circadian rhythm is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2025-10-26. Numbers and descriptions here follow the published literature rather than marketing 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.
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.
Storage conditions for research-grade SR9009 generally involve a freezer at approximately minus twenty degrees Celsius, sometimes lower for long-term preservation. Containers should remain tightly closed and protected from light. Desiccants may be used to limit moisture uptake. Solutions are often stored in aliquots to avoid repeated warming and cooling. Stability data for the compound under various conditions are limited, so laboratories typically follow supplier recommendations and verify performance through periodic analytical checks rather than assuming indefinite stability.
Identity and purity testing for SR9009 commonly uses liquid chromatography coupled with tandem mass spectrometry. This method separates the compound from matrix components and detects it by mass-to-charge transitions, providing sensitive and specific confirmation. Nuclear magnetic resonance spectroscopy can support structural identification, while high-performance liquid chromatography with ultraviolet detection may estimate purity. Because online products labeled as SR9009 may contain other substances or no active compound at all, independent verification is important in research settings. Certificates of analysis are useful but not a substitute for in-house testing.
| 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. |
Laboratory studies often administer SR9009 by injection because oral absorption appears poor in rodents. Reported pharmacokinetic properties include rapid metabolism and low systemic exposure after oral dosing. Human pharmacokinetic data are sparse, so absorption, distribution, metabolism, and excretion in people are not well defined. Some research explores related REV-ERB compounds with improved drug-like properties. Regulatory approval for any REV-ERB agonist as a human medicine has not been granted to date.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ, also called NR1D1 and NR1D2. These receptors help regulate circadian rhythms and metabolic gene programs. The compound was developed for laboratory research, not as an approved therapeutic. Its identity is distinct from steroid hormones and selective androgen receptor modulators. Scientific interest centers on how REV-ERB activation changes gene expression in cells and animal models.
== Further reading == Ortsfamilienbücher. In: Wolfgang Ribbe, Eckart Henning: Taschenbuch für Familiengeschichtsforschung. 12th edition. Degener, Neustadt/Aisch 2001, pp. 306–340, ISBN 3-7686-1062-4 Janet Few, Ten Steps to a One-Place Study, Blue Poppy Publishing 2020, ISBN 978-1911438182
== Interactions == Actin beta has been shown to interact with SPTBN2. In addition, RNA-binding protein Sam68 was found to interact with the mRNA encoding actin beta, which regulates the synaptic formation of the dendritic spines with its cytoskeletal components. Actin beta has been shown to activate eNOS, thereby increasing NO production. An eight-amino acid motif (326-333) in eNOS has been shown to mediate the interaction between actin and eNOS.
==== Absorption ==== The oral bioavailability of LSD was crudely estimated as approximately 71% using previous data on intravenous administration of LSD. The sample was equally divided between male and female subjects. There were no significant sex differences observed in the pharmacokinetics of LSD. In a subsequent higher-quality 2025 study, the oral bioavailability of LSD was about 80%. The pharmacokinetics of LSD were not properly determined until 2015, which is not surprising for a drug with the kind of low-μg potency that LSD possesses. In a sample of 16 healthy subjects, a single mid-range 200 μg oral dose of LSD was found to produce mean maximal concentrations of 4.5 ng/mL at a median of 1.5 hours (range 0.5–4 hours) post-administration. A large meal before taking LSD has been found to result in circulating levels that were 50% lower than on an empty stomach.
=== Energy Harvesting and Storage === Flow batteries – synthesizing molecules for high-energy density electrolytes and highly-selective membranes in grid-scale energy storage systems Lithium-ion batteries – creating new molecules for use as electrode binders, electrolytes, electrolyte additives, or even for energy storage directly in order to improve energy density (using materials such as graphene, silicon nanorods, and lithium metal), power density, cycle life, and safety Solar cells – developing new materials for more efficient and cost-effective solar cells including organic, quantum dot or perovskite-based photovoltaics Photocatalytic water splitting – enhancing the production of hydrogen fuel using solar energy and advanced catalytic materials such as semiconductor nanoparticles
Sources: en.wikipedia.org
== January 20, 1982 (Wednesday) == Musician Ozzy Osbourne was treated for rabies after allegedly biting the head off a live bat during a concert at Veterans Auditorium in Des Moines, Iowa. A spokesman for Broadlawn Medical Center reported that the patient registered as John M. Osbourne "was given a rabies shot and rabies vaccine and a tetanus shot as well," and that the medical report gave the history "Patient bit head off bat." Des Moines police lieutenant Derald Leaming said "I told his manager if he bit the head off any animals while he was here, he'd be arrested. We would have arrested him on the spot if we'd seen anything like that," while two other officers said that he had seen Osbourne "put a couple of birds in his mouth but he let them loose", and that although the police didn't see a bat, that they "did see raw liver on the floor." Born: Pete Buttigieg, American politician, U.S. Secretary of Transportation from 2021 to 2025, 2020 candidate for the Democratic Party nomination for U.S. president; in South Bend, Indiana Died: Marc Demeyer, 31, Belgian professional bicyclist known for winning individual stages twice in the Tour de France (1978 and 1979) and twice in the 1977 Giro d'Italia, died of a heart attack.
Cirrhosis can take quite a long time to develop, and symptoms may be slow to emerge. Some early symptoms include tiredness, weakness, loss of appetite, weight loss, and nausea. Early signs may also include redness on the palms known as palmar erythema. People may also feel discomfort in the right upper abdomen around the liver. As cirrhosis progresses, symptoms may include neurological changes affecting both the peripheral and central nervous systems, disrupting the neurotransmission within the brain and causing neuromuscular fatigue. This can consist of cognitive impairments, confusion, memory loss, sleep disorders, and personality changes. Steatorrhea or presence of undigested fats in stool is also a symptom of cirrhosis. Worsening cirrhosis can cause a build-up of fluid in different parts of the body, such as the legs (edema) and abdomen (ascites). Other signs of advancing disease include itchy skin, bruising easily, dark urine, and yellowing of the skin.
Tobacco cells exposed to gradually increased salt concentrations develop a greatly increased tolerance to salt, due to the expression of osmotin, a member of the PR protein family. Wheat plants attacked by barley powdery mildew express a PR protein (PWIR2), which results in resistance against that infection. The similarity between this PR protein and other PR proteins and the maize alpha-amylase/trypsin inhibitor has suggested that PR proteins may act as some form of inhibitor. Within West Africa, the katemfe fruit has been locally cultivated and used to flavour foods and beverages for some time. The fruit's seeds are encased in a membranous sac, or aril, that is the source of thaumatin. In the 1970s, Tate and Lyle began extracting thaumatin from the fruit. In 1990, researchers at Unilever reported the isolation and sequencing of the two principal proteins found in thaumatin, which they dubbed thaumatin I and thaumatin II. These researchers were also able to express thaumatin in genetically engineered bacteria. Thaumatin has been approved as a sweetener in the European Union (E957), Israel, and Japan. In the United States, it is generally recognized as safe as a flavouring agent (FEMA GRAS 3732) but not as a sweetener.
== Uses == Acetamide is used as a plasticizer and an industrial solvent. Molten acetamide is good solvent with a broad range of applicability. Notably, its dielectric constant is higher than most organic solvents, allowing it to dissolve inorganic compounds with solubilities closely analogous to that of water. Acetamide has uses in electrochemistry and the organic synthesis of pharmaceuticals, pesticides, and antioxidants for plastics. It is a precursor to thioacetamide.
Towards the end of the 16th century, pessaries became more common in the management of uterine prolapse, due in part to advances in anatomic knowledge of the female genitourinary tract earlier in the century. Pessaries were usually made out of wax, metal, glass, or wood. Charles Goodyear's invention of volcanized rubber in the mid-1800s made it possible to produce pessaries that would not decompose. However, even into the 1800s, alternative practices were still used, such as the use of sea-water douches, postural exercises, and leeching. Although the use of surgery in the treatment of uterine prolapse had been described previously, the 19th century saw advances in surgical techniques. During the mid to late 1800s, surgical attempts to manage uterine prolapse included narrowing the vaginal vault, suturing the perineum, and amputating the cervix. In 1877, LeFort described the process of a partial colpocleisis. In 1861, Choppin in New Orleans reported the first instance in which vaginal hysterectomy was performed for uterine prolapse. Prior to that, vaginal hysterectomies were mainly performed for malignancies. Following Alwin Mackenrodt's 1895 publication of a comprehensive description of the female pelvic floor connective tissue, Fothergill began working on the Manchester-Fothergill surgery with the belief that the cardinal and uterosacral ligaments were key support structures for the uterus. In 1907, Josef Haban and Julius Tandler theorized that the levator ani muscles were also very important for uterine support.
Sources: en.wikipedia.org
== Reactions and uses == Vinyl sulfones are dienophiles. Subsequent to the cycloaddition to a vinyl sulfone, the phenylsulfonyl group can be removed by reduction with zinc. Vinyl sulfones are Michael acceptors. Vinyl sulfones add thiols, such as cysteine residues. This same reactive nature is responsible for their major industrial use in vinyl sulfone dyes. Phenyl vinyl sulfone has been applied to ruthenium chemistry as part of olefin metathesis reactions. Vinyl sulfone has applications to protein purification, especially when linked with mercaptoethanol.
== Terminology == The term "carbohydrate" has many synonyms and the definition can depend on context. Terms associated with carbohydrate include "sugar", "saccharide", "glucan", and "glucide". In food science the term "carbohydrate" often means any food that is rich in starch (such as cereals, bread and pasta) or simple carbohydrates, or fairly simple sugars such as sucrose (found in candy, jams, and desserts). Carbohydrates can also refer to dietary fiber, like cellulose.
In coordination chemistry, a stability constant (also called formation constant or binding constant) is an equilibrium constant for the formation of a complex in solution. It is a measure of the strength of the interaction between the reagents that come together to form the complex. There are two main kinds of complex: compounds formed by the interaction of a metal ion with a ligand and supramolecular complexes, such as host–guest complexes and complexes of anions. The stability constant(s) provide(s) the information required to calculate the concentration(s) of the complex(es) in solution. There are many areas of application in chemistry, biology and medicine.
== Select research interests == Research in Cooks' laboratory (the Aston Laboratories) has contributed to a diverse assortment of areas within mass spectrometry, ranging from fundamental research to instrument and method development to applications. Cooks' research interests over the course of his career have included the study of gas-phase ion chemistry, tandem mass spectrometry, angle-resolved mass spectrometry and energy-resolved mass spectrometry (ERMS); dissociation processes, including collision-induced dissociation (CID), surface-induced dissociation (SID), and photodissociation (PD); and desorption processes, including secondary ion mass spectrometry (SIMS), laser desorption ionization (LDI) and desorption electrospray ionization (DESI). His research has ranged through areas from preparative mass spectrometry, ionization techniques and quadrupole ion traps (QITs) and related technologies to as far afield as abiogenisis (also known as "the origin of life") via homochirality.
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.
Research-grade SR9009 is typically stored frozen at about minus twenty degrees Celsius, protected from light and moisture. Stock solutions are often kept in aliquots to avoid repeated freeze-thaw cycles. Specific storage conditions should follow the supplier's documentation.