NR1D1 comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2026-02-26. Numbers and descriptions here follow the published literature rather than marketing material.
Analytical methods for SR9009 typically rely on liquid chromatography coupled with tandem mass spectrometry. The technique can separate the parent compound from related substances and detect low concentrations in biological matrices. Urine and blood are common samples in anti-doping testing, while in vitro studies may use cell culture media. Rapid metabolism and low expected concentrations make method validation important for reliable identification. Exact metabolite patterns can vary by species and are not fully mapped.
Regulatory treatment of SR9009 reflects its investigational status. The compound has no approved human therapeutic indication, and sports authorities prohibit its use. It appears on anti-doping lists as a non-approved substance or metabolic modulator, depending on the list version. Products sold online as research chemicals are not quality-controlled medicines, so their identity and purity can differ from the label. Such products may also contain unlisted compounds, which complicates both testing and safety assessment.
Laboratory samples of SR9009 are typically handled as research chemicals rather than pharmaceuticals. Suppliers usually state that the material is for research use only and not for human or veterinary administration. Storage recommendations generally call for a freezer at approximately −20 °C, protection from light, and a desiccated environment. The solid is often described as a white to off-white powder. Solubility is commonly reported in organic solvents such as dimethyl sulfoxide and ethanol, with low solubility in water.
Analytical identification and purity assessment often use high-performance liquid chromatography with ultraviolet detection or mass spectrometry. Liquid chromatography–tandem mass spectrometry is used to detect and quantify SR9009 in biological matrices, including urine and blood, for anti-doping or pharmacokinetic studies. Nuclear magnetic resonance spectroscopy can confirm molecular structure. Stability depends on form and storage: the solid is generally more stable than solutions, and repeated freeze–thaw cycles may degrade samples. Purity is typically reported as a percentage from a certificate of analysis.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Not approved for human use | Investigational status in most countries |
| Sports status | Prohibited by WADA | Classified as non-approved or metabolic modulator |
| Common analytical method | LC-MS/MS | Used for trace detection in biological samples |
| Typical test matrices | Urine and blood | Sample choice depends on testing program |
| Human trial data | None published | Effects and safety are not established |
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.
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.
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.
=== Europe === Records of the Dutch East India Company list soy sauce as a commodity in 1737, when seventy-five large barrels were shipped from Dejima, Japan, to Batavia (present-day Jakarta) on the island of Java. Thirty-five barrels from that shipment were then shipped to the Netherlands. In the 18th century, diplomat and scholar Isaac Titsingh published accounts of brewing soy sauce. Although earlier descriptions of soy sauce had been disseminated in the West, his was among the earliest to focus specifically on the brewing of the Japanese version. By the mid-19th century, Japanese soy sauce gradually disappeared from the European market, and the condiment became synonymous with the Chinese product. Europeans were unable to make soy sauce because they did not have access to Aspergillus oryzae, the fungus used in its brewing. Soy sauce made from ingredients such as portobello mushrooms were disseminated in European cookbooks during the late 18th century. A Swedish recipe for "Soija" was published in the 1770 edition of Cajsa Warg's Hjelpreda i Hushållningen för Unga Fruentimber and was flavored with allspice and mace.
Although the war was largely treated with indifference in metropolitan France, "the dirty war" has been featured in various films, books and songs. Since its declassification in the 2000s, television documentaries have been released using new perspectives about the U.S. covert involvement and open critics about the French propaganda used during wartime. The famous Communist propagandist Roman Karmen was in charge of the media exploitation of the battle of Dien Bien Phu. In his documentary, Vietnam (Вьетнам, 1955), he staged the famous scene with the raising of the Việt Minh flag over de Castries' bunker which is similar to the one he staged over the Berlin Reichstag roof during World War II (Берлин, 1945) and the S-shaped POW column marching after the battle, where he used the same optical technique he experimented with before when he staged the German prisoners after the Siege of Leningrad (Ленинград в борьбе, 1942) and the Battle of Moscow (Разгром немецких войск под Москвой, 1942). Hollywood made a film about Dien Bien Phu in 1955, Jump into Hell, directed by David Butler and scripted by Irving Wallace, before his fame as a bestselling novelist. Hollywood also made several films about the war, Robert Florey's Rogues' Regiment (1948). Samuel Fuller's China Gate (1957). and James Clavell's Five Gates to Hell (1959). The first French movie about the war, Shock Patrol (Patrouille de Choc) aka Patrol Without Hope (Patrouille Sans Espoir) by Claude Bernard-Aubert, came out in 1956.
=== pH === The basic driving force for protein crystallization is to optimize the number of bonds one can form with another protein through intermolecular interactions. These interactions depend on electron densities of molecules and the protein side chains that change as a function of pH. The tertiary and quaternary structure of proteins are determined by intermolecular interactions between the amino acids' side groups, in which the hydrophilic groups are usually facing outwards to the solution to form a hydration shell to the solvent (water). As the pH changes, the charge on these polar side group also change with respect to the solution pH and the protein's pKa. Hence, the choice of pH is essential either to promote the formation of crystals where the bonding between molecules to each other is more favorable than with water molecules. pH is one of the most powerful manipulations that one can assign for the optimal crystallization condition.
Sources: en.wikipedia.org
Sampling methods focused on collecting representative samples of the local environment, either from oral swabs or stool. Culturomics (microbiology) is the high-throughput cell culture of bacteria that aims to comprehensively identify strains or species in samples obtained from tissues such as the human gut or from the environment. Microfluidics gut-on-a-chip devices, which simulate the conditions of the gut and allow analysis of changes to the microbiome that can be more accurately monitored than in situ. Mechanical DNA extraction techniques and gene amplification methods, such as PCR, to analyze the genomic profile of the entire microbiome. DNA fingerprinting using microarrays and hybridization techniques allow analysis of shifts in microbiota populations. Multi-omics studies allow for functional analysis of microbiota. Animal models can be used to take more accurate samples of the in situ microbiome. Germ-free animals are used to implant a specific microbiome from another organism to yield a gnotobiotic model. These can be studied to see how it changes under different environmental conditions.
, the disease decays and fades away over time. Using the differential equations of the SIR model and converting them to numerical discrete forms, one can set up the recursive equations and calculate the S, I, and R populations with any given initial conditions but accumulate errors over a long calculation time from the reference point. Sometimes a convergence test is needed to estimate the errors. Given a set of initial conditions and the disease-spreading data, one can also fit the data with the SIR model and pull out the three reproduction numbers when the errors are usually negligible due to the short time step from the reference point. Any point of the time can be used as the initial condition to predict the future after it using this numerical model with assumption of time-evolved parameters such as population,
== Legacy == The Eunuch Culture Museum, located in the Shijingshan district of Beijing, is a museum dedicated to the history of eunuchs in China. It was established on the premises of the tomb of Tian Yi, a famous Ming eunuch who lived from 1534 to 1605. Items now on display mainly consist of articles left behind by Sun; such as his chair, walking stick, and a yellow jacket given to him by Puyi. His biography, The Last Eunuch of China, written by Chinese writer Jia Yinghua, was published in 1998 and translated into English in 2008. Lai Shi, China's Last Eunuch is a 1988 Hong Kong historical drama directed by Jacob Cheung which is loosely based on Sun Yaoting's life, taking inspiration from his biography.
Sources: en.wikipedia.org
4-Aminobenzoic acid (also known as para-aminobenzoic acid or PABA because the two functional groups are attached to the benzene ring across from one another in the para position) is an organic compound with the formula H2NC6H4CO2H. PABA is a white crystalline solid, although commercial samples can appear gray. It is slightly soluble in water. It consists of a benzene ring substituted with amino and carboxyl groups. The compound occurs extensively in the natural world. In industry, PABA is prepared mainly by two routes: Reduction of 4-nitrobenzoic acid Hoffman degradation of the monoamide derived from terephthalic acid. Food sources of PABA include liver, brewer's yeast (and unfiltered beer), kidney, molasses, mushrooms, and whole grains. Other food sources of PABA include spinach and oat seeds.
Cl−indicators can be designed on the basis of endogenously expressed fluorescent proteins such as Yellow fluorescent protein (YFP). An advantage of endogenously expressed probes over dye-based probes is their ability to achieve cell-type-specificity by the choice of Promoter (genetics) promotor. YFP based indicators are mutated forms of Green fluorescent protein (GFP). YFP contains four point mutations and has a red-shifted excitation and emission spectrum compared with GFP. YFP fluorescence is sensitive to various small anions with relative potencies iodine > nitrate > chloride > bromide > formate > acetate. YFP sensitivity to these small anions results from ground-state binding near the chromophore, which apparently alters the chromophore ionization constant and hence the fluorescence emission. The fluorescence of YFP is sensitive to [Cl− ] and pH. The effect is fully reversible. YFP is excited at visible range and is a genetically encoded probe. YFP based Cl− sensors have rather low kinetics of Cl− association / dissociation. The half time association/dissociation constants for YFP mutant range from 50 ms (YFP-H148Q I152L) to 2 sec (YFP-H148Q V163S). If a fluorescent indicators is based on one fluorescent protein only, it doesn't allow for ratiometric measurements. Hence, a rationale for ratiometric fluorescent indicators results.
Professor Reddi discovered that bone induction is a sequential multistep cascade involving chemotaxis, mitosis, and differentiation. Early studies in his laboratory at the University of Chicago and National Institutes of Health unraveled the sequence of events involved in bone matrix-induce bone morphogenesis. Using a battery of in vitro and in vivo bioassays for bone formation, a systematic study was undertaken in his laboratory to isolate and purify putative bone morphogenetic proteins. Reddi and colleagues were the first to identify BMPs as pleiotropic regulators, acting in a concentration dependent manner. They demonstrated first that BMPs bind the extracellular matrix, are present at the apical ectodermal ridge in the developing limb bud, are chemotactic for human monocytes, and have neurotropic potential. His laboratory pioneered the use of BMPs in regenerative orthopedics and dentistry. Professor Reddi's h-index is 109 with over 300 peer-reviewed manuscripts.
Alpha decay energy follows the same trend as for other heavy elements. The lighter astatine isotopes have quite high decay energies, which become lower as more neutrons are added, reaching a minimum at 125 neutrons (astatine-210), even though 126 (astatine-211) is the magic number. The decay energies increase much more steeply, though, on the next two steps, reaching a high at 128 neutrons where the alpha-decay product would have the magic number of 126. Here this is astatine-213, releasing the highest energy and having the shortest life (125 ns) of all the isotopes. The energy then declines again, and alpha lifetimes increase quickly, no long-lived astatine isotope exists; this happens due to the increasing role of beta decay. This decay mode is especially important for astatine: as early as 1950, it was postulated that the element has no beta-stable isotopes (i.e. ones that do not undergo beta decay at all), though nuclear mass measurements reveal that 215At is in fact beta-stable, as it has the lowest mass of all isobars with A = 215. A beta decay mode has been found for all other astatine isotopes except for 212-216At and their isomers. Among other isotopes, if they do not undergo alpha decay: astatine-210 and the lighter isotopes decay by electron capture or positron emission, 211 by electron capture only, and astatine-217 and heavier isotopes undergo β- decay. Astatine-212, 214, and 216 should be able to decay either way.
Sources: en.wikipedia.org
No. It is an investigational compound without approved therapeutic indications. It is sold for research purposes only in many jurisdictions.
Sports authorities prohibit it because it is not approved for human use and has potential performance-enhancing effects. It appears on anti-doping lists under non-approved or metabolic modulator categories.
Detection usually uses liquid chromatography-tandem mass spectrometry. The method targets the parent compound or its metabolites in urine or blood.
Legality depends on the country and the intended use. In many places it is sold as a research chemical, but sports and medicine regulations restrict it.