If you have been reading about ACTH analog 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 2026-08-01. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
Circulation time for the peptide is short because peptidases cleave it readily. The Pro-Gly-Pro tail is thought to slow breakdown compared with the bare ACTH fragment, but the gain appears modest. Absorption after intranasal dosing is limited, and only a fraction of a dose is expected to reach the central nervous system. Laboratory concentrations therefore sit well above levels achieved systemically, a gap that complicates translation from bench findings to clinical claims.
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.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It corresponds to the ACTH(4-7) fragment extended at the C-terminus by a Pro-Gly-Pro tripeptide, an addition intended to slow enzymatic breakdown. The molecular formula is C37H51N9O10S and the molecular mass is approximately 814 daltons. In the literature it is often described as an ACTH(4-10) analog, although that label reflects a naming convention as much as a precise structural relationship. The compound was developed in Russia and remains most closely associated with that research tradition.
Laboratory descriptions of the material are consistent across suppliers. It appears as a white to off-white lyophilized powder that dissolves readily in water and in polar organic solvents such as dimethyl sulfoxide. Aqueous solutions are clear and colorless at low concentrations. Because the peptide contains methionine, oxidation at the sulfur atom is a recognized degradation pathway, and handling notes usually call for protected, desiccated storage. Reported purity for research-grade lots is generally above 95 percent as measured by reversed-phase high-performance liquid chromatography.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Lyophilized solid from research suppliers |
| Solubility | Freely soluble in water | Also dissolves in aqueous buffers; solutions are used fresh |
| Typical storage temperature | -20 °C for lyophilized powder | Short-term transport at 2-8 °C is common |
| Common analytical method | Reverse-phase HPLC | Paired with mass spectrometry for identity confirmation |
| Common synonyms | ACTH(4-10) analogue; MEHFPGP | N-terminal methionine retained in the chain |
Routine characterization relies on reversed-phase high-performance liquid chromatography to establish purity and on mass spectrometry to confirm molecular identity. Electrospray ionization and matrix-assisted laser desorption ionization are both used for mass verification. Amino acid analysis and peptide mapping can detect sequence errors. Common impurities include truncated sequences, methionine sulfoxide formed by oxidation, and deamidated products. Chromatograms are usually recorded near 214 nm, where the peptide backbone absorbs, and purity is reported as the percentage area of the principal peak.
Verification of a supplied batch generally combines a certificate of analysis with independent testing, because certificates are self-reported documents. A typical package includes a chromatographic trace, a mass spectrum, and a stated water or counter-ion content. Batch-to-batch consistency matters more than a single purity figure when results are compared across experiments. No single mandatory standard governs research-grade peptide release, so laboratories are expected to define their own acceptance criteria. Residual trifluoroacetate from purification is a frequently overlooked counter-ion.
Lyophilized material is chemically stable for extended periods when kept dry, cold, and protected from light. The powder is hygroscopic, so vials should be warmed to room temperature before opening to reduce condensation on the contents. Once dissolved, the peptide is far less stable because peptide bonds are susceptible to hydrolysis and the methionine residue can oxidize. Solutions are typically aliquoted and held at 2-8 °C for short intervals or frozen for longer ones, and repeated freeze-thaw cycles should be avoided.
The compound was developed in the 1980s at the Institute of Molecular Genetics in Moscow, where it emerged from research on short ACTH fragments and their effects on the central nervous system. Russian pharmaceutical listings describe it as a nootropic and neuroprotective agent, most often formulated as nasal drops. It is not a marketed medicine in the United States or the European Union, and no pharmacopoeial monograph covers it. Consequently, most published clinical experience with the substance originates from a small number of research centres, mainly in Russia and neighbouring countries.
Pharmacological accounts link semax to melanocortin signalling and to modulation of neurotrophic factor expression, particularly brain-derived neurotrophic factor and nerve growth factor. Much of this evidence comes from rodent studies using intranasal delivery, a route chosen because it allows peptides to reach the central nervous system with limited systemic exposure. Whether the same mechanisms operate in humans at comparable magnitude remains an open question. The precise receptor or receptors responsible for the reported behavioural and neuroprotective effects have not been conclusively identified.
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.
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。
多数实验室与市售的 Semax 以冻干粉形式提供。冻干粉通常建议保存在 -20 °C 或更低温度下，同时避免光照与反复升温。短期运输有时采用冷藏条件，但长期保存仍以冷冻为主。分包操作应尽量减少开盖次数，以降低吸湿和微生物污染的风险。开封后若未一次用完，建议在干燥环境中密封并尽快放回低温储存。
Regulatory status differs sharply between jurisdictions. In Russia the peptide is registered as a prescription nasal preparation, while agencies such as the United States Food and Drug Administration have not approved it for any indication. Products sold elsewhere are typically labeled for laboratory research only, and such labels shift responsibility for safe handling to the purchaser. Because the same name covers pharmaceutical-grade nasal drops and bulk research powder, identity and purity documentation becomes the main practical concern when comparing sources.
Semax is a synthetic seven-amino-acid peptide whose sequence extends the ACTH(4-10) fragment with a C-terminal proline-glycine-proline tripeptide. The commonly cited sequence is Met-Glu-His-Phe-Pro-Gly-Pro, giving a molecular formula near C37H51N9O10S and a molecular weight close to 813.9 g/mol. It belongs to the broader class of synthetic ACTH fragments studied for central nervous system effects rather than for adrenal steroid stimulation. In practice the material appears as a lyophilized white powder for laboratory work or as a dilute saline solution in clinical settings.
Development is attributed to researchers at the Institute of Molecular Genetics in Moscow during the early 1980s, building on earlier Soviet work with ACTH fragments. Russian regulatory approval followed for intranasal use, and the compound has remained commercially available there for decades. Most published human data originate from Russian and, later, some Eastern European clinical reports, which are not always accessible in English translation. Outside that region the material is generally handled as a research chemical rather than a licensed medicine.
II. Full-thickness defects Full-thickness nasal defects are in three types: (i) wounds to the skin and to the soft tissues, featuring either exposed bone or exposed cartilage, or both; (ii) wounds extending through the nasal skeleton; and (iii) wounds traversing all three nasal layers: skin, muscle, and the osseo-cartilaginous framework. Based upon the dimensions (length, width, depth) and topographic locale of the wound and the number of missing nasal-tissue layers, the surgeon determines the rhinoplastic technique for correcting a full-thickness defect; each of the aesthetic nasal subunits is considered separately and in combination.
The chain quit the Philippine market in 2004 owing to several factors: lack of interest in its standard fare, lack of interest among locals, expensive cost and a general sense of unfamiliarity with local palates. The chain failed to adapt to local tastes and quietly shut down in the summer of 2004.
=== Ratings and awards === In 2005 Hibiscus was one of three restaurants to be awarded three-stars by the Egon Ronay Restaurant Guide, along with The Waterside Inn and Restaurant Tom Aikens, and was named Ronay's Restaurant of the Year. The restaurant made its first entry in the World's 50 Best Restaurants in 2010, ranked in 49th place and one of three British restaurants in the list; the following year it moved up to 43rd. The Good Food Guide ranked Hibiscus as the eighth-best restaurant in the UK in its 2013 guide. The restaurant has been given five AA Rosettes by The Automobile Association.
Sources: en.wikipedia.org
=== Chips === EM351 integrates a programmable ARM Cortex-M 3 processor, IEEE 802.15.4 RF transceiver, 128kB of Flash, 12 KB RAM, and the EmberZNet PRO network protocol stack which supports the Zigbee PRO Feature Set. EM357 incorporates the features of the EM351 but has 192 KB of Flash for applications that require more memory. EM250 SoC combines a radio transceiver with a 16-bit XAP2 microprocessor. It has embedded mesh networking software, on-chip debugging, 128kB of Flash and 5kB of RAM. It was designed for applications that require long battery life, low external component count, and a reliable networking solution. EM260 Co-Processor combines a radio transceiver with a flash-based microprocessor. The interface allows application development with any microcontroller and tool-chain. Like the EM250 it was designed for applications that require long battery life, low external component count, and a reliable networking solution. EM2420 was the first chip Ember created. It has since become obsolete and has been replaced by second and third generation Ember chips.
=== Effects on cardiovascular system === Ghrelin has been theorized to have protective effects on the cardiovascular system. Studies have shown that in mice models of myocardial infarction (MI) with knock-outs of ghrelin, subjects with no endogenous ghrelin production had a significantly increased mortality rate along with worse metrics in terms of cardiac sympathetic activity and systolic function when compared to wild-type subjects. with exogenous ghrelin being shown to improve heart function in rodent models of chronic heart failure and improved ventricular remodeling in post-MI rats.
Crisaborole, sold under the brand name Eucrisa among others, is a nonsteroidal topical medication used for the treatment of mild-to-moderate atopic dermatitis (eczema) in adults and children. The most common side effects are reactions at the application site (including burning or stinging). Crisaborole is a phosphodiesterase 4 (PDE-4) inhibitor, although its specific mechanism of action in atopic dermatitis is not known.
== Epidemiology == Although there is no definitive reporting on its incidence, acrocyanosis shows prevalence in children and young adults than in patients thirty years of age or older. Epidemiological data suggests that cold climate, outdoor occupation, and low body mass index are significant risk factors for developing acrocyanosis. As expected, acrocyanosis would be more prevalent in women than in men due to differences in BMI. However, the incidence rate of acrocyanosis often decreases with increasing age, regardless of regional climate. It completely resolves in many women after menopause implying significant hormonal influences. There is some evidence that many cases of idiopathic acrocyanosis are in some way related to a disorder of estrogen, or aromatase. Around 50% of patients with POTS experience acrocyanosis of their legs while standing still.
Sources: en.wikipedia.org
By choosing porous graphitic carbon as a stationary phase for liquid chromatography, even non derivatized glycans can be analyzed. Detection is here done by mass spectrometry, but in instead of MALDI-MS, electrospray ionisation (ESI) is more frequently used.
The thiol group from the cysteine loses a proton, so it becomes negative charged and the amino group of the histidine catches a proton, which gives it a positive charge. The cysteine makes a bond with the carbon breaking the carbon's double bond with oxygen and converting it into a simple bond. The amino group is attracted by the positive charge of the histidine and a bond between these two is formed. The peptide bond is now broken and the carbonyl group is remade. The NH2R group is released from the histidine. The bond between the thiol group from the cysteine and the carbon is broken and a NHR group replaces it. When this two bonds are broken, the catalytic triad from the chymopapain is available to be used again.
Wolverine's mental health struggles have often been analyzed by academics and psychologists, cited as part of the character's appeal with audiences. In addition to his comic appearances, Wolverine has been depicted in a wide range of adapted and spin-off media, including television, video games, and film. Wolverine's first major appearance outside of comics was in X-Men: The Animated Series (1992–97), voiced by Cal Dodd, which helped popularize the character among the general public; Dodd reprises his role in the revival series X-Men '97 (2024–present). Actor Hugh Jackman has portrayed the character in ten films, beginning with X-Men (2000) and most recently in Deadpool & Wolverine (2024).
Sources: en.wikipedia.org
It consists mainly of animal experiments and small clinical reports, with much of the clinical material published in Russian-language journals. Large independent trials are scarce. Separating reliable effects from chance findings is consequently difficult.
A fraction of an intranasal dose is thought to reach the central nervous system, and this route is favoured partly for that reason. The proportion is not well characterized. Direct measurement in humans remains difficult with current methods.
Raised BDNF and NGF expression has been reported across several animal studies, which makes the signal fairly consistent. Whether the same change occurs in humans at usable doses is not established. It is best treated as a working hypothesis rather than a confirmed clinical mechanism.
It is registered as a pharmaceutical product in Russia, where it is typically supplied as a nasal solution. In most other countries it is not an approved drug and is traded as a research chemical instead. Approval status depends entirely on the jurisdiction involved.