Everything below concerns heptapeptide. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-08-01. Where a claim depends on a specific study, the study is described rather than over-claimed.
The C-terminal Pro-Gly-Pro extension is not incidental. Proline-rich tails are known to resist several common peptidases, and the published literature attributes the longer half-life of Semax, relative to unmodified ACTH fragments, to this feature. The modification also removes the melanocyte-stimulating and corticosteroidogenic activity that characterizes longer ACTH-derived sequences. Because the molecule is small and hydrophilic, it is typically formulated as an aqueous solution for intranasal or parenteral delivery. Acetylation or amidation at the termini appears in closely related research peptides and shifts the mass by a fixed increment.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular weight | ~813.9 Da (free heptapeptide) | N-acetylated form is about 42 Da heavier |
| Residue count | 7 (heptapeptide) | Four residues from ACTH(4-10), three added |
| Appearance | White to off-white powder | Usually supplied lyophilized |
| Solubility class | Freely soluble in water | Also dissolves in DMSO and polar organic solvents |
| Related parent fragment | ACTH(4-10) | Parent motif is Met-Glu-His-Phe |
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It is described in the literature as an analogue of the ACTH(4–10) fragment, a short N-terminal portion of adrenocorticotropic hormone that retains some neurotropic activity without the full hormonal effects of the parent peptide. The molecule carries a methionine residue at the N-terminus and two proline residues near the C-terminus, features that shape both its interactions with receptor systems and its chemical stability. The free peptide corresponds to the formula C37H51N9O10S and a molecular mass near 813.9 Da.
The compound was developed in the 1980s at the Institute of Molecular Genetics in Moscow, where it emerged from research on short ACTH fragments and their effects on the central nervous system. Russian pharmaceutical listings describe it as a nootropic and neuroprotective agent, most often formulated as nasal drops. It is not a marketed medicine in the United States or the European Union, and no pharmacopoeial monograph covers it. Consequently, most published clinical experience with the substance originates from a small number of research centres, mainly in Russia and neighbouring countries.
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.
Laboratory work points toward modulation of neurotrophic signaling, particularly expression of brain-derived neurotrophic factor and nerve growth factor in hippocampal tissue. Studies also describe effects on monoamine turnover, inflammatory mediators, and oxidative markers. These observations come mainly from animal models and cultured cells, so the causal chain in humans is not firmly established. Whether the reported molecular changes translate into measurable clinical benefit is an open question. Reviews generally present the mechanism as plausible rather than demonstrated.
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.
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.
Semax is a synthetic heptapeptide developed in the Soviet Union during the 1980s by researchers at the Institute of Molecular Genetics in Moscow. It was designed as a truncated analog of adrenocorticotropic hormone, retaining only the fragment spanning residues four through ten. Investigators sought a peptide that would preserve the cognitive effects associated with ACTH while eliminating the hormonal stimulation of the adrenal cortex. The compound entered clinical use in Russia during the following decade.
Morpholinos can interfere with pre-mRNA processing steps either by preventing splice-directing small nuclear ribonucleoproteins (snRNP) complexes from binding to their targets at the borders of introns on a strand of pre-mRNA, or by blocking the nucleophilic adenine base and preventing it from forming the splice lariat structure, or by interfering with the binding of splice regulatory proteins such as splice silencers and splice enhancers. Preventing the binding of snRNP U1 (at the donor site) or U2/U5 (at the polypyrimidine moiety and acceptor site) can cause modified splicing, commonly excluding exons from the mature mRNA. Targeting some splice targets results in intron inclusions, while activation of cryptic splice sites can lead to partial inclusions or exclusions. Targets of U11/U12 snRNPs can also be blocked. Splice modification can be conveniently assayed by reverse-transcriptase polymerase chain reaction (RT-PCR) and is seen as a band shift after gel electrophoresis of RT-PCR products.
From the defeat of the Bohemian Revolt that collapsed at the 1620 Battle of White Mountain, the Habsburgs gradually integrated the Kingdom of Bohemia into their monarchy. During the subsequent Counter-Reformation, less populated areas were resettled with Catholic Germans from the Austrian lands. From 1627, the Habsburgs enforced the so-called Verneuerte Landesordnung ("Renewed Land's Constitution"), and one of its consequences was that German, according to mother tongue, gradually became the primary and official language, while Czech declined to a secondary role in the Empire. In 1749, the Austrian Empire enforced German as the official language again. Emperor Joseph II in 1780 renounced the coronation ceremony as Bohemian king and unsuccessfully tried to push German through as sole official language in all Habsburg lands (including Hungary). Nevertheless, German cultural influence grew stronger during the Age of Enlightenment and Weimar Classicism. Contrastingly, in the course of the Romanticism movement national tensions arose, both in the form of the Austroslavism ideology developed by Czech politicians like František Palacký and Pan-Germanist activist raising the German question. Conflicts between Czech and German nationalists emerged in the 19th century, for instance in the Revolutions of 1848: while the German-speaking population of Bohemia and Moravia wanted to participate in the building of a German nation state, the Czech-speaking population insisted on keeping Bohemia out of such plans.
April 8: Decree protecting wives of political emigrants, but not husbands of female emigrants. August 31: Decree adjusting penalties for pregnant women sentenced to the pillory. September 20: Law on civil status registration and divorce, establishing near equality between spouses. Minimum marriage age set at 13 for girls and 15 for boys. 1793
In February 2023, French Foreign Minister Catherine Colonna met with President Lula and stated that "Brazil is one of the main actors on the global stage and its comeback is highly expected", highlighting that France and Brazil share a strong, centuries-old relationship. She also said that France supports a Brazilian OECD membership and that both France and the European Union are considering monetary contributions to the Amazon Fund. On 11 February, French president Emmanuel Macron expressed his approval for a peace plan on the Russia-Ukraine war proposed by Lula, which consists of creating a group of countries not involved in the conflict (either directly or indirectly, i.e. by sending weapons to one of the sides) to mediate a peace process. On 3 June 2023, Macron's office said Lula confirmed he would visit Paris in late June as part of the "Summit for a New Global Financial Pact" promoted by France to "tackle the reform of multilateral development banks (MDB), the debt crisis, financing for green technologies, the creation of new international taxes and financing instruments", among other things. On 22 June, president Lula delivered a speech during the Power Our Planet festival in Paris in which he said "actually, those who have polluted the planet over the last two centuries are the same ones who made the Industrial Revolution, and that's why they must pay their debt to the planet Earth" while calling for climate justice to Latin-American, African and Asian peoples and inviting the world to attend the COP30 climate conference in the Brazilian city of Belém.
Difluoroescaline (DFE), also known as 4-(2,2-difluoroethoxy)-3,5-dimethoxyphenethylamine, is a psychedelic drug of the phenethylamine and scaline families related to mescaline. It is a difluorinated derivative of escaline. Its dose range is 40 to 80 mg and its duration is 6 to 12 hours. The drug's effects include color enhancement, some closed-eye and open-eye visuals, emotional changes, and some physical discomfort. It acts as a low-potency partial agonist of the serotonin 5-HT2A receptor and also interacts with other serotonin receptors and targets. The chemical synthesis of difluoroescaline has been described. Difluoroescaline was first described in the scientific literature by Daniel Trachsel in 2002. Its pharmacology was studied in more detail in 2021. It is not a controlled substance in Canada as of 2025.
Sources: en.wikipedia.org
In the competition of bacterial cells and host cells with the antimicrobial peptides, antimicrobial peptides will preferentially interact with the bacterial cell to the mammalian cells, which enables them to kill microorganisms without being significantly toxic to mammalian cells. With regard to cancer cells, they themselves also secrete human antimicrobial peptides including defensin, and in some cases, they are reported to be more resistant than the surrounding normal cells. Therefore, we cannot conclude that selectivity is always high against cancer cells.
Uranium is pyrophoric when finely divided. It will corrode under the influence of air and water producing insoluble uranium(IV) and soluble uranium(VI) salts. Soluble uranium salts are toxic. Uranium slowly accumulates in several organs, such as the liver, spleen, and kidneys. The World Health Organization has established a daily "tolerated intake" of soluble uranium salts for the general public of 0.5 micrograms per kilogram (3.5×10−6 gr/lb) body weight, or 35 micrograms (0.00054 gr) for a 70 kilograms (150 lb) adult. Epidemiological studies and toxicological tests on laboratory animals point to it as being immunotoxic, teratogenic, neurotoxic, with carcinogenic and leukemogenic potential. A 2005 report by epidemiologists concluded: "the human epidemiological evidence is consistent with increased risk of birth defects in offspring of persons exposed to DU." Early studies of depleted uranium aerosol exposure assumed that uranium combustion product particles would quickly settle out of the air and thus could not affect populations more than a few kilometers from target areas, and that such particles, if inhaled, would remain undissolved in the lung for a great length of time and thus could be detected in urine. Violently burning uranium droplets produce a gaseous vapor comprising about half of the uranium in their original mass. Uranyl ion contamination in uranium oxides has been detected in the residue of DU munitions fires. Approximately 90 micrograms (0.0014 gr) of natural uranium, on average, exist in the human body as a result of normal intake of water, food and air.
A 29 June 2016, report on the ongoing cardiovascular outcomes trial for canagliflozin (CANVAS) revealed interim findings of new safety concerns including heightened risk of bone fracture that was found to increase with the duration of treatment. In May 2016, the FDA announced they were going to investigate a safety issue related to clinical trials that found an increase in leg and foot amputations, mostly affecting the toes, in people treated with the diabetes medicine canagliflozin (Invokana, Invokamet). In May 2017, the FDA concluded that canagliflozin causes an increased risk of leg and foot amputations. The FDA began requiring a boxed warning to be added to the canagliflozin drug labels to describe this risk. In August 2020, the FDA removed the requirement for the boxed warning. To lessen the risk of developing ketoacidosis (a serious condition in which the body produces high levels of blood acids called ketones) after surgery, the FDA approved changes to the prescribing information for SGLT2 inhibitor diabetes medicines to recommend they be stopped temporarily before scheduled surgery. Canagliflozin, dapagliflozin, and empagliflozin should each be stopped at least three days before, and ertugliflozin should be stopped at least four days before scheduled surgery. Symptoms of ketoacidosis include nausea, vomiting, abdominal pain, tiredness, and trouble breathing.
=== Russia === Russian authorities stated that Russia reacted to the numerous casualties among the South Ossetian civilian population caused by the Georgian attack. According to Russia, its aim was defence of Russian citizens and Russian peacekeepers in South Ossetia. According to the Russian military, the Russian peacekeepers in South Ossetia suffered casualties on August 8. Initially, Russia went as far as accusing Georgia of committing "genocide" against Ossetians. Defending Russia's decision to launch attack in uncontested Georgia, Russian Foreign Minister Sergey Lavrov said that Russian targeting of military infrastructure used for the Georgian attack was legally warranted. It was claimed that Georgia codenamed its attack Operation "Clear Field". Russia also claimed that Georgia was planning to launch a two-day Operation "Rock" to retake Abkhazia. Russia codenamed its military action "Operation to Force Georgia to Peace". The term "enforcing to peace" for describing the war against Georgia allegedly has been coined by General Anatoliy Nogovitsyn. Three years after the August War, President of Russia Dmitry Medvedev stated that NATO would have admitted Post-Soviet states if Russia had not invaded Georgia. "If you...had faltered back in 2008, the geopolitical situation would be different now," Medvedev declared at a Vladikavkaz military base. In response, the Georgian authorities claimed that Medvedev had admitted that Russia started the war with Georgia.
Sources: en.wikipedia.org
The sequence is Met-Glu-His-Phe-Pro-Gly-Pro, a seven-residue peptide. The first four residues correspond to the ACTH(4-10) fragment, and Pro-Gly-Pro is added at the C-terminus. N-acetylated versions also appear in the literature and differ in mass.
Semax is a synthetic analog of the ACTH(4-10) fragment rather than a copy of the full hormone. Truncation plus the added tail removes the steroidogenic portion of ACTH. That distinction explains why it is studied for nervous-system effects instead of adrenal stimulation.
It is registered as a prescription product in Russia and has been used there clinically, chiefly by the intranasal route. No approval exists in the United States or the European Union. Availability elsewhere typically falls under research-chemical distribution, with varying purity documentation.
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.