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 2026-01-13. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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 compound was developed during the 1980s at the Institute of Molecular Genetics in Moscow as part of research on fragments of adrenocorticotropic hormone. Early work examined short ACTH-derived sequences that retained neurotrophic effects while lacking the endocrine activity of the full hormone. Semax entered clinical use in Russia during the 1990s, where it received registration for several neurological indications. Outside that region it remained primarily a laboratory research material rather than an approved therapeutic. English-language literature on it grew more slowly and frequently cited the original Russian studies.
| 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 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.
The 70 kilodalton heat shock proteins (Hsp70s or DnaK) are a family of conserved ubiquitously expressed heat shock proteins. Proteins with similar structure exist in virtually all living organisms and play crucial roles in the development of cancer, neurodegeneration, apoptosis, regulating sleep, and much more. Intracellularly localized Hsp70s are an important part of the cell's machinery for protein folding, performing chaperoning functions, and helping to protect cells from the adverse effects of physiological stresses. Additionally, membrane-bound Hsp70s have been identified as a potential target for cancer therapies and their extracellularly localized counterparts have been identified as having both membrane-bound and membrane-free structures. There is lot of potential in the Hsp70 protein as a key therapeutic target for developing new drugs for the treatment of sleep disorders, cancer, neurodegeneration, and other related pathological conditions.
(2026) study the morphology of hominin limb bones from the Salawusu site (China), finding no evidence of diagnostic features of the Neanderthal lineage, and reporting morphological evidence consistent with affinities with modern humans. Li et al. (2026) report evidence from the study of the palynological record from the East China Sea continental shelf spanning the past 71,000 years indicative of presence of a cool, dry temperate grassland biome during the lowstand intervals (including the Last Glacial Maximum), as well as evidence of presence of an open-forest landscape during the milder conditions of the Marine Isotope Stage 3, and interpret their findings as supporting the interpretation of the exposed East China Sea continental shelf as a habitat facilitating the initial dispersal of early modern humans into East Asia. Zhang et al. (2026) study the features of stone tools from the Nwya Devu site (China), reporting evidence of differences from stone tool assemblages from northern Initial Upper Paleolithic sites, and interpret tools from the Nwya Devu site as either representing a regional variant of Initial Upper Paleolithic technology or resulting from a separate dispersal of blade technologies into East Asia. Totsuka et al. (2026) reconstruct the chronology of early Upper Paleolithic sites in Japan, and report evidence of rapid increase in the number of sites between 36,000 and 34,000 years ago that was likely linked to growth of the human population size. Oktaviana et al.
Notable is the mention of cystoceles in many older cultures and locations. In 1500 B.C. Egyptians wrote about the "falling of the womb". In 400 B.C., a Greek physician documented his observations and treatments: "After the patient had been tied to a ladder-like frame, she was tipped upward so that her head was toward the bottom of the frame. The frame was then moved upward and downward more or less rapidly for approximately 3–5 min. As the patient was in an inverted position, it was thought that the prolapsing organs of the genital tract would be returned to their normal position by the force of gravity and the shaking motion." Hippocrates thought that recent childbirth, wet feet, 'sexual excesses', exertion, and fatigue may have contributed to prolapse. Polybus, Hippocrates's son-in-law, wrote: "a prolapsed uterus was treated by using local astringent lotions, a natural sponge packed into the vagina, or placement of half a pomegranate in the vagina." In 350 A.D., another practitioner named Soranus described his treatments, which stated that the pomegranate should be dipped into vinegar before insertion. Success could be enhanced if the woman were on bed rest and had reduced food and fluid intake. If the treatment was still not successful, the woman's legs were tied together for three days. In 1521, Berengario da Carpi performed the first surgical treatment for prolapse. This was to tie a rope around the prolapse, tighten it for two days until it was no longer viable, and cut it off. Wine, aloe, and honey were then applied to the stump.
==== Blends of liquids ==== As for pure liquids, the viscosity of a blend of liquids is difficult to predict from molecular principles. One method is to extend the molecular "cage" theory presented above for a pure liquid. This can be done with varying levels of sophistication. One expression resulting from such an analysis is the Lederer–Roegiers equation for a binary mixture:
Thomson (1937), Roman Catholic priest, professor at Providence College Thomas Merton (1938), Trappist monk, writer, humanist; author of The Seven Storey Mountain Robert Farrar Capon (1946), Episcopal priest and author Wesley Frensdorff (1948), former Episcopal bishop of Nevada Haskel Lookstein (1953), Modern Orthodox Rabbi; spiritual leader of Congregation Kehilath Jeshurun and principal of Ramaz School since 1966 Harold Kushner (1955), rabbi and writer Adi Da (1961), born Franklin Albert Jones, spiritual teacher; founder of a new religious movement, Adidam Michael Lerner (1964), liberal rabbi and editor of Tikkun magazine Elliot N. Dorff (1965), conservative rabbi, chairman of the Rabbinical Assembly's Committee on Jewish Law and Standards Joseph Goldstein (1965), vipassana expert Alan Senauke (1969), Soto Zen priest, folk musician, and poet residing at the Berkeley Zen Center; former director of the Buddhist Peace Fellowship Taigen Dan Leighton (1971), Soto Zen priest and teacher, academic at the Institute of Buddhist Studies C. John McCloskey (1975), Catholic priest who helped prominent figures convert to Catholicism, including Newt Gingrich, Bernard Nathanson, Sam Brownback, and Lawrence Kudlow Haviva Ner-David (1991), Israeli feminist activist and rabbi Sharon Brous (1995), first woman to be named most influential rabbi by Newsweek
Sources: en.wikipedia.org
The strength and direction of these fields are the same regardless of the size of a wound. Healing of skin wounds is a complex process involving the cooperation of various elements of the body, such as platelets, immune cells, epithelial cells, and fibroblasts. This process is coordinated largely by chemical signals, but there is evidence that electrotaxis plays an additional role in directing specific cell types toward the site of an injury. During the proliferation phase of recovery, keratinocytes move toward the cathodal side of the EFs occurring around and injury, bringing them toward the edge of the wound. In fact, in vitro experimentation found that application of physiological strength EFs could override other signals and guide cells to migrate towards or even away from a wound depending on the direction of the field, regardless of chemical factors. EFs have also experimentally been found to influence cell migration in human umbilical vein cells, dermal fibroblasts, and myofibroblasts.
=== Shelby's Legendary Shawarma === Shelby's Legendary Shawarma is a shawarma fast food chain that has 42 locations, primarily in Ontario owned by Shelby's Franchise Holdings, Inc. headquartered in Oakville, Ontario. It was founded in 2015 when two Arab men from London, Ontario, Yazan El-Shalabi and Yasser Ali (also known by his public persona of "Shawarma Man") opened a food truck replacing a food trailer in nearby Lambeth originally catering to University of Western Ontario students. After opening its permanent brick-and-mortar location in 2018, Shelby's now operates over 40 locations across Ontario located in the Greater Toronto Area, Ottawa, and southwestern Ontario with plans to expand outside of Ontario, particularly in Western Canada, and internationally, in the United States and United Kingdom in the future. This restaurant serves shawarma wraps, rice bowls, poutines, maneesh and churros. It has a social media presence on YouTube, TikTok, Instagram, X (Twitter) and Facebook.
In a water molecule, the hydrogen atoms form a 104.5° angle with the oxygen atom. The hydrogen atoms are close to two corners of a tetrahedron centered on the oxygen. At the other two corners are lone pairs of valence electrons that do not participate in the bonding. In a perfect tetrahedron, the atoms would form a 109.5° angle, but the repulsion between the lone pairs is greater than the repulsion between the hydrogen atoms. The O–H bond length is about 0.096 nm. Other substances have a tetrahedral molecular structure, for example methane (CH4) and hydrogen sulfide (H2S). However, oxygen is more electronegative than most other elements, so the oxygen atom has a negative partial charge while the hydrogen atoms are partially positively charged. Along with the bent structure, this gives the molecule an electrical dipole moment and it is classified as a polar molecule. Water is a good polar solvent, dissolving many salts and hydrophilic organic molecules such as sugars and simple alcohols such as ethanol. Water also dissolves many gases, such as oxygen and carbon dioxide – the latter giving the fizz of carbonated beverages, sparkling wines and beers. In addition, many substances in living organisms, such as proteins, DNA and polysaccharides, are dissolved in water. The interactions between water and the subunits of these biomacromolecules shape protein folding, DNA base pairing, and other phenomena crucial to life (hydrophobic effect). Many organic substances (such as fats and oils and alkanes) are hydrophobic, that is, insoluble in water.
== External links == Diabetes in America, 2nd Edition (textbook) (PDFs) Archived 25 April 2011 at the Wayback Machine – National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) IDF Diabetes Atlas Type 1 Diabetes Archived 30 October 2009 at the Wayback Machine at the American Diabetes Association ADA's Standards of Medical Care in Diabetes 2019
Sources: en.wikipedia.org
=== Microbead-based immobilization === Microbead-based immobilization is a modular technique in that it allows the investigator to decide whether they wish to fish for protein targets from the proteome or drug-like compounds from chemical libraries. The macroscopic properties of microbeads make them amenable to relatively low labor enrichment applications, since they are easily to visualize and their bulk mass is readily removable protein solutions. Microbeads were historically made of inert polymers, such as agarose and dextran, that are functionalized to attach a bait of choice. In the case of using proteins as bait, amine functional groups are common linkers to facilitate attachment. More modern approaches have benefitted from the popularization of dynabeads, a type of magnetic microbead, which enable magnetic separation of bead-immobilized analytes from treated samples. Magnetic beads exhibit superparamagnetic properties, which make them very easy to remove from solution using an external magnet. In a simplified workflow, magnetic beads are used to immobilize a protein target, then the beads are mixed with a chemical library to screen for potential ligands. High-affinity ligands bind to the immobilized target and resist removal by washing, so they are enriched in the sample. Conversely, a ligand of interest can be immobilized and screened against proteome proteins by incubation with a lysate.
To treat complications, medications can be prescribed including midodrine for autonomic neuropathy, amiodarone for patients with atrial fibrillation to prevent arrhythmias, and warfarin used after a cardioembolic episode. Familial (ATTRm-CM) Treatment: In recent years there have been developments in the treatment of Familial/Transthyretin cardiac amyloidosis including methods to suppress transthyretin production, stabilize amyloid fibrils, and medications that can destroy already existing fibrils. For familial amyloidosis, ACE-inhibitors and beta-blockers can be prescribed if there is no autonomic neuropathy.
Most merchandise is already packaged when it arrives at the supermarket. Packages are placed on shelves, arranged in aisles and sections according to type of item. Some items, such as fresh produce, are stored in bins. Those requiring an intact cold chain are in temperature-controlled display cases. While branding and store advertising will differ from company to company, the layout of a supermarket remains virtually unchanged. Although big companies spend time giving consumers a pleasant shopping experience, the design of a supermarket is directly connected to the in-store marketing that supermarkets must conduct to get shoppers to spend more money while there. Every aspect of the store is mapped out and attention is paid to color, wording and surface texture. The overall layout of a supermarket is a visual merchandising project that plays a major role. Stores can creatively use a layout to alter customers' perceptions of the atmosphere. Alternatively, they can enhance the store's atmospherics through visual communications (signs and graphics), lighting, colors, and scents. For example, to give a sense of the supermarket being healthy, fresh produce is deliberately located at the front of the store. In terms of bakery items, supermarkets usually dedicate 30 to 40 feet of store space to the bread aisle. Supermarkets are designed to "give each product section a sense of individual difference and this is evident in the design of what is called the anchor departments; fresh produce, dairy, delicatessen, meat and the bakery".
=== Czech Republic === After joining NATO, the Army of the Czech Republic developed a combat ration known as the BDP (Czech: Bojová Dávka Potravin). The BDP comes in two versions, type I and II, each holding two ready-to-eat main courses packed in large foil "cans" (beef roast with rice, pork goulash with potato, spicy risotto, pork with carrots and vegetables, etc.), a small plastic cup of lunch meat spread, cheese spread, hard bread, cookies, jam, instant coffee, tea bags, fruit-flavored multivitamin drink tablets, vitamin C enriched fruit drink powder, a chocolate bar, sugar, salt, chewing gum, wet napkins, paper towels, a plastic bag, and a menu and instruction sheet. A modified version of the BDP known as the KDP (Czech: Konzervovaná Dávka Potravin) is also used. This contains the same items as the BDP, but adds an aluminium cup, plastic utensils, a folding stove with fuel tablets and matches, and soap.
Health can play a central role in how people live their lives, reflecting the overall condition in which an organism functions properly, both physically and mentally. Good physical health is associated with high energy and the ability to perform everyday activities. Physical illnesses and disabilities can negatively impact well-being by causing pain, limiting mobility, and reducing the capacity to engage in enjoyable or necessary activities. Good mental health is a state of internal equilibrium in which mental capacities function as they should. Mental disorders are associated with some form of psychological impairment: they typically disrupt the equilibrium by causing distress and may limit the activities a person can engage in. Discrimination can amplify the negative effects of socially stigmatized illnesses and disabilities. Despite its general impact, health does not fully determine happiness, and some individuals affected by severe illnesses and disabilities report high levels of subjective well-being. The availability of healthcare services can mitigate negative effects by providing treatments to restore health or manage and alleviate symptoms. Similarly, adopting a healthy lifestyle, like regular physical activity and a balanced diet, is associated with long-term benefits to well-being.
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 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.