If you have been reading about research chemical and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2026-05-31. Where a claim depends on a specific study, the study is described rather than over-claimed.
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 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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Not approved for human use | Research-use-only status in many markets |
| WADA status | Prohibited in sport | Generally listed as a non-approved substance |
| Detection technique | LC-MS/MS | Common for urine and blood analysis |
| Common alias | Stenabolic | Informal market nickname, not a pharmacopoeial name |
| Purity check | HPLC or LC-UV | Independent certificate of analysis is typical |
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.
The use of gas turbines to blast a large volume of high velocity water proved popular with firefighters for stubborn fires. A Hungarian team used a converted T-34 tank with two MiG-21 engines mounted to the turret to extinguish 9 fires in 43 days. The machine was known as Big Wind. In fighting a fire at a directly vertical spewing wellhead, high explosives, such as dynamite were used to create a blast wave that pushes the burning fuel and local atmospheric oxygen away from the well. (This is a similar principle to blowing out a candle.) The flame is removed and the fuel can continue to spill out without igniting. Generally, explosives were placed within 55 gallon drums, the explosives surrounded by fire retardant chemicals, and then the drums are wrapped with insulating material with a horizontal crane being used to bring the drum as close to the burning area as possible. The firefighting teams titled their occupation as "Operation Desert Hell" after Operation Desert Storm.
==== Detection ==== Cabbage loopers possess olfactory receptor neurons on their antennae for detecting pheromones. The neurons are specifically located on two sensory structures called sensilla that differ in length and pore density. Male loopers have two types of neurons, and depending on which sensilla that are present, the neurons will detect female pheromones at varying sensitivities to each of the six pheromones. The neurons are most sensitive to the main component of the female pheromone blend, cis-7-dodecenyl acetate, and the male inhibitory signal, cis-7-dodecenol. The presence of cis-7-dodecenyl acetate is crucial for male response to female pheromones, as it is 80% of the entire blend. The base region of the antennae, where receptor neurons for this pheromone are located, has more sensory structures than the ends. The base region is also less likely to experience damage, showing the importance of detecting the pheromone. It is not clear why male neurons detect the inhibitory compound, as there is no evidence showing that females produce this compound. One possibility is that its presence in the female pheromone blend may be too small to be detected by scientific equipment. The inhibitory signal only elicits a response when delivered alongside female pheromones to avoid mixing signals from other species, suggesting that while it cannot be detected in the female pheromone blend, it has an important role in female detection. These neurons are also capable of recognizing and responding to cis-7-tetradecenyl acetate and cis-9-tetradecenyl acetate.
Multiple Republican-led administrations removed voters from their states' voter rolls in the lead up to the election, which critics argued violates the National Voter Registration Act. In July 2024, 160,000 inactive or infrequent voters were removed from Ohio's voter rolls. The Ohio chapters of Common Cause and the League of Women Voters threatened lawsuits against the state over the purge. In August 2024, Governor Glenn Youngkin of Virginia signed an executive order removing 6,303 voters suspected of being non-citizens from Virginia's voter rolls. In October 2024, the U.S. Department of Justice sued the Virginia Board of Elections and Virginia commissioner of elections over the voter purge, alleging that it violated the National Voter Registration Act. The suit also found a number of alleged non-citizens purged were actually citizens. District judge Patricia Tolliver Giles ruled that the removal was illegal, ordering the state to stop purging voter rolls and to restore the voter registration of more than 1,600 voters who had been removed. The 4th Circuit Court of Appeals then upheld the order. The administration filed an emergency appeal to the U.S. Supreme Court, which sided with Virginia in a 6–3 decision along ideological lines, allowing the state to continue purging voter rolls. In August 2024, Alabama Secretary of State Wes Allen announced a process for purging 3,251 registered Alabama voters and referred them to the state attorney general's office for criminal prosecution.
In contrast, each Theater Command is intended to function as a unified entity with joint operations across different military branches. The PLA on 1 August 2017 marked its 90th anniversary. Before the big anniversary it mounted its biggest parade yet and the first outside of Beijing, held in the Zhurihe Training Base in the Northern Theater Command (within the Inner Mongolia Autonomous Region). In December 2023, Reuters reported a military leadership purge after high-ranking generals were ousted from the National People's Congress. Prior to 2017, over sixty generals were investigated and sacked.
Sources: en.wikipedia.org
== Amino acid pKa values == pKa values of amino acid side chains play an important role in defining the pH-dependent characteristics of a protein. The pH-dependence of the activity displayed by enzymes and the pH-dependence of protein stability, for example, are properties that are determined by the pKa values of amino acid side chains. The pKa values of an amino acid side chain in solution is typically inferred from the pKa values of model compounds (compounds that are similar to the side chains of amino acids). See Amino acid for the pKa values of all amino acid side chains inferred in such a way. There are also numerous experimental studies that have yielded such values, for example by use of NMR spectroscopy. The table below lists the model pKa values that are often used in a protein pKa calculation, and contains a third column based on protein studies.
The lawsuit continued to the Supreme Court after Schmitt left the office of attorney general. In Biden v. Nebraska, the Court held that the United States Secretary of Education lacked the authority to waive student loans.
Normally, joint cartilages have proteoglycan complexes, which are proteins with side chains made of glycosaminoglycans such as keratan sulfate and chondroitin sulfate attached to strands of hyaluronic acid. The glycosaminoglycan side chains are polyanionic, which causes adjacent side chains to push each other away and create a "bottle brush", where hyaluronic acid is the stem and the side chains are the bristles. When pressure is exerted on the joint, fluids move between the chondrocytes and synovial fluid, exchanging nutrients. In degenerative joint disease, the proteoglycan complexes start disappearing, and the hyaluronate becomes poorer in quality and scarcer. This lowers the viscosity of the synovial fluid (which increases friction) and causes white blood cells and enzymes to enter and effect cartilage degradation and inflammation. Steroids that are released as a result kill the chondrocytes. The remaining chondrocytes have trouble exchanging nutrients with the synovial fluid, which would allow them to repair some damages. The mechanism of PSGAG in vivo is based on observations and studies in vitro. PSGAG inhibits many of the catabolic enzymes that degrade cartilage, proteoglycans, and hyaluronic acid. The enzymes that are inhibited include serine proteases, which play a role in the IL-1 degradation of proteoglycans and collagen; lysosomal enzymes that cause proteoglycans to dissociate from hyaluronic acid; elastase; metalloproteinases such as stromelysin, which degrade cartilage matrix proteins; collagenases such as cathepsin B1; and hyaluronidase.
Sources: en.wikipedia.org
Legality depends on the country and the intended use. In many places it is not approved as a medicine and may be sold only as a research chemical. Importation or possession can be restricted, and sports organizations prohibit it.
Anti-doping laboratories typically use LC-MS/MS to detect SR9009 or its metabolites in urine or blood. The exact assay depends on the laboratory and the testing program. Detection can be challenging because the compound may be rapidly metabolized and present at low levels.
Stenabolic is an informal nickname used in online fitness and research-chemical markets, not an official drug name. It likely references reported effects on endurance in rodent studies. The nickname does not imply approval or proven human benefit.
It is a synthetic compound that acts as an agonist at REV-ERBα and REV-ERBβ. It is used mainly as a research chemical to study circadian and metabolic pathways. It is not approved for human therapeutic use.