This is a working overview of DMSO stock, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-10-03. Anything still debated is marked as such rather than presented as settled.
SR9009 is generally described as poorly soluble in water and more soluble in organic solvents such as dimethyl sulfoxide and ethanol. Stock solutions are commonly prepared in an organic solvent before dilution into an aqueous buffer or vehicle. Precipitation can occur if the organic fraction is reduced too quickly or if the final concentration exceeds the compound's solubility limit. Sonication or gentle warming may aid dissolution in some protocols, but excessive heat can promote degradation. Container material and pH can also influence observed solubility.
For long-term storage, SR9009 is typically kept as a solid at low temperature, protected from moisture and light. Desiccated conditions limit hydrolysis, while opaque containers reduce photochemical breakdown. Solutions are less stable than solids and are often stored frozen in aliquots to avoid repeated freeze-thaw cycles. Stability data are not standardized across all suppliers, so users should rely on certificate-of-analysis information when available. Degradation may appear as color change, precipitate, or decreased chromatographic purity.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. It is not a steroid, peptide, or natural hormone. In scientific literature, it appears under the code SR9009 and in non-scientific contexts as Stenabolic. The compound was identified through chemical screening efforts aimed at targeting circadian clock components. Its status remains investigational, and no regulatory agency has approved it as a human medicine.
REV-ERB proteins help regulate daily cycles in gene expression, including genes tied to lipid and glucose metabolism. SR9009 binds these receptors and alters their activity in cell and animal experiments. Consequences observed in rodents include changes in skeletal muscle oxidative capacity, blood lipid levels, and exercise performance. The precise chain from receptor occupancy to whole-body effects is still an active area of study. Human responses cannot be assumed from rodent data.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Visual inspection is not sufficient for identity. |
| Solubility | Soluble in DMSO and ethanol | Low solubility in water; stock solutions use organic solvent. |
| Storage | -20°C, desiccated, protected from light | Limits hydrolysis and photodegradation. |
| Analytical method | HPLC-UV/MS | Used for identity and purity assessment. |
| Synonyms | SR9009, Stenabolic | Naming varies by supplier. |
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.
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.
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.
Preclinical reports describe effects on exercise endurance, mitochondrial content, and lipid profiles in rodents, but these findings come from specific experimental conditions. Many studies use high doses or delivery methods that may not translate directly to human use. SR9009 has been reported to have low oral bioavailability and a short half-life, which complicates interpretation of oral dosing studies. It is not established as safe or effective for any indication. Literature discussions often separate its pharmacological mechanism from unverified claims made in fitness and supplement markets.
Storage recommendations for SR9009 reference material typically specify a freezer at -20 °C or lower, with protection from moisture and light. Repeated freeze-thaw cycles can degrade small molecules and introduce variability. Stock solutions in dimethyl sulfoxide are often aliquoted to avoid repeated handling. Stability studies may examine degradation under heat, humidity, and light exposure. The compound's thiophene and nitro groups can participate in reactions that alter analytical signals over time, so such changes affect quantitative results.
Quality control for research materials includes identity confirmation by nuclear magnetic resonance and purity assessment by high-performance liquid chromatography. Mass spectrometry provides molecular weight confirmation and can detect related impurities. Purchasers should request a certificate of analysis that lists lot-specific data. Online products advertised for human use often lack such documentation. Distinguishing legitimate research material from mislabeled or contaminated samples is a recurring challenge in independent testing, and independent laboratories may use orthogonal methods to verify identity.
Detection of SR9009 in biological samples usually relies on liquid chromatography coupled to tandem mass spectrometry. This approach separates the compound from matrix components and identifies it by mass transitions. Because SR9009 can undergo metabolism, laboratories often look for both parent drug and specific metabolites. Sample preparation may involve protein precipitation or solid-phase extraction. Method validation examines sensitivity, carryover, and interference from related substances, and reference standards are required for accurate calibration.
Cyproheptadine is a potent antihistamine or inverse agonist of the histamine H1 receptor. It also has anticholinergic, antiserotonergic, antidopaminergic, and local anesthetic activities. In one study, cyproheptadine had about the same affinity for the serotonin 5-HT2A and 5-HT2B receptors as for the histamine H1 receptor, about 8-fold selectivity for the histamine H1 receptor over the serotonin 5-HT2C receptor, about 2- to 8-fold selectivity for the H1 receptor over the muscarinic acetylcholine receptors, and about 4- to 52-fold selectivity for the histamine H1 receptor over the dopamine receptors. The drug shows lower affinity for α-adrenergic receptors and little to no affinity for the monoamine transporters. Of the serotonin receptors, it is an especially potent antagonist of the 5-HT2 receptors. This is thought to underlie its effectiveness in the treatment of serotonin syndrome. However, it is possible that blockade of 5-HT1 receptors may also contribute to its effectiveness in serotonin syndrome. Cyproheptadine has been reported to block 85% of 5-HT2 receptors in the human brain at a dose of 4 mg three times per day (12 mg/day total) and to block 95% of 5-HT2 receptors in the human brain at a dose of 6 mg three times per day (18 mg/day total) as measured with positron emission tomography (PET). The most widely used dose of cyproheptadine for serotonin syndrome has been said to be 4 mg, though doses of up to 16 mg have been used.
Throughout most of the war, the National Revolutionary Army issued rations consisting solely of rice to its soldiers, supplying an average of 2.5 cups of rice per day. Soldiers were expected to forage for additional foods such as wild onions, garlic, mushrooms, and leeks to eat with their rice and to purchase extra food in local markets with their military pay. Their ability to purchase food varied with price fluctuations. Rationing proved a point of contention between Chinese commanders and their American advisors, who insisted that Chinese soldiers were underfed and in particular required more meat. In February 1945 a new ration was officially adopted in a Sino-American conference which incorporated rice, vegetables, beans, peanuts, salt, and meat, with alternatives such as eggs and fish for when meat was unavailable, but implementation proved difficult in practice. The German Wehrmacht received basic rations of hard bread and canned meat (usually pork, roast beef, turkey, or chicken, though cans labeled Fleischkonserve—literally translated as "can of meat"—went unidentified), with each soldier typically carrying a daily supply consisting of a 11-ounce (300 g) tin of meat and a 4.4-to-5.3-ounce (125 to 150 g) piece of hard bread. Soldiers were also issued canned tomato soup, condensed milk, and Erbswurst (a compact peasemeal sausage that can be dissolved to make pea soup). Elite units received more unique high-energy food.
== Further reading == Brunner, Gerd (2010). "Applications of Supercritical Fluids". Annual Review of Chemical and Biomolecular Engineering. 1 (1): 321–342. doi:10.1146/annurev-chembioeng-073009-101311. ISSN 1947-5438. PMID 22432584.
Sources: en.wikipedia.org
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== Research == In one clinical study, pentazocine was found to rapidly and substantially reduce symptoms of mania in individuals with bipolar disorder that were in the manic phase of the condition. It was postulated that the efficacy observed was due to κ-opioid receptor activation-mediated amelioration of hyperdopaminergia in the reward pathways. Minimal sedation and no side effects including psychotomimetic effects or worsening of psychosis were observed at the dose administered.
This tunability, along with its biocompatibility, makes it an extremely useful material for scaffold creation. Scaffolds may also be constructed from natural materials: different derivatives of the extracellular matrix have been studied to evaluate their ability to support cell growth. Protein based materials – such as collagen, or fibrin, and polysaccharidic materials- like chitosan or glycosaminoglycans (GAGs), have all proved suitable in terms of cell compatibility. Among GAGs, hyaluronic acid, possibly in combination with cross linking agents (e.g. glutaraldehyde, water-soluble carbodiimide, etc.), is one of the possible choices as scaffold material. Due to the covalent attachment of thiol groups to these polymers, they can crosslink via disulfide bond formation. The use of thiolated polymers (thiomers) as scaffold material for tissue engineering was initially introduced at the 4th Central European Symposium on Pharmaceutical Technology in Vienna 2001. As thiomers are biocompatible, exhibit cellular mimicking properties and efficiently support proliferation and differentiation of various cell types, they are extensively used as scaffolds for tissue engineering. Furthermore, thiomers such as thiolated hyaluronic acid and thiolated chitosan were shown to exhibit wound healing properties and are subject of numerous clinical trials. Additionally, a fragment of an extracellular matrix protein, such as the RGD peptide, can be coupled to a non-bioactive material to promote cell attachment. Another form of scaffold is decellularized tissue.
=== Symbols === The Culture has no flag, symbol or logo. According to Consider Phlebas, people can recognise items made by the Culture implicitly, by the way they are simple, efficient and aesthetic. The main outright symbol of the Culture is its language, Marain, which is used far beyond the Culture itself. It is often employed in the galaxy as a de facto lingua franca among people who don't share a language. Marain has a similar purpose to other constructed languages encountered in utopian and dystopian fiction including Pravic in The Dispossessed and Newspeak in Nineteen Eighty-Four.
Sources: en.wikipedia.org
Liquid chromatography with mass spectrometry is a common approach. Ultraviolet detection and nuclear magnetic resonance can support identification when suitable standards are available.
The solid is generally kept cold, dry, and protected from light. Solutions are often frozen in single-use aliquots to reduce repeated freeze-thaw cycles.
It indicates a material sold for laboratory study, not for human use. The label does not guarantee pharmaceutical purity, sterility, or regulatory approval.
It is a synthetic compound studied as an agonist of REV-ERB nuclear receptors. It is not an approved medicine and has mainly been examined in laboratory and animal research.