This is a working overview of LC-MS/MS, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-08-20. Anything still debated is marked as such rather than presented as settled.
SR9009 is a synthetic small molecule that acts on the nuclear receptors REV-ERBα and REV-ERBβ. These receptors are part of the circadian clock machinery and normally repress transcription of certain target genes. In laboratory research, SR9009 is used as a chemical tool to study how REV-ERB activity influences metabolism, inflammation, and daily biological rhythms. The compound is not an approved medicine, and its effects in humans remain largely uncharacterized. It is often described as an investigational agent rather than a therapeutic product.
REV-ERB proteins typically suppress gene expression by recruiting corepressor complexes to DNA response elements. SR9009 binds these receptors and strengthens that repressive action in cell-based assays. Studies in rodents have reported changes in lipid handling, mitochondrial function, and exercise capacity after treatment. Such findings are often cited as evidence for metabolic effects, but species differences and limited pharmacokinetic data make direct translation to humans uncertain. Researchers continue to examine which effects are robust and which depend on specific experimental conditions.
SR9009 is frequently discussed alongside other REV-ERB ligands, including synthetic agonists and natural heme-related molecules. Its selectivity for REV-ERB over related nuclear receptors has been measured in binding and reporter assays, though off-target activity at higher concentrations is possible. The compound is prohibited in sport by the World Anti-Doping Agency, and it is not approved for any medical use in major jurisdictions. Products sold online may be labeled as research chemicals, and their identity and purity are not guaranteed by regulatory review.
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.
| Property | Value | Notes |
|---|---|---|
| Common name | SR9009 | Also marketed informally as Stenabolic |
| Chemical class | Synthetic REV-ERB agonist | Binds REV-ERBα and REV-ERBβ |
| Molecular formula | C24H30ClN3O4S | Approximate molecular weight 492 g/mol |
| CAS Registry Number | 1379686-30-2 | Identifier for the parent compound |
| Regulatory status | Not approved for human use | Prohibited in sport by WADA |
Detection of SR9009 in biological samples usually relies on liquid chromatography coupled to tandem mass spectrometry. This approach separates the compound from matrix components and identifies it by mass transitions. Because SR9009 can undergo metabolism, laboratories often look for both parent drug and specific metabolites. Sample preparation may involve protein precipitation or solid-phase extraction. Method validation examines sensitivity, carryover, and interference from related substances, and reference standards are required for accurate calibration.
Storage recommendations for SR9009 reference material typically specify a freezer at -20 °C or lower, with protection from moisture and light. Repeated freeze-thaw cycles can degrade small molecules and introduce variability. Stock solutions in dimethyl sulfoxide are often aliquoted to avoid repeated handling. Stability studies may examine degradation under heat, humidity, and light exposure. The compound's thiophene and nitro groups can participate in reactions that alter analytical signals over time, so such changes affect quantitative results.
Quality control for research materials includes identity confirmation by nuclear magnetic resonance and purity assessment by high-performance liquid chromatography. Mass spectrometry provides molecular weight confirmation and can detect related impurities. Purchasers should request a certificate of analysis that lists lot-specific data. Online products advertised for human use often lack such documentation. Distinguishing legitimate research material from mislabeled or contaminated samples is a recurring challenge in independent testing, and independent laboratories may use orthogonal methods to verify identity.
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.
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.
Hart had a guest appearance in the 2002 sitcom, Undeclared. He made his film debut in the 2002 film Paper Soldiers. Hart then had other film roles such as the Scary Movie franchise, Soul Plane, The 40-Year-Old Virgin, Death at a Funeral and Little Fockers. He turned down a role in the 2008 film Tropic Thunder because the character is gay, citing his own "insecurities". He played Doug in the film The Five-Year Engagement (2012) and appeared in Think Like a Man which was a box office success. He also appeared in the sequel. He had a cameo as himself in This Is the End. In 2013, Hart played a boxing promoter in Grudge Match and appeared in Exit Strategy as Mannequin Head Man. He also appeared in 35 and Ticking. In 2013, Hart co-created Real Husbands of Hollywood with Chris Spencer. The show follows Hart along with other married celebrities (each playing a comical fictionalized version of themselves) within the series including: Boris Kodjoe, Nelly, Duane Martin, J. B. Smoove, Nick Cannon and Robin Thicke. Thicke did not return for the second season due to his music career, though Hart has stated that the door is open for him to return. The series is filmed in a style similar to Bravo's The Real Housewives. Episodes often hinge on the "real" Hart's desperately unsuccessful attempts to climb Hollywood's celebrity social ladder (which always backfire in humiliating ways), and the character's barely-hidden envy of his more successful celebrity friends. A sneak peek was shown as a segment during the 2012 BET Awards and the official promo was released in October 2012.
Regenerative pumps utilize vortex behavior of the fluid (air). The construction is based on hybrid concept of centrifugal pump and turbopump. Usually it consists of several sets of perpendicular teeth on the rotor circulating air molecules inside stationary hollow grooves like multistage centrifugal pump. They can reach to 1×10−5 mbar (0.001 Pa) (when combining with Holweck pump) and directly exhaust to atmospheric pressure. Examples of such pumps are Edwards EPX (technical paper ) and Pfeiffer OnTool™ Booster 150. It is sometimes referred as side channel pump. Due to high pumping rate from atmosphere to high vacuum and less contamination since bearing can be installed at exhaust side, this type of pumps are used in load lock in semiconductor manufacturing processes. This type of pump suffers from high power consumption (~1 kW) compared to turbomolecular pump (<100W) at low pressure since most power is consumed to back atmospheric pressure. This can be reduced by nearly 10 times by backing with a small pump.
=== EC 2.7.9: Phosphotransferases with paired acceptors (dikinases) === EC 2.7.9.1: pyruvate, phosphate dikinase EC 2.7.9.2: pyruvate, water dikinase EC 2.7.9.3: selenide, water dikinase EC 2.7.9.4: α-glucan, water dikinase EC 2.7.9.5: phosphoglucan, water dikinase EC 2.7.9.6: rifampicin phosphotransferase
The LSI is a 235,000 square feet building with six floors, located between U-M's central campus and the university's medical campus in Ann Arbor. Completed in 2003, the building includes housing for wet lab and laboratory support spaces, administration offices, PI offices, interaction spaces, core laboratory areas, a combined gallery/lobby space and a small library. The exterior design of the building is intended to harmonize with other campus loft-style structures, while also meeting the needs of a modern research institute.
Sources: en.wikipedia.org
=== Plant-based medications === There has been a number of alternative therapies experimented in ayurvedic medicine with plant-based products, although none have provided good evidence of efficacy. A recent study showed that the stromal processing peptidase (SPP), a synthetic enzyme found in plant chloroplasts, prevented the aggregation of proteins associated with Huntington's disease. However, repeat studies and clinical validation are needed to confirm its true therapeutic potential.
=== Myelography === For patients with recalcitrant spontaneous intracranial hypotension and no leak found on conventional spinal imaging, digital subtraction myelography, CT myelography and dynamic myelography (a modified conventional myelography technique) should be considered to rule out a CSF-venous fistula. In addition, presence of a hyperdense paraspinal vein should be investigated in imaging as it is highly suggestive of a CSF venous fistula.
=== Creatine === In the 1970s, Daly began studying the uptake of creatine by muscle cells, an important research topic in the energy recycling systems of muscle. Her "Uptake of Creatine by Cultured Cells" (1980) described the conditions under which muscle tissues best absorbed creatine.
Sources: en.wikipedia.org
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2 July Democratic senator George McGovern stated that he met with North Vietnamese and VC negotiators in Paris in May and that productive negotiations would not occur without the start of unconditional U.S. withdrawal and distancing from the South Vietnamese government.
the duration is at least a year; it is in writing and signed by both parties; it specifies aggregate payment which is set in advance; payment is reasonable and fair market value; payment does not relate to volume or value of business; the exact services to be performed are outlined; and the contract is commercially reasonable. Because current processes for monitoring contract compliance and logging physician work hours are often done on paper, the majority of Stark Law violation settlements are the result of technical violations. Healthcare experts agree that information technology is necessary to streamline hospital processes, including those relating to compliance and Stark Law. Certain electronic health record companies help healthcare systems collect, organize, and store data. Multiple technology solutions exist that specifically automate physician time logging and eliminates Stark Law violation risk.
Sources: en.wikipedia.org
SR9009 is a synthetic research compound that binds and modulates the nuclear receptors REV-ERBα and REV-ERBβ. It is used in laboratory studies of circadian biology and metabolism, not as an approved medicine. It is also known by the informal name Stenabolic.
No. SR9009 has not been approved as a therapeutic drug in the United States, European Union, or other major markets. Human safety and efficacy data are very limited. Its presence in consumer products does not imply regulatory approval.
The World Anti-Doping Agency lists SR9009 as a prohibited substance because it can alter gene expression and metabolic pathways relevant to performance. The ban applies at all times, not only during competition. Detection relies on laboratory methods such as mass spectrometry.
Liquid chromatography with mass spectrometry is a common approach. Ultraviolet detection and nuclear magnetic resonance can support identification when suitable standards are available.