Pro-Gly-Pro raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2025-08-20. Anything still debated is marked as such rather than presented as settled.
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.
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.
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.
Characterization of Selank in a laboratory setting relies on standard peptide methods. Reverse-phase high-performance liquid chromatography separates the target from related impurities and provides a purity figure, commonly reported as 95 percent or higher. Mass spectrometry, typically electrospray ionization or matrix-assisted laser desorption, confirms the molecular mass and helps detect truncation or modification. Amino acid analysis can verify composition when a sequence-level check is needed. These techniques together establish identity and purity for a given lot.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular class | Synthetic heptapeptide | Stabilized analog of tuftsin |
| Sequence | Thr-Lys-Pro-Arg-Pro-Gly-Pro | Single-letter form: TKPRPGP |
| Molecular formula | C33H57N11O9 | Monoisotopic mass about 751.9 Da |
| Appearance | White to off-white powder | Typically supplied as lyophilized solid |
| Solubility | Freely soluble in water | Also soluble in common polar solvents |
Measuring peptide exposure inside the brain is technically difficult. Selank is degraded rapidly in plasma, and assays must separate intact peptide from fragments, which favors targeted mass spectrometry over immunoassays alone. Reported half-lives are short, on the order of minutes, so effects observed hours later are attributed to downstream signaling rather than to the parent compound. Blood-brain barrier permeability is debated and rarely quantified directly. Gaps include absent dose-response characterization, inconsistent reporting of purity, and almost no pharmacokinetic data from human participants.
Selank is studied chiefly as an animal-model anxiolytic with proposed secondary effects on memory and immune signaling. Reported mechanisms include modulation of the GABA-A receptor complex, inhibition of enkephalin-degrading enzymes, and shifts in monoamine turnover within limbic structures. Some experiments describe increased expression of brain-derived neurotrophic factor in the hippocampus after repeated dosing. No single molecular target has been confirmed, and the peptide does not bind any receptor with the selectivity typical of a conventional small-molecule drug. Mechanism therefore remains a set of hypotheses rather than an established pathway.
Laboratory work relies on standard behavioral paradigms. Rodents are tested in the elevated plus maze, open field, and passive avoidance tasks, with outcomes compared against diazepam or vehicle controls. Intranasal dosing is used most often because it bypasses first-pass metabolism, though intraperitoneal and intravenous routes also appear in published protocols. Biochemical endpoints include tissue BDNF concentrations, cytokine levels, and monoamine metabolites. Human data are limited to small Russian trials reporting reduced anxiety scores; most were not prospectively registered, and few employed independent outcome assessment.
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.
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.
Clinical evidence comes mainly from small studies conducted in Russia, several of which were open-label or lacked robust blinding. Reported outcomes include lower anxiety scores, changes in attention measures, and effects on asthenic states following illness. Sample sizes are typically in the tens of participants, and independent replication outside the region is scarce. Reviews published in English generally note the limited methodological quality of the underlying trials. Whether the compound produces clinically meaningful effects under rigorous conditions remains unresolved.
Proposed mechanisms center on modulation of the GABA system, but no single molecular target has been confirmed. Rodent studies report changes in GABA-A receptor expression and in the turnover of serotonin, dopamine, and norepinephrine in several brain regions. Increases in brain-derived neurotrophic factor and its receptor have also been described after repeated administration. These findings come largely from animal models, and the degree to which they describe human neurochemistry remains an open question. The mechanism is best characterized as multi-system and not fully resolved.
Pharmacokinetic data are limited. Like most short peptides, Selank is vulnerable to plasma and tissue peptidases, and its measured half-life in circulation is short, on a minutes scale. The Pro-Gly-Pro tail slows this degradation but does not eliminate it. Intranasal administration is the route described in most reports, with absorption through the nasal mucosa and a hypothesized path into the central nervous system that avoids the blood-brain barrier. Direct measurements of human brain exposure are unavailable, so distribution claims rest on inference from animal work.
Most published work on selank originates from a small number of research groups in the Russian Federation. A large share of that record appears in Russian-language journals, which limits access for readers who rely on English-indexed databases. Independent replication by laboratories outside the original research network is sparse in publicly available sources. This concentration of origin and language is a frequently noted feature when the compound is summarized in broader reviews of synthetic peptides.
Reported pharmacological effects center on reduced anxiety-like behavior in animal models and on measures of memory and learning. Proposed contributing mechanisms include modulation of GABAergic signaling, shifts in monoamine turnover, and changes in the activity of enzymes that degrade neuropeptides. Effects on the expression of genes linked to neuroplasticity have also been described. No single molecular target is widely accepted, and whether the behavioral findings arise from one pathway or several remains an open question.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro. It was designed as a stabilized analogue of tuftsin, a naturally occurring tetrapeptide fragment derived from the immunoglobulin heavy chain. The additional Pro-Gly-Pro segment at the carboxyl terminus is intended to slow enzymatic cleavage. The compound is usually described in the literature as a synthetic peptide with anxiolytic and cognitive-related activity, a label that reflects a research context rather than an approved therapeutic category.
The main advantage of 60Co is that it is a high-intensity gamma-ray emitter with a relatively long half-life (over 5 years) compared to similar gamma-ray sources. The β-radiation is low-energy and easily shielded; however, the gamma rays are highly penetrating. The physical properties of cobalt such as resistance to bulk oxidation and low solubility in water give some advantages in safety in the case of a containment breach over some other gamma sources such as caesium-137. The main uses for 60Co are:
in a gathering or a date, are known as dining, and large dining events where many people are invited to eat food together are known as banquets or feasts. The craft of preparing and presenting meals for formal eating is called culinary arts, and the person performing such tasks is known as a cook, chef or cater depending on the respective nature of food service. Physicians and dieticians consider eating a healthy diet essential for maintaining peak physical condition. Some individuals may reduce their amount of dietary intake, which may be a result of a voluntary choice as part of dieting lifestyle or as fasting for reasons of religious food prohibition, abstinence or political protest (i.e. a hunger strike). Limited consumption or rationing may also be due to logistical reasons such as a food shortage or a famine, in which case it will lead to starvation and undernutrition. On the contrary, overeating and excessive intake of calories (overnutrition) may lead to obesity and associated health problems, and while the reasons behind it are myriad, its prevalence in the developed world has led some public health professionals to declare an "obesity epidemic".
The SAS raiding force, headed by Lieutenant-Colonel David Stirling, was discovered by an Italian reconnaissance unit, prompting Stirling to turn back to Kufra. The Rhodesians, meanwhile, were led into impassable country by a local guide, and swiftly retreated after being attacked by German bombers. Southern Rhodesian pilots played a part in the siege of Malta during 1942. John Plagis, a Rhodesian airman of Greek ancestry, joined the multinational group of Allied airmen defending the strategically important island in late March and on 1 April achieved four aerial victories in an afternoon, thereby becoming the siege's first Spitfire flying ace. By the time of his withdrawal in July he had been awarded the Distinguished Flying Cross twice. The British finally delivered vital supplies to Malta on 15 August with Operation Pedestal. Back in Salisbury, the Southern Rhodesian government was coming under pressure from Britain to put its armed forces under the purview of a regional command. Huggins decided in late October 1942 to join a unified Southern African Command headed by South Africa's Jan Smuts. This choice was motivated by a combination of strategic concerns and geopolitical manoeuvring. Apart from considering South Africa a more appropriate partner in geographical, logistical and cultural terms, Huggins feared that the alternative—joining the British East Africa Command—might detract from the autonomous nature of Southern Rhodesia's war effort, with possible constitutional implications. A shift in the deployment of the colony's troops duly occurred.
=== Pregnancy === Supplementation with a combination of vitamins E and C during pregnancy is not recommended by the World Health Organization. A Cochrane review concluded there was no support for the combination reducing risk of stillbirth, neonatal death, preterm birth, preeclampsia, or any other maternal or infant outcomes, either in healthy women or those considered at risk for pregnancy complications.
For services to the Care of Wildlife in Northumberland. Walter Wilson Ross, Conductor, Pension Silver Band, East Lothian. For services to Music. Charles Routledge, Dresser. For services to the Theatre. David Walton Routledge. For services to the community in Hillingdon, Middlesex. Harold Rowling. For services to the community in Westmeston, East Sussex. Shantilal Hirji Ruparell. For services to the community in Harrow, Middlesex. James Edwin Rous Saltonstall. For services to Yachting and to Young People. Anne Mary Sankaran. For services to the community in Oldham, Lancashire. Peter Saunders, Chairman, Groundwork Trust, Merthyr and Cynon. For services to the Environment. Alan Digerson Savage. For services to the Croydon Battle of Britain Memorial and to the Royal Air Force Benevolent Fund. John Robert Savage. For services to the community in Southwell, Nottinghamshire. Leslie Daniel Sayer, . For services to the Telegraphist Air Gunners' Association. Barry Scaplehorn, lately Firefighter, Suffolk County Fire Service. For services to the Fire Services Benevolent Fund. Susan Scarsbrook, Head, Sudbourne Primary School, Lambeth, London. For services to Education. David Andrew Seaman. For services to Association Football. Peter Jonathan Seaman, lately Chief Inspector, Hertfordshire Constabulary. For services to the Police. Sukumar Sen. For services to the community in Lochaber. Dorothy Sewell. For services to the community in Middlesbrough, North Yorkshire. Robert James Shaw. For services to the Fishing Industry. Patrick John Sherwin. For services to Coastal Rowing.
Sources: en.wikipedia.org
In 1953, scientists at the Sloan Kettering Institute in New York City demonstrated that cigarette tar painted on the skin of mice caused fatal cancers. This work attracted much media attention; the New York Times and Life both covered the issue. The Reader's Digest published an article entitled "Cancer by the Carton". On January 11, 1964, the United States Surgeon General's Report on Smoking and Health was published; this led millions of American smokers to quit, the banning of certain types of advertising, and required warning labels on tobacco products. These results were first widely accepted in the medical community and publicized among the general public in the mid-1960s. The medical community's resistance to the idea that smoking tobacco caused disease has been attributed to bias from nicotine-dependent doctors, the novelty of the adaptations needed to apply epidemiological techniques and heuristics to non-infectious diseases, and cigarette industry pressure. The harmful health effects of smoking have been significant for the development of the science of epidemiology. As the mechanism of carcinogenicity is radiomimetic or radiological, the effects are stochastic. Definite statements can be made only on the relatively increased or decreased probabilities of contracting a given disease. For a particular individual, it is impossible to definitively prove a direct causal link between exposure to a radiomimetic poison such as tobacco smoke and the cancer that follows; such statements can only be made at the aggregate population level.
The head of the Wagner Group, Yevgeny Prigozhin, said that he would withdraw his troops from Bakhmut after Russia's Victory Day on 10 May because of ammunition shortages, blaming the Russian military establishment. However, two days later he said he had "received a combat order" and had been promised all ammunition and weapons needed. Russia ordered a partial evacuation of civilians from 18 settlements of Zaporizhzhia Oblast near the Zaporizhzhia Nuclear Power Plant, including Enerhodar, citing increased shelling by the Ukrainian military. A Polish border guard aircraft on patrol for the European Union's border agency Frontex figured in a near-collision with a Russian Su-35 fighter jet in international waters over the Black Sea near Romania. A Polish official said that the Russian jet carried out "aggressive and dangerous manoeuvres" approaching the Polish aircraft without keeping a secure distance, leading to turbulence, loss of altitude and a temporary loss of control of the plane by the crew. Belarus implemented border controls with Russia for the first time since 1995, in what Foreign Minister Sergei Aleinik later said was part of efforts to avoid the entry of third-country nationals into the country but was seen by human rights organizations as an attempt to stem the escape of Russian dissidents and draft evaders.
Fe(II) + H2O2 → Fe(III)OH + HO· The Fenton reaction explains the toxicity of hydrogen peroxides because the hydroxyl radicals rapidly and irreversibly oxidize all organic compounds, including proteins, membrane lipids, and DNA. Hydrogen peroxide is a significant source of oxidative DNA damage in living cells. DNA damage includes formation of 8-Oxo-2'-deoxyguanosine among many other altered bases, as well as strand breaks, inter-strand crosslinks, and deoxyribose damage. By interacting with Cl−, hydrogen peroxide also leads to chlorinated DNA bases. Hydroxyl radicals readily damage vital cellular components, especially those of the mitochondria. The compound is a major factor implicated in the free-radical theory of aging, based on its ready conversion into a hydroxyl radical.
=== ISCEA Expansion into Asia-Pacific === ISCEA has been supporting supply chain education and providing with certification in the Asia-Pacific region since 2007. Some countries in APAC in which supply chain professionals are acquiring their supply chain certification credentials from ISCEA include India, Pakistan, Bangladesh Indonesia,
Salting is the preservation of food with dry edible salt. It is related to pickling (preparing food with brine, i.e. salty water), and is one of the oldest methods of preserving food. Salt inhibits the growth of microorganisms by drawing water out of microbial cells through osmosis. Concentrations of salt up to 20% are required to kill most species of unwanted bacteria. Smoking, often used in the process of curing meat, adds chemicals to the surface of meat that reduce the concentration of salt required. Salting is used because most bacteria, fungi and other potentially pathogenic organisms cannot survive in a highly salty environment, due to the hypertonic nature of salt. Any living cell in such an environment will become dehydrated through osmosis and die or become temporarily inactivated. The water activity, aw, in a fish is defined as the ratio of the water vapour pressure in the flesh of the fish to the vapour pressure of pure water at the same temperature and pressure. It ranges between 0 and 1, and is a parameter that measures how available the water is in the flesh of the fish. Available water is necessary for the microbial and enzymatic reactions involved in spoilage. There are a number of techniques that have been or are used to tie up the available water or remove it by reducing the aw. Traditionally, techniques such as drying, salting and smoking have been used, and have been used for thousands of years. In more recent times, freeze-drying, water binding humectants, and fully automated equipment with temperature and humidity control have been added.
Sources: en.wikipedia.org
Wallerian degeneration is an active process of degeneration that results when a nerve fiber is cut or crushed and the part of the axon distal to the injury (which in most cases is farther from the neuron's cell body) degenerates. A related process of dying back or retrograde degeneration known as 'Wallerian-like degeneration' occurs in many neurodegenerative diseases, especially those where axonal transport is impaired such as amyotrophic lateral sclerosis (ALS) and Alzheimer's disease. Primary culture studies suggest that a failure to deliver sufficient quantities of the essential axonal protein NMNAT2 is a key initiating event. Some studies also have found irreversible electroporation, a potential clinical treatment being researched in porcine models to determine efficacy to treat spinal cord injuries, has contributed to Wallerian degeneration of lumbar nerve roots. Wallerian degeneration occurs after axonal injury in both the peripheral nervous system (PNS) and central nervous system (CNS). It occurs in the section of the axon distal to the site of injury and usually begins within 24–36 hours of a lesion. Prior to degeneration, the distal section of the axon tends to remain electrically excitable. After injury, the axonal skeleton disintegrates, and the axonal membrane breaks apart. Axonal degeneration is followed by degradation of the myelin sheath and infiltration by macrophages. The macrophages, accompanied by Schwann cells, serve to clear the debris from the degeneration.
vacuole Any of a class of enclosed, fluid-filled compartments present in many eukaryotic cells as well as bacteria, often large and conspicuous under the microscope and serving any of a huge variety of functions, including acting as a resizable reservoir for the storage of water, metabolic waste, toxins, or foreign material; maintaining cellular homeostasis and hydrostatic pressure; supporting immune functions; housing symbiotic bacteria; and assisting in the degradation and recycling of old cellular components.
== Louisiana Secretary of Revenue (1996–1999) == Following his first stint in state government, Kennedy returned to private law practice until 1996. That year, he was appointed secretary of the state Department of Revenue in the cabinet of Governor Mike Foster. Despite having political differences with Kennedy during his time in Roemer's administration, Foster selected Kennedy for the position and later endorsed him for the U.S. Senate. Kennedy stepped down as secretary in April 1999 and was replaced by Brett Crawford.
has recently been having a certain vogue, probably not unconnected with the fact that it makes the custodial care of many patients easier. Let me remark in passing that killing them makes their custodial care still easier." Concerns about lobotomy steadily grew. Soviet psychiatrist Vasily Gilyarovsky criticized lobotomy and the mechanistic brain localization assumption used to carry out lobotomy:
the post void residual volume (PVR, ml) was significantly decreased the maximum urinary flow (Qmax, ml/s) was increased the voiding time (VT, s) was decreased This urodynamic profile is related to a lower risk of urologic complications, such as cystitis and bladder stones.
Sources: en.wikipedia.org
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.
It was developed in Russia, at the Institute of Molecular Genetics of the Russian Academy of Sciences, during the 1990s. Most published research originates from Russian institutions. Independent international replication remains limited.
Tuftsin is a natural tetrapeptide with the sequence Thr-Lys-Pro-Arg that participates in immune signaling. Selank extends that sequence with Pro-Gly-Pro at the C-terminus. The added residues are linked to greater resistance to enzymatic breakdown.
Reverse-phase HPLC is the usual method and gives a percentage purity value. Mass spectrometry then confirms the molecular mass. Together they provide a basic identity and purity profile for a lot.