nuclear receptor 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 2026-01-03. Numbers and descriptions here follow the published literature rather than marketing material.
In laboratory settings, SR9009 is commonly identified by its molecular structure and its interaction with REV-ERB receptors. Vendors may list it under synonyms such as Stenabolic or REV-ERB agonist, but those names do not define purity or identity. Analytical confirmation typically uses high-performance liquid chromatography with ultraviolet detection or liquid chromatography–mass spectrometry. A reference standard is needed to compare retention time and mass spectrum, because the compound can be confused with related research chemicals.
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.
Storage recommendations for SR9009 reference material typically specify a freezer at -20 °C or lower, with protection from moisture and light. Repeated freeze-thaw cycles can degrade small molecules and introduce variability. Stock solutions in dimethyl sulfoxide are often aliquoted to avoid repeated handling. Stability studies may examine degradation under heat, humidity, and light exposure. The compound's thiophene and nitro groups can participate in reactions that alter analytical signals over time, so such changes affect quantitative results.
Quality control for research materials includes identity confirmation by nuclear magnetic resonance and purity assessment by high-performance liquid chromatography. Mass spectrometry provides molecular weight confirmation and can detect related impurities. Purchasers should request a certificate of analysis that lists lot-specific data. Online products advertised for human use often lack such documentation. Distinguishing legitimate research material from mislabeled or contaminated samples is a recurring challenge in independent testing, and independent laboratories may use orthogonal methods to verify identity.
Detection of SR9009 in biological samples usually relies on liquid chromatography coupled to tandem mass spectrometry. This approach separates the compound from matrix components and identifies it by mass transitions. Because SR9009 can undergo metabolism, laboratories often look for both parent drug and specific metabolites. Sample preparation may involve protein precipitation or solid-phase extraction. Method validation examines sensitivity, carryover, and interference from related substances, and reference standards are required for accurate calibration.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white solid | Visual inspection is not sufficient for identity. |
| Solubility | Soluble in DMSO and ethanol | Low solubility in water. |
| Typical storage | -20 °C, desiccated, dark | Protect from repeated temperature changes. |
| Common analytical method | LC-MS or HPLC-UV | Reference standard required for comparison. |
| Common synonyms | SR9009; Stenabolic; REV-ERB agonist | Vendor naming may vary. |
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.
Preclinical reports have linked SR9009 to improved endurance and altered energy expenditure in rodents. Such findings have prompted interest in whether REV-ERB activation can influence skeletal muscle metabolism. However, the reported effects depend on dose, route, and experimental model, and replication across laboratories is limited. Human trials have not established comparable outcomes, so claims about exercise performance remain speculative. The absence of controlled human data is a central limitation in interpreting these observations.
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 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.
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.
=== Pyruvic acid production by glycolysis === In the last step of glycolysis, phosphoenolpyruvate (PEP) is converted to pyruvate by pyruvate kinase. This reaction is strongly exergonic and irreversible; in gluconeogenesis, it takes two enzymes, pyruvate carboxylase and PEP carboxykinase, to catalyze the reverse transformation of pyruvate to PEP.
=== December === 1 December – A Bangladeshi court convicts MP and former minister Tulip Siddiq of corruption charges and sentences her in her absence to two years in custody. Siddiq describes the sentence as "deeply unfair". Richard Hughes resigns as chair of the Office for Budget Responsibility as an inquiry is launched into how details of the November 2025 United Kingdom budget were published 40 minutes before Chancellor Rachel Reeves delivered the statement to Parliament. Former Conservative MPs Jonathan Gullis, Chris Green and Lia Nici defect to Reform UK. Belfast City Council votes in favour of flying the Palestinian flag above City Hall. 2 December – The High Court rejects an emergency legal application by Traditional Unionist Voice to have the Palestinian flag taken down from Belfast City Hall. 3 December – German President Frank-Walter Steinmeier and his wife Elke Büdenbender are welcomed by King Charles III and Queen Camilla on a state visit to the UK, the first to be made by a German leader for 27 years. Markus Campbell-Savours is suspended from the Parliamentary Labour Party for rebelling against the family farm tax. Reform UK launches an investigation into the online activity of Ian Cooper, the leader of Staffordshire County Council, following allegations he posted racist comments online. 5 December – It is announced that Chancellor Rachel Reeves will not face an investigation by ethics adviser Sir Laurie Magnus over whether or not her pre-budget interventions broke the ministerial code.
==== 2020s ==== In August 2025, Teva released the first generic version of a GLP-1 semaglutide product, named Saxenda. Saxenda is not a generic version of semaglutide (Ozempic) which is within patent protection. Saxenda is a generic of an older medication, liraglutide, that has been found to cause thyroid cancer in rats but with no evidence this risk extends to humans.
== Self-assembled monolayers on solid substrates == Self-assembled monolayers (SAMs) are made of a layer of organic molecules which forms naturally as an ordered lattice on the surface of a desired substrate. Their molecules in the lattice have connections chemically at one end (head group), while the other end (end group) creates the exposed surface of the SAM. Many types of SAMs can be formed. For example: thiols form SAMs on gold, silver, copper, or on some compound semiconductors such as InP and GaAs. By changing the tail group of the molecules, different surface properties can be obtained; therefore SAMs can be used to render surfaces hydrophobic or hydrophilic as well as change surface states of semiconductor. With self-assembly, positioning of SAMs is used to define chemical system precisely to find the target location in a molecular-inorganic device. With this characteristic, SAMs is a good candidates for molecular electronic devices such as use SAMs to build electronic devices and maybe the circuits is an intriguing prospect. Because of their ability to provide the basis for very high-density data storage and high-speed devices.
Sources: en.wikipedia.org
===== Animals raised in captivity ===== Since TCM recognizes bear bile as a treatment compound, more than 12,000 asiatic black bears are held in bear farms. The bile is extracted through a permanent hole in the abdomen leading to the gall bladder, which can cause severe pain. This can lead to bears trying to kill themselves. As of 2012, approximately 10,000 bears are farmed in China for their bile. This practice has spurred public outcry across the country. The bile is collected from live bears via a surgical procedure. As of March 2020 bear bile as ingredient of Tan Re Qing injection remains on the list of remedies recommended for treatment of "severe cases" of COVID-19 by National Health Commission of China and the National Administration of Traditional Chinese Medicine. The tortoise (freshwater turtle, guiban) and turtle (Chinese softshell turtle, biejia) species used in traditional Chinese medicine are raised on farms, However, issues concerning the overexploitation of wild Asian turtles in China have not been completely solved.
== History == In 1982, Nobel laureate James P. Allison first discovered a clonally expressed T-cell surface epitope in murine T lymphoma. In 1983, Ellis Reinherz first defined the structure of the human T-cell receptor using anti-idiotypic monoclonal antibodies to T-cell clones, complemented by studies in the mouse by Philippa Marrack and John Kappler. Then, Tak Wah Mak and Mark M. Davis identified the cDNA clones encoding the human and mouse TCR respectively in 1984. These findings allowed the entity and structure of the elusive TCR, known before as the "Holy Grail of Immunology", to be revealed. This allowed scientists from around the world to carry out studies on the TCR, leading to important studies in the fields of CAR-T, cancer immunotherapy and checkpoint inhibition.
====== Alcohol-related programmes ====== A high amount of media coverage exists informing people of the dangers of driving drunk. Most people who recreationally consume alcohol are now aware of these dangers and safe ride techniques like 'designated drivers' and free taxicab programmes are reducing the number of drunk-driving crashes. Many cities have free-ride-home programmes during holidays involving high amounts of alcohol use, and some bars and clubs will provide a visibly drunk patron with a free cab ride. In New South Wales groups of licensees have formed local liquor accords and collectively developed, implemented and promoted a range of harm minimisation programmes including the aforementioned 'designated driver' and 'late night patron transport' schemes. Many of the transport schemes are free of charge to patrons, to encourage them to avoid drink-driving and at the same time reduce the impact of noisy patrons loitering around late night venues. Moderation Management is a programme which helps drinkers to cut back on their consumption of alcohol by encouraging safe drinking behaviour. Harm reduction in alcohol dependency could be instituted by use of naltrexone.
Sources: en.wikipedia.org
{\displaystyle \delta {\ce {^{13}C}}=\left({\frac {\left({\frac {{\ce {^{13}C}}}{{\ce {^{12}C}}}}\right)_{\text{sample}}}{\left({\frac {{\ce {^{13}C}}}{{\ce {^{12}C}}}}\right)_{\text{standard}}}}-1\right)\times 1000}
== Casualties == In total, Georgia suffered three combat fatalities (all in 2008) and at least 19 servicemen were injured in Iraq. In addition, one Georgian serviceman died in a car accident and one committed suicide, both in 2007.
==== 14 March ==== Following the secession of Slovakia and Ruthenia, British Ambassador to Czechoslovakia Basil Newton advised President Hácha to meet with Hitler. When Hácha arrived in Berlin on 14 March, he met with the German Foreign Minister, Joachim von Ribbentrop prior to meeting with Hitler. Von Ribbentrop testified at the Nuremberg trials that during this meeting, Hácha had told him that "he wanted to place the fate of the Czech State in the Führer's hands." Hácha later met with Hitler, where Hitler gave the Czech President two options: cooperate with Germany, in which case the "entry of German troops would take place in a tolerable manner" and "permit Czechoslovakia a generous life of her own, autonomy and a degree of national freedom..." or face a scenario in which "resistance would be broken by force of arms, using all means." Minutes of the conversation noted that for Hácha this was the most difficult decision of his life but believed that in only a few years this decision would be comprehensible and in 50 years would probably be regarded as a blessing. After the negotiations had finished, Hitler told his secretaries, "It is the greatest triumph of my life! I shall enter history as the greatest German of them all." According to Joachim Fest, Hácha suffered a heart attack induced by Hermann Göring's threat to bomb the capital and by four o'clock he contacted Prague, effectively "signing Czechoslovakia away" to Germany.
Sources: en.wikipedia.org
Liquid chromatography–mass spectrometry is common for identity and purity checks. High-performance liquid chromatography with ultraviolet detection can also be used. Both methods require a suitable reference standard.
The solid is usually kept desiccated at -20 °C or lower and protected from light. Stock solutions are aliquoted to limit freeze–thaw cycles. Aqueous solutions are not generally recommended for long-term storage.
Laws differ by country and by intended use. It is not an approved medicine, and many vendors sell it as a research chemical. Purchasers are responsible for confirming local restrictions.
Liquid chromatography-tandem mass spectrometry is a common approach. It can detect the parent compound and its metabolites in biological matrices.