A practical reference on counterion: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2025-11-10 and is reviewed periodically as new material appears.
Regulatory status varies sharply by country. Semax is registered for medical use in Russia, where it appears in formularies as a nasal solution, and it also holds registration in a small number of neighbouring states. It has no approval from the United States Food and Drug Administration or the European Medicines Agency, and it is not a scheduled controlled substance in most jurisdictions. Elsewhere it circulates mainly as laboratory material, so purity documentation comes from suppliers rather than from a national pharmacopoeia.
Semax is a synthetic peptide created in the Soviet Union during the early 1980s by researchers working in Moscow. It was built from the short adrenocorticotropic hormone fragment known as ACTH(4-10), and the chain was then extended with three additional amino acids. The resulting molecule was named semax and entered clinical use in Russia in 1994. It is generally described as a nootropic and neuroprotective agent rather than as a hormone analogue.
Claims about enhanced focus, memory, or mood in healthy people rest mostly on anecdotal reports and community discussion rather than on controlled data. It remains unclear whether any cognitive benefit observed in patients recovering from brain injury would extend to uninjured users. Dose-response relationships, long-term safety, and interactions with other drugs are not well characterized in the peer-reviewed literature. Questions about optimal route of administration and treatment duration likewise remain open.
Semax binds to melanocortin receptors and is thought to influence neuronal survival and plasticity rather than to act through the adrenal axis. Laboratory work has shown increased expression of brain-derived neurotrophic factor and nerve growth factor in treated tissue. Changes in c-Fos, a marker of neuronal activation, have also been reported. Because the peptide is rapidly degraded by peptidases, its effects are generally attributed to downstream signaling cascades rather than to sustained receptor occupancy.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic heptapeptide | Analogue of the ACTH(4-10) fragment |
| Amino acid sequence | Met-Glu-His-Phe-Pro-Gly-Pro | Single-letter form MEHFPGP |
| Molecular formula | C37H51N9O10S | Free peptide, nominal mass near 814 Da |
| First registration | 1994, Russia | Nasal formulation for neurological indications |
| Typical purity grade | 95% or higher by HPLC | Research material; higher grades used as reference standards |
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。
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。
Quality documentation for research-grade peptide usually includes a certificate of analysis stating purity, identity, and residual counterion content. Batch-to-batch variation in purity and salt form is a recognized issue, and comparisons across suppliers require attention to the exact counterion, for example acetate versus trifluoroacetate. Sequence verification by tandem mass spectrometry provides stronger evidence than a single mass measurement. For any study reporting biological results, the analytical method and the measured purity should be stated explicitly. Independent verification of supplier claims is considered good practice.
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.
The compound was developed during the 1980s at the Institute of Molecular Genetics in Moscow as part of research on fragments of adrenocorticotropic hormone. Early work examined short ACTH-derived sequences that retained neurotrophic effects while lacking the endocrine activity of the full hormone. Semax entered clinical use in Russia during the 1990s, where it received registration for several neurological indications. Outside that region it remained primarily a laboratory research material rather than an approved therapeutic. English-language literature on it grew more slowly and frequently cited the original Russian studies.
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.
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.
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.
Ivory is a hard, white material from the tusks (traditionally from elephants) and teeth of animals, that consists mainly of dentin, one of the physical structures of teeth and tusks. The chemical structure of the teeth and tusks of mammals is the same, regardless of the species of origin, but ivory contains structures of mineralised collagen. The trade in certain teeth and tusks other than elephant is well established and widespread; therefore, "ivory" can correctly be used to describe any mammalian teeth or tusks of commercial interest which are large enough to be carved or scrimshawed. Besides natural ivory, ivory can also be produced synthetically, hence (unlike natural ivory) not requiring the retrieval of the material from animals. Tagua nuts can also be carved like ivory. The trade of finished goods of ivory products has its origins in the Indus Valley. Ivory is a main product that is seen in abundance and was used for trading in Harappan civilization. Finished ivory products that were seen in Harappan sites include kohl sticks, pins, awls, hooks, toggles, combs, game pieces, dice, inlay and other personal ornaments. Ivory has been valued since ancient times in art or manufacturing for making a range of items from ivory carvings to false teeth, piano keys, fans, and dominoes. Elephant ivory is the most important source, but ivory from mammoth, walrus, hippopotamus, sperm whale, orca, narwhal and warthog is used as well. Elk also have two ivory teeth, which are believed to be the remnants of tusks from their ancestors.
== Prevention of neonatal infection == The only reliable way to prevent EOD currently is intrapartum antibiotic prophylaxis (IAP), that is to say, the administration of antibiotics during delivery. It has been proved that intravenous penicillin or ampicillin administered for at least 4 hours before delivery to GBS colonized women is very effective at preventing vertical transmission of GBS from mother to baby and EOD. Intravenous penicillin remains the agent of choice for IAP, with intravenous ampicillin as an acceptable alternative. For penicillin-allergic women, the laboratory requisitions for ordering antepartum GBS screening cultures should indicate clearly the presence of penicillin allergy. Cefazolin, clindamycin, and vancomycin are used to prevent EOD in infants born to penicillin-allergic mothers. Intravenous vancomycin is recommended for IAP in women colonized with a clindamycin-resistant Group B Streptococcus strain and a severe penicillin allergy. There are two ways to identify female candidates to receive intrapartum antibiotic prophylaxis: a risk-based approach or a culture-based screening approach. The culture-based screening approach identifies candidates to receive IAP using lower vaginal and rectal cultures obtained between 36 and 37 weeks' gestation (32–34 weeks of gestation for women with twins) and IAP is administered to all GBS colonized women. The risk-based strategy identifies candidates to receive IAP by the aforementioned risk factors known to increase the probability of EOD without considering if the mother is or is not a GBS carrier.
After receiving a missile targeting device disguised as a gem from Agent Abrella, she travels to Earth in the Kaijuki Devil Capture 5 (デビルキャプチャー5, Debiru Kyapuchā Faibu), which is destroyed by Deka Bike Robo while she is captured by S.P.D.'s Earth unit. She escapes to rekindle a former relationship, but is confronted by the Dekarangers and learns of Abrella's true intentions. Once the Dekarangers stop the missile and jettison Faraway to safety, she is pardoned. Faraway is portrayed by Aja (あじゃ). Tokasaian Princess Io Yonmerluicchi (トカーサ星人イオ・ヨンマールイッチ, Tokāsa Seijin Io Yonmāruitchi): A princess from Planet Tokasa who resembles Umeko. Io Yonmerluicchi is portrayed by Mika Kikuchi, who also portrays Umeko. Chanbenarian Gin (チャンベーナ星人ギン, Chanbēna Seijin Gin): A feline alien child from Planet Chanbenar who tries to steal medicine from Hakutaku, for his sick mother, after he was unable to buy it with a pearl he found, but is stopped and befriended by Sen-chan. After surviving an attempt on his life by an Alienizer named Gineka, who used the pearl in his Kaijuki game, Gin's mother receives medicine from Hakutaku at Sen-chan's request. Gin is voiced by Yōko Teppōzuka (鉄炮塚 葉子, Teppōzuka Yōko). Teranian Chou San (テラン星人チョウ・サン, Teran Seijin Chō San): A retired veteran detective from Planet Teran who seeks revenge on an Alienizer named Raja Namunan for killing his daughter 13 years prior, but was never able to prove it. In the present, Jasmine shows him the errors of his ways while confirming his theory. Chou San is voiced by Seizō Katō (加藤 精三, Katō Seizō).
Communication was hampered by the diversity of indigenous languages, and the travelers relied on sign language and the limited information provided by missionaries. At the Mission of Javita, they organized an overland portage of their canoe to the Pimichin, which connected them to the Rio Negro. This portage required several days and the labor of over twenty Natives. Upon reaching the Pimichin and then the Rio Negro, the expedition entered a new phase of their journey. They encountered clear “black-water” rivers, a contrast to the muddy white waters of the Orinoco, and observed changes in vegetation and animal life. Food supplies remained scarce, and insects continued to be a challenge. The expedition reached San Carlos, a military post on the Brazil-Venezuela border, on 7 May. Humboldt considered continuing to the Atlantic via the Amazon but abandoned this idea. Portuguese authorities in Brazil had issued a warrant for his arrest, suspecting him of espionage and subversion. After three days, the expedition departed San Carlos, beginning the return to Venezuela via the Casiquiare canal. On 10 May, the party entered the Casiquiare, a waterway many European geographers still doubted existed. Insects swarmed, especially the tiny jejen. Humboldt paused at San Francisco Solano mission to take astronomical readings and acquire two birds from local Natives, expanding his collection of animals.
=== Ischemic stroke === Some preliminary research suggested that citicoline may reduce the rates of death and disability following an ischemic stroke. However, the largest citicoline clinical trial to date (a randomised, placebo-controlled, sequential trial of 2,298 patients with moderate-to-severe acute ischaemic stroke in Europe), found no benefit of administering citicoline on survival or recovery from stroke. A meta-analysis of seven trials reported no statistically significant benefit for long-term survival or recovery.
Sources: en.wikipedia.org
=== FDA Warning for illegal marketing === On April 17, 2017, LifeVantage was issued a warning letter by the U.S. Food and Drug Administration (FDA) regarding illegal advertising claims on the company's websites suggesting that Protandim can play a role in helping to cure various ailments, including cancer and diabetes. The claims were deemed to be in violation of Section 201(g)(1)(B) of the Federal Food, Drug, and Cosmetic Act [21 U.S.C. § 321(g)(1)(B)].
== Mode of action == When used as a food additive, ractopamine added to feed can be distributed by the blood to the muscle tissues, where it serves as a full agonist to murine (mouse or rat) TAAR1, a receptor protein (not necessarily in humans). It is also an agonist to beta-adrenergic receptors and a dopamine releasing agent. A cascade of events will then be initiated to increase protein synthesis, which results in increased muscle fiber size. Ractopamine is known to increase the rate of weight gain, improve feed efficiency, and increase carcass leanness in finishing swine. Its use in finishing swine yields about 3 kg (6.6 lb) of additional lean pork per animal, and improves feed efficiency by 10%. In cattle on 28 January 2004 Elanco Animal Health made Optaflexx commercially available in the US. Optaflexx is a "medicated feed additive that is labeled only for use in steers or market heifers (not breeding heifers or bulls) during the last 28–42 days on feed."
Ukrainian President Volodymyr Zelenskyy claimed that air defences had shot down some thirty six Shahed drones. In occupied Crimea, the regional governor said six Ukrainian drones were shot down. In an interview with Die Welt, Vadym Skibitsky, deputy head of Ukraine's military intelligence service, said the government intends to assassinate Putin "because he coordinates and decides what happens" in the war. Yevgeny Prigozhin announced the start of the turnover of Bakhmut from his Wagner mercenaries to the Russian military and his forces' withdrawal from the city. He also said they would repatriate the bodies of an American national, whom he identified as a former special forces soldier named Nicholas Maimer, and a Turkish citizen, which they claimed to have recovered from the remains of a building blown up by Ukrainian forces, adding that the body of another Turkish national, a woman, was also found but could not be retrieved. 106 Ukrainian POWs captured in Bakhmut were repatriated to Ukraine in a prisoner exchange with Russia. The FSB announced that it had arrested two members of a Ukrainian "sabotage group" and two Russian accomplices who were plotting to bomb power lines connected to the Leningrad and Kalinin Nuclear Power Plants, adding that 36.5 kilos of explosives and about 60 detonators were recovered from them. The Russian Defence Ministry said it had scrambled Su-27 and Su-35 fighter jets to intercept two US Air Force B-1B strategic bombers near the country's airspace boundary over the Baltic Sea.
In Ethiopia and Zambia, elaborate scarification is often done on women at puberty, used to denote a willingness to be a mother. The markings show that she can stand the pain of childbirth, as well as being an indication of her emotional maturity.
Sources: en.wikipedia.org
Registered medical products are most often 0.1% nasal drops. Research suppliers ship lyophilized powder, usually in milligram quantities, which is dissolved before use. The active peptide is the same in both cases; presentation and excipients differ.
No. The peptide is synthetic, although it is modelled on a fragment of a naturally occurring hormone. ACTH(4-10) is generated when ACTH is cleaved, but the Pro-Gly-Pro extension is not a known endogenous sequence. It is therefore a designed analogue rather than a natural metabolite.
The label reflects reported effects on attention, memory and recovery after neurological injury in regional clinical reports. Those reports are mostly small and have not been widely replicated outside the region. The classification is descriptive and does not imply a single defined mechanism.
It is associated with the melanocortin receptor family, particularly subtypes found in the central nervous system. This interaction is separate from the adrenal pathway activated by full-length ACTH.