The short version of analytical standard fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-02-17 and is reviewed periodically as new material appears.
SR9009 is a synthetic small molecule studied as an agonist of REV-ERB nuclear receptors. REV-ERB alpha and REV-ERB beta help regulate circadian rhythms and metabolic gene expression. In laboratory research, SR9009 has been used to probe how these receptors affect skeletal muscle, liver, and adipose tissue. The compound was identified in academic drug-discovery work and is often described in scientific literature by its chemical name and research code. It is not an approved medicine, and human clinical data remain limited or absent.
SR9009 binds REV-ERB receptors and alters their repressive activity on target genes. This action can change transcription of genes involved in lipid handling, glucose metabolism, and mitochondrial function. In rodent studies, treated animals have shown changes in muscle oxidative capacity and exercise performance, though effects vary by dose, duration, and model. The precise molecular steps connecting receptor binding to whole-body outcomes are still an active area of investigation. Findings in animals do not automatically translate to humans.
Because REV-ERB receptors are core clock components, SR9009 has been examined for effects on daily rhythms as well as metabolism. Research has explored whether the compound can shift or reinforce circadian gene expression in tissues such as liver and muscle. Some studies report improved metabolic markers in obese or diabetic mice, while others show context-dependent responses. Questions remain about which effects are direct, which are secondary to timing, and how they might differ across species.
Mechanistically, SR9009 binds the ligand-binding domain of REV-ERBα/β and enhances recruitment of corepressor complexes. This represses target genes rather than activating them. Because REV-ERB proteins normally compete with ROR proteins at shared response elements, the net effect depends on tissue and timing. Researchers use SR9009 to probe how nuclear receptor signaling links the clock to metabolism, inflammation, and muscle biology. Findings are largely preclinical, and the precise contribution of each receptor subtype remains under study.
SR9009 is frequently discussed in fitness and research-chemical contexts, yet it has no approved medical indication. Regulatory agencies have not authorized it for human use, and it is not a standard prescription drug. Some sports organizations list it as a prohibited substance because of its potential performance-enhancing properties. Published human data are sparse, so claims about its effects in people often rely on animal models or anecdotal reports. Quality and identity of online materials can vary widely.
SR9009 is a synthetic small molecule studied as a REV-ERB agonist. REV-ERBα and REV-ERBβ are nuclear receptors that help regulate circadian rhythms and metabolic gene expression. The compound was identified in academic screening efforts to find synthetic ligands for these receptors. In cell and animal studies, SR9009 alters transcription of genes involved in lipid and glucose metabolism, and it can shift circadian behavior. It is not an approved therapeutic agent.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic REV-ERB agonist | Small-molecule nuclear receptor ligand |
| Appearance | Off-white to pale yellow solid | Typical for research-grade powder |
| Solubility class | Soluble in DMSO; low water solubility | Common stock solutions use organic solvent |
| Typical stock solvent | Dimethyl sulfoxide | Used for laboratory assays |
| Common analytical method | HPLC with UV or mass detection | Used for identity and purity checks |
Regulatory treatment of SR9009 varies by country and region. It is not approved as a pharmaceutical, and several jurisdictions restrict its sale for human consumption. Some authorities classify it as a research chemical, a prescription-only substance, or a prohibited performance-enhancing agent in sport. Purchasers may encounter certificates of analysis, but these documents do not guarantee identity, purity, or legality. In research settings, institutional safety reviews and controlled procurement help ensure that materials are handled under appropriate oversight. The absence of harmonized rules means that legal status can change and requires verification.
Analytical identification of SR9009 typically relies on liquid chromatography coupled with tandem mass spectrometry. In biological samples, researchers first separate the compound from matrix components using protein precipitation, liquid-liquid extraction, or solid-phase extraction. High-performance liquid chromatography with ultraviolet detection and nuclear magnetic resonance spectroscopy can support structural confirmation of reference materials. Because SR9009 is a small, relatively lipophilic molecule, reverse-phase columns and acidic mobile phases are common. Laboratories often include isotope-labeled internal standards to improve quantification and to correct for ion suppression.
Stability depends on physical form, temperature, light exposure, and solvent. Solid SR9009 is generally stored cold and dry, with protection from light to limit degradation. Dimethyl sulfoxide stocks are common for laboratory work, but repeated freeze-thaw cycles can reduce compound integrity. Aqueous solutions may be less stable than organic stocks, and the ethyl ester in the structure can be susceptible to hydrolysis under certain conditions. Researchers typically validate storage conditions and recheck purity before quantitative experiments, especially when using archived material.
Handling practices for SR9009 focus on minimizing degradation and contamination. The solid is generally stored desiccated at or below -20 °C, protected from light and moisture. Stock solutions are often prepared in dimethyl sulfoxide or ethanol, then aliquoted to avoid repeated freeze–thaw cycles. Aqueous solubility is low, so formulations for animal studies may require cosolvents or suspending agents. Personnel should follow institutional chemical safety procedures, because toxicological data for humans are incomplete.
Regulatory status varies by country and intended use. Major drug agencies have not granted marketing authorization for SR9009 as a medicine, and it is not listed as a controlled substance in many jurisdictions. It is often sold as a research chemical, a category that may fall outside pharmaceutical manufacturing rules. Buyers should verify local laws and supplier documentation, including certificates of analysis. The lack of standardized quality controls raises concerns about identity, purity, and actual content in products marketed online.
Small integral membrane protein 20 (SMIM20) is a protein that in humans is encoded by the SMIM20 gene. SMIM20 acts as a prohormone to the peptide hormone phoenixin (PNX) which was discovered for the first time in 2013 in rodent sensory ganglia. Two alternate cleavage sites within SMIM20 results in two different phoenixin products, Phoenixin-14 (PNX-14) and Phoenixin-20 (PNX-20). In the study of the evolution of nervous systems, SMIM20 together with NUCB2 have been found to have deep homology across all lineages that preceded creatures with central nervous systems, bilaterians, cnidarians, ctenophores, and sponges as well as in choanoflagellates.
The share of the world's lead production by the Eastern Bloc increased from 10% to 30%, from 1950 to 1990, with the Soviet Union being the world's largest producer during the mid-1970s and the 1980s, and China starting major lead production in the late 20th century. Unlike the European communist countries, China was largely unindustrialized by the mid-20th century; in 2004, China surpassed Australia as the largest producer of lead. As was the case during European industrialization, lead has had a negative effect on health in China.
=== United Kingdom === Beak trimming is legal but regulated in the UK; it is expected that the practice will be prohibited in the near future. In 2011, the British government set up the Beak Trimming Action Group (BTAG) to review the matter with representatives from different stakeholders, including the industry, the government, animal welfare groups and veterinarians. A late 2015 BTAG report endorsed by Farming Minister George Eustice concluded that banning it in January 2016 would be too early as the sector needed more time to change its management techniques in order to avoid feather pecking, but that beak trimming should be phased out in the future. Laying Hen Welfare Forum chairman Andrew Joret stated in March 2020: 'A ban is coming. In my opinion, we have five years at most to prepare for this. We need to work out ways of keeping birds well-feathered, and if we can, eventually do that without beak trimming.'
== Contraindications == Emedastine should not be used in patients who are hypersensitive to emedastine or any other excipients of the preparation. Benzalkonium chloride contained in the bottle of emedastine solution can discolor soft contact lenses, so people who wear contact lenses should be careful using it.
Sources: en.wikipedia.org
=== Sequencing === DNA sequencing determines the order of nucleotide bases in a DNA molecule. Synthetic biologists use DNA sequencing in their work in several ways. First, large-scale genome sequencing efforts continue to provide information on naturally occurring organisms. This information provides a rich substrate from which synthetic biologists can construct parts and devices. Second, sequencing can verify that the fabricated system is as intended. Third, fast, cheap, and reliable sequencing can facilitate rapid detection and identification of synthetic systems and organisms.
P. porrigens was once generally regarded as edible, though bland. As of 2011, it is a suspect in two outbreaks in Japan involving fatal encephalopathy. Most victims had preexisting kidney disorders. The first incident occurred in September and October 2004 across nine prefectures in Japan, documenting the sickening of 59 people and the eventual death of 17. Most of those who died had preexisting liver problems and the average age of those affected was 70. Death occurred between 13 and 29 days after the onset of symptoms, which occurred at most three weeks after consumption of the species. The second incident occurred in 2009, when a 65-year-old man who had been on hemodialysis died from acute encephalopathy after eating P. porrigens. The mechanism of action for the toxicity of P. porrigens has not been definitively established, but several possibilities have been suggested. It has been demonstrated that P. porrigens contains an unusual amino acid, Pleurocybellaziridin, which is toxic to the brain cells of rats in cell culture studies, but it has not yet been possible to definitively determine that this was the cause of the fatal encephalopathies. Other mechanisms have been suggested for P. porrigens's apparent toxicity, including the possibility that the fungus may contain toxic levels of cyanide salts. A proposed mechanism of action for the toxicity of P. porrigens has been proposed by Kawagishi, et al.
=== Fluorescent tags === Hexahistadine CyDye tags have been developed, which use nickel covalent coordination to EDTA groups attached to fluorophores in order to create dyes that attach to the polyhistidine tag. This technique has been shown to be useful for following protein migration and trafficking and may be effective for measuring distance via Förster resonance energy transfer.
Elizabeth Murphy Topp is an American pharmaceutical scientist and educator known for her work in solid‐state chemical stability of proteins and peptides. In 2000s Topp introduced solid-state hydrogen-deuterium exchange as the method for stability characterization of lyophilized biopharmaceutical formulations. She is the Chief Scientific Officer at National Institute of Bioprocessing Research and Training (NIBRT) in Dublin, Ireland since September 2019. Topp was on the faculty at the University of Kansas Department of Pharmaceutical Chemistry from 1986 to 2009. She has been the Head and Dane O. Kildsig Chair at the Department of Industrial and Physical Chemistry at Purdue University College of Pharmacy from 2009 to 2017. Topp has been elected a fellow of American Association of Pharmaceutical Scientists in 2010 for "making sustained remarkable scholarly and research contributions to the pharmaceutical sciences". In 2015 Topp co-founded, with Alina Alexeenko, an industry-university consortium LyoHUB for advancing pharmaceutical lyophilization technology. Topp earned her B.S. in Chemical Engineering form the University of Delaware, M.E. in Chemical and Biochemical Engineering from the University of Pennsylvania and a Ph.D. in Pharmaceutics from University of Michigan.
Kombucha can be prepared at home or commercially. It is made by dissolving sugar in non-chlorinated boiling water. Tea leaves are then steeped in the hot sugar water and discarded. The sweetened tea is cooled and the SCOBY culture is added. The mixture is then poured into a sterilized beaker along with previously fermented kombucha tea to lower the pH. This technique is known as "backslopping". The container is covered with a paper towel or breathable fabric to prevent insects, such as fruit flies, from contaminating the kombucha. The tea is left to ferment for a period of up to 10 to 14 days at room temperature, 18–26 °C (64–79 °F). A new "daughter" SCOBY will form on the surface of the tea to the diameter of the container. After fermentation is completed, the SCOBY is removed and stored along with a small amount of the newly fermented tea. The remaining kombucha is strained and bottled for a secondary ferment for a few days or stored at 4 °C (39 °F).
Sources: en.wikipedia.org
Factor VIII was first characterized in 1984 by scientists at Genentech. The gene for factor VIII is located on the X chromosome (Xq28). The gene for factor VIII presents an interesting primary structure, as another gene (F8A1) is embedded in one of its introns.
=== Pregnancy === In pregnancy, the vulva and vagina take on a bluish coloring due to venous congestion. This appears between the eighth and twelfth week and continues to darken as the pregnancy continues. Estrogen is produced in large quantities during pregnancy and this causes the vulva to become enlarged. The vaginal opening and the vagina are also enlarged. After childbirth, a vaginal discharge known as lochia is produced and continues for about ten days.
=== Part II: Principles guiding foreign policy === This section briefly affirms the TGE's authority to "abide by all mutual agreements that respect the sovereignty of Ethiopia and are not contrary to the interests of the People." In addition, it grants subnational governments the right to form their own relationships with foreign organizations if it is for the purpose of humanitarian or relief efforts.
In the view of UCC, "the ruling reaffirms UCC's long-held positions and finally puts to rest—both procedurally and substantively—the issues raised in the class action complaint first filed against Union Carbide in 1999 by Haseena Bi and several organisations representing the residents of Bhopal". In June 2010, seven former employees of UCIL, all Indian nationals and many in their 70s, were convicted of causing death by negligence: Keshub Mahindra, former non-executive chairman of Union Carbide India Limited; V. P. Gokhale, managing director; Kishore Kamdar, vice-president; J. Mukund, works manager; S. P. Choudhary, production manager; K. V. Shetty, plant superintendent; and S. I. Qureshi, production assistant. They were each sentenced to two years' imprisonment and fined ₹100,000 (equivalent to ₹240,000 or US$2,500 in 2026). All were released on bail shortly after the verdict. A US federal class action litigation, Sahu v. Union Carbide and Warren Anderson, was filed in 1999 under the U.S. Alien Torts Claims Act (ATCA), which provides for civil remedies for "crimes against humanity". It sought damages for personal injury, medical monitoring and injunctive relief in the form of clean-up of the drinking water supplies for residential areas near the Bhopal plant. The lawsuit was dismissed in 2012 and the subsequent appeal was denied. Warren Anderson, then 92 years old, died on 29 September 2014. On 14 March 2023, Indian Supreme Court dismissed curative petition for enhanced compensation.
Sources: en.wikipedia.org
SR9009 is a synthetic research compound that acts on REV-ERB nuclear receptors. It is not approved for human use and is sold only as a research chemical. Its effects have been studied mainly in cells and rodents.
It binds REV-ERB alpha and REV-ERB beta and changes the expression of genes tied to metabolism and circadian rhythm. These changes can affect mitochondria and energy use in animal models. The exact chain from receptor binding to physiological outcome is still being mapped.
No reliable human trials show that SR9009 improves athletic performance. Some rodent studies report endurance changes, but these results are not proof of human benefit. Its use in sport is prohibited, and quality and safety data are lacking.
SR9009 is a synthetic compound investigated as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. It is used in preclinical research on circadian rhythm and metabolism. It is not an approved drug.