Everything below concerns freeze-thaw. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-01-23. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
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.
Selank is a synthetic heptapeptide developed in Russia. Its sequence is Thr-Lys-Pro-Arg-Pro-Gly-Pro, a seven-residue chain built around the natural tetrapeptide tuftsin. Researchers at the Institute of Molecular Genetics of the Russian Academy of Sciences first described the compound in the mid-1990s. The design combined the tuftsin core with an added Pro-Gly-Pro tail, a modification intended to extend the molecule's stability in biological fluids. Published work on the peptide has appeared mainly in Russian-language journals.
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.
| Property | Value | Notes |
|---|---|---|
| Common route | Intranasal | Also injected in some animal work |
| Solubility class | Freely soluble in water | Solid form is hygroscopic |
| Typical storage | About -20 degrees Celsius | Keep desiccated and dark |
| Purity method | Reverse-phase HPLC | Reported as area percent |
| Confirmatory method | Mass spectrometry | Verifies expected molecular mass |
Lyophilized Selank, the dry powder form, is generally stored frozen at minus 20 degrees Celsius or colder for long-term keeping. The solid is hygroscopic and should stay sealed, dry, and protected from light. Once dissolved, the peptide is less stable and is usually held refrigerated at 2 to 8 degrees Celsius for short periods. Repeated freezing and thawing is avoided because it can promote aggregation and loss of activity. Buffers and pH choice also affect how long a solution remains usable.
Solubility behavior is a practical concern for handling. Selank dissolves readily in water and in common aqueous buffers, which simplifies preparation of working solutions. The choice of solvent, ionic strength, and pH can influence aggregation over time, particularly at higher concentrations. Aqueous solutions are typically sterile-filtered before use. Because stability depends on several variables, storage and handling notes should be treated as general guidance rather than fixed rules, and specific values are best confirmed against a certificate of analysis for each batch.
Peptide bonds are vulnerable to protease attack, and Selank is no exception. Measured half-life in serum is short, on the order of minutes in several reports, which explains why intranasal administration is the common route described in the literature. Absorption across the nasal mucosa partially bypasses first-pass hepatic metabolism. Quantitative data on human bioavailability remain limited and are difficult to compare across studies.
Lyophilised material kept dry at minus 20 degrees Celsius or colder is the most stable form, and suppliers commonly state a shelf life of two years or more under those conditions. Once dissolved, degradation accelerates through hydrolysis and deamidation, particularly at alkaline pH or elevated temperature. Working solutions are usually divided into single-use aliquots to avoid repeated freeze-thaw cycles. The choice of reconstitution solvent affects both stability and the ionic strength of the final preparation.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro. It was designed at the Institute of Molecular Genetics of the Russian Academy of Sciences as a structural analogue of tuftsin, a naturally occurring tetrapeptide fragment of the immunoglobulin heavy chain. The added Pro-Gly-Pro tail was intended to slow enzymatic degradation and extend biological activity. In Russia it is registered as an anxiolytic nasal preparation, while regulators elsewhere have not approved it for clinical use.
Proposed mechanisms centre on modulation of the GABAergic system, with reports of altered expression of genes related to GABA-A receptor subunits and changed monoamine turnover. Some studies describe inhibition of enkephalinase, the enzyme that degrades endogenous enkephalins, which may prolong opioid peptide signalling. Effects on brain-derived neurotrophic factor and on cytokine expression have also been reported. These findings come largely from animal models and small human studies, and the precise primary target remains unresolved.
Published clinical evidence is limited. Most controlled trials were conducted in Russia, enrolled modest numbers of participants, and appeared in Russian-language journals, which restricts independent verification. Reported outcomes include lower anxiety scores, improved attention and memory measures, and changes in fatigue ratings. Reviews written in English note methodological limitations such as small samples and inconsistent endpoints. Whether the compound produces clinically meaningful benefit relative to established anxiolytics is therefore an open question rather than an established finding.
Patients with no history of red cell antibodies may qualify for computer-assisted crossmatch, which does not involve combining patient serum with donor cells. If an antibody is suspected, potential donor units must first be screened for the corresponding antigen by phenotyping them. Antigen negative units are then tested against the patient plasma using an antiglobulin/indirect crossmatch technique at 37 degrees Celsius to enhance reactivity and make the test easier to read. In urgent cases where crossmatching cannot be completed, and the risk of dropping hemoglobin outweighs the risk of transfusing uncrossmatched blood, O-negative blood is used, followed by crossmatch as soon as possible. O-negative is also used for children and women of childbearing age. It is preferable for the laboratory to obtain a pre-transfusion sample in these cases so a type and screen can be performed to determine the actual blood group of the patient and to check for alloantibodies.
biomarker A measurable indicator of some biological state, especially a compound or biomolecule whose presence or absence in a biological system is a reliable sign of a normal or abnormal process, condition, or disease. Things that may serve as biomarkers include direct measurements of the concentration of a particular compound or molecule in a tissue or fluid sample, or any other characteristic physiological, histological, or radiographic signal (e.g. a change in heart rate, or a distinct morphology under a microscope). They are regularly used as predictive or diagnostic tools in clinical medicine and laboratory research.
Neomorphic mutations are a part of the gain-of-function mutations and are characterized by the control of new protein product synthesis. The newly synthesized gene normally contains a novel gene expression or molecular function. The result of the neomorphic mutation is the gene where the mutation occurs has a complete change in function. A reversion (or back mutation) is a point mutation that restores the original sequence and hence the original phenotype.
== Further reading == Dyck E, Elcock C (2023). Expanding Mindscapes: A Global History of Psychedelics. MIT Press. ISBN 978-0-262-37689-1. Halberstadt AL, Franz X. Vollenweider, David E. Nichols, eds. (2018). Behavioral Neurobiology of Psychedelic Drugs. Vol. 36. Berlin, Heidelberg: Springer. ISBN 978-3-662-55878-2. Jay M (2019). Mescaline: A Global History of the First Psychedelic. New Haven, CT: Yale University Press. doi:10.2307/j.ctvgc61q9. ISBN 978-0-300-25750-2. S2CID 241952235. Letheby C (2021). Philosophy of Psychedelics. Oxford: Oxford University Press. doi:10.1093/med/9780198843122.001.0001. ISBN 978-0-19-884312-2. Richards WA (2016). Sacred Knowledge: Psychedelics and Religious Experiences. New York: Columbia University Press. ISBN 978-0-231-54091-9. Siff S (2015). Acid Hype: American News Media and the Psychedelic Experience. Champaign, Illinois: University of Illinois Press. ISBN 978-0-252-09723-2. Winstock, Ar; Timmerman, C; Davies, E; Maier, Lj; Zhuparris, A; Ferris, Ja; Barratt, Mj; Kuypers, Kpc (2021). Global Drug Survey (GDS) 2020 Psychedelics Key Findings Report.
After an incompatible transfusion the recipient may develop an antibody to the antigen and will react to any further incompatible transfusions. This antibody is important because it is the most frequent cause of hemolytic disease of the newborn. Incompatible red blood cells are sometimes given to recipients who will never become pregnant, such as males or postmenopausal women, as long as they do not have an antibody, since the greatest risk of Rh incompatible blood is to current or future pregnancies. For RBCs, type O negative blood is considered a "universal donor" as recipients with types A, B, or AB can almost always receive O negative blood safely. Type AB positive is considered a "universal recipient" because they can receive the other ABO/Rh types safely. These are not truly universal, as other red cell antigens can further complicate transfusions. There are many other human blood group systems and most of them are only rarely associated with transfusion problems. A screening test is used to identify if the recipient has any antibodies to any of these other blood group systems. If the screening test is positive, a complex set of tests must follow to identify which antibody the recipient has by process of elimination. Finding suitable blood for transfusion when a recipient has multiple antibodies or antibodies to extremely common antigens can be very difficult and time-consuming. Because this testing can take time, doctors will sometimes order a unit of blood transfused before it can be completed if the recipient is in critical condition.
Sources: en.wikipedia.org
The Affordable Insulin Now Act is a bill in the United States Congress intended to cap out-of-pocket insulin prices under private health insurance and Medicare at no more than $35 per month. The bill was first introduced on February 25, 2022, by Representative Angie Craig (D-MN). On March 31, 2022, the bill passed the House of Representatives, 232–193. A version of the bill contained in the Inflation Reduction Act (IRA) for private health insurance was blocked by Senate Republicans on August 8, 2022. However, the inflation reduction legislation did cap out-of-pocket insulin cost at $35 per monthly prescription for the following:
The Australian Football League (AFL) started in 1897 and was originally called the Victorian Football League until its name change in 1990 due to its expansion to other Australian states. AFL is often viewed as an iconic Australian sport which attracts large crowds averaging 35,000 people per game. Drugs are usually known as a chemical compound that has an effect on a person's body in some way, either physically or psychologically. Drugs specific to elite sports, such as AFL, can include anabolic steroids and stimulants due to their performance-enhancing effects. The consumption of these drugs is known as doping. Doping is the administration of drugs to enhance the performance of a person or athlete. This can create unfair advantages in the game and also could lead to many health risks to the players that are doping. The AFL also has practices in place related to the use of illicit recreational drugs.
=== ThermoFluor of membrane proteins === Membrane proteins are often isolated in the presence of hydrophobic solubilizing agents that can partition hydrophobic-binding dyes like 1,8-ANS and SYPRO orange and generate a fluorescence background that obscures observation of a Thermofluor protein melting signal. Nevertheless, careful optimization of conditions (e.g., to avoid micelle formation of the solubilizing agent) can often produce satisfactory assay conditions
syringae bacteria can adapt genetically to infect resistant plants, and the process for resistance breeding has to start over again. A combination treatment of bacteriophage and carvacrol shows promise in control of both the planktonic and biofilm forms.
Sources: en.wikipedia.org
In June 2020, HHS announced an unusual agreement with Gilead in which HHS agreed to Gilead's wholesale acquisition price, HHS would continue to work together with state governments and drug wholesaler AmerisourceBergen to allocate shipments of remdesivir vials to American hospitals through the end of September 2020, and in exchange, during that three-month timeframe (July, August, and September), American patients would be allocated over 90% of Gilead's projected remdesivir output of more than 500,000 treatment courses. Absent from these announcements was any discussion of allocation of remdesivir production to the approximately 70 countries omitted from Gilead's generic drug licensing agreements—including much of Europe and countries as populous as Brazil, China, and Mexico—or the 127 countries listed on those agreements (during the time it will take for Gilead's generic licensees to ramp up their own production). As the implications of this began to sink in, several countries publicly confirmed the next day that they already had adequate supplies of remdesivir to cover current needs, including Australia, Germany, and the United Kingdom. In August 2020, the FDA broadened the Emergency Use Authorization (EUA) for remdesivir to include all hospitalized patients with suspected or laboratory-confirmed COVID‑19, irrespective of the severity of their disease. The Fact Sheet was updated to reflect the new guidance.
Lay the foundations to enable AI: securing world-class computing and data infrastructure, access to talent, and an appropriate regulatory environment. Key commitments include expanding the AI Research Resource (AIRR) by at least 20 times by 2030, establishing "AI Growth Zones" (AIGZs) to accelerate the build-out of AI data centres through streamlined planning and power provisioning, and developing a sovereign AI compute capability. Change lives by embracing AI: driving rapid AI adoption in the public sector, including in the National Health Service, education, and government administration, to improve public services and boost productivity. Secure our future with homegrown AI: positioning the UK as a partner of choice for frontier AI developers and building domestic AI companies that operate at multiple layers of the "AI stack", to ensure the UK benefits economically and has influence over the values and governance of future AI systems. The government projected that AI adoption could grow the UK economy by an additional £400 billion by 2030 and committed to a £2 billion investment in AI infrastructure. The UK government has proposed a plan to boost the country's AI infrastructure and expand its use in public services, with the UK Prime Minister Keir Starmer saying that the country would become one of the "AI superpowers".
There exist dozens of recognized schools or orientations of psychotherapy—the list below represents a few influential orientations not given above. Although they all have some typical set of techniques practitioners employ, they are generally better known for providing a framework of theory and philosophy that guides a therapist in his or her working with a client.
Sources: en.wikipedia.org
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.
Reported human trials are few, brief and originate mainly from one country. They describe effects on anxiety-related measures, but sample sizes are small and reporting is limited. The results are widely regarded as preliminary rather than confirmed.
Reverse-phase liquid chromatography is used to assess purity and separation of related impurities. Mass spectrometry confirms that the observed molecular mass matches the expected peptide. A certificate of analysis from the supplier is the usual document of record.
Selank is a synthetic peptide made of seven amino acids. It is modeled on tuftsin, a natural tetrapeptide, with an added three-residue tail. It is not a small-molecule drug.