Everything below concerns Research chemical. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-05-01. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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.
Naming conventions place Selank in the same research family as Semax, another Russian-developed peptide investigated for cognitive effects. The two compounds share a lineage but differ in sequence and in the biological systems proposed as their targets. Semax descends from ACTH fragments, whereas Selank descends from tuftsin. Publications sometimes identify Selank by its full peptide sequence or by laboratory codes rather than one uniform trade name. Because replication outside Russia is limited, reports on its properties are best read alongside the study design and the purity of the material tested.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Lyophilised solid form |
| Solubility class | Freely soluble in water | Hydrophilic heptapeptide |
| Dry storage temperature | -20 degrees Celsius or lower | Sealed, desiccated, protected from light |
| Solution storage | 2 to 8 degrees Celsius short term | Avoid repeated freeze-thaw cycles |
| Common identification method | Reversed-phase HPLC with mass spectrometry | Confirms purity and molecular mass |
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.
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.
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.
An electronic cigarette consists of an atomizer, a power source such as a battery, and a container for e-liquid such as a cartridge or tank. E-cigarettes come in many shapes and sizes, including disposable devices, refillable devices, and devices with pre-filled cartridges or pods. E-cigarettes have evolved over time, and the different designs are classified in generations. First-generation e-cigarettes tend to look like traditional cigarettes and are called "cigalikes". Second-generation devices are larger and look less like traditional cigarettes. Third-generation devices include mechanical mods and variable voltage devices. The fourth-generation includes sub-ohm tanks (meaning they have electrical resistance of less than 1 ohm) and temperature control. There are also pod mod devices that use protonated nicotine, rather than free-base nicotine found in earlier generations, providing higher nicotine yields. Some electronic cigarettes contain synthetic nicotine analogues (for example, 6-methyl nicotine, sometimes marketed under the trade name "Metatine") and makers are trying develop nicotine substitutes.
==== Astronomy ==== In astronomy, in situ measurement involves collecting data directly at or near a celestial object using spacecraft or instruments physically present at the location. For example, the Parker Solar Probe conducts in situ studies of the Sun's atmosphere, while the Cassini–Huygens mission similarly analyzed Saturn's magnetosphere. In situ formation refers to astronomical objects that formed at their current locations without significant migration. Some theories propose that planets, such as Earth, formed in their present orbits rather than moving from elsewhere. Star clusters may form within their host galaxy, rather than being accreted from external sources.
== Real-time air monitoring == The first SCIEX product, introduced in 1979, was the TAGA (Trace Atmospheric Gas Analyzer) quadrupole mass spectrometer system, which used atmospheric-pressure chemical ionization (APCI) for direct air analysis. Use of a cryopump vacuum system run by a liquid helium compressor allowed the instrument to be mounted in a large van for mobile operation, and operated while in motion to monitor concentrations of air pollutants. In 1981, the TAGA 6000, the first commercial triple quadrupole mass spectrometer, was introduced also in both lab-based and mobile configurations. Systems were acquired by, among others, government environmental agencies in Ontario and New York State, and the USEPA, and have been used in various applications such as tracking fugitive emission plumes from industrial sites, analysis of gases from contaminated homes in the Love Canal area and for air monitoring in the Gulf area after the BP spill in 2010. In 1979, the TAGA 3000 was used for real-time monitoring of toxic gas plumes of chlorine, styrene and other gases released from the Mississauga train derailment and fire providing timely information for emergency personnel.
A fully oxygenated orthorhombic YBa2Cu3O7−x sample can be transformed into tetragonal YBa2Cu3O6 by heating in a vacuum at temperature above 973 K (700 °C). The preparation of Bi-, Tl- and Hg-based high-Tc superconductors is more difficult than the YBCO preparation. Problems in these superconductors arise because of the existence of three or more phases having a similar layered structure. Thus, syntactic intergrowth and defects such as stacking faults occur during synthesis and it becomes difficult to isolate a single superconducting phase. For Bi–Sr–Ca–Cu–O, it is relatively simple to prepare the Bi-2212 (Tc ≈ 85 K) phase, whereas it is very difficult to prepare a single phase of Bi-2223 (Tc ≈ 110 K). The Bi-2212 phase appears only after few hours of sintering at 1,130–1,140 K (860–870 °C), but the larger fraction of the Bi-2223 phase is formed after a long reaction time of more than a week at 1,140 K (870 °C). Although the substitution of Pb in the Bi–Sr–Ca–Cu–O compound has been found to promote the growth of the high-Tc phase, a long sintering time is still required.
Sources: en.wikipedia.org
=== Venoms === Certain types of venom, such as those produced by venomous snakes, can also cause proteolysis. These venoms are, in fact, complex digestive fluids that begin their work outside of the body. Proteolytic venoms cause a wide range of toxic effects, including effects that are:
== Recreational use == In 1979, the first case of xylazine toxicity was reported in a 34-year-old male who had self-medicated for insomnia with an injection of 1g of xylazine. In the US, Xylazine is not regulated as a controlled substance under the Controlled Substances Act. It is sold online through distributors often without requiring proof of a veterinary license. The cost to purchase Xylazine from overseas suppliers is around $6–20 per kilogram. This low price makes it attractive for dealers looking for a cheap additive that is addictive and not treatable with opiate withdrawal medications. The withdrawal can last for two weeks and has a quicker onset than fentanyl. As an adulterant, xylazine is most commonly ingested with fentanyl. Xylazine has also been reported in combination with medetomidine, another potent α2-adrenergic receptor agonist. It is unknown if drug users are ingesting it knowingly. As of 2024, Seattle police report that some users wrongly believe they are consuming higher-quality fentanyl. Xylazine's street name in Puerto Rico is anestesia de caballo, which translates to "horse anesthetic". From 2002 to 2008, its use was associated with a high number of inmate deaths at the Guerrero Correctional Institution in Aguadilla, Puerto Rico. Xylazine's street name in the United States, particularly when it is mixed with fentanyl, is "tranq", "tranq dope" and "zombie drug". As of 2012, xylazine users in Puerto Rico were more likely to be male, under age 30, living in a rural area, and injecting rather than inhaling xylazine.
For services to People with Autism and their Families in Oxfordshire. Elizabeth Craig Ovens. Director, McCaskies Butchers. For services to Retail and to the Economy in Scotland. Alfred Oluwafemi Oyekoya. Director, Black Asian Minority Ethnic Mental Health Support. For services to Minority Ethnic Communities in Wales. Caroline Rebecca Paige. For services to Armed Forces Personnel and Veterans. The Reverend Canon Dr. Crispin Alexander Pailing. Member, Merseyside Resilience Forum and Safety Advisory Group. For services to the community in Liverpool, Merseyside. Blair Parham. Director of Music and Principal Conductor, Scottish Fiddle Orchestra. For services to Scottish Music. Satish Manilal Parmar. Senior Policy Adviser, Department for Work and Pensions. For Public Service. Carys Parry. Voluntary Party Manager, Conservative Party. For Political Service. Imran Adam Patel. For services to the community in Blackburn, Lancashire. Wolodymyr Pawluk. Chair, London Branch, Association of Ukrainians in Great Britain and Member, National Executive Committee, Ukrainian Youth Association. For services to the Ukrainian Community. Ewan Benjamin Payne. Team UK Gold Medal Winner, WorldSkills UK. For services to Further Education. Catherine Penny. For services to Plant Heritage and to the community in North Preston, Lancashire. Professor Yvonne Perrie. Professor of Drug Delivery and Head, Institute for Pharmacy and Biomedical Sciences. For services to Pharmaceutical Innovation and Regulation. Timothy Foster Pick.
== COVID-19 pandemic == ADLM members who are frontline laboratory specialists also encounter significant challenges in carrying out such studies. Lack of product selection and research materials as well as personal protective equipment, known as PPE, are the most important of these barriers. In recognition of these obstacles to optimizing research ability, ADLM sent a letter to the Coronavirus Task Force advising the Task Force and White House to minimize supply chain issues, and to identify and organize tools such that doctors, nurses, laboratory personnel and other healthcare staff may do their jobs. ADLM has produced instructional videos demonstrating serology, treatment of polymerase chain reaction (PCR), and more through research in the spotlight during the COVID-19 pandemic.
=== Diabetes mellitus === Epinephrine signals early warning of the upcoming hypoglycemia. Beta blockers' inhibition on epinephrine's effect can somewhat exacerbate hypoglycemia by interfering with glycogenolysis and mask signs of hypoglycemia such as tachycardia, palpitations, diaphoresis, and tremors. Diligent blood glucose level monitoring is necessary for a patient with diabetes mellitus on beta blockers.
Sources: en.wikipedia.org
A phase I clinical research study to test the safety and efficacy of a combination chemotherapy regimen consisting of methotrexate, L-asparaginase, idarubicin, and dexamethasone followed by allogenic or autologous bone marrow transplantation in 26 participants newly diagnosed with BPDCN is planned but not yet in its recruiting phase. While few studies have reported on the treatment of BPDCN that has recurred following initial therapy, donor lymphocyte infusions coupled with alternative chemotherapy treatments have induced second complete or partial remissions in a few patients.
=== Eligibility for different stages of treatment === While a mental health assessment is recommended as standard practice by the WPATH Standards of Care (SoC), psychotherapy is not an absolute requirement but is highly recommended. Hormone replacement therapy is to be initiated from a qualified health professional. The general requirements, according to the WPATH standards, include:
=== Outreach === Nigam is a trained STEM Ambassador and delivers lessons on microbiology and entomology to pupils at local schools. She participated in the 2014 Soapbox Science public engagement event in Swansea. Nigam works to change the Welsh school curriculum in order to promote gender equality in STEM.
Military logistics is the science of planning and carrying out the movement and maintenance of armed forces. In its most comprehensive sense, those aspects of military operations that deal with: a. design and development, acquisition, storage, movement, distribution, maintenance, evacuation, and disposition of materiel; b. movement, evacuation, and hospitalization of personnel; c. acquisition or construction, maintenance, operation and disposition of facilities; and d. acquisition or furnishing of services. The main difference between the concept of logistic management and supply-chain management is the level of information gathered, processes, analysed and used for decision making. An SCM-based organization not only having concerns with its immediate clients but also handles and forecasts the factors affecting directly or indirectly their supplier or suppliers or on their client or clients. If we exclude this information part out of supply chain model then we can see the logistic management part of the business.
Sources: en.wikipedia.org
Dry powder is normally held at -20 degrees Celsius or below in a sealed, light-protected container with desiccant. Brief room-temperature handling during weighing is generally tolerated. Storage instructions vary between suppliers, so the accompanying certificate of analysis should be followed.
Reversed-phase HPLC establishes purity, while mass spectrometry confirms the expected molecular mass. Sequence confirmation may use tandem mass spectrometry or peptide mapping. A certificate of analysis typically reports these results alongside the analytical method applied.
In Russia it is a registered medicine available by prescription. In many other countries it is not approved for human use and is supplied only as a research chemical. Import and possession rules differ by jurisdiction, and buyers are responsible for checking local requirements.
Selank is a synthetic heptapeptide designed as a stabilized analog of the natural tetrapeptide tuftsin. It has been investigated mainly for anxiolytic and cognitive effects. It is not an approved pharmaceutical in most countries.