Certificate of analysis raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2026-02-02. Anything still debated is marked as such rather than presented as settled.
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。
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。
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.
| Property | Value | Notes |
|---|---|---|
| 结构类别 | 线性合成七肽 | 无环化结构，不含二硫键 |
| 氨基酸序列 | Met-Glu-His-Phe-Pro-Gly-Pro | N 端为甲硫氨酸 |
| 分子量 | 约 814 Da | 游离碱形式的计算值 |
| 外观 | 白色至类白色粉末 | 具吸湿性 |
| 溶解性 | 易溶于水 | 亦可溶于甲醇等极性溶剂 |
Semax 是一种人工合成的七肽，氨基酸序列为 Met-Glu-His-Phe-Pro-Gly-Pro，单字母缩写记作 MEHFPGP。它被归类为促肾上腺皮质激素片段 ACTH(4-10) 的结构类似物，但并不天然存在于生物体内。母体片段 ACTH(4-10) 的序列为 Met-Glu-His-Phe-Arg-Trp-Gly，Semax 替换了中间两个残基，并在羧基端延长了 Pro-Gly-Pro 三肽。这种延长被普遍认为能提升分子对肽酶的耐受性。
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。
The mechanisms attributed to semax are inferred from animal and cell studies rather than traced to one confirmed target. The most frequently cited pathway involves increased expression of brain-derived neurotrophic factor and nerve growth factor in hippocampal and cortical tissue. Some work points to engagement of melanocortin receptors, particularly MC4, which the parent ACTH fragment can activate. Effects on dopaminergic and serotonergic signalling have also been reported. No single account explains all observed results, and the relative weight of each pathway remains unsettled.
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.
Clinical reports describe use in ischaemic stroke, transient ischaemic attack, optic nerve conditions, and cognitive complaints, but most of these studies are small and were conducted in a single region. Systematic reviews have generally described the evidence base as limited in size and variable in methodological quality. Randomised controlled data suitable for international regulatory assessment are scarce. As a result, major treatment guidelines outside Russia do not include the peptide, and interest in it remains largely research-driven rather than routine clinical.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It is described in the literature as an analogue of the ACTH(4–10) fragment, a short N-terminal portion of adrenocorticotropic hormone that retains some neurotropic activity without the full hormonal effects of the parent peptide. The molecule carries a methionine residue at the N-terminus and two proline residues near the C-terminus, features that shape both its interactions with receptor systems and its chemical stability. The free peptide corresponds to the formula C37H51N9O10S and a molecular mass near 813.9 Da.
=== Belarus === The 2010 Belarusian protests were mass protest actions in Belarus against the results of the 2010 Belarusian presidential election, which took place on December 19, 2010, and were brutally dispersed. Between 10,000 and 60,000 people took part in the protest on October Square and Independence Square in Minsk. These were followed by the 2011 Belarusian protests. The 2017 Belarusian protests also followed later.
== Early life == Shapiro was born in Springfield, Massachusetts in 1965, and later moved to Seattle, where he worked for many years in the 1980s and '90s. In 1987, Shapiro helped launch the Annex Theatre in Seattle and performed in many of their productions. In the 1990s, he also did some acting work for Microsoft, including as the voice of McZee in 3D Movie Maker in 1995, and as the host of the MSN Preview in 1996. Shapiro moved to Brooklyn, New York in 2000.
=== Pars nervosa === Also called the neural lobe or posterior lobe, this region constitutes the majority of the posterior pituitary and is the storage site of oxytocin and vasopressin. Sometimes (incorrectly) considered synonymous with the posterior pituitary, the pars nervosa includes Herring bodies and pituicytes.
Sources: en.wikipedia.org
The French tried to reach Kaluga and swing through southern Russia, where they could find food and forage supplies. In the Battle of Maloyaroslavets, the replenished Russian army blocked the road to Kaluga. While an indecisive engagement, it nevertheless doomed the Grande Armée; with the Russians refusing to be dislodged, Napoleon was forced to retreat back down the Smolensk road along which he had already advanced, and which had already been denuded of supplies—most crucially, food. The French supply chain, already in tatters from the attrition of wagons and horses, began to collapse completely. The lack of horses also rendered Napoleon's cavalry ineffective, leaving the Grande Armée vulnerable to sustained guerrilla warfare by Russian peasants and irregular troops. The Grande Armée was dealt a further catastrophic blow by the onset of the Russian Winter, which the underfed and undersupplied Grande Armée was unprepared to cope with. When the remnants of Napoleon's army struggled across the Berezina River in November with the Russian army in pursuit, only 27,000 fit soldiers survived, with 380,000 men dead or missing and 100,000 captured. Napoleon then left his men and returned to Paris to prepare the defence against the advancing Russians. The campaign had effectively ended on 14 December 1812, when the last enemy troops left Russia. The Russians had lost around 210,000 men, but with their shorter supply lines, they soon replenished their armies. For every six soldiers of the Grande Armée that entered Russia, only one would make it out in fighting condition.
Cardiomyocites sheets have also been successfully implanted with an observed contractile function as a result of inter-cellular communication between the host and graft. However, from a practical point of view, such approach lacks of translational character as all studies share the lack of reproducibility, i.e. a construct of similar characteristics of the native tissue does not guarantee the same results. Another approach resides in the use of hydrogels. Natural hydrogels such as Matrigel, collagen and fibrin have been used as entrapment matrices, wherein the cells to be injected are embedded. However the associated high pressure of injection is associated with a high mortality rate for the cells thereby negatively impacting the benefit ratio of this approach. Furthermore, from a technical point of view, due to the polydispersity of these natural hydrogels, purification is a requisite but very difficult step. Synthetic hydrogels, such as polyethylene glycol, polylactic acid, polylactic acid-co-glycolic acid, polycaprolactone, polyacrylamide and polyurethane have been proposed. Metalloproteinase-sensitive polyethylene is of particular interest. Indeed, this polymer modulates its mechanical and biophysical properties accordingly to enzymatic activities associated with cardiomyogenic differentiation of implanted cells. To date, no hydrogel matrix is FDA-approved for stem cell therapy use despite a large number of biomaterials currently commercially available.
=== NICE === The UK's National Institute for Health and Care Excellence (NICE) can pay from £100,000 to £300,000 per QALY (Quality Adjusted Life Year) for treatments of "very rare conditions". This is compared to under £20,000 for non-orphan drugs. In 2015, NICE held consultations with "patient groups, the Department of Health, companies, learned societies, charities and researchers" regarding the appraisal of medicines and other technologies. There was a call for more research into new processes, including:
Sources: en.wikipedia.org
On June 11, 2013, just days after being robbed at gunpoint in San Francisco, rapper 2 Chainz was arrested at Los Angeles International Airport on charges of possessing promethazine and codeine syrup (the primary ingredient of lean) along with marijuana. Mac Miller, who died of a drug overdose not involving lean, spoke openly of his addiction to lean. On April 7, 2015, Swedish rapper Yung Lean, while living in Miami Beach, Florida, and recording his second studio album Warlord, was hospitalized at Mount Sinai Medical Center due to an overdose stemming from an addiction to Xanax, cocaine, and lean. On November 26, 2024, rapper Lil Shine was charged with attempting to acquire controlled substances, after he and two others were accused of hacking into the Drug Enforcement Administration’s physicians system to acquire large amount of promethazine and codeine (the main ingredients in lean) with the intent to sell them.
=== Film formation === In the coatings and adhesives industry, drying is used to cure solvent-based films. In some cases, highly structured films can result. For example, evaporation of solvent from a solution containing helical polymer results in a highly ordered array of squashed toroidal structures.
Later, in the 1970s, there was a high possibility of conflict between Chile and Peru, between Chile and Argentina, and between Peru and Ecuador, which were feared that they would become entangled in a war on a continental scale. During the government of the dictator Augusto Pinochet, there were tensions between the two countries, due not only to the geopolitical rivalry in the South Pacific and the nationalist sentiments of both countries, but also due to certain ideological differences between the right-wing Pinochet regime and the leftist regime of the Peruvian dictator, Juan Velasco Alvarado, in the framework of the Cold War, to whom the Chilean military leadership attributed a determined military will to recover the provinces of Arica and Tarapacá before the centenary of the War of the Pacific, even before the Coup de State against Allende. There is a record of at least 2 occasions in which Pinochet came to seriously consider the idea of starting a preventive war against Peru. In 1974, Pinochet summoned the General Staff of the National Defense of Chile to analyze the possibility of attempting a massive military attack on Peru (preventing the Peruvians from attacking first), however, he only obtained the support of the Army, but not that of the Navy or Air Force, whose officers feared the Peruvian military superiority of back then.
Sources: en.wikipedia.org
不存在。它是依据 ACTH 的一段序列人工设计的分子，天然蛋白质中找不到与之完全相同的七肽。名称属于研究代号，而非天然物质名。
Semax 对应 ACTH 第 4 至第 10 位的片段，并在两端做了替换与延长，使其不再具备促肾上腺皮质激素的典型内分泌活性。这一改动同时改变了它在体内的稳定性与分布特征。
俄罗斯将其列为处方药物，需要医生开具处方。多数其他国家把它当作研究化合物，不能作为药品销售或宣称疗效。具体合法性取决于当地法规。
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.