Everything below concerns Lyophilized powder. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-06-20. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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 compound was developed in the 1980s at the Institute of Molecular Genetics in Moscow, where it emerged from research on short ACTH fragments and their effects on the central nervous system. Russian pharmaceutical listings describe it as a nootropic and neuroprotective agent, most often formulated as nasal drops. It is not a marketed medicine in the United States or the European Union, and no pharmacopoeial monograph covers it. Consequently, most published clinical experience with the substance originates from a small number of research centres, mainly in Russia and neighbouring countries.
Pharmacological accounts link semax to melanocortin signalling and to modulation of neurotrophic factor expression, particularly brain-derived neurotrophic factor and nerve growth factor. Much of this evidence comes from rodent studies using intranasal delivery, a route chosen because it allows peptides to reach the central nervous system with limited systemic exposure. Whether the same mechanisms operate in humans at comparable magnitude remains an open question. The precise receptor or receptors responsible for the reported behavioural and neuroprotective effects have not been conclusively identified.
Clinical reports describe use in ischaemic stroke, transient ischaemic attack, optic nerve conditions, and cognitive complaints, but most of these studies are small and were conducted in a single region. Systematic reviews have generally described the evidence base as limited in size and variable in methodological quality. Randomised controlled data suitable for international regulatory assessment are scarce. As a result, major treatment guidelines outside Russia do not include the peptide, and interest in it remains largely research-driven rather than routine clinical.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Lyophilised solid |
| Solubility class | Freely soluble in water | Also dissolves in aqueous buffers |
| Typical storage temperature | -20 °C | Dry, desiccated, protected from light |
| Typical analytical method | RP-HPLC with UV detection | Often paired with LC-MS |
| Water content | Reported as Karl Fischer value | Freeze-dried material is hygroscopic |
Stability depends heavily on physical state. Lyophilized powder held dry, cold and dark retains its content over long periods, whereas dissolved peptide begins to change within days at room temperature. The most cited degradation route is oxidation of the methionine residue, which converts the peptide to a sulfoxide form that elutes differently on chromatography. Hydrolysis of amide bonds and adsorption onto container walls contribute smaller losses. Buffers that exclude oxygen from the headspace slow the oxidation pathway, but no single condition prevents all change indefinitely.
Practical handling follows from those properties. Bulk material is best divided into single-use portions soon after receipt, because each thaw exposes the whole container to moisture and temperature cycling. Vials should be allowed to reach room temperature before opening to prevent condensation on the powder. Low-binding plasticware reduces loss of dilute solutions, and sterile filtration is used when a preparation must remain free of microbial growth. Records of batch number, reconstitution date and storage history are what allow a later analytical result to be interpreted meaningfully.
Identity and purity of Semax are established mainly by reversed-phase high-performance liquid chromatography coupled with mass spectrometry. The chromatographic trace gives a purity estimate as a percentage of total peak area, while electrospray or matrix-assisted laser desorption ionization confirms the molecular mass against the calculated value. Amino acid analysis and sequence-specific fragmentation provide further confirmation when a supplier's chain of custody is unclear. Vendors frequently quote a purity figure without stating the detection wavelength or the integration method, which limits how far one number can be compared with another.
研究兴趣主要集中在神经营养因子相关的路径上，包括脑源性神经营养因子与神经生长因子的表达变化。部分实验报告称在特定条件下观察到这些因子的水平上升，但具体信号通路和剂量依赖关系仍未完全厘清。多数公开数据来自细胞模型和动物实验，人体对照研究数量有限。因此，该化合物的作用机制在文献中属于活跃讨论，而非已经确立的定论。
Semax 是一种人工合成的七肽，氨基酸序列为 Met-Glu-His-Phe-Pro-Gly-Pro，单字母缩写记作 MEHFPGP。它被归类为促肾上腺皮质激素片段 ACTH(4-10) 的结构类似物，但并不天然存在于生物体内。母体片段 ACTH(4-10) 的序列为 Met-Glu-His-Phe-Arg-Trp-Gly，Semax 替换了中间两个残基，并在羧基端延长了 Pro-Gly-Pro 三肽。这种延长被普遍认为能提升分子对肽酶的耐受性。
该化合物于二十世纪八十年代在俄罗斯被开发，相关工作由俄罗斯科学院分子遗传学研究所的研究团队主导。开发目标并非复制 ACTH 的完整激素活性，而是寻找保留其神经作用方向、同时去除促肾上腺皮质激素释放效应的短肽片段。研究记录显示，这一方向促成了多个相关短肽的合成与筛选，而 Semax 是其中被研究最广泛的一个。当地文献常以 Семакс 这一名称指代它。
Identity and purity are established with standard peptide methods. Reversed-phase HPLC with ultraviolet detection near 214 nm resolves the parent peak from deletion and truncation byproducts, and reports typically quote a main-peak percentage. Mass spectrometry by electrospray or MALDI-TOF confirms the expected molecular mass, while amino acid analysis or peptide mapping can verify composition when the sequence itself is in question. A certificate of analysis that pairs a chromatogram with a mass spectrum is more informative than a purity figure alone. Counter-ion content and residual solvents are separate specifications and are frequently omitted.
Semax is normally supplied as a lyophilized powder, and that form is the most stable. Suppliers commonly recommend storage at -20 °C in a desiccated container protected from light, with short-term handling at room temperature limited to weighing and transfer. Powder that has absorbed moisture degrades faster, so vials should be warmed to ambient temperature before opening to prevent condensation on the contents. Hygroscopic behavior is typical of short hydrophilic peptides, and humidity control matters more than temperature alone for long-term retention.
== Experimental methods == Chemical gardens can be prepared using a variety of experimental techniques. In addition to the classical and versatile seed-growth method, scientists have developed growth in gels, injection techniques, membrane-based systems, quasi-two-dimensional Hele–Shaw cells, experiments under magnetic fields, and microgravity conditions, experiments under different gravitational fields have shown that gravity influences the growth pattern of chemical gardens, with upward growth becoming dominant above approximately 10−5 m s−2 when fluctuations are negligible, growth under an environmental scanning electron microscope, growth in gaseous acidic atmospheres to investigate the mechanisms of self-organized mineral growth.
== History == Studies conducted in the 1970s found that a series of N-formylmethionine-containing oligopeptides, including the most potent and best known member of this series, N-Formylmethionine-leucyl-phenylalanine (FMLP or fMet-Leu-Phe), stimulated rabbit and human neutrophils by an apparent receptor-dependent mechanism to migrate in a directional pattern in classical laboratory assays of chemotaxis. Since these oligopeptides were produced by bacteria or synthetic analogs of such products, it was suggested that the N-formyl oligopeptides are important chemotactic factors and their receptors are important chemotactic factor receptors that act respectively as signaling and signal-recognizing elements to initiate Inflammation responses in order to defend against bacterial invasion. Further studies cloned a receptor for these N-formyl oligopeptides, FPR1. Two receptors where thereafter discovered and named FPR2 and FPR3 based on the similarity of their genes' predicted amino acid sequence to that of FPR1 rather than on any ability to bind or be activated by the formyl oligopeptides. The latter two receptors were subsequently found to have very different specificities for the formyl oligopeptides and very different functions than those for FPR1. FPR1 is the premiere receptor for the pro-inflammatory actions of formyl peptides.
=== Immigration === In April 2022, Schmitt repeated a Great Replacement–derived claim on Glenn Beck's program that the Democratic Party seeks to "fundamentally" change the country through illegal immigration to the United States. In a September 2025 speech, Schmitt criticized both legal and illegal immigration to the United States.
Sources: en.wikipedia.org
Leucine or leucin (symbol Leu or L) is an essential amino acid that is used in the biosynthesis of proteins. Leucine is an α-amino acid, meaning it contains an α-amino group (which is in the protonated −NH3+ form under biological conditions), an α-carboxylic acid group (which is in the deprotonated −COO− form under biological conditions), and a side chain isobutyl group, making it a non-polar aliphatic amino acid. It is essential in humans (and animals), meaning the body cannot synthesize it; it must be obtained from the diet. Human dietary sources are foods that contain protein, such as meats, dairy products, soy products, and beans and other legumes. It is encoded by the codons UUA, UUG, CUU, CUC, CUA, and CUG. Leucine is named after the Greek word for 'white': λευκός (leukós 'white'), after its common appearance as a white powder, a property it shares with many other amino acids. Like valine and isoleucine, leucine is a branched-chain amino acid. The primary metabolic end products of leucine metabolism are acetyl-CoA and acetoacetate; consequently, it is one of the two exclusively ketogenic amino acids, with lysine being the other. It is the most important ketogenic amino acid in humans. Leucine and β-hydroxy β-methylbutyric acid, a minor leucine metabolite, exhibit pharmacological activity in humans and have been demonstrated to promote protein biosynthesis via the phosphorylation of the mechanistic target of rapamycin (mTOR).
=== 1.3 === DisplayPort version 1.3 was approved on 15 September 2014. This standard increases overall transmission bandwidth to 32.4 Gbit/s with the new HBR3 mode featuring 8.1 Gbit/s per lane (up from 5.4 Gbit/s with HBR2 in version 1.2), for a total data throughput of 25.92 Gbit/s after factoring in 8b/10b encoding overhead. This bandwidth is enough for a 4K UHD display (3840 × 2160) at 120 Hz with 24 bit/px RGB color, a 5K display (5120 × 2880) at 60 Hz with 30 bit/px RGB color, or an 8K UHD display (7680 × 4320) at 30 Hz with 24 bit/px RGB color. Using Multi-Stream Transport (MST), a DisplayPort port can drive two 4K UHD (3840 × 2160) displays at 60 Hz, or up to four WQXGA (2560 × 1600) displays at 60 Hz with 24 bit/px RGB color. The new standard includes mandatory Dual-mode for DVI and HDMI adapters, implementing the HDMI 2.0 standard and HDCP 2.2 content protection. The Thunderbolt 3 connection standard was originally to include DisplayPort 1.3 capability, but the final release ended up with only version 1.2 for Intel 6000 Series Thunderbolt 3 Controllers. Later Intel 7000 Series Thunderbolt 3 controllers support DisplayPort 1.4 capability including HDR. The VESA's Adaptive Sync feature in DisplayPort version 1.3 remains an optional part of the specification.
== Contraindications == Like other dihydropyridines, lercanidipine is contraindicated in unstable angina pectoris, uncontrolled cardiac failure, shortly after a myocardial infarction, and in patients with left ventricular outflow tract obstruction. It is also contraindicated during pregnancy and in women who may become pregnant, because data regarding safety for the unborn are lacking, as well as in patients with severe liver and renal impairment. The drug must not be combined with strong inhibitors of the liver enzyme CYP3A4 or with the immunosuppressant drug ciclosporin.
In 1976, a Roy Rogers in Fairfax, Virginia, was robbed, where five employees were herded into the restaurant's freezer and shot in the head. Only one survived. On August 30, 1977, Roy Rogers was struck by a cottage cheese pie thrown by a 17 year old while Rogers and his Sons of the Pioneers singers were performing at a Fairfax restaurant. The youth pleaded guilty a month later and was fined $100. In 1982, Marriott bought the Gino's restaurant chain for $48.6 million. The company converted 180 of the 313 restaurants to Roy Rogers to expand in the Baltimore/Washington area. Also in 1982, Marriott sued the Riese family, a franchisee, when they discovered the Rieses were planning to relocate a Roy Rogers restaurant with a Häagen Dazs and a Pizza Hut in Times Square. The Riese family won the suit, and the Riese Organization later developed other food courts in New York City.
Sources: en.wikipedia.org
"I am Shutruk-Nahhunte, son of Hallutush-Inshushinak, beloved servant of the god Inshushinak, king of Anshan and Susa, who has enlarged the kingdom, who takes care of the lands of Elam, the lord of the land of Elam. When the god Inshusinak gave me the order, I defeated Sippar. I took the stele of Naram-Sin and carried it off, bringing it to the land of Elam. For Inshushinak, my god, I set it as an offering."
The Court of Justice, repeating its view in Van Gend en Loos, said member states "have limited their sovereign rights, albeit within limited fields, and have thus created a body of law which binds both their nationals and themselves" on the "basis of reciprocity". EU law would not "be overridden by domestic legal provisions, however framed... without the legal basis of the community itself being called into question". This meant any "subsequent unilateral act" of the member state inapplicable. Similarly, in Amministrazione delle Finanze dello Stato v Simmenthal SpA, a company, Simmenthal SpA, claimed that a public health inspection fee under an Italian law of 1970 for importing beef from France to Italy was contrary to two Regulations from 1964 and 1968. In "accordance with the principle of the precedence of Community law", said the Court of Justice, the "directly applicable measures of the institutions" (such as the Regulations in the case) "render automatically inapplicable any conflicting provision of current national law". This was necessary to prevent a "corresponding denial" of Treaty "obligations undertaken unconditionally and irrevocably by member states", that could "imperil the very foundations of the" EU. But despite the views of the Court of Justice, the national courts of member states have not accepted the same analysis.
== Diagnosis == While heterotopic bone growth can begin spontaneously in FOP patients, Eastlack, like most patients, first experienced a triggered proliferation due to an illness or injury. When he was three or four years old, in 1937, while playing with his sister Helene, on a local street, a car hit him and injured his leg. He was taken to the hospital where his leg was put in a cast before returning home. The fracture never set properly, and when the cast was removed months later, his leg was painfully swollen with a high amount of inflammation. No further action was taken and shortly after, Eastlack began to experience his first set of abnormal bone growths. His hips and knees had become difficult to move. When he was taken to the hospital with this concern, the doctor took X-rays in which the bony deposits on his thigh muscles were revealed. The doctors were not able to diagnose his condition having seen this, and it continued to progress in the anatomically characteristic manner that FOP does. Eastlack soon suffered flare-ups along his back, neck, and chest. In attempts to diagnose and treat Eastlack's condition, the doctors ordered biopsies and performed a total of 11 surgical procedures to remove excess and heterotopic ossification, such as that on his thigh muscles. However, Eastlack's condition was aggravated by such procedures and the bone plates returned thicker and more predominant. It was 1938, the year after the incident, when he was finally diagnosed with myositis ossificans progressiva, which is now known as fibrodysplasia ossificans progressiva (FOP).
Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure (also spelled gage pressure) is the pressure relative to the ambient pressure. Various units are used to express pressure. Some of these derive from a unit of force divided by a unit of area; the SI unit of pressure, the pascal (Pa), for example, is one newton per square metre (N/m2); similarly, the pound-force per square inch (psi, symbol lbf/in2) is the traditional unit of pressure in the imperial and US customary systems. Pressure may also be expressed in terms of standard atmospheric pressure; the unit atmosphere (atm) is equal to this pressure, and the torr is defined as 1⁄760 of this. Manometric units such as the centimetre of water, millimetre of mercury, and inch of mercury are used to express pressures in terms of the height of column of a particular fluid in a manometer.
=== GGQ catalytic site === The catalytic site that is responsible for the hydrolysis of the peptidyl tRNA is the GGQ site on eRF1. Current understanding of the GGQ site states that it enters the P-site of the ribosome, which is where the peptidyl tRNA is located, after a conformational change caused by the hydrolysis of GTP by eRF3. Furthermore, any mutation to the GGQ site renders eRF1 nonfunctional, thus the cells ability to successfully terminate Translation. This is due to the two glycine residues in GGQ to adopt a torsional angle that is only possible with two glycines. Without the proper angle, the active site for the reaction won't be able to function properly. In order nascent protein to be released the GGQ site needs to recruit a water molecule into the active site of the reaction. The method of recruitment for a single water molecule is still not understood completely. Once in position, the water molecule acts as a nucleophile, and attacks the carbonyl group of the ester bond between the nascent protein and the tRNA. The hydrolysis of the ester bond causes the release of the nascent protein and the disassembly of the ribosome and termination complex.
Sources: en.wikipedia.org
Reversed-phase high-performance liquid chromatography is the standard method, with detection in the ultraviolet range. Peak area percentage yields a purity figure for the main component. Mass spectrometry is normally run alongside to confirm molecular identity.
Dry lyophilised powder is generally kept at minus twenty degrees Celsius, protected from light and moisture. Repeated freeze-thaw cycles are avoided because they encourage aggregation and moisture uptake. Solutions are less stable than the solid form and degrade faster at room temperature.
A certificate documents what the supplier measured, not what an independent party confirmed. Methods, instruments and acceptance criteria can differ between suppliers. Third-party testing is the usual way to resolve discrepancies.
It is described as a synthetic analogue of the ACTH(4–10) fragment, a short segment of adrenocorticotropic hormone. Its sequence differs from that fragment and includes two proline residues, which influence stability and behaviour in solution.