AEDG comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2025-12-31. Numbers and descriptions here follow the published literature rather than marketing material.
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 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.
| 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 |
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.
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.
=== Caged and cage-free eggs === On November 5, 2015, Panera pledged that it would use only cage-free eggs in all of its stores by 2020. Panera also announced the addition of more plant-based proteins, such as edamame and organic quinoa, to its menu. At the time of the announcement, the company said it was 21% cage-free in the roughly 70 million eggs it used in 2015. In December 2016, it published its third animal welfare progress report, announcing new efforts to improve broiler chicken welfare. In 2021, Panera announced that it had transitioned to cage-free eggs for 65% of its egg supply but not yet the remaining 35%.
=== Funding trajectory === Since 1999, the division's funding increased more than six-fold. By 2012, OAM and NCCAM spent a cumulative $1.6 billion in grant funding. Between 1999 and 2009, NCCAM supported approximately 50% of the National Cancer Institute spending on CAM, with the total amount spent on CAM during that time frame $2.856 billion. The NCCIH budget for 2005 was $123 million. For fiscal year 2009 (ending September 30, 2009), it was $122 million. The NIH has also conducted research in alternative medicine at the National Cancer Institute by the Office of Cancer Complementary and Alternative Medicine which, in 2009, had the same $122 million budget as NCCIH. For FY 2009; NIH's total budget was about $29 billion. The NCCIH budget for 2015 was $124.1 million. They requested a $3,459,000 funding increase for their 2016 budget. By FY2023, the NCCIH budget had grown to approximately $170 million annually. The FY2026 President's Budget proposed eliminating NCCIH entirely, but Congress rejected the proposal and maintained NCCIH funding at the FY2025 level.
The carbon atom next to the carboxyl group is called the α–carbon. In proteinogenic amino acids, it bears the amine and the R group or side chain specific to each amino acid, as well as a hydrogen atom. With the exception of glycine, for which the side chain is also a hydrogen atom, the α–carbon is stereogenic. All chiral proteinogenic amino acids have the L configuration, and can therefore be referred to as L-amino acids. They are "left-handed" enantiomers, which refers to the stereoisomers of the alpha carbon. A few D-amino acids ("right-handed") have been found in nature, e.g., in bacterial envelopes, as a neuromodulator (D-serine), and in some antibiotics. Rarely, D-amino acid residues are found in proteins, and are converted from the L-amino acid as a post-translational modification.
Naturally occurring ruthenium (44Ru) is composed of seven stable isotopes: 96, 98-102, 104 (of which the first and last may in the future be found radioactive). Additionally, 27 synthetic radioactive isotopes have been discovered. Of these radioisotopes, the most stable are 106Ru with a half-life of 371.8 days or 1.018 years, 103Ru, with a half-life of 39.245 days, and 97Ru with a half-life of 2.837 days. The other known isotopes run from 87Ru to 120Ru, and most of these have half-lives that are less than five minutes, except 94Ru (51.8 minutes), 95Ru (1.607 hours), and 105Ru (4.44 hours). The primary decay mode before the most abundant isotope, 102Ru, is electron capture to isotopes of technetium, and after beta emission to isotopes of rhodium. Double beta decay is the allowed mode for the two observationally stable isotopes: 96Ru and 104Ru. Because of the volatility of ruthenium tetroxide (RuO4), ruthenium isotopes with relatively short half-life are considered the next most hazardous airborne isotopes, after iodine-131, in case of release by a nuclear accident. The two most important isotopes of ruthenium so released are those with the longest half-life: 103Ru 106Ru.
A US- and UK-backed coup d'état in 1953 deposed the democratically-elected Iranian prime minister Mohammad Mosaddegh due to his nationalization of the oil industry, strengthening the rule of Shah Mohammad Reza Pahlavi. Israel maintained ties with Iran as part of its alliance of the periphery strategy. Resentment of the Shah's autocratic rule led to the 1979 revolution in which Pahlavi was overthrown and replaced by an Islamic republic. Iran severed diplomatic ties with the US and Israel and held the American embassy staff hostage, releasing them after signing the Algiers Accords (1981), in which, among other things, the US agreed not to intervene in Iranian affairs anymore. During the Iran–Iraq War, the US supported Iraq. In 1988, a US warship struck an Iranian mine, and the US responded by attacking Iran's navy. A few months later, the US mistakenly shot down a civilian Iranian flight. Iran started a ballistic missile program to deter Iraqi missile attacks on Iranian cities during the 1980–88 Iran–Iraq War and to compensate for its lack of a modern air force due to sanctions. Starting in 1985, Iran began engaging in proxy conflicts throughout the Middle East. These proxy groups became part of the informal 'Axis of Resistance' committed primarily to countering American, Israeli, Saudi, Emirati, and sometimes Turkish influence in the region. In 2002, Iran's covert nuclear program was first revealed, and Iran denied seeking a weapon. In 2003, Iran's AMAD Project was suspended following Supreme Leader Ali Khamenei's fatwa against nuclear weapons.
Sources: en.wikipedia.org
It is home to the headquarters of three Fortune Global 500 companies, the highest in the region. The nation's best known global companies include Singapore Airlines, Changi Airport, and the Port of Singapore, all of which are among the most-awarded in their respective fields. Singapore Airlines was ranked as Asia's most-admired company, and the world's 19th most-admired company in 2015 by Fortune's annual "50 most admired companies in the world" industry surveys. Other awards it has received include the US-based Travel + Leisure's Best International Airline award, which it has won for 20 consecutive years. Changi Airport connects over 100 airlines to more than 300 cities. The strategic international air hub has more than 480 World's Best Airport awards as of 2015, and is known as the most-awarded airport in the world. Over ten free-trade agreements have been signed with other countries and regions. Singapore is the second-largest foreign investor in India. It is the 14th largest exporter and the 15th largest importer in the world.
Dale Stevens of The Cincinnati Post called it "a respectable film, beautifully photographed, especially in the many action scenes", which "offers two lessons: (1) a decent movie can be made about bikers (2) Brian Bosworth, a controversial football player, can become an actor in the Schwarzenegger mold." Similarly, Joe Leydon of the The Houston Post commended Bosworth and deemed that "Stone Cold is a rude and undeniably exciting exploitation flick, a dum-dum bullet of a movie that races from one explosion of high-testosterone ultraviolence to the next, often leaving the audience slack-jawed through the sheer audacity of its excess."
The problem of the diesels causing a vacuum in the submarine when the head valve is submerged still exists in later model diesel submarines but is mitigated by high-vacuum cut-off sensors that shut down the engines when the vacuum in the ship reaches a pre-set point. Modern snorkel induction masts have a fail-safe design using compressed air, controlled by a simple electrical circuit, to hold the "head valve" open against the pull of a powerful spring. Seawater washing over the mast shorts out exposed electrodes on top, breaking the control, and shutting the "head valve" while it is submerged. US submarines did not adopt the use of snorkels until after WWII.
Before the advent of nuclear reactors, protactinium was separated for scientific experiments from uranium ores. Since reactors have become more common, it is mostly produced as an intermediate product of neutron capture on thorium, used for the production of the fissile 233U:
Sources: en.wikipedia.org
Pyridoxal phosphate (PLP, pyridoxal 5'-phosphate, P5P, scientitifically known as 4-formyl-5-hydroxy-6-methylpyridin-3-yl)methyl dihydrogen phosphate, the active form of vitamin B6, is a coenzyme in a variety of enzymatic reactions. The International Union of Biochemistry and Molecular Biology has catalogued more than 140 PLP-dependent activities, corresponding to ~4% of all classified activities. The versatility of PLP arises from its ability to covalently bind the substrate, and then to act as an electrophilic catalyst, thereby stabilizing different types of carbanionic reaction intermediates.
Obstacles in the form of destructive interference cause the particle to lose its wave properties for an instant before it regains them once again after it is freed from its locked position through a classic "hop". The movement of the electron towards the photo center is therefore covered in a series of conventional hops and quantum walks.
=== Post-Reynolds era and the "Slugging Seventies" (1961–1980) === John Coleman started his coaching career at Essendon in 1961, thus ending the Dick Reynolds era at the club. In the same year, Essendon finished the season mid-table, and supporters were not expecting too much for the following season. However, the club blitzed the opposition in 1962, losing only two matches and finishing top of the table. Both losses were to the previous year's grand finalists. The finals posed no problems for the resurgent Dons, easily accounting for Carlton in the season's climax, winning the 1962 Premiership by 32 points. This was a remarkable result for Coleman, who, in just his second season of coaching, claimed the ultimate prize in Australian football. As so often is the case after a flag, the following two years were below standard. A further premiership in 1965 (won from 4th position on the ladder) was also unexpected due to periods of poor form during the 1965 season. The Bombers were a different club when the finals came around, but some of the credit for the improvement was given to the influence of Brian Sampson and Ted Fordham during the finals. Coleman's time as coach turned out to be much like his playing career: highly successful but cut short when he had to stand down due to health problems in 1967. Only six years later, on the eve of the 1973 season, he died of a heart attack at just 44 years of age. Following Coleman's retirement, the club experienced tough times on and off the field.
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.
No. Epithalamin is a heterogeneous peptide fraction obtained from pineal gland extract and contains many components. Epitalon is a single synthetic tetrapeptide with the sequence Ala-Glu-Asp-Gly. Researchers synthesised the shorter peptide while attempting to identify active sequences within the extract.