This is a working overview of epithalamin, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2025-12-10 and is reviewed periodically as new material appears.
The molecule is a short, linear, hydrophilic peptide that dissolves readily in water or aqueous buffer. Its principal chemical liabilities are hydrolytic rather than oxidative, since it contains no cysteine, methionine, or tryptophan residues. The aspartate–glycine step is a recognised site for aspartimide formation under mildly acidic or basic conditions, generating isoaspartate and succinimide-related products over time. Desiccated lyophilised powder held at −20 °C is comparatively stable, whereas dilute solutions degrade faster and are best frozen as single-use aliquots rather than thawed repeatedly.
No pharmacopoeial monograph exists for this peptide, so quality rests on the supplier's internal specifications and on whatever independent testing a purchaser arranges. Certificates of analysis differ widely in which tests they report and in the limits applied. The counter-ion introduced during purification, commonly acetate or trifluoroacetate, changes the net peptide content of a given mass of powder, so two samples of equal weight may not contain equal amounts of the active sequence. Third-party laboratories can verify purity, identity, residual solvents, and counter-ion content for a fee, which makes documentation more informative than labelling.
Verification of a sample usually begins with reversed-phase high-performance liquid chromatography, which resolves the peptide from truncated sequences and other impurities and expresses purity as a percentage of total peak area. Mass spectrometry by electrospray ionisation or matrix-assisted laser desorption supplies an independent check, because the measured mass can be compared against the theoretical value for AEDG. Amino acid analysis or tandem mass spectrometry sequencing can confirm residue order. Each of these methods answers a different question: a purity figure does not establish identity, and an identity match does not establish how much of the material is intact peptide.
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.
| Property | Value | Notes |
|---|---|---|
| Identity confirmation | Electrospray or MALDI mass spectrometry | Observed mass compared with theoretical 390.35 Da |
| Purity specification | 95 percent or greater by RP-HPLC | Common convention for research-grade peptide |
| Counter-ion | Acetate or trifluoroacetate | Affects net peptide content of a weighed sample |
| Solution storage | −80 °C as single-use aliquots | Repeated freeze–thaw cycles accelerate loss |
| Main degradation route | Aspartimide formation at Asp-Gly | Produces isoaspartate and related species |
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.
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.
Reversed-phase high-performance liquid chromatography is the standard approach for assessing purity, usually with ultraviolet detection near 214 nm, where the peptide bond absorbs. Mass spectrometry, most often with electrospray ionization, confirms the molecular mass and helps reveal truncation or deletion byproducts. Amino acid analysis can verify composition, and counterion content is sometimes measured because peptides purified with trifluoroacetic acid retain variable amounts of that salt. Purity figures reported without a stated method and detection wavelength are difficult to interpret.
Material sold for research use varies widely in documented quality. A useful verification package includes a certificate of analysis that states peptide content rather than only net weight, the chromatographic method and column used, and a mass spectrum consistent with the expected mass. Independent testing by a third-party laboratory is occasionally reported. Statements of identity resting only on a supplier label provide little assurance, and the gap between nominal mass and actual peptide content can be substantial once counterions and residual water are counted.
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.
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.
Biko was neither a communist nor capitalist. Described as a proponent of African socialism, he called for "a socialist solution that is an authentic expression of black communalism". This idea was derided by some of his Marxist contemporaries, but later found parallels in the ideas of the Mexican Zapatistas. Noting that there was significant inequality in the distribution of wealth in South Africa, Biko believed that a socialist society was necessary to ensure social justice. In his view, this required a move towards a mixed economy that allowed private enterprise but in which all land was owned by the state and in which state industries played a significant part in forestry, mining, and commerce. He believed that, if post-apartheid South Africa remained capitalist, some black people would join the bourgeoisie but inequality and poverty would remain. As he put it, if South Africa transitioned to proportional democracy without socialist economic reforms, then "it would not change the position of economic oppression of the blacks". In conversation with Woods, Biko insisted that the BCM would not degenerate into anti-white hatred "because it isn't a negative, hating thing. It's a positive black self-confidence thing involving no hatred of anyone". He acknowledged that a "fringe element" may retain "anti-white bitterness"; he added: "we'll do what we can to restrain that, but frankly it's not one of our top priorities or one of our major concerns.
More studies are also needed in special populations like older adults. Another large RCT of methenamine for UTI prevention, the international European ImpresU trial in older women, which is comparing methenamine to placebo instead of against antibiotics, is underway as of 2022. Methenamine is not widely recommended by medical guidelines for UTI prevention as of 2022. However, this is expected to change in the near future due to the publication of the ALTAR trial and other new high-quality clinical trials. In addition to prescription methenamine, a lower-dose combination formulation of methenamine with the nonsteroidal anti-inflammatory drug (NSAID) sodium salicylate is available over-the-counter under brand names like Cystex for treatment and prevention of UTI symptoms. This formulation is much less-studied than prescription methenamine and little data are available to inform its use. Methenamine is provided mainly as methenamine hippurate (the hippuric acid salt) or methenamine mandelate (the mandelic acid salt). The drug is taken twice daily in the case of methenamine hippurate and four times daily in the case of methenamine mandelate. Methenamine hippurate is more popular and commonly used owing to its more convenient dosing schedule. Methenamine is taken three times daily in the case of formulations in which low-dose methenamine free base is combined with sodium salicylate. The dosing schedule of methenamine is less convenient than once-daily low-dose prophylactic antibiotics.
===== HIV ===== A breastfeeding child can become infected with HIV. Factors such as the mother's viral load complicate breastfeeding recommendations for HIV-positive mothers. The World Health Organization highlights the possibility of breastfeeding in mothers on anti-viral therapy and with undetectable viral loads, especially in areas where access to clean water is poor and where death from infectious diseases is common, citing low transmission rates when the mother is on anti-viral therapy. They also recommend that national authorities in each country decide which infant feeding practice should be promoted by their maternal and child health services to avoid transmitting HIV from mother to child. However, the CDC continues to recommend against HIV-positive mothers breastfeeding in the United States. Infant formula should only be given if this can be safely done.
Sources: en.wikipedia.org
Since the war, the US has had a continued presence of 5,000 troops stationed in Saudi Arabia – a figure that rose to 10,000 during the 2003 conflict in Iraq. Operation Southern Watch enforced the no-fly zones over southern Iraq set up after 1991; oil exports through the Persian Gulf's shipping lanes were protected by the Bahrain-based US Fifth Fleet. Since Saudi Arabia houses Mecca and Medina, Islam's holiest sites, many Muslims were upset at the permanent military presence. The continued presence of U.S. troops in Saudi Arabia after the war was one of the stated motivations behind the 11 September terrorist attacks, the Khobar Towers bombing, and the date chosen for the 1998 US embassy bombings (7 August), which was eight years to the day that US troops were sent to Saudi Arabia. Osama bin Laden interpreted the Islamic prophet Muhammad as banning the "permanent presence of infidels in Arabia". In 1996, bin Laden issued a fatwa, calling for US troops to leave Saudi Arabia. In a December 1999 interview with Rahimullah Yusufzai, bin Laden said he felt that Americans were "too near to Mecca" and considered this a provocation to the entire Islamic world.
== Genome == The cabbage looper genome is 368.2 Mb long (scaffold N50=14.2 Mb; contig N50=621.9 kb; GC content=35.6%) and includes 14,037 protein-coding genes and 270 microRNA (miRNA) genes. The genome and annotation are available at the Cabbage Looper Database. The cabbage looper genome is larger than the Drosophila melanogaster genome (180Mb) but smaller than the Bombyx mori genome (530mb). It encodes at least 108 cytochrome P450 enzymes, 34 glutathione S-transferases, 87 carboxylesterases, and 54 ATP-binding cassette transporters, some of which may be involved in its insecticide resistance. It has the ZW sex-determination system, where females are heterogametic (ZW) and males are homogametic (ZZ). Its telomeres contain (TTAGG)n repeats and transposons belonging to the non-long-terminal-repeat LINE/R1 family, similar to the silkworm. The PiggyBac Transposon, a widely used tool for genetic engineering, was originally discovered in the cabbage looper and subsequently identified in other taxa as well.
Trump stated that if he were elected, he would increase deportations, send the U.S. military to the border, expand U.S. Immigration and Customs Enforcement detentions through workplace raids, deputize local law enforcement to handle border security, increase U.S. Customs and Border Protection funding, as well as finish building the wall on the southern border. Trump has said he will deport both legal and illegal immigrants. The New York Times reported that Trump was considering "an extreme expansion of his first-term crackdown on immigration", such as "preparing to round up undocumented people already in the United States on a vast scale and detain them in sprawling camps while they wait to be expelled". Trump stated his intention to deport 11 million people through the construction of detention camps and deploy the military, relying on presidential wartime powers under the 18th-century Alien Enemies Act. Trump made false claims of a "migrant crime wave" that are not supported by data, and provided no evidence to back up his claims. In regards to his anti-immigrant nativism, Trump's tone grew harsher from his previous time as president, and used fearmongering, racial stereotypes, and more dehumanizing rhetoric when referring to illegal immigrants.
In February 2020, the United States government indicted members of China's People's Liberation Army for the 2017 Equifax data breach, which involved hacking into Equifax and plundering sensitive data as part of a massive heist that also included stealing trade secrets, though the CCP denied these claims.
Sources: en.wikipedia.org
Sulfoaildenafil (thioaildenafil) is a synthetic drug that is a structural analog of sildenafil (Viagra). It was first reported in 2005, and it is not approved by any health regulation agency. Like sildenafil, sulfoaildenafil is a phosphodiesterase type 5 inhibitor. Sulfoaildenafil has been found as an adulterant in a variety of supplements which are sold as "natural" or "herbal" sexual enhancement products. A range of designer analogues of USA FDA-approved inhibitors of type-5 cGMP-specific phosphodiesterase (PDE5), such as sildenafil and vardenafil, have been detected in recent years as adulterants in over-the-counter herbal aphrodisiac products and dietary supplements, in an apparent attempt to circumvent both the legal restrictions on sale of erectile dysfunction drugs, which are prescription-only medicines in most Western countries, and the patent protection which prevents sale of these drugs by competitors except under license to their inventors. These compounds have been demonstrated to display PDE5 inhibitory activity in vitro and presumably have similar effects when consumed, but have undergone no formal testing in either humans or animals, and as such represent a significant health risk to consumers of these products due to their unknown safety profile. Some attempts have been made to ban these drugs as unlicensed medicines, but progress has been slow so far, as even in those jurisdictions which have laws targeting designer drugs, the laws are drafted to ban analogues of illegal drugs of abuse, rather than analogues of prescription medicines.
In these brooding species, the eggs are relatively large, supplied with yolk, and generally develop directly into miniature starfish without an intervening larval stage, called "lecithotrophic". In Parvulastra parvivipara, an intragonadal brooder, the young starfish obtain nutrients by eating other eggs and embryos in the brood pouch. Brooding occurs in species that live in colder waters, as well as in smaller species that produce just a few eggs. The timing of spawning may be influenced by lighting conditions, water temperature, food availability, and other factors. Individuals may gather together to release their gametes at once, using pheromones to attract each other. In some species, a male and female may come together and form a pair. They engage in pseudocopulation which involves the male crawling on the female; the male fertilises the gametes while the female releases them.
The council is the legislative branch of government. One councilor is elected to represent each of the 15 districts of the Cherokee Nation in the 14 county tribal jurisdictional area. Two tribal council members represent the at-large citizenry – those who live outside the tribe's 14-county jurisdictional area in northeastern Oklahoma. The 17 councilors total are elected to staggered four-year terms. The deputy chief serves as president of the council, and casts tie-breaking votes when necessary.
=== Expansion === In 1994, Dane and Travis Boersma struck a deal with a customer, Marty McKenna, which allowed him to open his own Dutch Bros in Medford, about 30 miles away from Grants Pass. McKenna's first stand performed so well that he soon opened up a second one across town. In 1997, the Boersmas brought McKenna on as a partner, hoping he would continue to expand the Medford operations. Two years later, they bought out McKenna's stake in the company. In 1999, Dutch Bros started formally franchising. The company opened its 50th franchised drive-thru location in 2004. That same year, shortly after moving into a new headquarters in Grants Pass, a nearby dumpster fire spread to the building, destroying Dutch Bros roasting equipment, five vehicles, and thousands of pounds of coffee beans. Following this incident, the company continued to expand, and by the end of 2004, operated 61 coffee shops spanning from Northern California to Oregon's Willamette Valley. By 2009, Dutch Bros was running about 135 coffee stands in seven states and generating $50 million in gross annual revenue. Dane Boersma died in 2009 from amyotrophic lateral sclerosis. In 2013, Travis Boersma was featured on the American version of the television show Undercover Boss. Revenues continued to grow into the mid-2010s. The company earned $238 million in systemwide sales in 2015, $350 million in 2016, and $415.3 million in 2017, when over 283 Dutch Bros locations were operating.
As systematic review of 16 studies by Cochrane on Antimicrobial mouthwashes (gargling) and nasal sprays concludes that "there is currently no evidence relating to the benefits and risks of patients with COVID‐19 using antimicrobial mouthwashes or nasal sprays."
Sources: en.wikipedia.org
Mass spectrometry provides the identity check, because the observed mass is compared with the theoretical mass of the AEDG sequence. Chromatography separates and quantifies impurities but does not by itself prove which peptide is present. The two techniques are normally used together.
Yes. Trifluoroacetate and acetate ions remain associated with the peptide after purification, so a weighed quantity of powder contains less peptide than the nominal mass suggests. Certificates that report net peptide content rather than raw weight are more directly comparable between suppliers.
Dilute aqueous solutions are less stable than the dry powder and are usually aliquoted and frozen to avoid repeated freeze–thaw cycles. Lyophilised material is best stored desiccated at −20 °C, protected from light. Working solutions are typically prepared fresh from a frozen aliquot.
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.