The short version of circadian clock fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-03-23. Anything still debated is marked as such rather than presented as settled.
Regulatory treatment of SR9009 varies by country and region. It is not approved as a pharmaceutical, and several jurisdictions restrict its sale for human consumption. Some authorities classify it as a research chemical, a prescription-only substance, or a prohibited performance-enhancing agent in sport. Purchasers may encounter certificates of analysis, but these documents do not guarantee identity, purity, or legality. In research settings, institutional safety reviews and controlled procurement help ensure that materials are handled under appropriate oversight. The absence of harmonized rules means that legal status can change and requires verification.
Analytical identification of SR9009 typically relies on liquid chromatography coupled with tandem mass spectrometry. In biological samples, researchers first separate the compound from matrix components using protein precipitation, liquid-liquid extraction, or solid-phase extraction. High-performance liquid chromatography with ultraviolet detection and nuclear magnetic resonance spectroscopy can support structural confirmation of reference materials. Because SR9009 is a small, relatively lipophilic molecule, reverse-phase columns and acidic mobile phases are common. Laboratories often include isotope-labeled internal standards to improve quantification and to correct for ion suppression.
Stability depends on physical form, temperature, light exposure, and solvent. Solid SR9009 is generally stored cold and dry, with protection from light to limit degradation. Dimethyl sulfoxide stocks are common for laboratory work, but repeated freeze-thaw cycles can reduce compound integrity. Aqueous solutions may be less stable than organic stocks, and the ethyl ester in the structure can be susceptible to hydrolysis under certain conditions. Researchers typically validate storage conditions and recheck purity before quantitative experiments, especially when using archived material.
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.
SR9009 is a synthetic small molecule studied as an agonist of REV-ERB nuclear receptors. REV-ERB alpha and REV-ERB beta help regulate circadian rhythms and metabolic gene expression. In laboratory research, SR9009 has been used to probe how these receptors affect skeletal muscle, liver, and adipose tissue. The compound was identified in academic drug-discovery work and is often described in scientific literature by its chemical name and research code. It is not an approved medicine, and human clinical data remain limited or absent.
| Property | Value | Notes |
|---|---|---|
| Common synonyms | SR9009; Stenabolic | Nickname is not a chemical name. |
| Typical analytical method | LC-MS/MS | Often with isotope-labeled internal standard. |
| Storage temperature | -20 °C | Desiccated and protected from light. |
| Solution stability | DMSO stock; avoid freeze-thaw | Store at -20 to -80 °C. |
| Regulatory status | Not approved; varies by country | May be restricted as research chemical. |
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 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.
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.
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.
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.
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.
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.
This deficit, approximately 15–20% lower than in nonsmokers, normalizes after about 3 months of abstinence. A 2016 study found that nicotine exposure creates long-lasting malleable circuits 7 months after the initial exposure to nicotine and 6 months after stopping its administration. Other studies suggest broader neuronal recovery, such as normalization of dopamine transporter (DAT) levels in reward centers, may extend up to 12–14 months in some cases of substance dependence affecting dopamine levels, though specific data for nicotine are limited.
=== Clinical examination === Nipple pain is a symptom with many possible causes. A thorough maternal breast and infant mouth inspection can help identify the specific cause and thus assign the appropriate treatment. A maternal nipple examination can be used to diagnose traumatic factors including nipple fissure, nipple blisters and infections with prominent symptoms. A breast biopsy detecting breast mass can diagnose for breast engorgement. If a breast mass is present, a core needle biopsy and diagnostic imaging are required for further assessment of underlying causes, including mastitis, blocked milk ducts, cancers and benign breast tumours called lactating adenoma. By checking the infant mouth, causes like tongue-tie, candidiasis and abnormal tongue motion can be diagnosed.
The United States and the Soviet Union engaged in competition vis-à-vis the arts. Cultural competition played out in Moscow, New York, London, and Paris. In 1946 America opened an exhibition called 'Advancing American Art' which gained popularity with the aims of expressing American art, in response the Soviets opened a respective exhibition showcasing Soviet Realism. The Soviets excelled at ballet and chess, the Americans at jazz and abstract expressionist paintings. The US funded its own ballet troupes, and both used ballet as political propaganda, using dance to reflect life style in the "battle for the hearts and minds of men." The defection of a premier dancer became a major coup. Chess was inexpensive enough—and the Russians always won until America unleashed Bobby Fischer. Vastly more expensive was the Space Race, as a proxy for scientific supremacy (with a technology with obvious military uses). As well when it came to sports the two countries both competed in the Olympics during the Cold War period which also created severe tension when the West boycotted the first Russian Olympics in 1980.
The Straw Hats' Jolly Roger was first used by protesters in Indonesia as early as October 2023 in Yogyakarta, during protests against the Gaza genocide. Student protesters in Indonesia begun flying the flag again in February 2025. Truck drivers began flying the Straw Hat Pirates' flag in late July 2025 to protest the prohibition of ODOL (over dimension, overload) trucks throughout several cities in Java, ongoing since 19 June 2025. The flag came into prominence during the 2025 Indonesian anti-government protests which started in the weeks leading up to Independence Day on 17 August. In July, President Prabowo Subianto had called on Indonesians to fly the red and white national flag to celebrate the 80th anniversary of the country's independence. Following the president's speech an apparel store received "thousands of orders" for the Jolly Roger flag, because "The anime reflects the injustice and inequality that Indonesians experience".
Sources: en.wikipedia.org
Nanoscale secondary ion mass spectrometry (NanoSIMS) is an analytical instrument manufactured by CAMECA which operates on the principle of secondary ion mass spectrometry. The NanoSIMS is used to acquire nanoscale resolution measurements of the elemental and isotopic composition of a sample. The NanoSIMS is able to create nanoscale maps of elemental or isotopic distribution, parallel acquisition of up to seven masses, isotopic identification, high mass resolution, subparts-per-million sensitivity with lateral resolution down to 30 nm.
=== Polymorphism and temporary market withdrawal === Ritonavir was originally dispensed as a capsule that did not require refrigeration. This contained a crystal form of ritonavir that is now called form I. However, like many drugs, crystalline ritonavir can exhibit polymorphism, i.e., the same molecule can crystallize into more than one crystal type, or polymorph, each of which contains the same repeating molecule but in different crystal packings/arrangements. The solubility and hence the bioavailability can vary in the different arrangements, and this was observed for forms I and II of ritonavir. During development—ritonavir was introduced in 1996—only the crystal form now called form I was found; however, in 1998, a lower free energy, more stable polymorph, form II, was discovered. This more stable crystal form was less soluble, which resulted in significantly lower bioavailability. The compromised oral bioavailability of the drug led to temporary removal of the oral capsule formulation from the market. As a consequence of the fact that even a trace amount of form II can result in the conversion of the more bioavailable form I into form II, the presence of form II threatened the ruin of existing supplies of the oral capsule formulation of ritonavir; and indeed, form II was found in production lines, effectively halting ritonavir production. Abbott withdrew the capsules from the market, and prescribing physicians were encouraged to switch to a Norvir suspension.
== Further reading == Martin, C. (2003). The Wilderness Chef: Gourmet Recipes for the Great Outdoors. Lyons Press Series. Globe Pequot Press. pp. 162–163. ISBN 978-1-58574-858-7. "Massey scientists' bean chips could be next big health snack". Manawatu Standard. April 3, 2015. Retrieved April 28, 2015.
At higher temperatures, the fluid starts to behave more like an ideal gas, with a more linear density/pressure relationship, as can be seen in Figure 2. For carbon dioxide at 400 K, the density increases almost linearly with pressure. Many pressurized gases are actually supercritical fluids. For example, nitrogen has a critical point of 126.2 K (−147.0 °C; −232.5 °F) and 3.4 MPa (34 bar). Therefore, nitrogen (or compressed air) in a gas cylinder above this pressure is actually a supercritical fluid. These are more often known as permanent gases. At room temperature, they are well above their critical temperature, and therefore behave as a nearly ideal gas, similar to CO2 at 400 K above. However, they cannot be liquified by mechanical pressure unless cooled below their critical temperature, requiring gravitational pressure such as within gas giants to produce a liquid or solid at high temperatures. Above the critical temperature, elevated pressures can increase the density enough that the SCF exhibits liquid-like density and behaviour. At very high pressures, an SCF can be compressed into a solid because the melting curve extends to the right of the critical point in the P/T phase diagram. While the pressure required to compress supercritical CO2 into a solid can be, depending on the temperature, as low as 570 MPa, that required to solidify supercritical water is 14,000 MPa. The Fisher–Widom line, the Widom line, or the Frenkel line are thermodynamic concepts that allow to distinguish liquid-like and gas-like states within the supercritical fluid.
Incandescent lamps are very sensitive to changes in the supply voltage. These characteristics are of great practical and economic importance. For a supply voltage V near the rated voltage of the lamp:
Sources: en.wikipedia.org
Materials science is an interdisciplinary field concerned with understanding the relationships between the structure of materials and their properties and using this knowledge to design materials for specific applications. The internal structure of a material—from atomic arrangements to microscopic features—strongly influences its mechanical, electrical, thermal, and optical behavior. In engineering practice, materials science and engineering are often described through the processing–structure–properties–performance paradigm, in which processing determines structure, structure determines properties, and properties ultimately control the performance of a material in service. The intellectual origins of materials science stem from the Age of Enlightenment, when researchers began to use analytical thinking from chemistry, physics, and engineering to understand ancient, phenomenological observations in metallurgy and mineralogy. Materials science still incorporates elements of physics, chemistry, and engineering. As such, the field was long considered by academic institutions as a sub-field of these related fields. Beginning in the 1940s, materials science began to be more widely recognized as a specific and distinct field of science and engineering, and major technical universities around the world created dedicated schools for its study. By studying how the history of a material (processing) influences its structure, properties, and performance, materials scientists have made many contributions to new technologies in biomaterials, metallurgy, and nanotechnology.
=== Fluorescence === Progress in molecular biology over the last six decades has produced powerful tools that facilitate the dissection of biochemical and genetic signals; yet, they tend to not be well-suited for bioelectric studies in vivo. Prior work relied extensively on current applied directly by electrodes, reinvigorated by significant recent advances in materials science and extracellular current measurements, facilitated by sophisticated self-referencing electrode systems. While electrode applications for manipulating neuraly-controlled body processes have recently attracted much attention, there are other opportunities for controlling somatic processes, as most cell types are electrically active and respond to ionic signals from themselves and their neighbors. In the early part of the 21st century, a number of new molecular techniques were developed that allowed bioelectric pathways to be investigated with a high degree of mechanistic resolution, and to be linked to canonical molecular cascades. These include:
For three years, there was an indecisive struggle between the heterogeneous Assembly and the president, who was silently awaiting his opportunity. He chose as his ministers men with little inclination towards republicanism, with a preference for Orléanists, the chief of whom was Odilon Barrot. In order to strengthen his position, he endeavoured to conciliate the reactionary parties, without committing himself to any of them. The chief instance of this was the expedition to Rome voted by the Catholics, to restore the temporal authority of Pope Pius IX, who had fled Rome in fear of the nationalists and republicans. (Garibaldi and Mazzini had been elected to a Constitutional Assembly.) The pope called for international intervention to restore him in his temporal power. The French president moved to establish the power and prestige of France against that of Austria, as beginning the work of European renovation and reconstruction which he already looked upon as his mission. French troops under Oudinot marched into Rome. This provoked an insurrection in Paris in favour of the Roman Republic, that of the Château d'Eau, which was crushed on 13 June 1849. On the other hand, when the pope, though only just restored, began to yield to the general movement of reaction, the president demanded that he should set up a Liberal government. The pope's dilatory reply having been accepted by the French ministry, the president replaced it on 1 November, by the Fould-Rocher cabinet.
=== Physical measures === There is not enough evidence to determine the effectiveness of massage therapy. The evidence for manual therapy is inconclusive. A 2015 review indicated that aquatic therapy is safe, effective, and can be an adjunct therapy for knee osteoarthritis. Among people with hip and knee osteoarthritis, water exercise may reduce pain and disability, and increase quality of life in the short term. Hydrotherapy might also be an advantage in the management of pain, disability, and quality of life. Functional, gait, and balance training have been recommended to address impairments of position sense, balance, and strength in individuals with lower extremity arthritis, as these can contribute to a higher rate of falls in older individuals. For people with hand osteoarthritis, exercises may provide small benefits for improving hand function, reducing pain, and relieving finger joint stiffness. A study showed that there is low-quality evidence that weak knee extensor muscles increase the risk of knee osteoarthritis. Strengthening of the knee extensors could prevent knee osteoarthritis. Lateral wedge insoles and neutral insoles do not appear to be useful in osteoarthritis of the knee. Knee braces may help, but their usefulness has also been disputed.
=== Computing === Hyperlink, from one electronic document to another link (Unix), a command-line program to link directory entries <link>, a type of HTML element Link, in a linked list Linker (computing), a program which converts object files to an executable Links (web browser) Microsoft Office Assistant Links, an animated cat Link layer in computer networking ln (Unix), a command-line program to create a link to a file Chainlink (blockchain), a cryptocurrency Link, an Internet wallet service from Stripe, Inc.
Sources: en.wikipedia.org
The most common approach is liquid chromatography-tandem mass spectrometry, often after extraction from blood, urine, or tissue. Ultraviolet detection and nuclear magnetic resonance spectroscopy are used mainly for reference material characterization. Isotope-labeled internal standards improve accuracy.
Solid material is usually kept at -20 °C, desiccated, and protected from light. Dimethyl sulfoxide stocks should be stored cold and subjected to minimal freeze-thaw cycles. Aqueous solutions are generally less stable and should be prepared fresh when possible.
Legality depends on the country and the intended use. It is not an approved medicine, and some places restrict or ban sales for human consumption. Buyers should verify local rules and product documentation before procurement.
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.