Everything below concerns reversed-phase HPLC. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-06-20. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
Identity and purity are confirmed with reversed-phase high-performance liquid chromatography, typically monitored at 214 nanometres where the peptide bond absorbs. Mass spectrometry, either electrospray or MALDI-TOF, verifies molecular mass against the theoretical value and detects truncation or adduct formation. Amino acid analysis and peptide mapping provide additional confirmation when required. The most frequently reported impurities are deletion sequences from incomplete coupling, methionine sulfoxide from oxidation, and dimeric species formed through non-covalent aggregation. Impurity profiles depend strongly on the synthesis and purification route chosen by the producer.
| 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 |
Development is attributed to researchers at the Institute of Molecular Genetics in Moscow during the early 1980s, building on earlier Soviet work with ACTH fragments. Russian regulatory approval followed for intranasal use, and the compound has remained commercially available there for decades. Most published human data originate from Russian and, later, some Eastern European clinical reports, which are not always accessible in English translation. Outside that region the material is generally handled as a research chemical rather than a licensed medicine.
Regulatory status differs sharply between jurisdictions. In Russia the peptide is registered as a prescription nasal preparation, while agencies such as the United States Food and Drug Administration have not approved it for any indication. Products sold elsewhere are typically labeled for laboratory research only, and such labels shift responsibility for safe handling to the purchaser. Because the same name covers pharmaceutical-grade nasal drops and bulk research powder, identity and purity documentation becomes the main practical concern when comparing sources.
Semax is a synthetic seven-amino-acid peptide whose sequence extends the ACTH(4-10) fragment with a C-terminal proline-glycine-proline tripeptide. The commonly cited sequence is Met-Glu-His-Phe-Pro-Gly-Pro, giving a molecular formula near C37H51N9O10S and a molecular weight close to 813.9 g/mol. It belongs to the broader class of synthetic ACTH fragments studied for central nervous system effects rather than for adrenal steroid stimulation. In practice the material appears as a lyophilized white powder for laboratory work or as a dilute saline solution in clinical settings.
Quality documentation for research-grade peptide usually includes a certificate of analysis stating purity, identity, and residual counterion content. Batch-to-batch variation in purity and salt form is a recognized issue, and comparisons across suppliers require attention to the exact counterion, for example acetate versus trifluoroacetate. Sequence verification by tandem mass spectrometry provides stronger evidence than a single mass measurement. For any study reporting biological results, the analytical method and the measured purity should be stated explicitly. Independent verification of supplier claims is considered good practice.
Semax is supplied as a lyophilized powder that appears white to off-white. It dissolves readily in water, phosphate-buffered saline, and other aqueous media, which simplifies preparation of working solutions for laboratory use. The nasal products registered in Russia are dilute aqueous solutions, typically around 0.1 percent peptide by weight. Organic solvents are rarely necessary and can complicate handling. Because the peptide is hygroscopic, weighing should be performed quickly and with minimal exposure to ambient humidity.
Reported pharmacological work centers on neurotrophic signaling, including changes in BDNF and NGF expression in hippocampal tissue in animal models. Human data come largely from studies conducted in Russia, and how well those results generalize to other populations remains an open question. Regulatory status differs sharply by jurisdiction: Semax is a registered prescription medicine in Russia, while it holds no approved marketing status in the United States or the European Union. Outside such jurisdictions it is generally handled as a research chemical, which affects both documentation and quality expectations.
Semax is a synthetic heptapeptide whose sequence is Met-Glu-His-Phe-Pro-Gly-Pro. It was developed as a fragment analog of adrenocorticotropic hormone, modeled specifically on the ACTH(4-10) region. The first four residues reproduce that fragment, while a Pro-Gly-Pro tripeptide is appended at the C-terminus. Work on the compound originated in Russia, where it entered clinical use as an intranasal preparation. Its sequence places it among short regulatory peptides studied for effects on the central nervous system rather than on the adrenal axis.
==== Section E: Air Conditioning, Heat Pumps, and Energy Recovery ==== IIR's Section E coordinates the work of both "Commission E1: Air-Conditioning" and "Commission E2: Heat Pumps and Heat Recovery". The core activities and interests of both Commissions are strongly connected, resulting in tight collaboration and jointly organised conferences. Air-conditioning is a subject that is now more frequently addressed due to both better comfort in an increasing number of countries and the effects of global warming. Now, even countries where demand for air-conditioning during summer months was limited, due to a cooler climate, require the operation of an air-conditioning plant for longer periods. The demand for heating is nevertheless significant, and the most efficient system to provide heating is undoubtedly the heat pump. No other technology can provide net primary energy savings, economic benefits to users and reduced climate impact at the same time. As it is also able to provide a cooling effect, it is theorised that heat pumps are expected to become a more common solution for year-round needs. When combined with heat recovery-capable buildings or industrial plants, it is expected that cooling and heating requirements can be met in an efficient, reliable, cost-effective, and environmentally friendly manner.
== Early life and education == King was born in 1934 in an army family. Since childhood, King enjoyed hiking and camping. He graduated from Episcopal High School in Alexandria, Virginia. He received a B.E. in chemical engineering from Yale University in 1956. He then entered Massachusetts Institute of Technology, where he received S.M. in chemical engineering in 1958 and Sc.D. in chemical engineering in 1960, under the supervision of J. Edward Vivian.
President Paul Kruger called a closed council, including Jan Gerrit Bantjes, to discuss the growing problem and it was decided to put a heavy tax on the sale of dynamite to non-Boer residents. Jan G. Bantjes, fluent in both spoken and written Dutch and English, was a close confidant of Paul Kruger with their link dating to the Great Trek days. Jan's father, Jan Gerritze Bantjes, had given Paul Kruger his elementary education during the trek and Jan Gerritse was part of his inner core of associates. This closed council would be the committee which set the Transvaal Republic on a collision course with Great Britain and the Anglo-Boer War 1899-1902 and which set German feelings toward Britain at boiling point by siding with the Boers. Because of this applied dynamite tax, considerable discontent and tensions began to rise. As Johannesburg was largely an Uitlander city, non-boer leaders there began to discuss the proposals for an insurrection. Cecil Rhodes, Prime Minister of the Cape Colony, had a desire to incorporate the Transvaal and the Orange Free State in a federation under British control. Having combined his commercial mining interests with Alfred Beit to form the De Beers Mining Corporation, the two men also wanted to control the Johannesburg gold mining industry. They played a major role in fomenting Uitlander grievances. Rhodes later told the journalist W.T. Stead that he feared that a Uitlander rebellion would cause trouble for Britain if not controlled by him:
polymer A macromolecule composed of multiple repeating subunits or monomers; a chain or aggregation of many individual molecules of the same compound or class of compound. The formation of polymers is known as polymerization and generally only occurs when nucleation sites are present and the concentration of monomers is sufficiently high. Many of the major classes of biomolecules are polymers, including nucleic acids and polypeptides.
== Etymology == The word magnetohydrodynamics is derived from magneto-, meaning magnetic field; hydro-, meaning water; and dynamics, meaning movement. The field of MHD was initiated by Hannes Alfvén, who received the Nobel Prize in Physics in 1970 for his work in the field.
Sources: en.wikipedia.org
=== 24 May === Ukrainian authorities ordered the mandatory evacuation of 123 children from 36 settlements in Kharkiv Oblast due to Russian attacks. The United States sent another military aid package for Ukraine, valued at $275 million. It included HIMARS, munitions, 155 mm and 105 mm high-demand artillery rounds, Javelin and AT4 antitank systems, antitank mines, tactical vehicles, small arms and ammunition. The Ukrainian Air Force announced that it had begun using air dropped Small Diameter Bombs, which had "proved resilient to jamming" and had a "nearly 90 percent" accuracy rate, since November 2023.
== In popular culture == The company's direct analysis in real time (DART) mass spectrometry system has appeared on the television program CSI: NY. The JEOL transmission electron microscope JEM 1011 was a base platform for Prometheus (2012 film) science lab microscope.
==== 2004 DOE panel ==== In August 2003, the U.S. Secretary of Energy, Spencer Abraham, ordered the DOE to organize a second review of the field. This was thanks to an April 2003 letter sent by MIT's Peter L. Hagelstein, and the publication of many new papers, including the Italian ENEA and other researchers in the 2003 International Cold Fusion Conference, and a two-volume book by U.S. SPAWAR in 2002. Cold fusion researchers were asked to present a review document of all the evidence since the 1989 review. The report was released in 2004. The reviewers were "split approximately evenly" on whether the experiments had produced energy in the form of heat, but "most reviewers, even those who accepted the evidence for excess power production, 'stated that the effects are not repeatable, the magnitude of the effect has not increased in over a decade of work, and that many of the reported experiments were not well documented'". In summary, reviewers found that cold fusion evidence was still not convincing 15 years later, and they did not recommend a federal research program. They only recommended that agencies consider funding individual well-thought studies in specific areas where research "could be helpful in resolving some of the controversies in the field". They summarized its conclusions thus:
=== Composite === As described above the properties of the nanocellulose makes an interesting material for reinforcing plastics. Nanocellulose can be spun into filaments that are stronger and stiffer than spider silk. Nanocellulose has been reported to improve the mechanical properties of thermosetting resins, starch-based matrixes, soy protein, rubber latex, poly(lactide). Hybrid cellulose nanofibrils-clay minerals composites present interesting mechanical, gas barrier and fire retardancy properties. The composite applications may be for use as coatings and films, paints, foams, packaging.
Sources: en.wikipedia.org
These coping mechanisms that aim to preserve the sacred have been found by researchers to increase well-being and return the individual back to the sacred. Overall, spirituality is a process that occurs over a lifetime and includes searching, conserving, and redefining what is sacred in an extremely individualized manner. It does not always have a positive effect and in fact, has been associated with very negative events and life changes. Research is lacking in spirituality but it is necessary because spirituality can assist in enhancing the experiences of the uncontrollable parts of life.
Vitexin is an apigenin flavone glucoside, a chemical compound found in the passion flower, Vitex agnus-castus (chaste tree or chasteberry), in the Phyllostachys nigra bamboo leaves, in the pearl millet (Pennisetum millet), and in hawthorn.
AOA1 is caused by biallelic mutation in APTX gene. Missense mutations (mutations that result in the change of amino acids in the specific location of the protein) usually result in much milder symptoms and delayed onset than truncating mutations. Founder effect was found in Japanese and Portuguese patients (V230fs and P206L are Japanese founder mutations; R199H and W279X are Portuguese founder mutations). Monoallelic variants, in rare cases, can produce phenotype similar to multiple system atrophy.
The argument that Belgians would believe it was butter if it was not cube shaped was disproportionate: it would "considerably exceed the requirements of the object in view" and labelling would protect consumers "just as effectively". In a 2003 case, Commission v Italy Italian law required that cocoa products that included other vegetable fats could not be labelled as "chocolate". It had to be "chocolate substitute". All Italian chocolate was made from cocoa butter alone, but British, Danish and Irish manufacturers used other vegetable fats. They claimed the law infringed article 34. The Court of Justice held that a low content of vegetable fat did not justify a "chocolate substitute" label. This was derogatory in the consumers' eyes. A 'neutral and objective statement' was enough to protect consumers. If member states place considerable obstacles on the use of a product, this can also infringe article 34. So, in a 2009 case, Commission v Italy, the Court of Justice held that an Italian law prohibiting motorcycles or mopeds pulling trailers infringed article 34. Again, the law applied neutrally to everyone, but disproportionately affected importers, because Italian companies did not make trailers. This was not a product requirement, but the Court reasoned that the prohibition would deter people from buying it: it would have "a considerable influence on the behaviour of consumers" that "affects the access of that product to the market". It would require justification under article 36, or as a mandatory requirement.
=== Skin === One form the rashes take is called "heliotrope" (a purplish color) or lilac, but may also be red. It can occur around the eyes along with swelling, but also occurs on the upper chest or back what is called the "shawl" (around the neck) or "V-sign" above the breasts and may also occur on the face, upper arms, thighs, or hands. Another form the rash takes is called Gottron's sign, which is red or violet, sometimes scaly, slightly raised papules that erupt on any of the finger joints (the metacarpophalangeal joints or the interphalangeal joints). Gottron's papules may also be found over other bony prominences including the elbows, knees, or feet. All these rashes are made worse by exposure to sunlight, and are often very itchy, painful, and may bleed. If a person exhibits only skin findings characteristic of DM, without weakness or abnormal muscle enzymes, may be classified as having amyopathic or clinically amyopathic dermatomyositis (ADM), formerly known as "dermatomyositis sine myositis".
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.
Reversed-phase HPLC gives the main purity figure, most often with UV detection near 214 nanometres. Mass spectrometry then confirms the molecular mass. Together the two methods distinguish a correct sequence from a closely related impurity.