Everything below concerns synthetic heptapeptide. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-01-25. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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。
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C37H51N9O10S | Seven-residue peptide |
| Molecular mass | 813.9 Da | Monoisotopic value |
| Appearance | White to off-white powder | Lyophilized form |
| Solubility | Freely soluble in water | Also soluble in saline and polar solvents |
| Storage (dry) | -20 °C or lower | Desiccated, protected from light |
Terminology around the compound varies by source. It appears in catalogues and papers as Semax, as the heptapeptide ACTH(4-7)-Pro-Gly-Pro, and under various alphanumeric laboratory codes used by individual suppliers. These names refer to the same sequence but may imply different salt forms, purity grades, or counter-ions. Peptide databases usually list the free base mass, while product descriptions sometimes report acetate or trifluoroacetate salts with a different formula weight. Because naming conventions for research peptides are not standardised across vendors, checking the declared sequence and measured mass is more reliable than relying on a trade name alone.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. Its design combines the ACTH(4-7) core fragment with a C-terminal Pro-Gly-Pro extension, a modification intended to improve stability and prolong activity. The molecule is hydrophilic, carries no lipid chains or glycosylation, and has a theoretical mass just over 810 daltons in its free form. All seven residues are proteinogenic amino acids, so no non-natural building blocks appear in the backbone. A free N-terminal methionine and C-terminal proline define the unmodified parent peptide.
稳定性主要由水解与氧化两条路径支配。肽键在中性或弱酸性条件下相对稳定，遇到强碱或长时间高温则明显断裂；甲硫氨酸侧链容易被氧化成亚砜，使主峰前移并拉低实际含量。金属离子、光照和反复冻融会进一步促进降解或聚集。冻干粉在低温避光条件下可存放较长时间，配制后的水溶液通常需要冷藏并尽快用完。
纯度评估以反相高效液相色谱为主，通过主峰面积百分比给出粗略结果，再配合电喷雾质谱核对分子量。氨基酸分析可验证组成比例，手性色谱或毛细管电泳用于检查残基构型。常见杂质包括缺失序列的短肽、氧化产物与二聚体。由于多数市售品不附带完整检验报告，独立第三方检测常被用来核实标称值。
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.
Published studies are dominated by animal models of stroke, ischemia, and cognitive impairment, with a smaller number of human trials conducted in Russia. Many of the human reports are small, single-center, and published in Russian-language journals, which limits independent scrutiny. Outcome measures vary between studies and often rely on clinician-rated scales rather than objective biomarkers. Systematic reviews have noted the methodological weaknesses and called for larger, preregistered trials before firm conclusions can be drawn.
Claims about enhanced focus, memory, or mood in healthy people rest mostly on anecdotal reports and community discussion rather than on controlled data. It remains unclear whether any cognitive benefit observed in patients recovering from brain injury would extend to uninjured users. Dose-response relationships, long-term safety, and interactions with other drugs are not well characterized in the peer-reviewed literature. Questions about optimal route of administration and treatment duration likewise remain open.
Semax binds to melanocortin receptors and is thought to influence neuronal survival and plasticity rather than to act through the adrenal axis. Laboratory work has shown increased expression of brain-derived neurotrophic factor and nerve growth factor in treated tissue. Changes in c-Fos, a marker of neuronal activation, have also been reported. Because the peptide is rapidly degraded by peptidases, its effects are generally attributed to downstream signaling cascades rather than to sustained receptor occupancy.
=== Wes: The Meat-Stick Bully === First aired: 24 September 2009 Victim Chris has a problem with a tobacco spittin', hockey playing Texan and self-proclaimed "meat-stick", Wes. Mayhem enlists Tony Bonello to put this bully in his place. He was submitted 4 times and knocked out, but with an illegal head kick. Wes actually managed to knock down Tony Bonello which, apparently, upset the MMA fighter enough for him to break the rules. The kick to the head was hard enough that Wes could not remember where he was, or any of the fight. Because of the illegal kick, the bully received the $5,000 for that round. However, Wes refused it, stating "A knockout's a knockout," and then apologized to Chris by giving the money to him. Mayhem refers to Chris as his favorite victim because he is cute and adorable.
The Biological Stain commission is an independent non-profit company that has been testing dyes since the early 1920s and issuing Certificates of approval for batches of dyes that meet internationally recognized standards. StainsFile Reference for dyes and staining techniques. Vital Staining for Protozoa and Related Temporary Mounting Techniques ~ Howey, 2000 Speaking of Fixation: Part 1 and Part 2 – by M. Halit Umar Photomicrographs of Histology Stains Frequently asked questions in staining exercises at Sridhar Rao P.N's home page
Following Donald Trump's victory in the 2024 U.S. presidential election, several prominent tech industry figures expressed support for positions aligned with effective accelerationism, particularly regarding deregulation and technological advancement. The potential appointment of Elon Musk to government roles focused on auditing federal programs drew support from venture capitalists who anticipated reduced regulatory oversight of the technology sector. Notable tech figures publicly connected these developments to the movement's principles. Aaron Levie, CEO of Box, expressed support for "removing unnecessary red tape and over-regulation", while Mark Pincus, early Facebook investor and Zynga founder, explicitly referenced "effective accelerationism" in his post-election commentary. Venture capitalists viewed the incoming administration as an opportunity to ease regulations that had affected technology mergers and acquisitions during the previous years.
Engrafting an immunodeficient mouse with functional human cells can be achieved by intravenous injections of human cells and tissue into the mouse, and/or creating a genetically modified mouse from human genes. These models have been instrumental in studying human diseases, immune responses, and therapeutic interventions. This section highlights the various humanized mice models developed using the different methods.
Sources: en.wikipedia.org
Religious affiliation in West Germany decreased from the 1960s onward. Religious affiliation declined faster among Protestants than among Catholics, causing the Roman Catholic Church to overtake the EKD as the largest denomination in the country during the 1970s.
==== MeSH D12.776.964.775.325 – gene products, env (gene) ==== MeSH D12.776.964.775.325.330 – hiv envelope protein gp41 MeSH D12.776.964.775.325.350 – hiv envelope protein gp120 MeSH D12.776.964.775.325.380 – hiv envelope protein gp160
The original synthesis as patented in 1964 by Paul Janssen involves the synthesis of benzylfentanyl from N-benzyl-4-piperodone. The resulting benzylfentanyl is used as feedstock to norfentanyl. It is norfentanyl that forms fentanyl upon reaction with a phenethyl halide.
== Applications == An early application of TRMS was in the observation of flash photolysis process. It took advantage of a time-of-flight mass analyzer. TRMS currently finds applications in the monitoring of organic reactions, formation of reactive intermediates, enzyme-catalyzed reactions, convection, protein folding, extraction, and other chemical and physical processes.
=== Availability === Cyproheptadine is available widely throughout the world. This includes in Australia, Canada, Europe, Hong Kong, India, Japan, Mexico, Turkey, the United Kingdom, and the United States, among others.
Sources: en.wikipedia.org
14 November Archaeologists report the oldest likely evidence (via heated fish teeth from a deep cave) of controlled use of fire to cook food by archaic humans ~780,000 years ago. After being linked to risks for obesity, mental disorders, and potentially other health issues, a study finds a likely association between (contemporary types of) outdoor artificial light at night and diabetes. 15 November A scientific review finds that human sperm counts fell by 62% in the last 50 years and are decreasing at an accelerating rate, likely a result of factors such as poor diets, endocrine disruptors in prevalent products, unhealthy lifestyles and toxic forever chemicals in air and water. A study using neuroimaging identifies rapid GABA boosting as a major potential explanation-component for why learning is often more efficient in children. Scientists report leprosy-causing bacteria viably regenerate and rejuvenate the liver in its armadillos hosts, which may enable novel human therapies. 16 November NASA conducts the first uncrewed flight of its Space Launch System (SLS), the largest rocket in history. The onboard Orion capsule will orbit the Moon before returning to Earth, as a demonstration of planned human missions. A satellite-free GPS-alternative higher-resolution positioning system using existing telecommunications networks is demonstrated, SuperGPS.
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An X-ray room must be shielded on all sides with 1 mm lead equivalent shielding. Calcium silicate or solid brick masonry is recommended. A steel jamb should be used, not only because of the weight of the heavy shielding door but also because of the shielding; wooden frames must be shielded separately. The shielding door must be covered with a 1 mm thick lead foil and a lead glass window must be installed as a visual connection. A keyhole shall be avoided. All installations (sanitary or electrical), that interrupt the radiation protection, must be leaded ( § 20 § 20 Röntgenverordnung (röv_1987) [§ 20 X-ray Ordinance] (in German) and § Annex+2 Annex 2 (to § 8 para. 1 sentence 1 RöV) (röv_1987) (in German) Depending on the application, nuclear medicine requires even more extensive protective measures, up to and including concrete walls several meters thick. In addition, from December 31, 2018, when the latest amendments to Section 14 (1) No. 2b of the Radiation Protection Act § 14 Strahlenschutzgesetz – StrlSchG [Radiation Protection Act (StrlSchG)] (in German) come into force, an expert in medical physics for X-ray diagnostics and therapy must be consulted for the optimization and quality assurance of the application and for advice on radiation protection issues.
Forskolin Interleukin-6 Pituitary adenylate cyclase-activating peptide (PACAP) Stress or trauma Circadian rhythms Forskolin and PACAP regulate the synthesis of CRH in the hypothalamus by binding to G protein-coupled receptors and stimulating and increase in cAMP within the cells via the action of adenylate cyclase. This activates the protein kinase A pathway, which results in the binding of cAMP response element binding protein (CREB) onto the CRH promoter region and induces transcription of CRH. This process is repressed by glucocorticoids; this inhibitory feedback helps maintain homeostasis of the stress response. Once released by the hypothalamus, CRH travels through the hypophyseal portal system to the anterior pituitary, where it binds to G protein-coupled receptors on the corticotropic cell membrane and stimulates cAMP production. The effects of CRH on pituitary corticotropes are potentiated by vasopressin (AVP); AVP is a weak inducer of ACTH production on its own, but has a strong synergistic effect on ACTH production when CRH is also bound to the receptor. These signaling hormones act via signal transduction, causing the synthesis of POMC and eventual cleavage to ACTH and β-lipotropin. These peptide hormones are then released into the bloodstream, where they circulate and act on target tissues.
Sources: en.wikipedia.org
It is a synthetic peptide of seven amino acids. Its backbone corresponds to a fragment of adrenocorticotropic hormone extended at the carboxyl end. The material is distributed as a lyophilized solid for laboratory use.
The extension was introduced to slow enzymatic breakdown of the peptide in biological systems. Natural ACTH fragments are degraded rapidly by peptidases. Adding the tripeptide was intended to extend the window during which the molecule remains intact.
Most published work consists of animal experiments conducted in a small number of laboratories. Human data are limited in number and size. Whether the observed effects translate into reliable clinical benefit is still unresolved.
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。