The short version of circadian clock fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2025-12-09. Anything still debated is marked as such rather than presented as settled.
SR9009 stability depends on temperature, moisture, light, and solvent. Solid material is generally kept cool and dry, while solutions may require protection from repeated warming and cooling. Degradation can appear as color changes, precipitate, or new chromatographic peaks. Researchers should follow supplier instructions and their own stability data. Long-term storage conditions for human use have not been established because the compound lacks approved clinical formulation.
SR9009 is supplied as a solid research chemical, often in milligram quantities. Laboratories typically weigh it in a controlled environment because fine powders can disperse. Stock solutions are commonly prepared in dimethyl sulfoxide and stored in small aliquots to reduce freeze-thaw cycles. Personal protective equipment and chemical fume hoods are standard when handling unknown or potent compounds. These practices address laboratory safety rather than human use.
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 |
|---|---|---|
| Synonyms | SR9009; Stenabolic | Stenabolic is an informal name |
| Common form | Crystalline powder | Supplied in milligram to gram quantities |
| Long-term storage | -20 °C, desiccated, protected from light | Reduces degradation |
| Detection technique | LC-MS/MS | Common in anti-doping and research analysis |
| Regulatory status | Prohibited in sport by WADA | Not approved for human therapeutic use |
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. 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.
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.
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.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. It is not an approved medicine and has no established human therapeutic use. The compound appears in scientific literature as a tool for probing circadian and metabolic regulation. Online sellers often label it as a research chemical, sometimes using the nickname Stenabolic. Its chemical identity is distinct from selective androgen receptor modulators, stimulants, and peroxisome proliferator-activated receptor delta agonists. Researchers use it mainly in cell and animal experiments.
At the molecular level, SR9009 binds REV-ERBα and REV-ERBβ and alters their repressive activity on target genes. These nuclear receptors help regulate the circadian clock, lipid synthesis, glucose metabolism, and inflammatory pathways. By changing transcription, the compound can shift the timing or magnitude of downstream metabolic processes in model systems. It does not act through androgen receptors or adenosine receptors, which distinguishes it from several substances sold for athletic performance. Whether the same transcriptional changes occur in humans at tolerable exposures remains an open question because controlled human studies are lacking.
Venom is found in some 200 cartilaginous fishes, including stingrays, sharks, and chimaeras; the catfishes (about 1,000 venomous species); and 11 clades of spiny-rayed fishes (Acanthomorpha), containing the scorpionfishes (over 300 species), stonefishes (over 80 species), gurnard perches, blennies, rabbitfishes, surgeonfishes, some velvetfishes, some toadfishes, coral crouchers, red velvetfishes, scats, rockfishes, deepwater scorpionfishes, waspfishes, weevers, and stargazers.
In late 2012, a yellow fever outbreak occurred in the Darfur region of Sudan that was the largest yellow fever epidemic to strike Africa in two decades. On 10 January 2013, the Sudan Federal Ministry of Health and the World Health Organization (WHO) reported that there had been 847 suspected cases since 2 September 2012, including 171 deaths, for an estimated case fatality rate of 20%. A mass vaccination campaign was launched in mid-November. By early January, the five states of Darfur were free of any new cases.
Being zero-dimensional, quantum dots have a sharper density of states than higher-dimensional structures. As a result, they have superior transport and optical properties. They have potential uses in diode lasers, amplifiers, and biological sensors. Quantum dots may be excited within a locally enhanced electromagnetic field produced by gold nanoparticles, which then can be observed from the surface plasmon resonance in the photoluminescent excitation spectrum of (CdSe)ZnS nanocrystals. High-quality quantum dots are well suited for optical encoding and multiplexing applications due to their broad excitation profiles and narrow/symmetric emission spectra. The new generations of quantum dots have far-reaching potential for the study of intracellular processes at the single-molecule level, high-resolution cellular imaging, long-term in vivo observation of cell trafficking, tumor targeting, and diagnostics. CdSe nanocrystals are efficient triplet photosensitizers. Laser excitation of small CdSe nanoparticles enables the extraction of the excited state energy from the quantum dots into bulk solution, thus opening the door to a wide range of potential applications such as photodynamic therapy, photovoltaic devices, molecular electronics, and catalysis.
- Filomena Teixeira, 2019Teixeira called hospitals, traveled abroad many times, in one of those times she had to be hospitalized after seeing pedophilic material, searching for a lead of a boy in Switzerland. When failures in the investigation were highlighted in court, Teixeira said "it served to prove that I was saying the truth. For 13 years, I got called crazy, and now, after all this time, the come to tell me I was right: after all, I wasn't crazy, I was right. (...) I was said that they were going the wrong way, that they weren't looking, that they weren't doing anything..." Ricardo Sá Fernandes said that "we were shocked with what was said in court today, we were aware since the first moment that the inspectors knew about the prostitute Alcina Dias. They never heard her formally and justified it as forgetfulness." Manuel Mendonça believed that Dias could say something about Mendonça when in jail, since he got to choose and be put in a jail that looked like an "hotel" (when compared to the others).
While some forms of aquaculture can be devastating to ecosystems, such as shrimp farming in mangroves, other forms can be beneficial. Shellfish aquaculture adds substantial filter feeding capacity to an environment which can significantly improve water quality. A single oyster can filter 15 gallons of water a day, removing microscopic algal cells. By removing these cells, shellfish are removing nitrogen and other nutrients from the system and either retaining it or releasing it as waste which sinks to the bottom. By harvesting these shellfish, the nitrogen they retained is completely removed from the system. Raising and harvesting kelp and other macroalgae directly remove nutrients such as nitrogen and phosphorus. Repackaging these nutrients can relieve eutrophic, or nutrient-rich, conditions known for their low dissolved oxygen which can decimate species diversity and abundance of marine life. Removing algal cells from the water also increases light penetration, allowing plants such as eelgrass to reestablish themselves and further increase oxygen levels. Aquaculture in an area can provide for crucial ecological functions for the inhabitants. Shellfish beds or cages can provide habitat structure. This structure can be used as shelter by invertebrates, small fish or crustaceans to potentially increase their abundance and maintain biodiversity. Increased shelter raises stocks of prey fish and small crustaceans by increasing recruitment opportunities in turn providing more prey for higher trophic levels.
Sources: en.wikipedia.org
The Fifth Coalition (1809) of Britain and Austria against France formed as Britain engaged in the Peninsular War in Spain and Portugal. The sea became a major theatre of war against Napoleon's allies. Austria, previously an ally of France, took the opportunity to attempt to restore its imperial territories in Germany as held prior to Austerlitz. During the time of the Fifth Coalition, the Royal Navy won a succession of victories in the French colonies. On land the major battles included Battles of Raszyn, Eckmuhl, Raab, Aspern-Essling, and Wagram. On land, the Fifth Coalition attempted few extensive military endeavours. One, the Walcheren Expedition of 1809, involved a dual effort by the British Army and the Royal Navy to relieve Austrian forces under intense French pressure. It ended in disaster after the Army commander, John Pitt, 2nd Earl of Chatham, failed to capture the objective, the naval base of French-controlled Antwerp. For the most part of the years of the Fifth Coalition, British military operations on land (apart from the Iberian Peninsula) remained restricted to hit-and-run operations executed by the Royal Navy, which dominated the sea after having beaten down almost all substantial naval opposition from France and its allies and blockading what remained of France's naval forces in heavily fortified French-controlled ports. These rapid-attack operations were aimed mostly at destroying blockaded French naval and mercantile shipping and the disruption of French supplies, communications, and military units stationed near the coasts.
Many soluble salts of acid dyes synthesized for textile-related purposes were transformed into insoluble salts or lake pigments by reaction with water-soluble salts of calcium, barium or lead, whereas basic dyes were treated with tannins or antimony potassium tartrate to yield pigments.
In it Adorno not only deviated from the theoretical program Horkheimer had laid out a year earlier but also challenged philosophy's very capacity for comprehending reality as such: "For the mind," Adorno announced, "is indeed not capable of producing or grasping the totality of the real, but it may be possible to penetrate the detail, to explode in miniature the mass of merely existing reality." In line with Benjamin's The Origin of German Tragic Drama and preliminary sketches of the Arcades Project, Adorno likened philosophical interpretation to experiments that should be conducted "until they arrive at figurations in which the answers are legible, while the questions themselves vanish." Having lost its position as the Queen of the Sciences, philosophy must now radically transform its approach to objects so that it might "construct keys before which reality springs open." Following Horkheimer's taking up the directorship of the Institute, a new journal, Zeitschrift für Sozialforschung, was produced to publish the research of Institute members both before and after its relocation to the United States. Though Adorno was not an Institute member, the journal published many of his essays, including "The Social Situation of Music" (1932), "On Jazz" (1936), "On the Fetish-Character in Music and the Regression of Listening" (1938), and "Fragments on Wagner" (1938).
== External links == Wood Library-Museum of Anesthesiology The most comprehensive educational, scientific and archival resources in anesthesiology. "Chloroform: The molecular lifesaver" An article at University of Bristol providing interesting facts about chloroform. Australian & New Zealand College of Anaesthetists Monitoring Standard Royal College of Anaesthetists Patient Information page Turning the Pages: a virtual reconstruction of Hanaoka's Surgical Casebook, c. 1825. From the U.S. National Library of Medicine (in German) Die Geschichte der Anästhesie. "Anesthesia as a specialty: Past, present and future" Presentation by Prof. Janusz Andres.
Sources: en.wikipedia.org
=== United States === In May 2020, the company announced their plans to open 350 restaurants in the United States, with their first to be in New Jersey. As of October 2023, the company has since opened nine restaurants within the US. GDK opened their first US restaurant at American Dream in New Jersey in October 2021. In January 2025, German Doner Kebab (GDK) launched its first U.S. advertising campaign titled "Open Your Mouth Mind." The campaign, created by agency Quality Meats, uses quirky visuals and humor to introduce American audiences to GDK’s modern take on the traditional kebab.
=== Huaren and Huayi === Prior to the Han dynasty, Chinese scholars used the term Huaxia (華夏; 华夏) in texts to describe China proper, while the Chinese populace were referred to as either the 'various Hua' (諸華; 诸华; Zhūhuá) or 'various Xia' (诸夏; 諸夏; Zhūxià). This gave rise to two term commonly used nowadays by Overseas Chinese as an ethnic identity for the Chinese diaspora – Huaren (華人; 华人; Huárén; 'ethnic Chinese people') and Huaqiao (华侨; 華僑; Huáqiáo; 'the Chinese immigrant'), meaning Overseas Chinese. It has also given rise to the literary name for China – Zhonghua (中華; 中华; Zhōnghuá). While the general term Zhongguo ren (中國人; 中国人) refers to any Chinese citizen or Chinese national regardless of their ethnic origins and does not necessary imply Han ancestry, the term huaren in its narrow, classical usages implies Central Plains or Han ancestry.
== Selection of Escherichia coli == Puromycin is poorly active on E. coli. Puromycin-resistant transformants are selected in LB agar medium supplemented with 125 μg/mL of puromycin. But use of puromycin for E. coli selection requires precise pH adjustment and also depends on which strain is selected. For hassle–free selection and optimum results the use of specially modified puromycin is possible. Plates containing puromycin are stable for 1 month when stored at 4 °C.
Sources: en.wikipedia.org
Laboratories commonly use liquid chromatography coupled with mass spectrometry to detect SR9009. The method can identify the compound and estimate concentration in a sample. Detection limits depend on the matrix and instrument.
Research-grade purity indicates a supplier's measured percentage of the intended compound. It does not guarantee safety, sterility, or suitability for human consumption. Buyers should request a certificate of analysis with chromatograms and test methods.
Sports regulators prohibit SR9009 because it is a non-approved substance with potential performance-altering effects. Its presence can be detected in anti-doping testing. Athletes are responsible for substances found in their samples.
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.