This is a working overview of Semax, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-04-25. Anything still debated is marked as such rather than presented as settled.
多数实验室与市售的 Semax 以冻干粉形式提供。冻干粉通常建议保存在 -20 °C 或更低温度下，同时避免光照与反复升温。短期运输有时采用冷藏条件，但长期保存仍以冷冻为主。分包操作应尽量减少开盖次数，以降低吸湿和微生物污染的风险。开封后若未一次用完，建议在干燥环境中密封并尽快放回低温储存。
溶液状态的稳定性明显低于冻干粉。肽类在水溶液中可能经历水解、氧化与聚集，其中甲硫氨酸和天冬酰胺等残基常是敏感位点。Semax 含有甲硫氨酸，因此氧化风险相对突出。工作液一般主张现配现用，或冷藏并在数日内用尽。缓冲液种类、pH 和离子强度都会影响降解速率，而关于最佳条件的公开数据并不统一。
常规纯度与身份确认依赖反相高效液相色谱，并辅以质谱测定分子量。氨基酸组成分析可用于验证序列构成，肽图分析则能进一步定位修饰或降解产物。杂质谱通常关注缺失序列肽、截短片段和氧化产物。不同方法的检出限并不相同，因此各实验室报告的纯度数值不宜直接横向比较。
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.
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.
| Property | Value | Notes |
|---|---|---|
| 外观 | 白色至类白色粉末 | 常见于冻干制剂 |
| 溶解度 | 易溶于水 | 在极性溶剂中一般也可溶 |
| 建议储存温度 | -20 °C | 冻干粉，避光密封 |
| 常见分析手段 | 反相高效液相色谱 | 常与质谱联用 |
| 主要降解路径 | 水解与氧化 | 溶液状态更显著 |
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.
Material sold for laboratory use varies widely in stated purity and documentation. A certificate of analysis should list the analytical method, the column and detector used, and the observed purity value. Independent verification by an outside laboratory is the practical way to confirm identity when documentation is absent or internally inconsistent. Regulatory status differs by country, and a product legal in one jurisdiction may be unapproved or controlled in another.
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.
The compound is registered in Russia as a pharmaceutical product, most commonly formulated as a nasal solution, and has been used in that setting since the 1990s. Outside that jurisdiction it is generally handled as a research chemical rather than an approved medicine. Regulatory status therefore differs sharply between countries, and material sold internationally may not correspond to the Russian pharmaceutical formulation. Documentation with commercial samples is typically limited to a certificate of analysis covering purity and identity, not clinical status or local legal classification.
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.
== Early life == Khloé Alexandra Kardashian was born on June 27, 1984, in Los Angeles, California, to Kris (née Houghton), a homemaker, and Robert, an attorney. She has two older sisters, Kourtney and Kim, and a younger brother, Rob. Their mother is of Dutch, English, Irish and Scottish ancestry, while their father was a third-generation Armenian-American. After her parents divorced in 1991, her mother married 1976 Summer Olympics decathlon winner Caitlyn Jenner (then Bruce) in 1991. Through their marriage, Kardashian gained stepbrothers Burt, Brandon, and Brody; stepsister Casey; and half-sisters Kendall and Kylie. In 1994, her father garnered public attention as a defense lawyer for football player O. J. Simpson during his murder trial. Kardashian went to Bel Air Prep, Saint Martin of Tours School, Daniel Webster Middle School, A.E. Wright Middle School, and Montclair Prep. As a teenager, she briefly attended Marymount High School, a Roman Catholic all-girls' school in Los Angeles. She left the high school and enrolled in Alexandria Academy, an alternative one-to-one school, after her sisters' graduations, later saying "there was no reason for me to stay" since she "felt like I didn't have any friends." She graduated with honors a year early at age 17. Before her family reality TV show, Kardashian worked as Nicole Richie's assistant.
=== Cardiovascular health === While AM could be an important biomarker for bacterial infections like sepsis, AM has diminished value in its utility for cardiovascular diseases (CVD), attributable to its minimal increase in these conditions and reduced half-life. AM is associated with controlling vascular integrity, blood pressure, and general cardiovascular function. Since AM has been noted for its exacerbated levels in intense diseases with an elevated concern for mortality, AM could still have some value as a predictive biomarker of harmful clinical consequences for an array of cardiovascular illnesses. AM has conservatory effects against arteriosclerosis and vascular harm. Extended AM administration or hyper-expression of its target gene in rodent model organisms diminishes vascular hyperplasia, fatty streak construction, and intimal expansion. AM also has angiogenic characteristics, leading to organ and tissue maintenance by reducing the risk of ischemic diseases. AM binds to particular receptors like calcitonin gene-related peptide (CGRP) receptors, which affects the cardiovascular system by contributing to vasodilation as well as elevated heart rate and blood pressure.
The thyroid gland received its modern name in the 1600s, when the anatomist Thomas Wharton likened its shape to that of an Ancient Greek shield or thyos. However, the existence of the gland, and of the diseases associated with it, was known long before then.
From the time of Maria Theresa (1740−1780) onward, Tyrol was governed by the central government of the Habsburg monarchy at Vienna in all matters of major importance. In 1803 the lands of the Prince-Bishoprics of Trent and Brixen were secularised and incorporated into the county.
Sources: en.wikipedia.org
Elements of biosynthesis include: precursor compounds, chemical energy (e.g. ATP), and catalytic enzymes which may need coenzymes (e.g. NADH, NADPH). These elements create monomers, the building blocks for macromolecules. Some important biological macromolecules include: proteins, which are composed of amino acid monomers joined via peptide bonds, and DNA molecules, which are composed of nucleotides joined via phosphodiester bonds.
During the 2012 Democratic presidential primaries, Sanders—dissatisfied with President Obama's "attempts to trade Social Security cuts for tax hikes"—reportedly considered running against him in the primaries. Sanders had previously suggested in 2011 that it was "a good idea" for someone to challenge Obama and "got so close to running a primary challenge ... that Senator Harry Reid had to intervene to stop him." In November 2013, Sanders suggested that Senator Elizabeth Warren could be president and that she might earn his backing if she ran. He added that if no progressive candidate ran, he might feel compelled to do so himself. In December 2014, Warren said she was not running. Sanders announced his intention to seek the Democratic Party's nomination for president on April 30, 2015. His campaign was officially launched on May 26 in Burlington. In his announcement, Sanders said, "I don't believe that the men and women who defended American democracy fought to create a situation where billionaires own the political process" and made this a central idea throughout his campaign. Warren welcomed Sanders's entry into the race, saying, "I'm glad to see him get out there and give his version of what leadership in this country should be", but never endorsed him. Initially considered a long shot, Sanders won 23 primaries and caucuses and around 46% of pledged delegates to Hillary Clinton's 54%. His campaign was noted for its supporters' enthusiasm, as well as for rejecting large donations from corporations, the financial industry, and any associated Super PAC.
Bassinger reprised the role of Stargirl in the ninth episode of the fourth season of the HBO Max series Titans, titled "Dude, Where's My Gar?"; that series exists on Earth-9 of the live action multiverse.
Sources: en.wikipedia.org
Dr (Heinz) Wuschech knows more about anabolic steroids than any doctor I have ever met, and yet he cannot discuss them openly any more than Geoff Capes or Mac Wilkins can openly discuss them in the current climate of amateur sports regulation. What I did learn in East Germany was that they feel there is little danger from anabolica, as they call it, when the athletes are kept on strictly monitored programmes. Although the extremely dangerous side-effects are admitted, they are statistically no more likely to occur than side-effects from the birth control pill. If, that is, programmes are constantly medically monitored as to dosage. Other reports came from the occasional athlete who fled to the West – 15 of them between 1976 and 1979. One, the ski-jumper Hans-Georg Aschenbach, said: "Long-distance skiers start having injections to their knees from the age 14 because of their intensive training." He said: "For every Olympic champion, there are at least 350 invalids. There are gymnasts among the girls who have to wear corsets from the age of 18 because their spine and their ligaments have become so worn... There are young people so worn out by the intensive training that they come out of it mentally blank [lessivés – washed out], which is even more painful than a deformed spine." After the 1990 German reunification, on 26 August 1993 the records were opened and evidence found that the Stasi, the state secret police, supervised systematic doping of East German athletes from 1971 until reunification in 1990.
He concluded his speech by saying that "great rejuvenation of the Chinese nation and making America great again can go hand in hand" and that "Let us meet the people's expectations and show our historical initiative, let us keep advancing the cause of friendship between our two peoples and work together to build a better world".
For example, set to a threshold of 3 μm, all cells are counted. A re-count at a threshold of 4 μm allows calculation of the number of cells of a size between 3 and 4 μm from the total counts. Diluting the blood sample 1/80 000 in a physiological saline solution allows enumeration of the erythrocytes, as the number of leukocytes does not affect the result more than by about 1/1 000 000. For the leukocyte count, cells in the same sample are hemolyzed with saponin or cetrimide so that only the nuclei of the leukocytes are counted. For platelet count, a smaller capillary diameter is used. To identify cell morphologies and variants that the counter cannot detect, microscopy remains an essential complement to the automated cell count method.
== Lipid == Lipids (oleaginous) are chiefly fatty acid esters, and are the basic building blocks of biological membranes. Another biological role is energy storage (e.g., triglycerides). Most lipids consist of a polar or hydrophilic head (typically glycerol) and one to three non polar or hydrophobic fatty acid tails, and therefore they are amphiphilic. Fatty acids consist of unbranched chains of carbon atoms that are connected by single bonds alone (saturated fatty acids) or by both single and double bonds (unsaturated fatty acids). The chains are usually 14–24 carbon groups long, but it is always an even number. For lipids present in biological membranes, the hydrophilic head is from one of three classes:
Sources: en.wikipedia.org
一般不建议常温长期保存。多数说明指向 -20 °C 冷冻避光。常温运输通常被视为短期可接受，但会加快降解风险。
公开资料对此没有统一答案。普遍建议现配现用，或冷藏并在数日内用完。含甲硫氨酸的序列更易氧化，放置时间越长风险越高。
反相高效液相色谱是最常用的手段，配合质谱确认分子量。氨基酸组成分析和肽图分析可补充序列层面的验证。
Semax is based on the ACTH(4-10) fragment, a seven-amino-acid segment of adrenocorticotropic hormone. The synthetic peptide retains the core sequence while removing regions associated with endocrine activity. This modification is intended to isolate effects on the nervous system.