A practical reference on counterion: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2025-10-30. Anything still debated is marked as such rather than presented as settled.
Identity and purity are commonly assessed by reversed-phase high-performance liquid chromatography, with ultraviolet detection near 214 nanometers for the peptide backbone. Mass spectrometry, either electrospray or matrix-assisted laser desorption, confirms molecular mass and detects truncation or modification products. Amino acid analysis can verify composition. Because the sequence contains no strongly absorbing aromatic residue apart from phenylalanine, detection wavelengths are chosen carefully. Purity values above 95 percent are typical for research-grade material.
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.
Scientific literature on semax is unevenly distributed. A substantial share of published work originates from a small number of laboratories in Russia, while independent replication elsewhere is limited. Human data consist mostly of small trials with short follow-up, and several reported outcomes rely on subjective rating scales. Questions about how much intact peptide reaches the central nervous system after nasal administration, and how long it persists there, are still unresolved. The compound is best described as an active research subject rather than a settled pharmacological agent.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It was derived from the ACTH(4-10) fragment, a short segment of adrenocorticotropic hormone that lacks the hormonal activity associated with the full-length peptide. Researchers at the Institute of Molecular Genetics in Moscow developed the compound during the 1980s. It has been registered as a pharmaceutical product in Russia and several neighbouring countries, where it is supplied as a nasal solution, and it is also sold internationally as a research chemical.
The proposed mechanism centres on neurotrophic signalling rather than direct receptor activation. Semax is reported to increase expression of brain-derived neurotrophic factor and nerve growth factor in several brain regions, and to shift the balance between excitatory and inhibitory neurotransmitter systems. Interaction with melanocortin receptors has been suggested because of the parent ACTH fragment. Many of these findings come from rodent studies, and the extent to which they translate to human physiology remains an open question.
| Property | Value | Notes |
|---|---|---|
| Typical purity | ≥95% by HPLC | Research-grade material |
| Detection wavelength | 214 nm | Peptide bond absorbance |
| Reconstitution medium | Sterile water or saline | Prepare fresh or aliquot immediately |
| Storage (solution) | -80 °C, single-use aliquots | Avoid repeated freeze-thaw cycles |
| Common salt form | Acetate or trifluoroacetate | Affects mass and solubility |
Pharmacokinetic accounts emphasize rapid breakdown. After intravenous dosing the intact peptide disappears from blood within minutes, and nasal delivery produces low but measurable concentrations. Metabolites rather than the parent molecule may account for part of the observed activity, although the relative contribution is unresolved. Dosing in the literature varies widely and no optimal schedule has been agreed. These gaps are regularly cited as a reason the findings have not produced broad clinical adoption beyond the original research setting.
Proposed mechanisms center on neurotrophic signaling rather than on classical melanocortin receptor activation. Rodent experiments have reported shifts in the expression of brain-derived neurotrophic factor and nerve growth factor after administration, together with changes in the associated receptor systems. Several authors argue that the peptide acts largely through its degradation products and their interaction with peptidergic pathways, but this remains a hypothesis rather than a settled finding. No single molecular target has been identified in a way that the field broadly accepts.
Development is attributed to researchers at the Institute of Molecular Genetics in Moscow during the early 1980s, building on earlier Soviet work with ACTH fragments. Russian regulatory approval followed for intranasal use, and the compound has remained commercially available there for decades. Most published human data originate from Russian and, later, some Eastern European clinical reports, which are not always accessible in English translation. Outside that region the material is generally handled as a research chemical rather than a licensed medicine.
Regulatory status differs sharply between jurisdictions. In Russia the peptide is registered as a prescription nasal preparation, while agencies such as the United States Food and Drug Administration have not approved it for any indication. Products sold elsewhere are typically labeled for laboratory research only, and such labels shift responsibility for safe handling to the purchaser. Because the same name covers pharmaceutical-grade nasal drops and bulk research powder, identity and purity documentation becomes the main practical concern when comparing sources.
Semax is a synthetic seven-amino-acid peptide whose sequence extends the ACTH(4-10) fragment with a C-terminal proline-glycine-proline tripeptide. The commonly cited sequence is Met-Glu-His-Phe-Pro-Gly-Pro, giving a molecular formula near C37H51N9O10S and a molecular weight close to 813.9 g/mol. It belongs to the broader class of synthetic ACTH fragments studied for central nervous system effects rather than for adrenal steroid stimulation. In practice the material appears as a lyophilized white powder for laboratory work or as a dilute saline solution in clinical settings.
Somalia was likely one of the first lands to be settled by early humans due to its location. Hunter-gatherers who would later migrate out of Africa likely settled here before their migrations. During the Stone Age, the Doian and Hargeisan cultures flourished here. The oldest evidence of burial customs in the Horn of Africa comes from cemeteries in Somalia dating back to the 4th millennium BC. The stone implements from the Jalelo site in the north were also characterised in 1909 as important artefacts demonstrating the archaeological universality during the Paleolithic between the East and the West. According to linguists, the first Afroasiatic-speaking populations arrived in the region during the ensuing Neolithic period from the family's proposed urheimat ("original homeland") in the Nile Valley, or the Near East. The Laas Geel complex on the outskirts of Hargeisa in northwestern Somalia dates back approximately 5,000 years, and has rock art depicting both wild animals and decorated cows. Other cave paintings are found in the northern Dhambalin region, which feature one of the earliest known depictions of a hunter on horseback. The rock art is dated to 1,000 to 3,000 BC. Additionally, between the towns of Las Khorey and El Ayo in northern Somalia lies Karinhegane, the site of numerous cave paintings, which collectively have been estimated to be around 2,500 years old. The camel is believed to have been domesticated in the Horn region between the 2nd and 3rd millennium BC. From there, it spread to Egypt and the Maghreb.
=== Caged and cage-free eggs === On November 5, 2015, Panera pledged that it would use only cage-free eggs in all of its stores by 2020. Panera also announced the addition of more plant-based proteins, such as edamame and organic quinoa, to its menu. At the time of the announcement, the company said it was 21% cage-free in the roughly 70 million eggs it used in 2015. In December 2016, it published its third animal welfare progress report, announcing new efforts to improve broiler chicken welfare. In 2021, Panera announced that it had transitioned to cage-free eggs for 65% of its egg supply but not yet the remaining 35%.
Etoxeridine (Carbetidine, Atenos) is a 4-phenylpiperidine derivative that is related to the clinically used opioid analgesic drug pethidine (meperidine). Etoxeridine was developed in the 1950s and investigated for use in surgical anesthesia, however it was never commercialized and is not currently used in medicine. As with other opioids which were not in clinical use during the drafting of the Controlled Substances Act, it is categorized as a Schedule I narcotic.
Beginning in the 1970s, research was initiated to address sources of indoor radon, determinants of concentration, health effects, and mitigation approaches. In the US, the problem of indoor radon received widespread publicity and intensified investigation after a widely publicized incident in 1984. During routine monitoring at a Pennsylvania nuclear power plant, a worker was found to be contaminated with radioactivity. A high concentration of radon in his home was subsequently identified as responsible.
== Tissue distribution == CRF1 is expressed widely throughout both the central and peripheral nervous systems. In the central nervous system, CRF1 is particularly found in the cortex, cerebellum, amygdala, hippocampus, olfactory bulb, ventral tegmental area, brainstem areas, paraventricular hypothalamus, and pituitary. In the pituitary, CRF1 stimulation triggers the activation of the POMC gene, which in turn causes the release of ACTH and β-endorphins from the anterior pituitary. In the peripheral nervous system, CRF1 is expressed at low levels in a wide variety of tissues, including the skin, spleen, heart, liver, adipose tissue, placenta, ovary, testis, and adrenal gland. In CRF1 knockout mice, and mice treated with a CRF1 antagonist, there is a decrease in anxious behavior and a blunted stress response, suggesting that CRF1 mechanisms are anxiogenic. However, the effect of CRF1 appears to be regionally specific and cell-type specific, likely due to the wide variety of cascades and signaling pathways activated by the binding of CRF or CRF-agonists. In mice, offspring born to CRF1 -/- knockout mothers typically die within a few days of birth from lung dysplasia, likely due to low glucocorticoid levels. In the central nervous system, CRF1 activation mediates fear learning and consolidation in the extended amygdala, stress-related modulation of memory formation in the hippocampus, and brainstem regulation of arousal.
Sources: en.wikipedia.org
== Background == Pedro Cuatrecasas was born in Madrid, Spain on 27 September 1936. He completed his A.B. from Washington University in St. Louis in 1958. He completed his M.D. from Washington University School of Medicine in 1962. Cuatrecasas died in La Jolla, California on 19 March 2025, at the age of 88.
=== Praja Shakti Democratic Party === On 21 August 2022, Vaghela launched a new party, Praja Shakti Democratic Party, with an intention to contest 2022 Gujarat Legislative Assembly election. Later he backed the INC instead.
Peptides Leu-enkephalin Met-enkephalin Deltorphins DADLE DPDPE Non-peptides ADL-5859 BU-48 BW373U86 DPI-221 DPI-287 DPI-3290 RWJ-394674- SNC-80 TAN-67 Amoxapine (partial agonist) Cannabidiol (allosteric modulator, non-selective) Desmethylclozapine Mitragynine Mitragynine pseudoindoxyl Norbuprenorphine (peripherally restricted) N-Phenethyl-14-ethoxymetopon 7-Spiroindanyloxymorphone Tetrahydrocannabinol (allosteric modulator, non-selective) TRV250 (biased agonist) Xorphanol
Duke of Modena (Lord 1288, Duke 1452) and Reggio (nell'Emilia) (Lord 1289, Duke 1452) Duke of Ferrara (Lord 1264, Duke 1471–1597) Duke of La Mirandola (1710), Massa (1829) and Guastalla (1847) Prince of the Holy Roman Empire, Prince of Carpi (Count 1530, Prince 1535), Correggio (1635), San Martino in Rio (1752) and of Carrara (1829), Marquis of Montecchio (1597, marquessate in 1569), of Scandiano (1645) and La Concordia (1710) Count palatine of Novellara (1737) and Bagnolo (1737), Count of Jeno ed Avad (Hungary, 1726) Lord of Sassuolo (1373), San Martino in Spino (1710), Campogalliano (1752), Castellarano (1752), Rodeglia (1752), Ieno and San Cassiano
Over 500 mineral blocks are present in Jammu and Kashmir, 261 of which are in the Kashmir Division alone. Kishtwar is known as the 'land of sapphire and saffron'. Resources such as timber, herbs and medicinal shrubs, edibles such as mushroom, chilgoza, black zeera, and saffron are available in the forests. The sapphire reserve mines of Machail, Paddar are a source of mineral wealth. Jammu and Kashmir is the only administrative unit in India with a large amount of borax and sapphire resources. It possesses 36% of the graphite, 21% marble and 14% of gypsum present in India. Coal, limestone and magnesite are found scattered among the different districts of the union territory. Other minerals of significance that occur are bauxite, ball clay and china clay in Udhampur; bentonite in Jammu; diaspore in Rajouri and Udhampur; graphite in Baramulla; lignite and marble in Kupwara; quartz and silica sand in Anantnag, Doda, and Udhampur; and quartzite in Anantnag district. In addition, the Department of Geology and Mining has determined the presence of minerals such as magnetite, dolomite, fuel mineral, decorative building stones, slate, and gemstones. All are materials with commercial and industrial uses in many products and factories. In the fiscal year 2019–20, total exports from Jammu and Kashmir amounted to ₹188.18 million (equivalent to ₹240 million or US$2.5 million in 2026). The Jammu & Kashmir Bank, which is listed as a NIFTY 500 conglomerate, is based in the union territory. Jammu and Kashmir is one of the largest recipients of grants from the central government annually.
Sources: en.wikipedia.org
Solid peptide is best kept frozen at about minus 20 degrees Celsius in a sealed container with desiccant. It should be allowed to reach room temperature before opening to prevent condensation. Repeated warming and cooling of the same vial is discouraged.
Reversed-phase liquid chromatography establishes purity, while mass spectrometry confirms molecular mass. The two techniques are normally used together. Retention time alone is not sufficient evidence of identity.
Different counterions change the mass per unit of peptide and can shift chromatographic behavior. Two samples of equal stated purity may therefore not be directly comparable. Reports should specify the counterion whenever quantitative comparisons are made.
Semax is based on the ACTH(4-10) fragment, a seven-amino-acid segment of adrenocorticotropic hormone. The synthetic peptide retains the core sequence while removing regions associated with endocrine activity. This modification is intended to isolate effects on the nervous system.