If you have been reading about circadian rhythm 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.
Last reviewed on 2025-12-24. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic small molecule | Studied as a REV-ERB agonist |
| Molecular formula | C20H24ClN3O4S | Reported for the neutral compound |
| Appearance | Off-white to pale yellow solid | Typical research-grade material |
| Solubility | Sparingly soluble in water | Soluble in solvents such as DMSO |
| Common synonyms | SR9009; Stenabolic | Stenabolic is an informal alias |
Laboratory samples of SR9009 are typically supplied as a white to off-white powder. The compound dissolves readily in organic solvents such as dimethyl sulfoxide and ethanol, while its solubility in water is low. Because of this solubility profile, researchers often prepare concentrated stock solutions in an organic solvent before diluting them into aqueous assay buffers. Light exposure, moisture, and repeated freeze-thaw cycles can degrade many small molecules, so handling procedures usually aim to minimize these factors. Purity is commonly checked before use.
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.
The highest approval rating for the government was in the Northeast (65%), among people with up to a completed elementary education (60%), those earning two minimum wages (59%), and among women (59%). In a survey conducted by PoderData between 24 and 26 September with 2,500 people, a margin of error of 2 percentage points, and a confidence level of 95%, the government obtained 48% approval and 45% disapproval. The regions that most approve of the Lula government are the Southeast and the Northeast, and his government is more approved among younger and older poor and middle-class women. Lula as a person received 36% of mentions as excellent or good, 25% as regular, and 35% as bad or terrible. The survey also asked whether respondents liked Lula's administration more than Bolsonaro's. Forty-eight percent agreed with the statement, 40% disagreed, and 9% said there was no difference. Among evangelicals, government approval fell by two percentage points to 32%, and rejection rose to 64%. Among Catholics, approval fell by 3 percentage points to 57%, and disapproval rose to 36%. In a survey released by Paraná Pesquisas on 13 January 2025, it was revealed that the negative evaluation of President Luiz Inácio Lula da Silva's government exceeded the positive one. According to the survey data, 11.1% of Brazilians considered the government excellent and 22.7% classified it as good, totaling 33.8% positive evaluation. On the other hand, 42.6% of respondents evaluated the government as bad (8.4%) or terrible (34.2%).
== Side effects == DOx drugs like DOM have been associated with certain side effects that have not occurred to the same extent with other psychedelics like LSD. Examples of such side effects include physical symptoms like sweating, tremors, and large increases in heart rate.
Uranium was also used in photographic chemicals (especially uranium nitrate as a toner), in lamp filaments for stage lighting bulbs, to improve the appearance of dentures, and in the leather and wood industries for stains and dyes. Uranium salts are mordants of silk or wool. Uranyl acetate and uranyl formate are used as electron-dense "stains" in transmission electron microscopy, to increase the contrast of biological specimens in ultrathin sections and in negative staining of viruses, isolated cell organelles and macromolecules. The discovery of the radioactivity of uranium ushered in additional scientific and practical uses of the element. The long half-life of uranium-238 (4.47×109 years) makes it well-suited for use in estimating the age of the earliest igneous rocks and for other types of radiometric dating, including uranium–thorium dating, uranium–lead dating and uranium–uranium dating. Uranium metal is used for X-ray targets in the making of high-energy X-rays.
Sources: en.wikipedia.org
== History == Hyaluronic acid was first obtained by Karl Meyer and John Palmer in 1934 from the vitreous body in a cow's eye. The first hyaluronan biomedical product, Healon, was developed in the 1970s and 1980s by Pharmacia, and approved for use in eye surgery (i.e., corneal transplantation, cataract surgery, glaucoma surgery, and surgery to repair retinal detachment). Other biomedical companies also produce brands of hyaluronan for ophthalmic surgery. Native hyaluronic acid has a relatively short half-life (shown in rabbits) so various manufacturing techniques have been deployed to extend the length of the chain and stabilise the molecule for its use in medical applications. The introduction of protein-based cross-links, the introduction of free-radical scavenging molecules such as sorbitol, and minimal stabilisation of the HA chains through chemical agents such as NASHA (non-animal stabilised hyaluronic acid) are all techniques that have been used to preserve its shelf life. In the late 1970s, intraocular lens implantation was often followed by severe corneal edema, due to endothelial cell damage during the surgery. It was evident that a viscous, clear, physiologic lubricant to prevent such scraping of the endothelial cells was needed.
=== Discovery, regulation and marketing === Docetaxel is marketed worldwide under the name Taxotere by Sanofi-Aventis as well as Docefrez by Sun Pharma Global and Zytax by Zydus. Annual sales of Taxotere in 2010 were €2.122 billion (US$3.1 billion). The patent expired in 2010. Docetaxel was developed by Rhône-Poulenc Rorer (now Sanofi-Aventis) following from the discoveries of Pierre Potier at CNRS at Gif-sur-Yvette during his work on improvements to the production of paclitaxel (Taxol) using the local European yew.
Unterberg, Towbin Mehmet Omer Koç (1985), Turkish billionaire and member of the prominent Koç family of Turkey; son of billionaire Rahmi Koç and grandson of Vehbi Koç; chairman of Koç Holding, Turkey's largest conglomerate Nikolas Tsakos (1985), Greek shipping magnate, former chairman of the International Association of Independent Tanker Owners and husband of Greek fashion designer Celia Kritharioti Noam Gottesman (1986), billionaire, hedge fund manager, and co-founder of GLG Partners Daniel Ninivaggi (1986), CEO of Lordstown Motors and chairman of Garrett Motion, former CEO of Federal-Mogul and CEO of Icahn Enterprises Alex Navab (1987), head of the Americas Private Equity Business of Kohlberg Kravis Roberts Ben Horowitz (1988), technology entrepreneur, co-founder of software company Opsware and venture capital firm Andreessen Horowitz, son of conservative writer David Horowitz '59 Dirk Edward Ziff (1988), billionaire businessman, son of publishing magnate William Bernard Ziff Jr.
Sources: en.wikipedia.org
Preservative food additives can be antimicrobial – which inhibit the growth of bacteria or fungi, including mold – or antioxidant, such as oxygen absorbers, which inhibit the oxidation of food constituents. Common antimicrobial preservatives include nisin, sorbates, calcium propionate, sodium nitrate/nitrite, sulfites (sulfur dioxide, sodium bisulfite, potassium hydrogen sulfite, etc.), EDTA, hinokitiol, and ε-polylysine. Antioxidants include tocopherols (Vitamin E), butylated hydroxyanisole (BHA) and butylated hydroxytoluene (BHT). Other preservatives include ethanol. There is also another approach of impregnating packaging materials (plastic films or other) with antioxidants and antimicrobials.
=== Quantification in cow's milk cheese via real-time polymerase chain reaction assay === In 2017, there was a study involving the development of a real-time polymerase chain reaction (qPCR) assay for quantifying Lactobacillus delbrueckii subsp. bulgaricus as well as Streptococcus thermophilus in cow's milk cheese. The goal of this study was to create a way to identify and quantify Lactobacillus delbrueckii subsp. bulgaricus and Streptococcus thermophilus, two lactic acid producing species crucial to the fermentation and ripening of cheese, in a timely manner through the use of qPCR. Two assays using lacZ gene targeting PCR primers resulted from this study and were deemed compatible with the two lactic acid bacteria (LAB) species. This allowed for the direct quantification of Lactobacillus delbrueckii subsp. bulgaricus and Streptococcus thermophilus in cheese produced from unpasteurized cow's milk.
The South African general staff judged correctly that if these narrow entry points were seriously contested they had the potential to bottleneck the FAPLA brigades. They opted to launch a counteroffensive at the Lomba River, which was the last of the three rivers FAPLA had to cross before reaching Mavinga. The success of the South African counteroffensive was ensured by the rapid collapse of FAPLA's 47 Infantry Brigade, which was tasked with establishing a bridgehead on the Lomba's southern bank. In conventional terms, the FAPLA brigades theoretically possessed more than enough strength and firepower to dislodge UNITA and the SADF from the Lomba River. But they were inadequately trained or experienced to counter the South African blocking force, which was composed of units selected for their experience in mobile bush warfare, and were outmanoeuvred in the thick foliage cover. The Lomba's swampy environment also hampered coordinated actions and allowed the SADF to isolate and rout each brigade in piecemeal engagements. Between September and October 1987 FAPLA suffered almost 2,000 casualties during several failed river crossings. With much of its bridging equipment destroyed, FAPLA abandoned the offensive and ordered its remaining brigades back to Cuito Cuanavale. The Soviet military mission had suffered 3 dead and at least 1 seriously wounded. The SADF had suffered 17 dead and 41 wounded, as well as the loss of 5 armoured vehicles.
Sources: en.wikipedia.org
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.
No. SR9009 is frequently mislabeled as a SARM in online discussions, but it does not target androgen receptors. Its known mechanism involves REV-ERB nuclear receptors and circadian-metabolic gene regulation.
Human clinical data are very limited. There is no approved human use, and safety and efficacy in people are not established. Most evidence comes from preclinical models, so effects observed in animals may not apply to humans.
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.