If you have been reading about peptide synthesis and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Updated 2025-10-24. 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.
Laboratory descriptions of the material are consistent across suppliers. It appears as a white to off-white lyophilized powder that dissolves readily in water and in polar organic solvents such as dimethyl sulfoxide. Aqueous solutions are clear and colorless at low concentrations. Because the peptide contains methionine, oxidation at the sulfur atom is a recognized degradation pathway, and handling notes usually call for protected, desiccated storage. Reported purity for research-grade lots is generally above 95 percent as measured by reversed-phase high-performance liquid chromatography.
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.
| 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 |
== Non-traditional sales == Due to their limited restaurant locations throughout the United States, White Castle had developed a cult following among former customers who develop a craving for their hamburger in areas not served by their restaurants. By the early 1980s, these customers would go to extreme length to obtain White Castle burgers, such as having friends and relatives ship the burgers to them. In November 1980, the town officials of Fountain Hills, Arizona, placed an order for 10,000 hamburgers to be sold at a town festival as part of a fundraiser. The following year, the town created an annual festival that was held each May called Midwest Fest or Midwest Festival in which 100,000 or more hamburgers were purchased and sold as part of a fundraiser. By the middle of the decade, several other western cities were purchasing hundreds of thousands of burgers at a time for fundraisers. In 1982, a Dayton disc jockey sent 3,000 burgers to 1,200 U.S. Marines stationed in Beirut. In late 1982, White Castle established a toll free phone line in which customers can order as few as 50 burgers to be shipped frozen to any metropolitan area in the United States serviced by Federal Express for as low as $57 as part of a program called "Hamburgers to Fly". By early 1983, White Castle was shipping 10,000 hamburgers per week via FedEx. Based on the success of the sale of hamburgers shipped via air express, White Castle decided to expand their frozen hamburgers distribution by selling the burgers through supermarkets.
Tositumomab – Bexxar – 2003 – CD20 Mogamulizumab – Poteligeo – August 2018 – CCR4 Moxetumomab pasudotox – Lumoxiti – September 2018 – CD22 Cemiplimab – Libtayo – September 2018 – PD-1 Polatuzumab vedotin – Polivy – June 2019 – CD79B The bispecific antibodies have arrived in the clinic. In 2009, the bispecific antibody catumaxomab was approved in the European Union and was later withdrawn for commercial reasons. Others include amivantamab, blinatumomab, teclistamab, and emicizumab.
=== Occurrence in space === Nitriles are among the most abundant organic molecules in space, and more than ten distinct compounds have been unequivocally detected. Hydrogen cyanide was one of the first polyatomic species identified in space and occurs there relatively frequently and in substantial quantities. Other nitriles detected in space include acetonitrile and aminoacetonitrile, as well as butyronitrile, cyanoacetylene, and cyanopolyins containing two to five conjugated triple bonds. Hydrogen cyanide, cyanoacetylene, and cyanogen are present in the atmosphere of Saturn's moon Titan.
=== Foam === Topical corticosteroid foams are suitable for treating a range of skin conditions that respond to corticosteroids. These foams are typically simple to apply, which can lead to better patient compliance and, in turn, improve treatment results for those who favor a more convenient and cleaner topical option. Foam can be typically seen with topical steroids marketed for the scalp.
Sources: en.wikipedia.org
==== Quid chewing ==== The traditional method of chewing the leaves has continued in modern use. However, salvinorin A is generally considered to be inactive when orally ingested, as salvinorin A is effectively deactivated by the gastrointestinal system. Therefore, in what's understood to be a modern innovation, the 'quid' of leaves is held in the mouth as long as possible in order to facilitate absorption of the active constituents through the oral mucosa. 'Quid' refers to the fact that at the end of this method the user spits out the leaves rather than swallowing them because ingesting the leaves has no known effect. Chewing consumes more of the plant than smoking, and produces a longer-lasting experience.
An ex vivo histological examination showed that certain pore geometry and the pre-growing of chondrocytes (Cho) prior to implantation significantly improves the performance of the created 3D scaffolds. The achieved biocompatibility was comparable to the commercially available collagen membranes. The successful outcome of this study supports the idea that hexagonal-pore-shaped hybrid organic-inorganic micro-structured scaffolds in combination with Cho seeding may be successfully implemented for cartilage tissue engineering. Recently, tissue engineering has advanced with a focus on vascularization. Using Two-Photon Polymerization-based additive manufacturing, synthetic 3D microvessel networks are created from tubular hydrogel structures. These networks can perfuse tissues several cubic millimeters in size, enabling long-term viability and cell growth in vitro. This innovation marks a significant step forward in tissue engineering, facilitating the development of complex human tissue models.
The high fiber content provides water-absorbing and water-binding capabilities. Organic acids such as sorbitol act as humectants, provide dough and batter stability, and control water activity. Fruit sugars add sweetness, humectancy, and surface browning, and control water activity. Fruit acids, such as malic acid and tartaric acid, contribute to flavor enhancement. The high drying and processing temperatures, the intrinsic low pH of the fruit, and the low water activity (moisture content) in dried fruit make them a stable food.
From 21 December 2011, the EU extended trade restrictions to prevent the export of certain medicinal products for capital punishment, stating that "the Union disapproves of capital punishment in all circumstances and works towards its universal abolition".
== Terminology == In 1901, Jōkichi Takamine patented a purified extract from the adrenal glands, which was trademarked by Parke, Davis & Co in the US. The British Approved Name and European Pharmacopoeia term for this drug is hence adrenaline (from Latin ad, "on", and rēnālis, "of the kidney", from ren, "kidney"). However, the pharmacologist John Abel had already prepared an extract from adrenal glands as early as 1897, and he coined the name epinephrine to describe it (from Ancient Greek ἐπῐ́ (epí), "upon", and νεφρός (nephrós), "kidney"). As the term Adrenaline was a registered trademark in the US, and in the belief that Abel's extract was the same as Takamine's (a belief since disputed), epinephrine instead became the generic name used in the US and remains the pharmaceutical's United States Adopted Name and International Nonproprietary Name (though the name adrenaline is frequently used). The terminology is now one of the few differences between the INN and BAN systems of names. Although European health professionals and scientists preferentially use the term adrenaline, the converse is true among American health professionals and scientists. Nevertheless, even among the latter, receptors for this substance are called adrenergic receptors or adrenoceptors, and pharmaceuticals that mimic its effects are often called adrenergics. The history of adrenaline and epinephrine is reviewed by Rao.
Sources: en.wikipedia.org
There is a consensus among the world's major medical organizations and in the academic literature that circumcision is an efficacious intervention for HIV prevention in high-risk populations if carried out by medical professionals under safe conditions. In 2007, the WHO and the Joint United Nations Programme on HIV/AIDS (UNAIDS) recommended adolescent and adult circumcision as part of a comprehensive program for prevention of HIV transmission in areas with high endemic rates of HIV, as long as the program includes "informed consent, confidentiality, and absence of coercion"—known as voluntary medical male circumcision, or VMMC. In 2010, this expanded to routine neonatal circumcision, as long as the infant's parents consented. In 2020, the WHO again concluded that male circumcision is an efficacious intervention for HIV prevention and that male circumcision is an essential strategy, in addition to other measures, to prevent heterosexually acquired HIV infection in men. Eastern and southern Africa had a particularly low prevalence of circumcised males. This region has a disproportionately high HIV infection rate, with a significant number of infections stemming from heterosexual transmission. As a result, the promotion of prophylactic circumcision has been a priority intervention in that region since the WHO's 2007 recommendations. The International Antiviral Society–USA also suggests circumcision be discussed with men who have insertive anal sex with men, especially in regions where HIV is common.
One specialized form of fresh-produce train that existed in the UK was the milk train, which, using specialized chilled, glass-lined wagons, remained in service until 1981. Like many railways around the world, modern UK railways do ship specialized refrigerated containers on intermodal trains, with such trains now taking over the role again from long-distance trucking on hub-to-hub routes to reduce carbon footprint. DB Cargo UK runs Europe's longest-distance single-operator handled train from Valencia, Spain to Barking in East London twice weekly, in partnership with Eddie Stobart Logistics and retailer Tesco's, shipping fresh fruit and produce 1,800 km (1,118 mi) in refrigerated ISO containers.
== Date codes == The cases of MREs and their variants usually are marked with the production date in the American fashion: 2-digit Month / 2-digit Day / 4-digit Year (e.g., November 24, 1996 would be rendered as 11/24/1996). This is followed by the Lot Number, a four-digit Julian date code that is also repeated on the individual components in the MREs. The first digit is the last digit of the Year (e.g., 0 could be equal to 2010 or 2020, 1 could be equal to 2001 or 2011, and 9 could be equal to 2009 or 2019). The next 3 digits are equal to the day of the year (i.e., 001 to 366). "1068" could be equal to the 68th day of 2001 or 2011, for example March 9, 2001. "2068" could mean March 8, 2012 or March 9, 2022 (the 68th day of 2012 is March 8 due to the presence of a leap day). The cases are also stamped with the Inspection / Test Date, which is in the same format as the Packing Date (e.g., October 1994 would be rendered as "10/94"). Rations optimally must be kept in a cool, dry place during storage. If the rations are stored at 80° for 3 consecutive years, they would reach the end of their shelf life. They are often inspected by the U.S. Army veterinary food personnel and their shelf life may extend beyond the inspection test date. Rations are discarded after five years.
== Background == Crude oil contains sulfur in its composition, with the latter being the most abundant element after carbon and hydrogen. Depending on its source, the amount of sulfur present in crude oil can range from 0.05 to 10%. Accordingly, the oil can be classified as sweet or sour if the sulfur concentration is below or above 0.5%, respectively. The combustion of crude oil releases sulfur oxides (SOx) to the atmosphere, which are harmful to public health and contribute to serious environmental effects such as air pollution and acid rains. In addition, the sulfur content in crude oil is a major problem for refineries, as it promotes the corrosion of the equipment and the poisoning of the noble metal catalysts. The levels of sulfur in any oil field are too high for the fossil fuels derived from it (such as gasoline, diesel, or jet fuel ) to be used in combustion engines without pre-treatment to remove organosulfur compounds. The reduction of the concentration of sulfur in crude oil becomes necessary to mitigate one of the leading sources of the harmful health and environmental effects caused by its combustion. In this sense, the European Union has taken steps to decrease the sulfur content in diesel below 10 ppm, while the US has made efforts to restrict the sulfur content in diesel and gasoline to a maximum of 15 ppm. The reduction of sulfur compounds in oil fuels can be achieved by a process named desulfurization.
=== Sweetpea Golightly === Sweetpea Golightly (Miriam Petche) is a new Pierpoint hire with TikTok and OnlyFans businesses on the side. She is revealed to have had an affair with Rishi, who subscribes to her OnlyFans page. Sweetpea is shown to be a shrewd and competent trader despite her seemingly carefree and social media-obsessed personality. She eventually discovers that a hefty debt Pierpoint issued five years ago to fund their pivot to ESG is reaching maturity, but cannot be paid off since the firm's ESG investments are not making any returns. She reports this to Eric, who tells her to keep it quiet; Harper later overhears Sweetpea telling Yasmin in the bathroom, and uses this information to plan a short of Pierpoint. After Pierpoint is sold to Al-Mi'raj Holdings, Sweetpea leaves the firm to go work for Harper. In series 4, Sweetpea works under Harper at Mostyn Asset Management, but is opposed to Harper's impulsive trading strategy. Sweetpea's explicit photos have leaked online, hurting her job prospects and straining her relationship with her mother. After Harper exits Mostyn's firm and starts her own fund with Eric called SternTao, she brings an apprehensive Sweetpea on board, and the two investigate the shady dealings of payment processing startup Tender, which Harper seeks to short. Sweetpea's investigation leads her on a trip to Accra alongside SternTao trader Kwabena Bannerman to uncover the truth behind Tender's business. Sweetpea is assaulted during the trip by a man possibly sent by Tender, and she and Kwabena have sex.
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.
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.