lyophilized powder is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2025-08-10. Where a claim depends on a specific study, the study is described rather than over-claimed.
Semax binds to melanocortin receptors and is thought to influence neuronal survival and plasticity rather than to act through the adrenal axis. Laboratory work has shown increased expression of brain-derived neurotrophic factor and nerve growth factor in treated tissue. Changes in c-Fos, a marker of neuronal activation, have also been reported. Because the peptide is rapidly degraded by peptidases, its effects are generally attributed to downstream signaling cascades rather than to sustained receptor occupancy.
Published studies are dominated by animal models of stroke, ischemia, and cognitive impairment, with a smaller number of human trials conducted in Russia. Many of the human reports are small, single-center, and published in Russian-language journals, which limits independent scrutiny. Outcome measures vary between studies and often rely on clinician-rated scales rather than objective biomarkers. Systematic reviews have noted the methodological weaknesses and called for larger, preregistered trials before firm conclusions can be drawn.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White lyophilized powder | Typical for synthetic peptides |
| Solubility | Freely soluble in water | Also soluble in saline |
| Storage temperature | -20 C or below | Protect from repeated freeze-thaw |
| Analytical method | Reverse-phase HPLC | Confirms purity and identity |
| Common synonym | ACTH(4-10) analog | Reflects structural origin |
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 supplied as a lyophilized powder that appears white to off-white. It dissolves readily in water, phosphate-buffered saline, and other aqueous media, which simplifies preparation of working solutions for laboratory use. The nasal products registered in Russia are dilute aqueous solutions, typically around 0.1 percent peptide by weight. Organic solvents are rarely necessary and can complicate handling. Because the peptide is hygroscopic, weighing should be performed quickly and with minimal exposure to ambient humidity.
Solid material is normally kept at minus 20 degrees Celsius in a sealed, desiccated container. Reconstituted solutions are less stable and are usually divided into single-use aliquots before freezing. Repeated freeze-thaw cycles are avoided because they promote aggregation and loss of activity. Light exposure is minimized by using amber glassware or foil wrapping. Published stability data for this peptide are sparse, so recommended storage conditions rest mainly on general practice for short synthetic peptides rather than on dedicated study.
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.
Providing constitutional protections for minorities in the face of majoritarian pressure remains a fraught challenge. India is a secular state and guarantees the fundamental right to freedom of religion ("Liberty of thought, expression, belief, faith, and worship").
== External links == Long, Nguyen Van Duc; Sengupta, Sourjo; Zhuang, Changping; Richter, Katharina; Hessel, Volker (January 2026). "Plasma-activated water in agriculture, food safety, and healthcare". Chemical Engineering Journal. 528 172535. Bibcode:2026ChEnJ.52872535L. doi:10.1016/j.cej.2025.172535. Plasma Activated Water [PAW] Application Note Wong, Kiing S.; Chew, Nicholas S. L.; Low, Mary; Tan, Ming K. (23 July 2023). "Plasma-Activated Water: Physicochemical Properties, Generation Techniques, and Applications". Processes. 11 (7): 2213. doi:10.3390/pr11072213. Plasma activated water Xiang, Qisen; Fan, Liumin; Li, Yunfei; Dong, Shanshan; Li, Ke; Bai, Yanhong (20 March 2022). "A review on recent advances in plasma-activated water for food safety: current applications and future trends". Critical Reviews in Food Science and Nutrition. 62 (8): 2250–2268. Bibcode:2022CRFSN..62.2250X. doi:10.1080/10408398.2020.1852173. PMID 33261517. The power of plasma: turning water into an eco-friendly disinfectant Scholtz, Vladimír; Jirešová, Jana; Lokajová, Eliška; Měřínská, Tereza; Thonová, Laura; Šerá, Božena (July 2025). "Is Plasma Activated Water Really Magical? A Reflection on the Phenomenon". Plasma Chemistry and Plasma Processing. 45 (4): 1337–1351. Bibcode:2025PCPP...45.1337S. doi:10.1007/s11090-025-10565-0. Gan, Dingwei; Hong, Longfei; Yuan, Shuai; Zhu, Mengying; Gao, Yuting; Zhang, Tianqi; Li, Tianyu; Chen, Bohan; Dzimitrowicz, Anna; Jamroz, Piotr; Cullen, Patrick J.; Zhou, Renwu (2025).
This list of notable coffeehouse chains catalogues the spread and markets share of coffeehouses world-wide. This list excludes the many companies which operate coffeeshops within retail establishments, notably bookstores and department stores, or restaurants or convenience stores which also serve coffee. These chains frequently engage in coffee wars to gain brand and consumer market share. Starbucks, Luckin Coffee and Dunkin' are the three largest coffee companies in the world, respectively. The largest coffee houses typically have substantial supply-chain relations with the world's major coffee-producing countries. They collectively wield prominent influence in global coffee economics by setting commodity prices, maintaining value chains, and supporting developing economics.
==== As a vector backbone for COVID-19 vaccine ==== For effective prevention of infections caused by SARS-CoV-2, the ability of the vaccine to stimulate the mucosal immunity of the upper respiratory tract, including the nasal cavity, might be highly important. Such immunity is able to strengthen the antiviral barrier in the upper respiratory tract and provide reliable protection against COVID-19. It has been demonstrated that intranasally administered SeV can elicit strong mucosal immunity. Thus, mucosal vaccination with SeV generates robust IgA and IgG antibodies production by nasal-associated lymphoid tissue and by lungs of cotton rats. These antibodies facilitated rapid protection against human parainfluenza virus-type 1. In China, Fudan University in collaboration with Pharma Co. Ltd. is engaged in development of the vaccine for COVID-19 prevention. SeV serves as a backbone vector in the project. Researchers from the Fudan University have significant experience working with SeV vectors; they created SeV based vaccine for tuberculosis prevention, which is in pre-clinical testing. There are two Sendai virus strains in China that were described in scientific publications. One of them is BB1 strain, which derived from the Moscow virus strain and has less than 20 non-synomic substitutions compared to Moscow strain. The strain BB1 was given to the researchers of Institute of Viral Disease Control and Prevention, Beijing, China by researchers of Ivanovsky Institute of Virology, Moscow, Russia in the 1960s. Another strain is Tianjin strain, isolated in China in 2008.
Sources: en.wikipedia.org
A biosynthetic pathway has been hypothesized based on proposed gene functions (see figure). btmM, with homology to Zn+2 aminopeptidases, is predicted to cleave the N-terminal methionine residue, which is not present in the bottromycin final product. btmE and btmF both contain YcaO-like domains. It is believed that one Although it is unclear which enzyme is responsible for which step, it is hypothesized that one catalyzes macrocyclic amidine formation while the other catalyzes thiazoline formation. btmJ, encoding an enzyme with cytochrome P450 homology, may oxidize the thiazoline to the thiazole. btmH or btmI both have homology to hydrolytic enzymes (α/β hydrolase and metallo-dependent hydrolase, respectively) may catalyze follower peptide hydrolysis. An alternative proposed role for btmH or btmI is to function as a cyclodehydratase in macrocyclization. Gene deletion studies failed to elucidate the function of other proteins within the cluster.
Keratoplasty also known as corneal transplantation is the main treatment option for visual improvement in corneal opacity. In this, the opaque cornea is replaced with donor tissue. Depending on type and density of corneal opacity different types of keratoplasty may be used such as:
== Derivatives == Borofalan (boronophenylalanine) is a dihydroxyboryl derivative of phenylalanine, used in neutron capture therapy. 4-Azido-L-phenylalanine is a protein-incorporated unnatural amino acid used as a tool for bioconjugation in the field of chemical biology.
Sources: en.wikipedia.org
== External links == Media related to Earthworms at Wikimedia Commons Data related to Lumbricina at Wikispecies Chisholm, Hugh, ed. (1911). "Earthworm" . Encyclopædia Britannica (11th ed.). Cambridge University Press.
== Research contributions == Brenner has made multiple contributions to molecular biology and biochemistry, beginning with purification and characterization of the Kex2 proprotein convertase at Stanford. Significant research projects include the role of Ap3A binding in the function of the FHIT tumor suppressor gene, characterization and inhibition of DNA methylation, and discovery of new steps in nicotinamide adenine dinucleotide (NAD) metabolism. Notably, the Brenner laboratory discovered that eukaryotes use nicotinamide riboside (NR) to make NAD+. Bieganowski and Brenner (2004) found that NR is converted to NAD+ through the action of nicotinamide ribose kinases including Nrk1 (yeast and human) and Nrk2 (human). Belenky et al. (Cell, 2007) reported another pathway which turns NR into NAM through the action of nucleosidases Urh1/Pnp1/Meu1 and is Nrk1 independent.
=== Membrane protein databases === TCDB - Transporter Classification database, a comprehensive classification of transmembrane transporter proteins Orientations of Proteins in Membranes (OPM) database - 3D structures of integral and peripheral membrane proteins arranged in the lipid bilayer Protein Data Bank of Transmembrane Proteins - 3D models of transmembrane proteins approximately arranged in the lipid bilayer. TransportDB - Genomics-oriented database of transporters from TIGR Membrane PDB Archived 2020-08-03 at the Wayback Machine - Database of 3D structures of integral membrane proteins and hydrophobic peptides with an emphasis on crystallization conditions Mpstruc database Archived 2013-12-25 at the Wayback Machine - A curated list of selected transmembrane proteins from the Protein Data Bank MemProtMD - a database of membrane protein structures simulated by coarse-grained molecular dynamics Membranome database provides information about bitopic proteins from several model organisms
Risks arising from their use should not exceed the threshold of 'maximum acceptable risks'. The new implementing regulations seek to specify this threshold." While devices for neurostimulation with an intended medical purpose require a pre-market approval, their direct-to-consumer products are only subjected to the CE marking of conformity. The EU lacks specific regulations and directives dedicated to neurotechnologies. Therefore, any physician, nurse, psychologist, occupational therapist, or specialist in neurotechnology and bioengineering may conduct neurotherapy. In the United States, the Food and Drug Administration (FDA) does not regulate neurotherapy (since it is the practice of medicine). "Licenses—such as those for physicians, registered nurses, and dentists—are typically obtained after providing evidence of education and training; some require proof of passing written and/or clinical exams. Licenses allow individuals to provide a specific set of services that are considered to be within the limits of one's field, or "scope of practice". That is, licenses, for example, for physicians and registered nurses, allow them to practice neurotherapy that is considered within their area of specialty or scope of practice.
Sources: en.wikipedia.org
It is associated with the melanocortin receptor family, particularly subtypes found in the central nervous system. This interaction is separate from the adrenal pathway activated by full-length ACTH.
Peptidases degrade the compound within minutes in circulation. This short half-life is one reason nasal delivery is used, placing the substance close to the olfactory and trigeminal pathways.
No large multicenter trials have been published in English-language journals. The existing human evidence consists mainly of smaller studies conducted in Russia, which limits generalization.
It is described as a synthetic analogue of the ACTH(4–10) fragment, a short segment of adrenocorticotropic hormone. Its sequence differs from that fragment and includes two proline residues, which influence stability and behaviour in solution.