Everything below concerns mass spectrometry. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2025-08-23. Numbers and descriptions here follow the published literature rather than marketing material.
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.
Once dissolved, the peptide is considerably less stable than the solid. Aqueous solutions are usually prepared at neutral to slightly acidic pH, filtered, and divided into single-use aliquots before freezing. Repeated freeze-thaw cycles are a common cause of avoidable loss and are best prevented by never refreezing a thawed aliquot. Adsorption to plastic and glass surfaces can lower the measured concentration of dilute solutions, particularly below roughly 0.1 mg/mL. Buffer choice, salt content, and container material all influence how much peptide remains detectable after storage.
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.
从分子层面看，Semax 是线性七肽，没有二硫键、糖基或脂链修饰，N 端为游离氨基，C 端为游离羧基。分子含组氨酸与谷氨酸侧链，因此在水和甲醇等极性溶剂中溶解良好，在非极性溶剂中溶解有限。计算分子量约为 814 Da，与其质子化离子的质荷比吻合，可用于质谱确认。
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 |
|---|---|---|
| Solid storage temperature | -20 °C or below | Desiccated and protected from light |
| Solution storage temperature | -80 °C as single-use aliquots | Avoid repeated freeze-thaw cycles |
| Purity assessment method | RP-HPLC, around 214 nm | Reported as main-peak area percent |
| Identity confirmation method | ESI-MS or MALDI-TOF | Measured mass compared with calculated mass |
| Common synonyms | ACTH(4-10) analog; Met-Glu-His-Phe-Pro-Gly-Pro | Also written as Semaxum in some sources |
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.
Both Tarabella and Cozzolino were arrested on charges of corruption, money-laundering and participation in a criminal organization under arrest warrants issued on 10 February 2023. In July 2023, investigators additionally searched the offices of Belgian MEP Marie Arena. They discovered €280,000 in cash in the apartment of her son, Ugo Lemaire, which is located next to Arena's own flat. These raids occurred after the investigating judge, Michel Claise, recused himself from the case, as his son is a business partner of Ugo Lemaire in a Cannabis business, BRC & Co.
Watch manufacture was becoming streamlined; the Japy family of Schaffhausen, Switzerland, led the way in this, and soon afterwards the newborn American watch industry developed much new machinery, so that by 1865 the American Watch Company (afterwards known as Waltham) could turn out more than 50,000 reliable watches each year. This development drove the Swiss out of their dominating position at the cheaper end of the market, compelling them to raise the quality of their products and establish themselves as the leaders in precision and accuracy instead.
=== Italy === The 2013 Italian general election led to a major change in the country's political landscape, as the traditional center-right and center-left parties were challenged by the new Five Star Movement, a populist party led by comedian Beppe Grillo. None of the three main alliances – the centre-right led by Silvio Berlusconi, the centre-left led by Pier Luigi Bersani and the Five Star Movement – won an outright majority in Parliament. After a failed attempt to form a government by Bersani, then-secretary of the Democratic Party (PD), and Giorgio Napolitano's re-election as President, Enrico Letta, Bersani's deputy, received the task of forming a grand coalition government. The Letta Cabinet consisted of the PD, Berlusconi's The People of Freedom (PdL), Civic Choice (SC), the Union of the Centre (UdC) and others. Following the election of Matteo Renzi as Secretary of the PD in December 2013, there were persistent tensions culminating in Letta's resignation as prime minister in February 2014. Subsequently, Renzi formed a government based on the same coalition (including the NCD), but in a new fashion. The new prime minister had a strong mandate from his party and was reinforced by the PD's strong showing in the 2014 European Parliament election and the election of Sergio Mattarella, a fellow Democrat, as president in 2015.
Sources: en.wikipedia.org
==== Internationals that emerged from the International Committee of the Fourth International (ICFI) ==== International Committee of the Fourth International (WRP), ICFI (1953) International Communist League (Fourth Internationalist), ICL-FI) (1974) previously the international Spartacist tendency which split from the ICFI. International Bolshevik Tendency, IBT (1982) formed by expelled members of the international Spartacist tendency. International Trotskyist Committee, ITC (1984), founded by former members of the defunct Trotskyist International Liaison Committee. The latter was founded by expelled members of the ICFI in 1974. International Committee of the Fourth International (SEP), ICFI (1985) League for the Fourth International, LFI (1998). Organising Committee for the Reconstitution of the Fourth International, OCRFI (2016) Bolshevik Tendency, (2018) split from IBT. Liaison Committee for the Fourth International, founded by former members of the ITC.
The two substrates of this enzyme are myo-inositol and oxidised nicotinamide adenine dinucleotide (NAD+). Its products are 2,4,6/3,5-pentahydroxycyclohexanone, reduced NADH, and a proton. This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is myo-inositol:NAD+ 2-oxidoreductase. Other names in common use include myo-inositol 2-dehydrogenase, myo-inositol:NAD+ oxidoreductase, inositol dehydrogenase, and myo-inositol dehydrogenase. This enzyme participates in inositol metabolism and inositol phosphate metabolism.
==== Knight Grand Cross of the Order of St Michael and St George (GCMG) ==== Diplomatic Service and Overseas List Sir (Arthur) John Coles, , Permanent Under-Secretary of State, Foreign and Commonwealth Office.
"[Nar]am-Sin, the mighty, <Lacuna> ..., Sidu[r-x] (and) the highlanders of Lullubum assembled together ... bat[tle]. For/to <Lacuna> the high[landers ...] <Lacuna> [heap]ed up [a burial mound over them], ... (and) dedicated (this object) [to the god ...] <Lacuna> Shutruk-Nahhunte added his own inscription to the stele, in Middle Elamite:
Sources: en.wikipedia.org
==== Traumatic calcinosis cutis ==== Traumatic calcinosis cutis is a cutaneous condition characterized by calcification of the skin resulting from the deposition of calcium and phosphorus often resulting from occupational exposure, as in cases reported in oil-field workers and coal miners.
== Awards and honours == 2007: Foreign associate of the National Academy of Sciences of the United States 2007: Robert Koch Gold Medal 1998: Fellow of the Academy of Medical Sciences (FMedSci). 1973: Elected Fellow of the Royal Society
The only feature that differentiates one brand from another is the product name in a standard color, position, font size, and style. In response to these regulations, Philip Morris International, Japan Tobacco Inc., British American Tobacco Plc., and Imperial Tobacco attempted to sue the Australian government. On August 15, 2012, the High Court of Australia dismissed the suit and made Australia the first country to introduce brand-free plain cigarette packaging with health warnings covering 90% of the back and 70% of the front packaging. This took effect on December 1, 2012. Similar policies have since been introduced in the United Kingdom, where standardised packaging of tobacco products regulations (SPOT) were introduced in 2015. These regulations were also challenged by cigarette manufacturers.
If SO3 is condensed above 27 °C, then α-SO3 forms, which has a melting point of 62.3 °C. α-SO3 is fibrous in appearance. Structurally, it is the polymer [S(=O)2(μ-O)]n. Each end of the polymer is terminated with OH groups. β-SO3, like the alpha form, is fibrous but of different molecular weight, consisting of a hydroxyl-capped polymer, but melts at 32.5 °C. Both the gamma and the beta forms are metastable, eventually converting to the stable alpha form if left standing for sufficient time. This conversion is caused by traces of water. Relative vapor pressures of solid SO3 are alpha < beta < gamma at identical temperatures, indicative of their relative molecular weights. Liquid sulfur trioxide has a vapor pressure consistent with the gamma form. Thus heating a crystal of α-SO3 to its melting point results in a sudden increase in vapor pressure, which can be forceful enough to shatter a glass vessel in which it is heated. This effect is known as the "alpha explosion".
==== Efp ==== Efp, or estrogen-inducible RING-finger protein, is an E3 ubiquitin ligase whose overexpression has been shown to be the major cause of estrogen-independent breast cancer. Efp's substrate is 14-3-3 protein which negatively regulates cell cycle.
Sources: en.wikipedia.org
Each freeze-thaw cycle can degrade a fraction of the peptide and promote aggregation. Dividing a stock solution into single-use volumes removes repeated cycling as a variable. It also limits the time a thawed solution spends at room temperature.
A high main-peak percentage says little about identity, counter-ion content, or residual solvents. It also does not distinguish an isomer or a closely eluting analog. Mass confirmation and the accompanying documentation cover those gaps.
Salt form changes mass, solubility, and hygroscopicity, and acetate and trifluoroacetate salts behave differently in solution. Storage guidance still centers on -20 °C for powder and lower temperatures for solutions. The certificate should state which salt is present.
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。