The short version of Semax fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2025-10-31 and is reviewed periodically as new material appears.
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。
从分子层面看，Semax 是线性七肽，没有二硫键、糖基或脂链修饰，N 端为游离氨基，C 端为游离羧基。分子含组氨酸与谷氨酸侧链，因此在水和甲醇等极性溶剂中溶解良好，在非极性溶剂中溶解有限。计算分子量约为 814 Da，与其质子化离子的质荷比吻合，可用于质谱确认。
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。
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.
| Property | Value | Notes |
|---|---|---|
| 分子式 | C37H51N9O10S | 游离碱形式 |
| 等电点 | 约 6.5 | 估算值，随缓冲体系变化 |
| 主要降解途径 | 水解与氧化 | 侧链氧化最为常见 |
| 溶液储存 | 2 至 8 摄氏度避光 | 避免反复冻融 |
| 常规分析手段 | 反相色谱与质谱联用 | 氨基酸分析辅助核对 |
Identity and purity of Semax are established mainly by reversed-phase high-performance liquid chromatography coupled with mass spectrometry. The chromatographic trace gives a purity estimate as a percentage of total peak area, while electrospray or matrix-assisted laser desorption ionization confirms the molecular mass against the calculated value. Amino acid analysis and sequence-specific fragmentation provide further confirmation when a supplier's chain of custody is unclear. Vendors frequently quote a purity figure without stating the detection wavelength or the integration method, which limits how far one number can be compared with another.
Stability depends heavily on physical state. Lyophilized powder held dry, cold and dark retains its content over long periods, whereas dissolved peptide begins to change within days at room temperature. The most cited degradation route is oxidation of the methionine residue, which converts the peptide to a sulfoxide form that elutes differently on chromatography. Hydrolysis of amide bonds and adsorption onto container walls contribute smaller losses. Buffers that exclude oxygen from the headspace slow the oxidation pathway, but no single condition prevents all change indefinitely.
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.
Development of the compound took place in the Soviet Union during the 1980s, largely through peptide research groups affiliated with the Shemyakin-Ovchinnikov Institute and Moscow State University. Investigators screened fragments of adrenocorticotropic hormone for activity on the central nervous system while attempting to separate cognitive effects from hormonal ones. The shortened sequence was selected because it retained behavioral activity in animal models without stimulating corticosteroid release. Early publications described the molecule as an ACTH(4-10) analog.
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.
Lyophilized material is chemically stable for extended periods when kept dry, cold, and protected from light. The powder is hygroscopic, so vials should be warmed to room temperature before opening to reduce condensation on the contents. Once dissolved, the peptide is far less stable because peptide bonds are susceptible to hydrolysis and the methionine residue can oxidize. Solutions are typically aliquoted and held at 2-8 °C for short intervals or frozen for longer ones, and repeated freeze-thaw cycles should be avoided.
Routine characterization relies on reversed-phase high-performance liquid chromatography to establish purity and on mass spectrometry to confirm molecular identity. Electrospray ionization and matrix-assisted laser desorption ionization are both used for mass verification. Amino acid analysis and peptide mapping can detect sequence errors. Common impurities include truncated sequences, methionine sulfoxide formed by oxidation, and deamidated products. Chromatograms are usually recorded near 214 nm, where the peptide backbone absorbs, and purity is reported as the percentage area of the principal peak.
Russian regulatory authorities approved the peptide for nasal administration, and it remains listed in the national pharmacopoeia under several trade names. Documented indications include acute ischemic stroke, transient ischemic attacks, traumatic brain injury, and certain ophthalmological and neurological conditions. Physicians also prescribe it for cognitive complaints in older patients, although the evidence base for that use is thinner. Outside Russia and a few neighboring states, the substance is not an approved medicine and is sold instead as a research chemical.
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.
Platelets or thrombocytes (from Ancient Greek θρόμβος (thrómbos) 'clot' and κύτος (kútos) 'cell') are a part of blood whose function (along with the coagulation factors) is to react to bleeding from blood vessel injury by clumping to form a blood clot. Platelets have no cell nucleus; they are fragments of cytoplasm from megakaryocytes which reside in bone marrow or lung tissue, and then enter the circulation. Platelets are found only in mammals, whereas in other vertebrates (e.g. birds, amphibians), thrombocytes circulate as intact mononuclear cells.
== Disruption of traditional logistics and supply chain management == The shipping and logistics industry has long been viewed as conservative and slow-to-change, in part due to complex relationships within global shipping and transportation networks, difficult documentation and customs requirements, lack of transparency among involved parties, and obstacles to adapting quickly to sudden economic changes. Recent developments in freight technology are working to modernize and simplify freight transport. According to a report from the U.S. Department of Transportation, intelligent freight technologies have multifaceted benefits in shipping and logistics. These include increased operational flexibility and efficiency due to better planning and schedule adherence, better utilization of people and equipment, reduction of non-productive waiting times, shorter processing times, and increased shipper confidence. Transactional application programming interfaces (API) and distributed ledger technology are expanding in the shipping and logistics sector to reduce extensive paperwork, monitor conditions and location of freight and goods in transport and make this information available to involved parties, and increase transparency across the supply chain.
=== Other countries === The flag was used in the Gaza war protests, such as in London in November 2023 and in Italy in September–October 2025. The flag was flown by some protesters during the Trillion Peso March which was against corruption and the "ghost projects" controversy in the Philippines, During another protest in the Philippines on 12 October, a motorcycle rider carrying the flag was confronted by other protestors who suspected him of being a provocateur, and he was escorted away by police. and by university students protesting lifetime pensions for parliament members in East Timor. During the French anti-government Bloquons tout protests in September 2025 after the fall of the Bayrou government, some protesters carried the flag. The flag was present during the 2025 Peruvian protests, where the flag was once again used by demonstrators protesting against pension reforms in Peru by the government of Dina Boluarte. Specifically, the flag was present again during the protest on 24 September in Plaza San Martín, Lima. Anti-government protesters in Asunción, Paraguay, in late September along with protesters at La Paz demanding an audit for the 2025 Bolivian general election in October also carried the flag. Gen Z protesters in Morocco used the flag. British magazine The Week noted the flag's presence in protests in New York, Rome, and Slovakia.
== Duties == The multiple duties of a diener are typically the same wherever employed. One of the main duties is to assist in autopsies. One duty in assisting with autopsies includes positioning patients for them to be fingerprinted. Another task done as a part of assisting with autopsies involves the removal of organs, tissues, and any fluids (such as blood) from the body. Fingerprinting patients, removing tissues and organs, drawing and spinning blood samples are done as a part of collecting and preserving forensic evidence, which is a portion of the responsibilities for a diener. In autopsy assisting, a diener can collect and keep record of evidence relating to a patient’s death. Examples of collectible evidence includes any body tissues, slides, radiographs, and any on-scene evidence. A diener also performs tasks such as x-rays (body and dental) and developing and evaluating films from x-rays as a part of record keeping. The record keeping of evidence examined in an autopsy by a diener is used in the determination of the cause of death. In addition to evidence collection and record keeping, a diener has the task of explaining the process of an autopsy in entirety to other employees, law enforcement, and others interested, such as family members of the dead. A diener performs tasks such as checking inventory and placing orders for equipment and supplies regularly. In addition to performing inventory-related tasks, a diener will clean radiological and medical equipment, as well as inspecting equipment for any issues.
Sources: en.wikipedia.org
Rausing strove to improve the Tetra Classic system, beset with many technical problems during the 1950s, and spent enormous amounts on development. The different projects – the tetrahedron, the aseptic packaging technology, Tetra Brik – all demanded large resources, and the company had financial troubles well into the 1960s. Tetra Pak's commercial breakthrough did not arrive until the mid-1960s with the new Tetra Brik package, introduced in 1963, and the development of the aseptic technology. To liberate capital, Åkerlund & Rausing was sold in 1965 while AB Tetra Pak was retained. International expansion had begun in the 1960s, when the first production plant outside of Sweden was established in Mexico in 1960, soon to be followed by another in the United States in 1962. In 1964, the first Tetra Classic Aseptic machine outside of Europe was installed in Lebanon. The late-1960s and 1970s saw a global expansion of the company, mainly due to the new Tetra Brik Aseptic package, launched in 1969, which opened up new markets in the developing world and sparked an explosion in sales.
== Other use of sake kasu == Sake kasu can be found in different cosmetics and skincare products such as facial masks, bath powder, and face cream. There is an old folktale about an elderly man who worked in a brewery with youthful-looking hands compare to his old wrinkled face; in light of this, different cosmetics companies use sake kasu as an ingredient and a selling point for their product. A research scientist found an old sake brewer who had no wrinkles on his hands due to the constant contact with the yeast produced during the sake fermentation process. Other research focused on the yeast produced during the sake fermentation process leading to a product line called Pitera. Sake kasu can also be used as the main ingredient for homemade beauty products including sake kasu facial masks and body masks. Adding citrus fruit juice, honey, and rice water, aloe vera or rose water to sake kasu can create a mask for both face and body. It brightens the users' skin and the antioxidants in the mask can stimulate collagen production. Because sake kasu contains alcohol, it is recommended that sunscreen be applied before using the homemade sake kasu mask. Sake kasu can be beneficial for cosmetic use due to the high amount of triacylglycerols found in freeze-dried sake kazu. Tyrosinase catalytic activity is hindered by the n-hexane extract from freeze-dried sake kasu. Tyrosinase inhibitor was further purified by the n-hexane extract from the freeze-dried sake kasu.
Wagyu (Japanese: 和牛, Hepburn: wagyū, lit. 'Japanese cattle') is not the name of a single cattle breed. Today, the term usually refers to four established Japanese breeds of beef cattle: the Japanese Black, Japanese Brown, Japanese Polled, and Japanese Shorthorn. Historically, it was also used for native Japanese cattle; the surviving Mishima and Kuchinoshima cattle populations are not included among the four modern breeds. Beginning in the late nineteenth century, these breeds were developed from regional native cattle crossed with imported stock. The timing of crossbreeding and the imported breeds involved varied by breed and region. The resulting cattle were later established as distinct breeds through selection and closed breeding. The Japanese Black accounts for more than 90% of Wagyu cattle raised in Japan and is the main source of the highly marbled beef commonly associated with Wagyu. Its beef has finely distributed intramuscular fat known as sashi, a high proportion of monounsaturated fatty acids, and a distinctive sweet aroma that develops during cooking. The other three breeds generally produce less heavily marbled beef. Regional names such as Kobe beef, Matsusaka beef, Ōmi beef, and Yonezawa beef refer to brands defined by geographical origin and production or quality standards, not to additional cattle breeds. In Japan, beef carcasses are graded separately for meat yield and meat quality.
Sources: en.wikipedia.org
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。
甲硫氨酸侧链含硫醚，在氧气、光照或金属离子存在时容易被氧化。氧化产物极性略增，常在色谱图上表现为主峰之前的肩峰或前伸峰。
通常建议冷藏避光，并在较短时间内使用。不存在适用于所有配方的统一期限，具体取决于浓度、缓冲体系与容器材质。
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.