If you have been reading about heptapeptide and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2026-08-01. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
| 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 |
Pharmacological accounts link semax to melanocortin signalling and to modulation of neurotrophic factor expression, particularly brain-derived neurotrophic factor and nerve growth factor. Much of this evidence comes from rodent studies using intranasal delivery, a route chosen because it allows peptides to reach the central nervous system with limited systemic exposure. Whether the same mechanisms operate in humans at comparable magnitude remains an open question. The precise receptor or receptors responsible for the reported behavioural and neuroprotective effects have not been conclusively identified.
Clinical reports describe use in ischaemic stroke, transient ischaemic attack, optic nerve conditions, and cognitive complaints, but most of these studies are small and were conducted in a single region. Systematic reviews have generally described the evidence base as limited in size and variable in methodological quality. Randomised controlled data suitable for international regulatory assessment are scarce. As a result, major treatment guidelines outside Russia do not include the peptide, and interest in it remains largely research-driven rather than routine clinical.
== Yeast nutrients == Yeast requires water, carbon sources such as starch and simple carbohydrates, nitrogen (preferably as ammonium as it cannot assimilate nitrate), sulfur, phosphorus (often as inorganic phosphate), and minute quantities of vitamins and elemental mineral ions. Ammonium chloride, ammonium sulfate, or ammonium phosphate may be used as sources of nitrogen. Phosphoric acid, an acidulant normally used in cola, is used as a yeast stimulant. Calcium iodate, an oxidant, is a U.S. Food and Drug Administration generally recognized as safe source of calcium and iodide.
== Modification and reform == Despite an increasing number of countries deviating from the conventions, particularly in the area of cannabis legalization, the prospect of fundamental amendment of the treaties seems distant at best, as the parties are roughly split between those who favor reform and those who adamantly back the existing prohibitionist regime. Provisions for treaty revision in the conventions allow changes to be easily blocked by states supporting a more prohibitive approach. The 1972 Protocol amending the Single Convention marked the only successful attempt to modify the drug conventions to date. Apart from formal amendment, there other the options. Countries can of withdraw entirely, or withdraw and re-accede with a reservation, as in the case of Bolivia's coca leaf exception. Another option is inter se treaty modification, provided for in the VCLT, where two or more countries create a sub-treaty framework and modify certain convention provisions, such as for cannabis, to their needs; additional countries could accede at later dates. A 2023 policy paper on treaty-compliant approaches to cannabis regulation within the EU explored 11 potential options under a variety of scenarios.
===== Extraterrestrial origin of homochirality ===== Some analyses of organic molecules in extraterrestrial materials, such as carbonaceous chondrite meteorites and asteroids, identified small enantiomeric enrichments in a few L-amino acids and D-sugars, leading to the proposition that initial enantiomeric bias could have been seeded on Earth from space. That the enantiomeric biases measured in meteorites and astroids were consistent with that found in biology added credence to this idea, and experimental work showed plausible mechanisms for creating this enantiomeric bias in extraterrestrial materials. It was hypothesized that circularly polarized light originating from Mie scattering on aligned interstellar dust particles may trigger the formation of an enantiomeric excess within chiral material in space. Interstellar and near-stellar magnetic fields can align dust particles in this fashion. Another speculation (the Vester-Ulbricht hypothesis) suggests that fundamental chirality of physical processes such as that of the beta decay (see Parity violation) leads to slightly different half-lives of biologically relevant molecules. The amino acids in asteroids Bennu and Ryugu show no chiral bias. The Murchinson meteorite contained only racemic amino acids.
==== Cognitive symptoms ==== Suicidal ideation Susceptibility to cravings Depression Spontaneous orgasm Prolonged insomnia Delirium Auditory hallucinations Visual hallucinations Increased perception of odors (olfaction), real or imagined Marked decrease in sex drive Agitation Anxiety Panic disorder Nervousness Paranoia Delusions Apathy Anorexia (symptom)
Several of the food issues from the Mercury missions were addressed for the later Gemini missions (1965–1966). Tubes (often heavier than the foods they contained) were abandoned, gelatin coatings were added to the bite-sized cubes to help prevent them from crumbling, and simpler rehydration methods were developed. The menus were also expanded to include items such as shrimp cocktail, chicken and vegetables, toast squares, butterscotch pudding, and apple juice. The crew of Gemini 3 snuck a corned beef sandwich on their spaceflight. Mission Commander Gus Grissom loved corned beef sandwiches, so Pilot John Young brought one along, having been encouraged by fellow astronaut Walter Schirra. However, Young was supposed to eat only approved food, and Grissom was not supposed to eat anything at all. Floating crumbs from the bread posed a potential problem, causing Grissom to put the sandwich away and the astronauts were mildly rebuked by NASA for the act. A congressional hearing was called, forcing NASA deputy administrator George Mueller to promise no repeats, and NASA employed renewed vigilance regarding what astronauts brought along on future missions.
Sources: en.wikipedia.org
==== Mineral extraction and hardware footprint ==== The physical infrastructure of AI, specifically the Graphics Processing Units (GPUs) and data centres required to train and run large language models, relies heavily on critical minerals and rare earth elements. A 2026 study published in Nature Communications Earth & Environment quantified the material footprint of AI training, revealing that AI hardware consists of approximately 90% heavy metals. The study estimated that training a single large language model requires the equivalent lifetime consumption of between 1,760 and 8,800 GPUs, underscoring that incremental model performance gains come at disproportionately high material costs. The extraction of these minerals, such as cobalt, lithium, tantalum, and coltan, is heavily concentrated in the Global South and is frequently associated with severe environmental degradation and human rights abuses. For example, the Democratic Republic of Congo (DRC) holds roughly 70% of the world's cobalt reserves, alongside vast deposits of coltan and copper. Academic analyses note that the global AI supply chain relies on a familiar geopolitical division of labour: African countries mine the raw materials, while Western and East Asian economies refine them and capture the technological value. In the UK, a coalition of NGOs including Friends of the Earth, the Trade Justice Movement, and the London Mining Network published a joint report in May 2026 criticising the UK Government's critical minerals agenda.
Intelligence & achievement tests – These tests are designed to measure certain specific kinds of cognitive functioning (often referred to as IQ) in comparison to a norming group. These tests, such as the WISC-IV and the WAIS, attempt to measure such traits as general knowledge, verbal skill, memory, attention span, logical reasoning, and visual/spatial perception. Several tests have been shown to predict accurately certain kinds of performance, especially scholastic. Other tests in this category include the WRAML and the WIAT. Personality tests – Tests of personality aim to describe patterns of behavior, thoughts, and feelings. They generally fall within two categories: objective and projective. Objective measures, such as the MMPI, are based on restricted answers—such as yes/no, true/false, or a rating scale—which allow for the computation of scores that can be compared to a normative group. Projective tests, such as the Rorschach inkblot test, allow for open-ended answers, often based on ambiguous stimuli. Other commonly used personality assessment measures include the PAI and the NEO Neuropsychological tests – Neuropsychological tests consist of specifically designed tasks used to measure psychological functions known to be linked to a particular brain structure or pathway. They are typically used to assess impairment after an injury or illness known to affect neurocognitive functioning, or when used in research, to contrast neuropsychological abilities across experimental groups.
Amoxapine possesses a wide array of pharmacological effects. It is a moderate and strong reuptake inhibitor of serotonin and norepinephrine, respectively, and binds to the 5-HT2A, 5-HT2B, 5-HT2C, 5-HT3, 5-HT6, 5-HT7, D2, α1-adrenergic, D3, D4, and H1 receptors with varying but significant affinity, where it acts as an antagonist (or inverse agonist depending on the receptor in question) at all sites. It has weak but negligible affinity for the dopamine transporter and the 5-HT1A, 5-HT1B, D1, α2-adrenergic, H4, mACh, and GABAA receptors, and no affinity for the β-adrenergic receptors or the allosteric benzodiazepine site on the GABAA receptor. Amoxapine is also a weak GlyT2 blocker, as well as a weak (Ki = 2.5 μM, EC50 = 0.98 μM) δ-opioid receptor partial agonist. 7-Hydroxyamoxapine, a major active metabolite of amoxapine, is a more potent dopamine receptor antagonist and contributes to its neuroleptic efficacy, whereas 8-Hydroxyamoxapine is a norepinephrine reuptake inhibitor but a stronger serotonin reuptake inhibitor and helps to balance amoxapine's ratio of serotonin to norepinephrine transporter blockade.
These data suggest the possibility that lower doses of lithium orotate than lithium carbonate may achieve therapeutic brain lithium concentrations and relatively stable serum concentrations. A year later, Smith and Schou repeated the experiment at a higher dose (2 mM Li+) and found that the higher concentrations in the brain could be possibly accounted for by decreased renal function in rats treated with lithium orotate. The proponents of lithium orotate have since criticized the results by citing the fact that the dose of lithium orotate used in the study was in the toxic range. In 2022, Pacholko redid the experiment and showed lithium orotate to have a safer kidney profile than lithium carbonate, it also showed that both had an increased TSH only in females, but the increase was lower in the orotate group. The pharmacokinetics of lithium orotate in human brains is poorly documented, and there is no known mechanism by which orotate ions could alter the pharmacokinetics of dissociated lithium ions, however, lithium intake appears to be effective even at low doses, and this may account for lithium orotate's claimed effectiveness. The reason why lithium orotate is poorly studied as a medication compared to lithium carbonate is concerns raised in 1979 regarding the potential amplified renal toxicity of lithium orotate in comparison to lithium carbonate. These concerns were likely based on the results of the use of excessively high concentrations of lithium orotate in the studies.
Sources: en.wikipedia.org
The silver nanoparticles were found in the organic matrix of the bacteria. Lactic acid producing bacteria have been used to produce silver nanoparticles. The bacteria Lactobacillus spp., Pediococcus pentosaceus, Enteroccus faeciumI, and Lactococcus garvieae have been found to be able to reduce silver ions into silver nanoparticles. The production of the nanoparticles takes place in the cell from the interactions between the silver ions and the organic compounds of the cell. It was found that the bacterium Lactobacillus fermentum created the smallest silver nanoparticles with an average size of 11.2 nm. It was also found that this bacterium produced the nanoparticles with the smallest size distribution and the nanoparticles were found mostly on the outside of the cells. It was also found that there was an increase in the pH increased the rate of which the nanoparticles were produced and the amount of particles produced.
About 95 minutes after launch, the satellite flew over its launch site, and its radio signals were picked up by the engineers and military personnel at Tyura-Tam: that's when Korolev and his team celebrated the first successful artificial satellite placed into Earth-orbit. The next satellite sent by the Soviets after Sputnik 1 was Sputnik 2, launched on November 3, 1957, just a month later. This would put the first animal into orbit.
Lung fibrosis is a recognized complication of rheumatoid arthritis. It is also a rare but well-recognized consequence of medications used to treat RA such as methotrexate and leflunomide). Caplan's syndrome describes lung nodules in individuals with RA and additional exposure to coal dust. Exudative pleural effusions are also associated with RA.
It acts by interfering with the signal transmission between vestibular apparatus of the inner ear and the vomiting centre of the hypothalamus by limiting the activity of the vestibular hair cells which send signals about movement. The disparity of signal processing between inner ear motion receptors and the visual senses is abolished, so that the confusion of brain whether the individual is moving or standing is reduced. Vomiting in motion sickness could be a physiological compensatory mechanism of the brain to keep the individual from moving so that it can adjust to the signal perception, but the true evolutionary reason for this malady is currently unknown. When prescribed for balance problems and vertigo, cinnarizine is typically taken two or three times daily depending on the amount of each dose and when used to treat motion sickness, the pill is taken at least two hours before travelling and then again every four hours during travel. However, a recent 2012 study comparing the effects of cinnarizine to transdermal scopolamine for the treatment of seasickness, concluded that scopolamine was reported as significantly more effective and as having fewer adverse side effects than cinnarizine. This led to the conclusion that transdermal scopolamine is likely a better option for the treatment of motion sickness in naval crew and other sea travelers. However, due to increased levels of drowsiness caused by the medication, it is generally of limited use in pilots and aircrew who must be dependably alert.
Some diseases result from a poorly functioning basement membrane. The cause can be genetic defects, injuries by the body's own immune system, or other mechanisms. Diseases involving basement membranes at multiple locations include:
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.
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.