Everything below concerns AEDG peptide. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-02-03. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
Published evidence comes mainly from Russian-language journals and from a single research group, with small sample sizes and limited independent replication. A few laboratories outside that group have examined related peptides and reported weaker or absent telomerase effects, so the central claim is best described as contested rather than settled. Rodent studies report modest changes in some ageing markers and in survival, but designs vary and control conditions are often sparse. No large randomised trial in humans has been published, and long-term safety data in healthy populations are correspondingly thin.
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.
Disease is likely triggered in the genetically predisposed by some environmental factor, such as pollutants, xenobiotics (e.g., chemicals in makeup), diet, drugs, stress, and infectious agents. Urinary tract infection with E. coli is a particularly strong risk factor for PBC. A possible explanation is that E. coli possess a similar PDC-E2 as humans which could trigger autoimmunity via molecular mimicry.
== Further reading == Bowie, Andrew. Adorno and the Ends of Philosophy, Cambridge: Polity 2013 Brunger, Jeremy (5 May 2015). "The Administered World of Theodor Adorno". Numéro Cinq magazine. Delanty, Gerard (ed.) Theodor W. Adorno. London: SAGE, 2004. Edwards, Peter. "Convergences and Discord in the Correspondence Between Ligeti and Adorno", Music & Letters, 96/2, 2015. Gerhardt, Christina Archived 17 April 2022 at the Wayback Machine (ed.). "Adorno and Ethics". New German Critique 97 (2006): 1–3. Hogh, Philip. Communication and Expression: Adorno's Philosophy of Language. Translated by Antonia Hofstätter. London and New York: Rowman & Littlefield International, 2017. Gordon, Peter. Adorno and Existence. Cambridge, MA/London: Harvard University Press, 2016. Hohendahl, Peter Uwe. Prismatic Thought: Theodor W. Adorno. Lincoln, Nebr.: University of Nebraska Press, 1995. Jarvis, Simon. Adorno: A Critical Introduction. Cambridge: Polity, 1998. Jay, Martin. The Dialectical Imagination: A History of the Frankfurt School and the Institute for Social Research 1923–1950. Berkeley and Los Angeles: University of California Press, 1996. Jay, Martin. Adorno. Cambridge, Mass: Harvard University Press, 1984. Jeffries, Stuart. Grand Hotel Abyss: The Lives of the Frankfurt School. New York: Verso, 2016. Morgan, Ben. "The project of the Frankfurt School", Telos, Nr. 119 (2001), 75–98 Paddison, Max. Adorno's Aesthetics of Music. Cambridge: Cambridge University Press, 1993. Paddison, Max. Adorno, Modernism and Mass Culture: Essays on Critical Theory. London: Kahn & Averill, 2004.
While modern identification of mushrooms is quickly becoming molecular, the standard methods for identification are still used by most and have developed into a fine art harking back to medieval times and the Victorian era, combined with microscopic examination. The presence of juices upon breaking, bruising-reactions, odors, tastes, shades of color, habitat, habit, and season are all considered by both amateur and professional mycologists. Tasting and smelling mushrooms carries its own hazards because of poisons and allergens. Chemical tests are also used for some genera. In general, identification to genus can often be accomplished in the field using a local field guide. Identification to species, however, requires more effort. A mushroom develops from a button stage into a mature structure, and only the latter can provide certain characteristics needed for the identification of the species. However, over-mature specimens lose features and cease producing spores. Many novices have mistaken humid water marks on paper for white spore prints, or discolored paper from oozing liquids on lamella edges for colored spored prints.
Identified in the early 20th century, human chorionic gonadotropin (hCG) is a glycoprotein hormone that rises quickly in the first few weeks of pregnancy, typically reaching a peak at 8- to 10-weeks gestational age. hCG is produced by what will become the placenta. hCG testing can be performed with a blood (serum) sample (typically done in a medical facility) or with urine (which can be performed in a medical facility or at home). The assays used to detect the presence of hCG in blood or urine are generally reliable and inexpensive. Secretion of hCG can occur as soon as 6 days following ovulation and on average 8–10 days following ovulation; this is the earliest hCG can be detected in a blood sample. The hCG concentration in blood is higher than in urine. Therefore, a blood test can be positive while the urine test is still negative. Qualitative tests (yes/no or positive/negative results) look for the presence of the beta subunit of human chorionic gonadotropin in blood or urine. For a qualitative test the thresholds for a positive test are generally determined by an hCG cut-off where at least 95% of pregnant women would get a positive result on the day of their first missed period. Qualitative urine pregnancy tests vary in sensitivity. High-sensitivity tests are more common and typically detect hCG levels between 20 and 50 milli-international units/mL (mIU/mL). Low-sensitivity tests detect hCG levels between 1500 and 2000 mIU/mL and have unique clinical applications, including confirmation of medication abortion success.
Sources: en.wikipedia.org
In late August 2013, Starbucks announced its first store in Colombia at a press conference in Bogotá, where the company's CEO explained, "Starbucks has always admired and respected Colombia's distinguished coffee tradition." In May 2014, Starbucks announced its first café in Bolivia would open in 2014 in Santa Cruz de la Sierra and the first in Panama in 2015. In January 2016, Starbucks announced that it would launch operation in Trinidad and Tobago. On August 29, 2016, Starbucks opened its first store at South Park Mall in San Fernando. In November 2017, Starbucks commenced operations in Jamaica, where the first store opened in the resort city of Montego Bay on the shores of the Doctor's Cave Beach Club, offering views of the Caribbean Sea. The company also reaffirmed its commitment to working with local coffee farmers to "implement systems to increase productivity and yields, while also increasing compliance to international standards". Starbucks Jamaica opened its first store on November 21, 2017, with plans to open 15 locations island-wide over a 5-year period. Starbucks Jamaica opened stores at the Sangster International Airport in Montego Bay and at the Falmouth Pier, in Falmouth, Jamaica. Starbucks Jamaica announced plans to open up to six stores in Kingston, Jamaica, by 2019. The first of the Kingston stores opened on June 21, 2018. The second store is in Kingston's central business district, New Kingston.
== Early life == Farthing was born on 22 April 1953 in Christchurch, New Zealand. His father was an accountant and his mother was a music teacher. He was educated at Christ's College, Christchurch, an independent boys school. As a child he had considered entering the priesthood. He went on to study medicine at the University of Otago in Dunedin.
=== Cardiovascular safety === The cardiovascular safety profile of dapoxetine has been studied extensively during the drug development. Phase I trials showed that dapoxetine had neither clinically significant electrocardiographic effects nor delayed repolarization effects, with dosing up to four-fold greater than the maximum recommended dosage, which is 60 mg. Phase III studies in men with PE showed a safety and well tolerated profile of dapoxetine with dosing of 30 and 60 mg. No cardiovascular adverse had been found.
August 3: Francisco Macias Nguema was deposed by a coup led by Teodoro Obiang Nguema Mbasogo. September: Nur Mohammed Taraki, The Marxist president of Afghanistan, is deposed and murdered. The post of president is taken up by Prime Minister Hafizullah Amin. November 4: Islamist Iranian students take over the American embassy in support of the Iranian Revolution. The Iran hostage crisis lasts until January 20, 1981. November 20–December 4: Juhayman al-Otaybi and his followers seized the Grand Mosque in Mecca, Saudi Arabia. December 12: NATO Double-Track Decision – NATO offers mutual limitation of ballistic missiles combined with the threat that in case of disagreement NATO would deploy more middle-range nuclear weapons in Western Europe. December 21: The Rhodesian Bush War ends with the signing of the Lancaster House Agreement. Zimbabwe is granted independence from the United Kingdom. December 25: The Soviet Union invades Afghanistan to oust Hafizullah Amin, beginning the Soviet–Afghan War and resulting in the end of Détente.
== Applications == PEDOT:PSS has the highest efficiency among conductive organic thermoelectric materials (ZT~0.42) and thus can be used in flexible thermoelectric generators. Yet its largest application is as a transparent, conductive polymer with high ductility. For example, AGFA coats 200 million photographic films per year with a thin, extensively-stretched layer of virtually transparent and colorless PEDOT:PSS as an antistatic agent to prevent electrostatic discharges during production and normal film use, independent of humidity conditions, and as electrolyte in polymer electrolytic capacitors. PEDOT:PSS is commonly used in organic light emitting diode (OLED) and organic solar cell for hole injection or hole extraction to improve carrier transport. If organic compounds, including high boiling solvents like methylpyrrolidone, dimethyl sulfoxide, sorbitol, ionic liquids and surfactants, are added conductivity increases by many orders of magnitude. This makes it also suitable as a transparent electrode, for example in touchscreens, organic light-emitting diodes, flexible organic solar cells and electronic paper to replace the traditionally used indium tin oxide (ITO). Owing to the high conductivity (up to 4600 S/cm), it can be used as a cathode material in capacitors replacing manganese dioxide or liquid electrolytes. It is also used in organic electrochemical transistors.
Sources: en.wikipedia.org
== The aerobic 4S pathway == The 4S pathway is a sulfur-specific metabolic pathway of oxidative desulfurization that converts dibenzothiophene (DBT) into 2-hydroxybiphenyl and sulfite. It uses a total of four NADH molecules (three required by DszD to generate FMNH2 and a fourth to regenerate the FMN-oxide byproduct of DszA) and three molecules of oxygen, thus producing NAD+ and water as byproducts.
== Research areas == RCB engages in contemporary research at the interface of disciplines constituting biotechnology in its broadest definition. Research programmes aim to integrate science, engineering, medicine and agriculture in biotechnology and emphasize on their relevance to the regional societies. A broad range of research areas planned include:
=== Forensics === These flies are among the most important insect evidence in forensic science, specifically for obtaining time of colonization (TOC) and post mortem interval (PMI). Calliphora species are the most important in temperate regions because of their growth rate in accordance to temperature. By knowing the temperature, the amount of time since the eggs were laid can be estimated. In addition, C. vomitoria has higher threshold temperature for growth than many species; likewise, it is present in many regions. There is a limit to their usage, though, as few species can survive in cold temperatures; most cannot continue development unless it is warmer than roughly 2 °C (36 °F). Degradation of carcasses can be divided into six separate stages: stage of decomposition, fresh stage, bloated stage, active decay stage, advanced decay stage, and remains stage. Adult C. vomitoria first starts to appear at carcasses during the bloated stage, followed by larvae 1 to 3 days after. During the active decay stage, the blowfly larvae population reaches its peak. In buried corpses, information of time since burial and how the body was kept (above/below ground before burial) can also be collected through the identification of C. vomitoria. The study of these flies, however, is limited to areas where entomologists are readily available, as life histories can differ in separate regions. These life histories differ in subtle ways due to differences in climate such as temperature and elevation.
=== Establishment === The British South Africa Police's Special Branch began pseudo operations to collect intelligence in 1966. The Rhodesian Army took part in a joint trial using these tactics with the British South Africa Police and Special Branch that year, but it was not successful for at that stage the black population was largely indifferent to the insurgents and so not able to provide intelligence on them. The ZANLA began to gain control over north-eastern Rhodesia from 1971, and considerably strengthened its influence over the population in the region over the next year. This led to the networks of informers who had provided information to the Rhodesian Government ceasing to do so, which made it difficult for the security forces to locate and counter the insurgents. In response, Special Branch began to establish pseudo teams in January 1973. The Rhodesian Army also formed two such teams in February; these comprised members of C Squadron 22 (Rhodesian) SAS, black soldiers from the Rhodesian African Rifles and former insurgents. These teams enjoyed success, leading to a decision to expand pseudo operations. Major Ronald Francis Reid-Daly was selected to command the unit that became the Selous Scouts in November 1973. He was personally selected for this role by Lieutenant General Peter Walls, the head of the Rhodesian Army. An initial group of 25 personnel were selected and trained at Makuti near Lake Kariba. The first troop completed training and began operations in January 1974, followed by two other troops in February and March that year.
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.