circadian rhythm raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2025-09-12 and is reviewed periodically as new material appears.
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.
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.
SR9009 binds REV-ERB receptors and alters their repressive activity on target genes. This action can change transcription of genes involved in lipid handling, glucose metabolism, and mitochondrial function. In rodent studies, treated animals have shown changes in muscle oxidative capacity and exercise performance, though effects vary by dose, duration, and model. The precise molecular steps connecting receptor binding to whole-body outcomes are still an active area of investigation. Findings in animals do not automatically translate to humans.
Because REV-ERB receptors are core clock components, SR9009 has been examined for effects on daily rhythms as well as metabolism. Research has explored whether the compound can shift or reinforce circadian gene expression in tissues such as liver and muscle. Some studies report improved metabolic markers in obese or diabetic mice, while others show context-dependent responses. Questions remain about which effects are direct, which are secondary to timing, and how they might differ across species.
| 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 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.
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 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.
Apigenin (4′,5,7-trihydroxyflavone), found in many plants, is a flavone compound that is the aglycone of several naturally occurring glycosides. It is a yellow crystalline solid that has been used to dye wool. Apigenin is abundant in parsley, celery, celeriac, and chamomile flowers. It occurs in many fruits and vegetables, with the highest concentrations in dried and fresh parsley.
Murchison contains common amino acids such as glycine, alanine, and glutamic acid as well as unusual ones such as isovaline and pseudoleucine. A complex mixture of alkanes was isolated as well, similar to that found in the Miller–Urey experiment. Serine and threonine, usually considered to be earthly contaminants, were conspicuously absent in the samples. A specific family of amino acids called diamino acids was identified in the Murchison meteorite as well. The initial report in 1970 stated that the amino acids were racemic and therefore formed in an abiotic manner, because amino acids of terrestrial proteins are all of the L-configuration of chirality. Later, in 1982, it was reported that the amino acid alanine had an excess of the L-configuration, but this is a protein amino acid which led several scientists to suspect terrestrial contamination according to the argument that it would be "unusual for an abiotic stereoselective decomposition or synthesis of amino acids to occur with protein amino acids but not with non-protein amino acids". But in 1997, L-excesses were also reported for several non-protein amino acids, suggesting an extraterrestrial source for molecular asymmetry in the Solar System. Some amino acids were found to be racemic (equal quantities of right-handed and left-handed). Around the same time, an enrichment in the isotope 15N was reported, however this result and the non-racemicity of alanine (but not of the others) were explained as possibly due to analysis error.
Shakey's Pizza was founded in Sacramento, California, on April 30, 1954, by Sherwood "Shakey" Johnson and Ed Plummer. Johnson's nickname resulted from nerve damage following a bout of malaria suffered during World War II. The parlor opened on a weekend, but since the pizza ovens were not yet completed, only beer was served. Shakey took the profits from beer sales and bought ingredients for pizza the following Monday. Shakey personally played Dixieland jazz piano to entertain patrons. He also hired the original members of the Silver Dollar Jazz Band, paying the musicians $10 each plus all the beer and pizza they wanted (Shakey soon realized it was cheaper to pay the musicians scale). This brought the music of Lu Watters to the Sacramento area, causing a local sensation. Jazz historian K.O. Eckland has given the band the credit for the jazz revival in Sacramento that extended to the formation of the Sacramento Traditional Jazz Society. Shakey's also became known outside Sacramento, not for its pizza, but for the jazz program it sponsored on a regional radio network. Shakey Johnson is honored in the American Banjo Museum in Oklahoma City, Oklahoma, for his longtime use of banjo music at his pizza parlors. Other live music, including piano, was also a staple in the old Shakey's parlors. Up until the early 1970s, printed menus included lyrics to classic barbershop songs so that the customers could sing along with the band while their meals were being prepared.
In 2020, urea derivative 3 (Table 1) was identified via high-throughput screening (HTS), as a competitive inhibitor of ERAP1 aminopeptidase activity (IC50 = 6.9 μM) with increased selectivity over ERAP2 and IRAP. SAR exploration and docking studies showed that the N-acetylpiperazine carbonyl group was critical for the activity via its zinc-binding group properties.
Sources: en.wikipedia.org
Following defeat by Napoleon in 1805, Austria was forced to cede Tyrol to the Kingdom of Bavaria in the Peace of Pressburg. Tyrol as a part of Bavaria became a member of the Confederation of the Rhine in 1806. The 1808 Bavarian constitution abolished traditional administrative divisions and replaced them with Kreise; Tyrol's territory was split up into:
==== Solar cells ==== Graphene has been used on different substrates such as Si, CdS and CdSe to produce Schottky junction solar cells. Through the properties of graphene, such as graphene's work function, solar cell efficiency can be optimized. An advantage of graphene electrodes is the ability to produce inexpensive Schottky junction solar cells.
He forgets that one of the most cunning and interesting aspects of consumer music, the mass media, and indeed of capitalism itself, is their fluidity, their unending capacity for adaptation and assimilation." On the other hand, the scholar Slavoj Žižek has written a foreword to Adorno's In Search of Wagner, in which Žižek attributes an "emancipatory impulse" to the same book—although Žižek also suggests that fidelity to this impulse demands "a betrayal of the explicit theses of Adorno's Wagner study" In a 2014 New Yorker article, music critic Alex Ross discussed the continued relevance of Theodor Adorno's work in the digital age, stating, "The pop hegemony is all but complete, its superstars dominating the media and wielding the economic might of tycoons ... Culture appears more monolithic than ever, with a few gigantic corporations—Google, Apple, Facebook, Amazon—presiding over unprecedented monopolies." Adorno's critique of commercial media capitalism has continued to influence academic discussions. Scholars often reference his work to explore how Western entertainment industries may contribute to the reinforcement of global capitalism and Western cultural dominance. This perspective is reflected in studies that examine the role of transnational media corporations in shaping cultural production. For example, in The US Empire's Culture Industry, Tanner Mirrlees explores how Western commercial entertainment is often maintained by large transnational media corporations, rather than emerging organically from local cultural traditions.
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 research compound that acts on REV-ERB nuclear receptors. It is not approved for human use and is sold only as a research chemical. Its effects have been studied mainly in cells and rodents.