The short version of nootropic fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-08-01. Anything still debated is marked as such rather than presented as settled.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic heptapeptide | Analogue of the ACTH(4-10) fragment |
| Amino acid sequence | Met-Glu-His-Phe-Pro-Gly-Pro | Single-letter form MEHFPGP |
| Molecular formula | C37H51N9O10S | Free peptide, nominal mass near 814 Da |
| First registration | 1994, Russia | Nasal formulation for neurological indications |
| Typical purity grade | 95% or higher by HPLC | Research material; higher grades used as reference standards |
Russian regulatory authorities approved the peptide for nasal administration, and it remains listed in the national pharmacopoeia under several trade names. Documented indications include acute ischemic stroke, transient ischemic attacks, traumatic brain injury, and certain ophthalmological and neurological conditions. Physicians also prescribe it for cognitive complaints in older patients, although the evidence base for that use is thinner. Outside Russia and a few neighboring states, the substance is not an approved medicine and is sold instead as a research chemical.
Later generations of the molecule include an N-acetylated form and an amidated form, both marketed online alongside the parent peptide. These variants differ in terminal chemistry and stability, and they are frequently discussed in the same breath even though they have not been compared in controlled trials. Supply outside formal healthcare systems comes largely from laboratories that synthesize peptides to order. Purity and identity of these materials vary widely, and no single body oversees the international trade.
Semax is a synthetic heptapeptide developed in the Soviet Union during the 1980s by researchers at the Institute of Molecular Genetics in Moscow. It was designed as a truncated analog of adrenocorticotropic hormone, retaining only the fragment spanning residues four through ten. Investigators sought a peptide that would preserve the cognitive effects associated with ACTH while eliminating the hormonal stimulation of the adrenal cortex. The compound entered clinical use in Russia during the following decade.
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.
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.
The compound is registered in Russia as a pharmaceutical product, most commonly formulated as a nasal solution, and has been used in that setting since the 1990s. Outside that jurisdiction it is generally handled as a research chemical rather than an approved medicine. Regulatory status therefore differs sharply between countries, and material sold internationally may not correspond to the Russian pharmaceutical formulation. Documentation with commercial samples is typically limited to a certificate of analysis covering purity and identity, not clinical status or local legal classification.
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.
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。
Females – Ovariole number is significantly affected by developmental temperature in D. melanogaster. Egg size is also affected by developmental temperature, and exacerbated when both parents develop at warm temperatures (See Maternal effect). Under stressful temperatures, these structures will develop to smaller ultimate sizes and decrease a female's reproductive output. Early fecundity (total eggs laid in first 10 days post-eclosion) is maximized when reared at 25 °C (versus 17 °C and 29 °C) regardless of adult temperature. Across a wide range of developmental temperatures, females tend to have greater heat tolerance than males. Males – Stressful developmental temperatures will cause sterility in D. melanogaster males; although the upper temperature limit can be increased by maintaining strains at high temperatures (See acclimation). Male sterility can be reversible if adults are returned to an optimal temperature after developing at stressful temperatures. Male flies are smaller and more successful at defending food/oviposition sites when reared at 25 °C versus 18 °C; thus smaller males will have increased mating success and reproductive output.
Coca leaves have been used by indigenous South Americans for thousands of years, both as a stimulant and for medicinal purposes. When the Spanish arrived in South America, they initially banned coca but soon legalized and taxed it after seeing its importance to local labor. The active ingredient was first isolated in 1855 by Friedrich Gaedcke and later refined by Albert Niemann, who named it "cocaine". In the late 1800s, cocaine became popular in Western medicine as a local anesthetic and was widely used in various products, including drinks and remedies. and James Leonard Corning demonstrated peridural anesthesia. However, due to its toxic effects and potential for abuse, safer alternatives eventually replaced it in medical practice. Large-scale coca cultivation and cocaine production occurred in Asia, on Taiwan (then known as Formosa) and Java (today part of Indonesia) before World War II. Since the 1980s, the cocaine trade was dominated by centralized, hierarchical drug cartels such as Medellín and Cali, along with their successors and early FARC factions. By the early 2000s, this model fragmented into a diverse network of global trafficking links, allowing South American cocaine production to easily supply markets in Europe, Africa, Asia, and Oceania through various routes.
In 2009 of October, Eurogentec announced the acquisition of AnaSpec, a privately owned proteomics company based in Fremont, USA. Anaspec is a provider of proteomics for life science research; they specialize in peptides synthesis, labelled peptides and antibodies, fluorescent dyes and enzyme activity assays. In 2010, Kaneka acquired a majority stake in Eurogentec S.A. Kaneka's products include synthetic resins, resin products, chemicals, foodstuffs, pharmaceuticals, medical devices, electrical raw materials and synthetic fibres. In 2012, the company started commercial manufacturing of a biopharmaceutical for USA market.
== Veterinary use == Methadone is a common perioperative analgesic in cats and dogs with a variety of routes of administration. Methadone in combination with acepromazine provides greater sedation than the equivalent combination involving morphine or butorphanol. Methadone's depressive effect on the cardiovascular system is approximately twice as strong as morphine. Methadone is contradicated for gastroduodenoscopy. Methadone provides greater analgesia than buprenorphine for orthopaedic and ovariohysterectomy procedures in dogs. Fluconazole and methadone given concurrently as a subcutaneous administration twice over a 6 hour period can provide analgesia for 12–24 hours. Methadone can be used for sedation in horses but is less effective than butorphanol, it can be combined with detomidine, which improves efficacy but can cause ataxia although the combination with detomidine has significantly less cardiovascular depressive effects than a combination with acepromazine. Methadone may be more effective as an analgesic in horses when adiminstered parenterally or epidurally as opposed to intravenously. Opioids are uncommon for livestock due to legislation surrounding usage but intravenous methadone is an effective analgesic in sheep and epidural methadone is an effective analgesic in cattle and sheep. Methadone comes as levomethadone and dextromethadone with the former sometimes combined with the anti-cholinergic fenpipramide. Oral methadone is poorly absorbed in most species.
Pierogi, however, require complete immersion, followed by the removal of excess liquid—a significant technological challenge both in terms of the freeze-drying process and the preparation of the dish on board the ISS. While hot water can be added from a dispenser, there is no way to dispose of the leftover liquid. To solve this, freeze-dried vegetable broth was added to the pouch, allowing astronauts to first drink the broth in which the pierogi rehydrated and then enjoy the main dish. NASA's Advanced Food Technology Project (AFT) is researching ways to ensure an adequate food supply for long-duration space exploration missions. This research is primarily focused on mitigating the adverse health effects caused by long duration spaceflight. The impact to health can include symptoms such as weight loss, dehydration, a reduction in red blood cell count, constipation and electrolyte imbalances. The Advanced Food Technology Project aims to develop space foods that minimize these adverse effects.
Sources: en.wikipedia.org
=== Global competitive position === The UK's competitive position in AI is strong relative to most nations but faces structural challenges in competing with the US and China. London has been identified as the leading city in Europe for AI company formation, ahead of Berlin, Paris, and Stockholm. The UK's academic base is a key strength: three of the world's top ten universities are British, and qualitative research for the Sector Study found that investors regard UK universities as a primary source of commercially valuable AI innovation. In comparative terms, the UK's pro-innovation regulatory approach has attracted more AI investment than the more heavily regulated EU environment, though critics argue this comes at the cost of consumer protection and public trust. France, which has pursued a more state-led AI strategy with significant public investment, ranked fifth in the Global AI Index in 2024 and attracted 30% of all European venture capital dedicated to AI. Germany, with its emphasis on industrial AI adoption, has achieved an AI adoption rate of 11.6% among companies, above the EU average of 8%, and projects its AI market to reach €37 billion by 2031. The UK's strategy increasingly focuses on "accelerated diversification", meaning deploying AI across healthcare, education, and science, and on building sovereign capabilities in specific layers of the AI stack where the UK has genuine competitive advantages, rather than attempting to replicate the scale of US or Chinese investment in frontier model training.
Oxandrolone is based on the tetracyclic steroid framework, which consists of three cyclohexane rings (A, B, and C) and one cyclopentane ring (D). This framework is a common structure shared by all steroids. The oxygen atom in the lactone bridge replaces a carbon atom at position 2 of the steroid nucleus, classifying oxandrolone as a 2-oxa-steroid. There is a hydroxyl group (-OH) attached at stereo-direction β to carbon 17, which is a characteristic of 17β-hydroxy-steroids. The overall structure of oxandrolone is distinguished by these modifications to the standard steroid nucleus, which contribute to its unique properties as an anabolic steroid. The lactone bridge, i.e., the 2-oxa-steroid classification, is not commonly found in the steroid family. This structural element is what gives oxandrolone its distinctive chemical identity within the class of anabolic steroids. Due to its lactone bridge, oxandrolone is resistant to inactivation by 3α-hydroxysteroid dehydrogenase in skeletal muscle. This resistance, in contrast to DHT, is believed to underlie oxandrolone's preserved anabolic potency As oxandrolone is already a 5α-reduced steroid (has a single bond between carbons 4 and 5), it is not a substrate for the 5α-reductase enzyme, hence is not potentiated in androgenic tissues such as the skin, hair follicles, and prostate gland. In addition, the 5α-reduced state preserves oxandrolone from being a substrate for the aromatase enzyme; therefore, oxandrolone cannot be aromatized into metabolites with estrogenic activity.
==== Lack of transparency in project management ==== Transparency issues arise from the allocation of contracts for water infrastructure projects. Iran's opaque procurement process often involves awarding contracts to companies associated with political elites without open and fair competition. This leads to inflated project costs and results in poor quality and environmentally damaging outcomes. A notable example is the Gotvand Dam project. Despite warnings from environmental experts about the dam's construction on salt beds, which would increase the salinity of the Karun River, the project proceeded due to political pressure and vested interests. The dam's construction led to severe ecological damage and increased salinity levels, rendering the water unusable for agriculture and consumption downstream.
==== Panama Canal ==== In 2024, Trump demanded that Panama return control of the Panama Canal to the United States because "excessive rates" were being charged for American passage. The United States previously was in control of the Panama Canal Zone from 1903 until 1999, and has invaded Panama before in 1989. Trump told Congress in March 2025 that his administration "will be reclaiming the Panama Canal". Also that month, Defense Secretary Pete Hegseth instructed the Trump administration to "immediately" present "credible military options to ensure fair and unfettered US military and commercial access to the Panama Canal".
Sources: en.wikipedia.org
The Spartanburg Pellagra Hospital in Spartanburg, South Carolina, was the first facility in the United States dedicated to discovering the cause of pellagra. It was established in 1914 with a special Congressional appropriation to the U.S. Public Health Service and set up primarily for research. In 1915, Dr. Joseph Goldberger, assigned to study pellagra by the surgeon general of the United States, showed it was linked to diet by observing the outbreaks of pellagra in orphanages and mental hospitals. Goldberger noted that children between the ages of 6 and 12 (but not older or younger children at the orphanages) and patients at the mental hospitals (but not doctors or nurses) were the ones who seemed most susceptible to pellagra. Goldberger theorized that a lack of meat, milk, eggs, and legumes made those particular populations susceptible to pellagra. By modifying the diet served in these institutions with "a marked increase in the fresh animal and the leguminous protein foods," Goldberger was able to show that pellagra could be prevented. By 1926, Goldberger established that a diet that included these foods, or a small amount of brewer's yeast, prevented pellagra. Goldberger experimented on 11 prisoners (one was dismissed because of prostatitis). Before the experiment, the prisoners were eating the prison fare fed to all inmates at Rankin Prison Farm in Mississippi. Goldberger started feeding them a restricted diet of grits, syrup, mush, biscuits, cabbage, sweet potatoes, rice, collards, and coffee with sugar (no milk).
The Streptavidin-Binding Peptide (SBP)-Tag is a 38-amino acid sequence that may be engineered into recombinant proteins. Recombinant proteins containing the SBP-Tag bind to streptavidin and this property may be utilized in specific purification, detection or immobilization strategies. The sequence of the SBP tag is MDEKTTGWRGGHVVEGLAGELEQLRARLEHHPQGQREP.
The first observations and size measurements of nano-particles were made during the first decade of the 20th century. Zsigmondy made detailed studies of gold sols and other nanomaterials with sizes down to 10 nm and less. He published a book in 1914. He used an ultramicroscope that employs a dark field method for seeing particles with sizes much less than light wavelength. There are traditional techniques developed during the 20th century in interface and colloid science for characterizing nanomaterials. These are widely used for first generation passive nanomaterials specified in the next section. These methods include several different techniques for characterizing particle size distribution. This characterization is imperative because many materials that are expected to be nano-sized are actually aggregated in solutions. Some of methods are based on light scattering. Others apply ultrasound, such as ultrasound attenuation spectroscopy for testing concentrated nano-dispersions and microemulsions. There is also a group of traditional techniques for characterizing surface charge or zeta potential of nano-particles in solutions. This information is required for proper system stabilization, preventing its aggregation or flocculation. These methods include microelectrophoresis, electrophoretic light scattering, and electroacoustics. The last one, for instance colloid vibration current method is suitable for characterizing concentrated systems.
Sources: en.wikipedia.org
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.
No. The peptide is synthetic, although it is modelled on a fragment of a naturally occurring hormone. ACTH(4-10) is generated when ACTH is cleaved, but the Pro-Gly-Pro extension is not a known endogenous sequence. It is therefore a designed analogue rather than a natural metabolite.
The label reflects reported effects on attention, memory and recovery after neurological injury in regional clinical reports. Those reports are mostly small and have not been widely replicated outside the region. The classification is descriptive and does not imply a single defined mechanism.
It is a synthetic seven-amino-acid peptide built from the ACTH(4-7) sequence plus a Pro-Gly-Pro tail. It belongs to the family of short ACTH fragments studied for nervous-system effects. Its backbone contains only standard amino acids.