counterion is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2025-09-24. Numbers and descriptions here follow the published literature rather than marketing material.
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.
Published studies are dominated by animal models of stroke, ischemia, and cognitive impairment, with a smaller number of human trials conducted in Russia. Many of the human reports are small, single-center, and published in Russian-language journals, which limits independent scrutiny. Outcome measures vary between studies and often rely on clinician-rated scales rather than objective biomarkers. Systematic reviews have noted the methodological weaknesses and called for larger, preregistered trials before firm conclusions can be drawn.
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.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It is described in the literature as an analogue of the ACTH(4–10) fragment, a short N-terminal portion of adrenocorticotropic hormone that retains some neurotropic activity without the full hormonal effects of the parent peptide. The molecule carries a methionine residue at the N-terminus and two proline residues near the C-terminus, features that shape both its interactions with receptor systems and its chemical stability. The free peptide corresponds to the formula C37H51N9O10S and a molecular mass near 813.9 Da.
| Property | Value | Notes |
|---|---|---|
| Appearance | White lyophilized powder | Typical for synthetic peptides |
| Solubility | Freely soluble in water | Also soluble in saline |
| Storage temperature | -20 C or below | Protect from repeated freeze-thaw |
| Analytical method | Reverse-phase HPLC | Confirms purity and identity |
| Common synonym | ACTH(4-10) analog | Reflects structural origin |
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.
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.
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.
=== Treatment and prevention === Treatment and prevention of periwound issues are becoming increasingly important as research continues to confirm the role of periwound in wound healing. The shared objective of treatment and prevention is maintenance and/or restoration of the integrity and healthy functionality of skin surrounding the wound. Main treatment and prevention strategies include the following:
== Achievements == In what was described by The Guardian UK as "The Toughest Job in Nigerian Healthcare," Muhammad served as Executive Director/CEO of the National Primary Health Care Development Agency (NPHCDA) from November 2011, he played a key role in Nigeria's successful eradication of polio. He established the National Polio Emergency Operations Centre in October 2012 and introduced community engagement innovations such as health camps, polio survivor groups, religious leaders, volunteer mobilizers, and child-friendly incentives. These efforts reduced wild poliovirus cases from 122 in 2012 to 53 in 2013 and six in 2014 (an 89% decline), with no new cases for over a year by mid-2015. Nigeria was removed from the polio-endemic list in September 2015, earning global praise from the WHO, Bill Gates, and partners as a model for Africa. The Emergency Operations Centre model was later adapted for epidemic responses across Africa, including during the COVID-19 pandemic for coordination, surveillance, and community engagement in Nigeria and beyond. He also strengthened routine immunization by deploying over 6,000 frontline workers, improving cold chain infrastructure, and rolling out the pentavalent vaccine nationwide to boost uptake. Additionally, he launched the "Primary Healthcare Under One Roof" initiative to consolidate services under state agencies, improving coordination and efficiency in Nigeria's federal system.
== See also == Cantonese salted fish Cured fish Salted squid Dried and salted cod Brining Gibbing Pickling salt Spekesild (cured, salted Atlantic herring) Surströmming (lightly-salted soured Baltic herring)
Type 1 diabetes (T1D), or type 1 diabetes mellitus, is an autoimmune disease that occurs when the body's immune system destroys beta cells in the pancreas that produce the hormone insulin. Insulin is used by the body to store and convert blood sugar into energy. T1D results in high blood sugar levels in the body prior to treatment due to the lack of insulin. Common symptoms include frequent urination (polyuria), increased thirst (polydipsia), increased hunger (polyphagia), weight loss, and other changes. Additional symptoms may include blurry vision, tiredness, and slow wound healing (owing to impaired blood flow). While some cases take longer, symptoms usually appear within weeks to a few months. The cause of type 1 diabetes is not completely understood, but it is believed to involve an autoimmune attack caused by a combination of genetic and environmental factors. The underlying mechanism involves an autoimmune destruction of the insulin-producing beta cells in the pancreas. Diabetes is diagnosed by testing the level of sugar or glycated hemoglobin (HbA1C) in the blood. Type 1 diabetes can be distinguished from type 2 by testing for the presence of autoantibodies and/or declining levels/absence of C-peptide. C-peptide is a product cleaved from proinsulin in the production of insulin. In type 1 diabetes its levels are low or absent. In type 2 diabetes the blood levels are high, as insulin production is high due to insulin resistance. There is currently no known way to prevent type 1 diabetes. Treatment with insulin is required for survival.
Sources: en.wikipedia.org
==== Non-selective ==== α-MSH β-MSH γ-MSH ACTH Afamelanotide Bremelanotide Melanotan II Modimelanotide Setmelanotide — MC4 receptor agonist which is FDA approved to help with chronic weight management in those with pathogenic (or uncertain) variants in POMC and certain related genes.
Grilled cold noodles (Chinese: 烤冷面; pinyin: kǎolěngmiàn) is a local specialized snack of the Chinese province of Heilongjiang. It is also used as a side dish, usually sold at night markets or roadside stands rather than in restaurant chains. Grilled cold noodles are usually cooked with noodles that somewhat resemble pieces of paper, and with eggs, onions, and other auxiliary materials, The main condiment is sweet bean sauce or gochujang. Traditionally, there are three different ways to cook the dish: grilling, teppanyaki and frying.
=== Graphene aerogel === An aerogel made of graphene layers separated by carbon nanotubes was measured at 0.16 milligrams per cubic centimeter. A solution of graphene and carbon nanotubes in a mold is freeze-dried to dehydrate the solution, leaving the aerogel. The material has superior elasticity and absorption. It can recover completely after more than 90% compression, and absorb up to 900 times its weight in oil, at a rate of 68.8 grams per second.
Sources: en.wikipedia.org
Reducible hernia: can be pushed back into the abdomen by putting manual pressure on it. Irreducible/Incarcerated hernia: cannot be pushed back into the abdomen by applying manual pressure. Irreducible hernias are further classified into
=== Pharmacodynamics === Fluoxetine is a selective serotonin reuptake inhibitor (SSRI) and does not appreciably inhibit norepinephrine and dopamine reuptake at therapeutic doses. It does, however, delay the reuptake of serotonin, resulting in serotonin persisting longer when it is released. Large doses in rats have been shown to induce a significant increase in synaptic norepinephrine and dopamine. Thus, dopamine and norepinephrine may contribute to the antidepressant action of fluoxetine in humans at supratherapeutic doses (60–80 mg). This effect may be mediated by 5HT2C receptors, which are inhibited by higher concentrations of fluoxetine. Fluoxetine increases the concentration of circulating allopregnanolone, a potent GABAA receptor positive allosteric modulator, at concentrations that are inactive on serotonin reuptake. Norfluoxetine, a primary active metabolite of fluoxetine, produces a similar effect on allopregnanolone levels in the brains of mice. Additionally, both fluoxetine and norfluoxetine are such modulators themselves, actions which may be clinically relevant. In addition, fluoxetine has been found to act as an agonist of the σ1-receptor, with a potency greater than that of citalopram but less than that of fluvoxamine. However, the significance of this property is not fully clear. Fluoxetine also functions as a channel blocker of anoctamin 1, a calcium-activated chloride channel. A number of other ion channels, including nicotinic acetylcholine receptors and 5-HT3 receptors, are also known to be inhibited at similar concentrations.
==== Estate tax, gift tax, and generation-skipping transfer tax ==== The estate, gift, and generation-skipping transfer tax exemption will increase from $13.99 million in 2025 to $15 million in 2026. The exemption amounts for subsequent years will be indexed for inflation.
=== Cuba (1800–1801) === On November 24, 1800, Humboldt and Bonpland departed the Venezuelan coast for Havana in a small vessel, enduring a perilous, storm-ridden journey of twenty-five days. Upon arrival, Havana presented a crowded and unsanitary environment, with a population of 44,000, half of whom were people of African descent. The city, nearly as large as New York due to its suburbs, was afflicted by yellow fever. The travelers were welcomed with receptions and enjoyed the hospitality of the local elite. Humboldt undertook a survey of the harbor, the principal commercial and naval base of Spanish colonial power in the Caribbean, correcting its geographic position. Humboldt and Bonpland then traveled into the Cuban interior, visiting sugar plantations, factories, and fields of indigo, tobacco, and cotton. They observed the harsh conditions under which enslaved people labored. Humboldt aimed to make an objective comparison between Cuba and South American societies.
Sources: en.wikipedia.org
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.
Peptidases degrade the compound within minutes in circulation. This short half-life is one reason nasal delivery is used, placing the substance close to the olfactory and trigeminal pathways.
No large multicenter trials have been published in English-language journals. The existing human evidence consists mainly of smaller studies conducted in Russia, which limits generalization.
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.