Everything below concerns nootropic. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-05-17. Numbers and descriptions here follow the published literature rather than marketing material.
Regulatory treatment varies by jurisdiction. In Russia the compound is a registered prescription product, while in the European Union and the United States it is generally handled as a research chemical without a marketing authorization. Suppliers therefore operate outside pharmaceutical oversight, and buyers rely on supplier documentation for purity and identity claims. Chain of custody and third-party testing are the main verification tools. Analysts note that the absence of a pharmacopoeial monograph for research-grade material limits standardization across vendors.
Purity assessment relies mainly on reverse-phase high-performance liquid chromatography with ultraviolet detection. Because the peptide lacks a strong chromophore, detection often uses backbone absorbance near 214 nm. Identity is confirmed by mass spectrometry, typically electrospray ionization or matrix-assisted laser desorption, comparing the measured mass against the expected value. Amino acid analysis can verify composition after acid hydrolysis. Diastereomer content and residual counterions are reported less often, although both can influence biological assays.
Lyophilized material is generally stable for extended periods when kept dry at or below minus twenty degrees Celsius. Working solutions are less stable, and common practice is to aliquot and freeze them so that repeated freeze-thaw cycles are avoided. Aqueous solutions are sensitive to pH extremes and to microbial growth, so short-term storage at refrigerator temperature is typical. Oxidation and hydrolysis are the principal degradation routes. Reconstitution with sterile water or a mild buffer is standard, and solutions should be protected from light.
Outside its country of origin the compound is generally handled as a research chemical rather than an approved medicine. No regulatory approval from the United States Food and Drug Administration or the European Medicines Agency has been granted for human use. Identity and purity are normally checked by reverse-phase high-performance liquid chromatography, with mass spectrometry used to confirm the molecular mass. Lyophilised material is stored cold and desiccated, and repeated freeze-thaw cycles are avoided.
Published work on this peptide almost always uses intranasal delivery, with drops or a spray applied to the nasal mucosa. Some animal experiments have used subcutaneous or intraperitoneal injection, and a smaller number have compared routes directly. Oral administration is not a focus of the literature, because short peptides of this size are broken down by digestive enzymes and cross intestinal barriers poorly. How much of an intranasal dose reaches the bloodstream intact in humans remains an open question.
Animal studies have examined behaviour in tests of anxiety, memory retention and stress response, and several report changes in neurotrophic or neurotransmitter-related markers. The human evidence base is much smaller, consisting mainly of short trials conducted in Russia with limited reporting in English-language journals. Sample sizes are modest and outcome measures vary between studies, so the findings are best described as preliminary. Independent replication under modern trial standards has not been widely reported.
| Property | Value | Notes |
|---|---|---|
| Typical purity report | 95% or higher by HPLC | Area percentage at 214 nm |
| Identity confirmation | Mass spectrometry | Electrospray or MALDI |
| Powder storage | -20 C, desiccated | Protect from light |
| Solution storage | 2-8 C short term | Freeze aliquots for longer |
| Quality document | Certificate of analysis | States method and value |
Dry powder is normally held at -20 degrees Celsius or lower, in a sealed container with desiccant and protection from light. Reconstituted solutions are usually kept at 2 to 8 degrees Celsius for short periods and frozen for longer ones. Proline residues at several positions are generally associated with some resistance to peptidase attack, but chemical stability still declines at neutral to alkaline pH and at elevated temperature. Exact shelf-life figures are product-specific and are not standardised across suppliers.
Identity and purity are usually assessed by reversed-phase high-performance liquid chromatography, with mass spectrometry used to confirm molecular mass and sequence information. Amino acid analysis and peptide mapping may supplement these methods. Certified reference standards are scarce, and many commercial lots are sold as research chemicals without a pharmacopoeial monograph. Regulatory treatment differs by country: Selank is a registered prescription medicine in Russia, while in the European Union and the United States it is not an approved drug and may fall under research-chemical or unapproved-product frameworks.
Selank is a hydrophilic peptide and dissolves readily in water and in aqueous buffers. The lyophilised powder is typically a white to off-white solid. Because short peptides are prone to hydrolysis and oxidation, handling benefits from limiting exposure to heat, moisture and strong light. Working solutions are commonly prepared in sterile water or saline, and repeated freeze-thaw cycles are avoided to reduce aggregation and loss of activity. These practices reflect general laboratory convention rather than published stability specifications.
Selank is a synthetic heptapeptide developed in Russia during the 1990s. Researchers at the Institute of Molecular Genetics of the Russian Academy of Sciences designed it as a stabilized analog of tuftsin, a naturally occurring immunomodulatory tetrapeptide. The compound has been studied primarily for its reported anxiolytic and nootropic effects. It remains largely unknown in Western pharmacology and is not approved as a medicine by major regulators such as the FDA or the EMA.
The primary structure of Selank is Thr-Lys-Pro-Arg-Pro-Gly-Pro, corresponding to the molecular formula C33H57N11O9 and a monoisotopic mass of roughly 751.9 daltons. The N-terminal threonine and the arginine residue in the fourth position are shared with tuftsin, which carries the sequence Thr-Lys-Pro-Arg. The three additional residues at the C-terminus, Pro-Gly-Pro, extend the chain and are associated with greater resistance to enzymatic degradation. This extension also separates Selank from the shorter parent peptide.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro, written TKPRPGP in one-letter notation. Its structure consists of the immunomodulatory tetrapeptide tuftsin, Thr-Lys-Pro-Arg, extended at the carboxyl terminus by a Pro-Gly-Pro segment. The molecular formula is commonly given as C33H57N11O9, corresponding to a monoisotopic mass near 751.4 Da and an average molecular mass near 751.9 Da. All seven residues are proteinogenic amino acids, and the molecule carries no modified side chains or non-natural linkages.
The compound was designed at the Institute of Molecular Genetics of the Russian Academy of Sciences during the 1980s and 1990s. The stated design goal was to retain the immunomodulatory and central nervous system activity attributed to tuftsin while improving resistance to enzymatic breakdown. Adding a proline-rich tail to the short parent peptide was a deliberate strategy, because proline residues restrict the conformations available to many peptidases. The same laboratory produced Semax, an ACTH fragment analog, and both compounds were developed in parallel as short, enzymatically stabilized peptides intended for intranasal use.
Selank is not a naturally occurring peptide and has no known endogenous counterpart in human physiology. Russian-language sources frequently call it TP-7, while English-language sources use the name Selank almost exclusively. Database indexing is uneven, partly because early reports appeared in regional journals that are not widely cataloged. Some summaries describe the material as a tuftsin analog and others as a synthetic heptapeptide; the labels overlap rather than conflict. Citing the primary sequence resolves ambiguity more reliably than the research or trade name alone.
Reported activity for Selank centers on anxiolytic and nootropic effects. Russian clinical reports describe use in anxiety and in cognitive or attention-related complaints. Most of this evidence comes from studies conducted by the same research groups that developed the peptide. Independent replication in other countries remains limited, and no major Western regulatory agency has approved the compound for any indication. The gap between local reports and external verification is a recurring point in discussions of the peptide.
Tuftsin, the parent structure, is a naturally occurring immunomodulatory tetrapeptide released from the Fc region of immunoglobulin G by spleen enzymes. Selank extends this four-residue sequence with three additional amino acids. The stated rationale is that the added tail slows enzymatic breakdown and may influence receptor interactions. How the full heptapeptide behaves at the molecular level is not firmly established, and proposed mechanisms often involve indirect modulation of neurotransmitter or immune signaling rather than a single defined target.
The Frankland-Duppa Reaction in which an oxalate ester (ROCOCOOR) reacts with an alkyl halide R'X, zinc and hydrochloric acid to form α-hydroxycarboxylic esters RR'COHCOOR Organozincs have similar reactivity to Grignard reagents but are much less nucleophilic, and they are expensive and difficult to handle. Organozincs typically perform nucleophilic addition on electrophiles such as aldehydes, which are then reduced to alcohols. Commercially available diorganozinc compounds include dimethylzinc, diethylzinc and diphenylzinc. Like Grignard reagents, organozincs are commonly produced from organobromine precursors. Zinc has found many uses in catalysis in organic synthesis including enantioselective synthesis, being a cheap and readily available alternative to precious metal complexes. Quantitative results (yield and enantiomeric excess) obtained with chiral zinc catalysts can be comparable to those achieved with palladium, ruthenium, iridium and others.
Klaus Hermann Mosbach (26 November 1932 – 22 January 2024) was a Swedish applied biochemist based at Lund University. He founded the Center for Molecular Imprinting in Lund, Sweden and was co-founder of the Institute of biotechnology at ETH Zurich Switzerland 1982. He was a great visionary who gave shape to the modern era of Molecular imprinting for which he was awarded the plaque at the international meeting of molecular imprinting in 2010 in New Orleans, United States.
college sports) SOD (i/a) School Of Dentistry Statement Of Difference(s) Statement Of Direction Statement Of Documentation Statement Of Duty/Duties SOE (i) Secret Of Evermore Special Operations Executive (WWII British organization) State Of Emissions (EW) SOF (a/i) Special Operations Force(s) Status of Forces SOFIA – (a) Stratospheric Observatory For Infrared Astronomy SOGAT (a) Society of Graphical and Allied Trades Former British printing union SOHC – (i) Single-OverHead-Cam engine SOHO – (p) Solar and Heliospheric Observatory SOI (i) Signal Operating Instruction (i) Southern Oscillation Index SOL – (i) Shit Out of Luck SOLIS – (i) Synoptic Optical Long-term Investigations of the Sun som – (s) Somali language (ISO 639-2 code) SOM (a) Simulation Object Model (s) Somalia (ISO 3166 trigram) Sonar – (p) SOund Navigation And Ranging SOP (i) Standing/Standard Operating Procedure State of Play SOR (i) State Of Readiness Statement Of Requirements SOS (s) Somali shilling (ISO 4217 currency code) Save Our Souls SOSTAR – (a) Stand-Off Surveillance and Target Acquisition Radar sot – (s) Sotho language (ISO 639-2 code) SOUTHAG – (p) Southern Army Group SOUTHCOM – (p) (U.S.) Southern Command SOV – (i) Single Occupant Vehicle SOW – (i) Statement Of Work SOWHAT – (p) RESNA Subcommittee on Wheelchairs and Transportation SOX – (p) Sarbanes–Oxley Act
=== Infection === The use of greater amount of red blood cells has been suggested to increase the risk of infections, not only transfusion-transmitted infections, but also due to a phenomenon known as transfusion-related immunomodulation (TRIM). TRIM may be caused by macrophages and their byproducts. In those who were given red blood cells only with significant anemia ("restrictive" strategy), serious infection rates were 10.6% while in those who were given red blood at milder levels of anemia ("liberal" strategy), serious infection rates were 12.7%. On rare occasions, blood products are contaminated with bacteria. This can result in a life-threatening infection known as transfusion-transmitted bacterial infection. The risk of severe bacterial infection is estimated, as of 2020, at about 1 in 2,500 platelet transfusions, and 1 in 2,000,000 red blood cell transfusions. Blood product contamination, while rare, is still more common than actual infection. The reason platelets are more often contaminated than other blood products is that they are stored at room temperature for short periods of time. Contamination is also more common with longer duration of storage, especially if that means more than 5 days. Sources of contaminants include the donor's blood, donor's skin, phlebotomist's skin, and containers. Contaminating organisms vary greatly, and include skin flora, gut flora, and environmental organisms. There are many strategies in place at blood donation centers and laboratories to reduce the risk of contamination.
cell fusion The merging or coalescence of two or more cells into a single cell, as occurs in the fusion of gametes to form a zygote. Generally this occurs by the destabilization of each cell's plasma membrane and the formation of cytoplasmic bridges between them which then expand until the two cytoplasms are completely mixed; intercellular structures or organelles such as nuclei may or may not fuse as well. Some cells can be artificially induced to fuse with each other by treating them with a fusogen such as polyethylene glycol or by passing an electric current through them.
Sources: en.wikipedia.org
=== Research for therapeutic use === The classification of L-serine as a non-essential amino acid has come to be considered as conditional, since vertebrates such as humans cannot always synthesize optimal quantities over entire lifespans. Safety of L-serine has been demonstrated in an FDA-approved human phase I clinical trial with Amyotrophic Lateral Sclerosis, ALS, patients (ClinicalTrials.gov identifier: NCT01835782), but treatment of ALS symptoms has yet to be shown. A 2011 meta-analysis found adjunctive sarcosine to have a medium effect size for negative and total symptoms of schizophrenia. There also is evidence that L‐serine could acquire a therapeutic role in diabetes. D-Serine is being studied in rodents as a potential treatment for schizophrenia. D-Serine also has been described as a potential biomarker for early Alzheimer's disease (AD) diagnosis, due to a relatively high concentration of it in the cerebrospinal fluid of probable AD patients. D-serine, which is made in the brain, has been shown to work as an antagonist/inverse co-agonist of t-NMDA receptors mitigating neuron loss in an animal model of temporal lobe epilepsy. D-Serine has been theorized as a potential treatment for sensorineural hearing disorders such as hearing loss and tinnitus.
==== Inner city development ==== Heseltine faced initial suspicion from Labour-led Merseyside Council, but got on well with Sir Trevor Jones, Liberal leader of Liverpool City Council. Jones, also a self-made businessman, got on well with Heseltine, and Jones claimed that Heseltine admitted to him late one night that he was a Liberal at heart, but could not bear the thought of having no realistic chance to win power. Inspired by the Bundesgartenschauen which had helped to regenerate German cities after the war, Heseltine arranged for the first of five biennial National garden festivals to be held in Liverpool in 1984 (Jones arranged for the council to delegate the bid to the Merseyside Development Corporation, of which he was a director). More than 3 million people eventually attended. Heseltine arranged for Liverpool to receive unused government grants for other cities (from the Urban Programme), although the money was less than had been clawed back from Liverpool through council spending cuts. He also played an important role in the redevelopment of Albert Dock, the development of Wavertree Technology Park (the land purchased by £10 million of public money) and the development of Cantril Farm estate into Stockbridge Village, arranging for Barratt Developments to build many new houses for owner occupiers. Heseltine also played an important role in the development of Urban Development Corporations, directly appointed by the minister and overriding local authority planning controls to spend government money on infrastructure.
Pea protein is a food product and protein supplement derived and extracted from yellow and green split peas, Pisum sativum. It can be used as a dietary supplement to increase an individual's protein or other nutrient intake, or as a substitute for other food products (e.g. the substitution of dairy milk by pea milk). As a powder, it is used as an ingredient in food manufacturing, such as a thickener, foaming agent, or an emulsifier. It is extracted in a powder form and can be processed and produced in different ways:
=== Violence towards voters === On October 30, 2024, an 18-year-old man in Jacksonville, Florida, was arrested for aggravated assault and improper exhibition of a dangerous weapon after brandishing a machete at two women outside an early voting center. He, along with seven other teenagers, allegedly approached and antagonized members of the opposing political party as they were demonstrating. Neither the teenager's nor the women's political parties were disclosed, although later posts by the Duval Democratic Party described the teenager's party as a "group of young men carrying Trump flags". On November 1, 2024, a voter wearing a "Let's Go Brandon" hat was reportedly struck by a poll worker after a verbal altercation over his hat at an Orangeburg County, South Carolina, polling location. Also on November 1, a man in Bath, New York, was arrested for assaulting someone in a supermarket for wearing a Trump hat.
Sources: en.wikipedia.org
aeruginosa has also been reported to possess multidrug efflux pumps systems that confer resistance against a number of antibiotic classes, and the MexAB-OprM (Resistance-nodulation-division (RND) family) is considered as the most important. An important factor found to be associated with antibiotic resistance is the decrease in the virulence capabilities of the resistant strain. Such findings have been reported in the case of rifampicin-resistant and colistin-resistant strains, in which decrease in infective ability, quorum sensing, and motility have been documented. Mutations in DNA gyrase are commonly associated with antibiotic resistance in P. aeruginosa. These mutations, when combined with others, confer high resistance without hindering survival. Additionally, genes involved in cyclic-di-GMP signaling may contribute to resistance. When P. aeruginosa is grown under in vitro conditions designed to mimic a cystic fibrosis patient's lungs, these genes mutate repeatedly. Two small RNAs, Sr0161 and ErsA, were shown to interact with mRNA encoding the major porin OprD responsible for the uptake of carbapenem antibiotics into the periplasm. The sRNAs bind to the 5'UTR of oprD, causing increase in bacterial resistance to meropenem. Another sRNA, Sr006, may positively regulate (post-transcriptionally) the expression of PagL, an enzyme responsible for deacylation of lipid A. This reduces the pro-inflammatory property of lipid A. Furthermore, similar to a process found in Salmonella, Sr006 regulation of PagL expression may aid in polymyxin B resistance.
There is also evidence that patients with a family history of Parkinson's or a genetic predisposition to the disease are more likely to develop the drug induced form of this disease as a result of cinnarizine treatment. In addition to antagonizing D2 receptors, treatment with cinnarizine leads to reduced presynaptic dopamine and serotonin, as well as alterations in vesicular transport of dopamine. Chronic treatment with cinnarizine builds the drug concentrations high enough that they interfere with the proton electrochemical gradient necessary for packaging dopamine into vesicles. Cinnarizine, pKa = 7.4, acts as a protonophore, which prevents the MgATP-dependent production of the electrochemical gradient crucial to the transport and storage of dopamine into vesicles, and thereby lowers the levels of dopamine in the basal ganglia neurons and leads to the Parkinson's symptoms. Several cases of pediatric and adult cinnarizine overdose have been reported, with effects including a range of symptoms such as somnolence, coma, vomiting, hypotonia, stupor, and convulsions. The cognitive complications likely result from the antihistaminic effects of cinnarizine, while the motor effects are a product of the antidopaminergic properties. In cases of overdose, the patient should be brought to and observed in a hospital for potential neurological complications.
Executive mental function was measured with standard tests, including the ability to say the sequence 1-A, 2-B, 3-C..., to name a number of animals in one minute, and with the Stroop test. The study found that those individuals with lower skeletal muscle mass at the start of the study declined in their executive mental function considerably more sharply than those with higher muscle mass. Memory, as well as psychomotor speed, on the other hand, did not correlate with skeletal muscle mass. Thus, larger muscle mass, with a concomitantly larger secretome, appeared to have the endocrine function of protecting the executive mental function of individuals over the age of 65.
Sources: en.wikipedia.org
Purity is usually reported as an HPLC area percentage, most often measured at 214 nm. Identity is confirmed separately by mass spectrometry. A certificate of analysis should state both the method and the observed value.
Dry powder is kept frozen, desiccated, and shielded from light. Dissolved material is aliquoted and frozen to limit freeze-thaw cycles. Short-term refrigerated storage is common for working solutions.
Russia registers it as a prescription nasal product. Most other markets classify it as a research chemical with no approved medical use. Oversight of purity and labeling is consequently minimal in those markets.
Most published work uses intranasal application, either as drops or as a nasal spray. Injection routes appear in a smaller set of animal experiments. Oral use is uncommon in the literature because peptide breakdown and poor absorption limit this route.