The short version of Epithalamin fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2025-10-10 and is reviewed periodically as new material appears.
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.
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.
Verification of research-grade material involves comparing a supplier chromatogram against an in-house reference, checking the observed mass against the calculated value, and where possible confirming residue order by tandem mass spectrometry or enzymatic peptide mapping. Purity claims should be read alongside the method used to obtain them, because detection wavelength and integration settings alter the result. Batch-specific data, rather than a generic grade statement, is the informative part of a certificate.
Identity and purity of epitalon samples are normally established by reversed-phase high-performance liquid chromatography with ultraviolet detection near 214 nanometres, combined with mass spectrometry. The mass spectrum confirms the expected molecular ion and can reveal truncated or oxidised by-products. Amino acid analysis after acid hydrolysis verifies that the four residues are present in the expected ratio. Certificates typically report a purity figure taken from chromatographic peak area, expressed as a percentage of total integrated signal.
Lyophilised epitalon is generally held at minus twenty degrees Celsius in a sealed container kept dry and dark. Cooler conditions are sometimes recommended for long-term archives. The solid takes up moisture readily enough that repeated opening of a vial introduces water, so dividing a batch into smaller portions before storage lowers degradation risk. Aqueous solutions are less durable than the dry powder and are usually prepared shortly before use, then kept cold and shielded from light to slow hydrolysis and oxidation.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic tetrapeptide | Four residues, linear chain |
| Residue sequence | Ala-Glu-Asp-Gly | Single-letter form AEDG |
| Calculated mass | 390.3 daltons | Value for the free, uncharged form |
| Appearance | White to off-white powder | Usually supplied lyophilized |
| Solubility | Freely soluble in water | Often handled as a salt form |
The peptide emerged from research carried out in Saint Petersburg from the late 1980s onward, where investigators searched for shorter active fragments of a pineal preparation known as epithalamin. The name epitalon was chosen to reflect that parent extract. Early reports described effects on neuroendocrine markers and on the lifespan of laboratory animals. Much of that work appeared in Russian-language journals, with English translations following later, which affects how readily the original protocols can be assessed by outside groups.
Published studies on epitalon are dominated by a small number of research groups, and independent replication in other laboratories remains limited. Proposed mechanisms include activation of telomerase and modulation of melatonin rhythms, but the evidence for either rests mainly on cell cultures and animal models. Whether the peptide produces comparable effects in humans is an open question, and the absence of large controlled trials means the literature is best read as exploratory rather than settled.
Identity is normally established by reversed-phase high-performance liquid chromatography combined with mass spectrometry, a pairing that separates components and confirms molecular mass at once. Purity is quoted as a percentage from the chromatogram, and figures above ninety-five percent are a frequent commercial specification. Amino acid analysis or sequencing supplies further confirmation when required. Because many short peptides behave similarly under chromatography, retention time alone does not establish sequence; the mass measurement is what separates one tetrapeptide from another, and certificates should report both.
Short peptides such as AEDG are normally supplied as a freeze-dried solid and are kept dry, cold, and shielded from light. Holding at minus twenty degrees Celsius is common for the long term, while a refrigerator suffices for brief periods before use. The material takes up moisture to some degree, so containers should stay sealed and be allowed to reach room temperature before opening, which limits condensation on the contents. Repeated warming and cooling of a single container is discouraged because it admits water and can lower the amount of intact peptide.
Gene expression in mammals is regulated by many cis-regulatory elements, including core promoters and promoter-proximal elements that are located near the transcription start sites of genes, upstream on the DNA (towards the 5' region of the sense strand). Other important cis-regulatory modules are localized in DNA regions that are distant from the transcription start sites. These include enhancers, silencers, insulators and tethering elements. Enhancers and their associated transcription factors have a leading role in the regulation of gene expression. Enhancers are genome regions that regulate genes. Enhancers control cell-type-specific gene expression programs, most often by looping through long distances to come in physical proximity with the promoters of their target genes. Multiple enhancers, each often tens or hundred of thousands of nucleotides distant from their target genes, loop to their target gene promoters and coordinate with each other to control gene expression. The illustration shows an enhancer looping around to come into proximity with the promoter of a target gene. The loop is stabilized by a dimer of a connector protein (e.g. dimer of CTCF or YY1). One member of the dimer is anchored to its binding motif on the enhancer and the other member is anchored to its binding motif on the promoter (represented by the red zigzags in the illustration). Several cell function-specific transcription factors (among the about 1,600 transcription factors in a human cell) generally bind to specific motifs on an enhancer.
== Industrial process design == In a typical scenario, an industrial process will use an extraction step in which solutes are transferred from the aqueous phase to the organic phase; this is often followed by a scrubbing stage in which unwanted solutes are removed from the organic phase, then a stripping stage in which the wanted solutes are removed from the organic phase. The organic phase may then be treated to make it ready for use again. After use, the organic phase may be subjected to a cleaning step to remove any degradation products; for instance, in PUREX plants, the used organic phase is washed with sodium carbonate solution to remove any dibutyl hydrogen phosphate or butyl dihydrogen phosphate that might be present.
In January 2016, fellow El Mencho brother-in-law Elvis González Valencia was arrested as well, though he was later released in December 2016. In 2018, two more El Mencho brother-in-laws, Arnulfo and Ulises Gonzalez Valencia, was arrested as well. In May 2019, the U.S. government acknowledged that Ulises Gonzalez Valencia, a key CJNG leader who had been issued new Office of Foreign Assets Control sanctions, had in fact been arrested in 2018. In July 2018, Mexican authorities arrested José Guadalupe Rodríguez Castillo (alias 'El 15'), a local leader of the cartel. His arrest is related to the disappearance of three Italian businessmen in the Southern Jalisco town of Tecalitlán in January 2018. In March 2019, a senior CJNG leader, who chose to remain anonymous and was only identified as "El 20", was arrested by Mexican authorities. "El 20", who remained anonymous, was second-in-command to the CJNG. More than 80 elements of 41 Military Zone, as well as the Navy, and the Federal Police, as well as four CJNG members who also remained anonymous, were also arrested with "El 20." In April 2019, Adrián Alonso Guerrero Covarrubias, known as "El 8" or "El M", was arrested for drug trafficking and kidnapping. Guerrero served as head of the cartel's operations in the Ciénega and northern Los Altos regions in Jalisco and all of southeastern Guanajuato, and is the godson to cartel leader Nemesio Oseguera Cervantes. In February 2020, El Mencho's daughter Jessica Johana, 33, known as "La Negra" was arrested in Washington D.C.
Pressure ulcer – Also known as decubitus ulcers or bedsores, this type of wound is a result of chronic pressure to the skin over a prolonged period. While most individuals have intact sensation and motor function which allow for frequent positional change to prevent the formation of such ulcers, older individuals are particularly susceptible to this type of chronic injury due to impaired neurosensory responses. Pressure ulcers can occur in as little as two hours of immobility in a bedridden patient or person who is otherwise unconscious/sedated (surgery, syncope, etc.). In the United States, pressure ulcers are graded using the National Pressure Injury Advisory Panel (NPIAP) system. In this system, ulcers are graded on wound depth with stage 1 being the least severe (erythema, intact skin) and stage 4 being full thickness damage through subcutaneous tissue down to muscle, tendon, or bone. Any ulcer that cannot be assessed due to overlying eschar is considered unstageable.
Light and temperature impact the speed of deterioration, especially in combination with other agents of decay. Exposure of any length to light causes fading. Light both visible and UV can bleach and dry textiles as well as fade color. It is recommended that light is kept at 50 lux for textiles while on display. The length of exposure to light is determined by the type of textile and the object's current condition. Physical agents of decay include the natural breakdown of biological material, which causes fabrics to become more brittle as they age. Humidity is a factor that impacts textile fibers. Loss of moisture decreases the elasticity and increases brittleness. An environment that is too humid encourages pest activity and the growth of mold. Pests affect the physical makeup of textiles by eating fibers, and this destabilizes the fabrics. Pest activity can also discolor materials. Mold weakens and stains textiles. Chemical deterioration of textiles is caused by a variety of interactions. For example, the interaction of fibres with metals, pollutants, adhesives and other even other fibers can cause deterioration. Oxidation of metal threads or adornments can discolor and tarnish textiles due to the chemical reaction between the oxygen in the air and the fibers. Pollution impacts textiles. Pollution can come from the environment or the actual textile manufacturing process. These pollutants include pollen, mold, skin cells, ash, dirt and metal dust. Sources can include the museum exhibit and storage materials and air coming in from outside the museum.
Sources: en.wikipedia.org
22 September It is reported that eight-year-old Aditi Shankar has become the first child in the UK to receive a kidney transplant that will not require her to take medication to prevent the organ being rejected, and that she is healthy and has returned to school. In his first statement since further allegations were made against him, Russell Brand posts a video on social media describing his week as "extraordinary and distressing". 23 September The government's home energy efficiency taskforce is scrapped. Members of the anti-monarchist pressure group Republic stage what they describe as the "first-ever" protest inside Buckingham Palace. 24 September – Home Secretary Suella Braverman orders a review into armed policing, after 300 firearms officers hand in their weapons, following concerns over a police officer charged with murdering 24-year-old Chris Kaba. Most of the officers return to their duties the following day. 25 September A hearing at Manchester Crown Court determines that Lucy Letby will face a retrial for one of the six counts of attempted murder that the jury at her original trial was unable to reach a verdict on; a provisional trial date is set for 10 June 2024. The Metropolitan Police are to investigate allegations of non-recent sexual offences following recent reports about comedian Russell Brand. 26 September Home Secretary Suella Braverman tells a US think tank the 1951 Refugees Convention is no longer fit for the modern age, and that being discriminated against for being gay or female should not be enough to qualify for refugee status.
=== Antibody-free protein detection === While protein detection with antibodies is still very common in molecular biology, other methods have been developed as well, that do not rely on an antibody. These methods offer various advantages, for instance they often are able to determine the sequence of a protein or peptide, they may have higher throughput than antibody-based, and they sometimes can identify and quantify proteins for which no antibody exists.
Lasers can cause biological damage due to the properties of their radiation and their sometimes extremely concentrated electromagnetic power. For this reason, lasers must be labeled with standardized warnings depending on the laser class. The classification is based on the DIN standard EN 60825-1, which distinguishes between ranges of wavelengths and exposure times that lead to characteristic injuries and injury thresholds for power or energy density. The CO2-Laser was developed in 1964 by the Indian electrical engineer and physicist Chandra Kumar Naranbhai Patel (*1938) at the same time as the Nd:YAG laser (neodymium-doped yttrium aluminum garnet laser) at Bell Laboratories by LeGrand Van Uitert (1922-1999) and Joseph E. Geusic (*1931) and the Er:YAG laser (erbium-doped yttrium aluminum garnet laser) and has been used in dentistry since the early 1970s. In the hard laser field, two systems in particular are emerging for use in the oral cavity: the CO2 laser for use in soft tissue and the Er:YAG laser for use in dental hard and soft tissue. The goal of soft laser treatment is to achieve biostimulation with low energy densities. The Commission on Radiological Protection strongly recommends that the possession and purchase of class 3B and 4 laser pointers be regulated by law to prevent misuse. This is due to the increase in dangerous dazzle attacks caused by high-power laser pointers. In addition to pilots, these include truck and car drivers, train operators, soccer players, referees, and even spectators at soccer games.
Dehydroalanine is an organic compound with the formula CH2=CH(NH2)CO2H. It does not exist in its free form, but it occurs naturally as a residue found in peptides of microbial origin. Unlike most amino acid residues, it has an unsaturated backbone.
Sources: en.wikipedia.org
==== Absorption and distribution ==== Fomepizole distributes rapidly into total body water. The volume of distribution is between 0.6 and 1.02 L/kg. The therapeutic concentration is from 8.2 to 24.6 mg (100 to 300 micromoles) per liter. Peak concentration following single oral doses of 7 to 50 mg/kg of body weight occurred in 1 to 2 hours. The half-life varies with dose, so has not been calculated.
All Danish citizens above 18 years of age can apply for some financial support if they cannot support themselves or their family. Approval is not automatic, and the extent of this system has generally been diminished since the 1980s. Sick people can receive some financial support throughout the extent of their illness. Their ability to work will be re-evaluated by the municipality after 5 months of illness. The welfare system related to the labor market has experienced several reforms and financial cuts since the late 1990s due to political agendas for increasing the labor supply. Several reforms of the rights of the unemployed have followed up, partially inspired by the Danish Economic Council. Halving the time unemployment benefits can be received from four to two years, and making it twice as hard to regain this right, was implemented in 2010 for example. Disabled people can apply for permanent social pensions. The extent of the support depends on the ability to work, and people below 40 are not eligible unless deemed incapable of any kind of work.
The CCC separation process can be thought of as occurring in three stages: mixing, settling, and separation of the two phases (although they often occur continuously). Vigorous mixing of the phases is critical in order to maximize the interfacial area between them and enhance mass transfer. The analyte will distribute between the phases according to its partition coefficient which is also called the distribution coefficient, distribution constant, or partition ratio and is represented by P, K, D, Kc, or KD. The partition coefficient for an analyte in a particular biphasic solvent system is independent of the volume of the instrument, flow rate, stationary phase retention volume ratio and the g-force required to immobilize the stationary phase. The degree of stationary phase retention is a crucial parameter. Common factors that influence stationary phase retention are flow rate, solvent composition of the biphasic solvent system, and the g-force. The stationary phase retention is represented by the stationary phase volume retention ratio (Sf) which is the volume of the stationary phase divided by the total volume of the instrument. The settling time is a property of the solvent system and the sample matrix, both of which greatly influence stationary phase retention. To most process chemists, the term "countercurrent" implies two immiscible liquids moving in opposing directions, as typically occurs in large centrifugal extractor units.
In 2009 they showed that the same simple building blocks allow access, via phosphate controlled nucleobase elaboration, to 2',3'-cyclic pyrimidine nucleotides directly, which can polymerize into RNA. Similar photo-sanitization can create pyrimidine-2',3'-cyclic phosphates.
==== President Obama's proposals ==== President Obama announced a 10-year (2012–2021) plan in September 2011 called: "Living Within Our Means and Investing in the Future: The President's Plan for Economic Growth and Deficit Reduction." The plan included tax increases on the wealthy, along with cuts in future spending on defense and Medicare. Social Security was excluded from the plan. The plan included a net debt avoidance of $3.2 trillion over 10 years. If the Budget Control Act of 2011 is included, this adds another $1.2 trillion in deficit reduction for a total of $4.4 trillion. The Bipartisan Policy Center (BPC) evaluated the President's 2012 budget against several alternate proposals, reporting it had revenues relative to GDP similar to the Domenici-Rivlin and Bowles-Simpson expert panel recommendations but slightly higher spending. President Obama proposed during July 2012 allowing the Bush tax cuts to expire for individual taxpayers earning over $200,000 and couples earning over $250,000, which represents the top 2% of income earners. Reverting to Clinton-era tax rates for these taxpayers would mean increases in the top rates to 36% and 39.6% from 33% and 35%. This would raise approximately $850 billion in revenue over a decade. It would also mean raising the tax rate on investment income, which is highly concentrated among the wealthy, to 20% from 15%.
Sources: en.wikipedia.org
The peptide contains four residues in the order alanine, glutamate, aspartate and glycine, abbreviated AEDG. The chain is linear and held together by three peptide bonds. Its calculated mass for the uncharged free form is about 390.3 daltons.
Epithalamin refers to a crude preparation derived from bovine pineal tissue, which contains many components. Epitalon is a single synthetic tetrapeptide identified from that material and produced by chemical synthesis. The two names are sometimes confused because early reports treated the synthetic peptide as an active fragment of the extract.
It has been registered for clinical use in Russia, where it is associated with a small family of short peptides. In most other jurisdictions it is not an approved medicine and is traded as a research chemical. Regulatory status varies by country and changes over time.
The usual approach is reversed-phase HPLC with ultraviolet detection, reported as a percentage of total peak area. Mass spectrometry is used alongside chromatography to confirm identity rather than purity alone.