Everything below concerns selank. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2025-09-20. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Route studied | Intranasal | Predominant route in published reports |
| Circulation stability | Short, minutes scale | Peptidases cleave it; the tail slows the process |
| Analytical method | RP-HPLC with mass spectrometry | Used for identity and purity assessment |
| Reported outcome domains | Anxiety and cognitive measures | Derived from small, mostly regional trials |
| Regulatory status | Marketed in Russia | Availability outside that market is limited |
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.
Quality assessment of Selank samples typically combines purity determination with identity confirmation and counter-ion analysis. Purity is usually reported as a percentage by chromatographic area, with values above 95 percent often quoted for research-grade material. Water content and residual solvents are checked in lyophilized batches because they affect both stability and accurate mass determination. A reported purity figure does not by itself establish that a sample is the intended sequence, so orthogonal methods are needed to rule out sequence isomers or truncation products.
Characterization of Selank in laboratory settings relies on standard peptide analytical techniques. Reverse-phase high-performance liquid chromatography separates the peptide from related impurities and degradation products, while mass spectrometry confirms molecular identity through accurate mass measurement. Amino acid analysis and peptide sequencing verify the primary structure when reference material is unavailable. Because Selank is a short chain, fragmentation-based analysis produces a diagnostic ion pattern that supports confident identification.
Peptide stability depends strongly on temperature, moisture, and pH. Lyophilized Selank is generally most stable when stored cold and dry, with freezer temperatures commonly used for long-term storage. In solution, the compound is susceptible to hydrolysis and to microbial growth if it is not handled aseptically. The C-terminal proline-rich extension appears to slow enzymatic cleavage relative to tuftsin, though quantitative degradation rates vary with the matrix and the conditions tested. Published stability data specific to Selank remain sparse.
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.
== Management == Oxygen therapy may assist with daily living. In case of idiopathic pulmonary fibrosis, certain medications like nintedanib and pirfenidone can help slow the progression. Lastly, lung transplants may help.
In November 2018, Cava Group bought Zoës Kitchen, a restaurant chain with more than 250 locations, in a deal worth $300 million, taking the company private and helping Cava expand further into the suburbs. As of August 2021, there were 133 Cava locations. All Cava restaurants are company-owned, and none are franchised. In 2020, Cava Group converted seven of its Zoës Kitchen locations to Cava-branded restaurants, with plans to convert 50 more in 2021. It has additional off-premises and digital kitchens dedicated to preparing food for online orders. As of May 2026, Cava operated 474 restaurant locations in the United States.
It also plays an important role in fine motor control; Parkinson's disease has been linked to low levels of dopamine due to the loss of dopaminergic neurons in substantia nigra pars compacta. Schizophrenia, a highly heterogeneous and complicated disorder has been linked to high levels of dopamine. Serotonin is a monoamine neurotransmitter. Most of it is produced by the intestine (approximately 90%), and the remainder by central nervous system neurons at the raphe nuclei. It functions to regulate appetite, sleep, memory and learning, temperature, mood, behaviour, muscle contraction, and the functions of the cardiovascular system and endocrine system. It is speculated to have a role in depression, as some depressed patients have been reported to exhibit lower concentrations of metabolites of serotonin in their cerebrospinal fluid and brain tissue. Norepinephrine is a member of the catecholamine family of neurotransmitters. It is synthesized from the amino acid tyrosine. In the peripheral nervous system, one of the primary roles of norepinephrine is to stimulate the release of the stress hormone epinephrine (i.e. adrenaline) from the adrenal glands. Norepinephrine is involved in the fight-or-flight response and is also affected in anxiety disorders and depression. Epinephrine, a neurotransmitter and hormone is synthesized from tyrosine. It is released from the adrenal glands and also plays a role in the fight-or-flight response. Epinephrine has vasoconstrictive effects, which promote increased heart rate, blood pressure, energy mobilization.
Sources: en.wikipedia.org
=== Leon Carp === Leon Carp is played by Martin Mull. Leon, originally as Roseanne's boss at Rodbell's Luncheonette and later as her business partner in The Lanford Lunchbox, he is portrayed as a foe to Roseanne; although they have a contentious relationship at times, Leon gradually becomes a close friend of the Conners, ultimately becoming a surrogate family member. As a gay man, he is occasionally seen dating many men and having romantic troubles; however, he later marries his life partner Scott (Fred Willard) in a very public ceremony. In the ninth season, they visit the Conner residence bearing gifts for Darlene and David's new baby, Harris, proclaiming themselves as the infant's Aunt Scott and Aunt Leon. Near the end of the episode, they announce their plans to adopt a little girl. Leon's role in the series expands significantly in the eighth and ninth seasons, as he is featured in more episodes. He is especially upset when Roseanne wins the lottery, but Roseanne and Jackie end up relinquishing control of the restaurant to Leon and Nancy. Leon is a Republican, and holds George Bush in high regard. He also is shown throughout the series' run to be a fan of Liza Minnelli, as well as Broadway musicals. Leon did not appear in season 10, nor did he appear on the spin-off series.
== Structure == Peptoid oligomers are known to be conformationally unstable, due to the flexibility of the main-chain methylene groups and the absence of stabilizing hydrogen bond interactions along the backbone. Nevertheless, through the choice of appropriate side chains it is possible to form specific steric or electronic interactions that favour the formation of stable secondary structures like helices, especially peptoids with C-α-branched side chains are known to adopt structure analogous to polyproline I helix. Different strategies have been employed to predict and characterize peptoid secondary structure, with the ultimate goal of developing fully folded peptoid protein structures The cis/trans amide bond isomerization still leads to a conformational heterogeneity which doesn’t allow for the formation of homogeneous peptoid foldamers. Nonetheless, scientists were able to find trans-inducer N-Aryl side chains promoting polyproline type II helix, and strong cis-inducer such as bulky naphtylethyl and tert-butyl side chains. It was also found that n→π* interactions can modulate the ratio of cis/trans amide bond conformers, until reaching a complete control of the cis conformer in the peptoid backbone using a functionalizable triazolium side chain.
== Activation == MOR can mediate acute changes in neuronal excitability via suppression of presynaptic release of GABA. Activation of the MOR leads to different effects on dendritic spines depending upon the agonist, and may be an example of functional selectivity at the μ-receptor. The physiological and pathological roles of these two distinct mechanisms remain to be clarified. Perhaps, both might be involved in opioid addiction and opioid-induced deficits in cognition. Activation of the μ-opioid receptor by an agonist such as morphine causes analgesia, sedation, slightly reduced blood pressure, itching, nausea, euphoria, decreased respiration, miosis (constricted pupils), and decreased bowel motility often leading to constipation. Some of these effects, such as analgesia, sedation, euphoria, itching and decreased respiration, tend to lessen with continued use as tolerance develops. Miosis and reduced bowel motility tend to persist; little tolerance develops to these effects. The canonical MOR1 isoform is responsible for morphine-induced analgesia, whereas the alternatively spliced MOR1D isoform (through heterodimerization with the gastrin-releasing peptide receptor) is required for morphine-induced itching.
=== 16 April === Ukraine and Russia conducted an Orthodox Easter prisoner swap. Some one hundred and thirty Ukrainian POWs were returned to Ukraine in exchange for an unknown number of Russian soldiers. Ukrainian officials said that the remains of some eighty-two deceased Ukrainian soldiers were retrieved from territory controlled by Russia. Chinese defense minister Li Shangfu met with Putin amid reports of Ukrainian forces finding an increasing number of Chinese components in Russian weapons, and leaked classified documents from the United States about China's alleged plans to covertly supply Russia with weapons.
Sources: en.wikipedia.org
Mepiprazole (INN, BAN; brand name Psigodal) is an anxiolytic drug of the phenylpiperazine group with additional antidepressant properties that is marketed in Spain. It acts as a 5-HT2A and α1-adrenergic receptor antagonist and inhibits the reuptake and induces the release of serotonin, dopamine, and norepinephrine to varying extents, and has been described as a serotonin antagonist and reuptake inhibitor (SARI).
In May 2016, PD-L1 inhibitor atezolizumab was approved for treating bladder cancer. Anti-PD-L1 antibodies currently in development include avelumab and durvalumab, in addition to an inhibitory affimer.
=== Foreign policy === Although they lead a comfortable life within the Culture, many of its citizens feel a need to be useful and to belong to a society that does not merely exist for their own sake but that also helps improve the lot of sentient beings throughout the galaxy. For that reason the Culture carries out "good works", covertly or overtly interfering in the development of lesser civilisations, with the main aim to gradually guide them towards less damaging paths. As Culture citizens see it, these good works provide the Culture with a "moral right to exist". A group within the Culture, known as Contact, is responsible for its interactions (diplomatic or otherwise) with other civilisations. Non-Contact citizens are apparently not prevented from travelling or interacting with other civilisations, though the effort and potential danger involved in doing so alone makes it much more commonly the case for Culture people simply to join Contact if they long to "see the world". Further within Contact, an intelligence organisation named Special Circumstances exists to deal with interventions which require more covert behaviour; the interventionist approach that the Culture takes to advancing other societies may often create resentment in the affected civilisations and thus requires a rather delicate touch (see: Look to Windward). In Matter, it is described that there are a number of other galactic civilisations that come close to or potentially even surpass the Culture in power and sophistication.
ELGA LabWater is the laboratory water brand name of Veolia Water Solutions & Technologies. ELGA manufactures, supplies and services water purification systems for use in general, R&D, healthcare and clinical laboratories. Its offices and distributors are located in more than 60 countries.
The energy in sunlight is captured by plants, cyanobacteria, purple bacteria, green sulfur bacteria and some protists. This process is often coupled to the conversion of carbon dioxide into organic compounds, as part of photosynthesis, which is discussed below. The energy capture and carbon fixation systems can, however, operate separately in prokaryotes, as purple bacteria and green sulfur bacteria can use sunlight as a source of energy, while switching between carbon fixation and the fermentation of organic compounds. In many organisms, the capture of solar energy is similar in principle to oxidative phosphorylation, as it involves the storage of energy as a proton concentration gradient. This proton motive force then drives ATP synthesis. The electrons needed to drive this electron transport chain come from light-gathering proteins called photosynthetic reaction centres. Reaction centers are classified into two types depending on the nature of photosynthetic pigment present, with most photosynthetic bacteria only having one type, while plants and cyanobacteria have two. In plants, algae, and cyanobacteria, photosystem II uses light energy to remove electrons from water, releasing oxygen as a waste product. The electrons then flow to the cytochrome b6f complex, which uses their energy to pump protons across the thylakoid membrane in the chloroplast. These protons move back through the membrane as they drive the ATP synthase, as before. The electrons then flow through photosystem I and can then be used to reduce the coenzyme NADP+.
Sources: en.wikipedia.org
Reports describe effects on GABA-A receptor expression, monoamine turnover, and neurotrophic factor levels. These are proposed mechanisms drawn mainly from animal models. No single molecular target has been established.
Intranasal delivery is the route described in most published work. It is used because the peptide is degraded quickly once it reaches circulation. Direct evidence of brain penetration in humans is lacking.
Most trials are small, regionally concentrated, and often lack rigorous blinding or placebo control. Independent replication is limited. Reviews in English generally rate the evidence as preliminary.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro, designed as a metabolically stabilized analogue of the endogenous tetrapeptide tuftsin. It has been studied mainly against anxiety-related and cognitive endpoints rather than as an approved medicine in most jurisdictions.