reference standard is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2025-12-15. Numbers and descriptions here follow the published literature rather than marketing material.
In rodent studies, SR9009 has been reported to increase mitochondrial content in skeletal muscle and improve exercise endurance under some conditions. These findings led to popular descriptions such as an exercise mimetic, although that term oversimplifies the biology. Effects vary by dose, timing, tissue, and model. The compound's influence on circadian pathways means that time of administration can matter in experiments. Whether similar metabolic changes occur in humans remains largely unexplored in controlled published trials.
Pharmacokinetic data for SR9009 are limited in published literature. Some reports indicate low oral bioavailability and rapid clearance in animals, which complicates interpretation of exposure and effect. Researchers often use injected routes in preclinical work to achieve measurable systemic levels. Analytical studies rely on mass spectrometry to detect the parent compound and its metabolites. Questions about tissue distribution, active metabolites, and long-term consequences remain open. Species differences in metabolism can affect observed half-life and target engagement.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. These receptors help regulate circadian rhythms and metabolic gene expression. In laboratory experiments, SR9009 binds these receptors and alters transcription of genes involved in lipid handling, glucose metabolism, and mitochondrial function. It is not a naturally occurring compound and has no approved therapeutic use. Research interest stems from its ability to modify energy metabolism in cells and animal models.
The mechanism of action involves binding to REV-ERB receptors and recruiting corepressor complexes, which represses target gene transcription. This contrasts with many nuclear receptor agonists that activate transcription. Downstream effects may include changes in autophagy, mitochondrial biogenesis, and lipid handling, but the precise pathways remain an active area of study. Whether these molecular events translate into meaningful physiological effects in humans is unresolved. Most evidence comes from cultured cells and rodent models rather than human participants.
SR9009 is a synthetic small molecule developed as an agonist of the nuclear receptors REV-ERBα (NR1D1) and REV-ERBβ (NR1D2). These receptors help regulate circadian rhythms and metabolic gene expression. In cell and animal studies, SR9009 alters transcription of genes involved in lipid metabolism, inflammation, and mitochondrial function. It is not an approved medicine, and its pharmacological profile in humans remains largely uncharacterized. The compound is frequently discussed in the context of circadian biology and metabolic research rather than clinical use.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic small-molecule REV-ERB agonist | Not a hormone or natural product |
| Primary targets | REV-ERBα and REV-ERBβ | Nuclear receptors involved in circadian and metabolic regulation |
| Appearance | White to off-white solid | Typical for purified research samples |
| Solubility | Soluble in DMSO and ethanol; low water solubility | Laboratory solubility depends on solvent and purity |
| Common synonyms | SR9009; Stenabolic | Stenabolic is a colloquial name, not a formal chemical name |
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.
Detection in biological samples can be complicated by rapid metabolism and low circulating concentrations. Some studies report phase I and phase II metabolites, and analytical methods may need to target those species in addition to the parent compound. Immunoassays are not broadly available, so mass spectrometry remains the main confirmatory approach. For anti-doping testing, laboratories look for SR9009 and its metabolites using validated LC-MS methods. Open questions include how long metabolites remain detectable and how different routes of administration alter detection windows.
In laboratory settings, SR9009 is typically characterized by liquid chromatography–mass spectrometry (LC-MS) or high-performance liquid chromatography with ultraviolet detection (HPLC-UV). These methods can confirm identity and estimate purity, but they require reference standards for accurate quantification. Because SR9009 is not a licensed pharmaceutical, no harmonized pharmacopeial monograph exists. Laboratories often validate in-house methods for matrices such as plasma, urine, or cell culture media. Sample preparation may involve protein precipitation or liquid-liquid extraction before analysis.
Physicochemical behavior influences handling. SR9009 is described as a solid with limited aqueous solubility, so organic solvents such as dimethyl sulfoxide or ethanol are common in research stock solutions. Aqueous dilution can produce precipitates if the organic content is too low. Light, heat, and repeated freeze-thaw cycles may affect stability. Storage recommendations usually specify a desiccated freezer environment protected from light, but exact stability data depend on the formulation and matrix.
Regulatory treatment of SR9009 varies by country and context. It is not approved as a therapeutic drug by agencies such as the United States Food and Drug Administration or the European Medicines Agency. Sports authorities list it as a prohibited substance; the World Anti-Doping Agency classifies it among hormone and metabolic modulators. Legal status for personal possession or sale differs across jurisdictions, and some countries may restrict it under analog or research chemical laws. Buyers who seek verified material often rely on independent laboratory testing because online product labels may not match contents.
Laboratory samples of SR9009 are typically handled as research chemicals rather than pharmaceuticals. Suppliers usually state that the material is for research use only and not for human or veterinary administration. Storage recommendations generally call for a freezer at approximately −20 °C, protection from light, and a desiccated environment. The solid is often described as a white to off-white powder. Solubility is commonly reported in organic solvents such as dimethyl sulfoxide and ethanol, with low solubility in water.
Analytical identification and purity assessment often use high-performance liquid chromatography with ultraviolet detection or mass spectrometry. Liquid chromatography–tandem mass spectrometry is used to detect and quantify SR9009 in biological matrices, including urine and blood, for anti-doping or pharmacokinetic studies. Nuclear magnetic resonance spectroscopy can confirm molecular structure. Stability depends on form and storage: the solid is generally more stable than solutions, and repeated freeze–thaw cycles may degrade samples. Purity is typically reported as a percentage from a certificate of analysis.
Research interest in SR9009 grew from studies of circadian biology and metabolic disease. Preclinical reports describe effects on exercise capacity, muscle metabolism, and blood lipid levels in rodents, but these findings come from controlled laboratory settings. The compound has low oral bioavailability in animals, which limits systemic exposure after swallowing. Investigators often use injected routes in experiments to achieve measurable plasma concentrations. Human clinical data are sparse, no approved therapeutic product exists, and whether animal effects translate to humans remains an open question.
Regulatory and sporting contexts treat SR9009 as a prohibited substance in many elite competitions. Its presence on banned lists reflects concerns about performance enhancement and unknown long-term safety. Analytical chemists have developed methods to detect the parent compound and its metabolites in urine and blood. Literature discussions distinguish between in vitro potency, animal pharmacology, and anecdotal human reports. The latter are difficult to verify because products sold online may lack purity or contain different compounds.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. These receptors help regulate circadian rhythms, lipid metabolism, and inflammatory gene expression. In cell and animal experiments, SR9009 alters transcription of clock-controlled genes and metabolic pathways. The compound is not a hormone and does not resemble classical steroid structures. Its activity depends on binding to the ligand-binding domain of REV-ERB, where it can modify corepressor recruitment.
==== 1200–1299 ==== Export of Goods (Control) (Bosnia-Herzegovina) (ECSC) (Revocation) Order 1993 (S.I. 1993/1200) Scrabster Harbour Revision Order 1993 (S.I. 1993/1201) Road Traffic (Parking Adjudicators) (London) Regulations 1993 (S.I. 1993/1202) Lancashire and Merseyside (County Boundaries) Order 1993 (S.I. 1993/1206) Bromley, Croydon, Lambeth, Lewisham and Southwark (London Borough Boundaries) Order 1993 (S.I. 1993/1207) Greater London and Surrey (County and London Borough Boundaries) (No. 2) Order 1993 (S.I. 1993/1208) Medway Ports Authority (Dissolution) Order 1993 (S.I. 1993/1209) Environmentally Sensitive Areas (Ynys Môn) Designation Order 19930 S.I. 1993/1210) Environmentally Sensitive Areas (Radnor) Designation Order 1993 (S.I. 1993/1211) Cod (Irish Sea) (Prohibition of Fishing) Order 1993 (S.I. 1993/1212) Merchant Shipping (Local Passenger Vessels)(Masters' Licences and Hours, Manning and Training) Regulations 1993 (S.I. 1993/1213) Education (Student Loans) Regulations 1993 (S.I. 1993/1214) Act of Sederunt (Solicitor's Right of Audience) 1993 (S.I. 1993/1215) Essex and Greater London (County and London Borough Boundaries) (No.2) Order 1993 (S.I. 1993/1218) Income Support (General) Amendment (No. 2) Regulations 1993 (S.I. 1993/1219) A27 Trunk Road (Polegate Bypass) Order 1993 (S.I. 1993/1220) Motor Vehicles (EC Type Approval) (Amendment) Regulations 1993 (S.I. 1993/1221) Value Added Tax (Repayments to Third Country Traders) (Amendment) Regulations 1993 (S.I. 1993/1222) Value Added Tax (Repayment to Community Traders) (Amendment) Regulations 1993 (S.I.
==== First scientific synthetic dye: picric acid ==== The first synthetic dye was picric acid. It was prepared in a laboratory in 1771, and commercially produced by M. Guinon in Lyon in 1845. It dyed silk fabric yellow; however the color fastness properties were not good, thus it had very limited commercial success. It was, however, purchased in limited amounts by French dyers.
Kyren Wilson wins the 2024 World Snooker Championship, defeating Jak Jones 18 frames to 14. 7 May Farmers call for a vaccine to be developed against bluetongue disease after 126 cases are reported in cattle and sheep, spread by infected midges blown from northern Europe. China is suspected of hacking the UK armed forces payroll. The Green Party's Siân Berry, who was re-elected in the 2024 London Assembly election, is criticised for resigning three days later to hand her seat to Zoë Garbett, who lost in the same election with 5.8% of the vote. Berry steps down from the post in order to run as Green candidate in Brighton Pavilion, where current MP Caroline Lucas is standing down at the next election. 8 May John Swinney is sworn in as Scotland's seventh first minister at a ceremony at the Court of Session in Edinburgh. Swinney appoints Kate Forbes as Scotland's Deputy First Minister. Natalie Elphicke, MP for Dover, defects from the Conservatives to Labour as Prime Minister's Questions begins in the Commons, saying in a statement: "Under Rishi Sunak, the Conservatives have become a byword for incompetence and division." Former cricketer Monty Panesar of the Workers Party, withdraws his candidacy to stand for election as the next MP for Ealing Southall in the 2024 general election as he needs more time to "mature and find my political feet". 9 May The Bank of England keeps interest rates on hold at 5.25% for the sixth time in a row. The governor Andrew Bailey says the committee needs to "see more evidence" of falling inflation before cutting the base rate.
==== Psychedelics ==== The Zendo Project conducted by the Multidisciplinary Association for Psychedelic Studies uses principles from psychedelic therapy to provide safe places and emotional support for people having difficult experiences on psychedelic drugs at select festivals such as Burning Man, Boom Festival, and Lightning in a Bottle without medical or law enforcement intervention.
Since their construction and decoration between the 4th and 8th centuries CE, the Kizil Caves have suffered numerous periods of religious vandalism and decay. Western archaeologists orchestrated the massive sampling on the best remaining works of art in the early 20th century. Aside from their colonial outlook, one of their alleged motivations was to protect these works of arts from vandalism due to Islamic iconoclasm and the depredations of treasure hunters. Most of the dismantled panels were sent to the Museum für Indische Kunst, Berlin, Germany, but many were destroyed in World War II, with only photographs or drawings remaining in the best cases. A significant number of the murals were also captured by the Soviets in Berlin, and turned up recently in the Hermitage Museum. In more recent times, the Red Guards also contributed to the destruction of the site, and last but not least, the transformation of the site for touristic purposes since 2005 has led to the disfigurement of many caves and the irretrievable loss of archaeological knowledge. Today, none of the caves can be said to have remained entirely intact, although many remain quite impressive.
Sources: en.wikipedia.org
== Methods used == Whistleblowers who may be at risk from those they are exposing are now using encryption methods and anonymous content-sharing software to protect their identity. Tor, a highly accessible anonymity network, is frequently used by whistleblowers around the world. Tor has undergone several large security updates to protect the identities of potential whistleblowers who may wish to leak information anonymously. Specialized whistleblowing software has been built on top of the Tor technology to incentivize and simplify its adoption for secure whistleblowing. Considering the risks faced by whistleblowers, most whistleblowing software has been developed as open-source projects, allowing for public audits and transparency. Built on well-defined design principles, examples include GlobaLeaks and SecureDrop.
“Chemoinformatics and Molecular Simulation”; “Chemistry of Supramolecular Nano- and Biosystems”; “Methods of Analytical Chemistry”; “Physical-Chemical Methods in Chemistry”; “Petrochemistry and Catalysis”. Total number of students taking Bachelor, Specialist and master's degree programs is 472 (as of January, 2016).Departments of the Institute of Chemistry educate postgraduates in the following majors: 02.00.01 – Inorganic Chemistry; 02.00.02 – Analytical Chemistry; 02.00.03 – Organic Chemistry; 02.00.04 – Physical Chemistry; 02.00.08 – Chemistry of Organoelement Compounds. There are two dissertation councils functioning in the Institute of Chemistry for thesis defence in chemical sciences: Д 212.081.03 under the Federal State Autonomous Institution of Higher Education “Kazan (Volga Region) Federal University”; majors allowed for defence: 02.00.01 – Inorganic Chemistry; 02.00.08 – Chemistry of Organoelement Compounds; Chairman of the Council is Professor Vladimir I. Galkin, Doctor of Chemistry;
Fermium was first discovered in the fallout from the 'Ivy Mike' nuclear test (1 November 1952), the first successful test of a hydrogen bomb. Initial examination of the debris from the explosion had shown the production of a new isotope of plutonium, 244Pu: this could only have formed by the absorption of six neutrons by a uranium-238 nucleus followed by two β− decays. At the time, the absorption of neutrons by a heavy nucleus was thought to be a rare process, but the identification of 244Pu raised the possibility that still more neutrons could have been absorbed by the uranium nuclei, leading to new elements. Element 99 (einsteinium) was quickly discovered on filter papers which had been flown through clouds from the explosion (the same sampling technique that had been used to discover 244Pu). It was then identified in December 1952 by Albert Ghiorso and co-workers at the University of California at Berkeley. They discovered the isotope 253Es (half-life 20.5 d) that was made by the capture of 15 neutrons by uranium-238 nuclei – which then underwent seven successive beta decays:
Promising innovations relating to global challenges are reported: researchers release an AI system, SIDE, to improve source-quality and reliability of Wikipedia by identifying problematic citations and recommending better ones to editors (19 Oct), researchers demonstrate potential AI applications in science such as for research suggestion tools and keeping track of accelerating scientific output. Promising results of health and medical research are reported: breast-cancer detection via cell-free tumor DNA in breastmilk (5 Oct), monkey-tested genetically edited humanized kidney xenotransplant (11 Oct), trialed electrical brain stimulation methods against brain disorders (19 Oct), aged-rats tested blood plasma fraction E5 from young pig blood against aging as measured by cognitive function and organ biomarkers (24 Oct).
There are other applications of this method where the PdII complexes were generated as PdII-peptide OACs by introducing 4-halophenylalanine into peptides during SPPS to achieve peptide-peptide or peptide-protein ligation.
Sources: en.wikipedia.org
Either form may be quoted. Intuitively, the above quantities indicate this represents the flow of probability. The chance of finding the particle at some position r and time t flows like a fluid; hence the term probability current, a vector field. The particle itself does not flow deterministically in this vector field.
Fungal infections; Pneumocystis jiroveci, histoplasmosis, coccidioidomycosis, paracoccidioidomycosis, candidiasis Other granulomatous conditions; PR3+ vasculitis, Crohn's disease, acute granulomatous pneumonia, talc granuloma, silicone-induced granuloma, BCG-associated, granulomatous hepatitis, paraffin-associated granuloma Genetic conditions; Williams syndrome, pseudoxanthoma elasticum, CYP24A1 mutation (adult / infantile), SLC34A1 mutation Miscellaneous; mycobacterium avium, leprosy, lipoid pneumonia, cat scratch fever, berylliosis Some plants contain glycosides of 1,25-dihydroxycholecalciferol. Consumption of these glycosides by grazing animals leads to vitamin D toxicity, resulting in calcinosis, the deposition of excessive calcium in soft tissues. Three rangeland plants, Cestrum diurnum, Solanum malacoxylon, and Trisetum flavescens, are known to contain these glycosides. Of these, only C. diurnum is found in the U.S., mainly in Florida.
Prescriber education guidelines as well as patient education, prescription drug monitoring programs and regulation of pain clinics are regulatory tactics which have been used to curtail opioid use and misuse.
Sporulation is stimulated by amino acids (except L-valine) when grown in light, while in darkness only L-tryptophan and L-methionine effect stimulation of growth. The columellae are globose, subglobose, or oval in shape. The wall is usually smooth and the colour is pale brown. The average diameter growth ranges from 30-110 μm. Sporangiospores are elliptical, globose, or polygonal, they are striated and grow 5-8 μm in length. Dormant and germinated sporangiospores show deep furrows and prominent ridges with a pattern that makes it distinguishable from that of R. stolonifer. The germination of sporangiospores can be induced by the combined action of L-proline and phosphate ions. L-ornithine, L-arginine, D-glucose and D-mannose are also effective. Optimal germination occurs on media containing D-glucose and mineral salts.R. oryzae has abundant, root-shaped rhizoids. Zygospores are produced by diploid cells when sexual reproduction occurs under nutrient poor conditions. They have colors that range from red to brown, they are spherical or laterally flattened, and ranges from 60-140μm in size. In high nutrient levels, R. oryzae reproduces asexually, producing azygospores. The stolons found in R. oryzae are smooth or slightly rough, almost colorless or pale brown, 5-18 μm in diameter. The chlamydospores are abundant, globose ranging in 10-24 μm in diameter, elliptical, and cylindrical. Colonies of R. oryzae are white initially, becoming brownish with age and can grow to about 1 cm thick.
== Public listing, financials and governance == TCI is listed on Taiwan's OTC market (stock code 8436). Regulatory and investor pages report the company's registration details, public offering timeline (public offering 25 August 2011; OTC listing 12 September 2013), paid-in capital and disclosure contacts. Quarterly and annual reports are published on the company's investor relations pages.
Sources: en.wikipedia.org
It is a synthetic research compound that activates REV-ERB nuclear receptors. It is not an approved drug or dietary supplement. Most information comes from cell and animal studies.
It binds REV-ERBα and REV-ERBβ and changes transcription of metabolic genes. This can affect circadian rhythm, lipid use, and mitochondrial function. The full downstream effects are still under study.
No. Some rodent studies show increased endurance, but controlled human trials are lacking. Claims about human performance are not established by published evidence.
It is a synthetic compound that acts as an agonist at REV-ERBα and REV-ERBβ. It is used mainly as a research chemical to study circadian and metabolic pathways. It is not approved for human therapeutic use.