synthetic heptapeptide raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2025-08-21. Anything still debated is marked as such rather than presented as settled.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. Its chain combines the first seven residues of corticotropin with a C-terminal proline-glycine-proline extension, a modification intended to slow enzymatic breakdown. The free peptide has a molecular mass near 813.9 daltons. It belongs to the class of ACTH-derived fragments studied for central nervous system activity rather than for adrenal steroid stimulation. This structural relationship to a natural hormone fragment is the usual starting point for describing the compound in the literature.
Development took place during the 1980s at institutes of the Russian Academy of Sciences, where peptide fragments of ACTH were screened for cognitive and neuroprotective effects. The compound received regulatory approval in Russia as a nasal preparation, marketed for conditions such as ischemic stroke, transient ischemic attacks, and optic nerve disorders. Registration in other countries has not followed. Most published clinical reports originate from a small number of Russian research groups, and independent replication outside that setting remains limited. The regulatory status therefore differs sharply between Russia and the rest of the world.
稳定性主要由水解与氧化两条路径支配。肽键在中性或弱酸性条件下相对稳定，遇到强碱或长时间高温则明显断裂；甲硫氨酸侧链容易被氧化成亚砜，使主峰前移并拉低实际含量。金属离子、光照和反复冻融会进一步促进降解或聚集。冻干粉在低温避光条件下可存放较长时间，配制后的水溶液通常需要冷藏并尽快用完。
纯度评估以反相高效液相色谱为主，通过主峰面积百分比给出粗略结果，再配合电喷雾质谱核对分子量。氨基酸分析可验证组成比例，手性色谱或毛细管电泳用于检查残基构型。常见杂质包括缺失序列的短肽、氧化产物与二聚体。由于多数市售品不附带完整检验报告，独立第三方检测常被用来核实标称值。
| Property | Value | Notes |
|---|---|---|
| Sequence | Met-Glu-His-Phe-Pro-Gly-Pro | Heptapeptide; ACTH(4-10) analog extended at C-terminus |
| Molecular mass | ~813.9 Da | Free peptide, unmodified |
| Appearance | White to off-white powder | Typical lyophilized solid |
| Solubility | Soluble in water and saline | Also soluble in common aqueous buffers |
| Storage (solid) | -20 °C, desiccated | Protect from moisture and repeated thawing |
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.
溶液状态的稳定性明显低于冻干粉。肽类在水溶液中可能经历水解、氧化与聚集，其中甲硫氨酸和天冬酰胺等残基常是敏感位点。Semax 含有甲硫氨酸，因此氧化风险相对突出。工作液一般主张现配现用，或冷藏并在数日内用尽。缓冲液种类、pH 和离子强度都会影响降解速率，而关于最佳条件的公开数据并不统一。
常规纯度与身份确认依赖反相高效液相色谱，并辅以质谱测定分子量。氨基酸组成分析可用于验证序列构成，肽图分析则能进一步定位修饰或降解产物。杂质谱通常关注缺失序列肽、截短片段和氧化产物。不同方法的检出限并不相同，因此各实验室报告的纯度数值不宜直接横向比较。
Published research on this peptide originates mainly from Russian laboratories, and the wider international literature is comparatively thin. Studies have used rodent models of stroke, hypoxia, and memory tasks, with a smaller number of human trials reported. Reported outcomes include changes in attention and memory measures, along with effects on neurotrophic factor expression in some experiments. Small sample sizes, inconsistent dosing protocols, and limited independent replication are widely noted limitations, so the strength of the clinical evidence remains an open question.
Semax is a synthetic heptapeptide whose sequence is Met-Glu-His-Phe-Pro-Gly-Pro. The first four residues correspond to the ACTH(4-10) fragment, while the terminal Pro-Gly-Pro extension was added to improve metabolic stability. Its molecular formula is C37H51N9O10S and its monoisotopic mass is approximately 813.9 Da. The compound is classified as a peptide research chemical and as a registered pharmaceutical product in Russia, but it does not hold marketing approval in the European Union or the United States. Naming conventions vary across supplier catalogs.
Common degradation pathways include oxidation of the methionine side chain, hydrolysis of the peptide backbone, and aggregation under unfavourable pH or concentration. Stability studies typically monitor the main peak by chromatography and report total related substances as a percentage. Because no official monograph exists, acceptance criteria vary between laboratories, and reported purity values are not directly comparable across suppliers. Analysts therefore document the method, column, and detection wavelength alongside each result, and open questions remain about how much biological activity the oxidised forms retain.
Solid semax is typically supplied as a lyophilised powder that is hygroscopic and sensitive to moisture, light, and repeated temperature cycling. Long-term storage of the dry peptide is generally recommended at approximately -20 degrees Celsius, while shorter working periods may use refrigeration at 2 to 8 degrees Celsius. Vials should remain tightly closed and desiccated when brought to room temperature, because condensation can damage the material before it is weighed. Dividing a batch into aliquots is preferable to thawing one container repeatedly.
The Neanderthal skull has a flat and broad skullcap, rounded supraorbital torus (the buldge that forms the brow ridges), larger, wide orbits (eye sockets), a broad nose, mid-facial prognathism (the face projects far from the base of the skull), an "en bombe" (bomb-like) skull shape when viewed from the back, a fossa (depression) on the back of the skull below the level of the inion (suprainiac fossa), and an occipital bun (bony projection) at the back of the skull. Like those of other archaic humans, their jaws lack a true chin. The Neanderthal braincase averages 1,640 cm3 (100 cu in) for males and 1,460 cm3 (89 cu in) for females, which is significantly larger than the averages for all 147 homonids studied. The largest Neanderthal brain, Amud 1, was calculated to be 1,736 cm3 (105.9 cu in), one of the largest ever recorded in humans. Neanderthal brain organisation differs in areas related to cognition and language, which may be implicated in the comparative simplicity of Neanderthal behaviour to Cro-Magnons in the archaeological record. Neanderthals had large and wide noses, probably an adaptation to warm greater quantities of cold air to fuel their assumed heightened metabolism and activity levels. A large nose does not necessarily equate to a better sense of smell, and neurologically, because the olfactory bulbs are smaller, Neanderthals may have had a poorer sense of smell and olfactory memory than modern humans.
=== Euphemisms === A huge variety of euphemisms and dysphemisms have been invented to describe semen (for a list of terms see: Sexual slang). Slang terms for semen include cum, jism (also shortened to jizz), spunk (primarily British English), spooge, splooge, load, nut, seed, and love juice. The term cum can also refer to an orgasm (when used as a verb rather than as a noun). The term nut originally referred to a testicle, but can be used to refer to both semen and ejaculation.
== Other animals == Other animals, including pigs. are susceptible to malignant hyperthermia. In dogs its inheritance is autosomal dominant. The syndrome has been reported in Pointers, Greyhounds, Labrador Retrievers, Saint Bernards, Springer Spaniels, Bichon Frises, Golden Retrievers, and Border Collies. In pigs its inheritance is autosomal recessive. In horses its inheritance is autosomal dominant, and most associated with the American Quarter Horse although it can occur in other breeds.
== Release == The series was presented as a non-competitive screening in the official selection of the 71st San Sebastián International Film Festival on 29 September 2023. It debuted on Movistar Plus+ on 11 October 2023. The original broadcasting run ended on 16 November 2023, with the release of episode 7. HBO LatAm and Movistar Plus+ International agreed on a deal for the distribution of the series in Latin American territories. The series was selected to have its international premiere in a showcase at the 2024 Sundance Film Festival. Arte acquired rights for France and Germany as well as other European countries such as Switzerland, Austria, Belgium, Andorra, Monaco, and Luxembourg. Starting on 1 April 2026, Hulu and Disney+ released the series in the United States. Mubi programmed a streaming release in the United Kingdom, Canada, Turkey, the Netherlands, Germany, Austria, and Australia for 3 September 2026. At the September 2026 Iberseries & Platino Industria market, Mubi was announced to have acquired worldwide rights to the series.
Sources: en.wikipedia.org
=== E-liquid === The mixture used in vapor products such as e-cigarettes is called e-liquid. E-liquid formulations vary widely. A typical e-liquid contains propylene glycol and glycerin (95%) with a combination of flavorings, nicotine, and other additives (5%). The flavorings may be natural, artificial, or organic. When e-liquids are heated, by-products such as formaldehyde, acetaldehyde, and acrolein can form, at levels that depend on operating conditions and liquid composition. There are many e-liquid makers and more than 15,000 flavors. The e-liquid usually contains nicotine from tobacco, but some products use non-tobacco nicotine, including synthetic lab-made nicotine. Many e-liquids use nicotine salts made by adding organic acids such as benzoic acid to nicotine, so as to reduce throat irritation. Some e-liquids also contain synthetic cooling agents. Many countries regulate what e-liquids can contain. In the US, there are Food and Drug Administration (FDA) compulsory manufacturing standards and American E-liquid Manufacturing Standards Association (AEMSA) recommended manufacturing standards. European Union standards are published in the EU Tobacco Products Directive.
Penis or pizzle is a type of offal. In many cultures, it is a taboo food. Penis is eaten in some cultures or traditional medicine systems as a purported health food: it may be seen as an aphrodisiac, a cure for sexual dysfunction, a hangover cure, and more. Penis is often paired with testicles as food.
== Etymology == Technology is a term dating back to the early 17th century that meant 'systematic treatment' (from Greek Τεχνολογία, from the Greek: τέχνη, romanized: tékhnē, lit. 'craft, art' and -λογία (-logíā), 'study, knowledge'). It is predated in use by the Ancient Greek word τέχνη (tékhnē), used to mean 'knowledge of how to make things', which encompassed activities like architecture. Starting in the 19th century, continental Europeans started using the terms Technik (German) or technique (French) to refer to a 'way of doing', which included all technical arts, such as dancing, navigation, or printing, whether or not they required tools or instruments. At the time, Technologie (German and French) referred either to the academic discipline studying the "methods of arts and crafts", or to the political discipline "intended to legislate on the functions of the arts and crafts". The distinction between Technik and Technologie is absent in English, and so both were translated as technology. The term was previously uncommon in English and mostly referred to the academic discipline, as in the Massachusetts Institute of Technology. In the 20th century, as a result of scientific progress and the Second Industrial Revolution, technology stopped being considered a distinct academic discipline and took on the meaning: the systematic use of knowledge to practical ends.
Thus, in all the villages inhabited by the Druze and Christians in central Mount Lebanon, a Christian church or Druze maqam is dedicated to either the Prophet Elijah or Saint George. The Druze environment influenced Christians living among them, and they started to use the same word for their churches, calling them maqām instead of kanīsah. Nour Fara Haddad, a scholar of religious anthropology, states that Christian pilgrimage sites associated with revered figures among Christians, Druze, and Muslims—such as shrines dedicated to the Virgin Mary, Saint George, or the Prophet Elijah—served as pilgrimage destinations for Christians, Muslims, and Druze alike. Even during conflicts, such as the civil conflict in 1860, these Christian shrines remained places where people from different religious backgrounds could meet and interact.
Hemostasis occurs when blood is present outside of the body or blood vessels. It is the innate response for the body to stop bleeding and loss of blood. During hemostasis three steps occur in a rapid sequence. Vascular spasm is the first response as the blood vessels constrict to allow less blood to be lost. In the second step, platelet plug formation, platelets stick together to form a temporary seal to cover the break in the vessel wall. The third and last step is called coagulation or blood clotting. Coagulation reinforces the platelet plug with fibrin threads that act as a "molecular glue". Platelets are a large factor in the hemostatic process. They allow for the creation of the "platelet plug" that forms almost directly after a blood vessel has been ruptured. Within seconds of a blood vessel's epithelial wall being disrupted, platelets begin to adhere to the sub-endothelium surface. It takes approximately sixty seconds until the first fibrin strands begin to intersperse among the wound. After several minutes the platelet plug is completely formed by fibrin. Hemostasis is maintained in the body via three mechanisms:
Sources: en.wikipedia.org
Saeujeot (새우젓) or myeolchijeot is not added to the kimchi spice-seasoning mixture, but is simmered first to reduce odors, eliminate tannic flavor and fats, and then is mixed with a thickener made of rice or wheat starch (풀). This technique has been falling into disuse in the past 40 years.
Many computational methods have been suggested and reviewed for predicting protein–protein interactions. Prediction approaches can be grouped into categories based on predictive evidence: protein sequence, comparative genomics, protein domains, protein tertiary structure, and interaction network topology. The construction of a positive set (known interacting protein pairs) and a negative set (non-interacting protein pairs) is needed for the development of a computational prediction model. Prediction models using machine learning techniques can be broadly classified into two main groups: supervised and unsupervised, based on the labeling of input variables according to the expected outcome. In 2005, integral membrane proteins of Saccharomyces cerevisiae were analyzed using the mating-based ubiquitin system (mbSUS). The system detects membrane proteins interactions with extracellular signaling proteins Of the 705 integral membrane proteins 1,985 different interactions were traced that involved 536 proteins. To sort and classify interactions a support vector machine was used to define high medium and low confidence interactions. The split-ubiquitin membrane yeast two-hybrid system uses transcriptional reporters to identify yeast transformants that encode pairs of interacting proteins. In 2006, random forest, an example of a supervised technique, was found to be the most-effective machine learning method for protein interaction prediction.
=== United Kingdom === The a2 Milk Company formed a joint venture with a major British milk supplier, Müller Wiseman Dairies (MWD), in November 2011 to process, market and sell its A1 protein-free products in Britain and Ireland. In June 2014 The a2 Milk Company reported it had 20 dedicated farms supplying milk for processing in the UK. In its first year the milk recorded £1 million in sales through 1,000 stores. On 1 January 2014, The a2 Milk Company exited its joint venture with MWD by acquiring MWD's stake for a "nominal" amount. In October 2019, the a2 Milk Company announced that it had decided to "discontinue a2 milk in the UK" and its products would only be available until the end of November 2019.
== Business units and subsidiaries == Medtronic has four main business units: the Minimally Invasive Therapies Group, the Diabetes Group, the Restorative Therapies Group, and the Cardiac and Vascular Group. Medtronic develops and manufactures devices and therapies to treat more than 30 chronic diseases, including heart failure, Parkinson disease, urinary incontinence, Down syndrome, obesity, chronic pain, spinal disorders and diabetes.
Sources: en.wikipedia.org
Semax is a synthetic seven-amino-acid peptide derived from a fragment of corticotropin. It is used in Russia as a nasal preparation, while elsewhere it is studied as a research compound. It is not approved as a medicine in most countries.
Its sequence corresponds to the 4-10 region of corticotropin extended by three residues. This fragment lacks the region responsible for adrenal steroid release, so it is explored for neural rather than hormonal effects. The relationship explains the compound's classification among ACTH-derived peptides.
It holds approval in Russia for several neurological indications as a nasal spray or drop formulation. Regulatory agencies in the United States and the European Union have not approved it. Products sold elsewhere are generally labeled for research use only.
电喷雾或基质辅助激光解吸电离质谱是常用手段，测得的质子化离子质荷比可换算为分子量。结果与理论值落在合理误差内，才支持结构一致的判断。