Everything below concerns RP-HPLC. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-08-11. Where a claim depends on a specific study, the study is described rather than over-claimed.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It corresponds to the ACTH(4-7) fragment extended at the C-terminus by a Pro-Gly-Pro tripeptide, an addition intended to slow enzymatic breakdown. The molecular formula is C37H51N9O10S and the molecular mass is approximately 814 daltons. In the literature it is often described as an ACTH(4-10) analog, although that label reflects a naming convention as much as a precise structural relationship. The compound was developed in Russia and remains most closely associated with that research tradition.
Laboratory descriptions of the material are consistent across suppliers. It appears as a white to off-white lyophilized powder that dissolves readily in water and in polar organic solvents such as dimethyl sulfoxide. Aqueous solutions are clear and colorless at low concentrations. Because the peptide contains methionine, oxidation at the sulfur atom is a recognized degradation pathway, and handling notes usually call for protected, desiccated storage. Reported purity for research-grade lots is generally above 95 percent as measured by reversed-phase high-performance liquid chromatography.
The compound is registered in Russia as a pharmaceutical product, most commonly formulated as a nasal solution, and has been used in that setting since the 1990s. Outside that jurisdiction it is generally handled as a research chemical rather than an approved medicine. Regulatory status therefore differs sharply between countries, and material sold internationally may not correspond to the Russian pharmaceutical formulation. Documentation with commercial samples is typically limited to a certificate of analysis covering purity and identity, not clinical status or local legal classification.
Once dissolved, the peptide is considerably less stable than the solid. Aqueous solutions are usually prepared at neutral to slightly acidic pH, filtered, and divided into single-use aliquots before freezing. Repeated freeze-thaw cycles are a common cause of avoidable loss and are best prevented by never refreezing a thawed aliquot. Adsorption to plastic and glass surfaces can lower the measured concentration of dilute solutions, particularly below roughly 0.1 mg/mL. Buffer choice, salt content, and container material all influence how much peptide remains detectable after storage.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C37H51N9O10S | Contains one methionine sulfur atom |
| Molecular mass | Approximately 814 Da | Consistent with a seven-residue peptide |
| Appearance | White to off-white powder | Typical lyophilized form |
| Solubility | Freely soluble in water | Also soluble in dimethyl sulfoxide |
| Typical storage | -20 °C, desiccated | Limits methionine oxidation |
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.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It was derived from the ACTH(4-10) fragment, a short segment of adrenocorticotropic hormone that lacks the hormonal activity associated with the full-length peptide. Researchers at the Institute of Molecular Genetics in Moscow developed the compound during the 1980s. It has been registered as a pharmaceutical product in Russia and several neighbouring countries, where it is supplied as a nasal solution, and it is also sold internationally as a research chemical.
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.
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.
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.
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。
Semax 是一种人工合成的七肽，氨基酸序列为 Met-Glu-His-Phe-Pro-Gly-Pro，单字母缩写记作 MEHFPGP。它被归类为促肾上腺皮质激素片段 ACTH(4-10) 的结构类似物，但并不天然存在于生物体内。母体片段 ACTH(4-10) 的序列为 Met-Glu-His-Phe-Arg-Trp-Gly，Semax 替换了中间两个残基，并在羧基端延长了 Pro-Gly-Pro 三肽。这种延长被普遍认为能提升分子对肽酶的耐受性。
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。
Spondyloperipheral dysplasia is an autosomal dominant disorder of bone growth. The condition is characterized by flattened bones of the spine (platyspondyly) and unusually short fingers and toes (brachydactyly). Some affected individuals also have other skeletal abnormalities, short stature, nearsightedness (myopia), hearing loss, and mental retardation. Spondyloperipheral dysplasia is a subtype of collagenopathy, types II and XI.
As a particle moves toward the pole opposite of its charge it moves through the changing pH gradient until it reaches a point in which the pH of that molecule's isoelectric point is reached. At this point the molecule no longer has a net electric charge (due to the protonation or deprotonation of the associated functional groups) and as such will not proceed any further within the gel. The gradient is established before adding the particles of interest by first subjecting a solution of small molecules such as polyampholytes with varying pI values to electrophoresis. The method is applied particularly often in the study of proteins, which separate based on their relative content of acidic and basic residues, whose value is represented by the pI. Proteins are introduced into an immobilized pH gradient gel composed of polyacrylamide, starch, or agarose where a pH gradient has been established. Gels with large pores are usually used in this process to eliminate any "sieving" effects, or artifacts in the pI caused by differing migration rates for proteins of differing sizes. Isoelectric focusing can resolve proteins that differ in pI value by as little as 0.01. Isoelectric focusing is the first step in two-dimensional gel electrophoresis, in which proteins are first separated by their pI value and then further separated by molecular weight through SDS-PAGE. Isoelectric focusing, on the other hand, is the only step in preparative native PAGE at constant pH.
In the above formula, the superscripts "ionized" each indicate the sum of concentrations of all ionized species in their respective phases. In addition, since log D is pH-dependent, the pH at which the log D was measured must be specified. In areas such as drug discovery—areas involving partition phenomena in biological systems such as the human body—the log D at the physiologic pH = 7.4 is of particular interest. It is often convenient to express the log D in terms of PI, defined above (which includes P0 as state I = 0), thus covering both un-ionized and ionized species. For example, in octanol–water:
where {ML} is the activity of the chemical species ML etc. K⊖ is dimensionless since activity is dimensionless. Activities of the products are placed in the numerator; activities of the reactants are placed in the denominator. See activity coefficient for a derivation of this expression. Since activity is the product of concentration and activity coefficient (γ) the definition could also be written as
Sources: en.wikipedia.org
Jaundice Abnormal liver function test results Tardive dyskinesia – an often incurable movement disorder that usually results from years of continuous treatment with antipsychotic drugs, especially typical antipsychotics like flupenthixol. It presents with repetitive, involuntary, purposeless and slow movements; TD can be triggered by a fast dose reduction in any antipsychotic. Hypotension Confusional state Seizures Mania Hypomania Depression Hot flush Anergia Appetite changes Weight changes Hyperglycemia – high blood glucose (sugar) levels Abnormal glucose tolerance Pruritus – itchiness Rash Dermatitis Photosensitivity – sensitivity to light Oculogyric crisis Accommodation disorder Sleep disorder Impaired concentration Tachycardia QTc interval prolongation – an abnormality in the electrical activity of the heart that can lead to potentially fatal changes in heart rhythm (only in overdose or <10 ms increases in QTc) Torsades de pointes Miosis – constriction of the pupil of the eye Paralytic ileus – paralysis of the bowel muscles leading to severe constipation, inability to pass wind, etc. Mydriasis Glaucoma
=== Extrapulmonary localized in the lymph nodes === This is an extremely rare type of small cell, and there has been little information in the scientific community. It appears to occur in only one or more lymph nodes, and nowhere else in the body. Treatment is similar to small-cell lung cancer, but survival rates are much higher than other small-cell carcinomas.
Representative Don Bacon became the first Republican House member to urge that Hegseth be fired. At least five political appointees within the Department of Defense resigned by April 24. That day, Joe Kesper, Hegseth's chief of staff, resigned, but stated that he would remain at the department as a special government employee. The firings and resignations led to a crisis within the Department of Defense that was described as a "free-for-all" by one employee who spoke to Politico.
The white shark has a stocky, torpedo-shaped body with a short, cone-shaped snout. Its long gill slits do not reach around the head. It has a large triangular first dorsal fin, which partly lines up with the pectoral fins, and a tiny second dorsal fin. The tail fin has two lobes of similar size and a single ridge or keel, and the anal fin is tiny. The white shark has a countershaded coloration for camouflage; being dark on top, usually blue-gray or gray-brown, with a white underside. It also has black tips on the underside of the pectoral fins. There is evidence that the species can change pigments, adding dark pigment or melanin to blotches of white over the course of months. The skin is covered in dermal denticles (tooth-like scales), which are proportionally smaller than in other sharks and have a three-to-five-ridged surface, with each ridge having tips that point backwards.
== Dietary sources == NMN is found in fruits and vegetables such as edamame, broccoli, cabbage, cucumber and avocado at a concentration of about 1 mg per 100g, making these natural sources impractical to acquire the quantities needed to accomplish the dosing.
Sources: en.wikipedia.org
The Macrobian ruler, who was elected based on his stature and beauty, replied instead with a challenge for his Persian counterpart in the form of an unstrung bow: if the Persians could manage to draw it, they would have the right to invade his country; but until then, they should thank the gods that the Macrobians never decided to invade their empire. The Macrobians were a regional power reputed for their advanced architecture and gold wealth, which was so plentiful that they shackled their prisoners in golden chains. During the classical period, the Barbara city-states of Mosylon, Opone, Mundus, Isis, Malao, Avalites, Essina, Nikon and Sarapion developed a lucrative trade network, connecting with merchants from Ptolemaic Egypt, Ancient Greece, Phoenicia, Parthian Persia, Saba, the Nabataean Kingdom, and the Roman Empire. They used the ancient Somali maritime vessel known as the beden to transport their cargo.
States choose to balance for two reasons. First, they place their survival at risk if they fail to curb a potential hegemon before it becomes too strong; to ally with the dominant power means placing one's trust in its continued benevolence. Secondly, joining the weaker side increases the likelihood that the new member will be influential within the alliance. States choose to bandwagon because it may be a form of appeasement as the bandwagoner may hope to avoid an attack by diverting it elsewhere—a defensive reason—or because it may align with the dominant side in wartime to share the spoils of victory—an offensive reason. Realists claim that balancing is when states ally against the prevailing threat and results in a more secure world whereas in a bandwagoning world security is scarce as rising hegemons are not kept in check. With bandwagoning, the threatened state abandons hope of preventing the aggressor from gaining power at its expense and instead joins forces with its dangerous foe to get at least some small portion of the spoils of war. The weaker the state the more likely it is to bandwagon than to balance as they do little to affect the outcome and thus must choose the winning side. Strong states may change a losing side into a winning side and thus are more likely to balance. States will be tempted to bandwagon when allies are unavailable, however excessive confidence in allied support encourages weak states to free ride relying on the efforts of others to provide security.
=== Off-label drugs === α2-Adrenergic receptor agonists (e.g., clonidine, guanfacine) Anticonvulsants/mood stabilizers (e.g., valproic acid, lamotrigine) Antipsychotics (non-licensed) (e.g., haloperidol, olanzapine) Cannabinoids (e.g., cannabis, dronabinol, nabilone) Dietary supplements (e.g., N-acetylcysteine, omega-3 fatty acids, sulforaphane) Entactogens (serotonin releasing agents) (e.g., MDMA) Melatonin receptor agonists (e.g., melatonin) NMDA receptor antagonists (e.g., memantine, amantadine) Norepinephrine reuptake inhibitors (NRIs) (e.g., atomoxetine) Opioid receptor antagonists (e.g., naltrexone) Other antidepressants (e.g., mirtazapine) Oxytocin receptor agonists (e.g., oxytocin) Probiotics and prebiotics Psychostimulants (norepinephrine–dopamine releasing agents and/or reuptake inhibitors) (e.g., amphetamine, methylphenidate) Selective serotonin reuptake inhibitors (SSRIs) (e.g., fluoxetine, fluvoxamine, sertraline, citalopram) Serotonergic psychedelics (e.g., psilocybin, lysergic acid diethylamide (LSD)) Serotonin–norepinephrine reuptake inhibitors (SNRIs) (e.g., milnacipran) Serotonin releasing agents (e.g., fenfluramine—withdrawn and no longer recommended) Serotonin 5-HT1A receptor agonists (e.g., buspirone) Tricyclic antidepressants (TCAs) (e.g., clomipramine)
=== Stimulants === Stimulants are drugs that usually act on the central nervous system to modulate mental function and behavior, increasing an individual's sense of excitement, decreasing the sensation of fatigue and improving motor coordination. The latter happens via improvement of the interaction between nervous system and musculature. It has greater effect when an athlete is already exhausted - the period when the coordination suffers the most. In the World Anti-Doping Agency list of prohibited substances, stimulants are the second largest class after the anabolic steroids. Benzedrine is a trade name for amphetamine. The Council of Europe says it first appeared in sport at the Berlin Olympics in 1936. It was produced in 1887 and the derivative, Benzedrine, was isolated in the U.S. in 1934 by Gordon Alles. Its perceived effects gave it the street name "speed". British troops used 72 million amphetamine tablets in the Second World War and the RAF got through so many that "Methedrine won the Battle of Britain" according to one report. The problem was that amphetamine leads to a lack of judgement and a willingness to take risks, which in sport could lead to better performances but in fighters and bombers led to more crash landings than the RAF could tolerate. The drug was withdrawn but large stocks remained on the black market. Amphetamine was also used legally as an aid to slimming and also as a thymoleptic before being phased out by the appearance of newer agents in the 1950s.
In Truth Social, Trump also claimed that Xi agreed on rebranding artificial intelligence to "super intelligence", saying "Like almost everyone else, he seemed to like calling the poorly and inaccurately named Artificial Intelligence to a far more accurate and important name, SUPER INTELLIGENCE" and that "That would be ‘SUPER!’ Everyone last night agreed, also." In response, the spokesperson of the Ministry of Foreign Affairs of China said that China respects the US's use of the term "super intelligence". Russian President Vladimir Putin commented on the visit, saying that Russia welcomes dialogue between the United States and China, and that whatever results the United States and China achieve will affect the entire world economy. After Xi left the US, President Trump called Japanese Prime Minister Sanae Takaichi. Trump explained to Takaichi the content of his talks with Xi Jinping during the meeting. The two exchanged views on China-related issues. Takaichi said that she and Trump maintained communication before and after Xi's visit, showing the close relationship between the US and Japan.
Sources: en.wikipedia.org
It is registered as a pharmaceutical product in Russia, where it is typically supplied as a nasal solution. In most other countries it is not an approved drug and is traded as a research chemical instead. Approval status depends entirely on the jurisdiction involved.
Most published work uses intranasal administration, matching the route of the registered Russian formulation. Some animal experiments use intravenous or intraperitoneal injection. The route matters because the intact peptide is cleared rapidly from blood, so exposure differs between methods.
A purity value describes the share of the powder accounted for by the target peptide, usually by high-performance liquid chromatography. It does not confirm that the sequence is correct, which requires mass spectrometry or amino acid analysis. Purity and identity are separate checks.
Each freeze-thaw cycle can degrade a fraction of the peptide and promote aggregation. Dividing a stock solution into single-use volumes removes repeated cycling as a variable. It also limits the time a thawed solution spends at room temperature.