day may be at a slightly increased risk. Caffeine increases intraocular pressure in those with glaucoma but does not appear to affect normal individuals. It may protect people from liver cirrhosis. There is no evidence that coffee stunts a child's growth. Caffeine may increase the effectiveness of some medications including ones used to treat headaches. Caffeine may lessen the severity of acute mountain sickness if taken a few hours prior to attaining a high altitude.
Jack Straw (born 3 August 1946), Christian, of Eastern European Jewish ancestry; served in Cabinet under Labour governments of Tony Blair and Gordon Brown as Home Secretary and Foreign Secretary; has written for The Guardian, Daily Mail, El País, The Independent, The Mirror UK, The Sun, The Telegraph, Financial Times, The Times, POLITICO, LSE Connect, Prospect Magazine, The New European and is author or co-author of the following books; The English Job: Understanding Iran and Why It Distrusts Britain (2019) ISBN 978-1785903991; Implementation of the Human Rights Act 1998: Minutes of Evidence, Wednesday 14 March 2001 (2001) ISBN 0-10-442701-9; Making Prisons Work: Prison Reform Trust Annual Lecture (1998) ISBN 0-946209-44-8; Future of Policing and Criminal Justice (Institute of Police & Criminological Studies Occasional Paper S.) (1996) ISBN 1-86137-087-3 and Policy and Ideology (1993) ISBN 0-9521163-0-8 John Strawson, author of Encountering Islamic law, Partitioning Palestine: Legal Fundamentalism in the Palestinian-Israeli Conflict and editor of Law after Ground Zero and Tracking the Postcolonial in Law; also law professor at the University of East London School of Law, teaching International law and Middle East Studies; specialises in law and postcolonialism, with particular reference to middle east, Islam and international law; previous posts include visiting positions at Birzeit University (Palestine) and the Institute of Social Studies (The Hague Netherlands); researches encounter between western and Islamic law; is Director of Law Postgraduate Programmes at University of East London, and Director of the Centre on Human Rights in Conflict; believes use of term apartheid to describe Israel or Israeli policies does not apply to Israel, and use of analogy is unhistorical, and unhelpful. 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Arthur Waley (1889–1966); orientalist and sinologist of Ashkenazi ancestry; renowned for his translations of Chinese and Japanese poetry; awarded the CBE in 1952, the Queen's Gold Medal for Poetry; invested as a Companion of Honour in 1956. Natasha Walter (born 20 January 1967), feminist writer, novelist, human rights activist, founder of charity Women for Refugee Women; father was Nicolas Walter, an anarchist and secular humanist writer; of German Jewish ancestry; journalist forVogue magazine; Deputy Literary Editor of The Independent; columnist and feature writer for The Guardian; appear regularly on BBC2's Newsnight Review and Radio 4's Front Row; was judge on the Booker Prize and was a judge on the Women's Prize for Fiction (formerly the Orange Prize); was the founder in 2006 of the charity Women for Refugee Women, where she was the director until 2021. The charity supports women who seek asylum to tell their stories and challenges injustices they experience. She was recognized as one of the BBC's 100 women of 2013. Nicolas Walter (22 November 1934 – 7 March 2000) was a British anarchist and atheist writer, speaker and activist. He was a member of the Committee of 100 and Spies for Peace, and wrote on topics of anarchism and humanism. Fredric Warburg (27 November 1898 – 25 May 1981), author, publicist, publisher best known for association with George Orwell. Besides his own work as an author, he promoted and published Franz Kafka. Other notable publications included The Third Eye by Lobsang Rampa, Adolf Hitler's Mein Kampf and William Shirer's The Rise and Fall of the Third Reich. Ruby Wax (née Wachs; born 19 April 1953) is an American-British actress, author of popular self-help books, comedian, television personality, and popular mental health campaigner, of Austrian Jewish descent; appointed Chancellor of the University of Southampton; Wax also teaches business communication in the public and private sectors. 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Meanwhile, her writing about British government policy toward victims after the Holocaust and contemporary British antisemitism has appeared in The Independent and Haaretz. Stephen Winsten, (1893–1991) was the name adopted by Samuel Weinstein, one of the 'Whitechapel Boys' group of young Jewish men and future writers in London's East End in the years before World War I (the others included Isaac Rosenberg, John Rodker and Joseph Leftwich). In the First World War he was a conscientious objector, and imprisoned in Bedford and Reading gaols. He is now known for his works about George Bernard Shaw, and his writing on the life of Henry Salt. Robert Winston, Baron Winston (born 15 July 1940), British professor, author, journalist, medical doctor, scientist, television presenter and Labour Party politician.He is a member of Labour Friends of Israel; father of Ben Winston, renowned for producing a number of the annual Brit Awards from 2011 to 2014 and more recently he was a co-producer of US Grammy Awards and Tony Awards. Ludwig Wittgenstein (26 April 1889 – 29 April 1951) was an Austrian-Jewish British philosopher who worked primarily in logic, the philosophy of mathematics, the philosophy of mind, and the philosophy of language. He is considered by some to be the greatest philosopher of the 20th century. Richard Wollheim (5 May 1923 − 4 November 2003), prolific author noted for work on mind and emotions related to visual arts, specifically, painting; served as president of the British Society of Aesthetics; was Grote Professor of Mind and Logic, professor at Columbia University and University of California at Berkeley and lecturer at Balliol College, Harvard University, the University of Minnesota, Graduate Center, CUNY, the University of California at Davis; gave Andrew M. Mellon lectures in Fine Arts, National Gallery of Art, Washington; his book Art and its Objects considered one of the twentieth century's most influential texts on philosophical aesthetics; known for philosophical treatments of depth psychology, especially Sigmund Freud's Jonathan Wolff (born 1959) author of seven Oxford University Press academic books and numerous monographs and journals, philosopher and scholar; Professor of Values and Public Policy at the Blavatnik School of Government at the University of Oxford; Governing Body Fellow at Wolfson College; previously at University College London (UCL), where he was Professor of Philosophy and Dean of the Faculty of Arts and Humanities; was secretary of the British Philosophical Association and has been Editor and honorary secretary of the Aristotelian Society; presented a four-part series about the UK's National Health Service (NHS) for the BBC's Radio 3; was member of the Nuffield Council on Bioethics; was elected Fellow of the British Academy in 2023. Leonard Woolf, writer and activist Bat Ye'or (born 1933), best known for creating and popularising Eurabia conspiracy theory in her writings about modern Europe. Tamar Yellin (b. 1963), author whose first novel, The Genizah at the House of Shepher, won Sami Rohr Prize for Jewish Literature; granddaughter of Yitzhak Yaakov Yellin (1885–1964), pioneer of Hebrew language press in Palestine; Jane Yolen (February 11, 1939) is an American writer of fantasy and part-time resident in the UK, science fiction, and children's books. She is the author or editor of more than 400 books, of which the best known is The Devil's Arithmetic, a Holocaust novella Israel Zangwill (1864–1926), novelist and playwright. Zangwill was a British author at the forefront of cultural Zionism during the 19th century, and was associate of Theodor Herzl, later rejecting search for a Jewish homeland in Palestine. Father of Oliver Zangwill and husband of Suffragette Edith Ayrton. Theodore Zeldin, writer
Pilonidal cysts can recur, and do so more frequently if the surgical wound is sutured in the midline, as opposed to away from the midline, which obliterates the natal cleft and removes the focus of shearing stress. An incision lateral to the intergluteal cleft is therefore preferred, especially given the poor healing of midline incisions in this region. Minimally invasive techniques with no wound and rapid return to full activities have been reported but await double-blind randomized trials. Another technique is to treat the pilonidal sinus with fibrin glue. This technique is of unclear benefit as of 2017 due to insufficient research. The evidence for any treatment is of low quality, and care must be taken not to overinterpret any study in this field. Since the 2010s, several minimally invasive techniques have been developed to minimize the impact of surgery on patients and achieve less pain and shorter recovery times. In some cases, the wounds are left open after surgery to heal naturally instead of being closed with stitches. There are a lot of different dressings and topical agents (creams or lotions) that are available to help these open wounds heal. A 2022 systematic review brought together evidence from 11 studies that compared dressings and topical agents for treating open wounds after surgical treatment for pilonidal sinus of the buttocks.
Sources: en.wikipedia.org
== 1980s == Though contacts were restricted after the Gleneagles Agreement in 1977, there were controversial tours in 1980 by the British Lions and by France, in 1981 by Ireland, and in 1984 by England. In 1986, though a Lions tour was cancelled, South Africans played in all-star matches in Cardiff and in London marking the IRB centenary. South Africa was excluded from the first two Rugby World Cups, in 1987 and 1991. In 1982 the political relationship between Australia and Argentina was also damaged due to the Falklands War. The Soviet Union supposedly turned down its invitation to the 1987 Rugby World Cup, because of its distaste for the apartheid regime of South Africa. However, South Africa was not invited in the end. While the Great Soviet Encyclopedia states that rugby is popular in Great Britain, New Zealand, France, Romania and Australia, it tellingly makes no mention of South Africa. Chris Thau says that France approached the USSR before 1987 on the issue, and that the Soviets said that they would be happy to participate if South Africa was not invited. In the end, South Africa was not invited, but the USSR did not attend either. It has been said that:
The diver needs to stay on the bottom to work some of the time, and may need to have neutral buoyancy some of the time. The diving suit is usually buoyant, so added weight is usually necessary. This can be provided in several ways. Unwanted positive buoyancy is dangerous to a diver who may need to spend significant time decompressing during the ascent, so the weights are usually attached securely to prevent accidental loss.
Solid phase microextraction, or SPME, is a solid-phase extraction sampling technique that involves the use of a fiber coated with an extracting phase, that can be a liquid (polymer) or a solid (sorbent), which extracts different kinds of analytes (including both volatile and non-volatile) from different kinds of media, that can be in liquid or gas phase. The quantity of analyte extracted by the fibre is proportional to its concentration in the sample as long as equilibrium is reached or, in case of short time pre-equilibrium, with help of convection or agitation.
The DNA passing through the nanopore changes its ion current. This change is dependent on the shape, size and length of the DNA sequence. Each type of the nucleotide blocks the ion flow through the pore for a different period of time. The method does not require modified nucleotides and is performed in real time. Nanopore sequencing is referred to as "third-generation" or "long-read" sequencing, along with SMRT sequencing. Early industrial research into this method was based on a technique called 'exonuclease sequencing', where the readout of electrical signals occurred as nucleotides passed by alpha(α)-hemolysin pores covalently bound with cyclodextrin. However the subsequent commercial method, 'strand sequencing', sequenced DNA bases in an intact strand. Two main areas of nanopore sequencing in development are solid state nanopore sequencing, and protein based nanopore sequencing. Protein nanopore sequencing utilizes membrane protein complexes such as α-hemolysin, MspA (Mycobacterium smegmatis Porin A) or CssG, which show great promise given their ability to distinguish between individual and groups of nucleotides. In contrast, solid-state nanopore sequencing utilizes synthetic materials such as silicon nitride and aluminum oxide and it is preferred for its superior mechanical ability and thermal and chemical stability. The fabrication method is essential for this type of sequencing given that the nanopore array can contain hundreds of pores with diameters smaller than eight nanometers.
Sources: en.wikipedia.org
Reversed-phase high-performance liquid chromatography is the standard method, with detection in the ultraviolet range. Peak area percentage yields a purity figure for the main component. Mass spectrometry is normally run alongside to confirm molecular identity.
Dry lyophilised powder is generally kept at minus twenty degrees Celsius, protected from light and moisture. Repeated freeze-thaw cycles are avoided because they encourage aggregation and moisture uptake. Solutions are less stable than the solid form and degrade faster at room temperature.
A certificate documents what the supplier measured, not what an independent party confirmed. Methods, instruments and acceptance criteria can differ between suppliers. Third-party testing is the usual way to resolve discrepancies.
It is registered as a pharmaceutical product in Russia, where it is typically supplied as a nasal solution. In most other countries it is not an approved drug and is traded as a research chemical instead. Approval status depends entirely on the jurisdiction involved.