NR1D2 raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2025-09-02. Anything still debated is marked as such rather than presented as settled.
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.
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.
Analytical methods for SR9009 typically rely on liquid chromatography coupled with tandem mass spectrometry. The technique can separate the parent compound from related substances and detect low concentrations in biological matrices. Urine and blood are common samples in anti-doping testing, while in vitro studies may use cell culture media. Rapid metabolism and low expected concentrations make method validation important for reliable identification. Exact metabolite patterns can vary by species and are not fully mapped.
Regulatory treatment of SR9009 reflects its investigational status. The compound has no approved human therapeutic indication, and sports authorities prohibit its use. It appears on anti-doping lists as a non-approved substance or metabolic modulator, depending on the list version. Products sold online as research chemicals are not quality-controlled medicines, so their identity and purity can differ from the label. Such products may also contain unlisted compounds, which complicates both testing and safety assessment.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Common supplier description |
| Solubility | Soluble in DMSO and ethanol | Low solubility in water |
| Typical storage | −20 °C, desiccated, dark | For research samples |
| Analytical method | LC-MS/MS | Used for detection and quantification |
| Regulatory status | Prohibited in sport | WADA metabolic modulator class |
SR9009 is not approved as a medicine by major regulatory agencies. It is commonly sold as a research chemical, a category that may fall outside customary drug approval and quality rules. In sports, the World Anti-Doping Agency lists SR9009 as a prohibited substance. Athletes who use it can face sanctions if it is detected in a sample. Legal status varies by country, and importation may be restricted. Enforcement practices differ across borders.
Detection of SR9009 in biological samples usually employs liquid chromatography coupled with tandem mass spectrometry. This method can identify the parent compound and sometimes metabolites in urine or blood. Because exposure can be low and clearance may be rapid, sample timing and limits of detection matter. Laboratories validate assays for sensitivity and specificity. Results are interpreted alongside chain-of-custody and quality-control records. Urine is the common matrix for anti-doping analysis, while blood may be used in research settings.
Handling recommendations for SR9009 in a laboratory setting include storing the solid at low temperature, protected from light and moisture. The compound is often dissolved in dimethyl sulfoxide or ethanol for experiments. Solutions should be prepared with appropriate personal protective equipment and disposed of according to local rules. Stability data for long-term storage are limited, so stock solutions are typically kept cold and used within defined periods. Records of preparation date and concentration support reproducibility.
SR9009 is generally described as poorly soluble in water and more soluble in organic solvents such as dimethyl sulfoxide and ethanol. Stock solutions are commonly prepared in an organic solvent before dilution into an aqueous buffer or vehicle. Precipitation can occur if the organic fraction is reduced too quickly or if the final concentration exceeds the compound's solubility limit. Sonication or gentle warming may aid dissolution in some protocols, but excessive heat can promote degradation. Container material and pH can also influence observed solubility.
For long-term storage, SR9009 is typically kept as a solid at low temperature, protected from moisture and light. Desiccated conditions limit hydrolysis, while opaque containers reduce photochemical breakdown. Solutions are less stable than solids and are often stored frozen in aliquots to avoid repeated freeze-thaw cycles. Stability data are not standardized across all suppliers, so users should rely on certificate-of-analysis information when available. Degradation may appear as color change, precipitate, or decreased chromatographic purity.
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.
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.
Zionism seeks to establish a home in Palestine for the Jewish people, secured under public law. The Second Aliyah (1904–1914) began after the Kishinev pogrom; some 40,000 Jews settled in Palestine, although nearly half of them left eventually. Both the first and second waves of migrants were mainly Orthodox Jews, although the Second Aliyah included socialist groups who established the kibbutz movement. Though the immigrants of the Second Aliyah largely sought to create communal agricultural settlements, the period saw the establishment of Tel Aviv as the first planned Jewish town in 1909. This period also saw the emergence of Jewish armed militias, the first being Bar-Giora, a guard founded in 1907. Two years later, the larger Hashomer organization was founded as its replacement. The Sykes–Picot Agreement of 16 May 1916 set aside the region of Palestine for "international administration" under British control. The first official use of the phrase "national home for the Jewish people" was in the Balfour Declaration. The phrase "national home" was intentionally used instead of "state" because of opposition to the Zionist program within the British Cabinet. The initial draft of the declaration referred to the principle "that Palestine should be reconstituted as the National Home of the Jewish people."
Coconut coir, also known as coir peat, is a natural byproduct derived from coconut processing. The outer husk of a coconut consists of fibers which are commonly used to make a myriad of items ranging from floor mats to brushes. After the long fibers are used for those applications, the dust and short fibers are merged to create coir. Coconuts absorb high levels of nutrients throughout their life cycle, so the coir must undergo a maturation process before it becomes a viable growth medium. This process removes salt, tannins and phenolic compounds through substantial water washing. Contaminated water is a byproduct of this process, as three hundred to six hundred liters of water per one cubic meter of coir are needed. Additionally, this maturation can take up to six months and one study concluded the working conditions during the maturation process are dangerous and would be illegal in North America and Europe. Despite requiring attention, posing health risks and environmental impacts, coconut coir has impressive material properties. When exposed to water, the brown, dry, chunky and fibrous material expands nearly three or four times its original size. This characteristic combined with coconut coir's water retention capacity and resistance to pests and diseases make it an effective growth medium. Used as an alternative to rock wool, coconut coir offers optimized growing conditions.
David Baker (born October 6, 1962) is an American biochemist and computational biologist who has pioneered methods to design proteins and predict their three-dimensional structures. He is the Henrietta and Aubrey Davis Endowed Professor in Biochemistry, an investigator with the Howard Hughes Medical Institute, and an adjunct professor of genome sciences, bioengineering, chemical engineering, computer science, and physics at the University of Washington. He was awarded the shared 2024 Nobel Prize in Chemistry for his work on computational protein design. Baker is a member of the United States National Academy of Sciences and of the United States National Academy of Engineering, and is the director of the University of Washington's Institute for Protein Design. He has co-founded more than a dozen biotechnology companies and was included in Time magazine's inaugural list of the 100 Most Influential People in health in 2024.
Sources: en.wikipedia.org
tried to fight with Noriega's help, remained firmly in power in Nicaragua, and argued that this demonstrated the failure of the U.S.'s approach to Latin American interventions. Noriega took great care to shape perceptions of him. He permitted and encouraged rumors that as Panama's chief of intelligence, he was in possession of negative information about everybody in the country. Dinges suggests that the impression among some officials that Noriega made money off of every transaction in the country may have been cultivated by Noriega himself. Among opposition leaders in Panama, he was seen variously as a sexual pervert, a sadist, and a rapist. Within U.S. government circles, contradictory images abounded; Noriega was seen as a CIA spy, a drug trafficker, a nationalist supporting Torrijos, an ally of Cuba, and an ally of Oliver North and the Contras. He was perceived as a trusted collaborator in the war against drugs, even as the DEA was investigating him for involvement in smuggling. By the time of his removal, he had come to be hated in the U.S., and the invasion was portrayed as an attempt to remove an evil man. Dinges writes that these contradictory images played a large role in shaping the U.S. government's self-contradictory policy towards Noriega. Noriega used the moniker "El Man" to refer to himself, but he was also derogatorily known as cara de piña, or "pineapple face" in Spanish, as a result of pockmarked features left by acne in his youth. He detested the name, and it would later be the subject of a lawsuit.
Candelariella deppeanae is a species of lichen in the family Candelariaceae. Found in southwestern North America, it was formally described as a new species in 2007 by the Swedish lichenologist Martin Westberg. The type specimen was collected in the Chiricahua Mountains (Chiricahua National Monument, Arizona) at an elevation of 1,750 m (5,740 ft). Here, in an oak forest, it was found growing on a decorticated (barkless) part of alligator juniper (Juniperus deppeana). Most collections of the lichen are from the wood or trunks of this juniper plant; the species epithet deppeanae alludes to this close relationship. The lichen has a greenish-yellow to yellow, granular to areolate thallus. It has also been collected in Texas, and from Chihuahua, Baja California Norte and Baja California Sur. The lichen grows mainly on wood and decorticated trunks, but has also been less frequently recorded growing on bark. Secondary chemicals that have been detected in Candelariella deppeanae (using high-performance liquid chromatography) include calycin, pulvic acid lactone, vulpinic acid, and pulvinic acid.
denaturation The process by which nucleic acids or proteins lose their quaternary, tertiary, and/or secondary structures, either reversibly or irreversibly, through the application of some external chemical or mechanical stress, e.g. by heating, agitation, or exposure to a strong acid or base, all of which can disrupt intermolecular forces such as hydrogen bonding and thereby change or destroy chemical activity. Denatured proteins may be both a cause and a consequence of cell death. Denaturation may also be a normal process; the denaturation of double-stranded DNA molecules, for example, which breaks the hydrogen bonds between base pairs and causes the separation of the duplex molecule into two single strands, is a necessary step in DNA replication and transcription and hence is routinely performed by enzymes such as helicases. The same mechanism is also fundamental to laboratory methods such as PCR.
Sources: en.wikipedia.org
=== 2000–2009 === In late June 2000, Lake Wales Medical Centers announced that it would have a new emergency department with private treatment rooms constructed; it would double the size of the emergency department. The intensive care unit would be moved to the second floor. Ambulatory surgery would be moved to the first story and take over the former ICU and emergency department. The surgical suit would be expanded. Two of the primary emergency treatment rooms would become endoscopy rooms. In early February 2001, the hospital wanted to move its medical records, human resources and housekeeping to the first story of the nursing home. Before they could be moved it had to get permission from the Agency for Health Care Administration to change the license of the first story. Demolition of the old hospital started in August, it would take two to three months to demolish and cost $5 to 6 million due to asbestos. In January 2002, construction workers started to construct the new emergency department. In late May 2003, Lake Wales Medical Center's 14,000 square foot (1,300 m2) emergency department opened to patients; it cost $4.5 million to build. In late July 2002, Mid Florida Medical Services decided to sell the hospital after hearing from local residents. In early September, both Community Health Systems and Health Management Associates were interested in buying the hospital. On December 2, Lake Wales Medical Centers was purchased by Community Health Systems from Mid-Florida Medical Services. In August 2007, renovations at the hospital were completed at a cost of $6.9 million.
=== March === 1 March COVID-19 in the UK Lockdown Files: WhatsApp messages leaked to the Daily Telegraph are reported as suggesting former Health Secretary Matt Hancock chose to ignore advice from experts in April 2020 that there should be "testing of all going into care homes". A spokesman for Hancock says "These stolen messages have been doctored to create a false story that Matt rejected clinical advice on care home testing". A Freedom of Information request by BBC News reveals that 729 sex offenders who were under supervision disappeared off the radar in a three-year period from 2019 to the end of 2021. 2 March COVID-19 in the UK: Lockdown Files: The Daily Telegraph publishes more of Matt Hancock's WhatsApp exchanges, this time with former education secretary Gavin Williamson in December 2020, when a debate into whether schools should reopen following the Christmas holiday was taking place. The leaked messages suggest Hancock favoured school closures, while Williamson was more hesitant. Hancock, who worked alongside journalist Isabel Oakeshott to co-author a book, describes the release of the messages as a "massive betrayal and breach of trust". In response, Oakeshott says she released the messages because she believed doing so was in the "public interest". Sir Keir Starmer unveils Sue Gray, who led the investigation into the Partygate scandal, as Labour's new chief of staff, sparking concern among some Conservative MPs about her impartiality.
2019: New Zealand chemist Margaret Brimble is the first New Zealand woman to be inducted into the Division of Medicinal Chemistry of the American Chemical Society’s Hall of Fame. 2019: Malawian nurse and educator Address Malata is appointed as Vice-Chancellor of the Malawi University of Science and Technology (MUST), becoming the first Malawian women university Vice-Chancellor. 2019: American imaging scientist Katie Bouman developed an algorithm that made the first visualization of a black hole possible using the Event Horizon Telescope. She was part of the team of over 200 people who implemented the project.
=== Initiation === RNA polymerase binding in bacteria involves the sigma factor recognizing the core promoter region containing the −35 and −10 elements (located before the beginning of sequence to be transcribed) and also, at some promoters, the α subunit C-terminal domain recognizing promoter upstream elements. There are multiple interchangeable sigma factors, each of which recognizes a distinct set of promoters. For example, in E. coli, σ70 is expressed under normal conditions and recognizes promoters for genes required under normal conditions ("housekeeping genes"), while σ32 recognizes promoters for genes required at high temperatures ("heat-shock genes"). In archaea and eukaryotes, the functions of the bacterial general transcription factor sigma are performed by multiple general transcription factors that work together. The RNA polymerase-promoter closed complex is usually referred to as the "transcription preinitiation complex." After binding to the DNA, the RNA polymerase switches from a closed complex to an open complex. This change involves the separation of the DNA strands to form an unwound section of DNA of approximately 13 bp, referred to as the "transcription bubble". Supercoiling plays an important part in polymerase activity because of the unwinding and rewinding of DNA. Because regions of DNA in front of RNAP are unwound, there are compensatory positive supercoils. Regions behind RNAP are rewound and negative supercoils are present.
Sources: en.wikipedia.org
Legality depends on the country and the intended use. In many places it is sold as a research chemical, but sports and medicine regulations restrict it.
Detection commonly uses liquid chromatography–tandem mass spectrometry. This method can identify the compound in urine or blood at low concentrations.
Typical guidance is −20 °C, dry, and protected from light. Solutions should be aliquoted and limited freeze–thaw cycles should be used.
No. It is an investigational compound without approved therapeutic indications. It is sold for research purposes only in many jurisdictions.