If you have been reading about AEDG and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2026-05-23. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
Reported biological findings come mainly from cell culture and rodent experiments. Those studies describe changes in telomerase catalytic subunit expression, melatonin rhythm amplitude, and antioxidant enzyme activity after peptide exposure. Human data are sparse and consist of small trials with limited blinding and inconsistent endpoints. The proposed mechanisms remain hypotheses rather than established facts, and there is no consensus on whether effects observed in animals carry over to people. Independent replication outside the original research groups is limited, which is a recognised gap in the published literature.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic tetrapeptide | Four amino acid residues |
| Residue sequence | Ala-Glu-Asp-Gly | Abbreviated AEDG |
| Approximate mass | 390.35 Da | Monoisotopic, free base form |
| Parent preparation | Epithalamin extract | Derived from pineal tissue |
| Common spelling variants | Epithalon, epithalone, AEDG | Affects literature retrieval |
Discussions in the literature often conflate three distinct entities: the pineal extract epithalamin, the isolated tetrapeptide AEDG, and commercial preparations sold under similar names. Reviews citing older Russian-language studies sometimes omit detail on purity, route of administration and control groups, which makes cross-study comparison difficult. Researchers working with the compound generally note the need for independent replication, standardized enzyme assays, and clearer reporting of peptide identity. These caveats are relevant when weighing claims that appear in secondary sources rather than in primary reports.
（TG:@pojiaai）Epitalon is a synthetic linear tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, abbreviated AEDG. It emerged from work on epithalamin, a peptide fraction prepared from bovine pineal tissue, and was designed as a short, chemically defined analogue of that extract. Early publications came mainly from Russian laboratories studying pineal peptides and aging-related endpoints. The compound appears in the literature under several spellings, including epithalon and epithalone, which complicates systematic searching. Its small size makes solid-phase assembly and routine analytical characterization straightforward.
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.
Analytical characterization of epitalon relies on standard peptide methods. Reverse-phase high-performance liquid chromatography is used to assess purity, and mass spectrometry confirms identity by checking the observed mass against the expected value near 390 daltons. Amino acid analysis can verify composition. Because the peptide is short and hydrophilic, it elutes early on many reverse-phase columns, so method development often requires ion-pairing reagents to achieve adequate retention and resolution from related impurities.
Storage and handling follow conventional peptide practice. Lyophilized epitalon is typically kept refrigerated or frozen, protected from moisture and light, and allowed to equilibrate to room temperature before opening to avoid condensation. Once dissolved, aqueous solutions are usually stored cold and used within a short period, since dilute peptide solutions can support microbial growth and may slowly degrade. The absence of cysteine and methionine reduces, but does not eliminate, oxidation concerns during long-term storage.
== Research == Ceftriaxone has also been investigated for efficacy in preventing relapse to cocaine addiction. Ceftriaxone seems to increase excitatory amino acid transporter-2 pump expression and activity in the central nervous system, so has a potential to reduce glutamatergic toxicity. Ceftriaxone has been shown to have neuroprotective properties in a number of neurological disorders, including spinal muscular atrophy and amyotrophic lateral sclerosis (ALS). Despite earlier negative results in the 1990s, a large clinical trial was undertaken in 2006 to test ceftriaxone in ALS patients, but was stopped early after it became clear that the results would not meet the predetermined criteria for efficacy.
== Bowfin body-shape evolution and development == The first fish lacked jaws and used negative pressure to suck their food in through their mouths. The jaw in the bowfin is a result of its evolutionary need to be able to catch and eat bigger and more nutritious prey. As a result of being able to gather more nutrients, the bowfin is able to live a more active lifestyle. The jaw of a bowfin has several adaptations. The maxilla and premaxilla are fused and the posterior chondrocranium articulates with the vertebra, which allows the jaw freedom to rotate. The suspensorium includes several bones and articulates with the snout, brain case, and mandible. When the jaw opens, epaxial muscles lift the chondrocranium, which is attached to the upper jaw, while adductor muscles act to close the lower jaw. This ability to open and close the jaw helps the bowfin to be an active predator that can catch bigger prey and digest them. The vertebral column in bowfin is ossified and in comparison to earlier fish, the centra are the major support for the body, whereas in earlier fish, the notochord was the main form of support. In the bowfin, neural spines and ribs also increase in prominence, an evolutionary aspect that helps provide additional support and stabilize unpaired fins. The evolution of the vertebral column allows the bowfin to withstand lateral bending that puts the column under compression without breaking. This, in turn, allows the bowfin to have more controlled and powerful movements, in comparison to fish that have only a notochord.
{\displaystyle {\begin{aligned}{\frac {\partial f(t,j)}{\partial t}}&=2k_{+}m(t)f(t,j-1)-2k_{+}m(t)f(t,j)\\&+2k_{\rm {off}}f(t,j+1)-2k_{\rm {off}}f(t,j)\\&+k_{-}\sum _{i=j+1}^{\infty }f(t,i)-k_{-}(j-1)f(t,j)\\&+k_{1}m(t)^{n_{1}}\delta _{j,n_{1}}+k_{2}m(t)^{n_{2}}M(t)\delta _{j,n_{2}}\\\\\end{aligned}}}
CAS registry number – Chemical identifierPages displaying short descriptions of redirect targets Chemical nomenclature – Systematic naming of chemical compounds Commission on Isotopic Abundances and Atomic Weights – International scientific committee European Association for Chemical and Molecular Sciences Institute for Reference Materials and Measurements (IRMM) – Promotes a common European measurement system International Chemical Identifier (InChI) – Identifier for chemical substances International Union of Biochemistry and Molecular Biology (IUBMB) – International non-governmental organization International Union of Pure and Applied Physics (IUPAP) – Non-governmental organization for physics development List of chemical elements naming controversies National Institute of Standards and Technology (NIST) – Measurement standards laboratory in the United States Simplified molecular-input line-entry system (SMILES) – Chemical species structure notationPages displaying short descriptions of redirect targets
Sources: en.wikipedia.org
Camptocormia, also known as bent spine syndrome (BSS), is a symptom of a multitude of diseases that is most commonly seen in the elderly. It is identified by an abnormal thoracolumbar spinal flexion, which is a forward bending of the lower joints of the spine, occurring in a standing position. In order to be classified as BSS, the anterior flexion (the lower back bending) must reach 45 degrees anteriorly. This classification differentiates it from a similar syndrome known as kyphosis. Although camptocormia is a symptom of many diseases, there are two common origins: neurological and muscular. Camptocormia is treated by alleviating the underlying condition causing it through therapeutic measures or lifestyle changes.
1993/2629) Shropshire's Community Health Service National Health Service Trust (Establishment) Order 1993 (S.I. 1993/2630) Hill Livestock (Compensatory Allowances) Regulations 1993 (S.I. 1993/2631) National Lottery etc. Act 1993 (Commencement No. 1 and Transitional Provisions) Order 1993 (S.I. 1993/2632) South East London Mental Health National Health Service Trust (Establishment) Order 1993 (S.I. 1993/2633) Haringey Health Care National Health Service Trust (Establishment) Order 1993 (S.I. 1993/2634) North Staffordshire Combined Healthcare National Health Service Trust (Establishment) Order 1993 (S.I. 1993/2635) Lincoln District Healthcare National Health Service Trust (Establishment) Order 1993 (S.I. 1993/2636) Swindon and Marlborough National Health Service Trust (Establishment) Order 1993 (S.I. 1993/2637) Louth and District Healthcare National Health Service Trust (Establishment) Order 1993 (S.I. 1993/2638) North Kent Healthcare National Health Service Trust (Establishment) Order 1993 (S.I. 1993/2639) Medway National Health Service Trust (Establishment) Order 1993 (S.I. 1993/2640) Queen Victoria Hospital National Health Service Trust (Establishment) Order 1993 (S.I. 1993/2641) Dartford and Gravesham National Health Service Trust (Establishment) Order 1993 (S.I. 1993/2642) Worthing and Southlands Hospitals National Health Service Trust (Establishment) Order 1993 (S.I. 1993/2643) Gipsy Encampments (Borough of Holderness) Order 1993 (S.I. 1993/2644) Norfolk Mental Health Care National Health Service Trust (Establishment) Order 1993 (S.I.
== Further reading == Haymon, R.M. (2014). "Hydrothermal Vents at Mid-Ocean Ridges". Reference Module in Earth Systems and Environmental Sciences. doi:10.1016/b978-0-12-409548-9.09050-3. ISBN 978-0-12-409548-9. Van Dover, C. L.; Humphris, SE; Fornari, D; Cavanaugh, CM; Collier, R; Goffredi, SK; Hashimoto, J; Lilley, MD; Reysenbach, AL; Shank, TM; Von Damm, KL; Banta, A; Gallant, RM; Gotz, D; Green, D; Hall, J; Harmer, TL; Hurtado, LA; Johnson, P; McKiness, ZP; Meredith, C; Olson, E; Pan, IL; Turnipseed, M; Won, Y; Young CR, 3rd; Vrijenhoek, RC (13 September 2001). "Biogeography and Ecological Setting of Indian Ocean Hydrothermal Vents". Science. 294 (5543): 818–823. Bibcode:2001Sci...294..818V. doi:10.1126/science.1064574. PMID 11557843. S2CID 543841.{{cite journal}}: CS1 maint: numeric names: authors list (link) Van Dover; Cindy Lee (2000). The Ecology of Deep-Sea Hydrothermal Vents. Princeton University Press. ISBN 978-0-691-04929-8. Beatty, J. T.; Overmann, J.; Lince, M. T.; Manske, A. K.; Lang, A. S.; Blankenship, R. E.; Van Dover, C. L.; Martinson, T. A.; Plumley, F. G. (20 June 2005). "An obligately photosynthetic bacterial anaerobe from a deep-sea hydrothermal vent". Proceedings of the National Academy of Sciences. 102 (26): 9306–9310. Bibcode:2005PNAS..102.9306B. doi:10.1073/pnas.0503674102. PMC 1166624. PMID 15967984.
All three genes localize to chromosome 19q.13.3 in the order of FPR1, FPR2, and FPR3 to form a cluster which also includes the gene for another G protein-coupled chemotactic factor receptor, the C5a receptor (also termed CD88), which binds and is activated by complement component 5a (C5a) and GPR77, a second C5a anaphylatoxin chemotactic receptor C5a2 (C5L2), a second C5a receptor of debated function which has the structure of a G protein coupled receptor but fails to couple to G proteins. These points are of interest because C5a is generated by the interaction of bacteria with blood plasma components to activate the complement cascade which then cleave C5a from Complement component 5. Thus, bacteria produce a family of oligopeptide chemotactic factors plus activate host complement pathways to generate C5a, which, like the formylated oligopeptides, is a neutrophil chemotactic factor that operates through receptors whose genes cluster with those for the three formyl peptide receptors. Furthermore, bacteria-induced complement activation also causes the formation of complement component 3a (C3a) by cleavage from complement component 3; C3a is a neutrophil chemotactic factor which operates through a G protein coupled chemotactic factor receptor, the C3a receptor, whose gene is located at chromosome 12p13; C3a also acts through C5L2.
There is one atrium (which receives blood) and one ventricle (which expels blood) for each circulation, with a total of four chambers: left atrium, left ventricle, right atrium and right ventricle. Chambers of the heart are separated by the atrioventricular valves, which include the tricuspid valve on the right and the mitral valve on the left. The ventricles are separated from the large arteries via the semilunar valves. The heart is lined by a double-layered sac known as the pericardium. Further circulatory routes include the coronary circulation to the heart itself, the cerebral circulation to the brain, renal circulation to the kidneys, and bronchial circulation to the bronchi in the lungs.
Sources: en.wikipedia.org
MDMA is being investigated as a potential treatment for social impairments in autism. The British critical psychiatrist Joanna Moncrieff has critiqued the use and study of MDMA and related drugs like psychedelics for treatment of psychiatric disorders, highlighting concerns including excessive hype around these drugs, blurred lines between medical and recreational use, flawed clinical trial findings, financial conflicts of interest, strong expectancy effects and large placebo responses, short-term benefits over placebo, and their potential for adverse effects, among others.
== Home media == Dredd was released on DVD, Blu-ray and Digital Download on 8 January 2013 in North America, and 14 January in the UK. The Blu-ray edition contains the 2D and 3D versions of the film and a digital copy. The DVD and Blu-ray editions contain seven featurettes: "Mega-City Masters: 35 Years of Judge Dredd", "Day of Chaos: The Visual Effects of Dredd 3D", "Dredd", "Dredd's Gear", "The 3rd Dimension", "Welcome to Peachtrees", and a "Dredd Motion Comic Prequel" narrated by Urban. During its first week on sale in the UK, Dredd was the number 1 selling DVD and Blu-ray. During the week of its release in North America, it was the number 1 selling DVD and Blu-ray with approximately 650,000 units sold, and Blu-ray units accounting for nearly 50% of that figure. It was also the best-selling digital download for that period. Sales spiked in the United Kingdom in June 2013, following a reported rumour that it could influence DNA Films' decision to pursue a sequel. By September 2013, Dredd was estimated to have earned approximately $10 million in home media sales in North America, while in the UK it marked over 270 days in online-retailer Amazon's top 100 selling home media. By July 2017, this sales figure was estimated to have increased to $20 million.
=== Other uses === Ethyl carbamate was primarily an intermediate in the preparation of amino resins, that were in turn used as crosslinking agents for permanent-press textile treatments to create "wash-and-wear" fabrics. Other uses included as solvent or intermediates in the manufacture of pesticides, cosmetics and pharmaceuticals.
== Plot == While working with a team from the University of Chicago on a project to convert hydrogen from water into clean energy, student machinist Eddie Kasalivich inadvertently discovers a sound frequency in his home laboratory that perfectly stabilizes their process the next day. As the team celebrates with a party at the project laboratory, Dr. Paul Shannon, the leader of the project, and Dr. Alistair Barkley, the project manager, debate whether or not to share the scientific discovery. Later that night, project physicist Dr. Lily Sinclair finds her car unable to start, so Eddie gets her home by bus. Back in the laboratory, Alistair and assistant Dr. Lu Chen prepare to upload their discovery to the Internet to share the breakthrough with the world, while a van approaches the premises. Chen hears a noise and goes outside to investigate, but is kidnapped by unknown assailants as Alistair is also attacked. Once he has dropped Lily off at Alistair's house, where she lives on the third floor, Eddie returns to the laboratory to retrieve his motorcycle but notices a suspicious van departing. Hearing alarms, he runs inside to find Alistair dead with a plastic bag over his head and Chen missing. As the hydrogen reactor has become dangerously unstable, Eddie, unable to deactivate it, speeds away as a concealed detonator triggers a massive hydrogen explosion that destroys the laboratory and eight blocks' worth of surrounding streets.
==== I. Lipophilic Drugs ==== Microbubbles can facilitate the local targeting of hydrophobic drugs through the incorporation of these agents into the microbubble lipid shell. This encapsulation technique reduces systemic toxicity, increases drug localization, and improves the solubility of hydrophobic drugs. For increased localization, a targeting ligand can be appended to the exterior of the microbubble. This improves treatment efficacy. One drawback of the lipid-encapsulated microbubble as a drug delivery vehicle is its low payload efficacy. To combat this, an oil shell can be incorporated to the interior of the lipid monolayer to enhance payload efficacy.
Sources: en.wikipedia.org
It is based on epithalamin, a peptide-rich preparation obtained from pineal gland tissue and studied in the former Soviet Union. Researchers later identified the tetrapeptide AEDG as a constituent fragment of that material. Modern supplies are produced by chemical synthesis rather than tissue extraction.
No. Epithalamin is a heterogeneous extract containing many peptides, while epitalon is a single synthesised tetrapeptide. Publications sometimes treat findings from the two as equivalent, which is a common source of confusion. Their compositions differ and they are not interchangeable in analytical terms.
Most published work uses cell cultures or rodents because those models are faster and less costly to run. The few human trials that have been reported are small, and several lack control groups or blinding. This restricts what can reasonably be concluded about effects in people.
The molecule lacks aromatic residues, so it absorbs weakly near 280 nanometres, the wavelength applied to many other peptides. The peptide bond absorbs strongly below 220 nanometres, making 214 nanometres a practical compromise. Gradient methods must therefore use mobile phases with low ultraviolet absorbance to keep the baseline clean.