This is a working overview of reference standard, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-10-03. Anything still debated is marked as such rather than presented as settled.
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.
Scientific discussion of SR9009 often separates animal evidence from human anecdote. Rodent studies provide controlled data on endurance, metabolism, and gene expression, but they use specific strains, doses, and treatment durations. Human reports are mostly uncontrolled and cannot establish cause and effect. Open questions include oral bioavailability, tissue distribution, metabolic stability, and long-term effects. Review articles generally call for more rigorous pharmacokinetic and safety research before any clinical use could be considered.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. It is not a steroid, peptide, or natural hormone. In scientific literature, it appears under the code SR9009 and in non-scientific contexts as Stenabolic. The compound was identified through chemical screening efforts aimed at targeting circadian clock components. Its status remains investigational, and no regulatory agency has approved it as a human medicine.
REV-ERB proteins help regulate daily cycles in gene expression, including genes tied to lipid and glucose metabolism. SR9009 binds these receptors and alters their activity in cell and animal experiments. Consequences observed in rodents include changes in skeletal muscle oxidative capacity, blood lipid levels, and exercise performance. The precise chain from receptor occupancy to whole-body effects is still an active area of study. Human responses cannot be assumed from rodent data.
Most published work on SR9009 consists of preclinical studies. It is widely sold as a research chemical, a category that does not imply safety, efficacy, or pharmaceutical-grade quality. Sports anti-doping organizations have listed SR9009 as a prohibited substance, and its presence in an athlete sample can lead to sanctions. Legal status differs by country; in several jurisdictions it is not approved for human consumption and may be treated as an unapproved new drug.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Not approved for human use | Investigational status in most countries |
| Sports status | Prohibited by WADA | Classified as non-approved or metabolic modulator |
| Common analytical method | LC-MS/MS | Used for trace detection in biological samples |
| Typical test matrices | Urine and blood | Sample choice depends on testing program |
| Human trial data | None published | Effects and safety are not established |
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.
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 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.
== Signals and noise == One of the most important components of analytical chemistry is maximizing the desired signal while minimizing the associated noise. The analytical figure of merit is known as the signal-to-noise ratio (S/N or SNR). Noise can arise from environmental factors as well as from fundamental physical processes.
Freeze branding was rapidly adopted by European livestock operations, as dry ice and liquid nitrogen are easily procured there thanks to denser infrastructure and transport networks. The technique has also been embraced by many breeder associations such as the Arabian Horse Registry as a more humane method of permanently identifying animals. Cryo-branding has been especially welcomed by tanners, whose antipathy towards hot branding is as old as hot branding itself. Freeze branding does not damage the lower corium layer dividing skin from subcutaneous tissue. The far less extensive skin injury caused by freeze branding greatly reduces the persistence of the mark in finished leather. Tanners have often advocated for placing the brand on the cow's jaw rather than the haunches or the saddle, the source of the best quality leather on an animal's hide. Scientific studies have verified freeze branding as effective on the jaws of cattle. Jaw branding has the disadvantage of a cow's tendency to turn its head and return the gaze of a person trying to inspect its brand, hiding it from view. Farrell continued searching for novel means of destroying pigmentation to create permanent marks on animals. In the early 1970s, he pioneered the use of lasers to brand fish while still underwater. He received a patent in 1975 for the method, which involved a bundle of fiber optic light channels held to a fish's side.
=== Education === Newsom joined Long Beach City College Superintendent Eloy Oakley in a November 2015 op-ed calling for the creation of the California College Promise, which would create partnerships between public schools, public universities, and employers and offer a free community college education. Throughout 2016, he joined Oakland mayor Libby Schaaf at the launch of the Oakland Promise and Second Lady Jill Biden and Los Angeles mayor Eric Garcetti at the launch of the LA Promise. In June 2016, Newsom helped secure $15 million in the state budget to support the creation of promise programs throughout the state. In December 2015, Newsom called on the University of California to reclassify computer science courses as a core academic class to incentivize more high schools to offer computer science curricula. He sponsored successful legislation signed by Governor Brown in September 2016, that began the planning process for expanding computer science education to all state students, beginning as early as kindergarten. In 2016, Newsom led an effort to enact a series of reforms at the University of California to give student-athletes additional academic and injury-related support, and to ensure that contracts for athletic directors and coaches emphasized academic progress. This came in response to several athletics programs, including the University of California–Berkeley's football team, which had the lowest graduation rates in the country.
Sources: en.wikipedia.org
As seen in Figure 2, keto acid 1 was generated from the keto aldehyde that was converted to the silyl ether via asymmetric allylboration and silylation of the resulting alcohol. Ozonolysis of the silyl ether and Lindgren–Pinnick oxidation of the aldehyde afforded the keto acid. Ketone 2 was constructed via Enders alkylation starting from the hydrazone. Ozonolysis, the last step of the Enders alkylation, was followed by reduction of the aldehyde and silylation of the resulting alcohol. Hydrogenolysis of the benzyl ether gave the alcohol, which was oxidized under Swern condition and alkylated with the Grignard reagent to yield the secondary alcohol. Oxidation of this alcohol with the Ley–Griffith reagent gave the desired ketone. Thiazole 3 was synthesized from the ester, which was reduced with diisobutylaluminium hydride, and the aldehyde was reacted with the stabilized ylide in the Wittig reaction. Asymmetric allylboration of the α,β-unsaturated aldehyde and protection of the hydroxy group gave the silyl ether, whose terminal olefin was reacted with osmium tetroxide to a diol that was cleaved with lead tetraacetate to furnish the aldehyde. Reduction, iodination, and treatment with triphenylphosphine led to phosphonium salt.
Mutagenesis experiment: The direct method to investigate the DFE is to induce mutations and then measure the mutational fitness effects, which has already been done in viruses, bacteria, yeast, and Drosophila. For example, most studies of the DFE in viruses used site-directed mutagenesis to create point mutations and measure relative fitness of each mutant. In Escherichia coli, one study used transposon mutagenesis to directly measure the fitness of a random insertion of a derivative of Tn10. In yeast, a combined mutagenesis and deep sequencing approach has been developed to generate high-quality systematic mutant libraries and measure fitness in high throughput. However, given that many mutations have effects too small to be detected and that mutagenesis experiments can detect only mutations of moderately large effect; DNA sequence analysis can provide valuable information about these mutations.
Modeled on Europe's Christkindlmarkt, in 2002 Bryant Park introduced the Holiday Shops in an effort to liven up the park space during the winter. Initially slow to gain traction, the Holiday Shops became a fixture of the Manhattan holiday scene in 2005 by adding an ice-skating rink. The Shops also include a Norway Spruce tree, as well as a standalone dining and event space. Sponsored by Bank of America, Winter Village can be set up within two weeks. In September 2016, Bryant Park Corporation announced market makers Urbanspace as the new operator for the Holiday Shops, which grew from 80 boutiques in 2002 to over 170 in 2018. In 2018, Urbanspace also took over management of the rinkside eatery, rebranding it as The Lodge. The Gothamist wrote in 2024 that visitors had mixed views of Winter Village; though tourists and some New Yorkers liked Winter Village's shops and food stands, detractors felt that the shops were overcrowded.
Sources: en.wikipedia.org
No. It is an investigational compound without approved therapeutic indications. It is sold for research purposes only in many jurisdictions.
Sports authorities prohibit it because it is not approved for human use and has potential performance-enhancing effects. It appears on anti-doping lists under non-approved or metabolic modulator categories.
Detection usually uses liquid chromatography-tandem mass spectrometry. The method targets the parent compound or its metabolites in urine or blood.
It is a synthetic compound studied as an agonist of REV-ERB nuclear receptors. It is not an approved medicine and has mainly been examined in laboratory and animal research.