The short version of nootropic fits in a sentence. The long version — which is the one that helps — is below.
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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.
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.
| 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 |
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.
Regulatory status varies sharply by country. Semax is registered for medical use in Russia, where it appears in formularies as a nasal solution, and it also holds registration in a small number of neighbouring states. It has no approval from the United States Food and Drug Administration or the European Medicines Agency, and it is not a scheduled controlled substance in most jurisdictions. Elsewhere it circulates mainly as laboratory material, so purity documentation comes from suppliers rather than from a national pharmacopoeia.
Semax is a synthetic peptide created in the Soviet Union during the early 1980s by researchers working in Moscow. It was built from the short adrenocorticotropic hormone fragment known as ACTH(4-10), and the chain was then extended with three additional amino acids. The resulting molecule was named semax and entered clinical use in Russia in 1994. It is generally described as a nootropic and neuroprotective agent rather than as a hormone analogue.
These announcements caused increases in world gas prices, which analysts said was a part of the Iranian Government's plan to apply pressure on the world to stop the war. On 6 March, Qatar warned that if the war continues, other Gulf energy producers may be forced to halt exports and declare Force Majeure. Also on 6 March, it was reported that according to satellite imagery analysis by both Bloomberg and the Energy Economics and Society Research Institute in Tokyo, that Ras Laffan, the main gas facility in Qatar, appears not to have been damaged before the "unprecedented shutdown" which sent fuel prices higher. The United States, buffered by domestic production, faced less direct impact but saw petrol prices rise 5–10 cents per gallon daily. On 18 March, Iran hit Qatar's inactive Ras Laffan Industrial City LNG complex, causing a 17% reduction in Qatar's LNG production capacity. The damages from this attack would take 3–5 years to fix. Consequently, LNG spot prices in Asia increased by over 140 %. The impacts of the conflict are similar to the 1970s energy crisis, including acute supply shortages, currency volatility, inflation, and heightened risks of stagflation and recession. According to the International Energy Agency's World Energy Investment 2026 report, the crisis was prompting a reshaping of global energy investment and accelerating diversification away from Middle Eastern supply routes.
== Education and early career == LeBlanc received his bachelor's degree in biology from the University of Massachusetts Dartmouth in 1975, followed by a Master's in Biology from Bridgewater State University in 1981. Following his Bachelor's, he started his professional career as an Aquatic Toxicologist at EG&G Bionomics in Wareham, Massachusetts in 1975, a position he held for five years. Subsequently, in 1980, he was appointed as the Director of Toxicology and held that position until 1983. He then joined the University of South Florida in Tampa in 1983 as a Research Associate and received his Ph.D. in biology in 1986. From 1986 to 1989 he served as a Research Fellow in the Department of Biological Chemistry & Molecular Pharmacology and Dana-Farber Cancer Institute at Harvard Medical School where he completed his post-doctoral training.
== In popular culture == The 1896 Gilbert and Sullivan operetta The Grand Duke features sausage rolls as a plot device, where conspirators recognise one another by eating sausage rolls. From 2018 to 2022, English YouTuber LadBaby had five consecutive Christmas number ones on the UK Singles Chart with cover versions of songs where the lyrics were rewritten to reference sausage rolls, including "I Love Sausage Rolls", "Don't Stop Me Eatin'", and "Sausage Rolls for Everyone".
A review of lichen taxonomic literature from 2018 to 2020 found that of over 700 new species published, only 39% included any DNA sequences. The most commonly used gene was the ITS (present in roughly 82% of those that had molecular data), while only about 10% of new species were supported by three or more genes. These figures show that while multilocus sequencing underpins higher-level systematics, species-level descriptions (alpha taxonomy) often remain constrained by practical limits on sequencing or by the sufficiency of morphological evidence. Sanger-era phylogenetics laid the groundwork for later genomic studies. By the late 2000s lichenologists had a working framework for most major lineages and clearer criteria for natural versus artificial groups. The framework relied on what now seem small datasets—only a few kilobases per species—yet these sequences resolved many relationships. Although some 2010-era authors questioned the value of small multigene matrices, Lücking (2020) contends that sound sampling and analysis can outweigh sheer data volume. By the early 2020s, many new species—even some higher taxa—are still described from a few gene regions plus morphology, a practise that remains practical where large-scale sequencing is not yet feasible. The Sanger era showed that modest molecular datasets could overturn classifications—splitting some genera, merging others—and it supplied a scaffold for later genome-scale studies.
Argon has approximately the same solubility in water as oxygen and is 2.5 times more soluble in water than nitrogen. Argon is colorless, odorless, nonflammable and nontoxic as a solid, liquid or gas. Argon is chemically inert under most conditions and forms no confirmed stable compounds at room temperature. Although argon is a noble gas, it can form some compounds under various extreme conditions. Argon fluorohydride (HArF), a compound of argon with fluorine and hydrogen that is stable below 17 K (−256.1 °C; −429.1 °F), has been demonstrated. Although the neutral ground-state chemical compounds of argon are presently limited to HArF, argon can form clathrates with water when atoms of argon are trapped in a lattice of water molecules. Ions, such as ArH+, and excited-state complexes, such as ArF, have been demonstrated. Theoretical calculation predicts several more argon compounds that should be stable but have not yet been synthesized.
Sources: en.wikipedia.org
Metformin, sold under the brand name Glucophage, among others, is the main first-line medication for the treatment of type 2 diabetes, particularly in people who are overweight. It is also used in the treatment of polyendocrine metabolic ovarian syndrome, and is sometimes used as an off-label adjunct to lessen the risk of metabolic syndrome in people who take antipsychotic medication. It has been shown to inhibit inflammation, and is not associated with weight gain. Metformin is taken by mouth. Metformin is generally well tolerated. Common adverse effects include diarrhea, nausea, and abdominal pain. It has a small risk of causing low blood sugar. High blood lactic acid level (acidosis) is a concern if the medication is used in overly large doses or prescribed to people with severe kidney problems. Metformin is a biguanide anti-hyperglycemic agent. It works by decreasing glucose production in the liver, increasing the insulin sensitivity of body tissues, and increasing GDF15 secretion, which reduces appetite and caloric intake. Metformin was first described in the scientific literature in 1922 by Emil Werner and James Bell. French physician Jean Sterne began the study in humans in the 1950s. It was introduced as a medication in France in 1957. It is on the World Health Organization's List of Essential Medicines. It is available as a generic medication. In 2023, it was the second most commonly prescribed medication in the United States, with more than 85 million prescriptions. In Australia, it was one of the top 10 most prescribed medications between 2017 and 2023.
Nicotine in tobacco can form carcinogenic tobacco-specific nitrosamines through a nitrosation reaction. This occurs mostly in the curing and processing of tobacco. Nicotine in the mouth and stomach can react to form N-nitrosonornicotine, a type 1 carcinogen, suggesting that oral consumption of non-tobacco forms of nicotine, such as nicotine gum, may be carcinogenic.
== External links == "Imipenem". Drug Information Portal. U.S. National Library of Medicine. Archived from the original on 10 July 2017. "Cilastatin". Drug Information Portal. U.S. National Library of Medicine. Archived from the original on 23 January 2017. "Relebactam". Drug Information Portal. U.S. National Library of Medicine. Archived from the original on 5 June 2020.
These techniques can be highly multiplexed for simultaneous quantification of many targets (panels of up to 38 markers) in single cells. Antibody-DNA quantification: another antibody-based method converts protein levels to DNA levels. The conversion to DNA makes it possible to amplify protein levels and use NGS to quantify proteins. In one such approach, two antibodies are selected for each protein needed to be quantified. The two antibodies are then modified to have single stranded DNA connected to them that are complementary. When the two antibodies bind to a protein the complementary strands will anneal and produce a double stranded segment of DNA that can then be amplified using PCR. Each pair of antibodies designed for one protein is tagged with a different DNA sequence. The DNA amplified from PCR can then be sequenced, and the protein levels quantified.
Sources: en.wikipedia.org
=== India === The Indian Armed Forces issues a host of rations including the One Man Combo Pack Ration, Mini Combo Pack, Survival Ration, and Main Battle Tank Rations. The shelf-life of the ration is 12 months. India has adopted retort processing technology for combat rations. The rations use pre-cooked thermostabilized entrees in a plastic-foil laminate retort pouch. The ration does not require cooking and the contents may be eaten cold, though warming is preferred. An entire day's worth of food, plus accessory items, is packed inside a heavy-duty olive green plastic bag with pasted on label. The menu consists of several different Vegetarian and Non-Vegetarian products that cater to Indian tastes, such as sooji halwa, chapatis, tea mix, chicken biryani, chicken curry, Kebab, Tandoori, Panneer, Organic Egg, Butter naan, mutton biryani, Mutton curry, Vegetable biryani, rajma curry, dal fry, jeera rice, Dal makhani, vegetable pulav and mixed vegetable curry, alongside pickled hot seasoning, in small plastic pouches. The One Man Combo Pack consists of early morning tea, breakfast, mid morning tea, lunch, evening tea, and dinner. The menus feature both dehydrated and ready-to-eat products, and include a folding stove and hexamine fuel tablets. The ration weighs 880 grams and provides 4,100 kcal (17,000 kJ). The Mini Combo Pack is a simplified version of the One Man Combo Pack, weighing 400 g and providing 1,520 kcal (6,400 kJ). The Survival Ration consists of a soft bar and chikki.
Paper-based microfluidics are microfluidic devices that consist of a series of hydrophilic cellulose or nitrocellulose fibers that transport fluid from an inlet through the porous medium to a desired outlet or region of the device, by means of capillary action. This technology builds on the conventional lateral flow test which is capable of detecting many infectious agents and chemical contaminants. The main advantage of this is that it is largely a passively controlled device unlike more complex microfluidic devices. Development of paper-based microfluidic devices began in the early 21st century to meet a need for inexpensive and portable medical diagnostic systems.
Other types of atypical work contract include part-time, fixed-term and labour hire staff. First, since the Workplace Relations Act 1996 section 526, awards have been able to provide equal treatment for part-time workers. Part-time employees are often also casual employees and not treated equally regarding holidays and job security, and this has a negative disproportionate impact on women. Second, fixed-term staff are treated unequally compared to permanent staff in that the simple expiry of a fixed term counts as an unchallengeable reason for dismissal, no matter how capriciously or maliciously motivated the reasons are for non-renewal. Third, under the FWA 2009 sections 306C-G there is a limited right to equal treatment for employees contracted through a labour hire firm compared to directly hired employees, after application to the Fair Work Commission. However unlike wealthier OECD countries the right is not automatic, and unavailable for workers of small businesses.
Methemoglobinemia, or methaemoglobinaemia, is a condition of elevated methemoglobin in the blood. Symptoms may include headache, dizziness, shortness of breath, nausea, poor muscle coordination, and blue-colored skin (cyanosis). Complications may include seizures and heart arrhythmias. Methemoglobinemia can be due to certain medications, chemicals, or food, or it can be inherited. Substances involved may include benzocaine, nitrites, or dapsone. The underlying mechanism involves some of the iron in hemoglobin being converted from the ferrous [Fe2+] to the ferric [Fe3+] form. The diagnosis is often suspected on the basis of symptoms and a low blood oxygen that does not improve with oxygen therapy. Diagnosis is confirmed by a blood gas analysis. Treatment is generally with oxygen therapy and methylene blue. Other treatments may include vitamin C, exchange transfusion, and hyperbaric oxygen therapy. Outcomes are generally good with treatment. Methemoglobinemia is relatively uncommon, with most cases being acquired rather than genetic.
Those who report a false claim against the federal government, and suffer adverse employment actions as a result, may have up to six years (depending on state law) to file a civil suit for remedies under the US False Claims Act (FCA). Under a qui tam provision, the "source" for the report may be entitled to a percentage of what the government recovers from the offenders. However, the "source" must also be the first to file a federal civil complaint for recovery of the federal funds fraudulently obtained, and must avoid publicizing the claim of fraud until the US Justice Department decides whether to prosecute the claim itself. Such qui tam lawsuits must be filed under seal, using special procedures to keep the claim from becoming public until the federal government makes its decision on direct prosecution. Whistleblowers acting under the FCA are the primary enforcement tool used by the U.S. Department of Justice to target fraud, including overbilling to government programs like Medicare, Medicaid, and Tricare.
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 a short synthetic peptide built from seven amino acids: methionine, glutamic acid, histidine, phenylalanine and three prolines. The sequence derives from the 4-10 fragment of adrenocorticotropic hormone with an added proline-glycine-proline tail. No plant or animal extract is involved; the material is produced by solid-phase peptide synthesis.