peptide synthesis comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2026-07-03. Numbers and descriptions here follow the published literature rather than marketing material.
Terminology around the compound varies by source. It appears in catalogues and papers as Semax, as the heptapeptide ACTH(4-7)-Pro-Gly-Pro, and under various alphanumeric laboratory codes used by individual suppliers. These names refer to the same sequence but may imply different salt forms, purity grades, or counter-ions. Peptide databases usually list the free base mass, while product descriptions sometimes report acetate or trifluoroacetate salts with a different formula weight. Because naming conventions for research peptides are not standardised across vendors, checking the declared sequence and measured mass is more reliable than relying on a trade name alone.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. Its design combines the ACTH(4-7) core fragment with a C-terminal Pro-Gly-Pro extension, a modification intended to improve stability and prolong activity. The molecule is hydrophilic, carries no lipid chains or glycosylation, and has a theoretical mass just over 810 daltons in its free form. All seven residues are proteinogenic amino acids, so no non-natural building blocks appear in the backbone. A free N-terminal methionine and C-terminal proline define the unmodified parent peptide.
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.
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 |
|---|---|---|
| Chemical class | Synthetic heptapeptide | ACTH(4-7) analogue |
| Sequence | Met-Glu-His-Phe-Pro-Gly-Pro | Free N terminus, unmodified side chains |
| Molecular weight | 813.9 Da | Free base; salt forms differ |
| Appearance | White to off-white powder | Lyophilised solid |
| Solubility | Freely soluble in water | Hydrophilic; polar solvents preferred |
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.
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.
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.
=== Casting === In February 2024, it was announced that Jessica Green had joined the cast of The Librarians: The Next Chapter. In March, it was announced Christian Kane would reprise the role of Jacob Stone, and that British actors Callum McGowan, Olivia Morris, Bluey Robinson, and Caroline Loncq had also joined the cast of the series.
Partial smooth muscle differentiation of a fibroblastic cell Activation of a stellate cell (e.g. hepatic Ito cells or pancreatic stellate cells). Loss of contractile phenotype (or acquisition of "synthetic phenotype") of a smooth muscle cell. Direct myofibroblastic differentiation of a progenitor cell resident in a stromal tissue. Homing and recruitment of a circulating mesenchymal precursor which can directly differentiate as above or indirectly differentiate through the other cell types as intermediates. Epithelial to mesenchymal transdifferentiation (EMT) of an epithelial cell. Perhaps the most studied pathway of myofibroblast formation is TGF-beta1 dependent differentiation from fibroblast cells. Activation of the TGF-beta receptor 1 and TGF-beta receptor 2 leads to induction of the canonical SMAD2/SMAD3 pathway. Together with the co-activation of the non-canonical EGFR pathway, these events lead to upregulation of the ACTA2 gene and subsequent alpha smooth muscle actin protein production. Several regulators of the myofibroblast differentiation pathway have been described, including hyaluronan and CD44 co-receptor activation of EGFR.
Cora, based in Montreal, has 128 restaurants and was started by Cora Tsouflidou in 1987. It can be found in every Canadian province (but PEI). In 2008, the restaurant changed its name from Cora's breakfast and lunch (in French, Chez Cora déjeuners) to Cora. Serving such breakfast items as eggs, crepes and French toast, it is known for its all day breakfast and heaping mounds of fruit.
[D]espite massive deployment of police and other resources to implement the UN Conventions, production and consumption of, and trafficking in, prohibited substances have increased exponentially over the past 30 years, representing what can only be described as a failure, which the police and judicial authorities also recognise as such ... [T]he policy of prohibiting drugs, based on the UN Conventions of 1961, 1971 and 1988, is the true cause of the increasing damage that the production of, trafficking in, and sale and use of illegal substances are inflicting on whole sectors of society, on the economy and on public institutions, eroding the health, freedom and life of individuals. The road to repeal would be difficult. Individual nations could withdraw from the treaty under the provisions of Article 30. However, as former UN drug official Cindy Fazey notes, the convention has no termination clause, and therefore would remain in effect even if only one signatory remained. The Transnational Radical Party report noted that denunciation is the only route to changing the control regime established by the treaty:
Sources: en.wikipedia.org
== Places == Šip (Pale), Bosnia and Herzegovina Šip (Višegrad), Bosnia and Herzegovina Novi Sip, Serbia Simferopol International Airport (IATA: SIP), an airport in Crimea Suzhou Industrial Park, in Suzhou, China
==== Opioid withdrawal ==== As early as the 19th century, kratom was in use for the treatment of opioid addiction and withdrawal. As of 2018, a review of mental health aspects of kratom use mentioned opioid replacement and withdrawal as primary motivations for kratom use: almost 50% of the approximately 8,000 kratom users surveyed indicated kratom use that resulted in reduced or discontinued use of opioids. Some animal models of opioid withdrawal suggest mitragynine can suppress and ameliorate withdrawal from other opioid agonists (e.g., after chronic administration of morphine in zebra fish).
== See also == 1970–1979 world oil market chronology 1970s energy crisis 1973 oil crisis 1979 oil crisis 1980s oil glut 2000s energy crisis Economic impact of the 2026 Iran war Global energy crisis (2021–2023) 2025–2026 Russian fuel crisis
== External links == Top words from 2000 – present @ Global Language Monitor Word of the Year Archive @ Macquarie Dictionary Word of the Year Archive @ Merriam-Webster Word of the Year Archive @ OxfordWords blog Austrian Word of the Year Canadian Word of the Year Liechtenstein Word of the Year Switzerland Word of the Year Dictionary.com word of the year @ Dictionary.com
=== Dietary therapy === Initial attempts at dietary therapy in ALD involved restricting the intake of very-long chain fatty acids (VLCFA). Dietary intake is not the only source for VLCFA in the body, as they are also synthesized endogenously. This dietary restriction did not impact the levels of VLCFA in plasma and other body tissues. After the realization that endogenous synthesis was an important contribution to VLCFA in the body, efforts at dietary therapy shifted to inhibiting these synthetic pathways in the body. The parents of Lorenzo Odone, a boy with ALD, spearheaded efforts to develop a dietary treatment to slow the progression of the disease. They developed a mixture of unsaturated fatty acids (glycerol trioleate and glyceryl trierucate in a 4:1 ratio), known as Lorenzo's oil that inhibits elongation of saturated fatty acids in the body. Supplementation with Lorenzo's oil has been found to normalize the VLCFA concentrations in the body, although its effectiveness at treating the cerebral manifestations of the disease is still controversial and unproven. Trials with Lorenzo's oil have shown that it does not stop the neurological degradation in symptomatic patients, nor does it improve adrenal function, but asymptomatic patients, and speculatively AMN variants without cerebral involvement, as well as female carriers may benefit from early intake of oleic and erucic acids in addition to VLCFA restriction.
Sources: en.wikipedia.org
A study by Todd Harrison of the American Enterprise Institute estimated that the cost of developing and operating the Golden Dome until 2045 could range from $252 billion to $3.6 trillion, depending on how expansive the system is. Advocates of the Golden Dome describe a national missile defense shield as "a strategic imperative." In November 2025, United States Strategic Command nominee Richard Correll testified that the Golden Dome was key to ensure U.S. nuclear second strike capability. Critics suggest the costs for these capabilities have been underestimated, creating a "multi-trillion-dollar gap between rhetoric and reality." Article I of the Outer Space Treaty states that space is "the province of all mankind" and forbids placing weapons of mass destruction in orbit. Some permanent members of the United Nations Security Council have expressed objections to the Golden Dome program, citing inconsistencies with this principle. The program's use of space for attacking targets on the ground ("left of launch" preemptive strike capabilities) has led to discussion over the legality under international law. Some analysts argue the integration of such offensive payloads into low Earth orbit (LEO) introduces a severe economic and strategic instability driven by the harsh environmental constraints of the domain. LEO satellites function as "perishable munitions" due to rapid orbital decay, creating a “sunk cost trap” for high-value assets like the C-HGB, which has a procurement cost of approximately $41 million per unit according to the Congressional Budget Office.
== Interaction with Antibiotics == The ribosomal tunnel contains binding sites for clinically important antibiotics, such as macrolides or streptogramins. Antibiotics bind to the inner part of the ribosomal tunnel, either near the peptidyl transferase center or near the constriction site. Despite the original belief that macrolide binding to the tunnel causes obstruction, it has been shown that the tunnel remains permeable. Antibiotics instead stabilize the catalytic site of the ribosome in a conformation that is unproductive for peptide bond formation, causing translational arrest. Translational arrest of the ribosome may also be dependent on the sequence of the nascent peptide, as has been observed, for example with chloramphenicol.
Primary hypercortisolism (Cushing's syndrome): excessive levels of cortisol Secondary hypercortisolism (pituitary tumor resulting in Cushing's disease, pseudo-Cushing's syndrome) Primary hypocortisolism (Addison's disease, Nelson's syndrome): insufficient levels of cortisol Secondary hypocortisolism (pituitary tumor, Sheehan's syndrome)
Although benzodiazepines are much safer in overdose than their predecessors, the barbiturates, they can still cause problems in overdose. Taken alone, they rarely cause severe complications in overdose; statistics in England showed that benzodiazepines were responsible for 3.8% of all deaths by poisoning from a single drug. However, combining these drugs with alcohol, opiates or tricyclic antidepressants markedly raises the toxicity. The elderly are more sensitive to the side effects of benzodiazepines, and poisoning may even occur from their long-term use. The various benzodiazepines differ in their toxicity; temazepam appears most toxic in overdose and when used with other drugs. The symptoms of a benzodiazepine overdose may include; drowsiness, slurred speech, nystagmus, hypotension, ataxia, coma, respiratory depression, and cardiorespiratory arrest. A reversal agent for benzodiazepines exists, flumazenil (Anexate), itself belonging to the chemical class of benzodiazepines. Its use as an antidote is not routinely recommended because of the high risk of resedation and seizures. In a double-blind, placebo-controlled trial of 326 people, 4 people had serious adverse events and 61% became resedated following the use of flumazenil. Numerous contraindications to its use exist. It is contraindicated in people with a history of long-term use of benzodiazepines, those having ingested a substance that lowers the seizure threshold or may cause an arrhythmia, and in those with abnormal vital signs.
=== IBP Golden Pillar of Law Award === Duterte was conferred the Golden Pillar of Law Award on September 15, 2025, from the Davao City chapter of the Integrated Bar of the Philippines (IBP). Human rights lawyers and activists urged the IBP to revoke the award viewing that his role in the war on drugs contradicts with the spirit of the recognition. The national office of the IBP maintained Duterte's presumed innocence as it "do not confer guilt or grace beyond the reach of law" but nevertheless pledge to review rules concerning the award. IBP Davao insist that Duterte satisfy the criteria for the award based on professional longevity and standing status and that the Golden Pillar award does not "serve as an endorsement of political acts or personal ideologies".
Sources: en.wikipedia.org
It is a synthetic seven-amino-acid peptide built from the ACTH(4-7) sequence plus a Pro-Gly-Pro tail. It belongs to the family of short ACTH fragments studied for nervous-system effects. Its backbone contains only standard amino acids.
It contains the 4-7 fragment of adrenocorticotropic hormone extended at the C terminus. That truncation removes the region associated with steroidogenic activity. The design intent was to keep neurotrophic properties while avoiding full hormonal effects.
No natural source of the intact heptapeptide is known. It is produced by solid-phase peptide synthesis. Some related ACTH fragments arise as hormone processing products, but the Pro-Gly-Pro extension is a designed addition rather than a natural sequence.
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.