The short version of AEDG fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2025-12-21. Anything still debated is marked as such rather than presented as settled.
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.
Storage recommendations center on limiting moisture, heat, and light. The dry powder is generally kept at minus 20 degrees Celsius, and some suppliers recommend minus 80 degrees for long-term archival. Once dissolved, solutions are usually aliquoted and frozen to avoid repeated freeze-thaw cycles, which can promote aggregation or degradation. Aqueous stability depends on pH and concentration, and buffered saline is often preferred over plain water for biological work. Stability data specific to epitalon remain limited, so general peptide-handling practices are applied by analogy rather than from product-specific validation.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Derived from the four constituent residues |
| Molecular mass | About 390.35 Da | Monoisotopic value, confirmed by mass spectrometry |
| Residue sequence | Ala-Glu-Asp-Gly | Read from the N-terminus to the C-terminus |
| Common synonyms | Epithalon; AEDG | Both forms appear in reference catalogues |
| Net charge near neutral pH | Negative | Two acidic side chains give a low isoelectric point |
Proposed mechanisms centre on cell-culture observations rather than a defined receptor interaction. Several reports describe increased expression of the telomerase catalytic subunit after exposure of cultured human cells, and the authors attributed the effect to short peptide fragments entering the nucleus and influencing gene transcription. No receptor for the tetrapeptide has been identified, and the free peptide is expected to be degraded rapidly by plasma peptidases. Whether any measurable fraction reaches intact tissues after administration remains an unresolved question rather than an established finding.
The published literature is dominated by a small number of research groups, much of it in Russian-language journals, and independent replication outside those groups is limited. Studies are typically small, use cultured cells or rodent models, and report endpoints that differ between papers, which makes comparison difficult. Large randomised human trials have not appeared in the indexed literature. Questions about absorption, distribution and clearance are therefore still treated as open in reviews that mention the compound.
Epitalon is a synthetic tetrapeptide with the sequence alanine–glutamate–aspartate–glycine, commonly abbreviated AEDG. Its design traces to epithalamin, a peptide fraction prepared from bovine pineal gland extracts that researchers in Saint Petersburg began investigating in the 1970s. The compound has a molecular formula of C14H22N4O9 and a nominal molecular mass near 390 daltons. It holds no approved drug status in the United States or the European Union, and material sold under this name is generally offered as a research chemical rather than a finished pharmaceutical product.
Prevent or treat dehydration Prevent or treat low blood sugar Prevent or treat low body temperature Prevent or treat infection; Correct electrolyte imbalances Correct micronutrient deficiencies Start feeding cautiously Achieve catch-up growth Provide psychological support Prepare for discharge and follow-up after recovery
The company expanded through the 1950s, both selling equipment built by other companies and developing custom-made devices. Bakken built a small pacemaker that could be strapped to the body and powered by batteries. Work in the new field later produced an implantable pacemaker in 1960. The company built its headquarters in the Minneapolis suburb of St. Anthony, Minnesota, in 1960, and moved to Fridley in the 1970s. Medtronic's main competitors in the cardiac rhythm field include Boston Scientific and St. Jude Medical.
=== Surgery === In severe cases, an endoscopic thoracic sympathectomy procedure can be performed. Here, the nerves that signal the blood vessels of the fingertips to constrict are surgically cut. Microvascular surgery of the affected areas is another possible therapy, but this procedure should be a last resort. A more recent treatment for severe Raynaud's is botulinum toxin. In a 2009 study of 19 patients ranging in age from 15 to 72 years with severe Raynaud's phenomenon, 16 patients (84%) reported pain reduction at rest, 13 patients reported immediate pain relief, and three had gradual pain reduction over 1–2 months. All 13 patients with chronic finger ulcers healed within 60 days. Only 21% of the patients required repeated injections. A 2007 article describes similar improvement in a series of 11 patients. All patients had significant relief of pain.
Sodium-based action potentials usually last for under one millisecond, but calcium-based action potentials may last for 100 milliseconds or longer. In some types of neurons, slow calcium spikes provide the driving force for a long burst of rapidly emitted sodium spikes. In cardiac muscle cells, on the other hand, an initial fast sodium spike provides a "primer" to provoke the rapid onset of a calcium spike, which then produces muscle contraction.
This effect explains the extremely rapid onset of local bleeding seen in victims of Agkistrodon acutus bites. AaH I also indirectly enhances hemorrhage by interfering with platelet aggregation, because ECM fragments generated by proteolysis prevent platelets from binding properly to the injury site. This prolongs bleeding and contributes to systemic effects such as hypotension and organ ischemia. When the toxin reaches the kidneys, its proteolytic activity contributes to mesangiolysis, where the supporting mesangial cells of the glomerulus detach and die, ultimately leading to renal failure.
Sources: en.wikipedia.org
== History == The first flame ionization detectors were developed simultaneously and independently in 1957 by McWilliam and Dewar at Imperial Chemical Industries of Australia and New Zealand (ICIANZ, see Orica history) Central Research Laboratory, Ascot Vale, Melbourne, Australia and by Harley and Pretorius at the University of Pretoria in Pretoria, South Africa. In 1959, Perkin Elmer Corp. included a flame ionization detector in its Vapor Fractometer.
It was most popular in the 17th century, but was discontinued in the early 19th century when its composition became generally known to artists who replaced the said pigment by a totally different blend -but keeping the original name, mummia or mummy brown-yielding a similar tint and based on ground minerals (oxides and fired earths) and or blends of powdered gums and oleoresins (such as myrrh and frankincense) as well as ground bitumen. These blends appeared on the market as forgeries of powdered mummy pigment but were ultimately considered as acceptable replacements, once antique mummies were no longer permitted to be destroyed. In 1890, about 180,000 mummified cats were excavated and shipped from Egypt to England to be processed for use in fertilizer.
Donohue syndrome is an autosomal recessive genetic disorder. The mutations responsible for the disorder are found on the short arm chromosome 19 (19p13.2) within the coding sequence of the INSR gene (insulin receptor) causing the production of inactive receptor molecules. There are several mutations that can be responsible for the disease, as any mutation that severely impairs the functionality of the insulin receptor will have similar effects. The INSR gene spans over one hundred and twenty thousand base pairs, which contain twenty-two exons coding for a protein that consists of 1382 amino acids. Some of the introns may or may not be spliced out depending on the kind of cell. Known mutations to the gene which can cause Donohue syndrome include a nonsense mutation that resulted in early termination of the protein, an addition or deletion mutation that resulted in a frame shift, a single missense mutation and in the milder form mentioned above, a single codon change that altered isoleucine to methionine in the receptor protein. Some mutations to the gene instead result in insulin resistant diabetes without Donohue syndrome. Because mutations in the gene are extremely rare, most cases result from consanguineous matings, for example, between cousins. However, the exact mutation need not be the same. Disease can be caused by inheritance of two different mutant alleles, one from each parent, in which case the patient is a compound heterozygote. A heterozygous individual (i.e.
Ethel and Howard Florey published the results of clinical trials of penicillin in The Lancet on 27 March 1943, reporting the treatment of 187 cases of sepsis with penicillin. It was upon this medical evidence that the British War Cabinet set up the Penicillin Committee on 5 April 1943. The committee consisted of Cecil Weir, Director General of Equipment, as chairman; Alexander Fleming; Howard Florey; V. D. Allison, another one of Fleming's former research students; Sir Percival Hartley, the head of the MRC; and representatives from pharmaceutical companies. This led to the mass production of penicillin by the next year.
Sources: en.wikipedia.org
Other widely used zinc alloys include nickel silver, typewriter metal, soft and aluminium solder, and commercial bronze. Zinc is also used in contemporary pipe organs as a substitute for the traditional lead/tin alloy in pipes. Alloys of 85–88% zinc, 4–10% copper, and 2–8% aluminium find limited use in certain types of machine bearings. Zinc has been the primary metal in American one cent coins (pennies) since 1982. The zinc core is coated with a thin layer of copper to give the appearance of a copper coin. In 1994, 33,200 tonnes (36,600 short tons) of zinc were used to produce 13.6 billion pennies in the United States. Alloys of zinc with small amounts of copper, aluminium, and magnesium are useful in die casting as well as spin casting, especially in the automotive, electrical, and hardware industries. These alloys are marketed under the name Zamak. An example of this is zinc aluminium. The low melting point together with the low viscosity of the alloy makes possible the production of small and intricate shapes. The low working temperature leads to rapid cooling of the cast products and fast production for assembly. Another alloy, marketed under the brand name Prestal, contains 78% zinc and 22% aluminium, and is reported to be nearly as strong as steel but as malleable as plastic. This superplasticity of the alloy allows it to be molded using die casts made of ceramics and cement. Similar alloys with the addition of a small amount of lead can be cold-rolled into sheets.
A mesenchymal–epithelial transition (MET) is a reversible biological process that involves the transition from motile, multipolar or spindle-shaped mesenchymal cells to planar arrays of polarized cells called epithelia. MET is the reverse process of epithelial–mesenchymal transition (EMT) and it has been shown to occur in normal development, induced pluripotent stem cell reprogramming, cancer metastasis and wound healing.
At Australia's federation in 1901, the Constitution section 51(xxxv) empowered the making of "laws for the peace, order, and good government of the Commonwealth with respect to... conciliation and arbitration for the prevention and settlement of industrial disputes extending beyond the limits of any one state". This was used to pass the Commonwealth Conciliation and Arbitration Act 1904 where a "dispute" would trigger federal jurisdiction between trade unions and employers, and this was meant to make strikes illegal or unnecessary, although in fact strikes remained "not uncommon". The Commonwealth Court of Conciliation and Arbitration (CCCA) could hear disputes, and make "awards" for fair wages and conditions across an industry if there was no agreement reached, or regulate any "industrial matters". With favourable governments in power, some courts were progressive, and in the landmark Harvester case the CCCA determined that the employer, Hugh Victor McKay that made harvesting machinery, was required to pay "fair and reasonable wages", or pay an excise tax on exports, under the Excise Tariff Act 1906. What was "fair and reasonable", said Higgins J depended on "the normal needs of an average employee, regarded as a human being in a civilised community", and this was to be found by imagining a hypothetical collective agreement, not individual bargaining with the "usual, but unequal, contest, the "higgling of the market" for labour, with the pressure for bread on one side and the pressure for profits on the other".
Sources: en.wikipedia.org
It is a four-amino-acid peptide built from alanine, glutamate, aspartate and glycine in that order. Its formula is C14H22N4O9, and it is made by chemical synthesis rather than extracted from tissue. The synthetic peptide is a single defined molecule, unlike the pineal extracts it is often compared with.
No. The two spellings refer to the same tetrapeptide, and the difference reflects transliteration from Russian. Laboratories and catalogues use both forms interchangeably. The material is also indexed as AEDG, taken from the one-letter codes of its residues.
Epithalamin is a mixed preparation derived from animal pineal tissue and contains many peptides. Epitalon is one synthetic sequence chosen for study from that broader mixture. Statements about one do not transfer directly to the other.
Epitalon is a synthetic tetrapeptide built from four amino acids: alanine, glutamate, aspartate, and glycine. It is not extracted from a natural source but made in the laboratory by chemical synthesis. Its short length makes it relatively straightforward to produce at high purity.