The short version of telomerase fits in a sentence. The long version — which is the one that helps — is below.
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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.
Epitalon is a synthetic linear tetrapeptide with the sequence alanine–glutamate–aspartate–glycine, abbreviated AEDG. Its molecular formula is C14H22N4O9 and the calculated mass is approximately 390.35 g/mol. The compound is made by solid-phase peptide synthesis rather than extracted from tissue, although early work described it as a short fragment of a peptide fraction obtained from bovine pineal extract. In the research literature the spelling epitalon and the variant epithalone both appear, while AEDG is the standard code used in peptide nomenclature.
Several names circulate for the same molecule, including epitalon, epithalone, epithalamin tetrapeptide, and the sequence code AEDG. A CAS registry number, 307297-39-8, is commonly cited for it, though catalogue entries should be checked against supplier documentation because mislabelled records occur. In its usual form the peptide carries free amino and carboxyl termini and is neither glycosylated nor lipidated. Researchers distinguish the defined tetrapeptide from epithalamin itself, a crude pineal preparation containing many peptides that is not chemically characterised.
Material supplied for laboratory use is normally a lyophilised white to off-white powder that dissolves readily in water and in isotonic saline. Lyophilised cakes are hygroscopic and should be equilibrated to room temperature before opening to limit condensation on the solid. Solutions are typically prepared at milligram-per-millilitre concentrations and divided into single-use aliquots, because repeated freeze–thaw cycles degrade short peptides. Aqueous solutions are far less stable than the dry powder, and identity is usually verified by mass spectrometry alongside purity estimation from reversed-phase high-performance liquid chromatography.
| Property | Value | Notes |
|---|---|---|
| Amino acid sequence | Ala-Glu-Asp-Gly | Tetrapeptide, often abbreviated AEDG |
| Molecular formula | C14H22N4O9 | Free peptide, unmodified termini |
| Molecular weight | ~390.35 Da | Calculated for the free acid form |
| Appearance | White to off-white powder | Typical lyophilized product form |
| Solubility class | Freely soluble in water | Two acidic residues dominate ionic character |
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.
Epitalon is a synthetic tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, abbreviated AEDG. Its molecular formula is C14H22N4O9 and its calculated monoisotopic mass is approximately 390.35 daltons. The compound does not occur naturally as a free peptide; it is produced by solid-phase peptide synthesis. Because it contains two acidic residues and no basic residues, the neutral form carries a net negative charge at physiological pH. This charge profile influences how the peptide behaves in solution and during chromatographic analysis.
Laboratory-grade epitalon is typically supplied as a lyophilized powder. Purity is commonly assessed with reverse-phase high-performance liquid chromatography, often paired with mass spectrometry to confirm molecular identity. Amino acid analysis and peptide mapping can provide additional confirmation of sequence. Certificates of analysis for research materials frequently report purity above 95 percent, although the methods behind such figures vary between suppliers. The absence of a pharmacopeial monograph means that no single standardized assay defines the compound, so reported results depend on the analytical protocol chosen.
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.
The parent extract epithalamin was characterised as a low-molecular-weight fraction of pineal tissue rather than a single defined chemical entity. Researchers fractionated it and tested successive fragments for activity, a screening approach typical of peptide discovery work in that era. Epitalon emerged from that process as one of the shorter sequences of interest. Because the original extract was never fully resolved into individual components, claims about which constituent drives a given effect rest on inference. This distinction matters when reading older reports that attribute extract observations to the tetrapeptide itself.
Epitalon is a synthetic tetrapeptide with the residue sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. Its monoisotopic mass is approximately 390.35 daltons, and it is usually supplied as a lyophilised trifluoroacetate or acetate salt. The compound was derived from a pineal gland extract called epithalamin, a heterogeneous preparation investigated in the former Soviet Union. Researchers associated with the Saint Petersburg Institute of Bioregulation and Gerontology described the tetrapeptide as a constituent fragment of that extract. Commercial material is offered as a laboratory reagent rather than as a finished pharmaceutical product.
Literature searches for this compound must account for several spelling variants. Indexing databases contain epitalon, epithalon, epithalone, and AEDG, and relevant records are scattered across Russian-language and English-language journals that do not consistently cross-cite. Early publications describe the parent extract as a mixture of many peptides, whereas later work addresses the single synthetic tetrapeptide. That shift in nomenclature complicates comparison between studies, because extract data and tetrapeptide data are sometimes cited interchangeably. A search strategy omitting the alternate spellings will return an incomplete set of references.
=== Booster preparations === The Atlas booster used for MA-9 sported several technical improvements, most notably an enhanced propulsion system with a hypergolic igniter that would eliminate the need for hold-down time at launch to prevent rough combustion. With seven successful Mercury launches in a row, the failures of the early days seemed like a distant memory by early 1963 and NASA officials had a high degree of confidence in the Atlas that overshadowed its still spotty launch record. At the first meeting of senior MSFC officials for the year (January 11), Walter Williams noted that the Air Force had yet to provide an explanation for two Atlas F failures during the second half of 1962. Until the investigation committees released their findings and cleared the Atlas D of guilt by association, Cooper's flight could be delayed. During the seven months between Schirra's and Cooper's flights, there were five failures of Atlas D vehicles (one of them an Atlas-Agena, the rest operational ICBM tests). NASA did not let its guard down on the Atlas, despite the recent high degree of success enjoyed by Project Mercury. When Atlas 130D received its factory rollout on January 30, it was found to have damaged wiring and had to be sent back for repairs. At his first press conference on February 8, Gordon Cooper admitted to not knowing much about the booster problems and focused instead on the enhancements made to his Mercury capsule.
Claus von Bülow (born Claus Cecil Borberg; 11 August 1926 – 25 May 2019) was a British lawyer, consultant and socialite. In 1982, he was convicted of attempting to murder his wife Sunny von Bülow (born Martha Sharp Crawford; 1932–2008) in 1979, which had left her in a temporary coma, and in 1980, when an alleged insulin overdose left her in a persistent vegetative state for the rest of her life. On appeal, both convictions were reversed, and von Bülow was found not guilty at his second trial.
"RCSB Protein Data Bank - Structure Summary for 1Z7C - Crystal Structure of Human Placental Lactogen". "Human Chorionic Somatomammotropin Enhancer Function Is Mediated by Cooperative Binding of TEF-1 and CSEF-1 to Multiple, Low-Affinity Binding Sites". Archived from the original on 2008-07-05.
Sources: en.wikipedia.org
The Soviet Union placed great emphasis on science and technology. Lenin believed the USSR would never overtake the developed world if it remained as technologically backward as it was upon its founding. Soviet authorities proved their commitment to Lenin's belief by developing massive networks and research and development organizations. In the early 1960s, 40% of chemistry PhDs in the Soviet Union were attained by women, compared with only 5% in the United States. By 1989, Soviet scientists were among the world's best-trained specialists in several areas, such as energy physics, selected areas of medicine, mathematics, welding, space technology, and military technologies. However, due to rigid state planning and bureaucracy, the Soviets remained far behind the First World in chemistry, biology, and computer science. Under Stalin, the Soviet government persecuted geneticists in favour of Lysenkoism, a pseudoscience rejected by the scientific community in the Soviet Union and abroad but supported by Stalin's inner circles. Implemented in the USSR and China, it resulted in reduced crop yields and is widely believed to have contributed to the Great Chinese Famine. In the 1980s, the Soviet Union had more scientists and engineers relative to the world's population than any other major country, owing to strong levels of state support. Some of its most remarkable technological achievements, such as launching the world's first space satellite, were achieved through military research.
== University == Govt. Medical College Patiala is affiliated to Baba Farid University of Health Sciences Faridkot, Established in the memory of great Sufi Saint Baba Farid by Punjab government in July, 1900 by an Act of the State Legislature, which was established in 1999.
=== Early history === 1935 – Midwest Consultants was founded in St Louis by brothers Aaron Fischer and Bernard Fischlowitz, who hired chemical engineer Daniel Broida. 1946 – Sigma was formed from Midwest Consultants and manufactured just adenosine triphosphate. They were the first to manufacture pure ATP. 1972 – Sigma's IPO 1951 – Aldrich founded in Milwaukee by Alfred Bader and Jack Eisendrath and manufactured just 1-methyl-3-nitro-1-nitrosoguanidine. 1966 – Aldrich's IPO 1972 – Subsidiary Aldrich-Boranes launched to manufacture hydroboration products 1975 – Merger of Sigma Chemical and Aldrich Chemical to created Sigma-Aldrich. Their first year earned $43 million in sales. 1999 – Sigma-Aldrich reaches $1 billion in sales 2005 – Announced membership in The RNAi Consortium 2014 – Merck KGaA announced that it would purchase Sigma-Aldrich for approx. $17 billion (€13.1 billion). November 3, 2014 – Sigma-Aldrich filed a definitive proxy statement with the U.S. Securities and Exchange Commission to hold a special investors meeting regarding approval for the sale to Merck KGaA.
Sources: en.wikipedia.org
== Autologous grafts == Autologous grafts are used to transfer tissue from one site to another on the same body. The use of autologous grafts prevents transplantation rejection reactions. Grafts used for oral reconstruction are preferably taken from the oral cavity itself (such as gingival and palatal grafts). However, their limited availability and small size leads to the use of either skin transplants or intestinal mucosa to be able to cover bigger defects. Other than tissue shortage, donor site morbidity is a common problem that may occur when using autologous grafts. When tissue is obtained from somewhere other than the oral cavity (such as the intestine or skin) there is a risk of the graft not being able to lose its original donor tissue characteristics. For example, skin grafts are often taken from the radial forearm or lateral upper arm when covering more extensive defects. A positive aspect of using skin grafts is the large availability of skin. However, skin grafts differ from oral mucosa in: consistency, color and keratinization pattern. The transplanted skin graft often continues to grow hair in the oral cavity.
Best opium 1/2 dr., dissolve it in about 2 tbsp [30 mL] of boiling water; then add benzoic acid 1/2 dr.; oil of anise 1/2 a fluid dr.; clarified honey 1 oz.; camphor gum 1 scruple; alcohol, 76 percent, 11 fluid ozs.; distilled water 4-1/2 fluid ozs.; macerate, (keep warm,) for two weeks. Dose – For children, 5 to 20 drops, adults, 1 to 2 tea-spoons. A dram (dr.) is about 1.8 grams, a modern teaspoon is 5 mL, and a scruple is 1⁄4 teaspoon.
== Mechanism of action == According to PharmaMar, lurbinectedin inhibits the active transcription of the encoding genes. This has two consequences. It promotes tumor cell death and normalizes the tumor microenvironment. Active transcription is the process by which there are specific signal where information contained in the DNA sequence is transferred to an RNA molecule. This activity depends on the activity of an enzyme called RNA polymerase II. Lurbinectedin inhibits transcription through a very precise mechanism. Firstly, lurbinectedin binds to specific DNA sequences. It is at these precise spots that RNA polymerase II slides down the DNA to produce RNA that is blocked and degraded by lurbinectedin. Lurbinectedin also has important role in tumor microenvironment. The tumor cells act upon macrophages to avoid them from behaving like an activator of the immune system. Macrophages can contribute to tumor growth and progression by promoting tumor cell proliferation and invasion, fostering tumor angiogenesis and suppressing antitumor immune cells.
Sources: en.wikipedia.org
Epitalon is a synthetic tetrapeptide composed of four amino acids: alanine, glutamate, aspartate, and glycine. It is written as Ala-Glu-Asp-Gly. The free peptide has a molecular weight of about 390 daltons and is normally supplied as a lyophilized powder.
No. Epitalon is chemically synthesized, not extracted. It was designed as a short synthetic fragment conceptually related to larger pineal peptides studied in the same research tradition, particularly the extract known as epithalamin. The two are distinct materials with different compositions.
The term bioregulator is used in this research tradition for short peptides proposed to influence gene expression or cell function. Epitalon is grouped with other synthetic short peptides under this label. The term reflects a proposed mechanism rather than an established drug classification.
It is a synthetic tetrapeptide. Its sequence was derived from research on peptide fractions of bovine pineal extract, and the intact AEDG sequence has not been demonstrated as an abundant free peptide in human tissue.