nuclear receptor comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Last reviewed on 2026-03-05. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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 |
|---|---|---|
| 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. |
Analytical chemists detect SR9009 with liquid chromatography-tandem mass spectrometry, commonly abbreviated LC-MS/MS. Sample preparation may involve protein precipitation, liquid-liquid extraction, or solid-phase extraction before analysis. Laboratories can target the parent compound or its metabolites, depending on the matrix and the purpose of testing. Anti-doping methods require sensitive and specific assays because concentrations in biological samples can be low. Reference standards and validated methods are essential for reliable identification and quantification.
Regulatory agencies have not approved SR9009 for human therapeutic use. It is typically sold as a research chemical with labels stating that it is not for human consumption. The World Anti-Doping Agency prohibits the substance in sport, generally under the category of non-approved substances. Customs and national laws may restrict importation, sale, or possession. Product quality and legal status can vary by country and vendor, and therapeutic claims are not permitted in regulated advertising because the compound lacks approval.
Several misconceptions surround SR9009. It is often described as a SARM, a steroid, or an exercise pill, but its known target is the REV-ERB receptor family. Rodent studies have examined exercise capacity and metabolic markers, yet human outcomes remain unproven. Oral bioavailability appears low in animals, and human pharmacokinetics are not well characterized. Online products may contain impurities or different compounds, so identity and purity testing are important for research use.
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.
=== Carbon-Carbon Composite for Hip Joint Implant === The main properties required from an artificial joint implant are long term strength and stability under cyclic load (up to seven times body weight), bio-chemical inertness, wear resistance and biological bio-compatibility. Years of clinical experience with a variety of metals and polymers fell short of achieving all the requirements. Carbon is the basic component of organic material and in certain configurations is extremely stable mechanically and chemically. In this pioneer collaboration between Rafael industry and scientists from the Technion, a carbon composite hip implant was constructed. The implant was created using carbon fibers and carbon matrix. The result achieved three dimensions stability in compression and tension. The composite hip was implanted in animal experiments at the Technion laboratory by a team of the Center for Implant Surgery. These experiments did, however, uncover the one disadvantage of carbon composite: weakness in resistance to wear in friction and cyclic motion.
When two atoms are displaced, it is referred to as a "twist" pucker, in reference to the zigzag orientation. In an "endo" pucker, the major displacement of atoms is on the β-face, the same side as the C4'-C5' bond and the base. In an "exo" pucker, the major displacement of atoms is on the α-face, on the opposite side of the ring. The major forms of ribose are the 3'-endo pucker (commonly adopted by RNA and A-form DNA) and 2'-endo pucker (commonly adopted by B-form DNA). These ring puckers are developed from changes in ring torsion angles; there are infinite combinations of angles so therefore, there is an infinite number of transposable pucker conformations, each separated by disparate activation energies.
Ruth Levitas (born 15 May 1949 in London) is emeritus Professor in the Department of Sociology at the University of Bristol. She is well known internationally for her research on utopia and utopian studies. Her book, The Concept of Utopia (1990), addresses the notion of the ideal society throughout European history. Her follow-on book, Utopia as Method: The Imaginary Reconstitution of Society (2013), makes the case that 'utopia should be understood as a method rather than a goal.' She has formulated a program of sociology which is fundamentally utopian-focused in conventional sociological discourse. In The Inclusive Society?: Social Exclusion and New Labour (2005), Levitas introduced the idea of social exclusion as part of the new political language. She also introduced the concepts of MUD (the moral underclass discourse), SID (the social integration discourse), and RED (the redistribution discourse), as tools for analysing social exclusion.
James is swept into the Shadow Realm and sees a partygoer being attacked seconds before she collapses in the real world. The day after, Cordelia takes James aside and he reveals his relationship with Grace to her. Cordelia is heartbroken but happy for him. A demon attack wounds Ariadne Bridgestock and Barbara Lightwood, Thomas's oldest sister. In a flashback, James meets Grace once again. She points out that he was in love with Cordelia, which he half-heartedly denied. Later on, Grace requested him to use his shadow abilities to retrieve her Cartwright familial bracelet which Tatiana seized. A demon kept in Tatiana's greenhouse destroys it, and she blames James. Later, James reads a missive addressed to Matthew, signed by Grace. James immediately goes out alone. Jesse visits Lucie in her bedroom and informs her that James is in danger, as Grace was being followed by the Blackthorn family demon and would probably murder anyone who wasn't a Blackthorn. She goes to save James. Cordelia, Matthew and Anna Lightwood (Christopher's older sister) visit Malcolm Fade and Hypatia Vex, where they inquire about the attacks and if the downworlders might have heard of it. Cordelia saves the warlocks' lives, and in return they send for Ragnor Fell who might be able to help Cordelia. In a flashback to 1902, Thomas Lightwood had been gone for his travel year and stopped at Paris. He had met Alastair Carstairs there, and they had toured the whole city amiably. Around that time, Thomas had felt himself warming up to Alastair.
Sources: en.wikipedia.org
129I beta-decays to 129Xe with a half-life of 16.14±0.12 million years. The iodine-xenon chronometer is an isochron technique. Samples are exposed to neutrons in a nuclear reactor. This converts the only stable isotope of iodine (127I) into 128Xe via neutron capture followed by beta decay (of 128I). After irradiation, samples are heated in a series of steps and the xenon isotopic signature of the gas evolved in each step is analysed. When a consistent 129Xe/128Xe ratio is observed across several consecutive temperature steps, it can be interpreted as corresponding to a time at which the sample stopped losing xenon. Samples of a meteorite called Shallowater are usually included in the irradiation to monitor the conversion efficiency from 127I to 128Xe. The difference between the measured 129Xe/128Xe ratios of the sample and Shallowater then corresponds to the different ratios of 129I/127I when they each stopped losing xenon. This in turn corresponds to a difference in age of closure in the early solar system.
=== Tesla Cybertruck incident === On December 24, 2025, a video from a livestream of Peters hitting a man with a Tesla Cybertruck in Miami-Dade County quickly circulated online. In the video, the man climbs onto the hood of the car, and someone off-camera encourages Peters to start driving. He accelerates and appears to run over the man before asking if he is dead. A woman sitting next to him says, "I don't know," to which he responds, "Hopefully." Later in the livestream, Peters speaks to a man in a reflective vest and states that he hit the man in self-defense. Peters alleges that the man had been stalking the streamer and had previously thrown red liquid on him; he also alleges that there were multiple people, one of whom looked like they "had a pistol" underneath their clothing, surrounding his car. A call between him and fellow livestreamer Adin Ross, in which Ross advised him to keep livestreaming and refrain from speaking on the situation, also circulated online. Williams, writing for The Atlantic, called the livestream "perhaps [Peters's] most viral moment". Following the incident, he was banned from Kick. James Fishback, then a fringe candidate for the Republican nomination in the 2026 Florida gubernatorial election, tweeted that Peters had done "nothing wrong" by hitting the man with his car.
Claimed benefits of using probiotic supplements are not supported by sufficient clinical evidence. Meta-analysis studies have reported a modest reduction of antibiotic-associated diarrhea and acute diarrhea in children taking probiotics. There is limited evidence in support of adults using mono-strain and multi-strain containing probiotics for the alleviation of symptoms associated with irritable bowel syndrome. Probiotic supplements are generally regarded as safe.
Sources: en.wikipedia.org
=== Religion === Bukele's religious beliefs were controversial during his 2019 presidential campaign, with rumors that he was a Christian, a Muslim, or an atheist. The controversy began when pictures from 2011 of Bukele praying at a mosque with his father and brothers spread on social media. Bukele dismissed the controversy as an attempt by the political right to exploit Islamophobia in the predominantly Catholic country. Although Bukele does not identify with any religion, he has stated that he believes in God and Jesus. In a 2015 interview, Bukele said: "I am not a person who believes much in the liturgy of religions. However, I believe in God, in Jesus Christ. I believe in his word, I believe in his word revealed in the Holy Bible. And I know that God does not reject anyone because of their origins". Before that year, some Salvadorans believed that he was a Muslim. Bukele has referred to Bible verses, God, and Saint Óscar Romero — the archbishop of San Salvador who was assassinated in 1980 — in some of his speeches, and has called himself an "instrument of God" ("instrumento de Dios"). He met with Pope Francis in April 2015, saying that the pope told him that Rutilio Grande — a Jesuit priest who was assassinated in 1977 — would soon be beatified.
=== Setting === Opposing Force is set in the same location and timeframe as that of Half-Life, taking place at a remote New Mexico laboratory called the Black Mesa Research Facility. In Half-Life, the player takes on the role of Gordon Freeman, a scientist involved in an accident that opens an interdimensional portal to the borderworld of Xen, allowing the alien creatures of Xen to attack the facility. The player controls Freeman in an attempt to escape the facility and close the portal, ultimately traveling to Xen to do so. Opposing Force, however, shows the events of Half-Life from the perspective of a different protagonist. The player assumes the role of Adrian Shephard, a U.S. Marine Corps Corporal assigned to the Hazardous Environment Combat Unit, a specialized unit sent in to Black Mesa by the government to quell the alien threat and silence all witnesses. However, after Shephard becomes isolated from his fellow Marines, he must ally with the Black Mesa personnel and attempt to escape the base.
Behavior (American English) or behaviour (British English) is the range of actions of organisms, individuals, systems or artificial entities in some environment. These systems can include other systems or organisms as well as the inanimate physical environment. It is the computed response of the system or organism to various stimuli or inputs, whether internal or external, conscious or subconscious, overt or covert, and voluntary or involuntary. While some behavior is produced in response to an organism's environment (extrinsic motivation), behavior can also be the product of intrinsic motivation, also referred to as "agency" or "free will". Taking a behavior informatics perspective, a behavior consists of actor, operation, interactions, and their properties. This can be represented as a behavior vector.
== Rivalries == The club's fans share a fierce and often violent rivalry with the supporters of Chemie Leipzig. When both teams met in the quarter finals of the Sachsenpokal in 2016, German daily newspaper Die Welt called the match the "German hooligan summit". An additional reason for the enmity between some fan groups (namely their ultras) is a political one. Whereas certain Chemie fan clubs express left-wing and anti-fascist political views, Lok has vocal supporters from the right and far-right of the political spectrum. Lok also have lesser local rivalry with RB Leipzig.
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.
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.