Everything below concerns Electrospray ionization. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-06-05. 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.
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.
From 1948 to 1994, international rugby relations with apartheid South Africa, and also the non-integrated nature of rugby within the country drew frequent controversy. South Africa remained a member of the International Rugby Board (IRB) throughout the apartheid era. Halt All Racist Tours was established in New Zealand in 1969 to oppose continued tours to and from South Africa. Though contacts were restricted after the Gleneagles Agreement in 1977, there were controversial tours in 1980 by the British Lions and by France, in 1981 by Ireland, and in 1984 by England. South Africa toured New Zealand in 1981. South Africa were excluded from the first two Rugby World Cups, in 1987 and 1991. Racially selected New Zealand sports teams toured South Africa until the 1970 All Blacks rugby tour allowed Māori to go under the status of 'honorary whites'. The issue affected not only black South Africans, but also indigenous New Zealanders and to a lesser extent indigenous Australians. Many major rugby union international sides had few non-white players, but theoretically, a side such as Fiji would have been frowned upon. Apartheid South Africa's last foreign tour was to New Zealand in 1981, prior to the system's dismantlement in 1991 and new elections in 1994.
Every dollar earned is just as valuable to happiness up to a $75,000 annual income, thereafter, the value of each additional dollar earns a diminishing amount of happiness. According to the latest systematic review of the economic literature on life satisfaction, one's perception of their financial circumstances fully mediates the effects of objective circumstances on one's well-being. People overestimate the influence of wealth by 100%. Professor of Economics Richard Easterlin noted that job satisfaction does not depend on salary. In other words, having extra money for luxuries does not increase happiness as much as enjoying one's job or social network. Gilbert is thus adamant, people should go to great lengths to figure out which jobs they would enjoy, and to find a way to do one of those jobs for a living (that is, provided one is also attentive to social ties). Unemployment is detrimental to individual well-being. However, that does not hold true in countries where unemployment is widespread. Psychology Today reports that the impact of unemployment is dampened in those for whom work is less central to their identity, those who receive less criticism and less negative judgments from others, those who can meet their immediate financial obligations and those who do not see their unemployment as high stress and negative. Other protective factors include the expectation of reemployment, routines that structure one's time and evaluating oneself as worthy, competent and successful.
=== Reproduction === Many marine organisms use pheromones as chemical cues alerting possible mates that they are ready to reproduce. For example, male sea lampreys attract ovulating females by emitting a bile that can be detected many meters downstream. Other processes can be more complex, such as the mating habits of crabs. Due to the fact that female crabs can only mate during a short period after moults from her shell, female crabs produces pheromones before she begins to moult in order to attract a mate. Male crabs will detect these pheromones and defend their potential mate until she has finished molted. However, due to the cannibalistic tendencies of crabs, the female produces an additional pheromone to suppresses cannibalistic instincts in her male guardian. These pheromones are very potent—so much so that they can induce male crabs to try to copulate with rocks or sponges that have been coated in pheromone by researchers. Furthermore, compound structure plays a key role, e.g. crab pheromones are specialized to travel in aquatic vs terrestrial environments.
Space manufacturing or In-space manufacturing (ISM in short) is the fabrication, assembly or integration of tangible goods beyond Earth's atmosphere (or more generally, outside a planetary atmosphere), involving the transformation of raw or recycled materials into components, products, or infrastructure in space, where the manufacturing process is executed either by humans or automated systems by taking advantage of the unique characteristics of space. Synonyms of Space/In-space manufacturing are In-orbit manufacturing (since most production capabilities are limited to low Earth orbit), Off-Earth manufacturing, Space-based manufacturing, Orbital manufacturing, In-situ manufacturing, In-space fabrication, In-space production, etc. In-space manufacturing is a part of the broader activity of in-space servicing, assembly and manufacturing (ISAM) and is related to in situ resource utilization (ISRU). Three major domains of In-space manufacturing are ISM for space (space-for-space) where products remain in space, ISM for Earth (space-for-Earth) where goods with improved properties produced in outer-space microgravity are transported back to Earth, and ISM for surface where goods are produced on or sent to surfaces of celestial bodies like the Moon, Mars, and asteroids.
Sources: en.wikipedia.org
== Biological properties == Ionophores are widely used in cell physiology experiments and biotechnology as these compounds can effectively perturb gradients of ions across biological membranes and thus they can modulate or enhance the role of key ions in the cell. Many ionophores have shown antibacterial and antifungal activities. Some of them also act against insects, pests and parasites. Some ionophores have been introduced into medicinal products for dermatological and veterinary use. A large amount of research has been directed toward investigating novel antiviral, anti-inflammatory, anti-tumor, antioxidant and neuroprotective properties of different ionophores. Chloroquine is an antimalarial and antiamebic drug. It is also used in the management of rheumatoid arthritis and lupus erythematosus. Pyrithione is used as an anti-dandruff agent in medicated shampoos for seborrheic dermatitis. It also serves as an anti-fouling agent in paints to cover and protect surfaces against mildew and algae. Clioquinol and PBT2 are 8-hydroxyquinoline derivatives. Clioquinol has antiprotozoal and topical antifungal properties, however its use as an antiprotozoal agent has widely restricted because of neurotoxic concerns. Clioquinol and PBT2 are currently being studied for neurodegenerative diseases, such as Alzheimer's disease, Huntington's disease and Parkinson's disease. Gramicidin is used in throat lozenges and has been used to treat infected wounds. Epigallocatechin gallate is used in many dietary supplements and has shown slight cholesterol-lowering effects.
On 4 March, at the Extraordinary Arab Summit in Cairo on Developments in the Palestinian Issue, Arab leaders adopted a $53 billion plan proposed by Egypt that did not involve displacing Palestinians from the Strip. The plan was to create an interim committee of "independent, professional Palestinian technocrats" to govern Gaza to prepare for the Palestinian Authority’s return. Hamas said that it would not bring its own candidates to the proposed governing committee but that it would need to give its permission in regards to the committee’s tasks, members and agenda. Mahmoud Abbas said that he would be prepared to hold elections, which Hamas welcomed. The summit released an AI-enhanced presentation showing modern housing developments, as well as blueprints for resorts and attractions. The plan was to seek international funding. The plan outlines a six-month phase of recovery providing temporary housing for 1.5 million displaced Palestinians within seven sites in Gaza, followed by a two-stage reconstruction program: a two-year first stage of $20 billion and a 2.5 year second stage of $30 billion. The New York Times reported the funding for the plan remains unclear as Gulf states will be reluctant to invest in rebuilding Gaza only to see it destroyed again if violence returns. The Israeli foreign ministry said the plan had "outdated" outlooks and rejected the plan's dependence on the Palestinian Authority, adding that Hamas would be given power by the plan.
== External links == WHO: China—World Health Organization Country Profile WHO: China Office—World Health Organization China Office (in Chinese) 乙肝·论坛·乙肝病毒携带者的网上家园-肝胆相照—"In the Hepatitis Camp" (in English) Hepatitis B Carriers BBS—"In the Hepatitis Camp"
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。