The short version of Epitalon fits in a sentence. The long version — which is the one that helps — is below.
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Several names circulate for the same molecule, including epitalon, epithalone, epithalamin tetrapeptide, and the sequence code AEDG. A CAS registry number, 307297-39-8, is commonly cited for it, though catalogue entries should be checked against supplier documentation because mislabelled records occur. In its usual form the peptide carries free amino and carboxyl termini and is neither glycosylated nor lipidated. Researchers distinguish the defined tetrapeptide from epithalamin itself, a crude pineal preparation containing many peptides that is not chemically characterised.
Material supplied for laboratory use is normally a lyophilised white to off-white powder that dissolves readily in water and in isotonic saline. Lyophilised cakes are hygroscopic and should be equilibrated to room temperature before opening to limit condensation on the solid. Solutions are typically prepared at milligram-per-millilitre concentrations and divided into single-use aliquots, because repeated freeze–thaw cycles degrade short peptides. Aqueous solutions are far less stable than the dry powder, and identity is usually verified by mass spectrometry alongside purity estimation from reversed-phase high-performance liquid chromatography.
Epitalon is a synthetic linear tetrapeptide with the sequence alanine–glutamate–aspartate–glycine, abbreviated AEDG. Its molecular formula is C14H22N4O9 and the calculated mass is approximately 390.35 g/mol. The compound is made by solid-phase peptide synthesis rather than extracted from tissue, although early work described it as a short fragment of a peptide fraction obtained from bovine pineal extract. In the research literature the spelling epitalon and the variant epithalone both appear, while AEDG is the standard code used in peptide nomenclature.
The proposed relationship between epitalon and pineal function is a central part of its background. Khavinson's group reported that short peptides corresponding to regions of larger pineal proteins could influence gene expression in cells. Epitalon was framed as a synthetic analogue of an active fragment rather than a direct isolation product. Whether the tetrapeptide reproduces the effects of the parent extract is an open question, because comparative studies are limited and the parent extract itself is not a single defined substance.
Interest in epitalon is usually discussed within the broader field of short peptide bioregulators, a category that includes other synthetic di-, tri-, and tetrapeptides studied by the same research group. These compounds share a common rationale: that small fragments of tissue-derived proteins can retain biological activity and can be produced reproducibly. The category as a whole remains outside mainstream pharmacological consensus, and epitalon specifically has a limited presence in independent, non-Russian research literature, which shapes how its evidence base is described.
Epitalon is a synthetic tetrapeptide with the amino acid sequence alanine-glutamate-aspartate-glycine, abbreviated Ala-Glu-Asp-Gly or AEDG. It was developed by the Russian researcher Vladimir Khavinson and colleagues during work on peptide bioregulators derived from the pineal gland. The compound is short enough to be produced by standard solid-phase peptide synthesis and is typically handled as a lyophilized white powder. Its small size distinguishes it from larger pineal peptides such as epithalamin, a complex extract from which the tetrapeptide was conceptually derived.
| Property | Value | Notes |
|---|---|---|
| Amino acid sequence | Ala-Glu-Asp-Gly | Linear tetrapeptide, also written AEDG |
| Molecular mass | About 390.35 g/mol | Value calculated from the sequence |
| Appearance | White to off-white powder | Lyophilised material forms a loose cake |
| Solubility | Freely soluble in water | Also dissolves in isotonic saline |
| Storage | -20 °C, desiccated | Aliquot solutions to avoid freeze–thaw cycling |
Proposed mechanisms centre on cell-culture observations rather than a defined receptor interaction. Several reports describe increased expression of the telomerase catalytic subunit after exposure of cultured human cells, and the authors attributed the effect to short peptide fragments entering the nucleus and influencing gene transcription. No receptor for the tetrapeptide has been identified, and the free peptide is expected to be degraded rapidly by plasma peptidases. Whether any measurable fraction reaches intact tissues after administration remains an unresolved question rather than an established finding.
The published literature is dominated by a small number of research groups, much of it in Russian-language journals, and independent replication outside those groups is limited. Studies are typically small, use cultured cells or rodent models, and report endpoints that differ between papers, which makes comparison difficult. Large randomised human trials have not appeared in the indexed literature. Questions about absorption, distribution and clearance are therefore still treated as open in reviews that mention the compound.
Epitalon is a synthetic tetrapeptide whose sequence is alanine-glutamate-aspartate-glycine, written in single-letter code as AEDG. The four residues are joined by three peptide bonds, giving a linear backbone with no branching and no disulfide bridges. Its calculated molecular mass for the free form is approximately 390.3 daltons, a figure that rises when the compound is supplied as an acetate or trifluoroacetate salt. Because the chain is short, the molecule is defined entirely by its residue order rather than by any folded three-dimensional structure.
The compound is described in the literature as a derivative of epithalamin, a preparation obtained from bovine pineal tissue. Work on this peptide family was carried out mainly by a research group in Saint Petersburg beginning in the 1980s, and the substance was later registered for clinical use in Russia under the name Epitalon. Outside that region it is generally treated as a research chemical rather than an approved medicine. Statements about its biological activity rest on a relatively small number of studies, and independent replication remains limited.
The peptide emerged from research carried out in Saint Petersburg from the late 1980s onward, where investigators searched for shorter active fragments of a pineal preparation known as epithalamin. The name epitalon was chosen to reflect that parent extract. Early reports described effects on neuroendocrine markers and on the lifespan of laboratory animals. Much of that work appeared in Russian-language journals, with English translations following later, which affects how readily the original protocols can be assessed by outside groups.
Published studies on epitalon are dominated by a small number of research groups, and independent replication in other laboratories remains limited. Proposed mechanisms include activation of telomerase and modulation of melatonin rhythms, but the evidence for either rests mainly on cell cultures and animal models. Whether the peptide produces comparable effects in humans is an open question, and the absence of large controlled trials means the literature is best read as exploratory rather than settled.
Epitalon is a synthetic four-amino-acid peptide with the sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. Its molecular formula is C14H22N4O9, and its calculated molar mass is approximately 390.35 grams per mole. The compound is a short fragment related to a peptide fraction isolated from bovine pineal gland extracts, and it is normally supplied as a lyophilised powder intended for laboratory research. It is not a registered pharmaceutical product in most countries.
=== Europe === Dihydromorphine is regulated in the same fashion as morphine in Germany under the BtMG, Austrian SMG, and Swiss BtMG, where it is still used as an analgesic. The drug was invented in Germany in 1900 and marketed shortly thereafter. It is often used in Patient Controlled Analgesia units.
== Background == The album's title is taken from Heap's elliptical-shaped home in Essex, England wherein she began work on the project. The album's artwork was created using pictures from Flickr taken by fans. She composed and wrote all of the songs on the album prior to recording them in the studio, and recorded all of the vocals for the album in one month. During the making of the album, she frequently uploaded early studio mixes of its songs online in order to receive feedback from fans. In July 2009, a promotional copy of the album (designed by Andy Hau) appeared on eBay; Heap in return placed a bid of £10,000,000 to try to reclaim the album, which eBay rejected. As of 8 July, eBay had ended the auction. On 14 July, the first single "First Train Home" was released, and a digital pre-order for the album became available on iTunes in two versions. The deluxe version includes instrumental tracks of the entire album. Both standard and deluxe editions feature a "Behind the scenes" video when pre-ordered. As the song "The Fire" is already an instrumental, the "instrumental" version on the Deluxe edition's second disc consists of just the crackling fire in the background of the song proper. The solo piano track, without the fire sounds, was included only on the Deluxe CD copy of the album, as a hidden track at the end of "Half Life"; digital copies omit this hidden track. In Japan, the song "Not Now, But Soon" from the Heroes soundtrack was included as a bonus track.
Pre-formed mediators stored in granules biogenic amines (histamine, serotonin, dopamine) proteases (serine proteases including tryptase and chymase, aspartic acid proteases, cysteine proteases, metalloproteinases including CPA3) proteoglycans (heparin, chondroitin sulfate) cytokines (TNF, IL-4) growth factors (GM-CSF, bFGF, VEGF, NGF) lysosomal enzymes (β-hexosaminidase, β-glucuronidase, CD63) Newly synthesized inflammatory mediators lipid mediators (eicosanoids, thromboxane, LTB4, LTC4, PAF, PGD2) neuropeptides (CRH, VIP) growth factors (PDGF, GnRH) chemokines (MCP-1, eotaxin, TARC, RANTES) cytokines (IL-1, IL-3, IL-6, IL-18, SCF, TGF-β)
=== Comorbidity === Other psychological issues may factor into anorexia nervosa. Some pre-existing disorders can increase a person's likelihood to develop an eating disorder. Additionally, anorexia nervosa can contribute to the development of certain conditions. The presence of psychiatric comorbidity has been shown to affect the severity and type of anorexia nervosa symptoms in both adolescents and adults. Post-traumatic stress disorder remains highly prevalent among patients with anorexia nervosa, with more comorbid PTSD being associated with more severe eating disorder symptoms. Obsessive–compulsive disorder (OCD) and obsessive–compulsive personality disorder (OCPD) are highly comorbid with AN. OCD is linked with more severe symptomatology and worse prognosis. The causality between personality disorders and eating disorders has yet to be fully established. Other comorbid conditions include depression, alcoholism, substance abuse, borderline and other personality disorders, anxiety disorders, attention deficit hyperactivity disorder, and body dysmorphic disorder (BDD). Depression and anxiety are the most common comorbidities, and depression is associated with a worse outcome. Autism spectrum disorder occurs more commonly among people with eating disorders than in the general population, with about 30% of children and adults with AN likely having autism. Zucker et al. (2007) proposed that conditions on the autism spectrum make up the cognitive endophenotype underlying anorexia nervosa and appealed for increased interdisciplinary collaboration.
Double-A (officially Class AA) is the second-highest level of play in Minor League Baseball in the United States since 1946, below only Triple-A. There are 30 teams classified at the Double-A level, one for each team in Major League Baseball, organized into three leagues: the Eastern League, the Southern League, and the Texas League.
Sources: en.wikipedia.org
=== Boiling points and solubility === Thiols show little association by hydrogen bonding, both with water molecules and among themselves. Hence, they have lower boiling points and are less soluble in water and other polar solvents than alcohols of similar molecular weight. For this reason also, thiols and their corresponding sulfide functional group isomers have similar solubility characteristics and boiling points, whereas the same is not true of alcohols and their corresponding isomeric ethers.
== Beta turn prediction methods == Over the years, many beta turn prediction methods have been developed. Recently, Dr. Raghava's Group developed BetaTPred3 method which predicts a complete beta turn rather than individual residues falling into a beta turn. The method also achieves good accuracy and is the first method which predicts all 9 types of beta turns. Apart from prediction, this method can also be used to find the minimum number of mutations required to initiate or break a beta turn in a protein at a desired location.
== Sources == Bingham, Jonathan Brewster (1953). Shirt-Sleeve Diplomacy: Point 4 in Action. John Day & Co. Brown, William Adams Jr.; Opie, Redvers (1953). American Foreign Assistance. Washington, DC: The Brookings Institution. Butterfield, Samuel Hale (2004). U.S. Development Aid – An Historic First: Achievements and Failures in the Twentieth Century. Westport, CN: Praeger. ISBN 0-313-31910-3. Glick, Philip M. (1957). The Administration of Technical Assistance: Growth in the Americas. Chicago: University of Chicago Press. Haviland, H. Field (1958). "Foreign Aid and the Policy Process: 1957". The American Political Science Review. 52 (3): 689–724. doi:10.2307/1951900. JSTOR 1951900. S2CID 144564474. Hayes, Samuel J., ed. (1971). The Beginnings of American Aid to Southeast Asia: The Griffin Mission of 1950. Lexington, MA: Heath Lexington Books. Jolly, Richard; Emmerji, Louis; Ghai, Dharam; Lapeyre, Frederic (2004). UN Contributions to Development Thinking and Practice. Bloomington: Indiana University Press. Kaufman, B. Ira (1982). Trade and aid : Eisenhower's foreign economic policy, 1953–1961. Baltimore, MD: Johns Hopkins University Press. p. 82. ISBN 978-0-8018-2623-8. Nowels, Larry Q. (February 1987). Economic Security Assistance As a Tool of American Foreign Policy: The Current Dilemma and Future Options (PDF) (Report). National War College. Archived from the original (PDF) on 2017-10-11. Retrieved 2017-06-20 – via Development Experience Clearinghouse. Ruttan, Vernon W. (1996). United States Development Assistance Policy: The Domestic Politics of Foreign Economic Aid.
Rhodium is a fission product of uranium-235: each kilogram of fission product contains a significant amount of the lighter platinum group metals. Used nuclear fuel is therefore a potential source of rhodium, but the extraction is complex and expensive, and the presence of rhodium radioisotopes requires a period of cooling storage for multiple half-lives of the longest-lived isotope (101Rh with a half-life of 3.3 years, and 102mRh with a half-life of 2.9 years), or about 10 years. These factors make the source unattractive and no large-scale extraction has been attempted.
Sources: en.wikipedia.org
Nairobi Half Life (Swahili: Nusu Maisha ya Nairobi) is a 2012 Kenyan drama film directed by David "Tosh" Gitonga. The film was selected as the Kenyan entry for the Best Foreign Language Oscar at the 85th Academy Awards but did not make it to the final shortlist. It was the first time Kenya had submitted a film in this category. At the 33rd Durban International Film Festival, Joseph Wairimu won the award for Best Actor. He also won the Africa Movie Academy Award for Most Promising Actor from the Awards 9th ceremony. It won the most awards at Africa Magic Viewers Choice Awards 2014.
Other existing alpine glacial isotope records include Mount Kilimanjaro in Tanzania, Mount Altai and West Belukha Plateau in Russia, Mount Logan in Canada, the Fremont Glacier in Wyoming, USA, and the Illimani Ice Core in Bolivia, most of which cover an interval of the Holocene epoch.[3]
Surfactants are (usually organic) compounds that are amphiphilic, which means that this molecule each contains a hydrophilic "water-seeking" group (the head), and a hydrophobic "water-avoiding" group (the tail). As a result, a surfactant contains both a water-soluble component and a water-insoluble component. Surfactants diffuse in water and get adsorbed at interfaces between air and water, or at the interface between oil and water in the case where water is mixed with oil. The water-insoluble hydrophobic group may extend out of the bulk water phase into a non-water phase such as air or oil phase, while the water-soluble head group remains bound in the water phase. The hydrophobic tail may be either lipophilic ("oil-seeking") or lipophobic ("oil-avoiding") depending on its chemistry. Hydrocarbon groups are usually lipophilic, for use in soaps and detergents, while fluorocarbon groups are lipophobic, for use in repelling stains or reducing surface tension. World production of surfactants is estimated at 15 million tons per year, of which about half are soaps. Other surfactants produced on a particularly large scale are linear alkylbenzene sulfonates (1.7 million tons/y), lignin sulfonates (600,000 tons/y), fatty alcohol ethoxylates (700,000 tons/y), and alkylphenol ethoxylates (500,000 tons/y).
Sources: en.wikipedia.org
It is a synthetic tetrapeptide. Its sequence was derived from research on peptide fractions of bovine pineal extract, and the intact AEDG sequence has not been demonstrated as an abundant free peptide in human tissue.
AEDG is the one-letter code for the four amino acids alanine, glutamate, aspartate and glycine in that order. The same molecule is written in three-letter form as Ala-Glu-Asp-Gly.
Identity is normally confirmed by mass spectrometry against the calculated mass of roughly 390.35 g/mol. Purity is then estimated by reversed-phase high-performance liquid chromatography with ultraviolet detection.
Epitalon is a synthetic tetrapeptide composed of four amino acids: alanine, glutamate, aspartate, and glycine. It is written as Ala-Glu-Asp-Gly. The free peptide has a molecular weight of about 390 daltons and is normally supplied as a lyophilized powder.