The short version of ACTH fragment fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2025-12-26 and is reviewed periodically as new material appears.
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.
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.
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。
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。
| 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.
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.
In the United States, oxandrolone was categorized as a Schedule III controlled substance under the Controlled Substances Act along with many other AASs. In 2017, it was a Schedule IV controlled substance in Canada, and a Schedule 4 controlled drug in the United Kingdom.
=== Scraped surface generators === The world’s first patent for a slurry ice generator was filed by Sunwell Technologies Inc. of Canada in 1976. Sunwell Technologies Inc. introduced slurry ice under the trade name deepchill ice, in the late 1970s. Slurry ice is created through a process of forming spherical ice crystals within a liquid. The slurry ice generator is a scraped-surface vertical shell and tube heat exchanger. It consists of concentric tubes with refrigerant flowing between them and the water/freezing point depressant solution in the inner tube. The inner surface of the inner tube is wiped using a mechanism which in the original Sunwell design consists of a central shaft, spring-loaded plastic blades, bearings, and seals. The small ice crystals formed in the solution near the tube surface are wiped away from the surface and mixed with unfrozen water, forming the slurry. Other slurry ice generators adapted the first idea of wiping the surface using an auger originally designed to create flake ice. Wipers also can be brushes or fluidized bed heat exchangers for ice crystallization. In these heat exchangers, steel particles circulate with the fluid, mechanically removing the crystals from the surface. At the outlet, steel particles and slurry ice are separated.
=== Relative humidity and temperature === Inconsistent relative humidity and temperature provide the perfect environment for mold and fungi growth on waterlogged wood. Growth of mold or other bacteria requires immediate attention to control damage. Natural cellulosic materials are the best environment for mold spores to grow and mature. "Mold is a microorganism that produces enzymes that convert the cellulose in fibers to soluble sugar that is metabolized as food. Proteins are generally less susceptible, but keratinophilic fungi will feed on, and damage, these fibers as well". Similar to wood found in nature, mold and other feeding organisms are attracted to the material, this includes pests and naturally occurring fungi and bacteria. Mold is a high risk for waterlogged wood even with controlled relative humidity and temperature due to the resilient nature of the organisms and the perfect environment waterlogged wood provides as a food source to the growth of spores.
Like with whole pancreas transplantation, islet transplantation requires lifelong immunosuppression and depends on the limited supply of donor organs; it is therefore similarly limited to people with severe poorly controlled diabetes and those who have had or are scheduled for a kidney transplant. A novel approach by Sana Biotechnology is hypo-immune donor-derived islets, which are genetically engineered (B2M−/−, CIITA−/−, CD47+) to be invisible to the immune system, thereby eliminating the need for immunosuppressants. Cadaveric donor islets are dispersed, and CRISPR/Cas 9 is used to disrupt the B2M and CIITA genes, and CD47 transduction is performed using a Lentiviral Vector (LVV). The successfully engineered islet cells are then reclustered to form pseudoislets. In 2025, the first person with T1D was reported to receive a successful transplant of hypoimmune islets. The islets produced insulin without the patient's need to take immunosuppressants. Donislecel (Lantidra) allogeneic (donor) pancreatic islet cellular therapy was approved for medical use in the United States in June 2023.
== Guest appearances == Several celebrities or future celebrities made uncredited appearances, either as part of the main storyline or in brief segments; among these were Richard Sanders who later gained fame playing Les Nessman on WKRP in Cincinnati. Ordinary citizens were interviewed by the kids in selected segments of some episodes in a "man on the street" format.
Sources: en.wikipedia.org
Globally, about 2 percent of soybean meal is used for soy flour and other products for human consumption. Soy flour is used to make some soy milks and textured vegetable protein products, and is marketed as full-fat, low-fat, defatted, and lecithinated types.
== Release == The third season of The Boys premiered its first three episodes on June 3, 2022, while the rest of the episodes were released on a weekly basis up until the season finale on July 8. Due to the graphic imagery of an orgy that was expected for the episode, the season's sixth episode "Herogasm" includes a warning sign on a trailer that was released on Twitter that reads: "This episode depicts a massive supe orgy, airborne penetration, dildo-based maiming, extra strength lube, icicle phalluses and cursing. It's not suitable for any audience."
== Awareness == World Edible Insect Day, held on 23 October, was introduced by Belgian entrepreneur Chris Derudder in 2015 to raise awareness globally for the consumption of edible insects, with a focus on Europe, North America, and Australia.
blot Any of a variety of molecular biology methods by which electrophoretically or chromatographically separated DNA, RNA, or protein samples are transferred from a support medium such as a polyacrylamide or agarose gel onto an immobilizing carrier such as a nitrocellulose or PVDF membrane. Some methods involve the transfer of molecules by capillary action (e.g. Southern and northern blotting), while others rely on the transport of charged molecules by electrophoresis (e.g. western blotting). The transferred molecules are then visualized by colorant staining, by autoradiography, or by probing for specific sequences or epitopes with hybridization probes or antibodies conjugated to chemiluminescent reporters.
Sources: en.wikipedia.org
Bariatric surgery Cardiovascular surgery – may also be pursued through a separate cardiovascular surgery residency track Colorectal surgery Endocrine surgery General surgery Hand surgery Hepato-pancreato-biliary surgery Minimally invasive surgery Pediatric surgery Plastic surgery – may also be pursued through a separate plastic surgery residency track Surgical critical care Surgical oncology Transplant surgery Trauma surgery Vascular surgery – may also be pursued through a separate vascular surgery residency track Other surgical specialties within medicine with their own individual residency training:
Organic synthesis is a special type of chemical synthesis dealing with the synthesis of organic compounds. For the total synthesis of a complex product, multiple procedures in sequence may be required to synthesize the product of interest, needing a lot of time. A purely synthetic chemical synthesis begins with basic lab compounds. A semisynthetic process starts with natural products from plants or animals and then modifies them into new compounds.
=== Pharmacokinetics === Vilazodone is best absorbed with food and has a bioavailability of 72% under fed conditions. The Cmax increased between 147 and 160% and the AUC increased between 64 and 85% of vilazodone when it was administered with either a fatty or light meal.
=== Peptide masking === Similar to the idea of pro-drugs, another way of masking the drugs chemical composition is by masking a peptide's characteristics by combining with other molecular groups that are more likely to pass through the blood–brain barrier. An example of this is using a cholesteryl molecule instead of cholesterol that serves to conceal the water soluble characteristics of the drug. This type of masking as well as aiding in traversing the blood–brain barrier. It also can work to mask the drug peptide from peptide-degrading enzymes in the brain Also a "targetor" molecule could be attached to the drug that helps it pass through the barrier and then once inside the brain, is degraded in such a way that the drug cannot pass back through the brain. Once the drug cannot pass back through the barrier the drug can be concentrated and made effective for therapeutic use. However drawbacks to this exist as well. Once the drug is in the brain there is a point where it needs to be degraded to prevent overdose to the brain tissue. Also if the drug cannot pass back through the blood–brain barrier, it compounds the issues of dosage and intense monitoring would be required. For this to be effective there must be a mechanism for the removal of the active form of the drug from the brain tissue.
=== Predisposing conditions === While most cases of NAION have no known cause, it has been frequently linked to certain conditions. These include general surgical procedures, cataract surgery, hemorrhagic shock, certain medications, and optic disc drusen. The exact mechanism of optic nerve ischemia in these cases remains unclear, but contributing factors may include hypotension, anemia, hypoxia, and changes in the autoregulation of optic nerve arterial blood flow. The incidence of ischemic optic neuropathy leading to vision loss following general surgeries ranges between 0.1% and 0.002%.
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。