The short version of bioregulator fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-05-16 and is reviewed periodically as new material appears.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Linear tetrapeptide | Four residues joined by three peptide bonds |
| Sequence | Ala-Glu-Asp-Gly | Commonly abbreviated AEDG |
| Molecular formula | C14H22N4O9 | Free acid form |
| Monoisotopic mass | Approximately 390 Da | Matches values reported from mass spectrometry |
| Net charge near neutral pH | Negative | Contributed by glutamate and aspartate side chains |
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.
Epitalon is a synthetic tetrapeptide with the amino acid sequence alanine-glutamate-aspartate-glycine, abbreviated Ala-Glu-Asp-Gly or AEDG. It was developed by the Russian researcher Vladimir Khavinson and colleagues during work on peptide bioregulators derived from the pineal gland. The compound is short enough to be produced by standard solid-phase peptide synthesis and is typically handled as a lyophilized white powder. Its small size distinguishes it from larger pineal peptides such as epithalamin, a complex extract from which the tetrapeptide was conceptually derived.
The four residues give epitalon a molecular formula of C14H22N4O9 and a molecular weight near 390.35 daltons. The presence of two acidic residues, glutamate and aspartate, makes the free peptide strongly acidic, while the alanine and glycine ends provide neutral, nonpolar character. This combination produces a molecule with substantial water solubility. Because there are no cysteine, methionine, or tryptophan residues, the peptide lacks the most common oxidation-sensitive side chains, which simplifies handling compared with many longer peptides.
=== Editors === Francis Pharcellus Church (1859), editorial writer for the New York Sun and author of Yes, Virginia, There is a Santa Claus Horatio Sheafe Krans (1894), author and editor Simeon Strunsky (1900), literary editor of the New York Evening Post and editorial writer for The New York Times Lester Markel (1914), edited "Review of the Week", a section of The New York Times, which won the Special Awards and Citations Pulitzer Prize in 1953 Daniel Longwell (1922), co-founder and managing editor of Life Theodore M. Bernstein (1924), assistant managing editor of The New York Times Herbert Solow (1924), editor of Fortune Groff Conklin (1927), science fiction anthologist Emanuel Freedman (1931), foreign editor of The New York Times James Wechsler (1935), editorial page editor of the New York Post David Perlman (1939), former science editor of the San Francisco Chronicle Lester Bernstein (1940), former editor-in-chief of Newsweek Werner Wiskari (1941), international news editor of The New York Times Lucien Carr (1946), editor for United Press International Byron Dobell (1947), editor of American Heritage, Esquire; mentor to journalists Tom Wolfe, David Halberstam, and Mario Puzo Charles Peters (1949), founder and former editor-in-chief of The Washington Monthly Ashbel Green (1950), senior editor and vice president of Alfred A. Knopf Emile Capouya (1951), literary editor of The Nation 1969–1981 Robert Gottlieb (1952), editor of The New Yorker and president of Alfred A.
=== Illinois === Phlebotomists are not licensed in Illinois but must have a high school diploma and have completed a training program to practice. Certification is not required and phlebotomists do not fall under the Illinois Clinical Laboratory Act. In 2020, Illinois passed a bill requiring the Illinois Department of Public Health to triannually develop training materials for drawing blood from children and adults with intellectual and developmental disabilities and for facilities to ensure the training is incorporated for phlebotomists. There have been bills to introduce phlebotomy licensure in Illinois, but have been unsuccessful.
Functional or homology screening strategies have been used to identify genes that produce small bioactive molecules. Functional metagenomic studies are designed to search for specific phenotypes that are associated with molecules with specific characteristics. Homology metagenomic studies, on the other hand, are designed to examine genes to identify conserved sequences that are previously associated with the expression of biologically active molecules. Functional metagenomic studies enable the discovery of novel genes that encode biologically active molecules. These assays include top agar overlay assays where antibiotics generate zones of growth inhibition against test microbes, and pH assays that can screen for pH change due to newly synthesized molecules using pH indicator on an agar plate. Substrate-induced gene expression screening (SIGEX), a method to screen for the expression of genes that are induced by chemical compounds, has also been used to search for genes with specific functions. Homology-based metagenomic studies have led to a fast discovery of genes that have homologous sequences as the previously known genes that are responsible for the biosynthesis of biologically active molecules. As soon as the genes are sequenced, scientists can compare thousands of bacterial genomes simultaneously. The advantage over functional metagenomic assays is that homology metagenomic studies do not require a host organism system to express the metagenomes, thus this method can potentially save the time spent on analyzing nonfunctional genomes.
Sources: en.wikipedia.org
==== Hot fusion ==== The table below provides cross-sections and excitation energies for hot fusion reactions producing nobelium isotopes directly. Data in bold represents maxima derived from excitation function measurements. + represents an observed exit channel.
== Reproduction and development == Eggs are laid in an ootheca which the female carries out the end of her abdomen for varying lengths of time. When ready she either deposits it on the ground, or attaches it to an object. The hardened ootheca helps protect the developing eggs. Optimal temperature range and patterns effect the hatch rate. Research has found that the best hatch rates occur when temperature alternates between 5°C and 30°C (the ootheca were left at the lower temperature for seven days, then left at the higher temperature for the remainder of development), the development time averages 44 days. Less effective temperature combinations may result in longer development times, alternating 10°C and 25°C, averages 61 days. E. sinensis is considered to have a flexible life cycle, as length can vary from 1 to 3 years, depending on latitude the population is from. Females can survive up to 30 months, while males lifespan is much shorter. The variable lifespans correlates to varying number of instars, 7 to 9, or 9 to 11. Males generally develop faster than females. The species takes longer to develop at lower temperatures.
According to one of Liu's generals, education would make it so that “within ten to twenty years, the people will have forgotten even the names of the minority groups.” He established several schools for Tibetans in the borderlands in order to facilitate "Han-Tibetan language exchange". The language of instruction within schools was a matter of much debate within the provincial government, but by 1942, Liu's administration began prioritizing bilingual education in order to encourage Tibetans to learn Chinese. This came along with a slate of other measures aimed at creating a mobile educational system using geshe or khenpo monks to disseminate nationalist values to isolated and nomadic borderland communities. Liu recognized that the monks and lamas held more power in many areas of Xikang than the government; thus, the government would have to co-opt them. As part of this effort, anti-Japanese war propaganda and bilingual newspapers were posted on the walls of temples. Liu Wenhui criticized the Sinicization policies of past Xikang ruler Zhao Erfeng for being "extremist", saying that Zhao "emphasized force and acted too hastily"; however, this must be placed in light of his own contradictory stances.
Sources: en.wikipedia.org
On November 27, The Washington Post published an article alleging that Secretary of Defense Pete Hegseth had ordered the officers responsible for the first airstrike on September 2, 2025, to "kill everyone" on board, prompting Admiral Frank M. Bradley to order a second strike to kill the two survivors of the initial strike, who were clinging to the wreckage of the boat that had been by the initial strike. As no quarter orders are forbidden under the Law of war, the second September 2 strike was widely criticized as constituting a war crime even under the Trump Administration's justification for the boat strike campaign in general, with the chair of the United States Senate Committee on Armed Services, Republican Senator Roger Wicker, along with ranking member Jack Reed, promising "vigorous oversight to determine the facts related to these circumstances". According to The New York Times, five U.S. officials stated that while Hegseth did, on September 2, order the killing of all individuals aboard the alleged drug boat, he did not specifically address what was to be done if any individuals survived the initial strike and was not present when Bradley carried out the second strike. After Hegseth refused to release a video of the second strike to Congress, the United States Senate placed a provision in the 2026 National Defense Authorization Act holding back a quarter of Hegseth's travel budget until he showed the video to lawmakers.
Spiral orb webs, associated primarily with the family Araneidae, as well as Tetragnathidae and Uloboridae Tangle webs or cobwebs, associated with the family Theridiidae Funnel webs, with associations divided into primitive and modern Tubular webs, which run up the bases of trees or along the ground Sheet webs Several different types of silk may be used in web construction, including a "sticky" capture silk and "fluffy" capture silk, depending on the type of spider. Webs may be in a vertical plane (most orb webs), a horizontal plane (sheet webs), or at any angle in between. It is hypothesized that these types of aerial webs co-evolved with the evolution of winged insects. As insects are spiders' main prey, it is likely that they would impose strong selectional forces on the foraging behavior of spiders. Most commonly found in the sheet-web spider families, some webs will have loose, irregular tangles of silk above them. These tangled obstacle courses serve to disorient and knock down flying insects, making them more vulnerable to being trapped on the web below. They may also help to protect the spider from predators such as birds and wasps. It is reported that several Nephila pilipes individuals can collectively construct an aggregated web system to counter bird predation from all directions.
The four substrates of this enzyme are 4-hydroxybenzoic acid, reduced nicotinamide adenine dinucleotide (NADH), oxygen, and a proton. Its products are hydroquinone, oxidised NAD+, water, and carbon dioxide. Nicotinamide adenine dinucleotide phosphate can be used as an alternative cofactor. This enzyme is a flavin-containing monooxygenase that uses molecular oxygen as oxidant and incorporates one of its atoms into the starting material. The systematic name of this enzyme class is 4-hydroxybenzoate,NAD(P)H:oxygen oxidoreductase (1-hydroxylating, decarboxylating). This enzyme is also called 4-hydroxybenzoate 1-monooxygenase. This enzyme participates in benzoic acid degradation.
Sources: en.wikipedia.org
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.
The compound came out of work on epithalamin, a peptide preparation derived from pineal tissue, conducted largely in Russian laboratories. Later studies in other countries examined it mainly in cell cultures and animal models.
The tetrapeptide sequence is a synthetic construct rather than a described circulating peptide. It was derived by analogy to peptide fractions obtained from tissue extracts, not isolated from blood or tissue as such.
Epitalon is a synthetic four-amino-acid peptide with the sequence alanine–glutamate–aspartate–glycine, also written AEDG. It was developed in Russian gerontology research and is studied for proposed effects on telomerase, melatonin regulation, and neuroendocrine function. It is not an approved pharmaceutical in the United States or the European Union.