Everything below concerns Certificate of analysis. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2025-12-22. Numbers and descriptions here follow the published literature rather than marketing material.
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。
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。
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.
| Property | Value | Notes |
|---|---|---|
| 化学类别 | 合成七肽 | ACTH(4-10) 结构类似物 |
| 氨基酸序列 | Met-Glu-His-Phe-Pro-Gly-Pro | 单字母写作 MEHFPGP |
| 分子量 | 约 813.9 Da | 随确切形式和盐型略有变化 |
| 常见同义词 | ACTH(4-10) 类似物 | 俄语文献称 Семакс |
| 开发来源 | 俄罗斯 | 二十世纪八十年代 |
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。
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。
Stability depends heavily on physical state. Lyophilized powder held dry, cold and dark retains its content over long periods, whereas dissolved peptide begins to change within days at room temperature. The most cited degradation route is oxidation of the methionine residue, which converts the peptide to a sulfoxide form that elutes differently on chromatography. Hydrolysis of amide bonds and adsorption onto container walls contribute smaller losses. Buffers that exclude oxygen from the headspace slow the oxidation pathway, but no single condition prevents all change indefinitely.
Practical handling follows from those properties. Bulk material is best divided into single-use portions soon after receipt, because each thaw exposes the whole container to moisture and temperature cycling. Vials should be allowed to reach room temperature before opening to prevent condensation on the powder. Low-binding plasticware reduces loss of dilute solutions, and sterile filtration is used when a preparation must remain free of microbial growth. Records of batch number, reconstitution date and storage history are what allow a later analytical result to be interpreted meaningfully.
Later generations of the molecule include an N-acetylated form and an amidated form, both marketed online alongside the parent peptide. These variants differ in terminal chemistry and stability, and they are frequently discussed in the same breath even though they have not been compared in controlled trials. Supply outside formal healthcare systems comes largely from laboratories that synthesize peptides to order. Purity and identity of these materials vary widely, and no single body oversees the international trade.
Semax is a synthetic heptapeptide developed in the Soviet Union during the 1980s by researchers at the Institute of Molecular Genetics in Moscow. It was designed as a truncated analog of adrenocorticotropic hormone, retaining only the fragment spanning residues four through ten. Investigators sought a peptide that would preserve the cognitive effects associated with ACTH while eliminating the hormonal stimulation of the adrenal cortex. The compound entered clinical use in Russia during the following decade.
Russian regulatory authorities approved the peptide for nasal administration, and it remains listed in the national pharmacopoeia under several trade names. Documented indications include acute ischemic stroke, transient ischemic attacks, traumatic brain injury, and certain ophthalmological and neurological conditions. Physicians also prescribe it for cognitive complaints in older patients, although the evidence base for that use is thinner. Outside Russia and a few neighboring states, the substance is not an approved medicine and is sold instead as a research chemical.
Identity and purity are established with standard peptide methods. Reversed-phase HPLC with ultraviolet detection near 214 nm resolves the parent peak from deletion and truncation byproducts, and reports typically quote a main-peak percentage. Mass spectrometry by electrospray or MALDI-TOF confirms the expected molecular mass, while amino acid analysis or peptide mapping can verify composition when the sequence itself is in question. A certificate of analysis that pairs a chromatogram with a mass spectrum is more informative than a purity figure alone. Counter-ion content and residual solvents are separate specifications and are frequently omitted.
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.
D-dimer (or D dimer) is a dimer that is a fibrin degradation product (FDP), a small protein fragment present in the blood after a blood clot is degraded by fibrinolysis. It is so named because it contains two D fragments of the fibrin protein joined by a cross-link, hence forming a protein dimer. D-dimer concentration may be determined by a blood test to help diagnose thrombosis. Since its introduction in the 1990s, it has become an important test performed in people with suspected thrombotic disorders, such as venous thromboembolism. While a negative result practically rules out thrombosis, a positive result can indicate thrombosis but does not exclude other potential causes. Its main use, therefore, is to exclude thromboembolic disease where the probability is low. D-dimer levels are used as a predictive biomarker for the blood disorder disseminated intravascular coagulation and in the coagulation disorders associated with COVID-19 infection. A four-fold increase in the protein is an indicator of poor prognosis in people hospitalized with COVID-19.
Black Mesa is a third-party remake of the original Half-Life, developed and published by Crowbar Collective and made in the Source engine. Originally published as a free mod in September 2012, it was approved by Valve for a commercial release. It was fully released on March 6, 2020, for Windows and Linux. It was praised by reviewers, who likened it to an official Valve game. On the review aggregator OpenCritic, Black Mesa had an average 87/100 review score with 100% approval rating based on 14 reviews.
Valproate is a weak or low-potency histone deacetylase inhibitor, specifically of the class I HDAC1, HDAC2, HDAC3, and HDAC8, but not of other HDACs. Earlier studies found a wide range of inhibitory potencies of valproate against HDACs, ranging from low micromolar to millimolar concentrations, but subsequent work with improved methodology has supported greater inhibitory potencies, with IC50Tooltip half-maximal inhibitory concentration values in the range of 36 to 219 μM for the class I HDACs. For comparison, valproate was found to be 4- to 46-fold less potent in inhibiting the class I HDACs relative to butyric acid (butyrate). By inhibiting HDACs, valproate promotes more transcriptionally active chromatin structures, that is it exerts an epigenetic effect. This has been proven in mice: Valproic acid induced histone hyperacetylation had brain function effects on the next generation of mice through changes in sperm DNA methylation. Intermediate molecules include VEGF, BDNF, and GDNF.
Sources: en.wikipedia.org
Saeed Balalaie (Persian: سعید بلالایی; born 26 September 1965) is an Iranian organic chemist and professor at K. N. Toosi University of Technology. His research focuses on multicomponent reactions, peptide synthesis, and the synthesis of active pharmaceutical ingredients. Balalaie was a recipient of the 33rd Khwarizmi International Award in 2019 (announced in February 2020) for applied research and was named Iran's National Outstanding Researcher in the same year (2019). He has received multiple research fellowships from the Alexander von Humboldt Foundation and served as the foundation's Scientific Ambassador in Iran from 2015 to 2020.
Afghanistan was formerly the primary producer of the drug. Having regularly producing 70 percent of the world's opium, Afghanistan decreased production to 74 tons per year under a ban by the Taliban in 2000, a move which cut production by 94 percent. A year later, after American and British troops invaded Afghanistan, removed the Taliban and installed the interim government, the land under cultivation leapt back to 285 square miles (740 km2), with Afghanistan supplanting Burma to become the world's largest opium producer once more. Opium production increased rapidly in Afghanistan from that point, reaching an all-time high in 2006. According to DEA statistics, Afghanistan's production of oven-dried opium increased to 1,278 tons in 2002, more than doubled by 2003, and nearly doubled again during 2004. In late 2004, the U.S. government estimated that 206,000 hectares were under poppy cultivation, 4.5 percent of the country's total cropland, and produced 4,200 metric tons of opium, 76 percent of the world's supply, yielding 60 percent of Afghanistan's gross domestic product. In 2006, the UN Office on Drugs and Crime estimated production to have risen 59 percent to 165,000 hectares (407,000 acres) in cultivation, yielding 6,100 tons of opium, 82 percent of the world's supply. The value of the resulting heroin was estimated at US$3.5 billion, of which Afghan farmers were estimated to have received US$700 million in revenue. For farmers, the crop can be up to ten times more profitable than wheat. The price of opium is around US$138 per kilo.
patients with active hepatic disease patients in whom spasticity is utilized to maintain upright posture and balance patients with a hypersensitivity to dantrolene There are no contraindications for intravenous dantrolene used for prophylaxis or management of malignant hyperthermia.
Sources: en.wikipedia.org
Viral vector vaccines use a safe virus to insert pathogen genes in the body to produce specific antigens, such as surface proteins, to stimulate an immune response. Viruses being researched for use as viral vectors include adenovirus, vaccinia virus, and VSV.
=== Chinese industry === The State Council ordered the testing of product of all dairy producers, and to this end, some 5,000 inspectors were dispatched. The Chinese market has grown at an average annual rate of 23% since 2000. In 2006, milk production reached 30 million tons, ten times the volume of a decade before. It was valued at some ¥122 billion (US$18 billion) in 2007, and consumers had severely lost confidence in the industry. The events have exposed the often-incestuous relationship between local business and local government. In addition to the tax revenues to local authorities—Sanlu contributed ¥330 million in 2007, many companies invite local officials to become "silent partners" in their corporations—in return for "protection" at the political level; former Sanlu chairman Tian Wenhua was made honorary deputy to the Provincial People's Congress. The scandal has also highlighted structural problems of inadequate production volume, inherent quality issues, and poor production methods. The Inner Mongolia region produces over one-fourth of China's milk, and Mengniu and Yili have invested millions to establish state-of-the-art dairy facilities in its capital, Hohhot. The companies still rely on small-scale farmers for over 90% of their production because of the capacity constraint of the modern facilities. Both companies were said by farmers and agents to have habitually purchased milk which failed quality tests, for only two-thirds the normal price. A new policy was put in place on 17 September to stop that practice.
Baseball Digest All-Star Rookie Team (1998) Associated Press MLB All-Star Team (2000) Baseball Digest MLB Player of the Year (2000) USA Baseball Alumni Player of the Year (2000) Achievements National League (NL) Batting Champion (2000) NL slugging percentage leader (2000) NL RBI leader (2000) NL Doubles leader (2000, Helton hit 59 doubles during the season, which tied Chuck Klein for the third-highest single-season doubles total in NL history.) Hit for the cycle (June 19, 1999) Percentage triple crown (2000) NL hits leader (2000) NL on-base percentage leader (2000, 2005, 2007) NL total bases leader (2000) NL extra base hits leader (2000) Colorado Rockies career leader in games played (2,247), at bats (7,962), runs (1,401), hits (2,519), total bases (4,292), doubles (592), home runs (369), RBI (1,406), walks (1,335), and intentional walks (185). Colorado Rockies retired Helton's number 17 on August 17, 2014. Helton first appeared on the National Baseball Hall of Fame ballot in 2019, when he received 16.5% of the vote, well short of the 75% required for election, but above the 5% minimum required to remain on the ballot. On January 23, 2024, Helton was elected to the Hall of Fame, receiving 79.7% of the vote. He is the second Rockies player, after Larry Walker, to be elected. Helton was formally inducted on July 21, 2024.
Although the party's ideology has shifted throughout its existence, it has consistently presented itself through a Christian democratic and politically Catholic profile. It was seen to occupy the political centre, although the party is considered to have shifted towards the right of centre in early 1930s under the leadership of Ludwig Kaas. The Oxford Handbook of the Weimar Republic argues that while "Until recently, historians considered Kaas to have been an... ominous indication of the Centre’s shift to the right", the party's position was "more nuanced", as it continued to accept the legitimacy of the Weimar Republic and its constitution, and Kaas strove to reconcile both the left-leaning and right-leaning wings of the party. The party adopted a new program in 2008 in which it stated rejection for the traditional left and right divide of politics and called for a "value-oriented" platform guided by the principles of Christianity and Basic Law for the Federal Republic of Germany. The party supports the traditional family unit and is generally opposed to abortion. It has given support to right to life movements in Germany. During the Weimar era, the Centre Party was socially and economically heterogenous and included groups of various political views and interests, including republicans and monarchists. It represented the entire "political microcosm of Weimar Catholic society".
Sources: en.wikipedia.org
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。
Semax 被描述为 ACTH(4-10) 的结构类似物，两者共享部分序列特征。它保留了该片段的部分神经相关活性方向，但去除了完整片段带来的激素释放效应。二者并非同一物质，也不能互相替代。
加入的 Pro-Gly-Pro 三肽被普遍认为能提升分子对蛋白水解酶的稳定性。这种设计让短肽在体内维持时间更长。具体延长的程度以及不同组织中是否一致，文献中仍存在不同报告。
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.