Everything below concerns heptapeptide. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-07-18. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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 |
|---|---|---|
| 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 |
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.
Laboratory work points toward modulation of neurotrophic signaling, particularly expression of brain-derived neurotrophic factor and nerve growth factor in hippocampal tissue. Studies also describe effects on monoamine turnover, inflammatory mediators, and oxidative markers. These observations come mainly from animal models and cultured cells, so the causal chain in humans is not firmly established. Whether the reported molecular changes translate into measurable clinical benefit is an open question. Reviews generally present the mechanism as plausible rather than demonstrated.
Claims about enhanced focus, memory, or mood in healthy people rest mostly on anecdotal reports and community discussion rather than on controlled data. It remains unclear whether any cognitive benefit observed in patients recovering from brain injury would extend to uninjured users. Dose-response relationships, long-term safety, and interactions with other drugs are not well characterized in the peer-reviewed literature. Questions about optimal route of administration and treatment duration likewise remain open.
Semax binds to melanocortin receptors and is thought to influence neuronal survival and plasticity rather than to act through the adrenal axis. Laboratory work has shown increased expression of brain-derived neurotrophic factor and nerve growth factor in treated tissue. Changes in c-Fos, a marker of neuronal activation, have also been reported. Because the peptide is rapidly degraded by peptidases, its effects are generally attributed to downstream signaling cascades rather than to sustained receptor occupancy.
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.
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.
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.
In mass spectrometry, matrix-assisted ionization (also inlet ionization) is a low fragmentation (soft) ionization technique which involves the transfer of particles of the analyte and matrix sample from atmospheric pressure (AP) to the heated inlet tube connecting the AP region to the vacuum of the mass analyzer. Initial ionization occurs as the pressure drops within the inlet tube. Inlet ionization is similar to electrospray ionization in that a reverse phase solvent system is used and the ions produced are highly charged, however a voltage or a laser is not always needed. It is a highly sensitive process for small and large molecules like peptides, proteins and lipids that can be coupled to a liquid chromatograph. Inlet ionization techniques can be used with an Orbitrap mass analyzer, Orbitrap fourier transform mass spectrometer, linear trap quadrupole and MALDI-TOF.
=== Marijuana === Moore supported legislation introduced and passed during the 2022 legislative session that created a ballot referendum to legalize recreational marijuana in Maryland, and another bill that would regulate marijuana possession should the referendum pass in November. During his 2022 gubernatorial campaign, Moore talked about implementing a recreational cannabis industry with a focus on equity "so that communities that have experienced the greatest disparities benefit the most." Question 4 passed with 67.2 percent of voters approving the measure on November 8, 2022. In January 2023, Moore signed an executive order releasing $46.5 million to start developing the framework for a recreational marijuana industry in the state, with a majority of the released funds going toward grants for minority-owned firms. In May 2023, he signed a bill regulating the state's recreational marijuana industry. In October 2022, Moore praised President Joe Biden's pardon of thousands of people convicted of marijuana possession under federal law, and said that he would "fight to expunge the records of those arrested for marijuana possession [as governor]". In June 2024, Moore signed an executive order pardoning about 100,000 people with low-level cannabis-related convictions in Maryland. In June 2025, he pardoned an additional 6,900 individuals convicted of simple cannabis possession. In May 2023, Moore allowed a bill that prohibits police from stopping a vehicle solely based on if they smell marijuana to become law without his signature.
=== Breast cancer === Pregnancy has a positive effect on the prognosis of breast cancer according to several studies and it apparently increases the chance of survival after diagnosis of breast cancer. Possible positive effects of pregnancy could be explained by the persistence of fetal cells in the blood and maternal tissues. Fetal cells are probably actively migrating from peripheral blood into the tumor tissue where they are preferentially settled in the tumor stroma and one their concentration decreases as they get closer to the healthy breast tissue. There are two suggested mechanisms by which the fetal cells could have the positive effect on the breast cancer prognosis. The first mechanism suggests that fetal cells only oversee cancer cells and they attract components of the immune system if needed. The second option is that the down-regulation of the immune system induced by the presence of fetal cells could ultimately lead to cancer prevention, because women in whom FMC is present produce lower concentrations of inflammatory mediators, which may lead to the development of neoplastic tissue. The effect also depends on the level of microchimerism: Hyperchimerism (a high rate of microchimerism) and hypochimerism (a low rate of microchimerism) can be related to the negative effect of FMC and thus can promote a worse prognosis of breast cancer. Apparently, women with breast cancer may fail in the process of obtaining and maintaining allogeneic fetal cells.
== History == In 2009, Zimbabwe Cricket announced a major restructure of domestic cricket in Zimbabwe and the traditional provincial sides were replaced with regional franchises. Midlands was renamed Mid West Rhinos and based in the mining town of Kwekwe. With the new franchise system in place the season got under way on 14 September 2009. Current captain Vusimuzi Sibanda was the first person to score a hundred under the new 'Mid West Rhinos' name as they convincingly beat the newly titled Matabeleland Tuskers by 135 runs. Sadly for the Rhinos, the season ended in a tense draw that saw the Mashonaland Eagles triumph narrowly. The 2010/11 season was a promising for the Rhinos as they retained the services of a number of top Zimbabwe players. Once again, they failed to win any trophies despite winning 4 games and losing only 2 in the newly branded Castle Logan Cup. Throughout the following seasons, the Rhinos have had many successes but failed to win any trophies. Despite a delay to the start of the 2014/15 season, the season began with the Mid West Rhinos tipped to be one of the stronger sides in both the four-day and one-day competitions. However, amid off-field issues affecting both the Rhinos and Zimbabwean cricket as a whole, the first part of the season saw mixed results. The only win for the Rhinos in the Logan Cup before Christmas came as a result of a poor performance by the Mashonaland Eagles in the season opener.
Sources: en.wikipedia.org
There are more than 50 types of treatments for CTS with varied levels of evidence and recommendations across healthcare guidelines, with evidence most strongly supporting surgery, steroids, splinting for wrist positioning, and physical or occupational therapy interventions. When selecting treatment, it is important to consider the severity and chronicity of the CTS pathophysiology and to distinguish treatments that can alter the natural history of the pathophysiology (disease-modifying treatments) and treatments that only alleviate symptoms (palliative treatments). The strongest evidence for disease-modifying treatment in chronic or severe CTS cases is carpal tunnel surgery to change the shape of the carpal tunnel. The American Academy of Orthopedic Surgeons recommends proceeding conservatively with a course of nonsurgical therapies tried before release surgery is considered. A different treatment should be tried if the current treatment fails to resolve the symptoms within 2 to 7 weeks. Early surgery with carpal tunnel release is indicated where there is evidence of median nerve denervation or a person elects to proceed directly to surgical treatment. Recommendations may differ when carpal tunnel syndrome is found in association with the following conditions: diabetes mellitus, coexistent cervical radiculopathy, hypothyroidism, polyneuropathy, pregnancy, rheumatoid arthritis, and carpal tunnel syndrome in the workplace. CTS related to another pathophysiology is addressed by treating that pathology.
== Symbols and units == The IUPAC-recommended symbols for mass and charge are m and Q, respectively, however using a lowercase q for charge is also very common. Charge is a scalar property, meaning that it can be either positive (+) or negative (−). The Coulomb (C) is the SI unit of charge; however, other units can be used, such as expressing charge in terms of the elementary charge (e). The SI unit of the physical quantity m/Q is kilogram per coulomb.
== Medical uses == Fremanezumab is indicated for the preventive treatment of migraine in adults; and the preventive treatment of episodic migraine in children who are aged 6 to 17 years of age and who weigh 45 kilograms (99 lb) or more. Fremanezumab was shown to be effective in adults with four or more attacks per month.
Denmark has a long tradition for cooperative production and trade on a large scale. The most notable cooperative societies today includes the agricultural coop of Dansk Landbrugs Grovvareselskab (DLG), dairy producer Arla Foods and the retail cooperative Coop Danmark. Coop Danmark started out as "Fællesforeningen for Danmarks Brugsforeninger" (FDB) in 1896 and now has around 1.4 million members in Denmark as of 2017. It is part of the larger multi-sector cooperative Coop amba which has 1.7 million members in that same year. The cooperative structure also extends to both the housing and banking sector. Arbejdernes Landsbank, founded in 1919, is the largest bank cooperative and it is currently the 6th largest bank in the country as of 2018. The municipality of Copenhagen alone holds a total of 153 housing cooperatives and "Arbejdernes Andelsboligforening Århus" (AAB Århus) is the largest individual housing cooperative in Denmark, with 23,000 homes in Aarhus.
The sample may be introduced into the column at any time during the column equilibration step or after equilibration has been accomplished. After the volume of eluant surpasses the volume of the mobile phase in the column, the sample components will begin to elute. Compounds with a partition coefficient of unity will elute when one column volume of mobile phase has passed through the column since the time of injection. The compound can then be introduced to another stationary phase to help increase the resolution of results. The flow is stopped after the target compound(s) are eluted or the column is extruded by pumping the stationary phase through the column. An example of a major application of countercurrent chromatography is to take an extremely complex matrix such as a plant extract, perform the countercurrent chromatography separation with a carefully selected solvent system, and extrude the column to recover all of the sample. The original complex matrix will have been fractionated into discrete narrow polarity bands, which may then be assayed for chemical composition or bioactivity. Performing one or more countercurrent chromatography separations in conjunction with other chromatographic and non chromatographic techniques has the potential for rapid advances in compositional recognition of extremely complex matrices.
Sources: en.wikipedia.org
== Parenteral formulations == These are also called injectable formulations and are used with intravenous, subcutaneous, intramuscular, and intra-articular administration. The drug is stored in liquid or if unstable, lyophilized form. Many parenteral formulations are unstable at higher temperatures and require storage at refrigerated or sometimes frozen conditions. The logistics process of delivering these drugs to the patient is called the cold chain. The cold chain can interfere with delivery of drugs, especially vaccines, to communities where electricity is unpredictable or nonexistent. NGOs like the Gates Foundation are actively working to find solutions. These may include lyophilized formulations which are easier to stabilize at room temperature. Most protein formulations are parenteral due to the fragile nature of the molecule which would be destroyed by enteric administration. Proteins have tertiary and quaternary structures that can be degraded or aggregated at room temperature. This can impact the safety and efficacy of the medicine.
=== Artificial === De novo designed peptides which self-assemble in the presence of copper (Cu), forming supramolecular assemblies were presented by Korendovych et al. Additionally there are examples of metallopeptides that are, at least partially, composed of non-natural amino acids with possible applications in drug discovery and biomaterials.
== Mechanism == Type 1 encodes FKBP65, an endoplasmic reticulum associated peptidyl-prolyl cis/trans isomerase (PPIase) that functions as a chaperone in collagen biosynthesis. Osteoblasts deficient in FKBP65 have a buildup of procollagen aggregates in the endoplasmic reticulum which reduces their ability to form bone. Furthermore, Bruck syndrome type 1 patients have under-hydroxylated lysine residues in the collagen telopeptide and as a result show diminished hydroxylysylpyridinoline cross-links. Type 2 encodes the enzyme, lysyl hydroxylase 2, which catalyzes hydroxylation of lysine residues in collagen cross-links. PLOD2 is most expressed in active osteoblasts since collagen cross-linking is tissue-specific. Mutation in PLOD2 alters the structure of telopeptide lysyl hydroxylase and prevents fibril formation of collagen type 1. Bone analysis shows the lysine residues of telopeptides in collagen type 1 are under-hydroxylated.
Amitriptyline, formerly sold under the brand name Elavil among others, is a tricyclic antidepressant primarily used to treat major depressive disorder, and a variety of pain syndromes such as neuropathic pain, fibromyalgia, migraine and tension headaches. Due to the frequency and prominence of side effects, amitriptyline is generally considered a second-line therapy for these indications. The most common side effects are dry mouth, drowsiness, dizziness, constipation, and weight gain. Glaucoma, liver toxicity and abnormal heart rhythms are rare but serious side effects. Blood levels of amitriptyline vary significantly from one person to another, and amitriptyline interacts with many other medications potentially aggravating its side effects. Amitriptyline was discovered in the late 1950s by scientists at Merck and approved by the US Food and Drug Administration (FDA) in 1961. It is on the World Health Organization's List of Essential Medicines. It is available as a generic medication. In 2023, it was the 90th most commonly prescribed medication in the United States, with more than 7 million prescriptions.
=== China === As of March 2025, the government is estimated to have 401 million barrels stored in above-ground facilities and 668 million barrels in above-ground commercial storage. By December 2025, United States Energy Information Administration estimated Chinese held around 1.4 billion barrels of crude oil in reserve from both government-held and state-owned national oil companies (NOC) inventories, which are both part of the strategic reserves. Outside of the official strategic reserves, Chinese corporate and commercial refineries also have several hundred million barrels of crude oil. China hiked prices serveal times during the war, but due to queue forming in the gas stations in multiple Chinese cities, the Chinese government reduced its planned fuel price hikes. China's large strategic reserve helped the country insulate itself significantly from the 2026 Iran war and ensuing global fuel crisis. By late June 2026, China's strategic petroleum reserve (SPR) remained nearly unchanged after the Iran war. To ensure domestic supplies without using strategic reserve, China halted its supplies of refined oil products to other countries. China is a major oil refiner and exporter of petroleum products. On 5 March, major Chinese refiners, including China Petroleum & Chemical (Sinopec) and Rongsheng Petrochemical Co Ltd, were ordered by the government to stop accepting new fuel export contracts. Jet fuel refuelling for international flights and supplies to Hong Kong and Macau are exempt from this guidance.
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.
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。