A practical reference on electrospray ionisation: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2025-08-31 and is reviewed periodically as new material appears.
Storage practice centres on limiting moisture, oxygen, and repeated temperature cycling. Freeze-dried powder is generally held desiccated at minus twenty degrees Celsius or colder and protected from light. Reconstituted solutions are markedly less stable, and the aspartate-glycine junction is prone to succinimide formation at neutral to mildly alkaline pH. Portioning material into single-use aliquots reduces degradation compared with repeated freeze-thaw cycles. Stability data specific to this tetrapeptide remain scarce, so most handling guidance is extrapolated from general peptide chemistry rather than measured directly.
Documentation accompanying research peptides usually includes a certificate of analysis listing the batch number, purity figure, and test methods applied. Buyers comparing suppliers should check whether the reported purity refers to chromatographic area or to a mass-balance calculation, because the two are not equivalent. Counter-ion content, residual solvents, and water content are sometimes omitted from such certificates even though they affect the actual peptide mass present. Independent verification through a second laboratory is the most direct way to confirm that a supplied material matches its label.
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 |
|---|---|---|
| Appearance | White to off-white powder | Freeze-dried solid |
| Solubility class | Freely soluble in water | Aqueous buffers also suitable |
| Typical storage temperature | Minus 20 degrees Celsius or colder | Desiccated and light protected |
| Typical analytical method | RP-HPLC with UV detection | 214 nm on C18 column |
| Identity confirmation | Electrospray mass spectrometry | Sequence verified separately |
No pharmacopoeial monograph exists for this peptide, so quality rests on the supplier's internal specifications and on whatever independent testing a purchaser arranges. Certificates of analysis differ widely in which tests they report and in the limits applied. The counter-ion introduced during purification, commonly acetate or trifluoroacetate, changes the net peptide content of a given mass of powder, so two samples of equal weight may not contain equal amounts of the active sequence. Third-party laboratories can verify purity, identity, residual solvents, and counter-ion content for a fee, which makes documentation more informative than labelling.
Verification of a sample usually begins with reversed-phase high-performance liquid chromatography, which resolves the peptide from truncated sequences and other impurities and expresses purity as a percentage of total peak area. Mass spectrometry by electrospray ionisation or matrix-assisted laser desorption supplies an independent check, because the measured mass can be compared against the theoretical value for AEDG. Amino acid analysis or tandem mass spectrometry sequencing can confirm residue order. Each of these methods answers a different question: a purity figure does not establish identity, and an identity match does not establish how much of the material is intact peptide.
In its supplied form epitalon is a white to off-white powder, usually lyophilized and often hygroscopic. It dissolves readily in water and in aqueous buffers, and it is commonly handled as the acetate or trifluoroacetate salt to improve stability during purification and drying. The amide backbone is labile in aqueous media, so solutions are less durable than the dry solid. Handling notes in the chemical literature therefore emphasize keeping the powder dry, cool and shielded from light until it is dissolved.
Epitalon is a synthetic tetrapeptide whose sequence is alanine-glutamate-aspartate-glycine, written in single-letter code as AEDG. The four residues are joined by three peptide bonds, giving a linear backbone with no branching and no disulfide bridges. Its calculated molecular mass for the free form is approximately 390.3 daltons, a figure that rises when the compound is supplied as an acetate or trifluoroacetate salt. Because the chain is short, the molecule is defined entirely by its residue order rather than by any folded three-dimensional structure.
The compound is described in the literature as a derivative of epithalamin, a preparation obtained from bovine pineal tissue. Work on this peptide family was carried out mainly by a research group in Saint Petersburg beginning in the 1980s, and the substance was later registered for clinical use in Russia under the name Epitalon. Outside that region it is generally treated as a research chemical rather than an approved medicine. Statements about its biological activity rest on a relatively small number of studies, and independent replication remains limited.
Human data are limited to small studies, often without the randomization, blinding, or control groups expected in contemporary clinical research. Reported outcomes have included changes in melatonin levels, immune markers, and subjective measures, but sample sizes were generally too small to support firm conclusions. Some reviews treat the peptide as promising while noting methodological weaknesses; others question whether the observed effects are specific. The compound is frequently discussed in longevity-focused communities, where enthusiasm often outpaces the published evidence. Separating established findings from speculation is therefore important when reading summaries of this research.
Epitalon emerged from research conducted in Saint Petersburg by Vladimir Khavinson and colleagues, who studied short peptides as potential regulators of aging. The work built on epithalamin, a pineal gland extract reported to influence neuroendocrine function. Epitalon was designed as a synthetic counterpart with a defined sequence, allowing reproducible experiments that extracts could not support. Early publications described effects on melatonin rhythms and lifespan in animal models. These findings circulated mainly in Russian-language journals during the 1990s, which limited their visibility among English-speaking researchers.
The most widely cited claim is that epitalon activates telomerase and thereby extends telomere length. Supporting evidence comes largely from cultured human cells, where treatment was associated with increased telomerase activity and delayed replicative senescence. Telomerase activation is a biologically consequential effect, since the enzyme is largely silenced in most somatic cells. However, the route by which a short peptide would reach and act on the enzyme's regulatory machinery has not been established. Independent replication in human trials is scarce, so the link between cell-culture observations and whole-body aging remains an open question.
On 21 March 2012, the Matazetas uploaded a video on the Blog del Narco. The recording, which is slightly over four minutes, shows several men dressed in black, with ski-masks and heavily armed; some of them (apparently the leaders) were sitting down at a table—as has been observed in other videos of the CJNG. In the communiqué, the men said that they will "clean up the states of Guerrero and Michoacán", and informed the federal government, the Armed Forces and the Federal Police that the CJNG has no problems with them. Then they went on to say that the CJNG was going to start a turf war "against the Knights Templar Cartel, who were reportedly "abusing innocent people" and operating through "kidnappings, extortion, protection racketeering, property theft, and rape." Vigilante groups consisting of local townspeople, known as autodefensas, had been taking arms against the Knights Templar for several years. Now, CJNG and local autodefensas are forming unprecedented alliances between the cartel and civilians in order to disrupt a common enemy. CJNG's significant funding allows them to supply the autodefensas with military-grade arms, changing the tide of the conflict between the Knights Templar and civilians. Consequently, both the autodefensas and CJNG are mutually benefitting as CJNG offers greater protection to victims of the Knights Templar while receiving support from the community in combatting a regional rival.
This results with a polymer that has favorable interactions with the solution, allowing the polymer to form more linearly. Grafting from therefore has a higher grafting density since there are more access to chain ends. Peptide synthesis can provide one example of a 'grafting from' synthetic process. In this process, an amino acid chain is grown by a series of condensation reaction from a polymer bead surface. This grafting technique allows for excellent control over the peptide composition as the bonded chain can be washed without desorption from the polymer. Polymeric coatings are another area of applied grafting techniques. In the formulation of water-borne paint, latex particles are often surface modified to control particle dispersion and thus coating characteristics such as viscosity, film formation, and environmental stability (UV exposure and temperature variations).
This is a list of investigational generalized anxiety disorder drugs, or drugs that are currently under development for clinical use in the treatment of generalized anxiety disorder (GAD) but are not yet approved. Chemical/generic names are listed first, with developmental code names, synonyms, and brand names in parentheses. The format of list items is "Name (Synonyms) – Mechanism of Action [Reference]". This list was last comprehensively updated in September 2025. It is likely to become outdated with time.
2,5-Dimethoxy-4-butylamphetamine (DOBU) is a psychedelic drug of the phenethylamine, amphetamine, and DOx families related to DOM. It is the derivative of DOM in which the methyl group at the 4 position has been replaced with a butyl group. The drug is taken orally. It acts as a serotonin receptor agonist, including of the serotonin 5-HT2A receptor. The drug produces psychedelic-like effects in animals. DOBU was first described in the literature by Alexander Shulgin in 1970. Subsequently, it was described in greater detail by Shulgin in his 1991 book PiHKAL (Phenethylamines I Have Known and Loved).
=== November === November 1 The U.S. Supreme Court begins its arguments about the Texas Heartbeat Act. Kenosha unrest shooting: The trial of Kyle Rittenhouse begins in Kenosha. November 2 New Jersey and Virginia gubernatorial elections are held. Republican Glenn Youngkin wins the Virginia race, while Democrat Phil Murphy wins re-election in the New Jersey race. Republican Winsome Sears wins the Virginia lieutenant governor's race and will become the first black and first female lieutenant governor of the state of Virginia. A special election is held in Ohio to fill a vacancy in its 11th congressional district left by Marcia Fudge when she resigned to become President Biden's Secretary of Housing and Urban Development. Democrat Shontel Brown wins with 81,636 of the 103,565 votes cast (78.8%). Another special election is held in Ohio to fill a vacancy in its 15th congressional district due to the resignation of Steve Stivers effective May 15 to become president and CEO of the Ohio Chamber of Commerce. Republican Mike Carey wins with 93,255 of the 160,012 votes cast (58.3%). The Atlanta Braves win the 2021 World Series, defeating the Houston Astros. Las Vegas Raiders wide receiver Henry Ruggs III is involved in an automobile accident where a 23-year-old woman is killed. At the time of the crash, Ruggs was driving 120 mph (190 km/h). He was also over double the legal intoxication level as well. The Raiders immediately cut him later that day.
Sources: en.wikipedia.org
== Family == The only child of Thorburn Robertson (1851–1932), and Sarah Ann Robertson (1859-?), née Brailsford, Thorburn Brailsford Robertson was born at Edinburgh, Scotland on 4 March 1884. In the early 1890s he migrated to South Australia with his mother to join his father who was attorney for Kangarilla Silver Mines Ltd, and the manager of its copper mine at Callington, near Murray Bridge, South Australia. The Robertsons lived at Callington for a number of years.
== Further reading == Juretic, D., 2021. Bioenergetics: a bridge across life and universe. CRC Press. Lehninger, Albert L (1971). Bioenergetics: The Molecular Basis of Biological Energy Transformations (2nd ed.). Addison-Wesley. ISBN 0-8053-6103-0. Nicholls, David G.; Ferguson, Stuart J. (2002). Bioenergetics (3rd ed.). Academic Press. ISBN 0-12-518124-8. Green DE, Zande HD (September 1981). "Universal energy principle of biological systems and the unity of bioenergetics". Proc. Natl. Acad. Sci. U.S.A. 78 (9): 5344–7. Bibcode:1981PNAS...78.5344G. doi:10.1073/pnas.78.9.5344. PMC 348741. PMID 6946475.
The penis is sometimes pierced or decorated by other body art. Other than circumcision, genital alterations are almost universally elective and usually for the purpose of aesthetics or increased sensitivity. Piercings of the penis include the Prince Albert, apadravya, ampallang, dydoe, deep shaft and frenum piercings. Foreskin restoration or stretching is a further form of body modification, as well as implants under the shaft of the penis. Another type of alteration to the penis is genital tattooing. Trans women who undergo sex reassignment surgery have their penis surgically modified into a vagina or clitoris via vaginoplasty or clitoroplasty respectively. Trans men who undergo such surgery have a phalloplasty or metoidioplasty. Other practices that alter the penis are also performed, although they are rare in Western societies without a diagnosed medical condition. Apart from penectomy, perhaps the most radical of these is subincision, in which the urethra is split along the underside of the penis. Subincision originated among Aboriginal Australians, although it is now done by some in the U.S. and Europe.
Zalcitabine (2′-3′-dideoxycytidine, ddC), also called dideoxycytidine, is a nucleoside analog reverse-transcriptase inhibitor (NRTI) sold under the trade name Hivid. Zalcitabine was the third antiretroviral to be approved by the Food and Drug Administration (FDA) for the treatment of HIV/AIDS. It is used as part of a combination regimen. Zalcitabine appears less potent than some other nucleoside RTIs, has an inconvenient three-times daily frequency and is associated with serious adverse events. For these reasons it is now rarely used to treat human immunodeficiency virus (HIV), and it has even been removed from pharmacies entirely in some countries.
After the Battle of Muye, the Shang dynasty was overthrown by Zhou (led by Ji Fa), which had emerged as a western state along the Wei River in the 2nd millennium BCE. The Zhou dynasty shared the language and culture of the Shang people, and extended their reach to encompass much of the area north of the Yangtze River. Through conquest and colonization, much of this area came under the influence of sinicization and this culture extended south. However, the power of the Zhou kings fragmented not long afterwards, and many autonomous vassal states emerged. This dynasty is traditionally divided into two eras – the Western Zhou (1046–771 BCE) and the Eastern Zhou (770–256 BCE) – with the latter further divided into the Spring and Autumn (770–476 BCE) and the Warring States (476–221 BCE) periods. It was a period of significant cultural and philosophical diversification (known as the Hundred Schools of Thought) and Confucianism, Taoism and Legalism are among the most important surviving philosophies from this era.
Sources: en.wikipedia.org
== Health and death == When Todd signed on to film Final Destination Bloodlines in 2023, he privately let the producers know that he had terminal stomach cancer. During filming in early 2024, they elected to allow Todd to improvise the last lines of his character Mr. Bludworth so he could give a proper goodbye to audiences: "Life is precious, enjoy every single second. You never know when ... Good luck". Todd died at his home in Marina del Rey, California, on November 6, 2024, at the age of 69. His cause of death was listed as stomach cancer. Both Final Destination Bloodlines and Indiana Jones and the Great Circle were dedicated to his memory. Insomniac Games intended to make a spin-off video game starring Venom after Todd played the character in Marvel's Spider-Man 2. However, the game was reportedly cancelled or placed on the backburner after his death. Both his co-stars Nadji Jeter (whom Todd affectionally called "nephew") and Yuri Lowenthal attended his funeral.
Captodiame (INN), also known as captodiamine, is an antihistamine sold under the trade names Covatine, Covatix, and Suvren which is used as a sedative and anxiolytic. The structure is related to diphenhydramine. A 2004 study suggested captodiame may be helpful in preventing benzodiazepine withdrawal syndrome in people discontinuing benzodiazepine treatment. In addition to its actions as an antihistamine, captodiamine has been found to act as a 5-HT2C receptor antagonist and σ1 receptor and D3 receptor agonist. It produces antidepressant-like effects in rats. However, captodiamine is unique among antidepressant-like drugs in that it increases brain-derived neurotrophic factor (BDNF) levels in the hypothalamus but not in the frontal cortex or hippocampus. This unique action may be related to its ability to attenuate stress-induced anhedonia and corticotropin-releasing factor (CRF) signaling in the hypothalamus.
The area returned to the English crown in 1157, when Henry II of England took possession of the area (from Malcolm IV of Scotland). Henry II formed two new counties from the former earldom: Westmorland and Carliol – originally an abbreviation of the Latin Carlioliensis '[bishop] of Carlisle'. Westmorland also included areas formerly part of the Earldom of Lancaster. The lead- and silver-mining area of Alston, previously associated with the Liberty of Tynedale was later also added to the new county of Carliol for financial reasons. By 1177, Carliol had become known as Cumberland. The border between England and Scotland was made permanent by the Treaty of York in 1237. The population of Cumberland in the 1841 census was 178,038.
Attachment of alkyl groups to DNA bases, resulting in the DNA being fragmented by repair enzymes in their attempts to replace the alkylated bases, preventing DNA synthesis and RNA transcription from the affected DNA. DNA damage via the formation of cross-links which prevents DNA from being separated for synthesis or transcription. Induction of mispairing of the nucleotides leading to mutations. The precise mechanisms by which chlorambucil acts to kill tumor cells are not yet completely understood.
=== Alphabet methods === A special class of protein structural alignment programs convert the input structure into a sequence of letters describing the structure. This allows methods from sequence alignment to be translated into this field to enable more efficient searching, and in some implementations, to also align and superimpose in real 3D space.
Sources: en.wikipedia.org
Reversed-phase high-performance liquid chromatography with ultraviolet detection at 214 nanometres is the usual approach. Peak area percentage provides a purity figure relative to other components in the sample. Mass spectrometry is then applied to confirm identity.
Aspartate can cyclise into a succinimide intermediate that later hydrolyses back as isoaspartate. Both forms share the same molecular mass, so mass spectrometry alone cannot tell them apart. This shapes how purity data should be interpreted.
Freeze-dried material is normally kept desiccated below minus twenty degrees Celsius and shielded from light. Solutions are prepared shortly before use and held cold. Repeated thawing is avoided because it accelerates aggregation and degradation.
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.