Semax raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2026-01-01. Anything still debated is marked as such rather than presented as settled.
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.
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.
| 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 |
Iranian vice president and reformist politician Mohammad Reza Aref, who is also an alumnus of the university, described the alleged use of a bunker-buster bomb as a "symbol of Trump's madness and ignorance".
FC SKChF Sevastopol (reconstituted based on FC Sevastopol) FC TSK Simferopol (reconstituted based on SC Tavriya Simferopol) FC Zhemchuzhina Yalta (revived based on same club that was disqualified from Ukrainian competitions) The three clubs are from Crimea, a territory recognized by Ukraine and a majority of countries as part of Ukraine, but have been under effective Russian control as the Republic of Crimea since the annexation of Crimea by the Russian Federation. FC Sevastopol and SC Tavriya Simferopol last played in the 2013–14 Ukrainian Premier League, and were dissolved after the completion of the season. The three clubs were reformed as football organizations of the Russian Federation and joined the Russian Professional Football League starting from the 2014–15 season, after approval from the Russian Football Union. The inclusion of Crimean clubs in Russian competitions have not been approved by either FIFA or UEFA, and the Football Federation of Ukraine have lodged a complaint. On 22 August 2014, UEFA decided "that any football matches played by Crimean clubs organised under the auspices of the Russian Football Union will not be recognised by UEFA until further notice", and on 4 December 2014, decided to prohibit Crimean clubs to play in competitions organised by the Russian Football Union as from 1 January 2015 and for the region to be considered as a "special zone" for football purposes until further notice. In 2023 Crimean clubs began playing in the Russian system again, despite being a UEFA "special zone".
He presented the mechanism of the β-lactam development with proton sponge as the stoichiometric base, and also discussed the kinetic analysis of the catalyzed reaction of alkenes with α-imino esters. Lectka has studied the transition-metal catalyzed amide isomerization and peptide folding. He presented the first spectroscopic and crystallographic proof of copper(II)-sodium coordination in tertiary amides and discussed the role of side chain in substituted prolines as a binding site for copper. Lectka's research during his term at Johns Hopkins University also focused on enantioselective halogenation, cooperative asymmetric catalysis, the medicinal chemistry of fluorinated molecules, and studies on asymmetric catalysis on sequentially-linked columns leading to synthesis machines. He conducted research on the chemistry of [C-F-C] fluoronium ions and later reported first spectroscopic evidence for fluoronium ions in a solution. Lectka has also worked on metal-catalyzed aliphatic fluorination and site-selective aliphatic fluorination. Lectka has also established the use of fluorine as a through-space activating substituent for aromatic substitution.
== Signaling pathway == The essential function of the TCR complex is to identify specific bound antigen derived from a potentially harmful pathogen and elicit a distinct and critical response. At the same time it has to ignore any self-antigen and tolerate harmless antigens such as food antigens. The signal transduction mechanism by which a T cell elicits this response upon contact with its unique antigen is termed T-cell activation. Upon binding to pMHC, the TCR initiates a signaling cascade, involving transcription factor activation and cytoskeletal remodeling resulting in T-cell activation. Active T cells secrete cytokines, undergo rapid proliferation, have cytotoxic activity and differentiate into effector and memory cells. When the TCR is triggered, T cells form an immunological synapse allowing them to stay in contact with the antigen presenting cell for several hours. On a population level, T-cell activation depends on the strength of TCR stimulation, the dose–response curve of ligand to cytokine production is sigmoidal. However, T-cell activation on a single cell level can be characterized by a digital switch-like response, meaning the T cell is fully activated if the stimulus is higher than a given threshold; otherwise the T cell stays in its non-activated state. There is no intermediate activation state. The robust sigmoid dose-response curve on population level results from individual T cells having slightly different thresholds. T cells need three signals to become fully activated.
No candidate from PEJUANG or Gerakan Tanah Air secured a seat. He later said that his party's plans "had to be dropped" and he would shift his focus to writing about Malaysian history. In February 2023, Mahathir and 13 other members of PEJUANG (leaving his own son as the sole leader of that party) left the party and joined Parti Bumiputera Perkasa Malaysia (Putra). Later in 2023, Mahathir began promoting a "Malay Proclamation", aimed at uniting Malays. He met with PAS and PN leaders to garner support for the 12-point document listing political, economic and social issues. Mahathir was questioned by police over this campaign under the Malaysian Penal Code, for carrying out "activities that undermine parliamentary democracy". Mahathir also left GTA, criticising the coalition for its poor performance in the election. He supported Perikatan Nasional, the coalition that had ousted him in 2020, in six state elections and was named its "unofficial adviser" for the four state governments under its control. On 31 August 2024, Mahathir attended the Merdeka Day celebration in Putrajaya in his personal capacity, as he was not officially invited by the government. His presence at the event, where he was warmly received by the crowd, sparked public debate. Prominent academic Chandra Muzaffar criticised the government's decision, describing it as a breach of Malaysian etiquette and values, particularly given Mahathir's status as the country's longest-serving prime minister.
Sources: en.wikipedia.org
Tulips (Tulipa) also have a long cultural tradition, particularly in the Islamic world. The Persian word for tulips, lâleh (لاله), was borrowed into Turkish and Arabic as lale. In Arabic letters, lale is written with the same letters as Allah, and is used to denote God symbolically. Tulips became widely used in decorative motifs on tiles, fabrics, and ceramics in Islamic art and the Ottoman Empire in particular, and were revered in poetry, such as that of Omar Khayam in the twelfth century. Tulips were an essential part of the gardens of Persia, having been cultivated from the Steppes. As the Seljuks – Oghuz-Turkic leaders originated from the steppes – moved to Persia, and then west, they took tulips with them to Turkey, where many escaped cultivation and became naturalised. Today there are a number of places in Turkey called Laleli (‘with tulips’). Tulips first appeared in the decorative arts in Turkey in the thirteenth century and flourished under the Ottomans, in particular in the royal palaces, and was adopted by the Osmans as their symbol. Further species were collected from Persia and the spreading Ottoman Empire saw to it that tulip culture also spread. By the sixteenth century it was a national symbol, hence the designation "Tulip era", by which time they were becoming of economic importance.
N-Terminal domain (aa1-144): stabilized interactions to form tetramers Coiled-coil domain (aa145-330): interacts with chaperones and facilitates protein-protein interactions for transcriptional regulation DNA binding domain (aa331-496): permits binding to consensus gamma-interferon activation sequence (GAS) Linker domain (aa497-592): stabilizes DNA binding Src Homology 2 domain (aa593-685): mediates receptor-specific recruitment and STAT dimerization via phosphorylated tyrosine residue Transcriptional activation domain (aa702-794): interacts with critical co-activators In addition to the six functional domains, specific amino acids have been identified as key mediators of STAT5a function. Phosphorylation of tyrosine 694 and glycosylation of threonine 92 are important for STAT5a activity. Mutation of serine 710 to phenylalanine results in constitutive activation.
1993/1130) Dundee Teaching Hospitals National Health Service Trust (Appointment of Trustees) Order 1993 (S.I. 1993/1131) Caithness and Sutherland National Health Service Trust (Appointment of Trustees) Order 1993 (S.I. 1993/1132) Southern General Hospital National Health Service Trust (Appointment of Trustees) Order 1993 (S.I. 1993/1133) Stirling Royal Infirmary National Health Service Trust (Appointment of Trustees) Order 1993 (S.I. 1993/1134) Victoria Infirmary National Health Service Trust (Appointment of Trustees) Order 1993 (S.I. 1993/1135) West Lothian National Health Service Trust (Appointment of Trustees) Order 1993 (S.I. 1993/1136) Yorkhill National Health Service Trust (Appointment of Trustees) Order 1993 (S.I. 1993/1137) North Ayrshire and Arran National Health Service Trust (Appointment of Trustees) Order 1993 (S.I. 1993/1138) Monklands and Bellshill Hospitals National Health Service Trust (Appointment of Trustees) Order 1993 (S.I. 1993/1139) Ayrshire and Arran Community Health Care National Health Service Trust (Appointment of Trustees) Order 1993 (S.I. 1993/1140) Essex and Greater London (County and London Borough Boundaries) Order 1993 (S.I. 1993/1141) Croydon, Lambeth and Southwark (London Borough Boundaries) Order 1993 (S.I. 1993/1147) Greater London and Surrey (County and London Borough Boundaries) Order 1993 (S.I. 1993/1148) Coast Protection (Variation of Excluded Waters) Regulations 1993 (S.I. 1993/1149) Income-related Benefits Schemes (Miscellaneous Amendments) (No. 2) Regulations 1993 (S.I.
== Cautions == Numerous warnings must be examined before melarsoprol treatment can be initiated. Prior to initiation, the following must be noted: glucose-6-phosphate dehydrogenase deficiency, kidney or liver disease, cardiac problems (high blood pressure, irregular beating of the heart or arrhythmias, any damage to the heart muscles and potential signs of heart failure), preexisting nervous system disorders, and any signs of leprosy. Routine laboratory testing is needed before and after melarsoprol initiation. Laboratory parameters for both therapeutic effects and toxic effects need to be evaluated. Blood analysis is used to detect the presence of trypanosomes. An evaluation of the cerebrospinal fluid via a lumbar puncture is also used to determine an individual's white blood count and level of protein. These are diagnostic criteria such that the presence of trypanosomes, an elevated white blood count greater than five per microliter, or a protein content greater than 40 mg are considered abnormal and initiation should be considered. Continuous cerebrospinal fluid evaluation should be repeated every six months for at least three years in individuals that have undergone melarsoprol treatment. To assess potential concerns related to toxicity, the following should be completed: a complete blood count, an assessment of electrolyte levels, liver and kidney function tests, and a urinalysis to detect the appearance, concentration and content of the urine. Melarsoprol should be given using glass syringes (if they can be reliably sterilized).
Sources: en.wikipedia.org
In 2021, Lloyd Austin, on behalf of the United States, thanked his counterpart in the Philippines Delfin Lorenzana for retaining the 70-year-old visiting forces agreement between the two nations. In 2023, four new bases were announced in the Philippines.
== Prosperity == The Legatum Institute's yearly Legatum Prosperity Index for 2015 ranks Thailand 48 of 142 (1=best, 142=worst) nations. The ranking is based on a variety of factors including wealth, economic growth, education, health, freedom, personal well-being, and quality of life. Other ASEAN nations ranked were Singapore, 17; Malaysia, 44; Vietnam, 55; Indonesia, 69; Philippines, 74; Laos, 95; Cambodia, 112.
=== Post–surgical recovery === Convalescence The rhinoplasty patient returns home after surgery, to rest, and allow the nasal cartilage and bone tissues to heal the effects of having been forcefully cut. Assisted with prescribed medications—antibiotics, analgesics, steroids—to alleviate pain and aid wound healing, the patient convalesces for about 1-week, and can go outdoors. Post-operatively, external sutures are removed at 4–5 days; the external cast is removed at 1-week; the stents are removed within 4–14 days; and the "panda eyes" periorbital bruising heal at 2-weeks. If an alar base reduction is performed conjunctively within the Rhinoplasty, these sutures need to be removed within 7–10 days post operatively. Throughout the first year post-operative, in the course of the rhinoplastic wounds healing, the tissues will shift moderately as they settle into being a new nose. Furthermore, as rhinoplasty climbs the ladder of surgical procedures performed to achieve an aspired appearance, especially amongst women, the relationship between body image and mental state must be examined in order to destigmatize motives behind the surgical intervention.
=== Activators === 1-Aminoanthracene and propofol - activate SIRT2 activity on some substrates but inhibit it on others Nicotinamide riboside - activates SIRT2, but non selective Metformin - activates SIRT2 but has several other mechanisms of action as well SRT1720 - primarily a SIRT1 activator, but also weakly activates SIRT2 Hexapeptide-12 (VGVAPG) - upregulates SIRT2 gene expression through an indirect pathway
Despite the bleak political situation (from the standpoint of Polish patriots), economic progress was made in the lands taken over by foreign powers because the period after the Congress of Vienna witnessed a significant development in the building of early industry. Economic historians have made new estimates on GDP per capita, 1790–1910. They confirm the hypothesis of semi-peripheral development of Polish territories in the 19th century and the slow process of catching-up with the core economies.
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.
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.