If you have been reading about heptapeptide and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2026-05-25. Where a claim depends on a specific study, the study is described rather than over-claimed.
Reported pharmacological work centers on neurotrophic signaling, including changes in BDNF and NGF expression in hippocampal tissue in animal models. Human data come largely from studies conducted in Russia, and how well those results generalize to other populations remains an open question. Regulatory status differs sharply by jurisdiction: Semax is a registered prescription medicine in Russia, while it holds no approved marketing status in the United States or the European Union. Outside such jurisdictions it is generally handled as a research chemical, which affects both documentation and quality expectations.
Semax is a synthetic heptapeptide whose sequence is Met-Glu-His-Phe-Pro-Gly-Pro. It was developed as a fragment analog of adrenocorticotropic hormone, modeled specifically on the ACTH(4-10) region. The first four residues reproduce that fragment, while a Pro-Gly-Pro tripeptide is appended at the C-terminus. Work on the compound originated in Russia, where it entered clinical use as an intranasal preparation. Its sequence places it among short regulatory peptides studied for effects on the central nervous system rather than on the adrenal axis.
The C-terminal Pro-Gly-Pro extension is not incidental. Proline-rich tails are known to resist several common peptidases, and the published literature attributes the longer half-life of Semax, relative to unmodified ACTH fragments, to this feature. The modification also removes the melanocyte-stimulating and corticosteroidogenic activity that characterizes longer ACTH-derived sequences. Because the molecule is small and hydrophilic, it is typically formulated as an aqueous solution for intranasal or parenteral delivery. Acetylation or amidation at the termini appears in closely related research peptides and shifts the mass by a fixed increment.
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。
| Property | Value | Notes |
|---|---|---|
| Molecular weight | ~813.9 Da (free heptapeptide) | N-acetylated form is about 42 Da heavier |
| Residue count | 7 (heptapeptide) | Four residues from ACTH(4-10), three added |
| Appearance | White to off-white powder | Usually supplied lyophilized |
| Solubility class | Freely soluble in water | Also dissolves in DMSO and polar organic solvents |
| Related parent fragment | ACTH(4-10) | Parent motif is Met-Glu-His-Phe |
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.
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.
Semax is a synthetic peptide created in the Soviet Union during the early 1980s by researchers working in Moscow. It was built from the short adrenocorticotropic hormone fragment known as ACTH(4-10), and the chain was then extended with three additional amino acids. The resulting molecule was named semax and entered clinical use in Russia in 1994. It is generally described as a nootropic and neuroprotective agent rather than as a hormone analogue.
Colombia is divided into 32 departments and one capital district, which is treated as a department (Bogotá also serves as the capital of the department of Cundinamarca). Departments are subdivided into municipalities, each of which is assigned a municipal seat, and municipalities are in turn subdivided into corregimientos in rural areas and into comunas in urban areas. Each department has a local government with a governor and assembly directly elected to four-year terms, and each municipality is headed by a mayor and council. There is a popularly elected local administrative board in each of the corregimientos or comunas. In addition to the capital, four other cities have been designated districts (in effect special municipalities), on the basis of special distinguishing features. These are Barranquilla, Cartagena, Santa Marta and Buenaventura. Some departments have local administrative subdivisions, where towns have a large concentration of population and municipalities are near each other (for example, in Antioquia and Cundinamarca). Where departments have a low population (for example Amazonas, Vaupés and Vichada), special administrative divisions are employed, such as "department corregimientos", which are a hybrid of a municipality and a corregimiento. Click on a department on the map below to go to its article.
=== Bacillus === Many proteolipids are produced by the Bacillus subtilis family, and are composed of a cyclic structure made up of 7–10 amino acids, and a β-hydroxy fatty acid chain of varying length ranging from 13 to 19 carbon atoms. These can be divided into three families depending on the structure of the cyclic peptide sequence: surfactins, iturins, and fengycins. Lipidated peptides produced by Bacillus strains have many useful bio-activities such as anti-bacterial, anti-viral, anti-fungal, and anti-tumour properties, making them very attractive for use in a wide range of industries.
=== High Point Media === After Phillips sold his majority interest in EAS, he concentrated on his writing and on promotion of his books through his publishing company, High Point Media, as well as Value Creation, a branch of EAS. Body for Life hit bookstores in 1999, and by 2003 it had sold 3.5 million copies in 24 languages. The book topped the charts in 11 different countries-including the United States, England, Japan, Australia, Greece and Finland. In 2004 USA Today named it among the Top 15 bestselling books of the past decade. In November 2003, Eating for Life: Your Guide to Great Health, Fat Loss and Increased Energy! was released. In the book Phillips offers his plan "to help inspire and guide even more people to improve their health and lift their quality of life to new heights." In February 2006, Phillips announced his "Great American Transformation Experience" (GATE) with a goal to transform America's fitness from world's worst to first within 10 years. On June 21, 2010, Phillips' latest book, Transformation: The Mindset You Need. The Body You Want. The Life You Deserve was released. A companion website, Transformation.com, that walks individuals through the transformation process was also updated. The site features a community dedicated to supporting its members' personal goals. On July 10, 2010, the book made the New York Times Best Seller list.
The final stage of completely free movement of capital was thought to require a single currency and monetary policy, eliminating the transaction costs and fluctuations of currency exchange between member states but not between member states and third countries (TFEU article 63). Following a Report of the Delors Commission in 1988, the Treaty of Maastricht made economic and monetary union an objective, first by completing the internal market, second by creating a European System of Central Banks to coordinate common monetary policy, and third by locking exchange rates and introducing a single currency, the euro. Today, 19 member states have adopted the euro, while 9 member states have either determined to opt-out or their accession has been delayed, particularly since the European debt crisis. According to TFEU articles 119 and 127, the objective of the European Central Bank and other central banks ought to be price stability. This has been criticised for apparently being superior to the objective of full employment in the Treaty on European Union article 3.
Although creatinine is eliminated more slowly than iohexol, it can be determined immediately in many veterinary practices photometric even without the involvement of a specialized laboratory. In advanced kidney disease, the blood count shows a decrease in the number of red blood cells and thus the hematocrit without a change in the blood pigment load and the cell sizes of the red blood cells and without signs of new blood cell formation (normochromic, normocytic, aregenerative anemia).
Sources: en.wikipedia.org
== Antibiofilm properties == Cecropin A can destroy planktonic and sessile biofilm-forming uropathogenic E. coli (UPEC) cells, either alone or when combined with the antibiotic nalidixic acid, synergistically clearing infection in vivo (in the insect host Galleria mellonella) without off-target cytotoxicity. The multi-target mechanism of action involves outer membrane permeabilization followed by biofilm disruption triggered by the inhibition of efflux pump activity and interactions with extracellular and intracellular nucleic acids.
=== Expression in bacterial hosts === There currently are very few effective methods for expressing functional plant Rubisco in bacterial hosts for genetic manipulation studies. This is largely due to Rubisco's requirement of complex cellular machinery for its biogenesis and metabolic maintenance including the nuclear-encoded RbcS subunits, which are typically imported into chloroplasts as unfolded proteins. Furthermore, sufficient expression and interaction with Rubisco activase are major challenges as well. One successful method for expression of Rubisco in E. coli involves the co-expression of multiple chloroplast chaperones, though this has only been shown for Arabidopsis thaliana Rubisco.
Several artificial nucleobases have been synthesized, and successfully incorporated in the eight-base DNA analogue named Hachimoji DNA. Dubbed S, B, P, and Z, these artificial bases are capable of bonding with each other in a predictable way (S–B and P–Z), maintain the double helix structure of DNA, and be transcribed to RNA. Their existence could be seen as an indication that there is nothing special about the four natural nucleobases that evolved on Earth. On the other hand, DNA is tightly related to RNA which does not only act as a transcript of DNA but also performs as molecular machines many tasks in cells. For this purpose it has to fold into a structure. It has been shown that to allow to create all possible structures at least four bases are required for the corresponding RNA, while a higher number is also possible but this would be against the natural principle of least effort.
Sugiol is a phenolic abietane derivative of ferruginol and can be used as a biomarker for specific families of conifers. The presence of sugiol can be used to identify the Cupressaceae s.1., podocarpaceae, and Araucaraiaceae families of conifers. The polar terpenoids are among the most resistant molecules to degradation besides n-alkanes and fatty acids, affording them high viability as biomarkers due to their longevity in the sedimentary record. Significant amounts of sugiol has been detected in fossil wood dated to the Eocene and Miocene periods, as well as a sample of Protopodocarpoxylon dated to the middle Jurassic.
Sources: en.wikipedia.org
== Side effects == Common side effects are peeling, itching, redness, dryness, burning, and dermatitis. Benzoyl peroxide bleaches hair, clothes, towels, bedclothing, and the like. Prolonged exposure to natural or artificial sun light (UV rays) is not recommended because the gel may cause photosensitivity. Irritation due to benzoyl peroxide can be reduced by avoiding harsh facial cleansers and wearing sunscreen prior to sun exposure. Clinical studies have shown systemic absorption of clindamycin through topical application, in some cases leading to diarrhea, bloody diarrhea, and colitis. Reports of anaphylaxis were also seen. However, the sources of these reports were personal accounts without controls and of an unknown population, thus it is difficult to attribute their cause to the clindamycin/benzoyl peroxide gel.
Senator, I am not now, nor have I ever been, an oil trader—and neither has anyone on my behalf. I have never seen a barrel of oil, owned one, bought one, sold one—and neither has anyone on my behalf. Now I know that standards have slipped in the last few years in Washington, but for a lawyer you are remarkably cavalier with any idea of justice. I am here today but last week you already found me guilty. You traduced my name around the world without ever having asked me a single question, without ever having contacted me, without ever having written to me or telephoned me, without any attempt to contact me whatsoever, and you call that justice. Galloway countered the charges by claiming they were politically motivated and a "smokescreen". He accused Coleman and other pro-war politicians of covering up the "theft of billions of dollars of Iraq's wealth". He claimed this happened "on your watch" under the post-invasion Coalition Provisional Authority, and was committed by "Halliburton and other American corporations ... with the connivance of your own government".
=== Quantification === The digested fragments are then separated by polyacrylamide gel electrophoresis with the expected appearance of bands corresponding to a single large undigested fragment, and multiple smaller bands corresponding to digested fragments. Quantitative amount of DNA in these bands can be determined with a device such as a phosphoimager, after which the methylation percentage of the original sample can be calculated by:
== Treatment == Treatment for LNS is symptomatic. Gout can be treated with allopurinol to control excessive amounts of uric acid. Kidney stones may be treated with lithotripsy, a technique for breaking up kidney stones using shock waves or laser beams. There is no standard treatment for the neurological symptoms of LNS. Some may be relieved with the drugs carbidopa/levodopa, diazepam, phenobarbital, or haloperidol. It is essential that the overproduction of uric acid be controlled in order to reduce the risk of nephropathy, nephrolithiasis, and gouty arthritis. The drug allopurinol is utilized to stop the conversion of oxypurines into uric acid, and prevent the development of subsequent arthritic tophi (produced after having chronic gout), kidney stones, and nephropathy, the resulting kidney disease. Allopurinol is taken orally, at a typical dose of 3–20 mg/kg per day. The dose is then adjusted to bring the uric acid level down into the normal range (<3 mg/dL). Most affected individuals can be treated with allopurinol all through life. No medication is effective in controlling the extrapyramidal motor features of the disease. Spasticity, however, can be reduced by the administration of baclofen or benzodiazepines. There has previously been no effective method of treatment for the neurobehavioral aspects of the disease. Even children treated from birth with allopurinol develop behavioral and neurologic problems, despite never having had high serum concentrations of uric acid.
Four dead bodies were also recovered from Bannu whereas two people were injured in a drone and a bridge was destroyed by insurgentsin Miryan Tehsil of Bannu. An MBIED attack took place in Quetta with no casualties. TTP killed an FC soldier in Wara Mamund while another soldier was killed and several injured in a TTP attack on a military camp in Shakai area of South Waziristan. An insurgent vehicle was destroyed by a drone strike in Wana Tehsil. TTP issued warnings to the public, Police and tribal elders in Tank District in a video message warning against participation in military operations and also destroyed the Outar police checkpost there with explosives. On 18 July, a premature IED detonation led to the death of five TTP militants in the Nakhtar area of Wara Mamund Tehsil while another was killed in Wana Tehsil in a foiled VBIED attack. A TTP attack on Khazina Banda post in Hangu District wounded an Elite Force Personnel. CTD conducted an operation in Koraai area of Dera Ismail Khan District killing a TTP militant. On 19 July, heavy skirmishes took place between Afghan and Pakistani forces in Kurram District following an attack on Pakistani positions by the Taliban, Pakistani forces then launched a counteroffensive forcing Taliban to abandon multiple posts at the border. An FC soldier was killed in an IMP sniper attack on Tor Chapar post in Tirah while several civilians were injured in a drone strike in Dabori Ganda Mela area of Tirah.
Sources: en.wikipedia.org
The sequence is Met-Glu-His-Phe-Pro-Gly-Pro, a seven-residue peptide. The first four residues correspond to the ACTH(4-10) fragment, and Pro-Gly-Pro is added at the C-terminus. N-acetylated versions also appear in the literature and differ in mass.
Semax is a synthetic analog of the ACTH(4-10) fragment rather than a copy of the full hormone. Truncation plus the added tail removes the steroidogenic portion of ACTH. That distinction explains why it is studied for nervous-system effects instead of adrenal stimulation.
It is registered as a prescription product in Russia and has been used there clinically, chiefly by the intranasal route. No approval exists in the United States or the European Union. Availability elsewhere typically falls under research-chemical distribution, with varying purity documentation.
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。