If you have been reading about reference standard 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.
Updated 2026-04-29. Numbers and descriptions here follow the published literature rather than marketing material.
Physicochemical behavior influences handling. SR9009 is described as a solid with limited aqueous solubility, so organic solvents such as dimethyl sulfoxide or ethanol are common in research stock solutions. Aqueous dilution can produce precipitates if the organic content is too low. Light, heat, and repeated freeze-thaw cycles may affect stability. Storage recommendations usually specify a desiccated freezer environment protected from light, but exact stability data depend on the formulation and matrix.
Detection in biological samples can be complicated by rapid metabolism and low circulating concentrations. Some studies report phase I and phase II metabolites, and analytical methods may need to target those species in addition to the parent compound. Immunoassays are not broadly available, so mass spectrometry remains the main confirmatory approach. For anti-doping testing, laboratories look for SR9009 and its metabolites using validated LC-MS methods. Open questions include how long metabolites remain detectable and how different routes of administration alter detection windows.
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.
At the molecular level, SR9009 binds the ligand-binding domain of REV-ERB and strengthens recruitment of corepressor proteins such as NCoR and HDAC3. This increases repression of target genes, including Bmal1 and other clock-controlled and metabolic genes. In rodent studies, such changes have been linked to altered lipid handling, glucose metabolism, and energy expenditure. The precise chain of events between receptor binding and whole-body effects remains an active area of research. Findings in animals do not automatically translate to humans.
| Property | Value | Notes |
|---|---|---|
| Appearance | Off-white to pale yellow solid | Visual description varies with purity and source |
| Solubility | Soluble in DMSO and ethanol; poorly soluble in water | Organic stock solutions are common in research |
| Typical storage | -20 °C, desiccated, protected from light | Avoid repeated freeze-thaw cycles |
| Typical analytical method | LC-MS or HPLC-UV | Reference standards are needed for quantification |
| Molar mass | Approximately 437.9 g/mol | Calculated from the reported free-base formula |
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.
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.
Pharmacokinetic data for SR9009 are limited in published literature. Some reports indicate low oral bioavailability and rapid clearance in animals, which complicates interpretation of exposure and effect. Researchers often use injected routes in preclinical work to achieve measurable systemic levels. Analytical studies rely on mass spectrometry to detect the parent compound and its metabolites. Questions about tissue distribution, active metabolites, and long-term consequences remain open. Species differences in metabolism can affect observed half-life and target engagement.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. These receptors help regulate circadian rhythms and metabolic gene expression. In laboratory experiments, SR9009 binds these receptors and alters transcription of genes involved in lipid handling, glucose metabolism, and mitochondrial function. It is not a naturally occurring compound and has no approved therapeutic use. Research interest stems from its ability to modify energy metabolism in cells and animal models.
Bitcoin wallets were the first cryptocurrency wallets, enabling users to store the information necessary to transact bitcoins. The first wallet program, simply named Bitcoin, and sometimes referred to as the Satoshi client, was released in 2009 by Nakamoto as open-source software. Bitcoin Core is among the best known clients. Forks of Bitcoin Core exist such as Bitcoin Unlimited. Wallets can be full clients, with a full copy of the blockchain to check the validity of mined blocks, or lightweight clients, just to send and receive transactions without a local copy of the entire blockchain. Third-party internet services, called online wallets or hot wallets, store users' credentials on their servers, making them susceptible of hacks. Cold storage protects bitcoins from such hacks by keeping private keys offline, either through specialized hardware wallets or paper printouts.
==== Knight Grand Cross of the Order of St Michael and St George (GCMG) ==== Diplomatic Service and Overseas List Sir (Arthur) John Coles, , Permanent Under-Secretary of State, Foreign and Commonwealth Office.
=== History of claimed benefits === In 1888, an article appeared in Scientific American discussing potential germicidal activity of tobacco smoke providing immunity against yellow fever epidemic of Florida inspiring research in the lab of Vincenzo Tassinari at the Hygienic Institute of the University of Pisa, who explored the antimicrobial activity against pathogens including Bacillus anthracis, Mycobacterium tuberculosis, Bacillus prodigiosus, Staphylococcus aureus, and others. Carbon monoxide is a bioactive component of tobacco smoke that has been explored for its antimicrobial properties against many of these pathogens. On epidemiological grounds, unexpected correlations between smoking and favorable outcomes initially emerged in the context of cardiovascular disease, where they were described as a smoker's paradox (or smoking paradox). The term smoker's paradox was coined in 1995 in relation to reports that smokers appeared to have unexpectedly good short-term outcomes following acute coronary syndrome or stroke. One of the first reports of an apparent smoker's paradox was published in 1968 based on an observation of relatively decreased mortality in smokers one month after experiencing acute myocardial infarction. In the same year, a case–control study first suggested a possible protective role in Parkinson's disease. Historical claims of possible benefits in schizophrenia, whereby smoking was thought to ameliorate cognitive symptoms, are not supported by current evidence.
=== 18 April === A German government website announced that the country had delivered a Patriot missile system to Ukraine. The United States is yet to confirm if the Patriot system it promised to Ukraine has been delivered. The Ukrainian Interior Ministry announced that it had created an online database of Russian and pro-Russian-separatist soldiers killed in Ukraine. Currently, it identified by name 56,827 "Russian representatives" killed in Ukraine, as well as their place and date of death.
== Etymology == Pilonidal means 'nest of hair' and is derived from the Latin words for 'hair' (pilus) and 'nest' (nidus). The condition was first described by Herbert Mayo in 1833. R. M. Hodges was the first to use the phrase pilonidal cyst to describe the condition in 1880. The condition was widespread in the United States Army during World War II. The condition was termed "Jeep seat" or "Jeep riders' disease", because a large portion of people who were being hospitalized for it rode in Jeeps, and prolonged bumpy rides in the vehicles were believed to have caused the condition due to irritation and pressure on the coccyx.
Sources: en.wikipedia.org
=== Reported end of outbreak: August–September 2022 === On 5 August 2022, the country reported that it had not seen a fever case for seven consecutive days, and that every fever case had recovered. On 8 August, plans were announced to convene the Supreme People's Assembly in September, moving its members out of isolation. A separate review meeting to discuss a "change in direction" in pandemic response was also announced. On 11 August, Kim Jong Un's sister, Kim Yo Jong, stated that her brother had had a fever, implying that he had COVID-19 at one point. She also blamed South Korea for the COVID-19 outbreak in the country, claiming that it sent contaminated anti-Pyongyang leaflets to spread the disease. North Korean media reports indicate that the population have resumed regular activity. On August 25, several sources told NK News that North Korea could possibly allow foreigners into North Korea for the first time since 2020, likely after the 20th National Congress of the Chinese Communist Party later in 2022. In September, however, Kim Jong Un flagged the first rollout of vaccines in November and warned that COVID-19 could reappear in the winter months. The mass vaccination program started in the border areas in late September, making North Korea the last country in the world other than Eritrea to have a mass vaccination program against COVID-19.
=== Juice content === The juice content of the plant varies depending on the age of the plant, since younger plants contain more juice than older ones. The plant provides the least juice after seed maturation because the leaves have already begun decay at that point. Depending on the kind of press used, the amount of resulting juice varies significantly. On average, 50% of the weight of the plant is obtained as juice. The water to dry matter ratio of the juice shows high dry matter content in the upper part of the plant, and is lowest in the leaves when the seeds are ripe. The dry matter content is medium in the fibers and lowest in the shives. The relatively high content of dry matter implies a high percentage of substance components such as carbohydrates, amino acids, protein, fat, cannabinoids, polyphenols, as well as other substrates.
===== MeSH D08.811.913.817 – sulfur group transferases (EC 2.8) ===== MeSH D08.811.913.817.200 – coenzyme a-transferases MeSH D08.811.913.817.400 – sulfotransferases MeSH D08.811.913.817.400.300 – aryl sulfotransferase MeSH D08.811.913.817.500 – sulfurtransferases MeSH D08.811.913.817.500.500 – thiosulfate sulfurtransferase
=== Iraq === In a March 2000 article in The Guardian, Galloway described himself as a supporter of the Iraqi people and the Ba'ath Party, but not Saddam Hussein himself. In a House of Commons debate on 6 March 2002, Foreign Office minister Ben Bradshaw said Galloway was "not just an apologist, but a mouthpiece, for the Iraqi regime over many years." Galloway called the minister a liar and refused to withdraw on the grounds that Bradshaw's claim was "a clear imputation of dishonour", and the sitting was suspended due to the dispute. Bradshaw later withdrew his allegation, and Galloway apologised for using unparliamentary language. Giving evidence in his libel case against The Daily Telegraph in 2004, Galloway testified that he regarded Saddam as a "bestial dictator" and would have welcomed his removal from power, but not by means of a military attack on Iraq. Galloway also pointed out that he was a prominent critic of Saddam Hussein's government in the 1980s, as well as of the role of Margaret Thatcher's government in supporting arms sales to Iraq during the Iran–Iraq War.
Sources: en.wikipedia.org
anticodon A series of three consecutive nucleotides within a transfer RNA which complement the three nucleotides of a codon within an mRNA transcript. During translation, each tRNA recruited to the ribosome contains a single anticodon triplet that pairs with its complementary codon from the mRNA sequence, allowing each codon to specify a particular amino acid to be added to the growing peptide chain. Anticodons containing inosine in the first position are capable of pairing with more than one codon due to a phenomenon known as wobble base pairing.
Structural proteins that bind DNA are well-understood examples of non-specific DNA-protein interactions. Within chromosomes, DNA is held in complexes with structural proteins. These proteins organize the DNA into a compact structure called chromatin. In eukaryotes, this structure involves DNA binding to a complex of small basic proteins called histones, while in prokaryotes multiple types of proteins are involved. The histones form a disk-shaped complex called a nucleosome, which contains two complete turns of double-stranded DNA wrapped around its surface. These non-specific interactions are formed through basic residues in the histones, making ionic bonds to the acidic sugar-phosphate backbone of the DNA, and are thus largely independent of the base sequence. Chemical modifications of these basic amino acid residues include methylation, phosphorylation, and acetylation. These chemical changes alter the strength of the interaction between the DNA and the histones, making the DNA more or less accessible to transcription factors and changing the rate of transcription. Other non-specific DNA-binding proteins in chromatin include the high-mobility group proteins, which bind to bent or distorted DNA. These proteins are important in bending arrays of nucleosomes and arranging them into the larger structures that make up chromosomes. A distinct group of DNA-binding proteins is the DNA-binding proteins that specifically bind single-stranded DNA.
Ancient philosophers as far back as Thales of Miletus c. 550 BCE had inklings of the conservation of some underlying substance of which everything is made. However, there is no particular reason to identify their theories with what we know today as "mass-energy" (for example, Thales thought it was water). Empedocles (490–430 BCE) wrote that in his universal system, composed of four roots (earth, air, water, fire), "nothing comes to be or perishes"; instead, these elements suffer continual rearrangement. Epicurus (c. 350 BCE) on the other hand believed everything in the universe to be composed of indivisible units of matter—the ancient precursor to 'atoms'—and he too had some idea of the necessity of conservation, stating that "the sum total of things was always such as it is now, and such it will ever remain." In 1605, the Flemish scientist Simon Stevin was able to solve a number of problems in statics based on the principle that perpetual motion was impossible. In 1639, Galileo published his analysis of several situations—including the celebrated "interrupted pendulum"—which can be described (in modern language) as conservatively converting potential energy to kinetic energy and back again. Essentially, he pointed out that the height a moving body rises is equal to the height from which it falls, and used this observation to infer the idea of inertia. The remarkable aspect of this observation is that the height to which a moving body ascends on a frictionless surface does not depend on the shape of the surface.
=== Pluvicto and Xofigo for prostate cancer === Pluvicto also uses Lu-177 as the radioisotope (which is a beta emitter that decays to Hf-177) but its ligand is a prostate-specific membrane antigen (PSMA) targeted ligand as this radioligand therapy addresses metastatic prostate cancer. It was FDA approved in 2022. The difference between Lutathera and Pluvicto is shown in the chemical linkages in the images above. The production, transportation, and storage is the same as Lutathera. The therapy is administered intravenously through gravity, syringe, or a Peristaltic Infusion Pump. The major warnings include renal toxicity, infertility in males, and embryo/fetal harm. General side effects of this radioligand therapy include fatigue, nausea, dry mouth, anemia, decreased appetite, and constipation. Regular blood tests and imaging post-therapy are needed to see if the radioligand therapy is working and its side effects.
The insulin concentration in blood increases after meals and gradually returns to basal levels during the next 1–2 hours. However, the basal insulin level is not stable. It oscillates with a regular period of 3-6 min. After a meal the amplitude of these oscillations increases but the periodicity remains constant. The oscillations are believed to be important for insulin sensitivity by preventing downregulation of insulin receptors in target cells. Such downregulation underlies insulin resistance, which is common in type 2 diabetes. It would therefore be advantageous to administer insulin to diabetic patients in a manner mimicking the natural oscillations. The insulin oscillations are generated by pulsatile release of the hormone from the pancreas. Insulin originates from beta cells located in the islets of Langerhans. Since each islet contains up to 2000 beta cells and there are one million islets in the pancreas it is apparent that pulsatile secretion requires sophisticated synchronization both within and among the islets of Langerhans.
Sources: en.wikipedia.org
It is usually detected by LC-MS or HPLC-UV against a reference standard. In biological matrices, metabolite targeting can improve detection. No universal immunoassay is widely available.
The compound is generally handled as light-sensitive and stored cold and dry. Stability in solution depends on solvent, concentration, and storage time. Specific degradation rates are not fully standardized.
Limited water solubility affects formulation for cell and animal studies. Organic co-solvents are often used to dissolve it. Precipitation can confound assay results if not controlled.
SR9009 is a synthetic research compound that activates the REV-ERBα and REV-ERBβ nuclear receptors. It is not an approved drug and has no established human therapeutic use. Most published biological data come from cell and rodent studies.