Everything below concerns freeze-thaw. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-03-27. Numbers and descriptions here follow the published literature rather than marketing material.
Laboratory identification of SR9009 typically relies on chromatographic separation coupled to mass spectrometry, often with ultraviolet detection as a secondary check. Nuclear magnetic resonance spectroscopy can confirm molecular structure when a reference standard is available. Because many suppliers sell the compound as a research chemical, independent identity testing is important for experimental reproducibility. A single retention time is not sufficient proof of identity, especially when related compounds may be present. Purity assessments usually report a percentage based on area normalization.
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.
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.
Most published work on SR9009 consists of preclinical studies. It is widely sold as a research chemical, a category that does not imply safety, efficacy, or pharmaceutical-grade quality. Sports anti-doping organizations have listed SR9009 as a prohibited substance, and its presence in an athlete sample can lead to sanctions. Legal status differs by country; in several jurisdictions it is not approved for human consumption and may be treated as an unapproved new drug.
| 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.
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.
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.
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.
Research interest in SR9009 grew from studies of circadian biology and metabolic disease. Preclinical reports describe effects on exercise capacity, muscle metabolism, and blood lipid levels in rodents, but these findings come from controlled laboratory settings. The compound has low oral bioavailability in animals, which limits systemic exposure after swallowing. Investigators often use injected routes in experiments to achieve measurable plasma concentrations. Human clinical data are sparse, no approved therapeutic product exists, and whether animal effects translate to humans remains an open question.
Regulatory and sporting contexts treat SR9009 as a prohibited substance in many elite competitions. Its presence on banned lists reflects concerns about performance enhancement and unknown long-term safety. Analytical chemists have developed methods to detect the parent compound and its metabolites in urine and blood. Literature discussions distinguish between in vitro potency, animal pharmacology, and anecdotal human reports. The latter are difficult to verify because products sold online may lack purity or contain different compounds.
integral polytopic protein Also transmembrane protein. Any of a class of integral membrane proteins which span the entirety of the cell membrane, extending from the interior or cytosolic side of the membrane to the exterior or extracellular side. Transmembrane proteins typically have hydrophilic domains exposed to each side as well as one or more hydrophobic domains crossing the nonpolar space inside the lipid bilayer, by which they are further classified as single-pass or multipass membrane proteins. As such many transmembrane proteins function as gated channels or transporters to permit or prohibit the movement of specific molecules or ions across the membrane, often undergoing conformational changes in the process, or as receptors in cell signaling pathways. Contrast integral monotopic protein.
In an article published in Foreign Affairs in January 1969, Kissinger criticized General William Westmoreland's attrition strategy because the Vietnamese Communists were willing to accept far higher losses on the battlefield than the United States and could therefore "win" as long as they did not "lose" by merely keeping the war going. In the same article, he argued that losses endured by the Vietnamese Communists in the Tet Offensive were meaningless as the Tet Offensive had turned American public opinion against the war, ruling out the possibility of a military solution, and the best that could be done now was to negotiate the most favorable peace settlement at the Paris peace talks. Kissinger, when he came into office in 1969 favored a negotiating strategy under which the United States and North Vietnam would sign an armistice and agreed to pull their troops out of South Vietnam while the South Vietnamese government and the Viet Cong were to agree to a coalition government. Kissinger had doubts about Nixon's theory of "linkage", believing that this would give the Soviet Union leverage over the United States and, unlike Nixon, was less concerned about the ultimate fate of South Vietnam. One of Kissinger's first acts as National Security Advisor in early 1969 was to seek opinions of the Vietnam experts within the CIA, the military and the State Department.
Calvatia gigantea, commonly known in English as the giant puffball, is a puffball mushroom found in meadows, fields, and deciduous forests in late summer and autumn. It is found in temperate areas throughout the world. It is edible when young.
Sources: en.wikipedia.org
=== Cardioprotection against Ischemic injury === JM Downey was the first to introduce the role of PKC in cardioprotection against ischemia-reperfusion injury in 1994,; this seminal idea stimulated a series of studies which examined the different isoforms of PKC. PKCε has been demonstrated to be a central player in preconditioning in multiple independent studies, with its best known actions at cardiac mitochondria. It was first demonstrated by Ping et al. that in five distinct preconditioning regimens in conscious rabbits, the epsilon isoform of PKC specifically translocated from the cytosolic to particulate fraction. This finding was validated by multiple independent studies occurring shortly thereafter, and has since been observed in multiple animal models and human tissue, as well as in studies employing transgenesis and PKCε activators/inhibitors. Mitochondrial targets of PKCε involved in cardioprotection have been actively pursued, since the translocation of PKCε to mitochondria following protective stimuli is one of the most well-accepted cardioprotective paradigms. PKCε has been shown to target and phosphorylate alcohol dehydrogenase 2 (ALDH2) following preconditioning stimuli, which increased the activity of ALDH2 and reduced infarct size. Moreover, PKCε interacts with cytochrome c oxidase subunit IV (COIV), and preconditioning stimuli evoked phosphorylation of COIV and stabilization of COIV protein and activity.
Sitagliptin (Januvia) has a novel structure with β-amino amide derivatives (Figure 7). Since sitagliptin has shown excellent selectivity and in vivo efficacy it urged researchers to inspect the new structure of DPP-4 inhibitors with appended β-amino acid moiety. Further studies are being developed to optimize these compounds for the treatment of diabetes. In October 2006 sitagliptin became the first DPP-4 inhibitor that got FDA approval for the treatment of type 2 diabetes. Crystallographic structure of sitagliptin along with molecular modeling has been used to continue the search for structurally diverse inhibitors. A new potent, selective and orally bioavailable DPP-4 inhibitor was discovered by replacing the central cyclohexylamine in sitagliptin with 3-aminopiperidine. A 2-pyridyl substitution was the initial SAR breakthrough since that group plays a significant role in potency and selectivity for DPP-4. It has been shown with an X-ray crystallography how sitagliptin binds to the DPP-4 complex: 1. The trifluorophenyl group occupies the S1-pocket 2. The trifluoromethyl group interacts with the side chains of residues Arg358 and Ser209. 3. The amino group forms a salt bridge with Tyr662 and the carboxylated groups of the two glutamate residues, Glu205 and Glu206. 4. The triazolopiperazine group collides with the phenyl group of residue Phe357
== Early life and education == Shawn was born in New York City to a Jewish family. His parents were journalist Cecille (née Lyon) and William Shawn, the longtime editor of The New Yorker. He has younger twin siblings: composer Allen Shawn, and Mary, who is autistic and lives in an institution. William was the son of emigrants from Central Europe. Shawn grew up on Manhattan's Upper East Side. He attended The Collegiate School on Manhattan's West Side before transferring to The Putney School, a private liberal arts high school in Putney, Vermont. After high school, he studied history at Harvard University, graduating in 1965 with a Bachelor of Arts. He then studied philosophy, politics and economics, as well as Latin, at Magdalen College, Oxford, originally intending to become a diplomat. He traveled to India as an English teacher on a Fulbright program.
Irregularities were also reported on election day, with the election observation platform Vote62 receiving over 5,000 reports from citizens. In Chonburi Constituency 1, a large crowd gathered on 9 February to demand a recount following allegations of irregularities, including misplaced and improperly sealed ballot boxes, power outages during vote counting, vote total discrepancies, and vote tally sheets being found in a rubbish bin. The crowd remained guarding the ballot boxes overnight awaiting a decision by the Election Commission, which after a meeting asked for two days to gather and consider evidence before determining whether there would be a recount. A similar incident of crowds gathering to ask for a recount and guarding ballot boxes also occurred in Maha Sarakham Constituency 1. Following these and similar allegations, the People's Party formally requested recounts in 18 constituencies. One of its former MPs, Wiroj Lakkhanaadisorn, filed a police report against members of the Election Commission in Chonburi. The Pheu Thai Party also urged the Election Commission to investigate and address the concerns. Korn Chatikavanij, deputy leader of the Democrat Party, criticized the Election Commission, expressing disappointment that citizens were unable to feel trust in the election process. Pirapan Salirathavibhaga, the leader of the United Thai Nation Party, posted on his Facebook account demanding a nationwide recount.
Sources: en.wikipedia.org
. The first isotopes of transplutonium elements, americium-241 and curium-242, were synthesized in 1944 by Glenn T. Seaborg, Ralph A. James and Albert Ghiorso. Curium-242 was obtained by bombarding plutonium-239 with 32-MeV α-particles:
Hypoglycemia (11 - 12%) - while it was shown to have the same efficacy as glimepiride, one of the newer sulfonylureas, the European GUIDE study has shown that it has approximately 50% less hypoglycemic confirmed episodes in comparison with glimepiride. Uncommon adverse effects between 1 - 10%:
James Sherr, head of Russia and Eurasia Programme at Chatham House, wrote in The Telegraph: "The current crisis demonstrates that the Cold War has not been replaced by common values between East and West, but by the revival of hard Realpolitik. [...] Mikhail Saakashvili, Georgia's President, might have been profoundly unwise to employ massive force against the pro-Russian separatists in South Ossetia last Thursday, but his lapses of judgement are not the point. The commanders of Russian forces and their political masters in the Kremlin hoped he would behave exactly as he did. [...] Ukraine has no territorial conflicts, but it has a potential territorial dispute, Crimea." On 10 August 2008, Quentin Peel wrote in the Financial Times, "Saakashvili boosted military spending and refused to rule out the use of force. But he did not intend to use it. By all accounts he was unprepared for the latest confrontation: he was booked to be on a flight to Beijing." On 11 August 2008, The New York Times noted Putin's strong personal enmity towards Georgian president Saakashvili. On 11 August 2008, Robert Kagan wrote that the war was not a result of a "miscalculation" by Georgia, but "revanchist" Russia's attempt to respond to revolutions in Georgia and Ukraine.
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.