The short version of epitalon fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2025-08-09. Anything still debated is marked as such rather than presented as settled.
Epitalon is a synthetic tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. It was designed at the St. Petersburg Institute of Bioregulation and Gerontology as a short, chemically defined analogue of epithalamin, a fraction obtained from bovine pineal tissue. Small peptide bioregulators of this type formed a long-running line of work there from the 1980s onward. Because the molecule is produced by solid-phase synthesis rather than extraction, its composition is exact and its purity can be measured directly.
The most frequently cited proposed action is induction of telomerase, the enzyme that adds repeat sequences to chromosome ends. Cell-culture work from the originating group reported higher telomerase reverse transcriptase expression and measurable telomere elongation in human somatic cells after exposure. How a four-residue peptide would reach nuclear gene regulation is not established, and no cell-surface receptor or uptake route has been identified. Additional reports describe changes in melatonin secretion, antioxidant enzyme activity and lipid peroxidation in aged animals, but these findings remain mechanistically unconnected to the telomerase observation.
Stability of the tetrapeptide follows ordinary peptide chemistry rather than any unusual structural feature. The aspartate-glycine pair is prone to aspartimide formation under mildly basic or neutral conditions, and deamidation can follow, altering both mass and chromatographic retention. Dry lyophilised powder kept at or below minus twenty degrees Celsius is the usual handling recommendation, with repeated freeze-thaw cycles avoided. Once dissolved in neutral aqueous buffer, degradation proceeds over days to weeks depending on pH and temperature, while acidic conditions generally slow the aspartimide route. A formal stability-indicating study has not been published in the indexed literature.
Because epitalon has no pharmacopoeial monograph, quality assessment depends on supplier documentation and independent testing. Certificates of analysis typically report a purity figure from a single chromatographic run, a measured mass and sometimes an appearance description, but methods and acceptance criteria are not harmonised across vendors. Third-party laboratories can repeat identity and purity measurements, and mismatches between labelled and measured peptide content have been described for research peptides generally. What constitutes adequate identity confirmation for a molecule of this size stays an open question, since mass agreement alone does not separate closely related sequences.
Identity testing for epitalon relies on reversed-phase high-performance liquid chromatography for purity and mass spectrometry for mass confirmation. Because the sequence contains no tryptophan or tyrosine, ultraviolet detection at 280 nanometres is insensitive, so chromatographic methods usually monitor absorbance near 214 nanometres, where the peptide backbone absorbs. Electrospray ionisation or matrix-assisted laser desorption/ionisation then checks the intact mass against the expected value near 390 daltons. Peptide mapping or amino acid analysis after acid hydrolysis can supplement these measurements, although such confirmatory work is seldom reported on commercial certificates of analysis.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Calculated from the four residues with three water losses |
| Molecular mass | About 390.35 g/mol | Monoisotopic mass near 390.14, used for mass-spectrometric identification |
| Peptide sequence | Ala-Glu-Asp-Gly | Single-letter form AEDG; no disulfide bonds or modified residues |
| Appearance | White to off-white solid | Supplied as a dried powder |
| Isoelectric point | Around 4 | Estimated from aspartate and glutamate side-chain pKa values |
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.
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.
Peptides of this size are generally stable as dry solids but degrade in solution over time. The principal routes are hydrolysis of the peptide backbone and oxidation, with hydrolysis favoured by elevated temperature and extreme pH. Aqueous solutions held at room temperature can show measurable loss of purity within days, while frozen aliquots are considerably more durable. Because the sequence contains neither cysteine nor methionine, oxidation is less of a concern than for many other peptides, but pH control during handling still matters.
Typical storage for the lyophilized powder is −20 °C or lower, in a sealed container protected from light and moisture. Hygroscopic material should be allowed to equilibrate to room temperature before the vial is opened, which limits condensation on the contents. Working solutions are commonly divided into single-use aliquots and frozen to avoid repeated freeze-thaw cycles. Dilute solutions are more prone to adsorption onto plastic surfaces and to loss during filtration, so procedures that minimize transfers and use low-binding labware are preferable.
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.
Epitalon is a synthetic tetrapeptide whose sequence is alanine–glutamate–aspartate–glycine, commonly abbreviated AEDG. It was developed in Russia during the 1980s and 1990s by investigators associated with the St. Petersburg Institute of Bioregulation and Gerontology, who studied short peptides as regulators of gene expression and tissue function. The alternative spelling epithalon appears interchangeably in the literature, and the two names refer to the same molecule. Outside Russia it is encountered chiefly as a research chemical rather than a licensed medicine, and it holds no approval from the United States Food and Drug Administration or the European Medicines Agency.
Animal and clinical reports appear mainly in Russian-language journals from the 1990s and 2000s, covering endpoints such as melatonin rhythm, lifespan in aged rodents, and retinal function. Many of these papers involve small groups, lack blinding or placebo comparison, and are difficult to retrieve through indexed databases. Review articles published in English generally summarise the claims without reanalysing the underlying data. Because no large randomised trial exists, the clinical importance of these reported effects stays unresolved and is properly described as an open question.
No national medicines regulator has approved epitalon as a therapeutic product. It is generally distributed as a research chemical, and in some jurisdictions selling peptides for human consumption without approval is restricted or prohibited. Certificates of analysis accompanying commercial material vary in which tests are performed, and independent verification of identity and purity is uncommon. Statements about anti-ageing or disease-prevention benefits on vendor pages are marketing claims rather than regulatory findings, a distinction that shapes how the compound is discussed in scientific and popular sources alike.
Caridad del Rosario Diego Bello, the head of the Office of Religious Affairs, then held a private meeting with a group of Freemasons. She told them that she had no knowledge about anything that had been happening, but encouraged everyone to abide by the Ministry of Justice so that the fraternity could continue to operate in Cuba.
== Research == Stem cell therapy may represent a treatment for promoting the healing of diabetic foot ulcers. Diabetic foot ulcers develop their own, distinctive microbiota. Investigations into characterizing and identifying the phyla, genera, and species of nonpathogenic bacteria or other microorganisms populating these ulcers may help identify one group of microbiota that promotes healing. The recent advances in epigenetic modifications, with special focus on aberrant macrophage polarisation, are giving increasing evidence that epigenetic modifications might play a vital role in changing the treatment of diabetic foot ulcer in the near future.
Following a new level of cooperation between Roscomos and NASA in the 1990s the decision to implement the project that was called, the "most complex scientific and political multi-stage project ever undertaken by the Great Powers, the project promises to push the boundaries of what is possible, operates entirely in the New Frontier and represents a new epoch in this history of mankind" began. The station took multiple decades to develop and has been continually occupied since 2000.
In the 1970s, biscuit manufacturers began using micro-aeration to process chocolate for moulded products. This was a cost-saving measure: with less chocolate, the same volume of coated biscuit could be maintained. In 1981 or 1983, Cadbury released Wispa, an aerated chocolate with a more chunky shape than Aero bars, made using a secret, non-patented process. The launch of Wispa was successful, but it soon encountered manufacturing difficulties and was temporarily withdrawn from the market. While Wispa was off the market, Rowntree's developed and launched a chunky Aero which they successfully launched and was still being sold as of 2008. Wispa was discontinued in the early 2000s so Cadbury could bring in a new aerated chocolate product aligned with the Cadbury Dairy Milk brand: Dairy Milk Bubbly. Following an internet campaign in 2007, Cadbury reintroduced Wispa. Today, Aero is manufactured by Nestlé, the brand having been acquired by Nestlé during a 1988 takeover of Rowntree's. As of 2023, other brands of aerated chocolate includes Mirage and Galaxy.
Sources: en.wikipedia.org
short arm Denoted in shorthand with the symbol p. In condensed chromosomes where the positioning of the centromere creates two segments or "arms" of unequal length, the shorter of the two arms of a chromatid. Contrast long arm.
At the beginning of the season, Zverev was still ranked too low to receive direct entry into the main draws of ATP Tour events, which forced him to continue playing Challenger events through July. He also needed to enter qualifying for ATP events throughout the year. Zverev did not qualify for either of the first two major singles events of the season. He was able to qualify for his first Masters event at the Miami Open and reached the second round. During the clay-court season, Zverev partnered with his brother Mischa to reach his first career ATP final in doubles at the Bavarian International Tennis Championships. The Zverev brothers finished runner-up to top-seeded Alexander Peya and Bruno Soares. Later that month, he won his second career Challenger title at the Heilbronn Neckarcup to crack the top 100 of the ATP rankings. With a higher ranking, Zverev was directly accepted into Wimbledon. A week before the tournament, he took part in the Boodles Challenge exhibition and surprisingly upset world No. 1 Novak Djokovic in straight sets. Zverev backed up this performance in his Grand Slam tournament main draw debut, defeating Teymuraz Gabashvili in a tight match that lasted until 9–7 in the fifth and final set. He lost in the next round to Denis Kudla. Zverev opted to play on clay after Wimbledon and reached another ATP semifinal at the Swedish Open to put him back in the top 100 after one week out. In August, Zverev returned to the United States and competed in two US Open Series events. He notably upset No.
== Pollepel Island chevaux-de-frise (1776–1777) == Another cheval-de-frise was undertaken across the Hudson between Plum Point on the east bank and Pollepel Island north of West Point. The defenses were never fully completed, and its importance was overshadowed by completion of the Great Chain at West Point the following year.
Numerous Jamaicans migrated mainly to the islands of San Andres and Providencia. A number of other Europeans and North Americans migrated to the country in the late 19th and early 20th centuries, including people from the former USSR during and after the Second World War. Many immigrant communities have settled on the Caribbean coast, in particular recent immigrants from the Middle East and Europe. Barranquilla (the largest city of the Colombian Caribbean) and other Caribbean cities have the largest populations of Lebanese, Palestinian, and other Levantines. There are also important communities of Romanis and Jews. There is a major migration trend of Venezuelans, due to the political and economic situation in Venezuela. In August 2019, Colombia offered citizenship to more than 24,000 children of Venezuelan refugees who were born in Colombia.
Information published by the Department for Science, Innovation and Technology reveals that £15,000 in damages was paid to academic Kate Sand after Science Minister Michelle Donelan described her as a Hamas supporter in 2023; Donelan retracted the allegations on 5 March. University Challenge contestant Melika Gorgianeh accepts substantial damages from Conservative peer Jacqueline Foster after Foster accused her of being antisemitic following her appearance on the quiz show in November 2023. Senedd member Rhys ab Owen is to be banned from the Senedd for six weeks after an investigation by the Senedd Commission found he inappropriately touched two women during a night out in June 2021. 7 March – Blur drummer Dave Rowntree is selected as the Labour Party candidate for Mid Sussex. 8 March – Former prime minister Theresa May announces she is stepping down from Parliament at the next general election. Brenda Dacres is elected Mayor of Lewisham becoming the first black woman directly elected mayor in England. Robin Simcox, the UK government's Commissioner for Countering Extremism, warns that London has become a "no-go zone for Jews" at weekends because of pro-Palestinian protests. 9 March – In an article posted on LinkedIn, senior UK government ministers Anne-Marie Trevelyan and Tom Tugendhat urge Sunak to increase defence spending to above 2.5% of GDP, arguing that the UK needs to "lead the way" on defence spending and invest at a "much greater pace".
Sources: en.wikipedia.org
gestational diabetes. This temporary form of diabetes appears during pregnancy, and with glucose-controlling medication or insulin symptoms can be improved. type 1 and type 2 diabetes or prediabetes. If diagnosed with diabetes, regular glucose tests can help manage or maintain conditions. Type 1, is commonly seen in children or teenagers whose bodies are not producing enough insulin. Type 2 diabetes, is typically seen in adults who are overweight. The insulin in their bodies are either not working normally, or there is not being enough produced. Low blood sugar may indicate
== External links == "Chart of Nuclides". National Nuclear Data Center (NNDC). Archived from the original on 2018-10-10. Retrieved 2014-08-21. Los Alamos National Laboratory's Chemistry Division: Periodic Table – Lawrencium Lawrencium at The Periodic Table of Videos (University of Nottingham)
==== Side effects and toxicity ==== The most common side effect is diarrhea and dyspepsia, occurring in up to 30% of patients. The most important and serious side effect is lactic acidosis, therefore metformin is contraindicated in advanced chronic kidney disease. Kidney function should be assessed before starting metformin. Phenformin and buformin are more prone to cause acidosis than metformin; therefore they have been practically replaced by it. However, when metformin is combined with other drugs (combination therapy), hypoglycemia and other side effects are possible.
We went to South Ossetia on the night of August 7. Around noon of 7 August, the column was near Tskhinvali on the bypass road." In August 2009, Russian military reporter Alex Kots quoted Andrey Kazachenko, commander of the 693rd Regiment, as saying that the General Staff of Russia issued an order to begin movement towards Tskhinvali at 8:20 PM on August 7. In August 2009, Major of the Medical Service Dmitry Zubok told radio station moskva.fm that several surgeons, including him, were sent to South Ossetia on 14 July 2008 in anticipation of conflict and that the armed hostilities began on 6 August 2008. In September 2009, an independent documentary "Russian Lessons" was premiered in Saint Petersburg. Russian film makers Andrei Nekrasov and Olga Konskaya disputed the narrative of the Russian government (supported by the most Western media at the time) and examined wartime propaganda. The film also includes a testimony by a father of Russian soldier that his son was sent to the war on 5 August 2008.
Sources: en.wikipedia.org
No. Epithalamin is a peptide-containing extract of bovine pineal glands, while epitalon is a single synthetic tetrapeptide. The extract contains many peptides and other tissue components, so its composition varies between batches in ways that a synthesised sequence does not.
It is not recognised as an endogenous peptide hormone. The four-residue sequence can appear inside larger proteins and in digestive fragments of dietary protein, but no dedicated pathway producing it as a signalling molecule has been identified.
Several cell-culture reports describe increased telomerase activity after treatment, measured by enzyme assays or by transcript levels. Results differ between cell types and laboratories, and measured telomere lengthening has been reported in some studies but not in others, which leaves the physiological relevance open.
The molecule lacks aromatic residues, so it absorbs weakly near 280 nanometres, the wavelength applied to many other peptides. The peptide bond absorbs strongly below 220 nanometres, making 214 nanometres a practical compromise. Gradient methods must therefore use mobile phases with low ultraviolet absorbance to keep the baseline clean.