Everything below concerns peptide degradation. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-11-19. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
Published research has focused mainly on neurological and cognitive endpoints in animal models, with proposed mechanisms involving brain-derived neurotrophic factor and related signalling pathways. A substantial share of the human data originates from a limited number of research groups, and independent replication in other countries remains sparse. Regulatory status reflects that distribution: the peptide is registered as a medicine in Russia and appears in some neighbouring markets, while elsewhere it is handled as a research chemical without approved therapeutic labelling. Questions about dose-response relationships, long-term effects, and comparability across studies are still open.
Lyophilised powder is normally kept at -20 °C in a desiccated container, with some suppliers recommending -80 °C for long-term archival storage. Repeated freeze-thaw cycles are the most common cause of avoidable loss, so aliquoting before freezing reduces variability between working sessions. Dissolved peptide is far less stable than the dry solid and is usually prepared fresh or held briefly at 4 °C. Aqueous solutions support both hydrolysis of the backbone and oxidation of the N-terminal methionine, and these two routes dominate degradation under ordinary laboratory conditions.
| 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 |
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.
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.
Lyophilized material is chemically stable for extended periods when kept dry, cold, and protected from light. The powder is hygroscopic, so vials should be warmed to room temperature before opening to reduce condensation on the contents. Once dissolved, the peptide is far less stable because peptide bonds are susceptible to hydrolysis and the methionine residue can oxidize. Solutions are typically aliquoted and held at 2-8 °C for short intervals or frozen for longer ones, and repeated freeze-thaw cycles should be avoided.
Routine characterization relies on reversed-phase high-performance liquid chromatography to establish purity and on mass spectrometry to confirm molecular identity. Electrospray ionization and matrix-assisted laser desorption ionization are both used for mass verification. Amino acid analysis and peptide mapping can detect sequence errors. Common impurities include truncated sequences, methionine sulfoxide formed by oxidation, and deamidated products. Chromatograms are usually recorded near 214 nm, where the peptide backbone absorbs, and purity is reported as the percentage area of the principal peak.
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.
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.
Pharmacokinetic accounts emphasize rapid breakdown. After intravenous dosing the intact peptide disappears from blood within minutes, and nasal delivery produces low but measurable concentrations. Metabolites rather than the parent molecule may account for part of the observed activity, although the relative contribution is unresolved. Dosing in the literature varies widely and no optimal schedule has been agreed. These gaps are regularly cited as a reason the findings have not produced broad clinical adoption beyond the original research setting.
Proposed mechanisms center on neurotrophic signaling rather than on classical melanocortin receptor activation. Rodent experiments have reported shifts in the expression of brain-derived neurotrophic factor and nerve growth factor after administration, together with changes in the associated receptor systems. Several authors argue that the peptide acts largely through its degradation products and their interaction with peptidergic pathways, but this remains a hypothesis rather than a settled finding. No single molecular target has been identified in a way that the field broadly accepts.
Published research covers ischemic stroke, traumatic brain injury, cognitive impairment, optic nerve conditions and attention-related measures. Much of the human evidence comes from small trials conducted in one country, which limits how far the results generalize. Animal models supply the larger share of the data, and effects seen in rodents do not transfer automatically to people. Reviews have noted that methodological reporting is often incomplete, making it difficult to pool results or compare treatment schedules across studies.
=== Markers === Myofibroblasts usually stain for the intermediate filament vimentin, which is a general mesenchymal marker, α-smooth muscle actin (human gene = ACTA2), and for palladin, which is a cytoskeletal actin scaffold protein. They are positive for other smooth muscle markers, such as intermediate filament type desmin in some tissues, but may be negative for desmin in other tissues. Similar heterogeneous positivity may exist for almost every smooth muscle marker except probably a few which are positive only in contractile smooth muscles like metavinculin and smoothelin. Myofibroblasts upregulate the expression of fibronectin, collagens, and hyaluronic acid during and after their differentiation from fibroblasts. Among these, the EDA isoform of fibronectin (EDA-FN), and collagen type I (COL1A1/COL1A2) are typical markers of myofibroblast-dependent synthesis of pro-fibrotic extracellular matrix. Some myofibroblasts (especially if they have a stellate form) may also be positive for GFAP.
BeaverTails pastry (or Queues de Castor pâtisserie in Quebec) is a chain of pastry stands operated by BeaverTails Canada Inc. The chain's namesake product is a line of fried dough pastries, individually hand-stretched to resemble a beaver's tail. The chain began in Ottawa and now has franchises and licensees in six countries: Canada (Atlantic Canada, Ontario, Alberta, Manitoba, British Columbia and Quebec), the United States, Japan, France, U.A.E., and Mexico.
== Water and wastewater treatment == Microbubbles have been investigated as an aeration technology for water and wastewater treatment, where their long residence time, high specific surface area, and capacity to generate reactive oxygen species can improve gas-transfer efficiency and contaminant removal compared with conventional diffused aeration. Reviews of microbubble and nanobubble aeration have reported improvements in dissolved oxygen levels and biological oxygen demand removal in activated sludge processes when these technologies are applied in place of conventional aeration.
Sandalwood oil is an essential oil obtained from the steam distillation of chips and billets cut from the heartwood of various species of sandalwood trees, mainly Santalum album (Indian sandalwood) and Santalum spicatum (Australian sandalwood). Sandalwood oil is used in perfumes, cosmetics, sacred unguents, and as a mild food flavouring.
Psychosensory disturbances (impressions as being painful, annoying bright lights, odors intolerance causing nausea and vomiting, dizziness after sudden movements), Psychomotor disturbances (restlessness, tense and a desire to quarrel, increased preparedness for motor action), as well as Emotional disturbances Independently of clinical symptoms, blood level of tryptophan or urinary metabolites such as 2-pyridone/N-methylnicotinamide ratio less than two or NAD/NADP ratio in red blood cells can diagnose pellagra. The diagnosis is confirmed by rapid improvements in symptoms after doses of nicotinamide (250–500 mg/day) or nicotinamide-enriched food.
Sources: en.wikipedia.org
The period of Italian colonial rule saw the widespread adoption of pasta and lasagne, especially in the south. Tea and coffee are also really popular. Somalis were among the early adopters of coffee consumption, and Somali merchants were some of the first traders to export coffee beans. Somali coffee, known locally as 'Qahwo' and tea 'Shah', stand out due to their preparation method, which involves selecting various spices to enhance their flavour profile. 'Xalwo', which is closely associated with Omani 'Halwa', is a smooth jelly-like treat that is made with spices, seeds, nuts, and caramelised sugar. This confection is commonly served together with Somali 'Qahwo'. After meals, homes are traditionally perfumed using frankincense or incense (unsi), which is prepared inside an incense burner referred to as a dabqaad.
=== In space === The 2021 Plant Habitat-04 experiment aboard the International Space Station grew four chili plants in 137 days, producing twenty-six peppers across two harvests. Most were eaten by the crew; twelve were returned to Earth for study. The plants were a specially dwarfed variety of the Hatch cultivar. This was the "first generally recognized fruiting crop in space", following harvests of leaf crops such as lettuce and kale from 2014 onwards.
By micronizing progesterone, its particles are made smaller (mainly <10 μM) and its surface area is increased, thereby enhancing absorption from the intestines. Suspension and partial solubilization of progesterone in oil containing medium- to long-chain fatty acids likewise improves the bioavailability of oral progesterone. Progesterone is a lipophilic compound and it has been theorized that suspension of progesterone in oil may improve its absorption by the lymphatic system, thereby allowing a portion of oral progesterone to bypass the first pass through the liver and hence enhancing its bioavailability. Compared to plain milled progesterone, peak levels of progesterone following a single 200 mg oral dose were increased 1.4-fold by micronization, 1.2-fold by suspension in oil, and 3.2-fold by the combination of micronization and suspension in oil. Oral micronized progesterone suspended in oil is rapidly and almost completely absorbed from the intestines. There is wide interindividual variability in the bioavailability of oral progesterone. As progesterone was not used orally for many decades due to its poor bioavailability (until the introduction of oral micronized progesterone in oil-filled gelatin capsules in 1980), oral progestins (synthetic progestogens) with improved metabolic stability and high oral bioavailability were developed and have been used clinically instead. When oral progesterone is used at typical clinical dosages, only very low levels of progesterone are measured using reliable methods.
=== 9 May === Fourteen people were killed in RSF shelling on Abu Shouk camp. The Sudanese government ordered the shutdown of the Greater Nile Oil Pipeline carrying petroleum experts by South Sudan, citing RSF attacks.
Sources: en.wikipedia.org
Smitty's Family Restaurants opened their first location in 1960 and now operates 82 restaurants across Canada. Smitty's was one of the first ever franchise model restaurants in the country. Smitty's Restaurants are family owned and operated, and are known for their all day breakfast, lunch and dinner offerings. Their taglines of "All Your Favourites. All Day Long." and "Canada's Family Restaurant" are represented in a vast menu of choices for every age.
=== Political culture === In 1935, elections were reinstated, but only 1.8 per cent of the population was eligible to vote. In 1954, women won the right to vote. Since 1974, the party system in Belize has been dominated by the centre-left People's United Party and the centre-right United Democratic Party, although other small parties took part in all levels of elections in the past. Though none of these small political parties has ever won any significant number of seats or offices, their challenge has been growing over the years.
This was famously experienced by mountaineer Beck Weathers (who had undergone RK) during the 1996 Mount Everest disaster. Diurnal fluctuation: in a majority of patients who have undergone RK the cornea will steepen throughout the day. This can lead to variation in visual quality throughout the day.
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.
Reversed-phase HPLC gives the main purity figure, most often with UV detection near 214 nanometres. Mass spectrometry then confirms the molecular mass. Together the two methods distinguish a correct sequence from a closely related impurity.