semax 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 2026-07-11. Where a claim depends on a specific study, the study is described rather than over-claimed.
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。
该化合物于二十世纪八十年代在俄罗斯被开发，相关工作由俄罗斯科学院分子遗传学研究所的研究团队主导。开发目标并非复制 ACTH 的完整激素活性，而是寻找保留其神经作用方向、同时去除促肾上腺皮质激素释放效应的短肽片段。研究记录显示，这一方向促成了多个相关短肽的合成与筛选，而 Semax 是其中被研究最广泛的一个。当地文献常以 Семакс 这一名称指代它。
研究兴趣主要集中在神经营养因子相关的路径上，包括脑源性神经营养因子与神经生长因子的表达变化。部分实验报告称在特定条件下观察到这些因子的水平上升，但具体信号通路和剂量依赖关系仍未完全厘清。多数公开数据来自细胞模型和动物实验，人体对照研究数量有限。因此，该化合物的作用机制在文献中属于活跃讨论，而非已经确立的定论。
| 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 |
Solid material is normally kept at minus 20 degrees Celsius in a sealed, desiccated container. Reconstituted solutions are less stable and are usually divided into single-use aliquots before freezing. Repeated freeze-thaw cycles are avoided because they promote aggregation and loss of activity. Light exposure is minimized by using amber glassware or foil wrapping. Published stability data for this peptide are sparse, so recommended storage conditions rest mainly on general practice for short synthetic peptides rather than on dedicated study.
Identity and purity are commonly assessed by reversed-phase high-performance liquid chromatography, with ultraviolet detection near 214 nanometers for the peptide backbone. Mass spectrometry, either electrospray or matrix-assisted laser desorption, confirms molecular mass and detects truncation or modification products. Amino acid analysis can verify composition. Because the sequence contains no strongly absorbing aromatic residue apart from phenylalanine, detection wavelengths are chosen carefully. Purity values above 95 percent are typical for research-grade material.
Quality documentation for research-grade peptide usually includes a certificate of analysis stating purity, identity, and residual counterion content. Batch-to-batch variation in purity and salt form is a recognized issue, and comparisons across suppliers require attention to the exact counterion, for example acetate versus trifluoroacetate. Sequence verification by tandem mass spectrometry provides stronger evidence than a single mass measurement. For any study reporting biological results, the analytical method and the measured purity should be stated explicitly. Independent verification of supplier claims is considered good practice.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. Its chain combines the first seven residues of corticotropin with a C-terminal proline-glycine-proline extension, a modification intended to slow enzymatic breakdown. The free peptide has a molecular mass near 813.9 daltons. It belongs to the class of ACTH-derived fragments studied for central nervous system activity rather than for adrenal steroid stimulation. This structural relationship to a natural hormone fragment is the usual starting point for describing the compound in the literature.
Development took place during the 1980s at institutes of the Russian Academy of Sciences, where peptide fragments of ACTH were screened for cognitive and neuroprotective effects. The compound received regulatory approval in Russia as a nasal preparation, marketed for conditions such as ischemic stroke, transient ischemic attacks, and optic nerve disorders. Registration in other countries has not followed. Most published clinical reports originate from a small number of Russian research groups, and independent replication outside that setting remains limited. The regulatory status therefore differs sharply between Russia and the rest of the world.
Laboratory work points toward modulation of neurotrophic signaling, particularly expression of brain-derived neurotrophic factor and nerve growth factor in hippocampal tissue. Studies also describe effects on monoamine turnover, inflammatory mediators, and oxidative markers. These observations come mainly from animal models and cultured cells, so the causal chain in humans is not firmly established. Whether the reported molecular changes translate into measurable clinical benefit is an open question. Reviews generally present the mechanism as plausible rather than demonstrated.
The results were so impressive that lifters began taking more, and steroids spread to other sports. Paul Lowe, a former running back with the San Diego Chargers American football team, told a California legislative committee on drug abuse in 1970: "We had to take them [steroids] at lunchtime. He [an official] would put them on a little saucer and prescribed them for us to take them and if not he would suggest there might be a fine." Olympic statistics show the weight of shot putters increased 14 percent between 1956 and 1972, whereas steeplechasers weight increased 7.6 percent. The gold medalist pentathlete Mary Peters said: "A medical research team in the United States attempted to set up extensive research into the effects of steroids on weightlifters and throwers, only to discover that there were so few who weren't taking them that they couldn't establish any worthwhile comparisons." Brand name Dianabol is no longer produced but the drug methandrostenolone itself is still made in many countries and other, similar drugs are made elsewhere. The use of anabolic steroids is now banned by all major sporting bodies, including the ATP, WTA, ITF, International Olympic Committee, FIFA, UEFA, all major professional golf tours, the National Hockey League, Major League Baseball, the National Basketball Association, the European Athletic Association, WWE, the NFL, and the UCI. However, drug testing can be wildly inconsistent and, in some instances, has gone unenforced.
The international nature of the high seas, means they have limited policing capabilities, which makes the oceans particularly vulnerable to the illicit drug trade. Excluding the 12 - 24 nautical miles surrounding each of the littoral states, the oceans are generally not owned by any particular country. Except for in their territorial waters, law enforcement ships can do very little in terms of policing unless a vessel is registered to their own country. These problems are heightened by a lack of international agreement and cooperation, resulting in an absence of sufficient legal infrastructure to handle the problem. This problem has been overcome previously, as laws have been implemented to enable the boarding of ships in relation to other maritime crimes, such as piracy, but this has not yet been effectively implemented in regards to drug trafficking. In practice, this has meant that vessels suspected of trafficking these illegal substances cannot be boarded by law enforcement, and thus face no legal consequences. Traffickers have taken advantage of this, and are increasingly capitalising on illicit trade through maritime routes. Of the 400 million containers shipped worldwide in 2009, only 2% of these were inspected.
=== Scientific journal articles === Holick, MF (2007). "Vitamin D deficiency". N Engl J Med. 357 (3): 266–81. doi:10.1056/NEJMra070553. PMID 17634462. S2CID 18566028. Holick, MF (2006). "Resurrection of vitamin D deficiency and rickets". J Clin Invest. 116 (8): 2062–72. doi:10.1172/JCI29449. PMC 1523417. PMID 16886050. Pietras, SM; Obayan, BK; Chai, MH; Holick, MF (2010). "Vitamin D2 treatment for vitamin D deficiency and insufficiency for up to 6 years". Arch Intern Med. 169 (19): 1806–8. doi:10.1001/archinternmed.2009.361. PMID 19858440. Biancuzzo, RM; Young, A; Bibuld, D; Cai, MH; Winter, RM; Klein, EK; Ameri, A; Reitz, R; Salameh, W; Chen, TC; Holick, MF (2010). "Fortification of orange juice with vitamin D(2) or vitamin D(3) is as effective as an oral supplement in maintaining vitamin D status in adults". Am J Clin Nutr. 91 (6): 1621–6. doi:10.3945/ajcn.2009.27972. PMC 2869510. PMID 20427729. Holick, MF; Binkley, NC; Bischoff-Ferrari, HA; Gordon, CM; Hanley, DA; Heaney, RP; Murad, MH; Weaver, CM; et al. (2011). "Evaluation, treatment, and prevention of vitamin D deficiency: an Endocrine Society clinical practice guideline". J Clin Endocrinol Metab. 96 (7): 1911–30. doi:10.1210/jc.2011-0385. PMID 21646368.
== Medical uses == The most common indication for butorphanol is management of migraine using the intranasal spray formulation. It may also be used parenterally for management of moderate-to-severe pain, as a supplement for balanced general anesthesia, and management of pain during labor. Butorphanol is also quite effective at reducing post-operative shivering (owing to its kappa agonist activity). Butorphanol is more effective in reducing pain in women than in men.
Sources: en.wikipedia.org
We will keep pressing. We will keep pushing, keep advancing, no quarter, no mercy for our enemies. Yet some in this crew, in the press, just can't stop. Allow me to make a few suggestions. People look up at the TV and they see banners, they see headlines. I used to be in that business. And I know that everything is written intentionally.For example, a banner or a headline: "Mideast war intensifies," splashing on the screen the last couple of days, alongside visuals of civilian or energy targets that Iran has hit, because that's what they do. What should the banner read instead?How about, 'Iran increasingly desperate,' because they are. They know it and so do you, if it can be admitted. Or more fake news from CNN, "reports that the Trump administration underestimated the Iran war's impact on the Strait of Hormuz" – patently ridiculous, of course. For decades, Iran has threatened shipping in the Strait of Hormuz.This is always what they do, hold the strait hostage. CNN doesn't think we thought of that. It's a fundamentally unserious report. The sooner David Ellison takes over that network, the better.Another example of a fake headline that I saw yesterday, "war widening." Here's a real headline for you, for an actual patriotic press: how about, 'Iran shrinking, going underground'? You see, Iran's leaders are hiding in bunkers and moving into civilian areas. The only thing that is widening is our advantage, not to mention our Gulf partners stepping up even more, now going on the offense, and have always been with us on the defense with collective and integrated air defenses.
=== WEAA 88.9 FM === WEAA 88.9 is the NPR-affiliated public radio station of Morgan State University, and a service of the university's School of Global Journalism and Communication. It began broadcasting on January 10, 1977, with call letters standing for "We Educate African Americans." Broadcasting since 1977, WEAA 88.9 operates independently and attracts support from public donors, underwriters, and grant-makers.
=== Pharmacokinetics === Esketamine is eliminated from the human body more quickly than arketamine (R(–)-ketamine) or racemic ketamine, although arketamine slows the elimination of esketamine. The half-life of esketamine was found to be approximately 5 hours. When administered intranasally, esketamine's bioavailability is approximately 30–50%.
Sources: en.wikipedia.org
== Selected publications == Andrew E Clark; Erin J Kaleta; Amit Arora; Donna M Wolk (2013). "Matrix-assisted laser desorption ionization-time of flight mass spectrometry: a fundamental shift in the routine practice of clinical microbiology". Clinical Microbiology Reviews. 26 (3): 547–603. doi:10.1128/cmr.00072-12. PMC 3719498. PMID 23824373. Wikidata Q34653849. D M Wolk; M J Struelens; P Pancholi; et al. (2009). "Rapid detection of Staphylococcus aureus and methicillin-resistant S. aureus (MRSA) in wound specimens and blood cultures: multicenter preclinical evaluation of the Cepheid Xpert MRSA/SA skin and soft tissue and blood culture assays". Journal of Clinical Microbiology. 47 (3): 823–826. doi:10.1128/jcm.01884-08. PMC 2650929. PMID 19144803. Wikidata Q41783624. Stephanie S Buehler; Bereneice Madison; Susan R Snyder; et al. (2016). "Effectiveness of Practices To Increase Timeliness of Providing Targeted Therapy for Inpatients with Bloodstream Infections: a Laboratory Medicine Best Practices Systematic Review and Meta-analysis". Clinical Microbiology Reviews. 29 (1): 59–103. doi:10.1128/cmr.00053-14. PMC 4771213. PMID 26598385. Wikidata Q26776404.
An amphibolic pathway is one that can be either catabolic or anabolic based on the availability of or the need for energy. The currency of energy in a biological cell is adenosine triphosphate (ATP), which stores its energy in the phosphoanhydride bonds. The energy is utilized to conduct biosynthesis, facilitate movement, and regulate active transport inside of the cell. Examples of amphibolic pathways are the citric acid cycle and the glyoxylate cycle. These sets of chemical reactions contain both energy producing and utilizing pathways. To the right is an illustration of the amphibolic properties of the TCA cycle. The glyoxylate shunt pathway is an alternative to the tricarboxylic acid (TCA) cycle, for it redirects the pathway of TCA to prevent full oxidation of carbon compounds, and to preserve high energy carbon sources as future energy sources. This pathway occurs only in plants and bacteria and transpires in the absence of glucose molecules.
Alcohol has a long association of military use, and has been called "liquid courage" for its role in preparing troops for battle, anesthetizing injured soldiers, and celebrating military victories. It has also served as a coping mechanism for combat stress reactions and a means of decompression from combat to everyday life.
ErythroMer is a red blood cell substitute in development by KaloCyte, supported with funding by the National Institutes of Health, U.S. Department of Defense, and private investment. Similar to other hemoglobin-based oxygen carriers, the product is stable for several months even when freeze-dried. It can be reconstituted from this lyophilized state in emergencies. This opens up the possibility of eventual stockpiling of ErythroMer, making it easier to supply blood in large amounts to those who need it. The development of this technology was done at Washington University in St. Louis and University of Illinois Urbana-Champaign. Trials have been successful in rats, mice, and rabbits, and human trials are planned. ErythroMer is a reddish blood powder composed of hemoglobin from humans. By coating it with a synthetic polymer, it can sense pH changes, allowing for oxygen pick up in areas where the pH levels are high and disposal where they are low. In the spring of 2024, ErythroMer showed promise in pre-clinical testing. In animal testing, it effectively delivered oxygen and helped revive animals with significant blood loss. In 2025, KaloCyte announced a licensing agreement with Chrysea for ErythroMer production.
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。
不是。Semax 是完全人工合成的七肽，自然界中没有对应的已知肽段。它的设计灵感来自促肾上腺皮质激素片段 ACTH(4-10)，但序列经过了替换和延长。