neuropeptide raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2025-11-28 and is reviewed periodically as new material appears.
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.
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.
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.
| 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 |
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It is described in the literature as an analogue of the ACTH(4–10) fragment, a short N-terminal portion of adrenocorticotropic hormone that retains some neurotropic activity without the full hormonal effects of the parent peptide. The molecule carries a methionine residue at the N-terminus and two proline residues near the C-terminus, features that shape both its interactions with receptor systems and its chemical stability. The free peptide corresponds to the formula C37H51N9O10S and a molecular mass near 813.9 Da.
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.
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.
==== Estrogens (estrogen receptor agonists) ==== Conjugated estrogens (conjugated equine estrogens; CEEs; Premarin) – estrogen (estrogen receptor agonist) – atrophic vaginitis, dyspareunia [132] Conjugated estrogens oral (Enjuvia; synthetic conjugated estrogens) – estrogen (estrogen receptor agonists) – atrophic vaginitis [133] Conjugated estrogens/bazedoxifene (Aprela; bazedoxifene acetate/conjugated estrogens; bazedoxifene/conjugated estrogens; bazedoxifene/Premarin; BZA/CE; CE/BZA; conjugated estrogens/bazedoxifene acetate; Duavee; Duavive; Premarin/bazedoxifene; SERM + Premarin) – combination of conjugated estrogens (estrogen) and bazedoxifene (selective estrogen receptor modulator (SERM)) – atrophic vaginitis [134] Estradiol (Estrofem; Innofem; oral estradiol; Vagifem; vaginal estradiol) – estrogen (estrogen receptor agonist) – atrophic vaginitis [135] Estradiol transdermal micro patch (Estradot; Minivelle; Vivelle-Dot) – estrogen (estrogen receptor agonist) – atrophic vaginitis [136] Estradiol vaginal (E2; 17β-estradiol; Estradiol VagiCap; Imvexxy; Joyesta; TX-12-004-HR; TX-004HR; VagiCap; Yuvvexy) – estrogen (estrogen receptor agonist) – atrophic vaginitis [137] Estradiol acetate (Estrace; estradiol acetate intravaginal ring; estradiol acetate IVR; Femring; Menoring) – estrogen (estrogen receptor agonist) – atrophic vaginitis [138] Estriol succinate vaginal gel (6α-hydroxyestradiol; Blissel; Gelistrol) – estrogen (estrogen receptor agonist) – atrophic vaginitis [139] Estriol/lactobacillus (estriol-Lactobcillus acidophilus mixt.; estriol/lyophilised lactobacilli; Gynoflor; ultra-low dose estrogen/lactobacillus) – combination of estriol (estrogen) and lactobacillus (probiotic) – atrophic vaginitis [140] Ospemifene (FC-1271a; Ophena; Osphena; Senshio) – selective estrogen receptor modulator (SERM) – atrophic vaginitis, dyspareunia [141]
=== Esperanto === Since Esperanto allows word compounding, there are no limits on how long a word can theoretically become. An example is the 39-letter word oranĝ-kanton-pafil-limig-aktivul-malamanto, meaning "Orange County gun control activist hater". Such clusters are not considered good style (the 8-word alternative oranĝkantona malamanto de aktivuloj por limigo de pafiloj is more standard), but they are permissible under the rules of Esperanto grammar. Hyphens are optional in Esperanto compounds, so oranĝkantonpafillimigaktivulmalamanto is also technically a valid spelling. Disregarding compounding, conjugation, and affixes, the longest Esperanto word formally recognized by the Akademio de Esperanto is the 15-letter proper noun Konstantinopolo (Constantinople). The next longest recognized words are the following 13-letter words:
Sodium azide has gained attention in the Netherlands and abroad as a chemical used for homicidal and suicidal purposes. Sodium azide has been attributed to at least 172 deaths in the period from 2015 to 2022 as part of an illicit substance used as a suicide aid commonly called drug X (Dutch: middel X) In 2021, a review of all case reports of sodium azide intoxication indicated that 37% of cases were suicide attempts. An increase in the usage of sodium azide as a suicide drug has been attributed to its availability through pyrotechnics-focused online stores.
But in the Psychedelics Encyclopedia, author Peter Stafford writes: "The psilocybin experience seems to be warmer, not as forceful and less isolating. It tends to build connections between people, who are generally much more in communication than when they use LSD."
=== TruB === The TruB family only contains PUS 4 located in the mitochondrion and nucleus. PUS 4 modification is heavily conserved located in the U55 in the elbow of the tRNA. The human form of PUS 4 is actually missing a binding domain called PUA or pseudouridine synthase and archaeosine trans-glycosylase. PUS 4 has a sequence specificity for T-loop part of the tRNA. Preliminary data of PUS4 modifying mRNA, but more research is needed to confirm. Also binds to a specific Brome Mosaic Virus, which is a plant-infecting RNA virus.
Sources: en.wikipedia.org
Shot noise is a type of electronic noise that occurs when the finite number of particles (such as electrons in an electronic circuit or photons in an optical device) is small enough to give rise to statistical fluctuations in a signal. Shot noise is a Poisson process, and the charge carriers that make up the current follow a Poisson distribution. The root mean square current fluctuation is given by
==== Pat Farrell's Alpha-Angle Freeze Mark ==== A specialized brand system is required to mark many animals such that each can be individually identified. Arabic numerals are difficult to brand much smaller than 4 inches (10 cm) tall. Further, conventional numbers can be altered, with a branded "3" easily turned into an "8," potentially shifting apparent ownership of the horse. It is also inconvenient to carry a dozen or more unique brands into the field if animals must be branded there.
=== Sheep === In sheep, ketosis, evidenced by hyperketonemia with beta-hydroxybutyrate in blood over 0.7 mmol/L, is referred to as pregnancy toxemia. This may develop in late pregnancy in ewes bearing multiple fetuses and is associated with the considerable metabolic demands of the pregnancy. In ruminants, because most glucose in the digestive tract is metabolized by rumen organisms, glucose must be supplied by gluconeogenesis. Pregnancy toxemia is most likely to occur in late pregnancy due to metabolic demand from rapid fetal growth and may be triggered by insufficient feed energy intake due to weather conditions, stress or other causes. Prompt recovery may occur with natural parturition, Caesarean section or induced abortion. Prevention through appropriate feeding and other management is more effective than treatment of advanced stages of pregnancy toxemia.
Galloway told The Independent on Sunday in June 2012: "I am not a pacifist. I am a revolutionary. I am a Socialist who doesn't like Capitalism and who likes Imperialism less. ... I support the armed struggle where there is no alternative." In a 2002 interview with The Guardian, Galloway said he had supported the Soviet Union and said that its end was "the biggest catastrophe of my life". By 2013, he described himself on Twitter as "pro-Palestine, anti-war, pro-equality, anti-Islamophobia". In 2024, Galloway identified as socially conservative, and in 2025 he said he "no longer want[s] to hear [himself] described as a leftist", adding that "it now means liberalism, licence, ‘refugees welcome here’ and so on. All this is inimical to the interests of the working class". Writing for The Guardian in 2024, Michael Chessum argued that Galloway's politics had shifted in the latter half of the 2010s, embracing Scottish unionism and social conservatism alongside more typically leftist positions, and highlighting the involvement of the socially conservative Communist Party of Great Britain (Marxist–Leninist) in the early years of the Workers Party. Chessum likened Galloway's political evolution to that of German politician Sahra Wagenknecht, a leading member of The Left who broke away to found her own eponymous political movement, and who similarly espouses socially conservative positions and anti-NATO views.
Sources: en.wikipedia.org
antibiotic resistance gene A gene that confers resistance to one or more specific antibiotic compounds. In molecular cloning, plasmid vectors are often designed to carry antibiotic resistance genes as selectable markers alongside other genes of interest, because it permits the artificial selection of successfully transformed cell populations when the cells are cultured in the presence of the antibiotic.
The experiment did not prove that proteins were formed on primordial earth using primarily heat, but Fox and Kaoru Harada believed it suggested that if proteinoids could be synthesized using just heat and the amino acids formed from the Miller–Urey experiment, then more research could lead to an answer to how anabolic reactions, enzymatic proteins, and nucleic acids were first formed and in turn, how the earliest forms of life originated. Fox noted that there were various ways of setting up the experiment. One could also replace L-glutamic acid with L-glutamine without preheating it in an oil bath and then add phosphoric acid. The phosphoric acid would act as a catalyst for the formation of peptide bonds. There are some that are skeptical of this type of experiment. These people believe that for the experiment to be plausible, prebiotic Earth would have needed high concentrations of the lysine, glutamic acid, and aspartic acid because they were at high concentrations in Fox's experiment. Some believe it is unlikely that primordial Earth had such a distribution of amino acids available on its surface.
Plane Poiseuille flow is flow created between two infinitely long parallel plates, separated by a distance h with a constant pressure gradient G = −dp/dx is applied in the direction of flow. The flow is essentially unidirectional because of infinite length. The Navier–Stokes equations reduce to
Peptide hormones are hormones composed of peptide molecules. These hormones influence the endocrine system of animals, including humans. Most hormones are classified as either amino-acid-based hormones (amines, peptides, or proteins) or steroid hormones. Amino-acid-based hormones are water-soluble and act on target cells via second messenger systems, whereas steroid hormones, being lipid-soluble, diffuse through plasma membranes to interact directly with intracellular receptors in the cell nucleus. Like all peptides, peptide hormones are synthesized in cellsfrom amino acids based on mRNA transcripts, which are derived from DNA templates inside the cell nucleus. The initial precursors, known as preprohormones, undergo processing in the endoplasmic reticulum. This includes the removal of the N-terminal signal peptide and, in some cases, glycosylation, yielding prohormones. These prohormones are then packaged into secretory vesicles, which are stored and released via exocytosis in response to specific stimuli, such as an increase in intracellular Ca2+ and cAMP levels. Prohormones often contain extra amino acid sequences necessary for proper folding but not for hormonal activity. Specific endopeptidases cleave the prohormone before secretion, producing the mature, biologically active hormone. Once in the bloodstream, peptide hormones travel throughout the body and bind to specific receptors on target cell membranes.
==== Involvement of Mexican cartels in the Russo-Ukrainian War ==== In July 2025, the Mexican Intelligence in collaboration with Ukrainian security forces, revealed that in the Russian invasion of Ukraine Colombian and Mexican mercenaries were sent in the war-zone in the International Legion by the drug cartels to gain war tactics and especially knowledge on the use of drones FPV for battles with the security forces and rival cartels in Mexico. In August 2025, it was revealed that the Jalisco New Generation Cartel (CJNG) created a specific paramilitary unit, of at least 10 members, for the use of drones FPV using the tactics learned in the War in Ukraine.
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.
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.