The short version of ACTH(4-10) fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-06-14 and is reviewed periodically as new material appears.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Typical purity | 95% or higher | By reversed-phase HPLC area |
| Identity method | Electrospray mass spectrometry | Confirms molecular mass |
| Purity method | Reversed-phase HPLC | Detection near 214 nm |
| Primary degradation | Methionine oxidation | Sulfoxide product, +16 Da |
| Solution storage | 2-8 °C, short term | Aliquot to avoid freeze-thaw |
Pharmacokinetic accounts emphasize rapid breakdown. After intravenous dosing the intact peptide disappears from blood within minutes, and nasal delivery produces low but measurable concentrations. Metabolites rather than the parent molecule may account for part of the observed activity, although the relative contribution is unresolved. Dosing in the literature varies widely and no optimal schedule has been agreed. These gaps are regularly cited as a reason the findings have not produced broad clinical adoption beyond the original research setting.
Proposed mechanisms center on neurotrophic signaling rather than on classical melanocortin receptor activation. Rodent experiments have reported shifts in the expression of brain-derived neurotrophic factor and nerve growth factor after administration, together with changes in the associated receptor systems. Several authors argue that the peptide acts largely through its degradation products and their interaction with peptidergic pathways, but this remains a hypothesis rather than a settled finding. No single molecular target has been identified in a way that the field broadly accepts.
Published research covers ischemic stroke, traumatic brain injury, cognitive impairment, optic nerve conditions and attention-related measures. Much of the human evidence comes from small trials conducted in one country, which limits how far the results generalize. Animal models supply the larger share of the data, and effects seen in rodents do not transfer automatically to people. Reviews have noted that methodological reporting is often incomplete, making it difficult to pool results or compare treatment schedules across studies.
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.
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.
Identity and purity are commonly assessed by reversed-phase high-performance liquid chromatography, with ultraviolet detection near 214 nanometers for the peptide backbone. Mass spectrometry, either electrospray or matrix-assisted laser desorption, confirms molecular mass and detects truncation or modification products. Amino acid analysis can verify composition. Because the sequence contains no strongly absorbing aromatic residue apart from phenylalanine, detection wavelengths are chosen carefully. Purity values above 95 percent are typical for research-grade material.
Quality documentation for research-grade peptide usually includes a certificate of analysis stating purity, identity, and residual counterion content. Batch-to-batch variation in purity and salt form is a recognized issue, and comparisons across suppliers require attention to the exact counterion, for example acetate versus trifluoroacetate. Sequence verification by tandem mass spectrometry provides stronger evidence than a single mass measurement. For any study reporting biological results, the analytical method and the measured purity should be stated explicitly. Independent verification of supplier claims is considered good practice.
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.
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.
A 2018 Cochrane review on the impact of physical activity, diet and other behavioral interventions for improving cognition and school achievement in children and adolescents found that school and community-based programs as part of an overall prevention program were beneficial. Obese children and adolescents are more likely to become obese as adults. For example, one study found that approximately 80% of children who were overweight at aged 10–15 years were obese adults at age 25 years. Another study found that 25% of obese adults were overweight as children. The latter study also found that if overweight begins before 8 years of age, obesity in adulthood is likely to be more severe. A study has also found that tackling childhood obesity will not necessarily lead to eating disorders later in life. A review of secular trends in the number of overweight or obese children have come to the conclusion that prevalence had increased during the past two decades in the most industrialised countries, apart from Russia and Poland, and in several low-income countries, especially in urban areas. Prevalence doubled or tripled between the early 1970s and late 1990s in Australia, Brazil, Canada, Chile, Finland, France, Germany, Greece, Japan, the UK, and the USA. By 2010, more than 40% of children in the North American and eastern Mediterranean WHO regions, 38% in Europe, 27% in the western Pacific, and 22% in southeast Asia were predicted to be overweight or obese.
== Human sexual orientation and behavior genetics == In the 1990s Hamer began studies on the genetics of human behavior, which led to the first molecular evidence for genes that influence human sexual orientation. His research group's first paper, published in Science in 1993, reported that the maternal but not paternal male relatives of gay men had increased rates of same-sex orientation, suggesting the possibility of sex-linked transmission in a portion of the population. A genetic linkage analysis of DNA samples from these families showed that gay brothers had an increased probability of sharing polymorphic markers on the subtelomeric region of the long arm of the X chromosome, Xq28, providing statistically significant evidence for linkage to the sexual orientation phenotype. This finding was replicated in two other studies in the United States whereas a study in Canada found contrary results; meta-analysis of all data available at that time suggested that Xq28 has a significant but not exclusive effect. Subsequently, a genomewide scan by Hamerʻs group revealed additional regions on autosomes that were moderately linked to male sexual orientation. Hamer's results were supported in 2014 in a large, multi-center genetic linkage study of male sexual orientation. This study's analysis of 409 pairs of gay brothers with over 300,000 single-nucleotide polymorphism markers confirmed the Xq28 linkage by two-point and multipoint LOD score mapping.
=== Squadrons === 22 SAS normally has a strength of 400 to 600. The regiment has four operational squadrons: A, B, D and G. Each squadron consists of approximately 65 members commanded by a major, divided into four troops (each troop being commanded by a captain) and a small headquarters section. Troops usually consist of 16 members. Members of the SAS are variously known as "blade" or "operator". Each patrol within a troop consists of four members, with each member possessing a particular skill e.g. signals, demolition, medic or linguist in addition to basic skills learned during the course of his training. The term "squadron" dates back to the unit's earliest days when the unit's name was intended to confuse German intelligence. The four troops specialise in four different areas:
==== Release of endorphins or adenosine ==== Some modern practitioners support the use of acupuncture to treat pain, but have abandoned the use of qi, meridians, yin, yang and other mystical energies as an explanatory frameworks. The use of qi as an explanatory framework has been decreasing in China, even as it becomes more prominent during discussions of acupuncture in the US. Many acupuncturists attribute pain relief to the release of endorphins when needles penetrate, but no longer support the idea that acupuncture can affect a disease. Some studies suggest acupuncture causes a series of events within the central nervous system, and that it is possible to inhibit acupuncture's analgesic effects with the opioid antagonist compound naloxone, suggesting that the use of acupuncture may trigger the release of endogenous opioids. Mechanical deformation of the skin by acupuncture needles appears to result in the release of adenosine. The anti-nociceptive effect of acupuncture may be mediated by the adenosine A1 receptor. A 2014 review in Nature Reviews Cancer analyzed mouse studies that suggested acupuncture relieves pain via the local release of adenosine, which then triggered nearby A1 receptors. The review found that in those studies, because acupuncture "caused more tissue damage and inflammation relative to the size of the animal in mice than in humans, such studies unnecessarily muddled a finding that local inflammation can result in the local release of adenosine with analgesic effect."
=== Oman === In Dhofar, Oman, frankincense species grow north of Salalah. It was traded in the ancient coastal city of Sumhuram, now Khor Rori, and Al-Baleed, an ancient port. In 2000, UNESCO inscribed the sites as a World Heritage Site Land of Frankincense.
Sources: en.wikipedia.org
2002 Winter Olympic bid scandal – a number of IOC members were forced to resign after it was uncovered that they had accepted inappropriately valuable "gifts" in return for voting for Salt Lake City to hold the Games. 2002 Winter Olympics figure skating scandal – dual gold medals were awarded in pairs figure skating to Canadian pair Jamie Salé and David Pelletier, as well as to Russian pair Elena Berezhnaya and Anton Sikharulidze, after allegations of collusion among judges. Lochtegate – four United States swimmers at the 2016 Summer Olympics including Ryan Lochte were involved in a scandal around an accusation being victims of armed robbery, which ultimately concluded with fines, loss of sponsorships, and statements of apology from the swimmers and various oversight organizations. Russian doping scandal – Russia has the most (51) Olympic medals stripped for doping violations – four times the number of the second country (Belarus). From 2011 to 2015, more than a thousand Russian competitors in various sports, including summer, winter, and Paralympic sports, benefited from a cover-up with no indication that the program has ceased since then.
==== Carcinogenesis and mutagenesis ==== In people receiving immunosuppressants to reduce transplant graft rejection, an increased risk of malignancy (cancer) is a recognised complication. The most common cancers are non-Hodgkin's lymphoma and skin cancers. The risk appears to be related to the intensity and duration of treatment.
== Domains == The SH2 domain of Grb2 binds to phosphorylated tyrosine-containing peptides on receptors or scaffold proteins with a preference for pY-X-N-X, where X is generally a hydrophobic residue such as valine (see [1]). The N-terminal SH3 domain binds to proline-rich peptides and can bind to the Ras-guanine exchange factor SOS. The C-terminal SH3 domain binds to peptides conforming to a P-X-I/L/V/-D/N-R-X-X-K-P motif that allows it to specifically bind to proteins such as Gab-1.
By the time of the First Schleswig War, one-third of Schleswig and half of South Schleswig spoke German as their first language. By the time of the Second Schleswig War in 1864, half of Schleswig and the vast majority of South Schleswig spoke German as their first language.
== Safety == A 2024 study of 35 traditional cottage industry gochujang products found that 8 samples (57% of tested products) exceeded the recommended limit of 4 log CFU/g for Bacillus cereus, a spore-forming bacterium that can produce emetic and diarrheal toxins. The same study also found that 57% of products contained alcohol levels exceeding 1%, which may be relevant for consumers following halal dietary guidelines. However, commercial gochujang produced under standardized manufacturing conditions generally shows lower levels of contamination and alcohol content. A 2015 survey of Korean fermented soybean products found that 13 of 23 gochujang samples tested positive for Bacillus cereus sensu lato, and all isolates carried at least one enterotoxin gene, though contamination levels did not exceed Korea's regulatory limit of 4 log CFU/g. A 2024 study detected aflatoxin in certain gochujang samples from different regions of Korea, with levels varying by geographic origin and fermentation conditions. One sample from Hongcheon contained 25.82 ± 0.66 µg/kg of total aflatoxin.
Sources: en.wikipedia.org
Dry powder is normally held at -20 °C or lower, away from light and moisture. Sealed vials can also be kept at 2-8 °C for shorter intervals. Warming to room temperature before opening prevents condensation.
In solution, hydrolysis of peptide bonds and oxidation of the methionine residue are the principal concerns. Oxidation converts methionine to its sulfoxide form, shifting the mass by sixteen daltons. Both processes are slowed by cold storage and by avoiding alkaline conditions.
A certificate documents what the supplier measured on a specific lot, not how a laboratory will use the material. Independent verification of identity and purity is common practice. Acceptance criteria should be defined before a batch is ordered.
Registered medical products are most often 0.1% nasal drops. Research suppliers ship lyophilized powder, usually in milligram quantities, which is dissolved before use. The active peptide is the same in both cases; presentation and excipients differ.