lyophilized powder comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2026-04-09. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C37H51N9O10S | Contains one methionine sulfur atom |
| Molecular mass | Approximately 814 Da | Consistent with a seven-residue peptide |
| Appearance | White to off-white powder | Typical lyophilized form |
| Solubility | Freely soluble in water | Also soluble in dimethyl sulfoxide |
| Typical storage | -20 °C, desiccated | Limits methionine oxidation |
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.
Claims about enhanced focus, memory, or mood in healthy people rest mostly on anecdotal reports and community discussion rather than on controlled data. It remains unclear whether any cognitive benefit observed in patients recovering from brain injury would extend to uninjured users. Dose-response relationships, long-term safety, and interactions with other drugs are not well characterized in the peer-reviewed literature. Questions about optimal route of administration and treatment duration likewise remain open.
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.
== 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).
Nicotinic acid adenine dinucleotide phosphate (NAADP) is a Ca2+-mobilizing second messenger synthesised in response to extracellular stimuli. Like its mechanistic cousins, IP3 and cyclic adenosine diphosphoribose (Cyclic ADP-ribose), NAADP binds to and opens Ca2+ channels on intracellular organelles, thereby increasing the intracellular Ca2+ concentration which, in turn, modulates sundry cellular processes (see Calcium signalling). Structurally, it is a dinucleotide that only differs from the house-keeping enzyme cofactor, NADP by a hydroxyl group (replacing the nicotinamide amino group) and yet this minor modification converts it into the most potent Ca2+-mobilizing second messenger yet described. NAADP acts across phyla from plants to humans.
While classical Jewish law neither requires nor prohibits the consumption of meat, Jewish vegetarians often cite Jewish principles regarding animal welfare, environmental ethics, moral character, and health as reasons for adopting a vegetarian or vegan diet. Rabbis may advocate vegetarianism or veganism primarily because of concerns about animal welfare, especially in light of the traditional prohibition on causing unnecessary "pain to living creatures" (tza'ar ba'alei hayyim). Some Jewish vegetarian groups and activists believe that the halakhic permission to eat meat is a temporary leniency for those who are not ready yet to accept the vegetarian diet. The book of Daniel starts in its first chapter with the benefits of vegetarianism. Due to its size, its late time of origin and its revealing content, the book is of particular importance for the time of the following exile, which lasts now for 2000 years and technically still goes on until the Temple in Jerusalem is rebuilt. A diet described as "pulse and water" is presented along benefits such as accordance with the biblical dietary laws, health, beauty, wisdom and vision. Vegetarianism can be seen as a safeguard around the dietary laws or the beautification of them. Jewish vegetarianism and veganism have become especially popular among Israeli Jews. In 2016, Israel was described as "the most vegan country on Earth", as five percent of its population eschewed all animal products. Interest in veganism has grown among both non-Orthodox and Orthodox Jews in Israel.
==== Malabsorption ==== Individuals with pernicious anemia do not have the ability to produce intrinsic factor. Individuals who lack intrinsic factor have no ability to absorb vitamin B12. The lack of intrinsic factor is most commonly due to autoimmune gastritis, which causes an autoimmune attack on the parietal cells that create it in the stomach. Antacid drugs that neutralize stomach acid, as well as acid-suppressing agents such as proton-pump inhibitors, can inhibit the absorption of vitamin B12 by preventing its release from food in the stomach. Other causes of B12 malabsorption include bariatric surgery, pancreatic insufficiency, obstructive jaundice, tropical sprue, celiac disease, inherited intrinsic factor deficiency, and radiation enteritis affecting the distal ileum. Age is also a contributing factor: elderly individuals are often achlorhydric due to reduced parietal cell function in the stomach, increasing their risk of vitamin B12 deficiency. The ability to absorb vitamin B12 declines with age, particularly in individuals over 60.
Sources: en.wikipedia.org
== Occurrence == Dimethyl trisulfide has been found in volatiles emitted from cooked onion, leek and other Allium species, from broccoli and cabbage, as well as from Limburger cheese, and is involved in the unpalatable aroma of aged beer and stale Japanese sake. It is a product of bacterial decomposition, including the early stages of human decomposition, and is a major attractant for blowflies looking for hosts. Dimethyl trisulfide along with dimethyl sulfide and dimethyl disulfide have been confirmed as volatile compounds given off by the fly-attracting plant known as dead-horse arum (Helicodiceros muscivorus). These flies are attracted to the odor of fetid meat and help pollinate this plant. DMTS contributes to the foul odor given off by the fungus Phallus impudicus, also known as the common stinkhorn. DMTS causes the characteristic malodorous smell of a fungating lesion, e.g., from cancer wounds, and contributes to the odor of human feces. DMTS can be synthesized by the reaction of methanethiol with hydrogen sulfide (in the presence of copper (II)) and with sulfur dichloride, among other methods:
=== Historical === In 1888, the French botanist Gaston Bonnier demonstrated early experimental evidence for lichen symbiosis through his work with X. parietina (then called Parmelia parietina). He reported creating artificial lichen thalli by replacing the organism's natural algal partner (Protococcus viridis) with different algae species, including Protococcus botryoides and the filamentous reddish alga Trentepohlia abietina. While his methods foreshadowed modern microbiological techniques and represented a significant step for the time, modern assessments note critical limitations. His algal sources were not truly isolated (coming from other lichen thalli), and his "synthesized lichens" only vaguely resembled natural specimens, showing fungal hyphae surrounding algal cells but lacking true lichen morphology. In 1967, Richardson conducted early transplant experiments with X. parietina that helped establish methods for studying lichen adaptability. Using a novel technique of attaching lichen thalli to new substrates with resin glue, the study achieved a 96% survival rate in transplanted specimens. When coastal specimens (var. ectanea) were moved to farm roofs in Oxford, they showed significant morphological changes within 18 months, including increased lobe width from 0.8 mm to 2.4 mm. The study also demonstrated that parietin production could adapt to local conditions within six months, with transplanted specimens eventually matching the pigment levels of native populations.
==== Warp Drive Bio ==== In 2012, Verdine founded Warp Drive Bio with cofounders George Church and James Wells. The company maps the genomes of soil-dwelling microbes in the search for potential treatments for drug-resistant ailments. In 2013, Verdine became full-time CEO of Warp Drive Bio, then handed the CEO position to Lawrence Reid in 2016 in order to found two new startups, FogPharma and LifeMine.
The northern and the western parts were reorganised as the Reichsgau Sudetenland, with the city of Reichenberg (present-day Liberec) established as its capital. Konrad Henlein (now openly an NSDAP member) administered the district first as Reichskommissar (until 1 May 1939) and then as Reichsstatthalter (1 May 1939 – 4 May 1945). The Sudetenland consisted of three administrative districts (Regierungsbezirke): Eger (with Karlsbad as capital), Aussig (Aussig) and Troppau (Troppau).
=== Inclusion of people of all genders in defining public health policies === Sociologist Monique Membrado observed in 2006 that women have been underrepresented in the formulation of major public health issues—including HIV, addiction, cardiovascular disease, and cancer—and particularly absent in occupational health discussions.
Sources: en.wikipedia.org
Gottron's papules are violaceous erythematous papules that commonly occur overlying the dorsal interphalangeal (DIP) or metacarpophalangeal joints (MCP), as well as the elbows or knee joints. They are found in approximately 70 percent of patients diagnosed with dermatomyositis.
=== Acetyl-l-carnitine === Acetylcarnitine levels were lower in depressed patients than controls and in rats it causes rapid antidepressant effects through epigenetic mechanisms. A systematic review and meta-analysis of 12 randomized controlled trials found "supplementation significantly decreases depressive symptoms compared with placebo/no intervention, while offering a comparable effect with that of established antidepressant agents with fewer adverse effects."
The flow through compressors, see schematic, is controlled by measuring the flow (FT) through the machine at the suction and controlling the speed (SC) of the prime mover (electric motor or gas turbine) that is driving the compressor. Anti-surge control ensures a minimum flow of fluid through the compressor. The flow (FT) at the discharge and measurements of the suction and discharge pressures (PT) and temperatures (TT) of the fluid flowing through the compressor are measured. The anti-surge controller (FIC) modulates a control valve (FCV) which recycles cooled gas from downstream of the compressor after-cooler back to the suction of the compressor. Low flow alarms (FAL) provide a warning indication to operating personnel.
List of lymphatic nodes of the human body American Society of Lymphology Glymphatic system and Meningeal lymphatic vessels - equivalent for the central nervous system Innate lymphoid cells Lymphangiogenesis Lymphangion Mononuclear phagocyte system Waldemar Olszewski – discovered fundamental processes in human tissues connected with function of the lymphatic system Trogocytosis
LECT2 Amyloidosis (ALECT2) is a form of amyloidosis caused by the LECT2 protein. It was found to be the third most common (~3% of total) cause of amyloidosis in a set of more than 4,000 individuals studied at the Mayo Clinic; the first and second most common forms the disorder were AL amyloidosis and AA amyloidosis, respectively. Amyloidosis is a disorder in which the abnormal deposition of a protein in organs and/or tissues gradually leads to organ failure and/or tissue injury. Although more than 30 different proteins can cause amyloidosis, the disorder caused by LECT2 is distinctive in three ways. First, it has an unusually high incidence in certain ethnic populations. Second, it is a systemic form of amyloidosis (i.e. amyloid deposited in multiple organs), as opposed to a localized form (amyloid deposits limited to a single organ) but nonetheless injures the kidney without or rarely injuring the other organs in which it is deposited. Third, LECT2 amyloidosis is diagnosed almost exclusively in elderly individuals. Given its relatively recent discovery, exceptionally strong ethnic bias, limitation to causing kidney disease, and restriction to elderly individuals, LECT2 amyloidosis appears at present to be an under-recognized cause of chronic kidney disease particularly in the ethnic groups that exhibit a high incidence of the disorder.
Sources: en.wikipedia.org
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.
Most published work uses intranasal administration, matching the route of the registered Russian formulation. Some animal experiments use intravenous or intraperitoneal injection. The route matters because the intact peptide is cleared rapidly from blood, so exposure differs between methods.
A purity value describes the share of the powder accounted for by the target peptide, usually by high-performance liquid chromatography. It does not confirm that the sequence is correct, which requires mass spectrometry or amino acid analysis. Purity and identity are separate checks.
Solid peptide is best kept frozen at about minus 20 degrees Celsius in a sealed container with desiccant. It should be allowed to reach room temperature before opening to prevent condensation. Repeated warming and cooling of the same vial is discouraged.