Semax is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2025-11-08. Numbers and descriptions here follow the published literature rather than marketing material.
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。
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。
The parent fragment ACTH(4-10) carries the sequence Met-Glu-His-Phe-Arg-Trp-Gly. Semax replaces the arginine and tryptophan positions with a proline-glycine-proline tail, giving Met-Glu-His-Phe-Pro-Gly-Pro. That change removes residues associated with adrenal stimulation, so the peptide does not drive cortisol release the way full ACTH does. This distinction shapes how the compound is grouped in the literature, where it sits with neuropeptides and peptide neuromodulators rather than with corticosteroids.
Regulatory status varies sharply by country. Semax is registered for medical use in Russia, where it appears in formularies as a nasal solution, and it also holds registration in a small number of neighbouring states. It has no approval from the United States Food and Drug Administration or the European Medicines Agency, and it is not a scheduled controlled substance in most jurisdictions. Elsewhere it circulates mainly as laboratory material, so purity documentation comes from suppliers rather than from a national pharmacopoeia.
| 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 |
Semax is normally supplied as a lyophilized powder, and that form is the most stable. Suppliers commonly recommend storage at -20 °C in a desiccated container protected from light, with short-term handling at room temperature limited to weighing and transfer. Powder that has absorbed moisture degrades faster, so vials should be warmed to ambient temperature before opening to prevent condensation on the contents. Hygroscopic behavior is typical of short hydrophilic peptides, and humidity control matters more than temperature alone for long-term retention.
Once dissolved, the peptide is considerably less stable than the solid. Aqueous solutions are usually prepared at neutral to slightly acidic pH, filtered, and divided into single-use aliquots before freezing. Repeated freeze-thaw cycles are a common cause of avoidable loss and are best prevented by never refreezing a thawed aliquot. Adsorption to plastic and glass surfaces can lower the measured concentration of dilute solutions, particularly below roughly 0.1 mg/mL. Buffer choice, salt content, and container material all influence how much peptide remains detectable after storage.
Development of the compound took place in the Soviet Union during the 1980s, largely through peptide research groups affiliated with the Shemyakin-Ovchinnikov Institute and Moscow State University. Investigators screened fragments of adrenocorticotropic hormone for activity on the central nervous system while attempting to separate cognitive effects from hormonal ones. The shortened sequence was selected because it retained behavioral activity in animal models without stimulating corticosteroid release. Early publications described the molecule as an ACTH(4-10) analog.
Published research on this peptide originates mainly from Russian laboratories, and the wider international literature is comparatively thin. Studies have used rodent models of stroke, hypoxia, and memory tasks, with a smaller number of human trials reported. Reported outcomes include changes in attention and memory measures, along with effects on neurotrophic factor expression in some experiments. Small sample sizes, inconsistent dosing protocols, and limited independent replication are widely noted limitations, so the strength of the clinical evidence remains an open question.
Semax is a synthetic heptapeptide whose sequence is Met-Glu-His-Phe-Pro-Gly-Pro. The first four residues correspond to the ACTH(4-10) fragment, while the terminal Pro-Gly-Pro extension was added to improve metabolic stability. Its molecular formula is C37H51N9O10S and its monoisotopic mass is approximately 813.9 Da. The compound is classified as a peptide research chemical and as a registered pharmaceutical product in Russia, but it does not hold marketing approval in the European Union or the United States. Naming conventions vary across supplier catalogs.
== Further reading == Bernard, MA; Valli, VE (1977). "Familial renal disease in Samoyed dogs". The Canadian Veterinary Journal. 18 (7): 181–9. PMC 1697612. PMID 884645. Meyers, VN; Jezyk, PF; Aguirre, GD; Patterson, DF (1983). "Short-limbed dwarfism and ocular defects in the Samoyed dog". Journal of the American Veterinary Medical Association. 183 (9): 975–9. doi:10.2460/javma.1983.183.09.975. PMID 12002589. S2CID 32585084. Kimmel, SE; Ward, CR; Henthorn, PS; Hess, RS (2002). "Familial insulin-dependent diabetes mellitus in Samoyed dogs". Journal of the American Animal Hospital Association. 38 (3): 235–8. doi:10.5326/0380235. PMID 12022409.
Anchoring fibrils (composed largely of type VII collagen) extend from the basal lamina of epithelial cells and attach to the lamina reticularis (also known as the reticular lamina) by wrapping around the reticular fiber (collagen III) bundles. The basal lamina and lamina reticularis together make up the basement membrane. Anchoring fibrils are essential to the functional integrity of the dermoepidermal junction.
While some diseases like lupus exhibit familial aggregation, suggesting a genetic predisposition, other cases have been associated with infectious triggers or exposure to environmental factors, implying a complex interplay between genes and environment in their etiology. Some of the most common diseases that are generally categorized as autoimmune include coeliac disease, type 1 diabetes, Graves' disease, inflammatory bowel diseases (such as Crohn's disease and ulcerative colitis), multiple sclerosis, alopecia areata, Addison's disease, pernicious anemia, psoriasis, rheumatoid arthritis, and systemic lupus erythematosus. Diagnosing autoimmune diseases can be challenging due to their diverse presentations and the transient nature of many symptoms. Treatment modalities for autoimmune diseases vary based on the type of disease and its severity. Therapeutic approaches primarily aim to manage symptoms, reduce immune system activity, and maintain the body's ability to fight diseases. Nonsteroidal anti-inflammatory drugs (NSAIDs) and immunosuppressants are commonly used to reduce inflammation and control the overactive immune response. In certain cases, intravenous immunoglobulin may be administered to regulate the immune system. Despite these treatments often leading to symptom improvement, they usually do not offer a cure and long-term management is often required. In terms of prevalence, a UK study found that 10% of the population were affected by an autoimmune disease. Women are more commonly affected than men.
24494Pu + 4820Ca → 292114Fl* → 290114Fl + 2 10n This reaction had been tried before, without success; for this 1998 attempt, JINR had upgraded all of its equipment to detect and separate the produced atoms better and bombard the target more intensely. One atom of flerovium, alpha decaying with lifetime 30.4 s, was detected. The decay energy measured was 9.71 MeV, giving an expected half-life of 2–23 s. This observation was assigned to 289Fl and was published in January 1999. The experiment was later repeated, but an isotope with these decay properties was never observed again, so the exact identity of this activity is unknown. It may have been due to the isomer 289mFl, but because the presence of a whole series of longer-lived isomers in its decay chain would be rather doubtful, the most likely assignment of this chain is to the 2n channel leading to 290Fl and electron capture to 290Nh. This fits well with the systematics and trends of flerovium isotopes, and is consistent with the low beam energy chosen for that experiment, though further confirmation would be desirable via synthesis of 294Lv in a 248Cm(48Ca,2n) reaction, which would alpha decay to 290Fl. The RIKEN team reported possible synthesis of 294Lv and 290Fl in 2016 in a 248Cm(48Ca,2n) reaction, but the alpha decay of 294Lv was missed, alpha decay of 290Fl to 286Cn was observed instead of electron capture to 290Nh, and the assignment to 294Lv instead of 293Lv was not certain. Glenn T.
Sources: en.wikipedia.org
Kort & Ricker (2026) compare pelvic morphology of Sinopa and Thinocyon with those of extant mammals, and argue that extant carnivorans might be imperfect analogs for reconstructions of configuration of musculature and locomotor modes of hyaenodonts. Fischer et al. (2026) study the body mass evolution in European mesonychians, hyaenodonts, oxyaenodonts and carnivoramorphs during the Paleogene, reporting evidence of increase of range of body mass of members of Carnivoramorpha after the Middle Eocene Climatic Optimum (and before the establishment of carnivoran-dominated faunas related to the Grande Coupure), and interpret the replacement of hyaenodont-dominated faunas in Europe by carnivoran-dominated ones as more likely related to climate changes than caused by competition between the different group of mammalian carnivores.
Do6a is a venom peptide found in the venom of the Velvet ant (Mutillidae). It targets Pickpocket/Balboa ion channels in class IV dendritic arborizing (cIV da) neurons in larvae of fruit flies (Drosophila melanogaster). Do6a has been shown to also activate nociceptors in praying mantis (Mantodea).
Sweden: The nationalist Sweden Democrats entered the Swedish parliament for the first time in the 2010 Swedish general election. France: The far right obtained representatives in the Assembly for the first time since the 1997 election, The National Rally wins two seats in the 2012 legislative election. Germany: The Alternative for Germany (AfD), which was previously unrepresented in the Bundestag, became the third largest party in the Bundestag with 12.6% of the vote in the 2017 German federal election. It was the first time since 1957 that a party to the political right of the CDU/CSU gained seats in the Bundestag. Spain: The far-right Vox party entered Congress for the first time in 2019 Spanish general election. Vox's result signalled the first time since Blas Piñar's election as a deputy for the National Union coalition in 1979 that a far-right party had won seats in the Spanish Parliament after the country's return to democracy as well as the first time that a far-right party would be able to form a parliamentary group of its own in the Congress of Deputies. Portugal:The right-wing/far-right party CHEGA (CH) elected an MP from Lisbon in the 2019 Portuguese legislative election. It was the first time since the return to democracy 45 years that a right-wing/far-right party gained representation in Parliament.
Sources: en.wikipedia.org
The Li-ion battery recycling rate is often misconstrued to be 5%, in reality, insufficient research exists to determine the exact figure. The European Union estimates 49% of portable batteries sold were collected for recycling in 2023, whilst the UK estimates 45% as of 2026. New EU legislation requires 70% of collected Li-ion battery material to be recovered through recycling by 2031, which must include recovery rates of 80% for lithium and 95% for cobalt, nickel, and manganese; however, no recycled lithium has re-entered the EU as of 2023. These measures aim to aid sustainability efforts and reduce pressure on raw material extraction, as demand for lithium and cobalt is expected to increase 8-fold by 2040, far exceeding current production capabilities. Most research focuses on the recovery of active materials, especially lithium which is a critical raw material; however, through advanced recycling techniques and more sustainable design considerations, electrolytes, binders, and separators can also be recycled. Recycling is a multi-step process, starting with the storage of batteries before disposal, followed by manual testing, disassembling, and finally the chemical separation of battery components. Re-use of the battery is preferred over complete recycling as there is less embodied energy in the process. As these batteries are a lot more reactive than classical vehicle waste like tire rubber, there are significant risks to stockpiling used batteries.
In symbolic terms, he was seen as signifying parliamentary control over the Army. Issues of strategic policy during wartime were managed by the Northern and Southern Departments (the predecessors of today's Foreign Office and Home Office). From 1704 to 1855 the post of Secretary remained occupied by a minister of the second rank (although he was occasionally part of the Cabinet after 1794). Many of his responsibilities were transferred to the Secretary of State for War after the creation of that more senior post in 1794 (though the latter was also responsible for Britain's colonies from 1801, and renamed Secretary of State for War and the Colonies, an arrangement which only ceased with the establishment of the Colonial Office in 1854). From 1824 the British Empire (excepting India, which was administered separately by the East India Company and then the India Office) was divided by the War and Colonial Office into the following administrative departments: North America
==== Contamination of water supply ==== In 2005, the water supply to the city of Harbin in China with a population of almost nine million people, was cut off because of a major benzene exposure. Benzene leaked into the Songhua River, which supplies drinking water to the city, after an explosion at a China National Petroleum Corporation (CNPC) factory in the city of Jilin on 13 November 2005. When plastic water pipes are subject to high heat, the water may be contaminated with benzene.
==== Agriculture ==== On 3 October 2021, the 53rd anniversary of Juan Velasco's rise to power via a military coup d'état, Castillo announced the start of the Second Agrarian Reform with the aim of helping small farmers and ending abuse and inequality. This was a tacit acknowledgement of the original Agrarian Reform carried out by Velasco. Castillo stated that the Second Agrarian Reform will respect property rights and will not involve the expropriation of land. However, Castillo also stated "Let's end with the bosses and the landowners. They will no longer eat thanks to the sweat of the poor and of the peasants." Castillo signaled that he would adjust the price bands to protect domestic agriculture from subsidized foreign products. Price bands for agriculture were created in 2001 for select goods, such as "hard yellow corn, milled rice, white sugar, and whole milk powder." However, over the years the price bands became increasingly liberalized, and by 2015 the price bands became nonexistent in practice. Castillo also spoke about his plan to industrialize coca leaf production and build an airport in Pichari so that goods can go directly to the national market. In a speech before a crowd, then Prime Minister Guido Bellido threatened Congress to approve the agrarian reform. "If Congress does not approve it, let the congressmen go and let the people choose other congressmen." Afterward, the attendees shouted: "Close the Congress!" Peru's Congress has been accused of obstructionism by supporters of the Castillo Administration.
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。
Registered medical products are most often 0.1% nasal drops. Research suppliers ship lyophilized powder, usually in milligram quantities, which is dissolved before use. The active peptide is the same in both cases; presentation and excipients differ.