A practical reference on Telomerase: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2025-11-05 and is reviewed periodically as new material appears.
Storage practice centres on limiting moisture, oxygen, and repeated temperature cycling. Freeze-dried powder is generally held desiccated at minus twenty degrees Celsius or colder and protected from light. Reconstituted solutions are markedly less stable, and the aspartate-glycine junction is prone to succinimide formation at neutral to mildly alkaline pH. Portioning material into single-use aliquots reduces degradation compared with repeated freeze-thaw cycles. Stability data specific to this tetrapeptide remain scarce, so most handling guidance is extrapolated from general peptide chemistry rather than measured directly.
Documentation accompanying research peptides usually includes a certificate of analysis listing the batch number, purity figure, and test methods applied. Buyers comparing suppliers should check whether the reported purity refers to chromatographic area or to a mass-balance calculation, because the two are not equivalent. Counter-ion content, residual solvents, and water content are sometimes omitted from such certificates even though they affect the actual peptide mass present. Independent verification through a second laboratory is the most direct way to confirm that a supplied material matches its label.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Freeze-dried solid |
| Solubility class | Freely soluble in water | Aqueous buffers also suitable |
| Typical storage temperature | Minus 20 degrees Celsius or colder | Desiccated and light protected |
| Typical analytical method | RP-HPLC with UV detection | 214 nm on C18 column |
| Identity confirmation | Electrospray mass spectrometry | Sequence verified separately |
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.
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.
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.
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.
Human data are limited to small studies, often without the randomization, blinding, or control groups expected in contemporary clinical research. Reported outcomes have included changes in melatonin levels, immune markers, and subjective measures, but sample sizes were generally too small to support firm conclusions. Some reviews treat the peptide as promising while noting methodological weaknesses; others question whether the observed effects are specific. The compound is frequently discussed in longevity-focused communities, where enthusiasm often outpaces the published evidence. Separating established findings from speculation is therefore important when reading summaries of this research.
Epitalon emerged from research conducted in Saint Petersburg by Vladimir Khavinson and colleagues, who studied short peptides as potential regulators of aging. The work built on epithalamin, a pineal gland extract reported to influence neuroendocrine function. Epitalon was designed as a synthetic counterpart with a defined sequence, allowing reproducible experiments that extracts could not support. Early publications described effects on melatonin rhythms and lifespan in animal models. These findings circulated mainly in Russian-language journals during the 1990s, which limited their visibility among English-speaking researchers.
The most widely cited claim is that epitalon activates telomerase and thereby extends telomere length. Supporting evidence comes largely from cultured human cells, where treatment was associated with increased telomerase activity and delayed replicative senescence. Telomerase activation is a biologically consequential effect, since the enzyme is largely silenced in most somatic cells. However, the route by which a short peptide would reach and act on the enzyme's regulatory machinery has not been established. Independent replication in human trials is scarce, so the link between cell-culture observations and whole-body aging remains an open question.
== Research directions == Primary sclerosing cholangitis (PSC) is one of the most common cholestatic liver diseases, yet treatment options remain limited. Treatment for primary biliary cholangitis (PBC) is often done with ursodeoxycholic acid (UDCA) and with no other suitable alternative, it poses a problem for those that are not responsive to (UDCA). However, with advancing technology in the molecular biochemistry field and higher understanding of bile acid regulation, novel pharmacological treatments have been considered. For patients with primary biliary cholangitis, current guidelines recommend about 13–15 mg/kg of ursodeoxycholic acid as a first line treatment. This drug stimulates biliary bicarbonate secretion, improves survival without having to resort to a liver transplantation, and is very well tolerated—making it an ideal treatment. However, around 40% of patients with primary biliary cholangitis are not responsive to UDCA. Obeticholic acid has been approved by the US Food and Drug Administration for PBC in 2016 after experiments found beneficial improvements for the liver in half of patients with inadequate response to UDCA. Primary sclerosing cholangitis is a challenging liver disease as treatment options are limited. There is still uncertainty about the efficacy of ursodeoxycholic acid for PSC and researchers offer conflicting recommendations. One study found UDCA had improved biochemical functions but did lower the rate for death or transplant-free survival.
=== Federal government === President Luiz Inácio Lula da Silva Vice President Geraldo Alckmin President of the Chamber of Deputies Hugo Motta President of the Federal Senate Davi Alcolumbre President of the Supreme Federal Court Edson Fachin
As of 2017, lithium was marketed under many brand names worldwide, including Cade, Calith, Camcolit, Carbolim, Carbolit, Carbolith, Carbolithium, Carbonato de Litio, Carboron, Ceglution, Contemnol, Efadermin (Lithium and Zinc Sulfate), Efalith (Lithium and Zinc Sulfate), Elcab, Eskalit, Eskalith, Frimania, Hypnorex, Kalitium, Karlit, Lalithium, Li-Liquid, Licarb, Licarbium, Lidin, Ligilin, Lilipin, Lilitin, Limas, Limed, Liskonum, Litarex, Lithane, Litheum, Lithicarb, Lithii carbonas, Lithii citras, Lithioderm, Lithiofor, Lithionit, Lithium, Lithium aceticum, Lithium asparagicum, Lithium Carbonate, Lithium Carbonicum, Lithium Citrate, Lithium DL-asparaginat-1-Wasser, Lithium gluconicum, Lithium-D-gluconat, Lithiumcarbonaat, Lithiumcarbonat, Lithiumcitrat, Lithiun, Lithobid, Lithocent, Lithotabs, Lithuril, Litiam, Liticarb, Litijum, Litio, Litiomal, Lito, Litocarb, Litocip, Maniprex, Milithin, Neurolepsin, Plenur, Priadel, Prianil, Prolix, Psicolit, Quilonium, Quilonorm, Quilonum, Sedalit, Téralithe, and Theralite. Lithium is available as lithium carbonate in tablets or capsules, and as lithium citrate in liquid form. In the United States, standard release tablets are available in 300 mg. Standard release capsules come in strengths of 150 mg, 300 mg, and 600 mg. Slow release tablets are available in 300 mg and 450 mg. Liquid lithium, in the form of lithium citrate, is available as an 8 mEq/5 mL solution. In the United Kingdom, lithium is available as standard release tablets of 250 mg, while slow release tablets come in 200 mg, 400 mg and 450 mg.
21 July – Writing in the Sun on Sunday, Home Secretary Yvette Cooper announces that car washes and beauty salons will be targeted by immigration officials over the summer in a bid to crack down on businesses illegally hiring workers from overseas. Former Chancellor Jeremy Hunt, who was Health Secretary for a number of years before the COVID-19 pandemic, apologises "unreservedly" to the families of people who died from the illness after a report prepared by the COVID-19 Inquiry found significant flaws in the government's strategy for dealing with the pandemic. 22 July – Home Secretary Yvette Cooper confirms the UK government will resume processing asylum applications, including those from people who arrived in the UK illegally. She also tells the House of Commons the previous government's Rwanda asylum plan cost £700m, with only four people being removed to the country voluntarily. The shadow home secretary, James Cleverly, says Cooper's words are "hyperbole" and "made up numbers", adding that Labour had scrapped scheme on "ideological grounds" and that its purpose was as a deterrent. Launch of Skills England, a government body whose objective will be to reduce the need for overseas employees by improving skills training for people in England. 2024 Conservative Party leadership election: The Conservative Party's 1922 Committee sets out a timeline for the election of the next leader, with the successful candidate scheduled to be announced in early November. July 2024 Welsh Labour leadership election: Eluned Morgan becomes the first candidate to enter the leadership race.
=== Contagiousness === The higher the viral load value, the more viral elements there are in blood and other body fluids. For example, individuals with HIV are most contagious during the earliest (acute) stages of the infection, sometimes with millions of copies of HIV per centiliter of blood. According to one estimate, the majority of transmissions among gay men in the UK occur during primary infection. This is because, at this phase, the immune response is still developing. Antibody levels against the virus during acute infection are often too low to be detected, meaning that an antibody test for a highly infectious individual can come back negative. There is at least one documented case of an HIV-positive individual with an undetectable viral load infecting his partner. Nevertheless, two recent major studies of serodiscordant couples in which the positive partner had an undetectable viral load have found no linked transmission events despite at least some unprotected sex among the couples. HPTN 052, a third study, found one linked transmission event in a test group of 886 couples, although it is unclear whether the originally infected partner in this case had achieved an undetectable viral load at the time of transmission. Viral load in blood corresponds imperfectly to viral load in other parts of the body. Individuals with undetectable viral loads in their blood might not have undetectable viral loads in other bodily fluids, such as semen or vaginal secretions.
Sources: en.wikipedia.org
== Uses == Thorium has been suggested for use in thorium-based nuclear power. In many countries the use of thorium in consumer products is banned or discouraged because it is radioactive. It is currently used in cathodes of vacuum tubes, for a combination of physical stability at high temperature and a low work energy required to remove an electron from its surface. It has, for about a century, been used in mantles of gas and vapor lamps such as gas lights and camping lanterns.
Neutral Protamine Hagedorn (NPH) insulin, also known as isophane insulin, is an intermediate-acting insulin given to help control blood sugar levels in people with diabetes. The words refer to neutral pH (pH = 7), protamine a protein, and Hans Christian Hagedorn, the insulin researcher who invented this formulation. It is designed to improve the delivery of insulin, and is one of the earliest examples of engineered drug delivery. It is used by injection under the skin once to twice a day. Onset of effects is typically in 90 minutes and they last for 24 hours. Versions are available that come premixed with a short-acting insulin, such as regular insulin. The common side effect is low blood sugar. Other side effects may include pain or skin changes at the sites of injection, low blood potassium, and allergic reactions. Use during pregnancy is relatively safe for the fetus. NPH insulin is made by mixing regular insulin and protamine in exact proportions with zinc and phenol such that a neutral-pH is maintained and crystals form. There are human and pig insulin based versions. Protamine insulin was first created in 1936 and NPH insulin in 1946. It is on the World Health Organization's List of Essential Medicines. NPH is an abbreviation for "neutral protamine Hagedorn". In 2020, insulin isophane was the 221st most commonly prescribed medication in the United States, with more than 2 million prescriptions. In 2020, the combination of human insulin with insulin isophane was the 246th most commonly prescribed medication in the United States, with more than 1 million prescriptions.
Carbamic acid, which might also be called aminoformic acid or aminocarboxylic acid, is the chemical compound with the formula H2NCOOH. It can be obtained by the reaction of ammonia NH3 and carbon dioxide CO2 at very low temperatures, which also yields ammonium carbamate [NH4]+[NH2CO2]−. The compound is stable only up to about 250 K (−23 °C); at higher temperatures it decomposes into those two gases. The solid apparently consists of dimers, with the two molecules connected by hydrogen bonds between the two carboxyl groups –COOH. Carbamic acid could be seen as both an amine and carboxylic acid, and therefore an amino acid; however, the attachment of the carboxyl group –COOH directly to the nitrogen atom (without any intermediate carbon chain) makes it behave very differently from the amino acids with intermediate carbon chain. (Glycine NH2CH2COOH is generally considered to be the simplest amino acid.) The hydroxyl group –OH attached to the carbon also excludes it from the amide class. The term "carbamic acid" is also used generically for any compounds of the form RR′NCOOH, where R and R′ are organic groups or hydrogen. Deprotonation of a carbamic acid yields a carbamate anion RR′NCOO−, the salts of which can be relatively stable. Carbamate is also a term used for esters of carbamic acids, such as methyl carbamate H2N−C(=O)−OCH3. The carbamoyl functional group RR′N–C(=O)– (often denoted by Cbm) is the carbamic acid molecule minus the OH part of the carboxyl.
Algae also use chlorophyll, but various other pigments are present, such as phycocyanin, carotenes, and xanthophylls in green algae, phycoerythrin in red algae (rhodophytes) and fucoxanthin in brown algae and diatoms resulting in a wide variety of colors. These pigments are embedded in plants and algae in complexes called antenna proteins. In such proteins, the pigments are arranged to work together. Such a combination of proteins is also called a light-harvesting complex. Although all cells in the green parts of a plant have chloroplasts, the majority of those are found in specially adapted structures called leaves. Certain species adapted to conditions of strong sunlight and aridity, such as many Euphorbia and cactus species, have their main photosynthetic organs in their stems. The cells in the interior tissues of a leaf, called the mesophyll, can contain between 450,000 and 800,000 chloroplasts for every square millimeter of leaf. The surface of the leaf is coated with a water-resistant waxy cuticle that protects the leaf from excessive evaporation of water and decreases the absorption of ultraviolet or blue light to minimize heating. The transparent epidermis layer allows light to pass through to the palisade mesophyll cells where most of the photosynthesis takes place.
The club was founded by members of the Royal Agricultural Society, the Melbourne Hunt Club and the Victorian Woolbrokers. The Essendon Football Club is thought to have been formed in 1872 at a meeting in the home of a well-known brewery family, the McCrackens, whose Ascot Vale property hosted a team of local junior players. Robert McCracken (1813–1885), the owner of several city hotels, was the founder and first president of the Essendon Football Club, and his son, Alex McCracken, its first secretary. Alex later became president of the newly formed VFL. Alex's cousin Collier McCracken, who had already played with Melbourne, was the team's first captain. The club played its first recorded match against the Carlton Second Twenty (the reserves) on 7 June 1873, with Essendon winning by one goal. Essendon played 13 matches in its first season, winning seven, with four draws and losing two. The club was one of the inaugural junior members of the Victorian Football Association (VFA) in 1877, and it began competing as a senior club from the 1878 season. During its early years in the Association, Essendon played its home matches at Flemington Hill, but it moved to the East Melbourne Cricket Ground in 1881. In 1878, at Flemington Hill, Essendon played its first match on what would be considered by modern standards to be a full-sized field. In 1879, Essendon played Melbourne in one of the earliest night matches recorded when the ball was painted white.
Sources: en.wikipedia.org
Reversed-phase high-performance liquid chromatography with ultraviolet detection at 214 nanometres is the usual approach. Peak area percentage provides a purity figure relative to other components in the sample. Mass spectrometry is then applied to confirm identity.
Aspartate can cyclise into a succinimide intermediate that later hydrolyses back as isoaspartate. Both forms share the same molecular mass, so mass spectrometry alone cannot tell them apart. This shapes how purity data should be interpreted.
Freeze-dried material is normally kept desiccated below minus twenty degrees Celsius and shielded from light. Solutions are prepared shortly before use and held cold. Repeated thawing is avoided because it accelerates aggregation and degradation.
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.