The short version of neurotrophic signaling fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-04-28. Anything still debated is marked as such rather than presented as settled.
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.
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.
Published research on this peptide originates mainly from Russian laboratories, and the wider international literature is comparatively thin. Studies have used rodent models of stroke, hypoxia, and memory tasks, with a smaller number of human trials reported. Reported outcomes include changes in attention and memory measures, along with effects on neurotrophic factor expression in some experiments. Small sample sizes, inconsistent dosing protocols, and limited independent replication are widely noted limitations, so the strength of the clinical evidence remains an open question.
Semax is a synthetic heptapeptide whose sequence is Met-Glu-His-Phe-Pro-Gly-Pro. The first four residues correspond to the ACTH(4-10) fragment, while the terminal Pro-Gly-Pro extension was added to improve metabolic stability. Its molecular formula is C37H51N9O10S and its monoisotopic mass is approximately 813.9 Da. The compound is classified as a peptide research chemical and as a registered pharmaceutical product in Russia, but it does not hold marketing approval in the European Union or the United States. Naming conventions vary across supplier catalogs.
Development of the compound took place in the Soviet Union during the 1980s, largely through peptide research groups affiliated with the Shemyakin-Ovchinnikov Institute and Moscow State University. Investigators screened fragments of adrenocorticotropic hormone for activity on the central nervous system while attempting to separate cognitive effects from hormonal ones. The shortened sequence was selected because it retained behavioral activity in animal models without stimulating corticosteroid release. Early publications described the molecule as an ACTH(4-10) analog.
| Property | Value | Notes |
|---|---|---|
| Primary research models | Rodent studies | Largest share of published data |
| Reported markers | BDNF and NGF expression | Measured mainly in animal tissue |
| Common administration | Intranasal | Matches the registered formulation |
| Blood residence time | Minutes | Rapid enzymatic degradation |
| Evidence quality | Small trials, limited replication | Noted repeatedly in reviews |
Identity and purity are established with standard peptide methods. Reversed-phase HPLC with ultraviolet detection near 214 nm resolves the parent peak from deletion and truncation byproducts, and reports typically quote a main-peak percentage. Mass spectrometry by electrospray or MALDI-TOF confirms the expected molecular mass, while amino acid analysis or peptide mapping can verify composition when the sequence itself is in question. A certificate of analysis that pairs a chromatogram with a mass spectrum is more informative than a purity figure alone. Counter-ion content and residual solvents are separate specifications and are frequently omitted.
Semax is normally supplied as a lyophilized powder, and that form is the most stable. Suppliers commonly recommend storage at -20 °C in a desiccated container protected from light, with short-term handling at room temperature limited to weighing and transfer. Powder that has absorbed moisture degrades faster, so vials should be warmed to ambient temperature before opening to prevent condensation on the contents. Hygroscopic behavior is typical of short hydrophilic peptides, and humidity control matters more than temperature alone for long-term retention.
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.
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.
PC PowerPlay wrote about the third episode: "It's based on ageing technology and it possibly runs a little too close to predictable (scare-wise) at times, but overall it hits just the right marks to make you want to keep on playing." Planet Half-Life said the third episode is about the same quality as the previous ones. PC Player said since the mod has different weapons, enemies, and textures from Half-Life, it creates a "unique splatter atmosphere". IGN wrote about the series: "The real pull They Hunger provides is it's absolutely, shockingly, brilliant freakiness. Everything, and I do mean everything about the game is scary." Hacker recommended the mod to fans of Half-Life and horror games. Click! said the mod has an incredible horror atmosphere and is at the absolute top of first-person horror games. The Games Machine called They Hunger a trio of classic single-player mods. In 2018, PC Gamer wrote: "What made They Hunger stand out, and what makes it stand out today, is how the quality of its level and setpiece design rivals that of the game it's based upon."
Treatments include dietary changes emphasizing low glycemic index food, physical activity to improve insulin sensitivity, and medications that (1) increase the amount of insulin secreted by the pancreas, (2) increase the sensitivity of target organs to insulin, (3) decrease the rate at which glucose is absorbed from the gastrointestinal tract, and (4) increase the loss of glucose through urination. Several drug classes are indicated for use in type 2 diabetes and are often used in combination. Therapeutic combinations may include several insulin isoforms or varying classes of oral antihyperglycemic agents. As of 2020, 23 unique antihyperglycemic drug combinations were approved by the FDA. The first triple combination of oral anti-diabetics was approved in 2019, consisting of metformin, saxagliptin, and dapagliflozin. Another triple combination approval for metformin, linagliptin, and empagliflozin followed in 2020.
=== Unnatural amino acid incorporation === Cell-free systems have also been used to incorporate unnatural amino acids. Shimizu et al. were able to change a stop codon to a sense codon by omitting the RF1 release factor, indicating ability to insert desired amino acids in unnatural situations. This is of use in systems where working inside a cell is problematic, such as the process of amino acid metabolism preventing specific labelling of amino acids that would be useful in multidimensional NMR spectroscopy. Kigawa et al.were able to successfully label amino acids in a cell-free system where amino acid metabolism was no longer present, thus making such systems useful to NMR studies.
Two years prior, the French had refused Ho's proposal of a similar status within the French Union, albeit with some restrictions on French power and the latter's eventual withdrawal from Vietnam. However, they were willing to deal with Bảo Đại as he represented a non-radical option who could rally behind him the non-Communist nationalist movement. In January 1950, France officially recognized the nominal "independence" of the unified State of Vietnam, led by Bảo Đại, as an associated state within the French Union. However, France still controlled all foreign policy, every defense issue and would have a French Union army stationed in the country with complete freedom of movement. Within the framework of the French Union, France also granted independence to the other nations in Indochina, the Kingdoms of Laos and Cambodia. In January 1949, the Vietnamese National Army was created to go along the formation of the new Vietnamese associated state. This was meant to bolster French numbers as their army found itself outnumbered by the People's Army of Vietnam at this point in the war. To this end, the CEFEO provided some of its officers to lead these new divisions.
Ceftaroline has low water solubility but this problem was overcome by attaching a N-phosphonoamino group to the molecule making the intravenous prodrug ceftaroline fosamil. The prodrug is dephosphorylated in plasma to form active ceftaroline.
Sources: en.wikipedia.org
Protein adsorption is a process that has a fundamental role in the field of biomaterials. Indeed, biomaterial surfaces in contact with biological media, such as blood or serum, are immediately coated by proteins. Therefore, living cells do not interact directly with the biomaterial surface, but with the adsorbed proteins layer. This protein layer mediates the interaction between biomaterials and cells, translating biomaterial physical and chemical properties into a "biological language". In fact, cell membrane receptors bind to protein layer bioactive sites and these receptor-protein binding events are transduced, through the cell membrane, in a manner that stimulates specific intracellular processes that then determine cell adhesion, shape, growth, and differentiation. Protein adsorption is influenced by many surface properties such as surface wettability, surface chemical composition, and surface nanometre-scale morphology. Surfactant adsorption is a similar phenomenon, but utilising surfactant molecules in the place of proteins.
=== 5 April === Ukraine launched a barrage of drones into western Russia, targeting four airbases. Ukrainian officials claim at least six military aircraft were destroyed, eight others were "heavily damaged", and at least 20 personnel were killed or injured at a military airbase near Morozovsk, Rostov Oblast. Security sources reported the airbase held Su-27 and Su-34 aircraft, while an open-source intelligence researcher reported the base also held three Su-35 aircraft. Rostov Oblast Governor Vasily Golubev claimed Russia intercepted 44 Ukrainian drones and that only a 16-storey residential block and power substation were damaged, leaving around 600 people without power. Eight people were later injured by one of the fallen drone's explosives detonating during an investigation of the site. Drones were also launched at Engels-2 airbase in Saratov Oblast, reportedly home to Tu-95 and Tu-22 bombers. The attack allegedly caused "serious damage" to three Tu-95MS bombers and resulted in the deaths of seven. One drone was shot down over the nearby town of Engels. There were no reports of casualties or infrastructure damage from the neutralized drone. Yeysk Airport, which hosts the aviation units of the 4th Army of the Russian Air Force, was also allegedly struck, with four Russians killed and two Su-25 aircraft destroyed. Local official Roman Bublik denied any damage. Kursk Vostochny Airport was also targeted. There was no information provided on possible damage. Russia reported no casualties and denied any serious damage, claiming to have intercepted 53 drones.
== Undergraduate Research Program == The College of Science and Technology offers the CST Undergraduate Research Program (URP). Students selected to participate work with a faculty sponsor to perform research in the faculty member's lab. Students may be asked to participate in conferences, author papers or to showcase their research work in the department or at the URP Research Symposium.
== Sources == Almalki, T.M.A.; Alshammari, F.O. NURSING CARE IN RENAL FAILURE. JEC PUBLICATION. ISBN 978-93-6175-429-6. Retrieved 2025-01-21. Liu, Chenbin; Tsow, Francis; Shao, Dangdang; Yang, Yuting; Iriya, Rafael; Tao, Nongjian (2016). "Skin Mechanical Properties and Hydration Measured With Mobile Phone Camera". IEEE Sensors Journal. 16 (4): 924–930. Bibcode:2016ISenJ..16..924L. doi:10.1109/JSEN.2015.2492241. ISSN 1530-437X. Saavedra, Jose M. (1991-03-01). "Capillary Refilling (Skin Turgor) in the Assessment of Dehydration". Archives of Pediatrics & Adolescent Medicine. 145 (3): 296–298. doi:10.1001/archpedi.1991.02160030064022. ISSN 1072-4710. PMID 2003478.
Another Tyrannosaurus, nicknamed Stan (NHMAD 2020.00001, formerly BHI 3033), in honor of amateur paleontologist Stan Sacrison, was recovered from the Hell Creek Formation in 1992. Stan is the second most complete skeleton found, with 199 bones recovered representing 70% of the total. This tyrannosaur also had many bone pathologies, including broken and healed ribs, a broken and healed neck, and a substantial hole in the back of its head, about the size of a Tyrannosaurus tooth. In 1998, 20-year-old Bucky Derflinger noticed a T. rex toe exposed above ground, making him the youngest person to discover a Tyrannosaurus. The specimen, dubbed Bucky in honor of its discoverer, was a young adult, 3.0 metres (10 ft) tall and 11 metres (35 ft) long. Bucky is the first Tyrannosaurus to be found that preserved a furcula (wishbone). Bucky is permanently displayed at The Children's Museum of Indianapolis.
Sources: en.wikipedia.org
== Biochemistry == Pyruvate is important in biochemistry. It is the output of the metabolism of glucose known as glycolysis. One molecule of glucose breaks down into two molecules of pyruvate, which are then used to provide further energy, in one of two ways. Pyruvate is converted into acetyl-coenzyme A, which is the main input for a series of reactions known as the Krebs cycle (also known as the citric acid cycle or tricarboxylic acid cycle). Pyruvate is also converted to oxaloacetate by an anaplerotic reaction, which replenishes Krebs cycle intermediates; also, the oxaloacetate is used for gluconeogenesis. These reactions are named after Hans Adolf Krebs, the biochemist awarded the 1953 Nobel Prize for physiology, jointly with Fritz Lipmann, for research into metabolic processes. The cycle is also known as the citric acid cycle or tricarboxylic acid cycle, because citric acid is one of the intermediate compounds formed during the reactions. If insufficient oxygen is available, the acid is broken down anaerobically, creating lactate in animals and ethanol in plants and microorganisms (and in carp). Pyruvate from glycolysis is converted by fermentation to lactate using the enzyme lactate dehydrogenase and the coenzyme NADH in lactate fermentation, or to acetaldehyde (with the enzyme pyruvate decarboxylase) and then to ethanol in alcoholic fermentation. Pyruvate is a key intersection in the network of metabolic pathways. Pyruvate can be converted into carbohydrates via gluconeogenesis, to fatty acids or energy through acetyl-CoA, to the amino acid alanine, and to ethanol.
After receiving a missile targeting device disguised as a gem from Agent Abrella, she travels to Earth in the Kaijuki Devil Capture 5 (デビルキャプチャー5, Debiru Kyapuchā Faibu), which is destroyed by Deka Bike Robo while she is captured by S.P.D.'s Earth unit. She escapes to rekindle a former relationship, but is confronted by the Dekarangers and learns of Abrella's true intentions. Once the Dekarangers stop the missile and jettison Faraway to safety, she is pardoned. Faraway is portrayed by Aja (あじゃ). Tokasaian Princess Io Yonmerluicchi (トカーサ星人イオ・ヨンマールイッチ, Tokāsa Seijin Io Yonmāruitchi): A princess from Planet Tokasa who resembles Umeko. Io Yonmerluicchi is portrayed by Mika Kikuchi, who also portrays Umeko. Chanbenarian Gin (チャンベーナ星人ギン, Chanbēna Seijin Gin): A feline alien child from Planet Chanbenar who tries to steal medicine from Hakutaku, for his sick mother, after he was unable to buy it with a pearl he found, but is stopped and befriended by Sen-chan. After surviving an attempt on his life by an Alienizer named Gineka, who used the pearl in his Kaijuki game, Gin's mother receives medicine from Hakutaku at Sen-chan's request. Gin is voiced by Yōko Teppōzuka (鉄炮塚 葉子, Teppōzuka Yōko). Teranian Chou San (テラン星人チョウ・サン, Teran Seijin Chō San): A retired veteran detective from Planet Teran who seeks revenge on an Alienizer named Raja Namunan for killing his daughter 13 years prior, but was never able to prove it. In the present, Jasmine shows him the errors of his ways while confirming his theory. Chou San is voiced by Seizō Katō (加藤 精三, Katō Seizō).
==== Teenage mode ==== China heavily regulates how Douyin is used by minors in the country, especially after 2018. Under government pressure, ByteDance introduced parental controls and a "teenage mode" that shows only whitelisted content, such as knowledge sharing, and bans pranks, superstition, dance clubs, and pro-LGBT content. A mandatory screen time limit was put in place for users under the age of 14 and a requirement to link accounts to a real identity to prevent minors from lying about their age or using an adult's account. The differences between Douyin and TikTok have led some US politicians and commentators to accuse the company or the Chinese government of malicious intent. In March 2023, TikTok announced default screen time limits for users under the age of 18. Those under the age of 13 would need a passcode from their parents to extend their time.
== Criteria == The King's College criteria were described in a seminal publication in 1989 by J.G. O'Grady and colleagues from King's College School of Medicine. 588 patients with acute liver failure who presented to King's College Hospital from 1973 to 1985 were assessed retrospectively to determine if there were particular clinical features or tests that correlated poorly with prognosis. The criteria were stratified into acetaminophen and non-acetaminophen causes of acute liver failure, due to the different operating characteristics of parameters correlating with prognosis in the two causes.
=== Bifurcated and over-coordinated hydrogen bonds in water === A single hydrogen atom can participate in two hydrogen bonds. This type of bonding is called "bifurcated" (split in two or "two-forked"). It can exist, for instance, in complex organic molecules. It has been suggested that a bifurcated hydrogen atom is an essential step in water reorientation. Acceptor-type hydrogen bonds (terminating on an oxygen's lone pairs) are more likely to form bifurcation (it is called overcoordinated oxygen, OCO) than are donor-type hydrogen bonds, beginning on the same oxygen atom's hydrogen atoms.
Sources: en.wikipedia.org
The main proposal is modulation of neurotrophic factors such as brain-derived neurotrophic factor, supported largely by animal experiments. Receptor-level targets have not been firmly established. Most reviews describe the mechanism as only partially characterized.
The compound is registered as a medicine in Russia, so clinical work has concentrated there. Trials elsewhere are few and generally small. This geographic concentration is a recognized limitation in evidence reviews.
Some fraction may reach the central nervous system through olfactory pathways, and this is often cited as the rationale for the nasal route. The size of that fraction in humans is not well quantified. Blood concentrations after nasal dosing are low, which complicates measurement.
It is a synthetic peptide of seven amino acids. Its backbone corresponds to a fragment of adrenocorticotropic hormone extended at the carboxyl end. The material is distributed as a lyophilized solid for laboratory use.