A practical reference on ACTH analog: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-06-11 and is reviewed periodically as new material appears.
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.
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.
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.
| 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.
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。
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.
Participants were randomized (1:1) to receive neoadjuvant pembrolizumab and enfortumab vedotin followed by surgery followed by adjuvant enfortumab vedotin in combination with pembrolizumab followed by pembrolizumab as a single agent or to undergo immediate surgery alone.
=== Regulation === Acetyl-CoA is formed into malonyl-CoA by acetyl-CoA carboxylase, at which point malonyl-CoA is destined to feed into the fatty acid synthesis pathway. Acetyl-CoA carboxylase is the point of regulation in saturated straight-chain fatty acid synthesis, and is subject to both phosphorylation and allosteric regulation. Regulation by phosphorylation occurs mostly in mammals, while allosteric regulation occurs in most organisms. Allosteric control occurs as feedback inhibition by palmitoyl-CoA and activation by citrate. When there are high levels of palmitoyl-CoA, the final product of saturated fatty acid synthesis, it allosterically inactivates acetyl-CoA carboxylase to prevent a build-up of fatty acids in cells. Citrate acts to activate acetyl-CoA carboxylase under high levels, because high levels indicate that there is enough acetyl-CoA to feed into the Krebs cycle and conserve energy. High plasma levels of insulin in the blood plasma (e.g. after meals) cause the dephosphorylation of acetyl-CoA carboxylase, thus promoting the formation of malonyl-CoA from acetyl-CoA, and consequently the conversion of carbohydrates into fatty acids, while epinephrine and glucagon (released into the blood during starvation and exercise) cause the phosphorylation of this enzyme, inhibiting lipogenesis in favor of fatty acid oxidation via beta-oxidation.
=== Controls === Hydraulically driven. An SAU-1T-2 automatic flight control system offers assisted manual or automatic flight, with no manual option. Four independent hydraulic systems power all flight controls and the built-in airstairs. Fluid is to the NGZh, rather than AMG, formula.
The functions of AGPs in plant growth and development processes rely heavily on the incredible diversity of their glycan and protein backbone moieties. In particular, it is the AG polysaccharides that are most likely to be involved in development. Most of the biological roles of AGPs have been identified through T-DNA insertional mutants characterization of genes or enzymes involved in AGP glycosylation, primarily in Arabidopsis thaliana. The galt2-6 single mutants revealed some physiological phenotypes under normal growth conditions, including reduced root hair length and density, reduced seed set, reduced adherent seed coat mucilage, and premature senescence. However, galt2galt5 double mutants showed more severe and pleiotropic physiological phenotypes than the single mutants with respect to root hair length and density and seed coat mucilage. Similarly, hpgt1hpgt2hpgt3 triple mutants showed several pleiotropic phenotypes including longer lateral roots, increased root hair length and density, thicker roots, smaller rosette leaves, shorter petioles, shorter inflorescence stems, reduced fertility, and shorter siliques. In the case of GALT31A, it has been found to be essential for embryo development in Arabidopsis. A T-DNA insertion in the 9th exon of GALT31A resulted in embryo lethality of this mutant line. Meanwhile, knockout mutants for KNS4/UPEX1 have collapsed pollen grains and abnormal pollen exine structure and morphology. In addition, kns4 single mutants exhibited reduced fertility, confirming that KNS4/UPEX1 is critical for pollen viability and development.
Sources: en.wikipedia.org
NAD-dependent deacetylase sirtuin-3, mitochondrial also known as SIRT3 is a protein that in humans is encoded by the SIRT3 gene. SIRT3 is member of the mammalian sirtuin family of proteins, which are homologs to the yeast Sir2 protein. SIRT3 exhibits NAD+-dependent deacetylase activity. Members of the sirtuin family are characterized by a sirtuin core domain and grouped into four classes, and the protein encoded by this gene is included in class I of the sirtuin family. The human sirtuins have a range of molecular functions and have emerged as important proteins in aging, stress resistance, and metabolic regulation. Yeast sirtuin proteins are known to regulate epigenetic gene silencing and suppress recombination of rDNA. In addition to protein deacetylation, studies have shown that the human sirtuins may also function as intracellular regulatory proteins with mono ADP ribosyltransferase activity.
=== Hobbies === Bush has been an avid reader throughout his adult life, preferring biographies and histories. During his presidency, Bush read the Bible daily, though at the end of his second term he said on television that he is "not a literalist" about Bible interpretation. Walt Harrington, a journalist, recalled seeing "books by John Fowles, F. Scott Fitzgerald, James Joyce, and Gore Vidal lying about, as well as biographies of Willa Cather and Queen Victoria" in his home when Bush was a Texas oilman. Other activities include cigar smoking and golf. Bush has also painted many paintings. One of his best-known projects is a collection of 43 paintings of immigrants, titled Out of Many, One. Another painting project was Portraits of Courage: A Commander in Chief's Tribute to America's Warrior.
=== Advantage === Komagataella is able to grow on simple, inexpensive medium, with high growth rate. Komagataella can grow in either shake flasks or a fermenter, which makes it suitable for both small- and large-scale production. Komagataella has two alcohol oxidase genes, Aox1 and Aox2, which include strongly inducible promoters. These two genes allow Komagataella to use methanol as a carbon and energy source. The AOX promoters are induced by methanol, and repressed by glucose. Usually, the gene for the desired protein is introduced under the control of the Aox1 promoter, which means that protein production can be induced by the addition of methanol on medium. After several researches, scientists found that the promoter derived from AOX1 gene in Komagataella is extremely suitable to control the expression of foreign genes, which had been transformed into the Komagataella genome, producing heterologous proteins. With a key trait, Komagataella can grow with extremely high cell density on the culture. This feature is compatible with heterologous protein expression, giving higher yields of production. Komagataella has a well-developed secretory pathway involving the Endoplasmic reticulum and a stacked Golgi apparatus, which is more similar to those of higher eukaryotes to that of Saccharomyces cerevisiae. This enables the efficient folding and post-translational modification of heterologous proteins, including the formation of disulfide bonds and glycosylation.
This bonds creates strong hydrogen bonds and leads to a strong interlocking amongst the acyl chains 5) why the presence of cholesterol; a sterol compound, inhibits ethanol's ability to disrupt the membrane and 6) deriving the molecular-level mechanism of the entire process.
=== Renal === Angiotensin II has a direct effect on the proximal tubules to increase Na+ reabsorption. It has a complex and variable effect on glomerular filtration and renal blood flow depending on the setting. Increases in systemic blood pressure will maintain renal perfusion pressure; however, constriction of the afferent and efferent glomerular arterioles will tend to restrict renal blood flow. The effect on the efferent arteriolar resistance is, however, markedly greater, in part due to its smaller basal diameter; this tends to increase glomerular capillary hydrostatic pressure and maintain glomerular filtration rate. A number of other mechanisms can affect renal blood flow and GFR. High concentrations of Angiotensin II can constrict the glomerular mesangium, reducing the area for glomerular filtration. Angiotensin II is a sensitizer to tubuloglomerular feedback, preventing an excessive rise in GFR. Angiotensin II causes the local release of prostaglandins, which, in turn, antagonize renal vasoconstriction. The net effect of these competing mechanisms on glomerular filtration will vary with the physiological and pharmacological environment.
Sources: en.wikipedia.org
{\displaystyle {\begin{aligned}{\frac {\mathbf {D} m}{\mathbf {Dt} }}&={\iiint \limits _{V}}\left({{\frac {\mathbf {D} \rho }{\mathbf {Dt} }}+\rho (\nabla \cdot \mathbf {u} )}\right)dV\\{\frac {\mathbf {D} \rho }{\mathbf {Dt} }}+\rho (\nabla \cdot {\mathbf {u} })&={\frac {\partial \rho }{\partial t}}+({\nabla \rho })\cdot {\mathbf {u} }+{\rho }(\nabla \cdot \mathbf {u} )={\frac {\partial \rho }{\partial t}}+\nabla \cdot ({\rho \mathbf {u} })=0\end{aligned}}}
Freeze branding (sometimes called CryoBranding and the resulting brands, trichoglyphs) is a technique involving a cryogenic coolant instead of heat to produce permanent marks on a variety of animals. The coolant is used to lower the temperature of a branding iron such that its application to shaved skin will permanently alter hair follicles. The intense cold destroys the pigmentation apparatus in the animal's hair follicles, leaving all subsequent hair growth without color. This creates a high-contrast, permanent mark in the shape of the branding iron's head. A longer application of the cold iron can also permanently remove hair and is used on white or pale animals. In these cases, the loss of hair leaves a patch of hairless skin in the shape of the brand. The technique is most commonly used as an identification mark for ownership, although it finds application in biological studies of wild animals as well. Freeze branding is most often used on mammalian livestock with smooth coats such as cattle, donkeys and horses although it has been used successfully on a wide variety of other mammals, as well as frogs, newts, snakes, fish and even crabs. Freeze branding is often seen as a more ethical alternative to traditional hot branding, so much so that experts have called for the prohibition of hot branding in favor of the cryogenic technique. Hot branding involves the use of an iron stamp heated to around 500 ºC (930 ºF), a temperature sufficient to destroy all three layers of an animal's skin and leave a permanent scar.
=== Suppression tests === Normally, endogenous insulin production is suppressed in the setting of hypoglycemia. A 72-hour fast, usually supervised in a hospital setting, can be done to see if insulin levels fail to suppress, which is a strong indicator of the presence of endogenous hyperinsulinemia, of which the most common cause is insulinoma (followed by autoimmune causes). During the test, the patient may have calorie-free and caffeine-free liquids. Capillary blood glucose is measured every 4 hours using a reflectance meter, until values < 60 mg/dL (3.3 mmol/L) are obtained. Then, the frequency of blood glucose measurement is increased to every hour until values are < 49 mg/dL (2.7 mmol/L). At that point, or when the patient has symptoms of hypoglycemia, a blood test is drawn for serum glucose, insulin, proinsulin, and C-peptide levels. The fast is then stopped at that point, and the hypoglycemia is corrected with intravenous dextrose or carbohydrate-containing food or drink.
== Trials == Howard Florey's team at Oxford showed that Penicillium extract killed many kinds of bacteria. Gardner and Orr-Ewing tested it against gonococcus (against which it was most effective), meningococcus, streptococcus, staphylococcus, Bacillus anthracis, actinomyces and tetanus bacterium (Clostridium tetani) and the bacteria that cause gangrene. They observed bacteria attempting to grow in the presence of penicillin, and noted that penicillin was neither an enzyme that broke the bacteria down, nor an antiseptic that killed them; rather, it was a chemical that interfered with the process of cell division. Jennings observed that it had no effect on white blood cells, and would therefore reinforce rather than hinder the body's natural defences against bacteria. She also found that unlike sulphonamides, the first and only effective broad-spectrum antibiotic available at the time, it was not destroyed by pus. Medawar found that it did not affect the growth of tissue cells.
== Overview == One of the distinguishing features of ColdFusion is its associated scripting language, ColdFusion Markup Language (CFML). CFML compares to the scripting components of ASP, JSP, and PHP in purpose and features, but its tag syntax more closely resembles HTML, while its script syntax resembles JavaScript. ColdFusion is often used synonymously with CFML, but there are additional CFML application servers besides ColdFusion, and ColdFusion supports programming languages other than CFML, such as server-side Actionscript and embedded scripts that can be written in a JavaScript-like language known as CFScript. Originally a product of Allaire and released on July 2, 1995, ColdFusion was developed by brothers Joseph J. Allaire and Jeremy Allaire. In 2001 Allaire was acquired by Macromedia, which in turn was acquired by Adobe Systems Inc in 2005. ColdFusion is most often used for data-driven websites or intranets, but can also be used to generate remote services such as REST services, WebSockets, SOAP web services or Flash remoting. It is especially well-suited as the server-side technology to the client-side ajax. ColdFusion can also handle asynchronous events such as SMS and instant messaging via its gateway interface, available in ColdFusion MX 7 Enterprise Edition.
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 usually kept at about -20 degrees Celsius for long-term storage and at 2 to 8 degrees Celsius for short working periods. Containers should stay sealed and protected from light and moisture to limit degradation.