If you have been reading about epitalon and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2026-06-30. Where a claim depends on a specific study, the study is described rather than over-claimed.
The peptide is a synthetic analogue of epithalamin, a preparation extracted from bovine pineal glands. Investigators sought a short, chemically defined molecule that would reproduce some of the endocrine and gerontological observations attributed to the glandular extract. Proposed mechanisms centre on induction of telomerase activity, an effect reported in cultured human somatic cells in the early 2000s, together with influences on melatonin secretion and neuroendocrine regulation. Those mechanisms remain incompletely characterised, and the reported telomerase response has not been consistently reproduced by independent groups working in comparable systems.
Published work on this compound consists mainly of in vitro experiments, animal studies, and small clinical investigations, a substantial share of which appeared in Russian-language journals. Sample sizes are generally small, control conditions differ between studies, and several endpoints rely on markers whose clinical meaning is itself debated. Reviews of the longevity field treat the peptide as an early example of telomerase-directed research rather than an established intervention. Regulatory treatment varies by country: some jurisdictions place it under prescription controls, others treat it as a laboratory material, and importation may be restricted regardless of local status.
Residue composition is the property that most cleanly separates verified material from mislabelled samples. Alanine, glutamate, aspartate and glycine appear in that order from the N-terminus, and the two acidic residues sit in the middle of the chain. Because the peptide is short, it can be produced by solid-phase synthesis and characterised by mass spectrometry without ambiguity. Any reported sample whose measured mass departs substantially from 390 daltons is a different compound or a degraded mixture rather than epitalon.
Epitalon is a synthetic tetrapeptide whose four residues are alanine, glutamate, aspartate and glycine, commonly abbreviated AEDG. Its molecular formula is C14H22N4O9 and its monoisotopic mass is near 390.35 daltons. The peptide carries two acidic side chains, so it is neutral to negatively charged in most aqueous buffers. Published reference summaries usually list it under both spellings, epitalon and epithalon, and treat the two names as the same material.
| Property | Value | Notes |
|---|---|---|
| Peptide sequence | Ala-Glu-Asp-Gly | Often abbreviated AEDG in research literature |
| Common synonyms | Epithalon, epitalon, AEDG | Spelling variants refer to the same tetrapeptide |
| Molecular formula | C14H22N4O9 | Theoretical monoisotopic mass near 390.35 Da |
| Appearance | White to off-white powder | Typically supplied as a lyophilised solid |
| Solubility class | Freely soluble in water | Hydrophilic peptide; dissolves in aqueous buffer |
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.
In its supplied form epitalon is a white to off-white powder, usually lyophilized and often hygroscopic. It dissolves readily in water and in aqueous buffers, and it is commonly handled as the acetate or trifluoroacetate salt to improve stability during purification and drying. The amide backbone is labile in aqueous media, so solutions are less durable than the dry solid. Handling notes in the chemical literature therefore emphasize keeping the powder dry, cool and shielded from light until it is dissolved.
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.
This detector works only for organic / hydrocarbon containing compounds due to the ability of the carbons to form cations and electrons upon pyrolysis which generates a current between the electrodes. The increase in current is translated and appears as a peak in a chromatogram. FIDs have low detection limits (a few picograms per second) but they are unable to generate ions from carbonyl containing carbons. FID compatible carrier gasses include helium, hydrogen, nitrogen, and argon. In FID, sometimes the stream is modified before entering the detector. A methanizer converts carbon monoxide and carbon dioxide into methane so that it can be detected. A different technology is the polyarc, by Activated Research Inc, that converts all compounds to methane. Alkali flame detector (AFD) or alkali flame ionization detector (AFID) has high sensitivity to nitrogen and phosphorus, similar to NPD. However, the alkaline metal ions are supplied with the hydrogen gas, rather than a bead above the flame. For this reason AFD does not suffer the "fatigue" of the NPD, but provides a constant sensitivity over long period of time. In addition, when alkali ions are not added to the flame, AFD operates like a standard FID. A catalytic combustion detector (CCD) measures combustible hydrocarbons and hydrogen. Discharge ionization detector (DID) uses a high-voltage electric discharge to produce ions. Flame photometric detector (FPD) uses a photomultiplier tube to detect spectral lines of the compounds as they are burned in a flame.
Many items denoting 'rank and prestige' were deposited in the water surrounding Flag Fen, including swords, spearheads, 'gold earrings, tiny pins and brooches'. Archaeologist Francis Pryor, who discovered the site in 1982, suggests that 'settlers often vied for social status by showing they could afford to discard valuable possessions'. There is also evidence of intentional destruction before placement, e.g. daggers broken in half placed on top of each other. Other finds included small, polished, white stones of a type not known in the area, indicating that they had been intentionally collected and transported to and placed at the site. Other artefacts found were animal bones, including horse mandibles. Horses were very valuable to the prehistoric people, since they provided a means of transport and could supplement or replace man-power. For example, they could be used to carry or pull timbers on sledges over long distances. Significance is also drawn from the discovery of the ritual deposits within thirty metres of the timber post line, and only on its southern boundary. The amount, type, and placement of deposits, which continued for more than 1,200 years, support the theory that 'at least one facet of the site' was a role as a 'religious monument'. On Northey Island many round barrows contemporary with Flag Fen were found. These seemed to be constructed over the dwellings of 'chiefs'. Mike Parker Pearson refers to this as the "Land of the Dead". There is also evidence of farming, including sheep remains, contemporary with the site.
Gymnema sylvestre is a perennial woody vine native to Asia (including the Arabian Peninsula), Africa and Australia. It has been used in Ayurvedic medicine. Common names include gymnema, Australian cowplant, and Periploca of the woods, and the Hindi term gurmar Tamil(சிறுகுறிஞ்சான்) Sirukurunjan, which means "sugar destroyer" The leaves and extracts contain gymnemic acids, the major bioactive constituents that interact with taste receptors on the tongue to temporarily suppress the taste of sweetness.
Beta hairpin Extremely common. Two antiparallel beta strands connected by a tight turn of a few amino acids between them. Greek key Four beta strands, three connected by hairpins, the fourth folded over the top. Omega loop A loop in which the residues that make up the beginning and end of the loop are very close together. Helix-loop-helix Consists of alpha helices bound by a looping stretch of amino acids. This motif is seen in transcription factors. Zinc finger Two beta strands with an alpha helix end folded over to bind a zinc ion. Important in DNA binding proteins. Helix-turn-helix Two α helices joined by a short strand of amino acids and found in many proteins that regulate gene expression. Nest Extremely common. Three consecutive amino acid residues form an anion-binding concavity. Niche Extremely common. Three or four consecutive amino acid residues form a cation-binding feature.
As of 2014, multiple drugs have been used for therapeutic intervention, including lidocaine, naloxone, thiamine, lorazepam, vecuronium, etomidate, propofol, tolazoline, yohimbine, atropine, orciprenaline, metoclopramide, ranitidine, metoprolol, enoxaparin, flucloxacillin, insulin, and irrigation of both eyes with saline. The treatment after a xylazine overdose primarily involves maintaining respiratory function and blood pressure. In cases of intoxication, physicians recommend intravenous fluid infusion, atropine, and hospital observation. Severe cases may require tracheal intubation, mechanical ventilation, gastric lavage, activated charcoal, bladder catheterization, electrocardiographic (ECG) and hyperglycemia monitoring. Physicians typically recommend which detoxification treatment should be used to manage possible dysfunction involving highly perfused organs such as the liver and kidneys.
Sources: en.wikipedia.org
The cyclol hypothesis is the now discredited first structural model of a folded, globular protein, formulated in the 1930s. It was based on the cyclol reaction of peptide bonds proposed by physicist Charles Frank in 1936, in which two peptide groups are chemically crosslinked. These crosslinks are covalent analogs of the non-covalent hydrogen bonds between peptide groups and have been observed in rare cases, such as the ergopeptides. Based on this reaction, mathematician Dorothy Wrinch hypothesized in a series of five papers in the late 1930s a structural model of globular proteins. She postulated that, under some conditions, amino acids will spontaneously make the maximum possible number of cyclol crosslinks, resulting in cyclol molecules and cyclol fabrics. She further proposed that globular proteins have a tertiary structure corresponding to Platonic solids and semiregular polyhedra formed of cyclol fabrics with no free edges. In contrast to the cyclol reaction itself, these hypothetical molecules, fabrics and polyhedra have not been observed experimentally. The model has several consequences that render it energetically implausible, such as steric clashes between the protein sidechains. In response to such criticisms J. D. Bernal proposed that hydrophobic interactions are chiefly responsible for protein folding, which was indeed borne out.
The TWG's criteria were used to arbitrate later element discovery claims from LBNL and JINR, as well as from research institutes in Germany (GSI) and Japan (Riken). Currently, consideration of discovery claims is performed by a IUPAC/IUPAP Joint Working Party. After priority was assigned, the elements were officially added to the periodic table, and the discoverers were invited to propose their names. By 2016, this had occurred for all elements up to 118, therefore completing the periodic table's first seven rows. The discoveries of elements beyond 106 were made possible by techniques devised by Yuri Oganessian at the JINR: cold fusion (bombardment of lead and bismuth by heavy ions) made possible the 1981–2004 discoveries of elements 107 through 112 at GSI and 113 at Riken, and he led the JINR team (in collaboration with American scientists) to discover elements 114 through 118 using hot fusion (bombardment of actinides by calcium ions) in 1998–2010. The heaviest known element, oganesson (118), is named in Oganessian's honour. Element 114 is named flerovium in honour of his predecessor and mentor Flyorov. In celebration of the periodic table's 150th anniversary, the United Nations declared the year 2019 as the International Year of the Periodic Table, celebrating "one of the most significant achievements in science". The discovery criteria set down by the TWG were updated in 2020 in response to experimental and theoretical progress that had not been foreseen in 1991. Today, the periodic table is among the most recognisable icons of chemistry.
=== Milk pasteurization by microwave === When storage conditions of milk are controlled, milk tends to have a very good flavor. However, oxidized flavor is a problem that affects the taste and safety of milk in a negative way. To prevent the growth of pathogenic bacteria and extend the shelf life of milk, pasteurization processes were developed. Microwaved milk has been studied and developed to prevent oxidation compared to traditional pasteurized milk methods, and it has been concluded that milk has a better quality when it has microwaved milk pasteurization.
All injector pens other than those designed for single use require the use of single-use replaceable pen needles for each injection. These pen needles come in various lengths to accommodate varying depths of subcutaneous tissue under the top of the skin. Pen needles are designed for single use subcutaneous injection of medication and are not designed to be reused for more than one administration. The needles are generally manufactured with an outer protective plastic shell, which is used by a person to attach the needle to the pen, and an inner plastic shell protecting the needle itself. Instruction on how to properly attach and use needles is the responsibility of the doctor or pharmacist to ensure proper use. Today, pen needles are manufactured at shorter needle lengths than required for typical vial and syringe administration, which decreases the pain associated with injection. They are available in multiple lengths and gauge of needle, including 3.5mm, 4mm, 5mm, and 8mm lengths, and 31 through 34 gauge. Over time, needles have also had bevels designed which decrease the force required to penetrate the skin, which decreases the pain associated with injection and may increase the acceptability of self-injection. Furthermore, pen needles are designed for insertion at a 90-degree angle to the skin, as opposed to normal syringes which are designed to be injected at an angle. Pen needles generally do not require pinching of the skin for proper administration, unlike historically used syringes.
Sources: en.wikipedia.org
The transition from capitalism to socialism was signified by the introduction of the first five-year plan and the 1936 Soviet Constitution. By the late 1920s, Stalin established ideological orthodoxy in the CPSU, Soviet Union, and Communist International to establish universal Marxist–Leninist praxis. The formulation of the Soviet version of dialectical and historical materialism by Stalin and his associates, such as in Stalin's text Dialectical and Historical Materialism, became the official Soviet interpretation of Marxism, and was taken as example by Marxist–Leninists in other countries. This text became the foundation philosophy of Marxism–Leninism. In 1938, Stalin's textbook History of the Communist Party of the Soviet Union (Bolsheviks) popularised Marxism–Leninism. The internationalism of Marxism–Leninism was expressed in supporting revolutions in other countries, initially through the Communist International, then through the concepts of national democratic states and states of socialist orientation after de-Stalinisation. The establishment of other communist states after World War II resulted in Sovietisation, and these states tended to follow the Marxist–Leninist model of five-year plans and rapid industrialisation, political centralisation, and repression. During the Cold War, Marxist–Leninist countries like the Soviet Union were a major force in international relations.
== Clinical use == Recombinant human nerve growth factor (rhNGF; named cenegermin) has been formulated as an eye drop (0.002%), receiving approval by the FDA in 2018 for treating neurotrophic keratitis, a disease in which corneal nerves are damaged or nonfunctional. NGF, specifically mouse nerve growth factor, has been used as a licensed medicine in China since 2003.
The United States Food and Drug Administration's Investigational New Drug (IND) program is the means by which a pharmaceutical company obtains permission to start human clinical trials and to ship an experimental drug across state lines (usually to clinical investigators) before a marketing application for the drug has been approved. Regulations are primarily at 21 CFR 312. Similar procedures are followed in the European Union, Japan, and Canada due to regulatory harmonization efforts by the International Council for Harmonisation.
Cresskill is a borough in Bergen County, in the U.S. state of New Jersey. As of the 2020 United States census, the borough's population was 9,155, an increase of 582 (+6.8%) from the 2010 census count of 8,573, which in turn reflected an increase of 827 (+10.7%) from the 7,746 counted in the 2000 census. This borough got its name from "Cress", referring to the watercress that grew in its streams, and "Kill", referring to the stream passing through.
These imply a group-wide choice of a degree of parental care. They may build nests and dig burrows to raise their young in, or feed and guard them often for a prolonged period of time. Many mammals are K-selected, and invest more time and energy into their young than do r-selected animals. When two animals mate, they both share an interest in the success of the offspring, though often to different extremes. Mammalian females exhibit some degree of maternal aggression, another example of parental care, which may be targeted against other females of the species or the young of other females; however, some mammals may "aunt" the infants of other females, and care for them. Mammalian males may play a role in child rearing, as with tenrecs, however this varies species to species, even within the same genus. For example, the males of the southern pig-tailed macaque (Macaca nemestrina) do not participate in child care, whereas the males of the Japanese macaque (M. fuscata) do.
Sources: en.wikipedia.org
Epitalon is a synthetic four-amino-acid peptide with the sequence alanine–glutamate–aspartate–glycine, also written AEDG. It was developed in Russian gerontology research and is studied for proposed effects on telomerase, melatonin regulation, and neuroendocrine function. It is not an approved pharmaceutical in the United States or the European Union.
No. Epithalamin is a peptide-rich extract prepared from bovine pineal glands, while epitalon is a short synthetic peptide designed as a defined analogue of it. The synthetic version was intended to provide a reproducible molecule with some of the same proposed biological activity.
Telomere elongation and telomerase activation have been reported in cultured human somatic cells, but evidence from living human subjects is limited and has not been independently confirmed at scale. Reported findings come largely from small studies with differing designs, so the question remains open rather than settled.
It is a four-amino-acid peptide built from alanine, glutamate, aspartate and glycine in that order. Its formula is C14H22N4O9, and it is made by chemical synthesis rather than extracted from tissue. The synthetic peptide is a single defined molecule, unlike the pineal extracts it is often compared with.