This is a working overview of nootropic, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2025-12-28 and is reviewed periodically as new material appears.
The parent fragment ACTH(4-10) carries the sequence Met-Glu-His-Phe-Arg-Trp-Gly. Semax replaces the arginine and tryptophan positions with a proline-glycine-proline tail, giving Met-Glu-His-Phe-Pro-Gly-Pro. That change removes residues associated with adrenal stimulation, so the peptide does not drive cortisol release the way full ACTH does. This distinction shapes how the compound is grouped in the literature, where it sits with neuropeptides and peptide neuromodulators rather than with corticosteroids.
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.
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.
| 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 |
=== Framing theory === Framing theory is a mass communications theory that explains how information can be structured and disseminated to promote a specific view on a particular issue. In the context of mental illness portrayals, the media's framing of information about health and mental illnesses can affect an audience's attitudes and beliefs toward those illnesses. As framing is most commonly associated with negative effects, it also has the power to redefine and destigmatize mental illnesses.
Bilirubin in plasma is mostly produced by the destruction of erythrocytes. Heme is metabolized into biliverdin (via heme oxygenase) and then into bilirubin (via biliverdin reductase) inside the macrophages. Bilirubin is then released into the plasma and transported to the liver bound by albumin, since it is insoluble in water in this state. In this state, bilirubin is called unconjugated (despite being bound by albumin). In the liver, unconjugated (indirect) bilirubin is up-taken by the hepatocytes and subsequently conjugated with glucuronic acid (via the enzyme uridine diphosphate–glucuronyl transferase). In this state, bilirubin is soluble in water and it is called conjugated bilirubin. Conjugated (direct) bilirubin is excreted into the bile ducts and enters the duodenum. During its transport to the colon, it is converted into urobilinogen by the bacterial enzyme bilirubin reductase. Most of the urobilinogen is further reduced into stercobilinogen and is excreted through feces (air oxidizes stercobilinogen to stercobilin, which gives feces their characteristic brown color). A lesser amount of urobilinogen is re-absorbed into portal circulation and transferred to the liver. For the most part, this urobilinogen is recycled to conjugated bilirubin and this process closes the enterohepatic circle. There is also an amount of urobilinogen which is not recycled, but rather enters the systemic circulation and subsequently the kidneys, where it is excreted. Air oxidizes urobilinogen into urobilin, which gives urine its characteristic color.
=== Solid state properties === Various specialized properties of molecular crystals and organic polymers with conjugated systems are of interest depending on applications, e.g. thermo-mechanical and electro-mechanical such as piezoelectricity, electrical conductivity (see conductive polymers and organic semiconductors), and electro-optical (e.g. non-linear optics) properties. For historical reasons, such properties are mainly the subjects of the areas of polymer science and materials science.
Solved structures are usually deposited in the Protein Data Bank (PDB), a freely available resource from which structural data about thousands of proteins can be obtained in the form of Cartesian coordinates for each atom in the protein. Many more gene sequences are known than protein structures. Further, the set of solved structures is biased toward proteins that can be easily subjected to the conditions required in X-ray crystallography, one of the major structure determination methods. In particular, globular proteins are comparatively easy to crystallize in preparation for X-ray crystallography. Membrane proteins and large protein complexes, by contrast, are difficult to crystallize and are underrepresented in the PDB. Structural genomics initiatives have attempted to remedy these deficiencies by systematically solving representative structures of major fold classes. Protein structure prediction methods attempt to provide a means of generating a plausible structure for proteins whose structures have not been experimentally determined.
Sponges are physically very distinct from other animals, and were long thought to have diverged first, representing the oldest animal phylum and forming a sister clade to all other animals. Despite their morphological dissimilarity with all other animals, genetic evidence suggests sponges may be more closely related to other animals than the comb jellies are. Sponges lack the complex organisation found in most other animal phyla; their cells are differentiated, but in most cases not organised into distinct tissues, unlike all other animals. Sponges are almost entirely sessile in their adult stage. They lack true nerve cells.
Sources: en.wikipedia.org
Gas-cooled fast reactor cooled by helium. Sodium-cooled fast reactor based on the existing LMFBR and integral fast reactor designs. Lead-cooled fast reactor based on Soviet naval propulsion units. Fast reactors are not necessarily breeders. For example, sodium-cooled fast reactors can operate as transmuters, converters or breeders. Mixed-oxide fuel combines uranium dioxide and plutonium dioxide. Its plutonium content depends on the reactor design and may vary across the core. Another fuel option is metal alloys, typically a blend of uranium, plutonium, and zirconium (used because it is "transparent" to neutrons). Enriched uranium can be used on its own. Many designs surround the reactor core in a blanket of tubes that contain non-fissile uranium-238, which, by capturing fast neutrons from the reaction in the core, converts to fissile plutonium-239 (as is some of the uranium in the core), which is then reprocessed and used as nuclear fuel. Other FBR designs rely on the geometry of the fuel (which also contains uranium-238), arranged to attain sufficient fast neutron capture. The plutonium-239 (or the fissile uranium-235) fission cross-section is much smaller in a fast spectrum than in a thermal spectrum, as is the ratio between the 239Pu/235U fission cross-section and the 238U absorption cross-section. This increases the concentration of 239Pu/235U needed to sustain a chain reaction, as well as the ratio of breeding to fission.
Human diploid cell rabies vaccines (HDCV) Approved HDCVs are grown in the MRC-5 cell line and contains the Pitman-Moore L503 or Flury strain. They are purified by ultrafiltration. HDCVs were first experimentally made by using the WI-38 cell line in 1961. This was a gift to Hilary Koprowski at the Wistar Institute by Leonard Hayflick, an Associate Member, who developed this normal human diploid cell strain. Purified chick embryo cell vaccinee (PCECV) Produced by growing fixed rabies virus strain Flury LEP-25 in primary cultures of chick fibroblasts. Ultracentrifuged. Purified Vero cell rabies vaccine (PVRV) Produced by growing the Wister strain in vero cells, which means the vaccine can be made by growing in a bioreactor vat, making it easier to mass produce. Ultracentrifuged. Brand names include Verorab (Sanofi-Aventis) and Speeda (Liaoning Chengda). Verorab is approved in the Australia European Union. It is also prequalified by the WHO, which means that it is considered appropriate to be used by UN organizations. Primary Hamster Kidney Cell vaccine (PHKCV) Contains the Beijing strain grown in baby hamster kidney cells. Ultracentrifuged. Purified duck embryo vaccine (PDEV) Grown in fertilized duck eggs and ultracentrifuged.
Data from high-throughput chromosome conformation capture experiments, such as Hi-C (experiment) and ChIA-PET, can provide information on the three-dimensional structure and nuclear organization of chromatin. Bioinformatic challenges in this field include partitioning the genome into domains, such as Topologically Associating Domains (TADs), that are organised together in three-dimensional space.
When it became evident that the police was incapable of containing the uprising, the South African Defence Force (SADF) was deployed to assist police operations – first in Joza township, outside Grahamstown, on 6 October, and then in Soweto the following morning. Radio Freedom welcomed the deployments as a sign of the apartheid regime's desperation, declaring, "There is no way out for the Botha regime... Botha’s guns and batons are failing." On 23 October, military repression accelerated in earnest with the launch of Operation Palmiet (Afrikaans for "bullrush") in Sebokeng and three nearby townships, Sharpeville, Boipatong, and Bophelong. As part of a campaign to "rid the area of criminal and revolutionary elements", a heavily armed joint force of 7,000 police and SADF members cordoned off the townships and conducted a house-to-house search of about 19,500 houses, accommodating an estimated 225,000 people. After being searched in their home and at roadblocks, residents were given labels or ink to wear to prove that they had been "vetted" and were allowed to move around. The labels bore the printed slogan, "I am your friend, trust me", while stamps on people's hands read "friendly forces". The Washington Post said that it was "the biggest crackdown on political dissent ever mounted" in South Africa, as well as the first time that the military had been "employed so openly to quell racial dissent".
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 short synthetic peptide built from seven amino acids: methionine, glutamic acid, histidine, phenylalanine and three prolines. The sequence derives from the 4-10 fragment of adrenocorticotropic hormone with an added proline-glycine-proline tail. No plant or animal extract is involved; the material is produced by solid-phase peptide synthesis.