Electrospray ionization 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.
Updated 2026-01-11. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
该化合物于二十世纪八十年代在俄罗斯被开发，相关工作由俄罗斯科学院分子遗传学研究所的研究团队主导。开发目标并非复制 ACTH 的完整激素活性，而是寻找保留其神经作用方向、同时去除促肾上腺皮质激素释放效应的短肽片段。研究记录显示，这一方向促成了多个相关短肽的合成与筛选，而 Semax 是其中被研究最广泛的一个。当地文献常以 Семакс 这一名称指代它。
研究兴趣主要集中在神经营养因子相关的路径上，包括脑源性神经营养因子与神经生长因子的表达变化。部分实验报告称在特定条件下观察到这些因子的水平上升，但具体信号通路和剂量依赖关系仍未完全厘清。多数公开数据来自细胞模型和动物实验，人体对照研究数量有限。因此，该化合物的作用机制在文献中属于活跃讨论，而非已经确立的定论。
| 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 |
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.
Verification of a supplied batch generally combines a certificate of analysis with independent testing, because certificates are self-reported documents. A typical package includes a chromatographic trace, a mass spectrum, and a stated water or counter-ion content. Batch-to-batch consistency matters more than a single purity figure when results are compared across experiments. No single mandatory standard governs research-grade peptide release, so laboratories are expected to define their own acceptance criteria. Residual trifluoroacetate from purification is a frequently overlooked counter-ion.
Clinical evidence consists largely of small trials with modest sample sizes, often without independent replication. Reported endpoints include cognitive scores, recovery after stroke, and visual function, but study designs vary widely and few trials meet contemporary reporting standards. Systematic reviewers have noted a high risk of bias in several of these reports. No large multicenter trial conducted outside Russia has been published. The compound is therefore best described as investigational in most jurisdictions, with its clinical role still unresolved.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. Its chain combines the first seven residues of corticotropin with a C-terminal proline-glycine-proline extension, a modification intended to slow enzymatic breakdown. The free peptide has a molecular mass near 813.9 daltons. It belongs to the class of ACTH-derived fragments studied for central nervous system activity rather than for adrenal steroid stimulation. This structural relationship to a natural hormone fragment is the usual starting point for describing the compound in the literature.
Development took place during the 1980s at institutes of the Russian Academy of Sciences, where peptide fragments of ACTH were screened for cognitive and neuroprotective effects. The compound received regulatory approval in Russia as a nasal preparation, marketed for conditions such as ischemic stroke, transient ischemic attacks, and optic nerve disorders. Registration in other countries has not followed. Most published clinical reports originate from a small number of Russian research groups, and independent replication outside that setting remains limited. The regulatory status therefore differs sharply between Russia and the rest of the world.
Identity and purity of Semax are established mainly by reversed-phase high-performance liquid chromatography coupled with mass spectrometry. The chromatographic trace gives a purity estimate as a percentage of total peak area, while electrospray or matrix-assisted laser desorption ionization confirms the molecular mass against the calculated value. Amino acid analysis and sequence-specific fragmentation provide further confirmation when a supplier's chain of custody is unclear. Vendors frequently quote a purity figure without stating the detection wavelength or the integration method, which limits how far one number can be compared with another.
Stability depends heavily on physical state. Lyophilized powder held dry, cold and dark retains its content over long periods, whereas dissolved peptide begins to change within days at room temperature. The most cited degradation route is oxidation of the methionine residue, which converts the peptide to a sulfoxide form that elutes differently on chromatography. Hydrolysis of amide bonds and adsorption onto container walls contribute smaller losses. Buffers that exclude oxygen from the headspace slow the oxidation pathway, but no single condition prevents all change indefinitely.
Practical handling follows from those properties. Bulk material is best divided into single-use portions soon after receipt, because each thaw exposes the whole container to moisture and temperature cycling. Vials should be allowed to reach room temperature before opening to prevent condensation on the powder. Low-binding plasticware reduces loss of dilute solutions, and sterile filtration is used when a preparation must remain free of microbial growth. Records of batch number, reconstitution date and storage history are what allow a later analytical result to be interpreted meaningfully.
GOT1/cAST, the cytosolic isoenzyme derives mainly from red blood cells and heart. GOT2/mAST, the mitochondrial isoenzyme is present predominantly in liver. These isoenzymes are thought to have evolved from a common ancestral AST via gene duplication, and they share a sequence homology of approximately 45%. AST has also been found in a number of microorganisms, including E. coli, H. mediterranei, and T. thermophilus. In E. coli, the enzyme is encoded by the aspCgene and has also been shown to exhibit the activity of an aromatic-amino-acid transaminase (EC 2.6.1.57).
== Early life == Born William Beckett on 10 September 1826, he was the third and second surviving son of Sir Edmund Beckett, 4th Baronet, of Grimthorpe, Yorkshire, and his wife Maria Beverley, daughter of William Beverley of Beverley. He was educated at Rugby School and Trinity College, Cambridge.
=== Adults and microwave ovens === A case of nerve damage by an exposure to radiation from a malfunctioning 600 watt microwave oven, operated for five seconds with the door open, with both arms and hands exposed, was reported. During exposure, there was a pulsating, burning sensation in all fingers. Erythema appeared on the back sides of both hands and arms. Four years later, denervation of median nerve, ulnar nerve, and radial nerve in both arms was shown on an electromyography test. The first microwave oven injury was reported in 1973. Two women operated a microwave oven in a department store snack bar. After several years, the oven showed a malfunction manifesting by burning the food. The first woman noticed burning sensations in her fingers and very little pain or tenderness when nearby to the operating oven. A small lesion appeared on her left index finger, near the base of the fingernail. In the next four weeks, three fingers of her right hand became affected as well. Transverse ridging and deformations close to the nail base appeared on her fingernails. After five months since the initial symptoms, she visited a doctor; the examination found no abnormalities other than the nails. Topical steroid cream used over six weeks led to gradual improvement. The second woman experienced nail deformation at the same time as the first one, with the same clinical findings. The oven was returned to the manufacturer before the involvement of the doctor, and the amount of leakage could not be assessed.
=== Iodine, bromine and kappa number === In measuring unsaturation in fatty acids, the traditional method is the iodine number. Iodine adds stoichiometrically to double bonds, so their amount is reported in grams of iodine spent per 100 grams of oil. The standard unit is a dimensionless stoichiometry ratio of moles double bonds to moles fatty acid. A similar quantity, bromine number, is used in gasoline analysis. In pulp and paper industry, a similar kappa number is used to measure how much bleaching a pulp requires. Potassium permanganate is added to react with the unsaturated compounds (lignin and uronic acids) in the pulp and back-titrated. Originally with chlorine bleaching the required quantity of chlorine could be then calculated, although modern methods use multiple stages. Since the oxidizable compounds are not exclusively lignin and the partially pulped lignin does not have a single stoichiometry, the relation between the kappa number and the precise amount of lignin is inexact.
Sources: en.wikipedia.org
== Background == The Easter Rising of 1916 and its aftermath caused a profound shift in public opinion towards the republican cause in Ireland. In the 1918 general election, the republican Sinn Féin party won a large majority of the Irish seats in the British parliament: 73 of the 105 constituencies returned Sinn Féin members (25 uncontested). The elected Sinn Féin MPs, rather than take their seats at Westminster, set up their own assembly, known as Dáil Éireann (Assembly of Ireland). It affirmed the formation of an Irish Republic and passed a Declaration of Independence. The subsequent War of Independence, fought between the Irish Republican Army (IRA) and British security forces, continued until July 1921 when a truce came into force. By this time the Parliament of Northern Ireland had opened, established under the Government of Ireland Act 1920, presenting the republican movement with a fait accompli and guaranteeing the British presence in Ireland. In October negotiations opened in London between members of the British government and members of the Dáil, culminating in the signing of the Anglo-Irish Treaty on 6 December 1921. The Treaty allowed for the creation of a separate state to be known as the Irish Free State, with dominion status, within the British Empire—a status equivalent to Canada. The Parliament of Northern Ireland could, by presenting an address to the king, opt not to be included in the Free State, in which case a Boundary Commission would be established to determine where the boundary between them should lie.
== Possible antineoplastic effects == Studies of the growth dynamics and metastasis of transplantable Lewis lung (LL) carcinoma in F1 (CBA x C57Bl/6j) mice have shown that lithium ascorbate exhibits moderate antitumor effects. Two series of experiments were carried out; the first series compared the effects of different doses of lithium ascorbate (5 and 10 mg/kg), and the second series compared the effects of lithium ascorbate and lithium carbonate when used at the same dose (5 mg/kg). An analysis of the dynamics of the LL tumor growth showed that both lithium salts already 3 days after the start of their use caused moderate (by 10-15%) inhibition of LL growth in tumor-bearing animals. At the same time, the effect of lithium ascorbate was more pronounced and stable: a statistically significant effect of this drug was observed from day 10 and throughout the entire observation period, and the TPO index was at a fairly high level (30-40%). The antitumor effect of lithium carbonate in this experiment was less pronounced (TPO=20-30%).
==== Norepinephrine ==== Similar to dopamine, amphetamine dose-dependently increases the level of synaptic norepinephrine, the direct precursor of epinephrine. Amphetamine is believed to affect norepinephrine analogously to dopamine. In other words, amphetamine induces competitive NET reuptake inhibition, TAAR1-mediated non-competitive reuptake inhibition and reverse transport at phosphorylated NET, CAMKIIα-mediated NET efflux independent of TAAR1, and norepinephrine release from VMAT2. In locus coeruleus norepinephrine neurons, TAAR1-dependent RhoA signaling promotes EAAT3 internalization and subsequent glutamate reuptake inhibition.
Sources: en.wikipedia.org
=== Colombia === The Military Forces of Colombia issues the Campaign Ration (Spanish: Ración de Campaña), a dark olive green plastic bag weighing between 1092 and 1205 grams and providing 3,097 to 3,515 kcal (12,960 to 14,710 kJ). Inside are the retort pouch main courses and supplements needed by a soldier for one day. The individual meals, which cater to South American tastes, consist of a breakfast, a lunch, and a main meal (Tamal, envueltos, lentils with chorizo, arvejas con carne, garbanzo beans a la madrileña, arroz atollado, ajiaco con pollo, and sudado con papas y carne). The ration also includes bread products, beverage mixes, candy and accessories. All items except the beverage mixes require no further preparation and can be eaten either hot or cold. The beverage powders must be mixed with hot or cold water before consumption. Each ration also contains raw sugar, a can of condensed milk, sandwich cookies, sweetened and thickened cream spread, hard candy or caramels, peanuts or trail mix or 25 g of roasted almonds, instant coffee, salt, paper towels, a plastic spoon, 2 water purification tablets, and a multivitamin tablet.
It is the object of various attitudes and emotions, such as concern for others as well as feelings of pity, envy, and ill will. Well-being is the state that egoists seek for themselves, and altruists aim to increase for others. Many disciplines examine or are guided by considerations of well-being, including ethics, psychology, sociology, economics, education, public policy, law, and medicine. The word well-being comes from the Italian term benessere. It entered the English language in the 16th century.
== AFL career == Lovett-Murray was initially rookie listed by Collingwood, playing for the Williamstown Seagulls in the Victorian Football League. After switching to the Bendigo Bombers, he was rookie listed by Essendon in the 2003 Rookie Draft. Lovett-Murray was promoted to the senior list early in the 2004 season and played 20 games. He spent the 2005 season on the rookie list again, he was promoted again that season and stayed on the senior list since then. In 2006, Lovett-Murray copped a three-game suspension from the AFL Tribunal for intentionally striking Fremantle midfielder Matthew Carr in the Bombers' round fourteen loss to the Dockers at Subiaco Oval. This was one of many lowlights for the club, which finished 15th at the end of the season with just three wins and one draw from 22 matches played. Lovett-Murray, along with 33 other Essendon players, was found guilty of using a banned performance-enhancing substance, thymosin beta-4, as part of Essendon's sports supplements program during the 2012 season. He and his team-mates were initially found not guilty in March 2015 by the AFL Anti-Doping Tribunal, but a guilty verdict was returned in January 2016 after an appeal by the World Anti-Doping Agency. He was suspended for two years which, with backdating, ended in December 2016; as a result, he served approximately fifteen months of his suspension and missed the entire 2016 season, when he had intended to play and coach for Rumbalara Football Club.
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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.
不是。Semax 是完全人工合成的七肽，自然界中没有对应的已知肽段。它的设计灵感来自促肾上腺皮质激素片段 ACTH(4-10)，但序列经过了替换和延长。