A practical reference on Semax: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2025-08-06 and is reviewed periodically as new material appears.
The proposed mechanism centres on neurotrophic signalling rather than direct receptor activation. Semax is reported to increase expression of brain-derived neurotrophic factor and nerve growth factor in several brain regions, and to shift the balance between excitatory and inhibitory neurotransmitter systems. Interaction with melanocortin receptors has been suggested because of the parent ACTH fragment. Many of these findings come from rodent studies, and the extent to which they translate to human physiology remains an open question.
Scientific literature on semax is unevenly distributed. A substantial share of published work originates from a small number of laboratories in Russia, while independent replication elsewhere is limited. Human data consist mostly of small trials with short follow-up, and several reported outcomes rely on subjective rating scales. Questions about how much intact peptide reaches the central nervous system after nasal administration, and how long it persists there, are still unresolved. The compound is best described as an active research subject rather than a settled pharmacological agent.
纯度评估以反相高效液相色谱为主，通过主峰面积百分比给出粗略结果，再配合电喷雾质谱核对分子量。氨基酸分析可验证组成比例，手性色谱或毛细管电泳用于检查残基构型。常见杂质包括缺失序列的短肽、氧化产物与二聚体。由于多数市售品不附带完整检验报告，独立第三方检测常被用来核实标称值。
从分子层面看，Semax 是线性七肽，没有二硫键、糖基或脂链修饰，N 端为游离氨基，C 端为游离羧基。分子含组氨酸与谷氨酸侧链，因此在水和甲醇等极性溶剂中溶解良好，在非极性溶剂中溶解有限。计算分子量约为 814 Da，与其质子化离子的质荷比吻合，可用于质谱确认。
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C37H51N9O10S | Calculated for the free peptide |
| Molar mass | 813.9 g/mol | Anhydrous free base |
| Peptide class | Synthetic heptapeptide | ACTH(4-10) analogue |
| Parent fragment | ACTH(4-10) | Adrenocorticotropic hormone segment |
| Developmental origin | Institute of Molecular Genetics, Moscow | Work began in the 1980s |
Russian regulatory authorities approved the peptide for nasal administration, and it remains listed in the national pharmacopoeia under several trade names. Documented indications include acute ischemic stroke, transient ischemic attacks, traumatic brain injury, and certain ophthalmological and neurological conditions. Physicians also prescribe it for cognitive complaints in older patients, although the evidence base for that use is thinner. Outside Russia and a few neighboring states, the substance is not an approved medicine and is sold instead as a research chemical.
Later generations of the molecule include an N-acetylated form and an amidated form, both marketed online alongside the parent peptide. These variants differ in terminal chemistry and stability, and they are frequently discussed in the same breath even though they have not been compared in controlled trials. Supply outside formal healthcare systems comes largely from laboratories that synthesize peptides to order. Purity and identity of these materials vary widely, and no single body oversees the international trade.
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.
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.
=== LSD substitute overdose === Although LSD is relatively safe in overdose, 25-NB (NBOMe) psychedelics like 25I-NBOMe and 25B-NBOMe are often sold as "LSD" and are highly toxic in overdose, with many reported severe intoxications and deaths. Owing to their high potency analogous to LSD, these drugs are also regularly sold as "LSD" in blotter papers. Fatalities involved in NBOMe intoxication suggest that a significant number of individuals ingested the substance which they believed was LSD, and researchers report that "users familiar with LSD may have a false sense of security when ingesting NBOMe inadvertently". Researchers state that the alleged physiological toxicity of LSD is likely due to psychoactive substances other than LSD. NBOMe compounds are reported to have a bitter taste, are not active orally, and are usually taken sublingually. When NBOMes are administered sublingually, numbness of the tongue and mouth followed by a metallic chemical taste was observed, and researchers describe this physical side effect as one of the main discriminants between NBOMe compounds and LSD. Despite its high potency, recreational doses of LSD have only produced low incidents of acute toxicity, but NBOMe compounds have extremely different safety profiles. Testing with Ehrlich's reagent gives a positive result for LSD and a negative result for NBOMe compounds.
where ± refers to a positive or negative particle, Ip is the incident ion current, f±i is the fraction of particles sputtered as ions, Si is the sputtering yield of both ions and neutrals, Ci is the concentration of the ith element (corrected for isotopic abundance) in the sputtered volume, ηi is the collection efficiency of the SIMS instrument, Ip = d2j/4, d is the diameter of a Gaussian-shaped beam, and j is the current density.
It can also cause sexual side effects, galactorrhoea, infertility, gynecomastia, and, with chronic use, reduced bone mineral density leading to breaks, all of which are associated with increased prolactin secretion. Alpha α1 adrenergic receptors: This action accounts for the orthostatic hypotensive effects and perhaps some of the sedating effects of risperidone. Alpha α2 adrenergic receptors: Risperidone's action at these receptors may cause greater positive, negative, affective, and cognitive symptom control. Histamine H1 receptors: effects on these receptors account for its sedation and reduction in vigilance. This may also lead to drowsiness and weight gain. 5-HT2A receptor: Risperidone’s atypicality is relatively strong in terms of its binding preference for 5-HT2A receptors over dopamine D2 receptors. However, clozapine is generally considered stronger in this regard. Clozapine differs in that it has lower overall receptor affinity compared to some other atypical antipsychotics, but still maintains an approximate 4-fold higher affinity for 5-HT2A receptors relative to D2 receptors. Among three atypical antipsychotics often noted for significant 5-HT2A receptor blockade (risperidone, olanzapine, and clozapine), risperidone shows the highest degree of receptor occupancy in a dose-dependent comparison. At approximately 20 mg risperidone and 6 mg olanzapine, reported receptor occupancies are around 93–95%, respectively. Clozapine ranks third when compared using chlorpromazine equivalents.
They found it rarely included effective methods, was mostly generic, and was rarely tailored to patients' existing knowledge and behaviours. 14 December A WHO study comprehensively estimates excess deaths from the COVID-19 pandemic during 2020 and 2021, concluding ~14.8 million excess early deaths occurred, reaffirming their prior calculations from May as well as updating them, addressing criticisms. These numbers do not include measures like years of potential life lost, far exceed the 5.42 million officially reported deaths, may make COVID-19 2021's leading cause of death, and are similar to the ~18 million estimated by another study (see 10 Mar). Microbiome research: Researchers report the discovery of a gut–brain connection in mice that regulates motivation for exercise and can enhance performance by augmenting dopamine signalling during physical activity. A microbiome-wide association study associates thirteen microbial taxa with depressive symptoms (6 Dec). Scientists report that and how – including transfer of mobile genetic elements and infant diet – the maternal microbiome shapes offspring gut microbiomes as fetus and infant (22 Dec). A first global review summarizes scarce data on a likely largely declining "experience of nature" and nature-disconnection which prior studies suggest have impacts on health and proenvironmental behavior.
This field is highly localized at the nanoparticle and decays rapidly away from the nanoparticle/dielectric interface into the dielectric background, though far-field scattering by the particle is also enhanced by the resonance. Light intensity enhancement is a very important aspect of LSPRs and localization means the LSPR has very high spatial resolution (subwavelength), limited only by the size of nanoparticles. Because of the enhanced field amplitude, effects that depend on the amplitude such as magneto-optical effect are also enhanced by LSPRs.
Sources: en.wikipedia.org
=== Municipal politics (2025–2026) === On September 17, 2025, Findlay became the advisory board chair of the Conservative Electors Association, a newly formed municipal party in British Columbia. Her role was to help with candidate recruitment and policy development. In February 2026, Findlay was involved in a launch event for the Conservative Electors Association, where they announced the slate of candidates for the 2026 Surrey municipal election.
); rather, it depends on the orchestrated activity of SOM components. The distinct spatial distribution of these proteins—observed both on coral skeletons and in coral cell cultures—underscores their specific and diverse roles in directing crystal nucleation, growth, and overall skeletal architecture.
== Criticisms of the classification == William I. Newman and Carl Sagan believe that the growth of energy consumption alone cannot describe the evolution of civilizations; it is also necessary to consider population growth, and in particular the fact that it can be limited by the transport capacity of interplanetary means of travel. They conclude that there can be no ancient civilizations of galactic dimensions, nor galactic empires, although the possibility of networks of colonized worlds (of about 5 to 10 planets) is strong. The scale theorized by Kardashev was born in the geopolitical context of the Cold War, in which energy had supreme value. According to Guillermo A. Lemarchand, a physicist at the University of Buenos Aires, there are four arguments against Kardashev's classification:
=== In vivo histology === There is interest in developing techniques for in vivo histology (predominantly using MRI), which would enable doctors to non-invasively gather information about healthy and diseased tissues in living patients, rather than from fixed tissue samples.
Sources: en.wikipedia.org
== Post-1918 House of Hohenzollern == The German Revolution of 1918–1919 dissolved both the constituent German monarchies and the federal compact that created the office of German Emperor. Under Article 109 of the 1919 Weimar Constitution, the legal privileges of the nobility were abolished, ending the constitutional basis for individual monarchical titles and eliminating the legal basis for the imperial federal office. For their part, in late 1918, both Wilhelm II and his heir formally renounced all succession rights. In his formal deed of abdication signed at Amerongen on 28 November 1918, Wilhelm II declared that he renounced "for all time claims to the throne of Prussia and to the German Imperial throne connected therewith." Crown Prince Wilhelm similarly executed a deed of renunciation on 1 December 1918, forfeiting his succession rights to both the Prussian and imperial crowns. After 1918, the House of Hohenzollern continued to use its traditional dynastic house laws primarily to govern the succession of family trusts and private estate inheritance. In 2004, the Federal Constitutional Court of Germany confirmed that these historical house laws possess no public-law standing and operate strictly within the framework of private civil law, with headship of the family functioning as a private lineage rather than a constitutional office.
In its simplest form, nutrient-enriched water is pumped into containers with plants in a growing medium such as Expanded clay aggregate At regular intervals, a simple timer causes a pump to fill the containers with nutrient solution, after which the solution drains back down into the reservoir. This keeps the medium regularly flushed with nutrients and air.
===== Process ===== A large fraction of human tumor mutations are effectively patient-specific. Therefore, neoantigens may also be based on individual tumor genomes. Deep-sequencing technologies can identify mutations within the protein-coding part of the genome (the exome) and predict potential neoantigens. In mice models, for all novel protein sequences, potential MHC-binding peptides were predicted. The resulting set of potential neoantigens was used to assess T cell reactivity. Exome–based analyses were exploited in a clinical setting, to assess reactivity in patients treated by either tumor-infiltrating lymphocyte (TIL) cell therapy or checkpoint blockade. Neoantigen identification was successful for multiple experimental model systems and human malignancies. The false-negative rate of cancer exome sequencing is low—i.e.: the majority of neoantigens occur within exonic sequence with sufficient coverage. However, the vast majority of mutations within expressed genes do not produce neoantigens that are recognized by autologous T cells. As of 2015 mass spectrometry resolution is insufficient to exclude many false positives from the pool of peptides that may be presented by MHC molecules. Instead, algorithms are used to identify the most likely candidates. These algorithms consider factors such as the likelihood of proteasomal processing, transport into the endoplasmic reticulum, affinity for the relevant MHC class I alleles and gene expression or protein translation levels.
== Clinical significance == An inability to break down the proteoglycans is characteristic of a group of genetic disorders, called mucopolysaccharidoses. The inactivity of specific lysosomal enzymes that normally degrade glycosaminoglycans leads to the accumulation of proteoglycans within cells. This leads to a variety of disease symptoms, depending upon the type of proteoglycan that is not degraded. Mutations in the gene encoding the galactosyltransferase B4GALT7 result in a reduced substitution of the proteoglycans decorin and biglycan with glycosaminoglycan chains, and cause a spondylodysplastic form of Ehlers–Danlos syndrome.
=== Urinary preparations === Purified urinary FSH (75 IU FSH and ≤ 2 IU of LH) Generic urofollitropin for injection, purified. Brands Bravelle, U.S., (≤ 2 IU LH) Metrodin, U.S. and Canada, (≤ 1 IU LH) Fertinorm Hp, (Canada) Highly purified urinary FSH (75 IU FSH and ≤ 0.1 IU LH/1000 IU FSH) Generic urofollitropin for injection, (highly) purified. Brands Fertinex (≤ 0.1 IU LH/1000 IU FSH)
Sources: en.wikipedia.org
Semax is based on the ACTH(4-10) fragment, a seven-amino-acid segment of adrenocorticotropic hormone. The synthetic peptide retains the core sequence while removing regions associated with endocrine activity. This modification is intended to isolate effects on the nervous system.
It is registered for clinical use in Russia and a few other countries, typically as a nasal drop formulation. It does not hold approval from the United States Food and Drug Administration or the European Medicines Agency. Outside those markets it is generally handled as a research chemical.
The compound was developed in Moscow and the earliest studies were conducted there, so the primary literature is largely in Russian-language journals. Translation and indexing have been incomplete, which limits access for outside researchers. Independent groups have since published some work, but the total volume remains modest.
电喷雾或基质辅助激光解吸电离质谱是常用手段，测得的质子化离子质荷比可换算为分子量。结果与理论值落在合理误差内，才支持结构一致的判断。