A practical reference on analytical standard: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-02-10. Anything still debated is marked as such rather than presented as settled.
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.
Laboratory identification of SR9009 typically relies on chromatographic separation coupled to mass spectrometry, often with ultraviolet detection as a secondary check. Nuclear magnetic resonance spectroscopy can confirm molecular structure when a reference standard is available. Because many suppliers sell the compound as a research chemical, independent identity testing is important for experimental reproducibility. A single retention time is not sufficient proof of identity, especially when related compounds may be present. Purity assessments usually report a percentage based on area normalization.
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 and metabolic gene expression. In laboratory experiments, SR9009 binds these receptors and alters transcription of genes involved in lipid handling, glucose metabolism, and mitochondrial function. It is not a naturally occurring compound and has no approved therapeutic use. Research interest stems from its ability to modify energy metabolism in cells and animal models.
In rodent studies, SR9009 has been reported to increase mitochondrial content in skeletal muscle and improve exercise endurance under some conditions. These findings led to popular descriptions such as an exercise mimetic, although that term oversimplifies the biology. Effects vary by dose, timing, tissue, and model. The compound's influence on circadian pathways means that time of administration can matter in experiments. Whether similar metabolic changes occur in humans remains largely unexplored in controlled published trials.
Pharmacokinetic data for SR9009 are limited in published literature. Some reports indicate low oral bioavailability and rapid clearance in animals, which complicates interpretation of exposure and effect. Researchers often use injected routes in preclinical work to achieve measurable systemic levels. Analytical studies rely on mass spectrometry to detect the parent compound and its metabolites. Questions about tissue distribution, active metabolites, and long-term consequences remain open. Species differences in metabolism can affect observed half-life and target engagement.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Visual inspection is not sufficient for identity. |
| Solubility | Soluble in DMSO and ethanol | Low solubility in water; stock solutions use organic solvent. |
| Storage | -20°C, desiccated, protected from light | Limits hydrolysis and photodegradation. |
| Analytical method | HPLC-UV/MS | Used for identity and purity assessment. |
| Synonyms | SR9009, Stenabolic | Naming varies by supplier. |
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.
=== Rock Bottom Restaurant Breweries === The company operates 16 breweries under the name Rock Bottom Restaurant & Brewery. These breweries are located in several states, with five restaurants in Colorado, five in Illinois and one restaurant each in California, Florida, Maryland, Massachusetts, Minnesota and Virginia. The store was renamed Rock Bottom after someone pointed out that they were "building at the bottom of the rock," which was Prudential's slogan at the time. In 2000, the Boston-based Brew Moon Enterprises Inc. filed for bankruptcy and sold four of its five restaurant-microbreweries to Rock Bottom. In 2009, the La Jolla location in San Diego won a medal at the Great American Beer Festival, and in 2012 they medaled at the World Beer Cup. Rock Bottom Restaurants won Brewpub Group Brewer of the Year award at the 2013 Great American Beer Festival (GABF).
==== Heart failure ==== Heart failure can be characterized by a loss of β adrenergic receptor (βAR) signalling in heart cells. When the βAR is stimulated by catecholamines such as adrenaline and noradrenaline, there is normally an increase in the contractility of the heart. However, in heart failure there are sustained and elevated levels of catecholamines which result in chronic desensitization of the βAR receptor. This leads to a decrease in the strength of heart contractions. Some research suggests that this chronic desensitization is due to the over activation of a kinase, G protein-coupled receptor kinase 2 (GRK2), which phosphorylates and deactivates certain G protein coupled receptors . When the G protein coupled receptor is activated, the Gβγ subunit recruits GRK2 which then phosphorylates and desensitizes GPCRs like the βAR. Preventing the interaction of the βγ subunit with GRK2 has therefore been studied as a potential target for increasing heart contractile function. The developed molecule GRK2ct is a protein inhibitor which inhibits the signalling properties of Gβγ subunit but does not interfere with alpha subunit signalling. The over expression of GRK2ct has been shown to significantly rescue cardiac function in murine models of heart failure by blocking Gβγ subunit signalling. In another study, biopsies were taken from patients with heart failure and virally induced overexpression of GRK2ct in the heart myocytes. Other tests showed an improvement in cardiac cell contractile function by inhibiting Gβγ.
== Musical style and influences == Rush's music has been described as progressive rock, hard rock, heavy metal and alternative rock. The band's musical style changed substantially over the years. Its debut album was strongly influenced by British blues-based hard rock and heavy metal: an amalgam of sounds and styles from such rock bands including the Beatles, Black Sabbath, the Who, Cream, and Led Zeppelin. Rush was increasingly influenced by bands of the British progressive rock movement of the mid-1970s, especially Pink Floyd, Genesis, Yes, and Jethro Tull. In the tradition of progressive rock, Rush wrote extended songs with irregular and shifting mood, timbre, and metre, combined with lyrics influenced by Ayn Rand. In the 1980s, Rush merged their sound with trends of this period experimenting with new wave, reggae, and pop rock. The era included the band's most extensive use of instruments such as synthesizers, sequencers, and electronic percussion. In the early 1990s, the band transformed their style once again, returning to a more grounded hard rock style, and simultaneously harmonize with the alternative rock movement. The songs released during this period have been described as "hooky and radio-friendly". The band experimented with fusing heavy metal and progressive rock in "new ways" during its latter years.
Sources: en.wikipedia.org
Prolyl isomerase (also known as peptidylprolyl isomerase or PPIase) is a class of enzymes (EC 5.2.1.8) found in both prokaryotes and eukaryotes that interconvert the cis and trans isomers of peptide bonds with the amino acid proline. Proline has an unusually conformationally restrained peptide bond due to its cyclic structure with its side chain bonded to its secondary amine nitrogen. Most amino acids have a strong energetic preference for the trans peptide bond conformation due to steric hindrance, but proline's unusual structure stabilizes the cis form so that both isomers are populated under biologically relevant conditions. There are three major classes of proteins with prolyl isomerase activity: cyclophilin and FKBPs which together are referred to as immunophilins, and parvulins. These three classes of proteins are not structurally related. Larger proteins can also contain prolyl isomerase domains.
In August 2021, Nando's UK was forced to temporarily close 45 of its 450 restaurants due to a shortage of chicken. A Nando's spokesperson said: "The UK food industry has been experiencing disruption across its supply chain in recent weeks due to staff shortages and Covid isolations, and a number of our restaurants have been impacted." The UK is Nando's largest market.
=== Organic molecules in space === In 1974 Wickramasinghe first proposed the hypothesis that some dust in interstellar space was largely organic, and followed this up with other research confirming the hypothesis. Wickramasinghe also proposed and confirmed the existence of polymeric compounds based on the molecule formaldehyde (H2CO). Fred Hoyle and Wickramasinghe later proposed the identification of bicyclic aromatic compounds from an analysis of the ultraviolet extinction absorption at 2175A., thus demonstrating the existence of polycyclic aromatic hydrocarbon molecules in space.
Sources: en.wikipedia.org
To get more control on the regiospecific polymer synthesis, copolymerization was proposed. One of these methods is introducing the precursor polymer made from copolymerization of VF2 with either 1-chloro-2,2-difluoroethylene (CVF2) or 1-bromo-2,2-difluoroethylene (BVF2). The chlorinated or brominated monomers are attacked at their CF2 carbon by growing –CH2CF2∙ radical. After reductive dechlorination or debromination with tri-n-butyltin hydride they become a reversed VF2 unit in the final polymer. Therefore, a regioisomer of PVDF is formed.
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==== Gene Microarrays ==== Traditionally DNA microarrays use complementary DNA or oligonucleotide probes to analyze messenger RNA (mRNA) from genes of interest. Extracted total RNA serves as a template for complementary DNA (cDNA) that is tagged with fluorescent probes before being allowed to hybridize to the microarray for visualization. For proteases, specific probes for protease genes and their inhibitors have been developed to view expression patterns on the mRNA transcript level. The two platforms currently available for this purpose come from corporate and academic sources. Affymetrix's Hu/Mu ProtIn Microarray uses 516 and 456 probe sets to evaluate human and murine proteases, inhibitors, and interactors respectively. CLIP-CHIP™, developed by the Overall Lab, is a complete protease and inhibitor DNA microarray for all 1561 human and murine proteases, non-proteolytic homologues, and their inhibitors. Both of these tools allow comparison of expression patterns between normal and diseased samples and tissues. Unfortunately, as transcript levels often fail to reflect protein expression levels, gene microarrays are limited in representing protein in samples. In addition, proteases recruited from remote sources like nearby tissues are ignored by these DNA based arrays, reiterating the need for protein based methods to confirm the presence and activity of functional enzymes when transcriptome analysis is performed.
Sources: en.wikipedia.org
Liquid chromatography with mass spectrometry is a common approach. Ultraviolet detection and nuclear magnetic resonance can support identification when suitable standards are available.
The solid is generally kept cold, dry, and protected from light. Solutions are often frozen in single-use aliquots to reduce repeated freeze-thaw cycles.
It indicates a material sold for laboratory study, not for human use. The label does not guarantee pharmaceutical purity, sterility, or regulatory approval.
It is a synthetic research compound that activates REV-ERB nuclear receptors. It is not an approved drug or dietary supplement. Most information comes from cell and animal studies.