Everything below concerns lyophilization. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-07-04. Where a claim depends on a specific study, the study is described rather than over-claimed.
Routine characterization relies on reversed-phase high-performance liquid chromatography to establish purity and on mass spectrometry to confirm molecular identity. Electrospray ionization and matrix-assisted laser desorption ionization are both used for mass verification. Amino acid analysis and peptide mapping can detect sequence errors. Common impurities include truncated sequences, methionine sulfoxide formed by oxidation, and deamidated products. Chromatograms are usually recorded near 214 nm, where the peptide backbone absorbs, and purity is reported as the percentage area of the principal peak.
Verification of a supplied batch generally combines a certificate of analysis with independent testing, because certificates are self-reported documents. A typical package includes a chromatographic trace, a mass spectrum, and a stated water or counter-ion content. Batch-to-batch consistency matters more than a single purity figure when results are compared across experiments. No single mandatory standard governs research-grade peptide release, so laboratories are expected to define their own acceptance criteria. Residual trifluoroacetate from purification is a frequently overlooked counter-ion.
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.
| Property | Value | Notes |
|---|---|---|
| Typical purity | 95% or higher | By reversed-phase HPLC area |
| Identity method | Electrospray mass spectrometry | Confirms molecular mass |
| Purity method | Reversed-phase HPLC | Detection near 214 nm |
| Primary degradation | Methionine oxidation | Sulfoxide product, +16 Da |
| Solution storage | 2-8 °C, short term | Aliquot to avoid freeze-thaw |
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.
The C-terminal Pro-Gly-Pro extension is not incidental. Proline-rich tails are known to resist several common peptidases, and the published literature attributes the longer half-life of Semax, relative to unmodified ACTH fragments, to this feature. The modification also removes the melanocyte-stimulating and corticosteroidogenic activity that characterizes longer ACTH-derived sequences. Because the molecule is small and hydrophilic, it is typically formulated as an aqueous solution for intranasal or parenteral delivery. Acetylation or amidation at the termini appears in closely related research peptides and shifts the mass by a fixed increment.
Reported pharmacological work centers on neurotrophic signaling, including changes in BDNF and NGF expression in hippocampal tissue in animal models. Human data come largely from studies conducted in Russia, and how well those results generalize to other populations remains an open question. Regulatory status differs sharply by jurisdiction: Semax is a registered prescription medicine in Russia, while it holds no approved marketing status in the United States or the European Union. Outside such jurisdictions it is generally handled as a research chemical, which affects both documentation and quality expectations.
Semax is a synthetic heptapeptide whose sequence is Met-Glu-His-Phe-Pro-Gly-Pro. It was developed as a fragment analog of adrenocorticotropic hormone, modeled specifically on the ACTH(4-10) region. The first four residues reproduce that fragment, while a Pro-Gly-Pro tripeptide is appended at the C-terminus. Work on the compound originated in Russia, where it entered clinical use as an intranasal preparation. Its sequence places it among short regulatory peptides studied for effects on the central nervous system rather than on the adrenal axis.
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.
=== Netball === 10 September - Netball New Zealand suspends the Silver Ferns' coach Dame Noeline Taurua over concerns over her management style and bullying allegations. 25 October – Following an internal investigation and protracted negotiations, Netball New Zealand reinstates Dame Taurua as the Silver Ferns' coach, effective late 2025.
Supplementary motor area A region of the medial frontal cortex involved in the planning and coordination of complex, internally generated movements. The SMA contributes to motor sequence initiation, bimanual coordination, and motor imagery. Synapse The junction between two neurons (or between a neuron and another cell) where information is transmitted via neurotransmitters or electrical signals. Synaptic cleft The small space between the presynaptic and postsynaptic neurons across which neurotransmitters are released. Synaptic plasticity The ability of synapses to strengthen or weaken over time, based on activity levels. It underlies learning and memory. Synaptogenesis The formation of new synapses between neurons. It occurs extensively during development and continues throughout life in certain brain regions. Synaptopathy A disorder of synaptic function, often implicated in neurodevelopmental and neurodegenerative diseases such as autism and Alzheimer’s disease. Syringomyelia A condition in which a cyst forms within the spinal cord, potentially damaging nerve fibers and leading to pain, weakness, and sensory loss.
In the north, either a single new state consisting of Schleswig-Holstein, Hamburg, Bremen and Lower Saxony should be created (solution A) or two new states, one in the northeast consisting of Schleswig-Holstein, Hamburg and the northern part of Lower Saxony (from Cuxhaven to Lüchow-Dannenberg) and one in the northwest consisting of Bremen and the rest of Lower Saxony (solution B). In the center and southwest, one alternative was that Rhineland-Palatinate (with the exception of the Germersheim district but including the Rhine-Neckar region) should be merged with Hesse and the Saarland (solution C), the district of Germersheim would then become part of Baden-Württemberg. The other alternative was that the Palatinate (including the region of Worms) could be merged with the Saarland and Baden-Württemberg, and the rest of Rhineland-Palatinate would then merge with Hesse (solution D). Both alternatives could be combined (AC, BC, AD, BD). At the same time, the commission developed criteria for classifying the terms of Article 29 Paragraph 1. The capacity to perform functions effectively was considered most important, whereas regional, historical, and cultural ties were considered as hardly verifiable. To fulfill administrative duties adequately, a population of at least five million per state was considered as necessary. After a relatively brief discussion and mostly negative responses from the affected states, the proposals were shelved. Public interest was limited or nonexistent. The referendum in Baden was held on 7 June 1970.
Pakistan is a diverse society with estimates suggesting it has between 75 and 85 languages. Urdu and English serve as the official languages, with Urdu being the country's lingua franca and a unifying force among over 75% of Pakistanis. According to the 2023 national census, the largest ethnolinguistic groups include the Punjabis (36.98%), Pashtuns (18.15%), Sindhis (14.31%), Saraikis (12%), Urdu speaking people (9.25%), Balochs (3.38%), Hindkowans/Hazarewals (2.32%), and Brahuis (1.16%). The remaining population consists of various ethnic minorities such as Kashmiris, Paharis, Chitralis, various peoples of Gilgit-Baltistan, Kohistanis, Torwalis, Meos, Hazaras, Kalash and Siddis. The Pakistani diaspora, numbering over seven million, is the sixth largest in the world.
== Pharmacology == The topical application of monobenzone in animals increases the excretion of melanin from melanocytes. The same action is thought to be responsible for the depigmenting effect of the drug in humans. Monobenzone may cause destruction of melanocytes and permanent depigmentation. The histology of the skin after depigmentation with topical monobenzone is the same as that seen in vitiligo; the epidermis is normal except for the absence of identifiable melanocytes. Therefore, monobenzone is used as a topical medicine to permanently depigment normal skin surrounding vitiliginous lesions only in patients with disseminated (greater than 50 percent of body surface area) idiopathic vitiligo. Monobenzone is also being considered for the treatment of melanoma.
Sources: en.wikipedia.org
=== Battle of Britain === During the battle, Chain Home stations – most notably the one at Ventnor, Isle of Wight – were attacked several times between 12 and 18 August 1940. On one occasion a section of the radar chain in Kent, including the Dover CH, was put out of action by a lucky hit on the power grid. Though the wooden huts housing the radar equipment were damaged, the towers survived owing to their open steel girder construction. Because the towers survived intact and the signals were soon restored, the Luftwaffe concluded the stations were too difficult to damage by bombing and left them alone for the remainder of the war.
He is a co-founder and board member of the Institute for the Study of Panspermia and Astroeconomics, set up in Japan in 2014, and the Editor-in-Chief of the Journal of Astrobiology & Outreach. He was a Visiting By-Fellow, Churchill College, Cambridge, England 2015/16; Professor and Director of the Buckingham Centre for Astrobiology at the University of Buckingham, a post he has held since 2011; Affiliated Visiting Professor, University of Peradeniya, Sri Lanka; and a board member and research director at the Institute for the Study of Panspermia and Astroeconomics, Ogaki-City, Gifu, Japan. In 2017, Wickramasinghe was appointed adjunct professor in the Department of Physics, at the University of Ruhuna, Matara, Sri Lanka.
=== Wax printing === Wax printing uses a simple printer to pattern wax on paper in a desired design. The wax is then melted with a hotplate to create channels. This technique is fast and low cost, but has relatively low resolution due to the isotropy of the melted wax.
Hong Kong is governed by a hybrid regime that is not fully representative of the population. Legislative Council members elected by functional constituencies composed of professional and special-interest groups are accountable to narrow corporate electorates rather than the general public. This electoral arrangement has ensured a pro-Beijing majority in the legislature since the handover. Similarly, the chief executive is selected by establishment politicians and corporate members of the Election Committee rather than directly elected. Despite universal suffrage being established as ultimate goals for the election of the chief executive and all members of the Legislative Council in Articles 45 and 68 of the basic law, the legislature is only partially directly elected, and the executive continues to be nominated by an unrepresentative body. The government has been repeatedly petitioned to introduce direct elections for these positions, but has not introduced these direct elections as of 2026. Ethnic minorities (except those of European ancestry) have marginal representation in government and often experience discrimination in housing, education, and employment. Employment vacancies and public service appointments frequently have language requirements that minority job seekers do not meet, and language education resources remain inadequate for Chinese learners. Foreign domestic helpers, mostly women from the Philippines and Indonesia, have little protection under regional law.
Due to globin defects, beta thalassemia patients do not have normal levels of adult hemoglobin (HbA), and instead have elevated levels of HbA2 (α2δ2). Production of this form of hemoglobin may increase as a consequence of stress erythropoiesis.
Sources: en.wikipedia.org
Cell breakdown products cannot be reused, and are therefore degraded. This gives rise to increased uric acid, a purine breakdown product. The de novo pathway is stimulated due to an excess of PRPP (5-phospho-D-ribosyl-1-pyrophosphate or simply phosphoribosyl-pyrophosphate). It was previously unclear whether the neurological abnormalities in LNS were due to uric acid neurotoxicity or to a relative shortage in "new" purine nucleotides during essential synthesis steps. Genetic mutations affecting the enzymes of the de novo synthesis pathway may possibly contribute to the disease, although these are rare or unknown. Uric acid has been suggested as a possible cause of neurotoxicity but this is unproven. Importantly, evidence suggests that one or more lesions in striatal dopaminergic pathways may be central to the neurological deficits, especially the choreoathetoid dyskinesia and self-mutilation. 6-hydroxydopamine toxicity in rodents may be a useful animal model for the syndrome, although this is not proven. However, the link between dopamine and purine synthesis is a nucleotide called guanosine triphosphate or 'GTP'. The first step of dopamine synthesis is GTP cyclohydrolase, and significantly a deficiency of this step produces a syndrome that has a neuropathology similar to LNS. Thus a lack of HGPRT may produce a nucleotide deficiency (specifically: GTP deficiency) disorder, resulting in dopamine deficiency. Another animal model for LNS has been proposed to arise from oxidative damage, caused by the hyperuricemia accompanying LNS.
==== Legion number and title (cognomen) ==== The numbering of the legions is confusing, since several legions shared the same number with others. Augustus numbered the legions he founded himself from I, but also inherited numbers from his predecessors. Each emperor normally numbered the legions he raised himself starting from I. However, even this practice was not consistently followed. For example, Vespasian kept the same numbers as before for legions he raised from disbanded units. Trajan's first legion was numbered XXX because there were 29 other legions in existence at the time it was raised; but the second Trajanic legion was given the sequential number II. XVII, XVIII and XIX, the numbers of the legions annihilated in the Teutoburg Forest, were never used again. (These three legions are without titles, suggesting that in disgrace their titles may have been deliberately forgotten or left unmentioned.) As a result of this somewhat chaotic evolution, the legion's title became necessary to distinguish between legions with the same number. Legions often carried several titles, awarded after successive campaigns, normally by the ruling emperor e.g. XII Fulminata was also awarded: paterna (fatherly), victrix (victorious), antiqua (venerable), certa constans (reliable, steadfast) and Galliena (Gallienus '). Pia fidelis (loyal and faithful), fidelis constans and others were titles awarded to several legions, sometimes several times to the same legion. Only the most established, commonly used titles are displayed on this table. The geographical titles indicate
==== England ==== Potassium alum was imported into England mainly from the Middle East, and, from the late 15th century onwards, the Papal States for hundreds of years. Its use there was as a dye-fixer (mordant) for wool (which was one of England's primary industries, the value of which increased significantly if dyed). These sources were unreliable, however, and there was a push to develop a source in England especially as imports from the Papal States ceased following the excommunication of Henry VIII. With state financing, attempts were made throughout the 16th century, but without success until the early 17th century. An industry was founded in Yorkshire to process the shale, which contained the key ingredient, aluminium sulfate, and made an important contribution to the Industrial Revolution. One of the oldest historic sites for the production of alum from shale and human urine are the Peak alum works in Ravenscar, North Yorkshire. By the 18th century, the landscape of northeast Yorkshire had been devastated by this process, which involved constructing 100-foot (30 m) stacks of burning shale and fuelling them with firewood continuously for months. The rest of the production process consisted of quarrying, extraction, steeping of shale ash with seaweed in urine, boiling, evaporating, crystallisation, milling and loading into sacks for export. Quarrying ate into the cliffs of the area, the forests were felled for charcoal and the land polluted by sulfuric acid and ash.
Mescaline has a wide array of suggested medical usage, including treatment of depression, anxiety, PTSD, nicotine dependence, and alcoholism. However, its status as a Schedule I controlled substance in the Convention on Psychotropic Substances limits availability of the drug to researchers. Because of this, very few studies concerning mescaline's activity and potential therapeutic effects in people have been conducted since the early 1970s. However, the drug is under development by Journey Colab under the code name JOUR-5700 and by Biomind Labs under the code names BMND04, BMND06, and BMND09 for various medical applications, such as treatment of alcoholism.
Sources: en.wikipedia.org
Dry powder is normally held at -20 °C or lower, away from light and moisture. Sealed vials can also be kept at 2-8 °C for shorter intervals. Warming to room temperature before opening prevents condensation.
In solution, hydrolysis of peptide bonds and oxidation of the methionine residue are the principal concerns. Oxidation converts methionine to its sulfoxide form, shifting the mass by sixteen daltons. Both processes are slowed by cold storage and by avoiding alkaline conditions.
A certificate documents what the supplier measured on a specific lot, not how a laboratory will use the material. Independent verification of identity and purity is common practice. Acceptance criteria should be defined before a batch is ordered.
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.