Lyophilisation raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2026-06-26. Anything still debated is marked as such rather than presented as settled.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Principal proposed target | GABA-A receptor complex | Hypothesis derived mainly from animal pharmacology |
| Common behavioral assay | Elevated plus maze | Rodent test for anxiety-like behavior |
| Reported molecular marker | Hippocampal BDNF expression | Measured by immunoassay or mRNA quantification |
| Typical dosing route | Intranasal | Chosen to reduce first-pass metabolism |
| Reported plasma half-life | Minutes | Based on limited peptide stability data |
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.
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.
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.
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.
Other bands that have been influenced by Alice in Chains include 10 Years, Avenged Sevenfold, Breaking Benjamin, Bush, Creed, Dallas Green, Days of the New, Disturbed, Hoobastank, Incubus, Korn, Manic Street Preachers, Mudvayne, Nickelback, A Pale Horse Named Death, Puddle of Mudd, Queens of the Stone Age, Rains, Seether, Skunk Anansie, Smile Empty Soul, Stone Sour, Tantric, Taproot, and Theory of a Deadman. Metallica said they have always wanted to tour with the band, citing Alice in Chains as a major inspiration for their 2008 release, Death Magnetic. Alice in Chains has also had a significant influence on modern heavy metal. Their songs were covered by various metal bands such as In Flames, Opeth, Dream Theater, Secrets of the Moon, Suicide Silence, 36 Crazyfists, Cane Hill, Ektomorf, Dritt Skitt, Grave and Thou, who described their 2018 EP Rhea Sylvia as "a melodic grunge, Alice in Chains homage." In 2009, Anders Fridén of Swedish melodic death metal band In Flames cited Layne Staley as an inspiration for his vocals on the band's later albums. In addition to fellow musicians, the band has also received praise from critics, with Steve Huey calling them "one of the best metal bands of the '90s" upon reviewing the 1999 compilation Nothing Safe. In 2009, the Vitamin String Quartet released the album The String Quartet Tribute to Alice in Chains, featuring instrumental versions on viola, violin and cello of 12 of the band's biggest hits.
=== 1960s === During the 1960s, the main conflict in Colombia was between leftist guerillas and the central government. Key concerns included access to land, the battle between communist and far-right ideologies, and the marginalization of peasant populations. In the early 1960s, Colombian Army units loyal to the National Front began to attack peasant communities. This happened throughout Colombia, with the Colombian army deeming these peasant communities as enclaves for bandits and communists. It was the 1964 attack on the community of Marquetalia that motivated the later creation of FARC. Despite the infantry and police encirclement of the villages inside Marquetalia (3,500 men swept through the area), Manuel Marulanda managed to escape the army cordon. Unlike the rural FARC, which had roots in previous Liberal peasant struggles, the National Liberation Army (ELN) was mostly an outgrowth of university unrest. It would subsequently tend to follow a small group of charismatic leaders, including Camilo Torres Restrepo. Both guerrilla groups remained mostly operational in remote areas of the country during the rest of the 1960s. The Colombian government organized several short-lived counter-guerrilla campaigns in the late 1950s and early 1960s. The U.S. government and the CIA aided these efforts, which employed hunter-killer teams and involved U.S. personnel from the previous Philippine campaign against the Huks, who would later participate in the subsequent Phoenix Program in the Vietnam War.
Founded in 1896 by Fritz Hoffmann-La Roche, the company was known early on for producing various vitamin preparations and derivatives. In 1934, it became the first company to mass-produce synthetic vitamin C, under the brand name Redoxon. During the Second World War, Roche collaborated with the Nazi regime in Germany and used forced labour in its German and Polish-based factories. It also moved all its Jewish employees to the United States to save them from Nazi attention. In 1957, Hoffmann-La Roche introduced the class of tranquilizers known as benzodiazepines (with Valium and Rohypnol being the best known members). It manufactures and sells several cancer drugs and is a leader in this field. In 1956, the first antidepressant, iproniazid, was accidentally created during an experiment while synthesizing isoniazid. Originally, it had been intended to create a more efficient drug at combatting tuberculosis. Iproniazid, however, was revealed to have its own benefits; some people felt it made them feel happier. It was withdrawn from the market in the early 1960s due to toxic side-effects. In 1976, an accident at a chemical factory in Seveso, Italy, owned by a subsidiary of Roche, caused a large dioxin contamination. In 1982, the United States arm of the company acquired Biomedical Reference Laboratories for US$163.5 million. That company dated from the late 1960s, and was located in Burlington, North Carolina. That year Hoffmann-La Roche then merged it with all of its laboratories, and incorporated the merged company as Roche Biomedical Laboratories, Inc. in Burlington.
Sources: en.wikipedia.org
The human population exploits a large number of other animal species for food, both of domesticated livestock species in animal husbandry and, mainly at sea, by hunting wild species. Marine fish of many species are caught commercially for food. A smaller number of species are farmed commercially. Humans and their livestock make up more than 90% of the biomass of all terrestrial vertebrates, and almost as much as all insects combined. Invertebrates including cephalopods, crustaceans, insects—principally bees and silkworms—and bivalve or gastropod molluscs are hunted or farmed for food, fibres. Chickens, cattle, sheep, pigs, and other animals are raised as livestock for meat across the world. Animal fibres such as wool and silk are used to make textiles, while animal sinews have been used as lashings and bindings, and leather is widely used to make shoes and other items. Animals have been hunted and farmed for their fur to make items such as coats and hats. Dyestuffs including carmine (cochineal), shellac, and kermes have been made from the bodies of insects. Working animals including cattle and horses have been used for work and transport from the first days of agriculture. Animals such as the fruit fly Drosophila melanogaster serve a major role in science as experimental models. Animals have been used to create vaccines since their discovery in the 18th century. Some medicines such as the cancer drug trabectedin are based on toxins or other molecules of animal origin.
All known isotopes of curium are radioactive and have small critical mass for a nuclear chain reaction. The most stable isotope, 247Cm, has a half-life of 15.6 million years; the longest-lived curium isotopes predominantly emit alpha particles. Radioisotope thermoelectric generators can use the heat from this process, but this is hindered by the rarity and high cost of curium. Curium is used in making heavier actinides and the 238Pu radionuclide for power sources in artificial cardiac pacemakers and RTGs for spacecraft. It served as the α-source in the alpha particle X-ray spectrometers of several space probes, including the Sojourner, Spirit, Opportunity, and Curiosity Mars rovers and the Philae lander on comet 67P/Churyumov–Gerasimenko, to analyze the composition and structure of the surface.
Specialty drugs, a recent classification of pharmaceuticals, are high-cost drugs that are often biologics. The European Medicines Agency uses the term advanced therapy medicinal products (ATMPs) for medicines for human use that are "based on genes, cells, or tissue engineering", including gene therapy medicines, somatic-cell therapy medicines, tissue-engineered medicines, and combinations thereof. Within EMA contexts, the term advanced therapies refers specifically to ATMPs, although that term is rather nonspecific outside those contexts. Gene-based and cellular biologics, for example, often are at the forefront of biomedicine and biomedical research, and may be used to treat a variety of medical conditions for which no other treatments are available. Building on the market approvals and sales of recombinant virus-based biopharmaceuticals for veterinary and human medicine, the use of engineered plant viruses has been proposed to enhance crop performance and promote sustainable production. In some jurisdictions, biologics are regulated via different pathways from other small molecule drugs and medical devices.
Sources: en.wikipedia.org
Casein kinase I isoform delta also known as CKI-delta or CK1δ is an enzyme that in humans is encoded by the gene CSNK1D, which is located on chromosome 17 (17q25.3). It is a member of the CK1 (formerly named casein kinase 1) family of serine/threonine specific eukaryotic protein kinases encompassing seven distinct isoforms (CK1α, γ1-3, δ, ε) as well as various post-transcriptionally processed splice variants (transcription variants, TVs) in mammalians. Meanwhile, CK1δ homologous proteins have been isolated from organisms like yeast, basidiomycetes, plants, algae, and protozoa.
Naram-Sin was a son of Manishtushu. He was thus a nephew of King Rimush and grandson of Sargon and Tashlultum. Naram-Sin's aunt was the High Priestess Enheduanna. Most recensions of the Sumerian King List show him following Manishtushu but the Ur III version of the king list inverts the order of Rimush and Manishtushu. To be fully correct, rather than Naram-Sin or Naram-Suen "in Old Akkadian, the name in question should rather be reconstructed as Naram-Suyin (more precisely, /narām-tsuyin/) or Naram-Suʾin (/narām-tsuʾin/)".
We were of course glad to meet again and became close friends. On my side feelings developed gradually over the next two years. He seemed to have made his mind up much more quickly, however, and became even more keen when, in the autumn of 1910, rumours spread about that I had got engaged to a distant Spanish relative, Don Jaime, the Duke of Madrid. On hearing this, the Archduke came down post haste from his regiment at Brandýs and sought out his grandmother, Archduchess Maria Theresa, who was also my aunt and the natural confidante in such matters. He asked if the rumor was true and when told it was not, he replied, "Well, I had better hurry in any case or she will get engaged to someone else." Archduke Charles traveled to Villa Pianore and asked for Zita's hand and, on 13 June 1911, their engagement was announced at the Austrian court. Zita in later years recalled that after her engagement she had expressed to Charles her worries about the fate of the Austrian Empire and the challenges of the monarchy. Charles and Zita were married at the Schwarzau castle on 21 October 1911. Charles's great-uncle, the 81-year-old Emperor Franz Joseph I, attended the wedding. He was relieved to see an heir make a suitable marriage, and was in good spirits, even leading the toast at the wedding breakfast. Archduchess Zita soon conceived a son, and Otto was born on 20 November 1912. Seven more children followed in the next decade.
== Physical appearance == Wild type fruit flies are yellow-brown, with brick-red eyes and transverse black rings across the abdomen. The fly's body is divided into three main parts: head, thorax, and abdomen. The head is relatively round and features large, prominent red compound eyes. These eyes are made up of hundreds of ommatidia and occupy most of the head's surface. The brick-red color of the eyes of the wild type fly are due to two pigments: xanthommatin, which is brown and is derived from tryptophan, and drosopterins, which are red and are derived from guanosine triphosphate. Between the eyes are short antennae, which look like tiny feathery or bristled projections and are used for detecting odors, air currents, and vibrations. Drosophila also has bristles—short, stiff hairs—distributed across the head and body, which are useful for tactile sensing.
Sources: en.wikipedia.org
Intranasal administration predominates in both animal and human research because it avoids hepatic first-pass metabolism. Injectable and intraperitoneal routes appear in animal work mainly for comparison.
Behavioral endpoints include time spent in open arms of the elevated plus maze and avoidance latencies. Biochemical endpoints include BDNF concentration, cytokine levels, and monoamine metabolite ratios in brain tissue.
Most published studies are small, originate from a limited number of laboratories, and lack independent replication. Dose-response relationships, measured brain exposure, and long-term outcomes are not well characterized.
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.