The short version of AEDG fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-02-13 and is reviewed periodically as new material appears.
Laboratory handling begins with dissolution of the lyophilized powder in water or a suitable aqueous buffer. The dry solid is the more stable form, so stock solutions are generally prepared only when required and kept cold afterwards. Repeated freezing and thawing of a solution is avoided because it encourages aggregation and gradual loss of the intact chain. Diluents and containers are selected to limit adsorption of a short peptide onto plastic surfaces and to reduce microbial growth in aqueous preparations.
Stability depends strongly on pH, temperature and the presence of oxygen and trace metals. Cleavage of the backbone proceeds faster under neutral to alkaline conditions, whereas acidic solutions tend to slow that reaction. The aspartate and glutamate side chains can undergo deamidation or imide formation over time, generating closely related impurities. Published stability data specific to epitalon are sparse, so the usable life of a given solution is best regarded as an open question that depends on buffer composition, concentration and storage temperature.
Identity and purity are usually assessed by reversed-phase high-performance liquid chromatography with ultraviolet detection, frequently near 214 nanometers where the peptide bond absorbs. Mass spectrometry, most often with electrospray ionization, confirms the observed molecular mass and helps separate the intact peptide from truncated or modified forms. Amino acid analysis or tandem mass spectrometry can establish residue order. Purity is commonly quoted as an area percentage, yet such values are method-dependent, and comparisons between laboratories require matching column, gradient and detection wavelength.
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.
Most experimental work has been carried out in cell culture and animal models. Several reports describe changes in telomerase activity and proliferation in cultured cells, while rodent studies have examined lifespan, melatonin rhythm and reproductive endpoints. Human data remain limited, and much of the published clinical material consists of small trials with incomplete reporting of methods and controls. Whether the cell and animal findings translate into measurable effects in people is an open question, and the mechanistic basis of the reported telomerase changes is not fully established.
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.
| Property | Value | Notes |
|---|---|---|
| Storage temperature, dry powder | -20 degrees Celsius or lower | Sealed, dark, low humidity |
| Storage temperature, solution | 2 to 8 degrees Celsius | Short-term use expected |
| Primary purity method | Reversed-phase HPLC | Ultraviolet detection near 214 nm |
| Identity confirmation | Electrospray mass spectrometry | Compared with calculated mass |
| Typical purity specification | Area percent of 95 or higher | Depends on column and gradient |
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.
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.
vildagliptin (Galvus) EU Approved 2008 sitagliptin (Januvia) FDA approved Oct 2006 saxagliptin (Onglyza) FDA Approved July 2009 linagliptin (Tradjenta) FDA Approved May 2, 2011 alogliptin septagliptin teneligliptin gemigliptin (Zemiglo) DPP-4 inhibitors lowered hemoglobin A1C values by 0.74%, comparable to other antidiabetic drugs. A result in one RCT comprising 206 patients aged 65 or older (mean baseline HgbA1c of 7.8%) receiving either 50 or 100 mg/d of sitagliptin was shown to reduce HbA1c by 0.7% (combined result of both doses). A combined result of 5 RCTs enlisting a total of 279 patients aged 65 or older (mean baseline HbA1c of 8%) receiving 5 mg/d of saxagliptin was shown to reduce HbA1c by 0.73%. A combined result of 5 RCTs enlisting a total of 238 patients aged 65 or older (mean baseline HbA1c of 8.6%) receiving 100 mg/d of vildagliptin was shown to reduce HbA1c by 1.2%. Another set of 6 combined RCTs involving alogliptin (approved by FDA in 2013) was shown to reduce HbA1c by 0.73% in 455 patients aged 65 or older who received 12.5 or 25 mg/d of the medication.
Cloths come in various colours, sizes and designs and are worn during social and religious occasions. In a cultural context, kente is more important than just a cloth as it is a visual representation of history and also a form of written language through weaving. The term "kente" has its roots in the Akan word kɛntɛn, which means a basket, and the first kente weavers used raffia fibres to weave cloths that looked like kenten (a basket); and thus were referred to as kenten ntoma; meaning "basket cloth". Kente is also woven by the Ewe people (Ewe Kente) in the Volta Region. The main weaving centres are Agortime area and Agbozume. Agbozume has a kente market that attracts patrons from all over West Africa and the diaspora.
In Australian magazines, images of vulvas that do not look like "a single crease" are digitally modified to comply with the censorship standard. An Australian pornographic actress says that images of her own genitals sold to pornographic magazines in different countries are digitally manipulated to change the size and shape of the labia according to censorship standards in different countries. Community opposition to sex education limits the access that young women have to information about natural variation in labias. Linda Cardozo, a gynaecologist at King's College Hospital, London, told the newspaper that women were placing themselves at risk in an industry that is largely unregulated. Nina Hartley says that "she's seen every type of vulva in her three decades working in the industry.
Sources: en.wikipedia.org
In the USA and other countries it was discontinued gradually after the introduction of the electroconvulsive therapy during the 1940s and the first neuroleptic drugs during the 1950s. Dr. Sakel died from heart failure on December 2, 1957, in New York City, NY, USA.
1,8-Cineole 2-exo-monooxygenase (EC 1.14.14.56, CYP3A4) is an enzyme with systematic name 1,8-cineole,NADPH:oxygen oxidoreductase (2-exo-hydroxylating). This enzyme catalyses the following chemical reaction
An artery (from Greek ἀρτηρία (artēríā)) is a blood vessel in humans and most other animals that takes oxygenated blood away from the heart in the systemic circulation to one or more parts of the body. Exceptions that carry deoxygenated blood are the pulmonary arteries in the pulmonary circulation that carry blood to the lungs for oxygenation, and the umbilical arteries in the fetal circulation that carry deoxygenated blood to the placenta. It consists of a multi-layered artery wall wrapped into a tube-shaped channel. Arteries contrast with veins, which carry deoxygenated blood back towards the heart; or in the pulmonary and fetal circulations carry oxygenated blood to the lungs and fetus respectively.
Troponin, or the troponin complex, is a complex of three subunits of specialized regulatory proteins –troponin C, troponin I, and troponin T, that are components of the contraction mechanism in striated muscle. Measurements of cardiac-specific troponins I and T are extensively used as diagnostic and prognostic indicators in the management of myocarditis, myocardial infarction and acute coronary syndrome. Blood levels of cardiac troponin (cTn) may be used as a diagnostic marker for stroke or other myocardial injury that is ongoing, although the sensitivity of this measurement is low.
Sources: en.wikipedia.org
Damage during the emplacement surgery Damage during a thoracic surgery Chemical degradation of the silicone shell of the prosthesis Trauma: blunt trauma, penetrating trauma, blast trauma Mechanical pressure, e.g. capsular contracture and mammogram breast examination As a Class III medical device, the breast implant is an industrial product that eventually fails because of age and design flaws of material and manufacture; thus the rupture-and-deflation of a prosthetic breast is a medical-device failure resolved with the surgical explantation and replacement of the failed prosthetic breast with a new model of prosthetic breast. In that light, the Food and Drug Administration informed the women of the U.S. that breast implants are medical devices of finite shelf-life that wear out and fail. That the longer a woman has breast implants in her body — either saline solution or silicone gel — the greater the statistical likelihood of her experiencing the medical complications of the rupture-and-deflation failure of her prosthetic breasts. For Second-generation prosthetic breasts (silicone shell, single-lumen) designed in the 1970s, the rupture-deflation defect occurred at the rate of eight to fifteen per cent (8–15%) at the ten-year mark after the surgery; which occurred among fifteen to thirty per cent (15–30%) of the cohort of mammoplasty patients. The study Safety and Effectiveness of Mentor's MemoryGel Implants at 6 Years (2009) reported a medical-device rate of failure of one-point-one per cent (1.1%) at the six-year mark after the surgery.
Obsessional slowness is a controversial diagnosis, with presentations ranging from severe but common manifestations of obsessive compulsive disorder to catatonia. Down syndrome disintegrative disorder (or Down Syndrome Regression Disorder, DSDD / DSRD) is a chronic condition characterized by loss of previously acquired adaptive, cognitive and social functioning occurring in persons with Down syndrome, usually during adolescence or early adulthood. The clinical picture is variable, but often includes catatonic signs, which is why it was called "catatonic psychosis" in initial reports in 1946. DSDD seems to phenotypically overlap with obsessional slowness (see above) and catatonia-like regression occurring in ASD.
In 1963, a new Yugoslav Constitution was adopted, renaming the federal state into the Socialist Federal Republic of Yugoslavia, and its federal units into socialist republics, thus introducing the name: Socialist Republic of Serbia (Serbo-Croatian Cyrillic: Социјалистичка Република Србија). In 1966, one of the most prominent Serbs in the Communist party and also vice-president of Yugoslavia (1963–1966) and founder of Yugoslav intelligence agency OZNA, Aleksandar Ranković was removed from positions due to allegations of spying on SFRY President Josip Broz Tito. After the Croatian Spring in 1971, almost whole party leadership of Serbia was removed from office, under the charge of being "liberal". Latinka Perović and Marko Nikezić were marked as leaders of this liberal movement inside League of Communists of Serbia. In 1974, new constitution was adopted, increasing the powers of provinces, and making them de facto republics. For the first time the institution of president was formed, as President of the Presidency of Socialist Republic of Serbia. Assembly was electing 15 members of the presidency and one president for a 4-year term, and later 2-year term. The new constitution practically suspended Serbia's authority over the provinces. After the new constitution was adopted, Dragoslav Marković, then President of Serbia ordered a secret study on this issue.
=== Menopause === Progesterone is used in combination with an estrogen as a component of menopausal hormone therapy for the treatment of menopausal symptoms in peri- and postmenopausal women. It is used specifically to provide endometrial protection against unopposed estrogen-induced endometrial hyperplasia and cancer in women with intact uteruses. A 2016 systematic review of endometrial protection with progesterone recommended 100 mg/day continuous oral progesterone, 200 mg/day cyclic oral progesterone, 45 to 100 mg/day cyclic vaginal progesterone, and 100 mg alternate-day vaginal progesterone. Twice-weekly 100 mg vaginal progesterone was also recommended, but more research is needed on this dose and endometrial monitoring may be advised. Transdermal progesterone was not recommended for endometrial protection. The REPLENISH trial was the first adequately powered study to show that continuous 100 mg/day oral progesterone with food provides adequate endometrial protection. Cyclic 200 mg/day oral progesterone has also been found to be effective in the prevention of endometrial hyperplasia, for instance in the Postmenopausal Estrogen/Progestin Interventions (PEPI) trial. However, the PEPI trial was not adequately powered to fully quantify endometrial hyperplasia or cancer risk. No adequately powered studies have assessed endometrial protection with vaginal progesterone. In any case, the Early versus Late Intervention Trial with Estradiol (ELITE) found that cyclic 45 mg/day vaginal progesterone gel showed no significant difference from placebo in endometrial cancer rates.
=== Commanding officers === 1950 Lt Col Mike Calvert, Royal Engineers 1951 Lt Col John Sloane, Argyll and Sutherland Highlanders 1953 Lt Col Oliver Brooke, Welch Regiment 1954 Lt Col Michael Osborn, West Yorkshire Regiment 1955 Lt Col George Lea, Lancashire Fusiliers and Parachute Regiment 1957 Lt Col Tony Deane-Drummond, Royal Signals 1960 Lt Col Ronald Dare Wilson, Royal Northumberland Fusiliers 1962 Lt Col John Woodhouse, Dorset Regiment and East Surreys 1965 Lt Col Michael Wingate-Gray, Black Watch 1967 Lt Col John Slim, Argyll and Sutherland Highlanders 1969 Lt Col John Watts, Royal Irish Rangers 1972 Lt Col Peter de la Billière, Light Infantry 1974 Lt Col Anthony Jeapes, Devonshire and Dorset Regiment 1977 Lt Col Mike Wilkes, Royal Artillery 1982 Lt Col Mike Rose, Coldstream Guards 1984 Lt Col Andrew Massey, Royal Corps of Transport 1986 Lt Col Cedric Delves, Devonshire and Dorset Regiment 1989 Lt Col John Holmes, Scots Guards n/k Lt Col Jonathan "Jacko" Page, Parachute Regiment 2001 Lt Col Ed Butler, Royal Green Jackets 2002 Lt Col Mark Carleton-Smith, Irish Guards 2007 Lt Col Richard Williams, Parachute Regiment 2012 Lt Col Nick Perry, King's Royal Hussars
Sources: en.wikipedia.org
The dry powder is typically held at -20 degrees Celsius or lower, protected from light and moisture. Allowing a sealed vial to reach room temperature before opening reduces condensation on its contents. Conditions stated on a supplier certificate of analysis take precedence over general guidance.
Mass spectrometry supplies an observed molecular mass that is compared with the calculated value for the tetrapeptide. Reversed-phase chromatography then separates the main peak from related impurities. Neither technique alone establishes residue order, so sequence-level confirmation may call for tandem mass spectrometry or amino acid analysis.
No single published figure applies, because stability depends on pH, concentration, temperature and sterility. Cold storage slows hydrolysis without halting it, and microbial growth is a separate concern in non-sterile solutions. Most laboratories rely on their own analytical checks rather than a fixed expiry period.
It is a synthetic tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, often abbreviated AEDG. The molecule is linear and contains no modified residues, so it is fully described by its sequence.