Everything below concerns AEDG. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-07-15. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
Identity and purity are established with reversed-phase high-performance liquid chromatography and mass spectrometry. The chromatogram shows the main peak and any truncated or oxidised by-products, while the mass spectrum confirms the expected 390 dalton mass. Amino acid analysis can corroborate composition when a sample's origin is uncertain. Counterion content, particularly residual trifluoroacetate from purification, is frequently reported alongside purity because it shifts the net mass of the solid.
Reference material is normally supplied as a lyophilised powder in a sealed vial. Product literature typically recommends storage at minus twenty degrees Celsius or colder, protected from light and moisture. Freeze-thaw cycling is usually avoided because repeated condensation can introduce water into the vial. Working solutions are commonly prepared fresh, aliquoted, and kept cold for short periods rather than stored at ambient temperature. Labelling the date of opening helps track how long a vial has been in use.
Solubility is high in water, phosphate-buffered saline and normal saline, a pattern that follows from the two acidic residues in the chain. The peptide dissolves poorly in non-polar solvents such as hexane or chloroform. Stock solutions are often prepared in water first and then diluted into the buffer of interest. Because the molecule is small and hydrophilic, filtration through a low-protein-binding membrane is usually straightforward, and visible particulates are uncommon in freshly made solutions.
| 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 |
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 with the sequence alanine–glutamate–aspartate–glycine, commonly abbreviated AEDG. Its design traces to epithalamin, a peptide fraction prepared from bovine pineal gland extracts that researchers in Saint Petersburg began investigating in the 1970s. The compound has a molecular formula of C14H22N4O9 and a nominal molecular mass near 390 daltons. It holds no approved drug status in the United States or the European Union, and material sold under this name is generally offered as a research chemical rather than a finished pharmaceutical product.
Regulatory treatment differs by country. No formulation of epitalon holds a marketing authorisation as a medicine in the United States or the European Union, where material sold for laboratory use is handled as a research chemical and is not intended for human consumption. In Russia, several short peptide preparations from the same institute's peptide series are registered medicinal products, and epitalon appears in that national context. Elsewhere it is frequently offered as a cosmetic ingredient, a category with lighter requirements. Advertising claims about longevity or disease prevention are restricted in most jurisdictions, which limits how sellers describe the compound.
Freeze-dried epitalon is normally kept at minus twenty degrees Celsius in a sealed, desiccated container, protected from light. Short excursions at ambient temperature during shipping are generally tolerated, but repeated warming and cooling cycles encourage moisture uptake, which shortens shelf life. Once dissolved, the peptide is far less stable than the solid: aqueous solutions are subject to hydrolysis and to deamidation at the aspartate and glutamate residues. Working solutions are therefore held refrigerated and used within days, and repeated freezing and thawing of the same vial is best avoided.
（TG:@pojiaai）Epitalon is a synthetic linear tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, abbreviated AEDG. It emerged from work on epithalamin, a peptide fraction prepared from bovine pineal tissue, and was designed as a short, chemically defined analogue of that extract. Early publications came mainly from Russian laboratories studying pineal peptides and aging-related endpoints. The compound appears in the literature under several spellings, including epithalon and epithalone, which complicates systematic searching. Its small size makes solid-phase assembly and routine analytical characterization straightforward.
Chemically, the molecule consists of four amino acid residues joined by three peptide bonds, with a free N-terminal amino group and a free C-terminal carboxyl group. Its molecular formula is C14H22N4O9, and its monoisotopic mass is approximately 390 daltons. The acidic glutamate and aspartate side chains give the peptide a net negative charge near neutral pH, a property that shapes its chromatographic behaviour and solubility profile. No disulfide bridges or other post-translational modifications are present, so the primary sequence alone defines the structure.
Lyophilised epitalon is generally held at minus twenty degrees Celsius in a sealed container kept dry and dark. Cooler conditions are sometimes recommended for long-term archives. The solid takes up moisture readily enough that repeated opening of a vial introduces water, so dividing a batch into smaller portions before storage lowers degradation risk. Aqueous solutions are less durable than the dry powder and are usually prepared shortly before use, then kept cold and shielded from light to slow hydrolysis and oxidation.
Verification of research-grade material involves comparing a supplier chromatogram against an in-house reference, checking the observed mass against the calculated value, and where possible confirming residue order by tandem mass spectrometry or enzymatic peptide mapping. Purity claims should be read alongside the method used to obtain them, because detection wavelength and integration settings alter the result. Batch-specific data, rather than a generic grade statement, is the informative part of a certificate.
Identity and purity of epitalon samples are normally established by reversed-phase high-performance liquid chromatography with ultraviolet detection near 214 nanometres, combined with mass spectrometry. The mass spectrum confirms the expected molecular ion and can reveal truncated or oxidised by-products. Amino acid analysis after acid hydrolysis verifies that the four residues are present in the expected ratio. Certificates typically report a purity figure taken from chromatographic peak area, expressed as a percentage of total integrated signal.
==== Sleep disorders ==== Modafinil, a eugeroic or wakefulness-promoting drug, is used for treating narcolepsy, a sleep disorder characterized by excessive daytime sleepiness and sudden sleep attacks. Being a central nervous system (CNS) stimulant itself, modafinil has lower addictive potential than classical stimulants such as amphetamine, cocaine, or methylphenidate, but still produces psychoactive and subjective effects typical of classical stimulants. Narcolepsy causes a strong urge to sleep during the day and can include symptoms like cataplexy (sudden muscle weakness), sleep paralysis (inability to move or speak while falling asleep or waking up), and hallucinations. Narcolepsy is linked to a lack of the brain chemical hypocretin (orexin), primarily produced in the hypothalamus. Modafinil is not a cure for narcolepsy, but it can help manage the symptoms. While modafinil is used to treat excessive sleepiness, it may also help reduce the frequency and severity of cataplexy attacks in some people. Modafinil is approved for management of narcolepsy with or without cataplexy. However, it is not specifically approved for the treatment of cataplexy. Modafinil is also prescribed for shift work sleep disorder, a condition affecting people who work rotating or night shifts and experience excessive sleepiness during work hours and difficulty sleeping during the day. The recommended dose for this indication is 200 mg taken approximately one hour before the start of the work shift.
=== 5 January === Ten people were killed in an SAF airstrike in Khartoum. The SAF and the JDF claimed to have deflected an RSF assault on El Fasher that came from the east and southeast of the city. The JDF also intercepted a weapons convoy for the RSF, arresting both Sudanese and Libyan nationals.
Between 60% and 75% also mentioned other factors such as core clerkship grades, perceived commitment to specialty, audition elective/rotation within your department, any failed attempt in USMLE, class ranking/quartile, personal prior knowledge of the applicant, perceived interest in program and passing USMLE Step 2 CS. These factors often come as a surprise to many students in the preclinical years, who often work very hard to get great grades, but do not realize that only 45% of directors cite basic science performance as an important measure. Applicants begin the application process with ERAS regardless of their matching program at the beginning of their fourth and final year in medical school. At this point, students choose specific residency programs to apply for that often specify both specialty and hospital system, sometimes even subtracks (e.g., Internal Medicine Residency Categorical Program at Mass General or San Francisco General Primary Care Track).
== References == Berk, A A. LISP: the Language of Artificial Intelligence. New York: Van Nostrand Reinhold Company, 1985. 1-25. Lederberg, Joshua. An Instrumentation Crisis in Biology. Stanford University Medical School. Palo Alto, 1963. Lederberg, Joshua. Dendral-64 - a system for computer construction, enumeration and notation of organic molecules as tree structures and cyclic graphs. part i- notational algorithm for tree structures. Interim Report to the National Aeronautics and Space Administration, 15 December, 1964. Lederberg, Joshua. How Dendral Was Conceived and Born. ACM Symposium on the History of Medical Informatics, 5 November 1987, Rockefeller University. New York: National Library of Medicine, 1987. Alternate link to article Lindsay, Robert K., Bruce G. Buchanan, Edward A. Feigenbaum, and Joshua Lederberg. Applications of Artificial Intelligence for Organic Chemistry: The Dendral Project[link removed]. McGraw-Hill Book Company, 1980. Lindsay, Robert K., Bruce G. Buchanan, E. A. Feigenbaum, and Joshua Lederberg. DENDRAL: A Case Study of the First Expert System for Scientific Hypothesis Formation. Artificial Intelligence 61, 2 (1993): 209-261. November, Joseph A. “Digitizing Life: The Introduction of Computers to Biology and Medicine.” Doctoral dissertation, Princeton University, 2006 "Mit smarter Software zur Analytik 4.0." CHEManager (GIT Verlag). Accessed 15 October 2025. "Limitationen von Datenbanken und Möglichkeiten für künstliche Intelligenz." Wiley Analytical Science. Accessed 15 October 2025.
As flour fortification started adding niacin in the US, the United States Government adopted the terms niacin (a shortened form of "nicotinic acid vitamin") and niacinamide in 1942 as alternate names for nicotinic acid and nicotinamide, respectively, and encouraged their use in nontechnical contexts to avoid the public confusing them with the nearly unrelated (and toxic) nicotine. The terms were incorporated into the United States Adopted Name dictionary that was created in 1961. The term niacin was then adopted internationally by multiple institutions (WHO/FAO, EFSA, FDA, Anvisa) using a broader meaning including all dietary NAD precursors that can prevent signs of deficiency. In other words, the term is used with the same meaning as vitamin B3, including not just nicotinic acid, but also nicotinamide, and nicotinamide riboside. The term niacinamide failed to replace nicotinamide. Between 1942 and 2022, it has never surpassed nicotinamide in terms of occurrence in published books, according to Google Ngram Viewer.
Sources: en.wikipedia.org
Marguerite Stern (born November 24, 1990) is a French polemicist and activist known for her past work with Femen France and founding a collage movement against femicide. Her commentary on trans issues led peers in the collage movement to label her transphobic, and she became increasingly marginalized within it; she later affiliated with far-right political figures such as Julien Rochedy.
Starch is stored in granule form. Starch granules are composed of a crystalline structure of amylopectin and amylose. Amylopectin forms the structure of the starch granule, with branching and non branching A-chains, B-chains, and C-chains. Amylose fills in the gaps of the amylopectin structure. Under a microscope, starch granules look like concentric layers, referred to as “growth rings”. Starch granules also contain granule-bound starch synthase and amylopectin synthesizing enzymes. Notably, starch granules vary in size and morphology across plant tissues and species.
By the 1820s, the different Nonconformists, including Wesleyan Methodists, Baptists, Congregationalists and Unitarians, had formed the Committee of Dissenting Deputies and agitated for repeal of the highly restrictive Test and Corporation Acts. These Acts excluded Nonconformists from holding civil or military office or attending Oxford or Cambridge, compelling them to set up their own Dissenting Academies privately. The Tories tended to be in favour of these Acts and so the Nonconformist cause was linked closely to the Whigs, who advocated civil and religious liberty. After the Test and Corporation Acts were repealed in 1828, all the Nonconformists elected to Parliament were Liberals. Nonconformists were angered by the Education Act 1902, which integrated Church of England denominational schools into the state system and provided for their support from taxes. John Clifford formed the National Passive Resistance Committee and by 1906 over 170 Nonconformists had gone to prison for refusing to pay school taxes. They included 60 Primitive Methodists, 48 Baptists, 40 Congregationalists and 15 Wesleyan Methodists. The political strength of Dissent faded sharply after 1920 with the secularisation of British society in the 20th century. The rise of the Labour Party reduced the Liberal Party strongholds into the nonconformist and remote "Celtic Fringe", where the party survived by an emphasis on localism and historic religious identity, thereby neutralising much of the class pressure on behalf of the Labour movement.
At least three isoforms of synuclein are produced through alternative splicing. The majority form of the protein, and the one most investigated, is the full-length protein of 140 amino acids. Other isoforms are alpha-synuclein-126, which lacks residues 41-54 due to loss of exon 3; and alpha-synuclein-112, which lacks residues 103-130 due to loss of exon 5.
Sources: en.wikipedia.org
== ABC News report == An 11-segment series of reports in March 2012 from ABC News brought widespread public attention to and raised consumer concerns about the product. The product was described as "essentially scrap meat pieces compressed together and treated with an antibacterial agent". Lean finely textured beef (LFTB) was referred to as "an unappetizing example of industrialized food production". The product has been characterized as "unappetizing, but perhaps not more so than other things that are routinely part of hamburger" by Sarah Klein, an attorney for the food safety program at the Center for Science in the Public Interest. Nutritionist Andy Bellatti has referred to the product as "one of many symptoms of a broken food system". Food policy writer Tom Laskawy noted that ammonium hydroxide is only one of several chemicals routinely added to industrially produced meat in the United States. It was reported at that time that 70% of ground beef sold in US supermarkets contained the additive, and that the USDA considered it as meat. The USDA issued a statement that LFTB was safe and had been included in consumer products for some time, and its Under Secretary of Agriculture for Food Safety Elisabeth A. Hagen stated that "The process used to produce LFTB is safe and has been used for a very long time. And adding LFTB to ground beef does not make that ground beef any less safe to consume".
Analysis of mitochondrial DNA by German herpetologist Wolfgang Wüster and colleagues in 2005 found the Papuan and nominate subspecies to be very similar genetically; however, their distinct coloration and limited sampling led Wüster to refrain from lumping the subspecies into a single taxon. Raymond Hoser described Oxyuranus scutellatus barringeri from a specimen collected from the Mitchell Plateau, however Wüster declared this a nomen nudum as the author did not explain how it was distinct. Hoser replied that it was distinct on the basis of DNA and distribution, and published it under a different subspecific name—O. scutellatus andrewwilsoni—in 2009, reporting it had a more rounded head and rougher neck scales than other subspecies of coastal taipan, and lacked a lighter colour on the snout. Kinghorn gave it the name "giant brown snake" in 1930, before Thomson introduced the term taipan in 1933. It is commonly called the coastal taipan, common taipan, or simply taipan. The New Guinea subspecies is known as the Papuan taipan. Local names in New Guinea include dirioro by the people of Parama village near the Fly River, and gobari near the Vailala River.
=== Cancer diagnosis and departure === In the serial's first episodes of 2022, Ari takes the blame for Matthew's murder in order to protect Mia and Chloe. Ari is held on remand ahead of his sentencing hearing. Kipa-Williams explained that none of the Parata family can accept that Ari is going to prison. But he cannot accept seeing Chloe or Mia go there either, and he cannot work out a way where it would end well for them. Kipa-Williams continued, "He decides to take the fall because he knows he can handle it." Tane steps up as head of the family in Ari's absence, while Nikau pleads with his uncle to tell the police the truth. Kipa-Williams believed that his character's one regret was not marrying Mia. The storyline marked the beginning of Ari's exit from Home and Away, as he is later rushed to hospital with stabbing pains. Logan Bennett (Harley Bonner) initially thinks he may have appendicitis, but he later informs Ari that he has cancer of the appendix, which has spread to his abdomen. Logan also tells Ari that he could undergo a large, lengthy surgery to remove the tumours, but it would need to be repeated every few months. Ari decides not to go through with surgery as he wants to die on his terms. Daniel Kilkelly of Digital Spy reported that rumours of Kipa-Williams' exit from the serial had been circulating for months. Mia makes a "moving" proposal that she and Ari get married at the hospital, which he accepts. Ari insists that the day is about "celebration, not commiseration", and he and Mia marry in front of Tane, Nikau, and Chloe.
α-Methyl-p-tyrosine (AMPT), or simply α-methyltyrosine, also known in its chiral 2-(S) form as metirosine, is a tyrosine hydroxylase enzyme inhibitor and is therefore a drug involved in inhibiting the catecholamine biosynthetic pathway. AMPT inhibits tyrosine hydroxylase whose enzymatic activity is normally regulated through the phosphorylation of different serine residues in regulatory domain sites. Catecholamine biosynthesis starts with dietary tyrosine, which is hydroxylated by tyrosine hydroxylase and it is hypothesized that AMPT competes with tyrosine at the tyrosine-binding site, causing inhibition of tyrosine hydroxylase. It has been used in the treatment of pheochromocytoma. It has been demonstrated to inhibit the production of melanin. It is available as a generic medication.
Non-player characters also play an active role in progression. Security guards can accompany Freeman during combat and can be used to access certain areas, while scientists provide information and help establish the circumstances surrounding the disaster at Black Mesa. Their presence also contributes to the game's environmental storytelling, as conversations and scripted interactions occur directly within the playable environment instead of being presented through conventional cinematics. Scripted sequences are used throughout the game to introduce characters, enemies, locations, and major events without removing control from the player. Contemporary reviewers highlighted this approach as one of the game's principal innovations, noting that important events could unfold naturally while the player remained in the first-person viewpoint. These sequences can also function as gameplay encounters: enemies may emerge during scripted events, areas may change while the player is moving through them, and environmental hazards can alter the player's immediate objectives. There are relatively few conventional boss battles. Instead, several powerful creatures function as major encounters in which the player is expected to exploit the environment rather than simply overwhelm the enemy with weapons. This design is particularly evident in encounters involving large alien organisms, where understanding the surrounding machinery or terrain can be more important than dealing direct damage.
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.
Sealed lyophilised powder is normally kept at minus twenty degrees Celsius or below, away from light and moisture. Vials are allowed to reach room temperature before opening to limit condensation. Repeated warming and cooling of the same vial is discouraged.