ACTH 片段 is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2026-08-01. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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.
Verification of a supplied batch generally combines a certificate of analysis with independent testing, because certificates are self-reported documents. A typical package includes a chromatographic trace, a mass spectrum, and a stated water or counter-ion content. Batch-to-batch consistency matters more than a single purity figure when results are compared across experiments. No single mandatory standard governs research-grade peptide release, so laboratories are expected to define their own acceptance criteria. Residual trifluoroacetate from purification is a frequently overlooked counter-ion.
| 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 |
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。
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。
多数实验室与市售的 Semax 以冻干粉形式提供。冻干粉通常建议保存在 -20 °C 或更低温度下，同时避免光照与反复升温。短期运输有时采用冷藏条件，但长期保存仍以冷冻为主。分包操作应尽量减少开盖次数，以降低吸湿和微生物污染的风险。开封后若未一次用完，建议在干燥环境中密封并尽快放回低温储存。
The parent fragment ACTH(4-10) carries the sequence Met-Glu-His-Phe-Arg-Trp-Gly. Semax replaces the arginine and tryptophan positions with a proline-glycine-proline tail, giving Met-Glu-His-Phe-Pro-Gly-Pro. That change removes residues associated with adrenal stimulation, so the peptide does not drive cortisol release the way full ACTH does. This distinction shapes how the compound is grouped in the literature, where it sits with neuropeptides and peptide neuromodulators rather than with corticosteroids.
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.
Four dead bodies were also recovered from Bannu whereas two people were injured in a drone and a bridge was destroyed by insurgentsin Miryan Tehsil of Bannu. An MBIED attack took place in Quetta with no casualties. TTP killed an FC soldier in Wara Mamund while another soldier was killed and several injured in a TTP attack on a military camp in Shakai area of South Waziristan. An insurgent vehicle was destroyed by a drone strike in Wana Tehsil. TTP issued warnings to the public, Police and tribal elders in Tank District in a video message warning against participation in military operations and also destroyed the Outar police checkpost there with explosives. On 18 July, a premature IED detonation led to the death of five TTP militants in the Nakhtar area of Wara Mamund Tehsil while another was killed in Wana Tehsil in a foiled VBIED attack. A TTP attack on Khazina Banda post in Hangu District wounded an Elite Force Personnel. CTD conducted an operation in Koraai area of Dera Ismail Khan District killing a TTP militant. On 19 July, heavy skirmishes took place between Afghan and Pakistani forces in Kurram District following an attack on Pakistani positions by the Taliban, Pakistani forces then launched a counteroffensive forcing Taliban to abandon multiple posts at the border. An FC soldier was killed in an IMP sniper attack on Tor Chapar post in Tirah while several civilians were injured in a drone strike in Dabori Ganda Mela area of Tirah.
Lula's administration has also sought to restore Brazil's international role and expand its participation in multilateral diplomacy, while placing greater emphasis on environmental policy and efforts to combat deforestation. Brazil hosted the 2025 United Nations Climate Change Conference (COP30) in Belém. The government's foreign policy was also affected by international tensions and economic disputes, including the Brazil–United States diplomatic crisis of 2025–2026. The administration has been marked by political controversies and debates over the regulation of digital platforms, disinformation, freedom of expression, and the protection of children online. Domestically, the government has faced challenges in its relationship with Congress and debates over public spending and economic policy. Initially composed of 37 ministries, the administration underwent changes to its ministerial structure and adopted a new government identity and slogan, "On the Side of the Brazilian People", in 2025.
=== PD-1 === Pembrolizumab (Keytruda, formerly MK-3475 and lambrolizumab) was developed by Merck and first approved by the Food and Drug Administration in 2014 for the treatment of melanoma. It was later approved for metastatic non-small cell lung cancer and head and neck squamous cell carcinoma. In 2017, it became the first immunotherapy drug approved for use based on the genetic mutations of the tumor rather than the site of the tumor. It was shown that patients with higher non-synonymous mutation burden in their tumors respond better to the treatment. Both their objective response rate and progression-free survival was shown to be higher than in patients with low non-synonymous mutation burden. Nivolumab (Opdivo) was developed by Bristol-Myers Squibb and first approved by the FDA in 2014 for the treatment of melanoma. It was later approved for squamous cell lung cancer, renal cell carcinoma, and Hodgkin's lymphoma. Cemiplimab (Libtayo) was developed by Regeneron Pharmaceuticals and first approved by the FDA in 2018 for the treatment of cutaneous squamous cell carcinoma (CSCC) or locally advanced CSCC who are not candidates for curative surgery or curative radiation. Dostarlimab (Jemperli) – was developed by GlaxoSmithKline and was first approved for the treatment of mismatch repair deficient (dMMR) recurrent or advanced endometrial cancer by the FDA in April of 2021. On August 17, 2021, the FDA granted accelerated approval for the treatment of mismatch repair deficient (dMMR) recurrent or advanced solid tumors.
=== C4 === With the mass convergent evolution of the C4-fixation pathway in a diversity of plant lineages, ancestral C3-type RuBisCO evolved to have faster turnover of CO2 in exchange for lower specificity as a result of the greater localization of CO2 from the mesophyll cells into the bundle sheath cells. This was achieved through enhancement of conformational flexibility of the "open-closed" transition in the Calvin cycle. Laboratory-based phylogenetic studies have shown that this evolution was constrained by the trade-off between stability and activity brought about by the series of necessary mutations for C4 RuBisCO. Moreover, in order to sustain the destabilizing mutations, the evolution to C4 RuBisCO was preceded by a period in which mutations granted the enzyme increased stability, establishing a buffer to sustain and maintain the mutations required for C4 RuBisCO. To assist with this buffering process, the newly-evolved enzyme was found to have further developed a series of stabilizing mutations. While RuBisCO has always been accumulating new mutations, most of these mutations that have survived have not had significant effects on protein stability. The destabilizing C4 mutations on RuBisCO has been sustained by environmental pressures such as low CO2 concentrations, requiring a sacrifice of stability for new adaptive functions.
Sources: en.wikipedia.org
=== FORTUNE, Modern Healthcare and Press Ganey awards === Southern Ohio Medical Center has been recognized as one of FORTUNE Magazine’s Best Places to Work in America for six straight years. In 2013, it came in 29th on the list with FORTUNE noting: “Employees are proud to work for a medical provider that has won numerous awards for patient care, a fact that's reflected in its average tenure. Nearly 20% of the staff has worked there for more than 20 years.” SOMC was recognized on the FORTUNE list again in 2014 (coming in 18th) and 2015 (coming in 44th). In the 2015 survey, 93% of SOMC employees described their workplace as "a great place to work." Modern Healthcare Magazine also recognized SOMC as one of the nation's best healthcare employers in 2010, 2011 and 2012. In 2012, Southern Ohio Medical Center was one of only 13 Press Ganey clients in the nation to be chosen as a Distinctive Workplace Award winner. The award was given to organizations that reached, and sustained, the 95th percentile in employee satisfaction – SOMC was at the 99th percentile.
=== Early years === Brothers Jim and William Reid formed a band in the early 1980s in response to their distaste of the music at the time, saying, "It was the crap coming out of the radio that made us want to be in a band". This worked in their favour, as William said, "It was perfect timing because there weren't any guitar bands. Everybody was making this electronic pop music." Before forming the band, the brothers had spent five years on the dole, during which they wrote and recorded songs at home and worked out the sound and image of the band. Originally called The Poppy Seeds, and then Death of Joey, they initially told journalists that they had taken their eventual name from a line in a Bing Crosby film, although six months later they admitted that this was not true. Other accounts suggest that the name derived from an offer on a breakfast cereal packet, where customers could send off for a gold Jesus & Mary chain. As neither brother wanted to be the singer, they decided on Jim via coin toss. The brothers started recording and sending demos to record companies in 1983 (using a Portastudio bought with £300 given to them by their father from redundancy pay after he lost his factory job), and by early 1984 they had recruited bass player Douglas Hart and teenage drummer Murray Dalglish. Early influences included the Velvet Underground, the Stooges, New York Dolls, Suicide, the Shangri-Las, and Einstürzende Neubauten.
=== Particle packing effects === Up until now, the focus has been mostly on the structure of the ice itself; the particles are almost an afterthought to the templating process but in fact, the particles can and do play a significant role during freeze-casting. It turns out that particle arrangement also changes as a function of the freezing conditions. For example, researchers have shown that freezing velocity has a marked effect on wall roughness. Faster freezing rates produce rougher walls since particles are given insufficient time to rearrange. This could be of use when developing permeable gas transfer membranes where tortuosity and roughness could impede gas flow. It also turns out that z- and r-crystals do not interact with ceramic particles in the same way. The z-crystals pack particles in the x-y plane while r-crystals pack particles primarily in the z-direction. R-crystals actually pack particles more efficiently than z-crystals and because of this, the area fraction of the particle-rich phase (1 - area fraction of ice crystals) changes as the crystal population shifts from a mixture of z- and r-crystals to only z-crystals. Starting from where ice crystals first begin to exclude particles, marking the beginning of the transition zone, we have a majority of r-crystals and a high value for the particle-rich phase fraction. We can assume that because the solidification speed is still rapid that the particles will not be packed efficiently.
Type 1 diabetes (T1D), or type 1 diabetes mellitus, is an autoimmune disease that occurs when the body's immune system destroys beta cells in the pancreas that produce the hormone insulin. Insulin is used by the body to store and convert blood sugar into energy. T1D results in high blood sugar levels in the body prior to treatment due to the lack of insulin. Common symptoms include frequent urination (polyuria), increased thirst (polydipsia), increased hunger (polyphagia), weight loss, and other changes. Additional symptoms may include blurry vision, tiredness, and slow wound healing (owing to impaired blood flow). While some cases take longer, symptoms usually appear within weeks to a few months. The cause of type 1 diabetes is not completely understood, but it is believed to involve an autoimmune attack caused by a combination of genetic and environmental factors. The underlying mechanism involves an autoimmune destruction of the insulin-producing beta cells in the pancreas. Diabetes is diagnosed by testing the level of sugar or glycated hemoglobin (HbA1C) in the blood. Type 1 diabetes can be distinguished from type 2 by testing for the presence of autoantibodies and/or declining levels/absence of C-peptide. C-peptide is a product cleaved from proinsulin in the production of insulin. In type 1 diabetes its levels are low or absent. In type 2 diabetes the blood levels are high, as insulin production is high due to insulin resistance. There is currently no known way to prevent type 1 diabetes. Treatment with insulin is required for survival.
=== Influence of preparation methods === Depending on the preparation and cooking methods, the nutritional value of potatoes can vary greatly. In particular, its energy content, moderate in comparison with other starchy foods, can increase considerably when cooked with fat, and its vitamin content is affected to a greater or lesser extent depending on the cooking method. However, cooking is essential to make it an appetizing and especially digestible food. In the raw potato, the starch is mainly in the form of resistant starch, so called because it resists digestive enzymes such as amylase. Under the effect of heat, around 50 °C, the amylose swells and causes the starch grains to burst, which "gelatinize" and lose their "resistant" character. However, when the preparation is subsequently cooled, e.g. in salads, the proportion of resistant starch increases due to a retrogradation of the amylose. In boiled potatoes, this proportion can be about 2% (of the total starch) and in potato salad it can be as high as 6%. The resistant starch remains intact in the large intestine, playing a role similar to that of dietary fiber, which may be of interest in some diets. A 100 g portion of potatoes simply boiled in their skins provides 76 kcal, which is comparable to corn porridge, also 76 kcal, or plantain (94), but is significantly lower than the same portion of dried beans (115), pasta (132), rice (135) or bread (278). They are often paired or cooked with dietary fats, which can significantly increase the potato dishes caloric value.
Sources: en.wikipedia.org
== Pathophysiology == Ketones are primarily produced from free fatty acids in the mitochondria of liver cells. The production of ketones is strongly regulated by insulin and an absolute or relative lack of insulin underlies the pathophysiology of ketoacidosis. Insulin is a potent inhibitor of fatty acid release, so insulin deficiency can cause an uncontrolled release of fatty acids from adipose tissue. Insulin deficiency can also enhance ketone production and inhibit peripheral use of ketones. This can occur during states of complete insulin deficiency (such as untreated diabetes) or relative insulin deficiency in states of elevated glucagon and counter-regulatory hormones (such as starvation, heavy chronic alcohol use or illness). Acetoacetic acid and β-hydroxybutyrate are the most abundant circulating ketone bodies. Ketone bodies are acidic; however, at physiologic concentrations, the body's acid/base buffering system prevents them from changing blood pH.
Copper chaperone for superoxide dismutase is a metalloprotein that is responsible for the delivery of Cu to superoxide dismutase (SOD1). CCS is a 54kDa protein that is present in mammals and most eukaryotes including yeast. The structure of CCS is composed of three distinct domains that are necessary for its function. Although CCS is important for many organisms, there are CCS independent pathways for SOD1, and many species lack CCS all together, such as C. elegans. In humans the protein is encoded by the CCS gene.
S3: The S3 pocket is located on the rim of the S1 pocket and is flat and exposed to the solvent. This pocket is not as important as S1 and S4. S4: The S4 pocket is hydrophobic in nature and the floor of the pocket is formed by Trp-215 residue. The residues Phe-174 and Tyr-99 of FXa join Trp-215 to form an aromatic box that is able to bind aliphatic, aromatic and positively charged fragments. Because of the binding to positively charged entities, it can be described as a cation hole.
== Academic and professional career == From 1995 to 1997, Mezzenga worked as a research assistant at CERN, in collaboration with NASA (NASA Space Shuttle Discovery mission STS91). He then served as a research assistant at EPFL from 1997 to 2001. Following the completion of his PhD, he was a postdoctoral fellow at the University of California, Santa Barbara (2001–2002), where he studied self-assembly phenomena in polymer and colloidal systems. In 2003, Mezzenga joined the Nestlé Research Center in Lausanne as a senior scientist in polymers and colloids physics. From 2005 to 2009, he held a joint appointment as associate professor of physics at the University of Fribourg and researcher at the Nestlé Research Center. In 2009, Mezzenga was appointed Full Professor at ETH Zurich where he founded, and continues to lead since, the Laboratory of Food and Soft Materials. Mezzenga has held visiting professorships at several institutions, including Aalto University (formerly Helsinki University of Technology), Monash University, RMIT University, Nanyang Technological University, the University of Cagliari, Sapienza University of Rome, and Indian Institute of Technology Kharagpur.
CB1 receptors are found primarily in the brain, particularly in the basal ganglia, limbic system, hippocampus, and striatum. They are also present in the cerebellum, and male and female reproductive systems, but absent in the medulla oblongata, which controls respiratory and cardiovascular functions. CB1 is also found in the human anterior eye and retina.
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.
Dry powder is normally held at -20 °C or lower, away from light and moisture. Sealed vials can also be kept at 2-8 °C for shorter intervals. Warming to room temperature before opening prevents condensation.