Everything below concerns semax. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2025-12-10. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
Semax is supplied as a lyophilized powder that appears white to off-white. It dissolves readily in water, phosphate-buffered saline, and other aqueous media, which simplifies preparation of working solutions for laboratory use. The nasal products registered in Russia are dilute aqueous solutions, typically around 0.1 percent peptide by weight. Organic solvents are rarely necessary and can complicate handling. Because the peptide is hygroscopic, weighing should be performed quickly and with minimal exposure to ambient humidity.
Solid material is normally kept at minus 20 degrees Celsius in a sealed, desiccated container. Reconstituted solutions are less stable and are usually divided into single-use aliquots before freezing. Repeated freeze-thaw cycles are avoided because they promote aggregation and loss of activity. Light exposure is minimized by using amber glassware or foil wrapping. Published stability data for this peptide are sparse, so recommended storage conditions rest mainly on general practice for short synthetic peptides rather than on dedicated study.
Identity and purity are commonly assessed by reversed-phase high-performance liquid chromatography, with ultraviolet detection near 214 nanometers for the peptide backbone. Mass spectrometry, either electrospray or matrix-assisted laser desorption, confirms molecular mass and detects truncation or modification products. Amino acid analysis can verify composition. Because the sequence contains no strongly absorbing aromatic residue apart from phenylalanine, detection wavelengths are chosen carefully. Purity values above 95 percent are typical for research-grade material.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C37H51N9O10S | Seven-residue peptide |
| Molecular mass | 813.9 Da | Monoisotopic value |
| Appearance | White to off-white powder | Lyophilized form |
| Solubility | Freely soluble in water | Also soluble in saline and polar solvents |
| Storage (dry) | -20 °C or lower | Desiccated, protected from light |
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.
Semax is a synthetic heptapeptide developed in the Soviet Union during the 1980s by researchers at the Institute of Molecular Genetics in Moscow. It was designed as a truncated analog of adrenocorticotropic hormone, retaining only the fragment spanning residues four through ten. Investigators sought a peptide that would preserve the cognitive effects associated with ACTH while eliminating the hormonal stimulation of the adrenal cortex. The compound entered clinical use in Russia during the following decade.
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。
Semax is a synthetic heptapeptide whose sequence is Met-Glu-His-Phe-Pro-Gly-Pro. It was developed as a fragment analog of adrenocorticotropic hormone, modeled specifically on the ACTH(4-10) region. The first four residues reproduce that fragment, while a Pro-Gly-Pro tripeptide is appended at the C-terminus. Work on the compound originated in Russia, where it entered clinical use as an intranasal preparation. Its sequence places it among short regulatory peptides studied for effects on the central nervous system rather than on the adrenal axis.
The C-terminal Pro-Gly-Pro extension is not incidental. Proline-rich tails are known to resist several common peptidases, and the published literature attributes the longer half-life of Semax, relative to unmodified ACTH fragments, to this feature. The modification also removes the melanocyte-stimulating and corticosteroidogenic activity that characterizes longer ACTH-derived sequences. Because the molecule is small and hydrophilic, it is typically formulated as an aqueous solution for intranasal or parenteral delivery. Acetylation or amidation at the termini appears in closely related research peptides and shifts the mass by a fixed increment.
Identity and purity of semax are established with reversed-phase high-performance liquid chromatography coupled to ultraviolet detection, usually at 214 nanometres. Mass spectrometry, most often electrospray ionisation in positive mode, confirms the molecular mass and reveals truncated sequences. Amino acid analysis and peptide mapping after enzymatic digestion provide additional structural confirmation. Laboratories typically report purity as the percentage area of the main peak, a figure that does not capture isomeric or oxidised variants unless the method resolves them.
The peptide is prone to several degradation pathways. Oxidation of the methionine residue produces a sulfoxide that elutes close to the parent peak in many chromatographic systems. Hydrolysis of peptide bonds and deamidation of susceptible residues in related sequences also reduce purity over time. Lyophilised material kept dry at minus twenty degrees Celsius and shielded from light is the most stable form commonly described in laboratory practice.
Material sold for laboratory use varies widely in stated purity and documentation. A certificate of analysis should list the analytical method, the column and detector used, and the observed purity value. Independent verification by an outside laboratory is the practical way to confirm identity when documentation is absent or internally inconsistent. Regulatory status differs by country, and a product legal in one jurisdiction may be unapproved or controlled in another.
== Regulatory in the U.S. == The Clinical Laboratory Improvement Amendments (CLIA) regulate any laboratory testing and require laboratories to obtain certificates to do any testing on human specimens for health assessment or to diagnose, prevent, or treat disease. Three federal agencies partner together to cover the responsibilities put forward in the regulations: the Food and Drug Administration (FDA), Centers for Medicare & Medicaid Services (CMS), and the Centers for Disease Control and Prevention (CDC). In addition, accreditation standards developed by Joint Commission and College of American Pathologists have been developed to improve quality.
== Veterinary use == In the 17th century Robert Boyle investigated opium as a poison by giving opium to a dog. This experiment is the earliest documented use of an opioid in a domestic animal. In 1659, Christopher Wren and Boyle induced stupor in a dog via intravenous administration. Friedrich Wilhelm Adam Sertürner after isolating morphine from opium administered an aqueous alcoholic solution of morphine to four dogs and a mouse — one dog died and the others experienced sedation, convulsion, and emesis. Frederick Hobday was the first to report the varied effects of morphine in different species: in 1908 Hobday reported that morphine causes delirium in cats and horses but for dogs it induced anaesthesia. Hobday proposed that dogs be given 1/16th of a grain per pound to induce analgesia and anaesthesia in dogs. Despite the understanding of morphine's use in dogs it was not considered useful for other animals and in 1917, Howard Jay Milks wrote that morphine did not induce analgesia in animals other than dogs. Milks did report that 2 to 5 grains of morphine induced sedation in horses. Most research afterwards was more concerned with adverse effects of morphine as opposed to analgesic potential and opioids were not frequently used until the 1980s in veterinary practice, when an increased awareness of providing analgesia began to occur. Common routes for administration of opioids in veterinary medicine are intra-articular, intravenous, subcutaneous, intramuscular, intranasal, and transdermal. Common opioids in veterinary medicine are: morphine, fentanyl, and buprenorphine.
CEEs are a combination of estrogens, or agonists of the estrogen receptors. The major estrogen in CEEs, sodium estrone sulfate, itself is inactive, and rather serves as a prodrug of estrone and then of estradiol. The transformation of estrone sulfate to estrone is catalyzed by steroid sulfatase, and of estrone into estradiol by 17β-hydroxysteroid dehydrogenase. CEEs (as Premarin) and estrone have been found to be equivalent in potency in an animal model of estrogenic activity. On the other hand, the active forms of the equine estrogens in CEEs, such as equilin and 17β-dihydroequilin, have greater potency in the liver relative to bioidentical estradiol, similarly to synthetic estrogens like ethinylestradiol and diethylstilbestrol. This results in disproportionate effects on liver protein production compared to estradiol, although to a lesser extent than ethinylestradiol and diethylstilbestrol. In addition, 17β-dihydroequilenin has shown a selective estrogen receptor modulator (SERM)-like profile of estrogenic activity in studies with monkeys, in which beneficial effects on bone and the cardiovascular system were observed but proliferative responses in breast or endometrium were not seen, although the clinical significance of this is unknown. CEEs consists of the sodium salts of the sulfate esters of equine estrogens in a specific and consistent composition (see the table). The major estrogens in CEEs are sodium estrone sulfate and sodium equilin sulfate, which together account for approximately 71.5–92.0% of the total content of CEEs.
=== Molecular sieve === Molecular sieve is a material containing tiny pores of a precise and uniform size that is used as an absorbent for gases and liquids. They are metal alumino silicates which have a crystalline structure consisting of an assembly of tetrahedral. The tetrahedral are made up of 4 oxygen atoms which occupy the summits surrounding either 1 silicon atom or an aluminium atom placed in the center. Compensating cations (sodium, potassium) make the hole electrically neutral. The hole forms an assembly of small cells (or pores) of uniform and known size, in which a molecule of smaller size can be trapped by the phenomenon known as absorption. To ensure the dehydration of the fresh natural flowers the mixture of organic solvents is poured onto the hole until the level exceeds the level of the flowers by about 2 cm (0.79 in). The water molecules are progressively absorbed into the small cells or pores of the molecular sieve. The receptacle is closed hermetically for a few days. Once dried, the flower reabsorbs a little moisture of atmospheric origin, and this increases its suppleness and its plasticity. As molecular sieve relates to the long-term preservation and treatment of cut flowers for long duration, (i.e., continually maintaining their decorative properties), Vermont Flowers has been using this method of preserving flowers instead of the traditional silica gel more than 20 years ago. The advantage was a much more professional regeneration of the molecular sieves.
Sources: en.wikipedia.org
In Islam, embalming of the dead is not practiced, except in cases of necessity, such as when a body is being transported internationally and the law requires it to be embalmed. Muslims bury their deceased without delay (preferably within 24 hours), to allow the soul to transition to the afterlife as soon as possible. Buddhists generally do not favor embalming, but it is not strictly prohibited in most Buddhist traditions. The practice of embalming varies among different Buddhist schools and cultures. In Theravada Buddhism, embalming is allowed but not considered essential. However, in Tibetan Buddhism, embalming is typically discouraged and should not take place. The increasingly global nature of communities and far longer delays between death and final disposition caused by modern requirements and often distant families mean that embalming is frequently required either by law or common sense due to issues of transportation and holding requirement. Thus most religious authorities relent to its necessity in specific circumstances
The term diabetes is derived from the Ionic for 'siphon', meaning "to pass or run through". It reflects the dominant notion at the time that fluids consumed by the diabetic patient passed through the body unchanged, as if flowing through a tube or siphon. A number of conflicting accounts exist as to the first use of this term, placing the originator as either Apollonius of Memphis (fl. 3rd century BC), Demetrius of Apamea (fl. 100 BC), or Aretaeus of Cappadocia (fl. early 2nd century AD). In-depth probes of Greek etymology agree that the term came from Demetrius of Apamea, C. L. Gemmill (1972) states:Caelius Aurelianus prepared a Latin version of the works of Soranus. In the index of the Drabkin edition there is a subject heading "Diabetes," but on examination of the text this section could not be found (footnote 3, p. 776) except for a short paragraph. In this paragraph Caelius quotes Apollonius of Memphis as separating two forms of dropsy, one marked by retention of fluid and the other by the inability to retain fluid; the patient discharges whatever he drinks as if it were passed through a pipe. Apollonius lived in the second half of the third century B.C. Caelius Aurelianus continues by stating that Demetrius of Apamea distinguishes this disease from dropsy in which any fluid that is drunk is discharged as urine. Demetrius calls this condition diabetes. The time of Demetrius of Apamea is given as the first century B.C. None of his works have come down to us; we have only quotations in later authors.
=== Electrolysis === Electrowinning and electrorefining respectively involve the recovery and purification of metals using electrodeposition of metals at the cathode, and either metal dissolution or a competing oxidation reaction at the anode.
Consequent to the Sino-Soviet split, the pragmatic China established politics of détente with the United States in an effort to publicly challenge the Soviet Union for leadership of the international Marxist–Leninist movement. Mao Zedong's pragmatism permitted geopolitical rapprochement and eventually facilitated President Richard Nixon's 1972 visit to China which subsequently ended the policy of the existence to Two Chinas when the United States sponsored the People's Republic of China to replace the Republic of China (Taiwan) as the representative of the Chinese people at the United Nations. In the due course of Sino-American rapprochement, China also assumed membership in the Security Council of the United Nations. In the post-Mao period of Sino-American détente, the Deng Xiaoping government (1982–1987) affected policies of economic liberalisation that allowed continual growth for the Chinese economy. The ideological justification is socialism with Chinese characteristics, the Chinese adaptation of Marxism–Leninism.
Mammals regulate their core temperature using input from thermoreceptors in the hypothalamus, brain, spinal cord, internal organs, and great veins. Apart from the internal regulation of temperature, a process called allostasis can come into play that adjusts behaviour to adapt to the challenge of very hot or cold extremes (and to other challenges). These adjustments may include seeking shade and reducing activity, seeking warmer conditions and increasing activity, or huddling. Behavioral thermoregulation takes precedence over physiological thermoregulation since necessary changes can be affected more quickly and physiological thermoregulation is limited in its capacity to respond to extreme temperatures. When the core temperature falls, the blood supply to the skin is reduced by intense vasoconstriction. The blood flow to the limbs (which have a large surface area) is similarly reduced and returned to the trunk via the deep veins which lie alongside the arteries (forming venae comitantes). This acts as a counter-current exchange system that short-circuits the warmth from the arterial blood directly into the venous blood returning into the trunk, causing minimal heat loss from the extremities in cold weather. The subcutaneous limb veins are tightly constricted, not only reducing heat loss from this source but also forcing the venous blood into the counter-current system in the depths of the limbs.
Sources: en.wikipedia.org
== Development == In 1987 antistasin was tested as the first direct Xa inhibitor. Antistasin is a protein made up of 119 amino acid residues, of which 20 are cysteines involved in 10 disulfide bonds. It acts as a slow, tight-binding inhibitor of factor Xa with a Ki value of 0.3–0.6 nM but it also inhibits trypsin. Recombinant Antistasin can be produced by genetically modified yeast, saccharomyces cerevisiae. Another natural occurring direct Xa-inhibitor, the tick anticoagulant peptide (TAP), was discovered in 1990. It is a single-chain, 60 amino acid peptide and like antistasin it is a slow, tight-binding inhibitor with a similar Ki value (~0.6 nM). These two proteins were mostly used to validate factor Xa as a drug target. Animal studies suggested direct Xa-inhibition to be a more efficient approach to anticoagulation compared to direct thrombin inhibitors, especially offering a wider therapeutic window and reducing the risk of rebound thrombosis, (increase in thromboembolic events occurring shortly after the withdrawal of an antithrombotic medication) compared to direct and indirect thrombin inhibitors. During the 1990s several low-molecular-weight substances were developed, such as DX-9065a and YM-60828.
=== International institutions, associations, and coordinations === Asia/Pacific Group on Money Laundering Moneyval, the Committee of Experts on the Evaluation of Anti–Money Laundering Measures and the Financing of Terrorism, a monitoring body of the Council of Europe Financial Action Task Force on Money Laundering Inter-Governmental Action Group against Money Laundering in West Africa Association of Certified Anti-Money Laundering Specialists
== Growth and cultivation == Sophora flavescens is an evergreen slow growing shrub growing to 1.5 m (5 ft) by 1 m (3.3 ft). It is hardy to 0–10 °F (−18 – −12 °C) and to US zone 6. The plant prefers light (sandy), medium (loamy) and heavy (clay) soils and requires well-drained soil. The plant prefers acid, neutral and basic (alkaline) soils. It cannot grow in the shade. It requires moist soil. Like many other species in the family Fabaceae, this species can fix nitrogen.
derivatization The artificial modification of a molecule or protein with the intent of altering its solubility or other chemical properties so as to enable analysis (e.g. by mass spectroscopy or chromatography), or of labelling it by attaching a detectable chemical moiety (e.g. a fluorescent tag) to make it easier to identify and track in vivo. Molecules modified in this way are described as derivatives of their naturally occurring counterparts and are said to have been derivatized.
Sources: en.wikipedia.org
It is a synthetic peptide of seven amino acids. Its backbone corresponds to a fragment of adrenocorticotropic hormone extended at the carboxyl end. The material is distributed as a lyophilized solid for laboratory use.
The extension was introduced to slow enzymatic breakdown of the peptide in biological systems. Natural ACTH fragments are degraded rapidly by peptidases. Adding the tripeptide was intended to extend the window during which the molecule remains intact.
Most published work consists of animal experiments conducted in a small number of laboratories. Human data are limited in number and size. Whether the observed effects translate into reliable clinical benefit is still unresolved.
Solid peptide is best kept frozen at about minus 20 degrees Celsius in a sealed container with desiccant. It should be allowed to reach room temperature before opening to prevent condensation. Repeated warming and cooling of the same vial is discouraged.