Everything below concerns Certificate of analysis. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-10-31. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
Identity and purity are checked by reversed-phase high-performance liquid chromatography, usually with ultraviolet detection near 214 nanometres, where the peptide bond absorbs. Mass spectrometry confirms the expected mass and reveals whether truncation products or adducts are present. Acid hydrolysis followed by amino acid analysis gives the residue ratio, which should approximate one alanine, one glutamate, one aspartate and one glycine. Counter-ions such as acetate or trifluoroacetate remain in the dried product and lower net peptide content, so a stated purity figure on a label does not by itself describe how much peptide a vial holds.
Laboratory work has examined effects on telomerase activity in cultured cells, on melatonin rhythms in animals, and on markers of oxidative stress. Some experiments report measurable changes while others show none, and the reported findings rest largely on small studies. The absence of large independent trials means the generality of these results is unresolved rather than settled. Review articles occasionally apply the label geroprotector, a term that reflects a research hypothesis about ageing rather than an established clinical finding.
Epitalon is the common name for a synthetic tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, usually abbreviated AEDG. All four residues are proteinogenic amino acids, and the free peptide has a calculated mass near 390 grams per mole. Because the chain is short and carries no modifications, it is assembled readily by solid-phase synthesis and is distributed mainly as a freeze-dried solid for laboratory work. Catalogue listings use the spellings epitalon, epithalone, and simply AEDG, and the three refer to the same sequence.
The compound is generally presented as a synthetic fragment of epithalamin, a pineal gland extract investigated in the former Soviet Union from the 1970s onward. Vladimir Khavinson and colleagues in Saint Petersburg developed short peptides modelled on such extracts, and epitalon became the most widely cited of those sequences. Most primary reports appeared in Russian-language journals or in proceedings with limited international circulation. Independent replication in laboratories outside that network remains sparse, and much repeated secondary material traces back to a small number of originating groups.
| Property | Value | Notes |
|---|---|---|
| Storage temperature, solid | Approximately -20 C | Sealed, desiccated, protected from light |
| Typical identity method | Electrospray mass spectrometry | Protonated ion expected near 391 |
| Typical purity method | Reversed-phase HPLC | Ultraviolet detection near 214 nm |
| Common synonyms | Epithalon, epithalone, AEDG | Spelling variants appear in supplier catalogues |
| Solution stability | Days at 2-8 C | Hydrolysis and deamidation limit shelf life |
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.
The most frequently cited laboratory finding is that AEDG increased telomerase activity and extended telomere length in cultured human somatic cells. That work used fetal fibroblast strains and reported changes in enzyme activity alongside altered division counts. Replication by unrelated groups has been limited, and the published record is largely a single-laboratory series rather than a multi-centre programme. The result supports a hypothesis about peptide influence on gene expression in cell culture; it does not by itself establish an effect on telomere length in living animals or in people.
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.
The compound is generally described as a synthetic analogue of a fragment isolated from a pineal gland extract. Researchers associated with the Saint Petersburg Institute of Bioregulation and Gerontology introduced it during the 1980s and 1990s while studying short peptides from animal tissue. The original extract, called epithalamin, is a heterogeneous mixture, whereas epitalon is a single defined sequence. That distinction matters because findings reported for the extract are not automatically findings about the pure tetrapeptide, and claims about broader biological effects remain a separate question from the chemical identity described here.
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.
Regulatory status varies by country and is not harmonized. Epitalon is not an approved drug in major Western jurisdictions. In some countries it is sold as a research chemical, and in others it has appeared in products marketed for other categories. This inconsistent status means that purity, labeling accuracy, and documentation differ widely between suppliers, and verification of identity and purity through independent analysis is the usual way buyers assess a given lot.
Epitalon appears in the literature primarily through a small number of research groups, most of them associated with the St. Petersburg Institute of Bioregulation and Gerontology. Publications describe cell culture experiments, animal studies, and a limited number of small human studies. Independent replication outside this network is sparse. As a result, reviews of the topic usually separate descriptive reports of observed effects from the question of whether those effects generalize, and they note the difficulty of comparing studies that use different preparations and endpoints.
Discussions in the literature often conflate three distinct entities: the pineal extract epithalamin, the isolated tetrapeptide AEDG, and commercial preparations sold under similar names. Reviews citing older Russian-language studies sometimes omit detail on purity, route of administration and control groups, which makes cross-study comparison difficult. Researchers working with the compound generally note the need for independent replication, standardized enzyme assays, and clearer reporting of peptide identity. These caveats are relevant when weighing claims that appear in secondary sources rather than in primary reports.
（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.
More surface area Small volume The higher the surface area and volume, the particles become stronger, more stable and durable Materials may change electrical, optical, physical, chemical, or biological properties at the nano level Makes chemical and biological reactions easier Current commercial water purifiers using nanotechnology include the LifeSaver bottle, Lifesaver Jerrycan, Lifesaver Cube, Nanoceram, and NanoH2O.
It is a five-track album featuring two extended multi-chapter songs, "The Necromancer" and "The Fountain of Lamneth". Some critics said Caress of Steel was unfocused and an audacious move for the band because of the placement of two back-to-back protracted songs, as well as a heavier reliance on atmospherics and storytelling, a large deviation from Fly by Night. Intended to be their breakthrough album, Caress of Steel sold below expectations. The tour consisted of smaller venues and declining box office receipts, which led to it being nicknamed the Down the Tubes Tour.
=== Burden of illness === Sjögren's disease is associated with a high burden of illness, and has been shown to markedly reduce quality of life (QoL), with a significant impact on the ability to work resulting from increased rates of disability. The reduction in QoL is similar to that seen in other chronic conditions such as rheumatoid arthritis, lupus, and fibromyalgia.
Graphite (graphene) oxide has also been prepared by using a "bottom-up" synthesis method (Tang-Lau method) in which the sole reagent source is glucose; the process is safer, simpler, and more environmentally friendly compared to the traditional "top-down" method, in which strong oxidizers are involved. Another important advantage of the Tang-Lau method is the control of thickness, ranging from monolayer to multilayers, by adjusting growth parameters.
Target identification provides resources important for searching drug targets with information on genome annotation, proteome annotation, potential targets, and protein structure. Virtual screening compiles resources important for virtual screening as QSAR techniques, docking QSAR, cheminformatics, and siRNA/miRNA. Drug design provides resources important for designing drug inhibitors/molecules, such as lead optimization, pharmacoinformatic, ADMET, and clinical informatics.
Sources: en.wikipedia.org
By the time of Confucius in the late Zhou, gastronomy had become a high art. Confucius discussed the principles of dining: The rice would never be too white, the meat would never be too finely cut... When it was not cooked right, man would not eat. When it was cooked bad, man would not eat. When the meat was not cut properly, man would not eat. When the food was not prepared with the right sauce, man would not eat. Although there are plenty of meats, they should not be cooked more than staple food. There is no limit for alcohol, before a man gets drunk. The Lüshi chunqiu notes: "Only if one is chosen as the Son of Heaven will the tastiest delicacies be prepared [for him]." The Zhaohun (4–3rd c. BC) gives some examples: turtle ragout, honey cakes and beer (chilled with ice). During Shi Huangdi's Qin dynasty, the empire expanded into the south. By the time of the Han dynasty, the different regions and cuisines of China's people were linked by major canals and leading to greater complexity in the different regional cuisines. Not only is food seen as giving "qi", energy, but the food is also about maintaining yin and yang. The philosophy behind it was rooted in the I Ching and Chinese traditional medicine: food was judged for color, aroma, taste, and texture and a good meal was expected to balance the Four Natures ('hot', warm, cool, and 'cold') and the Five Tastes (pungent, sweet, sour, bitter, and salty). Salt was used as a preservative from early times, but in cooking was added in the form of soy sauce, and not at the table.
In over 50 cases between 1887 and the early 1990s, prosecutors charged Christian Scientists after adults and children died of treatable illnesses without medical care. The death in 1967 of five-year-old Lisa Sheridan of pneumonia, in Cape Cod, Massachusetts, was the first of several in the 20th century known within the church as the "child cases," according to Fraser. Her mother was convicted of manslaughter and sentenced to five years' probation. It was after this prosecution that the church began lobbying for religious exemptions. In 1977, 16-month-old Matthew Swan died of bacterial meningitis in Detroit, Michigan, after his parents were persuaded not to seek timely medical care; they responded by founding Children's Healthcare is a Legal Duty (CHILD) in 1983. Between 1980 and 1990, seven Christian Scientist parents in the United States were prosecuted; there were four convictions, two overturned. In 1988, 12-year-old Ashley King died in Phoenix, Arizona, after living for months with a tumor on her leg that had a 41-inch (1,000 mm) circumference. Her parents pleaded guilty to reckless endangerment. A prominent case in Massachusetts was Commonwealth v. Twitchell in 1990, which saw the parents of two-year-old Robyn Twitchell convicted of involuntary manslaughter after he died of peritonitis. The conviction was overturned; the appellate court ruled that the couple had "reasonably believed" they could rely on Christian Science prayer without being prosecuted.
=== Gamma === Gamma motor neurons, unlike alpha motor neurons, are not directly involved in muscle contraction. The nerves associated with these neurons do not send signals that directly adjust the shortening or lengthening of muscle fibers. However, these nerves are important in keeping muscle spindles taut.
== Diagnosis == Doctors formerly diagnosed cachexia mainly by looking at changes in body weight. A person was considered to have cachexia if they had a low BMI or unwanted weight loss of more than 10%. However, weight alone is not always a reliable method. Factors like fluid buildup (edema), tumor size, and obesity can make it difficult to diagnose cachexia. These weight-based criteria do not account for muscle loss, which is a key part in cachexia. . To improve diagnosis of cachexia, experts proposed adding lab tests and symptom evaluations. With that, a person might have cachexia if they lost at least 5% of their total body weight in 12 months or had a BMI under less 22 kg/m2 with at least three of the following: weak muscles, fatigue, loss of appetite, low muscle mass, or abnormal labs. There have been attempts to define specific types of cachexia, such as cardiac cachexia, which can occur in people with congestive heart failure. However, it has no widely accepted definition.
"It is the beginningless round of rebirths that is called the 'Wheel of the round of rebirths' (saṃsāracakka). Ignorance (avijjā) is its hub (or nave) because it is its root. Ageing-and-death (jarā-maraṇa) is its rim (or felly) because it terminates it. The remaining ten links [of Dependent Origination] are its spokes [i.e. saṅkhāra up to the process of becoming, bhava]."
Sources: en.wikipedia.org
This allows other ants to detect what task group (e.g., foraging or nest maintenance) other colony members belong to. In ant species with queen castes, when the dominant queen stops producing a specific pheromone, workers begin to raise new queens in the colony. Some ants produce sounds by stridulation, using the gaster segments and their mandibles. Sounds may be used to communicate with colony members or with other species.
In 1908, the Russian foreign minister, Alexander Izvolsky, offered Russian support, for the third time, for the annexation of Bosnia and Herzegovina by Austria-Hungary, in exchange for Austrian support for the opening of the Bosporus Strait and the Dardanelles to Russian warships. Austria's foreign minister, Alois von Aehrenthal, pursued this offer vigorously, resulting in the quid pro quo understanding with Izvolsky, reached on 16 September 1908 at the Buchlau Conference. However, Izvolsky made this agreement with Aehrenthal without the knowledge of Tsar Nicholas II or his government in St. Petersburg, or any of the other foreign powers including Britain, France and Serbia. Based upon the assurances of the Buchlau Conference and the treaties that preceded it, Franz Joseph signed the proclamation announcing the annexation of Bosnia-Herzegovina into the Empire on 6 October 1908. However a diplomatic crisis erupted, as both the Serbs and the Italians demanded compensation for the annexation, which the Austro-Hungarian government refused to entertain. The incident was not resolved until the revision of the Treaty of Berlin in April 1909, exacerbating tensions between Austria-Hungary and the Serbs.
=== 2007 === Davey made his AFL debut in the opening round of the 2007 season, making an immediate impression and played in every game until Round 14. He has featured several times amongst the Bombers' best including an outstanding ANZAC Day match. In his first five AFL matches he earned five “goal of the year” nominations including two on ANZAC Day. Davey became known for his explosive speed. He has been known to take 2.75 secs to run from 0–20 metres. This is thought to be the fastest in the league, even more than speedster Chris Judd. From debut, Davey became one of the shortest players in the AFL. He quickly earned a cult following at Essendon, gaining the nickname is "Froggy", due to his appearance. During the round 14 game against Geelong, he suffered a broken arm when crashed into while on the ground by Kane Tenace. The injury forced Davey to miss the rest of the season, and Essendon's form slumped during the period that he was on the sidelines, eventually missing the finals. At the end of the 2007 AFL season, Alwyn won the AFL Army Award, recognising players who produce act(s) of bravery or selflessness to promote the cause of his team, during a game for his smother and 2nd and 3rd efforts against Hawthorn in round 6. He had 3 of the final 6 nominations in the award.
In the drug discovery process of a 5-HT2C agonist, a pharmacophore module has been used to discover novel 5-HT2C receptor ligands. The pharmacophore has four features; one aromatic ring, two hydrophobic features and one positive ionizable feature. Figure 4 shows an example of a compound that fits the agonist pharmacophore perfectly. The nitrogen atom of piperazine fits the positive ionizable feature, the benzofuran part fits the aromatic ring and one hydrophobic, and the trifluoromethane part fits another hydrophobic feature of the pharmacophore.
Sources: en.wikipedia.org
The solid is kept cold, dry and dark, typically at minus twenty degrees Celsius, in a sealed container with desiccant. Dissolved material is kept refrigerated and used promptly. Freezing and thawing a solution repeatedly is avoided because it accelerates degradation.
Reversed-phase chromatography with ultraviolet detection gives a purity percentage, while mass spectrometry confirms identity. Amino acid analysis checks the residue composition. Buyers typically request a certificate of analysis showing these measurements for the specific lot.
It is not authorised as a medicine in the United States or the European Union. Material is sold there as a research chemical or cosmetic ingredient. Some related short peptides are registered drugs in Russia, which is a distinct national situation rather than a general approval.
It is a four-amino-acid peptide with the sequence alanine-glutamate-aspartate-glycine. The chain is unmodified and contains only standard proteinogenic residues, which makes it straightforward to produce by solid-phase synthesis and to characterise by standard peptide methods.