This is a working overview of Electrospray ionization, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-05-20. Anything still debated is marked as such rather than presented as settled.
Russian regulatory authorities approved the peptide for nasal administration, and it remains listed in the national pharmacopoeia under several trade names. Documented indications include acute ischemic stroke, transient ischemic attacks, traumatic brain injury, and certain ophthalmological and neurological conditions. Physicians also prescribe it for cognitive complaints in older patients, although the evidence base for that use is thinner. Outside Russia and a few neighboring states, the substance is not an approved medicine and is sold instead as a research chemical.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular class | Synthetic heptapeptide | Analog of an ACTH fragment |
| Amino acid length | Seven residues | Met-Glu-His-Phe-Pro-Gly-Pro |
| Origin | Moscow, 1980s | Institute of Molecular Genetics |
| Approved regions | Russia and some neighboring states | Not cleared in Western markets |
| Common trade names | Multiple national brands | Sold as a nasal formulation |
Semax 是人工设计的七肽，序列为 Met-Glu-His-Phe-Pro-Gly-Pro，骨架取自促肾上腺皮质激素片段 ACTH(4-10)。它于二十世纪八十年代在苏联的分子遗传学研究机构内合成。设计目标是保留该片段与注意力和记忆相关的活性，同时剔除促皮质激素释放等内分泌作用。此后俄罗斯将其登记为药品并进入临床使用。
当时的短肽研究普遍关注能否穿越血脑屏障、在低剂量下产生中枢效应，Semax 属于这一路线。鼻内给药是其主要使用方式，俄语文献报道的适应症涵盖缺血性卒中、短暂性脑缺血发作、认知功能减退以及视神经病变。这些研究大多发表在当地期刊上，样本规模与终点设置同西方试验惯例存在差异，国际同行对其临床证据的强度看法不一。
各国监管态度分化明显。俄罗斯按处方药管理，部分东欧国家留有使用记录；欧盟与美国未批准其作为药物上市，市面流通品通常标注为研究用化学品。身份差异意味着标示含量、纯度与无菌性缺少统一核查。体育领域还牵涉反兴奋剂名录，跨境携带则受目的地药品法规约束。
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.
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。
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。
Survival of motor neuron or survival motor neuron (SMN) is a protein that in humans is encoded by the SMN1 and SMN2 genes. SMN is found in the cytoplasm of all animal cells and also in the nuclear gems. It functions in transcriptional regulation, telomerase regeneration and cellular trafficking. SMN deficiency, primarily due to mutations in SMN1, results in widespread splicing defects, especially in spinal motor neurons, and is one cause of spinal muscular atrophy. Research also showed a possible role of SMN in neuronal migration and/or differentiation.
== Taxonomy and naming == Eucalyptus globulus was first formally described in 1800 by the French botanist Jacques Labillardière in his book, Relation du Voyage à la Recherche de la Pérouse. Labillardière collected specimens at Recherche Bay during the d'Entrecasteaux expedition in 1792. The d'Entrecasteaux expedition made immediate use of the species when they discovered it, the timber being used to improve their oared boats. The Tasmanian blue gum was proclaimed as the floral emblem of Tasmania on 27 November 1962. The species name is from the Latin globulus, a little ball or small sphere, referring to the shape of the fruit. In 1974, James Barrie Kirkpatrick described four subspecies and the names have been accepted by the Australian Plant Census. Each subspecies has a characteristic arrangement of its flower buds:
==== As defendant ==== Monster Energy has occasionally been on the other side of copyright infringement lawsuits. For example, in August 2012, the Beastie Boys filed a lawsuit against the company for copyright infringement over Monster's use of their music played by Z-Trip in an online campaign. In 2014, a jury found Monster Beverage Corporation had infringed on Beastie Boys' copyright by using songs without permission, and owed the group $1.7 million.
Sources: en.wikipedia.org
=== Nomenclatures === The dextrorotary (+)- or d- enantiomer is (1S,2S)-pseudoephedrine, whereas the levorotatory (−)- or l- form is (1R,2R)-pseudoephedrine. In the outdated d-/l- system, (+)-pseudoephedrine is also referred to as l-pseudoephedrine and (−)-pseudoephedrine as d-pseudoephedrine (in the Fischer projection, the phenyl ring is drawn at the bottom). Often the d-/l- system (with small caps) and the d-/l- system (with lower-case) are confused. The result is that the dextrorotatory d-pseudoephedrine is wrongly named d-pseudoephedrine and the levorotatory l-pseudoephedrine (the diastereomer) wrongly l-pseudoephedrine. The IUPAC names of the two enantiomers are (1S,2S)- and (1R,2R)- 2-methylamino-1-phenylpropan-1-ol, for the dextrorotatory and levorotatory enantiomers respectively. Synonyms for both are psi-ephedrine and threo-ephedrine. Pseudoephedrine is the INNTooltip International Nonproprietary Name of the (+)-/dextrorotatory form, when used as a pharmaceutical substance.
The Windscale fire brought the need for testing of the land downwind for radioactive material contamination, and this is how it was found. An estimate of 8.8 terabecquerels (240 Ci) of polonium-210 has been made. It has also been suggested that Irène Joliot-Curie's 1956 death from leukaemia was owed to the radiation effects of polonium. She was accidentally exposed in 1946 when a sealed capsule of the element exploded on her laboratory bench. As well, several deaths in Israel during 1957–1969 have been alleged to have resulted from 210Po exposure. A leak was discovered at a Weizmann Institute laboratory in 1957. Traces of 210Po were found on the hands of Professor Dror Sadeh, a physicist who researched radioactive materials. Medical tests indicated no harm, but the tests did not include bone marrow. Sadeh, one of his students, and two colleagues died from various cancers over the subsequent few years. The issue was investigated secretly, but there was never any formal admission of a connection between the leak and the deaths. The Church Rock uranium mill spill 16 July 1979 is reported to have released polonium-210. The report states animals had higher concentrations of lead-210, polonium-210 and radium-226 than the tissues from control animals.
== Function == This gene encodes adenylate cyclase-activating polypeptide 1. Mediated by adenylate cyclase-activating polypeptide 1 receptors, this polypeptide stimulates adenylate cyclase and subsequently increases the cAMP level in target cells. Adenylate cyclase-activating polypeptide 1 is not only a hypophysiotropic hormone (i.e. a substance that induces activity in the hypophysis), but also functions as a neurotransmitter and neuromodulator. In addition, it plays a role in paracrine and autocrine regulation of certain types of cells. This gene has five exons. Exons 1 and 2 encode the 5' UTR and signal peptide, respectively; exon 4 encodes an adenylate cyclase-activating polypeptide 1-related peptide; and exon 5 encodes the mature peptide and 3' UTR. This gene encodes three different mature peptides, including two isotypes: a shorter form and a longer form. A version of this gene has been associated with post-traumatic stress disorder (PTSD) in women (but not men). This disorder involves a maladaptive psychological response to traumatic, i.e. existence-threatening, events. Ressler et al. identified an association of a SNP in the gene coding for pituitary adenylate cyclase-activating polypeptide (PACAP), implicating this peptide and its receptor (PAC1) in PTSD. In mouse model of heavy alcohol drinking, PACAP seems to mediate alcohol effects on bed nucleus of the stria terminalis.
Sources: en.wikipedia.org
Sports nutrition is the study and practice of nutrition and diet for maintaining and improving athletic performance. Nutrition is part of many sports training regimens, being used in strength sports (such as weightlifting and bodybuilding) and endurance sports (e.g., cycling, running, swimming, rowing). Sports nutrition focuses on the type, as well as the quantity, of fluids and food taken by an athlete. It deals with consuming nutrients, such as vitamins, minerals, carbohydrates, proteins, and fats.
As a result of tight advertising and marketing prohibitions, tobacco companies view packaging as a vital factor in displaying brand imagery and creating in-store presence at the point of purchase. Market testing shows the influence of this dimension in shifting the consumer's choice when the same product is displayed in alternative packaging. Companies have manipulated a variety of elements on packaging designs to communicate the impression of lower tar content or milder cigarettes, although the actual contents were the same. Some countries require cigarette packs to display warnings about the health impact of smoking. The United States was the first, later followed by other countries including Canada, most of Europe, the United Kingdom, Australia, Pakistan, India and Hong Kong. In 1985, Iceland became the first country to enforce graphic warnings on cigarette packaging. At the end of December 2010, new regulations in Canada increased the size of tobacco warnings to cover three-quarters of cigarette packaging. As of November 2010, 39 countries have adopted similar legislation. In February 2011, the Canadian government passed regulations requiring cigarette packaging to contain 12 new images to cover three quarters of the outside panel and eight new health messages on the inside panel with full color. As of April 2011, Australian regulations require all packaging to use a bland olive green that researchers determined to be the least attractive color, with 75% coverage on the front of the pack and all of the back consisting of graphic health warnings.
According to these rules, compounds with the most ionic character will have large positive ions with a low charge, bonded to a small negative ion with a high charge. More generally HSAB theory can be applied, whereby the compounds with the most ionic character are those consisting of hard acids and hard bases: small, highly charged ions with a high difference in electronegativities between the anion and cation. This difference in electronegativities means that the charge separation, and resulting dipole moment, is maintained even when the ions are in contact (the excess electrons on the anions are not transferred or polarized to neutralize the cations). Although chemists classify idealized bond types as being ionic or covalent, the existence of additional types such as hydrogen bonds and metallic bonds, for example, has led some philosophers of science to suggest that alternative approaches to understanding bonding are required. This could be by applying quantum mechanics to calculate binding energies.
On 4–11 February 1945 leaders from the United States, the United Kingdom, and the Soviet Union held the Yalta Conference where future arrangements regarding post-war Europe and Allied strategy against Japan in the Pacific were negotiated. They agreed that the boundaries of Germany as at 31 December 1937 would be chosen as demarcating German national territory from German-occupied territory; all German annexations after 1937 were automatically null. Subsequently, and into the 1970s, the West German state was to maintain that these 1937 boundaries continued to be 'valid in international law', although the Allies had already agreed amongst themselves that the territories east of the Oder–Neisse line must be transferred to Poland and the Soviet Union in any peace agreement. The conference agreed that post-war Germany, minus these transfers, would be divided into four occupation zones: a French Zone in the far west; a British Zone in the northwest; an American Zone in the south; and a Soviet Zone in the East. Berlin was separately divided into four zones. These divisions were not intended to dismember Germany, only to designate zones of administration.
Sources: en.wikipedia.org
It originated at the Institute of Molecular Genetics in Moscow during the 1980s. The work was carried out by a Russian research group that specialized in peptide neuropharmacology.
It is registered as a medicine in Russia and has been used clinically there for decades. No regulatory agency in Western Europe or North America has approved it for any indication.
Semax corresponds to the four-to-ten fragment of adrenocorticotropic hormone. Because it omits the first three residues, it lacks the adrenal-stimulating action of the full hormone.
Suppliers normally quote a percentage of total chromatographic peak area, most often from reversed-phase HPLC. That figure says nothing about what the remaining percentage contains, and it depends on the detection wavelength used. A mass spectrometry result is a separate and stronger check on identity.