REV-ERB raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2025-08-17. 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.
Identity and purity of SR9009 samples are usually checked with chromatographic and spectrometric methods. High-performance liquid chromatography can separate the compound from related impurities, while mass spectrometry provides molecular mass confirmation. Nuclear magnetic resonance spectroscopy may be used for structural verification in research settings. No single method proves biological activity, and certificates of analysis should be reviewed alongside raw data. Independent testing is often needed because online products vary widely.
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.
| 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. |
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.
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.
Pseudomonas aeruginosa produces the pigments pyocyanin and pyoverdin, which give the colonies a greenish sheen. Some specimens of Serratia marcescens produce an orange-red pigment called prodigiosin. Organisms with swarming motility, like Proteus species, exhibit concentric waves of growth extending from the inoculation point.
=== No development reported === Bupropion (Wellbutrin) – norepinephrine–dopamine reuptake inhibitor (NDRI) and nicotinic acetylcholine receptor negative allosteric modulator EX-597 (KDS-4103; ORG-231295; URB-597) – fatty acid amide hydrolase (FAAH) inhibitor Guanfacine extended-release (Connexyn; Intuniv; Intuniv XR; S-877503; SHP-503; SPD-503) – α2-adrenergic receptor agonist
== Pharmacokinetic parameters of elimination == Pharmacokinetics studies the manner and speed with which drugs and their metabolites are eliminated by the various excretory organs. This elimination will be proportional to the drug's plasmatic concentrations. In order to model these processes a working definition is required for some of the concepts related to excretion.
A recent study suggested "a multifaceted global strategy is needed to prevent substandard and falsified medicines especially in childrens, emphasizing that effective prevention requires strong regulatory enforcement, improved pharmaceutical supply chains, healthcare education, international collaboration, and access to quality medicines to reduce the associated health risks and disease burden. The study suggested two novel proposals not widely discussed before are (1) a Global Pediatric Drug Quality Index, to rank countries based on regulatory strength, testing capacity, and reporting systems for pediatric medicines, and (2) a Zero-Tolerance Supply Chain Protocol combining blockchain, community surveillance, and mini-labs to enforce transparency and prevent pediatric drug counterfeiting.
Sources: en.wikipedia.org
In 2025, CBSE decided to conduct two board examinations from the academic year 2025–26 to ease the pressure on students. CBSE has also rationalised much of the content in its syllabus after the COVID period to ease the children
==== Possible roles in pathophysiology ==== Astrocytes can transfer mitochondria into adjacent neurons to improve neuronal function. It is therefore plausible that the damage to astrocyte mitochondria seen in GP astrocytes could affect the activity of neurons. A number of hypothalamic functions show declines in aging that may be related to GP astrocytes. For example, GP astrocytes are in close contact with neurons that make a neurotransmitter called dopamine in both the rat and human hypothalamus. The dopamine produced by these neurons is carried to the nearby pituitary gland to inhibit the release of a hormone called prolactin from the pituitary. The activity of dopaminergic neurons declines during aging, leading to elevations in blood levels of prolactin that can provoke breast cancer. An aging-associated change in astrocyte function might contribute to this change in dopaminergic activity. FABP7+ astrocytes are in close contact with neurons in the arcuate nucleus of the hypothalamus that are responsive to a hormone called leptin that is produced by fat cells. Leptin-sensitive neurons regulate appetite and body weight. FABP7+ astrocytes regulate the responsiveness of these neurons to leptin. Mitochondrial damage in these astrocytes could thus alter the function of leptin-sensitive neurons and could contribute to an aging-associated dysregulation of feeding and body weight. GP astrocytes may also be involved in the hypothalamic regulation of overall glucose metabolism.
Oscar Tiegs' scientific interests and contributions ranged from the physiological analysis of nervous and muscular action to invertebrate embryology, his studies being comparable to the very best work the last century. He repeatedly turned from one area of research to another, only to return again. He was a dedicated practiser of descriptive morphology during a period when the majority of biologists were turning to experimentation. Typically, even his first research paper, was to describe something unusually interesting, namely that the male of the echiuroid worm exhibits a greater degree of degeneration than other species, the tissues fusing with those of its female partner and the host. He briefly made some helminthological investigations, for example with hookworm, and monogeneans before moving to the newly created Department of Zoology at the University of Adelaide in 1922.
=== Prevention and patient education === Early recognition and knowledge of the onset of UCTD can help patients manage and control their disease. Patients should be informed of common agents and triggers to help manage symptoms, to shorten the duration of the disease, and prevent complications.
=== Infants === Neonatal abstinence syndrome has been noted in infants born to mothers taking kratom during pregnancy. These infants display similar symptoms to infants born with opioid withdrawal syndrome, such as jitteriness, reduced feeding, irritability, and sleeplessness. Infants impacted by kratom withdrawal may require hospitalization and pharmacologic weaning using morphine. Although morphine treatment was effective in most reported cases, little is known about the best dosing and medication schedule to mitigate withdrawal symptoms. Although most affected infants in the literature were born to mothers taking daily doses of kratom, it is unknown what degree of kratom use can cause neonatal abstinence syndrome. It is recommended that mothers taking kratom work with their physician to discontinue kratom usage.
Sources: en.wikipedia.org
American folk music encompasses numerous music genres, variously known as traditional music, traditional folk music, contemporary folk music, or roots music. Many traditional songs have been sung within the same family or folk group for generations, and sometimes trace back to such origins as the British Isles, mainland Europe, or Africa. The rhythmic and lyrical styles of African-American music in particular have influenced American music. Banjos were brought to America through the slave trade. Minstrel shows incorporating the instrument into their acts led to its increased popularity and widespread production in the 19th century. The electric guitar, first invented in the 1930s, and mass-produced by the 1940s, had an enormous influence on popular music, in particular due to the development of rock and roll. The synthesizer, turntablism, and electronic music were also largely developed in the U.S. Elements from folk idioms such as the blues and old-time music were adopted and transformed into popular genres with global audiences. Jazz grew from blues and ragtime in the early 20th century, developing from the innovations and recordings of composers such as W.C. Handy and Jelly Roll Morton. Louis Armstrong and Duke Ellington increased its popularity early in the 20th century. Country music developed in the 1920s, bluegrass and rhythm and blues in the 1940s, and rock and roll in the 1950s. In the 1960s, Bob Dylan emerged from the folk revival to become one of the country's most celebrated songwriters.
=== Gas chromatography coupled to mass spectrometry (GC/MS) === Organic molecules are first extracted from rocks using solvents, capitalizing on chemical properties like the polarity of the molecules to dissolve the molecules. Usually, less than one percent of the organic material from a rock is successfully pulled out in this process, leaving behind undissolved material called kerogen. The organic-rich extract is subsequently purified using silica gel column packed chromatography – eluting the extract through the column with targeted solvents pulls out contaminants and remnant undissolved organic material, which will bind to the polar silica moieties. When the sample is then run through a gas chromatography (GC) column, the compounds separate based on their boiling points and interaction with a stationary phase within the column. The temperature ramping of a gas chromatography column can be programmed to obtain optimal separation of the compounds. After the GC, the molecules are ionized and fragmented into smaller, charged molecules. A mass spectrometer then separates the individual compounds based on their mass-to-charge (M/Z) ratio and measures their relative abundance, producing a characteristic mass spectrum. Peaks representing the relative abundance of the compounds are identified as molecules based on their relative retention times, matches to a library of mass spectra with known compound identities, and comparison to standards.
=== SIRVD model === The susceptible-infected-recovered-vaccinated-deceased (SIRVD) epidemic compartment model extends the SIR model to include the effects of vaccination campaigns and time-dependent fatality rates on epidemic outbreaks. It encompasses the SIR, SIRV, SIRD, and SI models as special cases, with individual time-dependent rates governing transitions between different fractions. This model uses the following system of differential equations for the population fractions
=== Food products === Lactiplantibacillus plantarum is commonly found in milk products, meat and a lot of vegetable fermentations including sauerkraut, pickles, brined olives, kimchi, Ogi, sourdough, tempoyak, and other fermented plant material, and also some cheeses, fermented sausages, and stockfish. The high levels of this organism in food also makes it an ideal candidate for the development of probiotics. In a 2008 study by Juana Frias et al., L. plantarum was applied to reduce the allergenicity of soy flour. The result showed that, compared to other microbes, L. plantarum-fermented soy flour showed the highest reduction in IgE immunoreactivity (96–99%), depending upon the sensitivity of the plasma used. L. plantarum is also found in dadiah, a traditional fermented buffalo milk of the Minangkabau people, native to Sumatra. Lactobacillus plantarum strain K21 is a gram-positive bacteria isolated from fermented vegetables. It has the ability to hydrolyze bile salt when it is provided as a supplement. In fat mice, K21 also reduces the levels of cholesterol and triglyceride, and inhibits the accumulation of lipid in 3T3-L1 preadipocytes. Furthermore, it reduces the level of plasma leptin, mitigates liver damage and alleviates glucose intolerance. Finally K21 inhibits body weight gain and fat mass accumulation.
where the nuclear binding energy is proportional to the nuclear volume, while nucleons near the surface interact with fewer nucleons, reducing the effect of the volume term. According to Lilley, "For all naturally occurring nuclei, the surface-energy term dominates and the nucleus exists in a state of equilibrium." The negative contribution of Coulomb energy arises from the repulsive electric force of the protons. The symmetry term arises from the fact that effective forces in the nucleus are stronger for unlike neutron-proton pairs, rather than like neutron–neutron or proton–proton pairs. The pairing term arises from the fact that like nucleons form spin-zero pairs in the same spatial state. The pairing is positive if N and Z are both even, adding to the binding energy. In fission there is a preference for fission fragments with even Z, which is called the odd–even effect on the fragments' charge distribution. This can be seen in the empirical fragment yield data for each fission product, as products with even Z have higher yield values. However, no odd–even effect is observed on fragment distribution based on their A. This result is attributed to nucleon pair breaking. In nuclear fission events the nuclei may break into any combination of lighter nuclei, but the most common event is not fission to equal mass nuclei of about mass 120; the most common event (depending on isotope and process) is a slightly unequal fission in which one daughter nucleus has a mass of about 90 to 100 daltons and the other the remaining 130 to 140 daltons.
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.
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.