shelf life 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.
Last reviewed on 2026-08-01. Where a claim depends on a specific study, the study is described rather than over-claimed.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It corresponds to the ACTH(4-7) fragment extended at the C-terminus by a Pro-Gly-Pro tripeptide, an addition intended to slow enzymatic breakdown. The molecular formula is C37H51N9O10S and the molecular mass is approximately 814 daltons. In the literature it is often described as an ACTH(4-10) analog, although that label reflects a naming convention as much as a precise structural relationship. The compound was developed in Russia and remains most closely associated with that research tradition.
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.
Identity and purity are confirmed with reversed-phase high-performance liquid chromatography, typically monitored at 214 nanometres where the peptide bond absorbs. Mass spectrometry, either electrospray or MALDI-TOF, verifies molecular mass against the theoretical value and detects truncation or adduct formation. Amino acid analysis and peptide mapping provide additional confirmation when required. The most frequently reported impurities are deletion sequences from incomplete coupling, methionine sulfoxide from oxidation, and dimeric species formed through non-covalent aggregation. Impurity profiles depend strongly on the synthesis and purification route chosen by the producer.
Published research has focused mainly on neurological and cognitive endpoints in animal models, with proposed mechanisms involving brain-derived neurotrophic factor and related signalling pathways. A substantial share of the human data originates from a limited number of research groups, and independent replication in other countries remains sparse. Regulatory status reflects that distribution: the peptide is registered as a medicine in Russia and appears in some neighbouring markets, while elsewhere it is handled as a research chemical without approved therapeutic labelling. Questions about dose-response relationships, long-term effects, and comparability across studies are still open.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C37H51N9O10S | Contains one methionine sulfur atom |
| Molecular mass | Approximately 814 Da | Consistent with a seven-residue peptide |
| Appearance | White to off-white powder | Typical lyophilized form |
| Solubility | Freely soluble in water | Also soluble in dimethyl sulfoxide |
| Typical storage | -20 °C, desiccated | Limits methionine oxidation |
各国监管态度分化明显。俄罗斯按处方药管理，部分东欧国家留有使用记录；欧盟与美国未批准其作为药物上市，市面流通品通常标注为研究用化学品。身份差异意味着标示含量、纯度与无菌性缺少统一核查。体育领域还牵涉反兴奋剂名录，跨境携带则受目的地药品法规约束。
Semax 是人工设计的七肽，序列为 Met-Glu-His-Phe-Pro-Gly-Pro，骨架取自促肾上腺皮质激素片段 ACTH(4-10)。它于二十世纪八十年代在苏联的分子遗传学研究机构内合成。设计目标是保留该片段与注意力和记忆相关的活性，同时剔除促皮质激素释放等内分泌作用。此后俄罗斯将其登记为药品并进入临床使用。
当时的短肽研究普遍关注能否穿越血脑屏障、在低剂量下产生中枢效应，Semax 属于这一路线。鼻内给药是其主要使用方式，俄语文献报道的适应症涵盖缺血性卒中、短暂性脑缺血发作、认知功能减退以及视神经病变。这些研究大多发表在当地期刊上，样本规模与终点设置同西方试验惯例存在差异，国际同行对其临床证据的强度看法不一。
Dissolution is normally performed in water, phosphate-buffered saline, or normal saline, since the peptide is freely soluble in aqueous media and is rarely handled with strong organic solvents. Solution pH should be kept near neutral, because extreme acidity or alkalinity accelerates backbone hydrolysis and encourages oxidation of the methionine side chain. Once dissolved, the material is less stable than the dry powder and is commonly divided into single-use portions and frozen. Buffers containing primary amines, such as Tris, are often avoided because of possible side reactions.
Purity assessment relies mainly on reversed-phase high-performance liquid chromatography, which separates the target heptapeptide from truncated sequences, deletion analogues, and oxidised forms. Mass spectrometry, usually coupled to liquid chromatography, confirms identity through the expected molecular ion and reveals modifications such as methionine sulfoxide formation. Amino acid analysis can verify composition, and tandem mass spectrometry supports sequence confirmation. Ultraviolet detection near 254 to 280 nanometres is convenient because the phenylalanine and histidine residues absorb in that region. Nuclear magnetic resonance is rarely used for routine release testing.
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.
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.
==== 1935–1949 ==== Teva Pharmaceutical Industries took its present form through the efforts of Günther Friedländer and his aunt Else Kober on May 1, 1935. The original registration was under the name Teva Middle East Pharmaceutical & Chemical Works Co. Ltd. in Jerusalem, then part of Mandatory Palestine. Friedländer was a German pharmacist, botanist and pharmacognosist, who immigrated to Mandatory Palestine in 1934. The company was built with an investment of £4,900, which came from the family's own capital and partly from loans from other German immigrants. Capital shortage led to the joining of the banker Alfred Feuchtwanger as a partner in Teva, who received 33% of the shares in return for his investment. Friedländer's business philosophy opined that the pharmaceutical industry has a reliable basis in difficult economic times, since "A Jewish mother will always buy medicine for her children". In the Second World War, the company provided medicine to the allied forces and in particular to the British army present in the Middle East. After the war, Sir Alan Gordon Cunningham, the last of the High Commissioners for Palestine and Transjordan, visited Teva on behalf of the Secretary of State for the Colonies. His visit promoted Teva's reputation in the pharmaceutical market and created a momentum for Teva's development. During Mandatory Palestine, Teva exported its medical products to Arab countries. In 1941, Friedländer presented Teva products in an exhibition held in Cairo, Egypt.
Grace is an American chemical business based in Columbia, Maryland. It produces specialty chemicals and specialty materials in two divisions: Performance Catalyst Solutions and Material Technologies. Performance Catalyst Solutions markets refining catalysts, polyethylene and polypropylene catalysts and related products and technologies used in petrochemical, refining, and other chemical manufacturing applications. Material Technologies makes specialty materials, including silica-based and silica-alumina-based materials, which are used in commercial products such as coatings and paints, consumer products such as toothpaste, and in chemical process applications, as well as Fine Chemical Manufacturing Services. For much of its early history, Grace's main business was in South America, in maritime shipping, railroads, agriculture, and silver mining, with 30,000 employees in Peru. In the 1950s, Grace began to diversify and grew into a Fortune 100 worldwide conglomerate. After emerging from a prolonged bankruptcy period of 12 years in 2014, the company spun off its other major operating divisions. In 2015, Grace separated into two independent public companies. Its Catalysts and Material Technologies business segments remained in Grace, and what would later become GCP Applied Technologies Inc. held its Grace Construction Products (GCP) and Darex Packaging Technologies businesses. In September 2021, Standard Industries acquired Grace (the Catalysts and Material Technologies business segments).
=== In adults === While there are some similarities between adults and children, OSA does not have the same consequences in both populations. Examples of similarities are the snoring – which is the most common complaint in both pediatric OSA and OSA in adults – variability of blood pressure and cardiovascular morbidities. A major difference is the excessive daytime sleepiness (EDS) which is commonly reported in adult OSA, while it is not very common in pediatric OSA. Nevertheless, OSA in adults also implies a large scope of adverse and serious consequences, the latter leading to higher mortality amongst OSA patients. Those consequences are even worsened by common morbidities such as obesity.
== Research == Soft-tissue sarcoma research requires significant effort due to its rarity; successful research requires substantial collaboration. Year by year, the medical field is learning that the various types cannot be lumped together and each sarcoma needs to be considered a different type of cancer. As a novel form of treatment used in other cancers, immunotherapy may have a role in treating soft-tissue sarcomas like alveolar soft part sarcoma and pleomorphic undifferentiated sarcoma. However, as of 2023, only alveolar soft part sarcoma has a regulatory approval for such an agent, in this case atezolizumab.
Sources: en.wikipedia.org
"Chordate". The Encyclopedia of Life. Chordate on GlobalTwitcher.com Chordate node at Tree Of Life Archived 24 February 2007 at the Wayback Machine Chordate node at NCBI Taxonomy Archived 28 April 2021 at the Wayback Machine
Within hours of the invasion, Kuwait and US delegations requested a meeting of the UN Security Council, which passed Resolution 660, condemning the invasion and demanding a withdrawal of Iraqi troops. On 3 August 1990, the Arab League passed a resolution, which called for a solution from within the league, and warned against outside intervention. Iraq and Libya were the only Arab League states that opposed the resolution for Iraq to withdraw; the Palestine Liberation Organization (PLO) opposed it as well. Yemen and Jordan – a Western ally which bordered Iraq and relied on the country for economic support – opposed military intervention from non-Arab states. Separately, Sudan, also an Arab League member, aligned itself with Saddam. On 6 August, Resolution 661 placed economic sanctions on Iraq. Resolution 665 followed soon after, which authorized a naval blockade to enforce the sanctions. It said the "use of measures commensurate to the specific circumstances as may be necessary ... to halt all inward and outward maritime shipping in order to inspect and verify their cargoes and destinations and to ensure strict implementation of resolution 661." The US administration had at first been indecisive with an "undertone ... of resignation to the invasion and even adaptation to it as a fait accompli" until the UK's prime minister Thatcher played a powerful role, reminding the President that appeasement in the 1930s had led to war, that Saddam would have the whole Gulf at his mercy along with 65% of the world's oil supply, and famously urging Bush "not to go wobbly".
Nobel Prize in Chemistry (2004). Member Natl. Acad. Sci. USA. Barry P. Rosen (b. 1944), American biochemist at Florida International University known for pioneering research into the molecular mechanisms of arsenic and antimony transport and detoxification. Sinaida Rosenthal (1932–1988). German biochemist and molecular biologist at the Humboldt University of Berlin who studied molecular biological and genetic aspects of physiology. William J. Rutter (1927–2025). American biochemist at the Chiron Corporation who contributed to the development of biotechnology.
An identical band was found doing the reverse order of the detection; meaning Myc antibody was immunoprecipitated then followed by blotting with the HA antibody. So, the method had proven to work that photo-Met could cross-link proteins, but the physiological implications of this cross-linking has yet to be determined.
Several critics complained about the required usage of the program Steam, the requirement to create an account, register the products, and permanently lock them to the account before being allowed to play, along with installation difficulties and lack of support.
Sources: en.wikipedia.org
=== Psychiatric disorders === Valproate products are used to treat manic or mixed episodes of bipolar disorder. A 2016 systematic review compared the efficacy of valproate as an add-on for people with schizophrenia:
The transition to democracy took place in the early years of his reign, making Spain no longer the only non-communist dictatorship left in Europe. The new king assumed the project of the reformist sector of Franco's political elite that, facing the conservatives, defended the need to introduce gradual changes in the fundamental laws so that the new monarchy would be accepted in Europe as a whole. This project was the one that his first government tried to implement, and it was presided by Carlos Arias Navarro, who had already headed the last government of General Franco. However, in view of the incapacity demonstrated by Arias Navarro, Juan Carlos appointed in July 1976 the Francoist "reformist" Adolfo Suárez as the new Head of Government to lead the process of transition to democracy without any "rupture" with the "previous regime". This is how the Political Reform Act came about, which was approved by the Francoist Cortes and revalidated in the referendum of December 1976. According to this new fundamental law, free elections to democratically elected Cortes were to be called. Suarez's problem was to get the "controlled" transition process established in the Political Reform Act accepted by the democratic opposition, since the latter, in exchange for abandoning the "democratic rupture" and participating in the elections, demanded that Franco's institutions be dismantled and that all parties without exception ─ including the Communist Party of Spain ─ be legalized.
== Research and career == Okan worked as a research fellow for one year at the Cleveland Clinic, USA. He studied wound care after laser resurfacing. He participated in the clinical and research activities of the Cleveland Clinic Florida Dermatology Department, published several clinical research articles and conducted clinical research projects. His research interest has focused on psoriasis, vitiligo, rosacea, laser and dermatologic signs of systemic diseases and wound healing. In April 2015, Okan published a popular book about dermatology, "Krem-Cilt Sağlığının ABC'si" ("Cream: The ABC's of Skin Care"). The book reflects day-to-day clinical experience and direct knowledge of cutting edge advances, advising people to choose cosmetic products carefully, and to maintain proper nutrition and hydration. He particularly advises parsley, nettle, chamomile, ginseng, thyme, melon, broccoli, and carrot, as well as Vitamin A, Vitamin B3, Vitamin C, Vitamin D, Vitamin K, Vitamin H, zinc and iron. In other media, Okan has also deemed a good-quality sunscreen to be the best defense against aging. Later in 2015, he participated in 23rd World Congress of Dermatology, in Vancouver. Okan is a European Board Certified dermatologist and passed the Specialty Certificate Examination (SCE) in Dermatology in the UK.
== Derivatives == DS54360155, a novel compound with a unique and original bicyclic skeleton, is more a potent analgesic than conolidine in mice. DS39201083 and DS34942424 are other similar derivatives. They all lack mu-opioid activity. The researchers who found conolidine binding site ACKR3/CKCR7 also developed a synthetic analogue of it called RTI-5152-12. It displays an even greater activity on that receptor.
4-HO-EPT, also known as 4-hydroxy-N-ethyl-N-propyltryptamine or as eprocin, is a psychedelic drug of the tryptamine family, which is structurally related to psilocin (4-HO-DMT). It was encountered as a novel designer drug in Japan by 2021.
Sources: en.wikipedia.org
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.
Most published work uses intranasal administration, matching the route of the registered Russian formulation. Some animal experiments use intravenous or intraperitoneal injection. The route matters because the intact peptide is cleared rapidly from blood, so exposure differs between methods.
A purity value describes the share of the powder accounted for by the target peptide, usually by high-performance liquid chromatography. It does not confirm that the sequence is correct, which requires mass spectrometry or amino acid analysis. Purity and identity are separate checks.
Reversed-phase HPLC gives the main purity figure, most often with UV detection near 214 nanometres. Mass spectrometry then confirms the molecular mass. Together the two methods distinguish a correct sequence from a closely related impurity.