reference standard 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 2026-07-25. Numbers and descriptions here follow the published literature rather than marketing material.
SR9009 stability depends on temperature, moisture, light, and solvent. Solid material is generally kept cool and dry, while solutions may require protection from repeated warming and cooling. Degradation can appear as color changes, precipitate, or new chromatographic peaks. Researchers should follow supplier instructions and their own stability data. Long-term storage conditions for human use have not been established because the compound lacks approved clinical formulation.
SR9009 is supplied as a solid research chemical, often in milligram quantities. Laboratories typically weigh it in a controlled environment because fine powders can disperse. Stock solutions are commonly prepared in dimethyl sulfoxide and stored in small aliquots to reduce freeze-thaw cycles. Personal protective equipment and chemical fume hoods are standard when handling unknown or potent compounds. These practices address laboratory safety rather than human use.
Identity and purity of SR9009 samples are usually checked with chromatographic and spectrometric methods. High-performance liquid chromatography can separate the compound from related impurities, while mass spectrometry provides molecular mass confirmation. Nuclear magnetic resonance spectroscopy may be used for structural verification in research settings. No single method proves biological activity, and certificates of analysis should be reviewed alongside raw data. Independent testing is often needed because online products vary widely.
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.
In laboratory settings, SR9009 is typically characterized by liquid chromatography–mass spectrometry (LC-MS) or high-performance liquid chromatography with ultraviolet detection (HPLC-UV). These methods can confirm identity and estimate purity, but they require reference standards for accurate quantification. Because SR9009 is not a licensed pharmaceutical, no harmonized pharmacopeial monograph exists. Laboratories often validate in-house methods for matrices such as plasma, urine, or cell culture media. Sample preparation may involve protein precipitation or liquid-liquid extraction before analysis.
| Property | Value | Notes |
|---|---|---|
| Synonyms | SR9009; Stenabolic | Stenabolic is an informal name |
| Common form | Crystalline powder | Supplied in milligram to gram quantities |
| Long-term storage | -20 °C, desiccated, protected from light | Reduces degradation |
| Detection technique | LC-MS/MS | Common in anti-doping and research analysis |
| Regulatory status | Prohibited in sport by WADA | Not approved for human therapeutic use |
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.
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.
SR9009 is a synthetic small molecule developed as a REV-ERB agonist. It binds to REV-ERBα and REV-ERBβ, nuclear receptors that help regulate circadian rhythms and metabolic gene expression. In cell and animal studies, the compound alters lipid and glucose handling and influences skeletal muscle oxidative capacity. Its exact effects in humans remain largely uncharacterized because controlled clinical trials have not been reported. The molecule is frequently described in preclinical literature as a metabolic modulator.
Research interest in SR9009 grew from studies showing improved running endurance in mice after short treatment periods. Those experiments linked the compound to increased mitochondrial content and fatty acid oxidation in muscle, but the findings come from animal models and specific dosing schedules. Independent replication has been limited, and the pathways connecting REV-ERB activation to exercise performance are still being mapped. Whether similar responses occur in humans is an open question.
Low-level waste (LLW) is generated from hospitals and industry, as well as the nuclear fuel cycle. Low-level wastes include paper, rags, tools, clothing, filters, and other materials which contain small amounts of mostly short-lived radioactivity. Materials that originate from any region of an active area are commonly designated as LLW as a precautionary measure even if there is only a remote possibility of being contaminated with radioactive materials. Such LLW typically exhibits no higher radioactivity than one would expect from the same material disposed of in a non-active area, such as a normal office block. Example LLW includes wiping rags, mops, medical tubes, laboratory animal carcasses, and more. LLW makes up 94% of all radioactive waste volume in the UK. Most of it is disposed of in Cumbria, first in landfill style trenches, and now using grouted metal containers that are stacked in concrete vaults. A new site in the north of Scotland is the Dounreay site which is prepared to withstand a 4m tsunami.[1] Some high-activity LLW requires shielding during handling and transport but most LLW is suitable for shallow land burial. To reduce its volume, it is often compacted or incinerated before disposal. Low-level waste is divided into four classes: class A, class B, class C, and Greater Than Class C (GTCC).
== History == In 2012, the Committee for Medicinal Products for Human Use (CHMP) of the EMA issued a positive opinion on the drug. Dapagliflozin was found effective in several studies in participants with type 2 diabetes. The main measure of effectiveness was the level of glycated haemoglobin (HbA1c), which indicates how well blood glucose is controlled. In two studies involving 840 participants with type 2 diabetes, dapagliflozin when used alone decreased HbA1c levels by 0.66% more than placebo (a dummy treatment) after 24 weeks. In four other studies involving 2,370 participants, adding dapagliflozin to other diabetes medicines decreased HbA1c levels by 0.54–0.68% more than adding placebo after 24 weeks. In a study involving 814 participants with type 2 diabetes, dapagliflozin used in combination with metformin was at least as effective as a sulphonylurea (another type of diabetes medicine) used with metformin. Both combinations reduced HbA1c levels by 0.52% after 52 weeks. A long-term study, involving over 17,000 participants with type 2 diabetes, looked at the effects of dapagliflozin on cardiovascular (heart and circulation) disease. The study indicated that dapagliflozin's effects were in line with those of other diabetes medicines that also work by blocking SGLT2. In two studies involving 1,648 participants with type 1 diabetes whose blood sugar was not controlled well enough on insulin alone, adding dapagliflozin 5 mg decreased HbA1c levels after 24 hours by 0.37% and by 0.42% more than adding placebo.
Proteins gain entry into the nucleus through the nuclear envelope. The nuclear envelope consists of concentric membranes, the outer and the inner membrane. The inner and outer membranes connect at multiple sites, forming channels between the cytoplasm and the nucleoplasm. These channels are occupied by nuclear pore complexes (NPCs), complex multiprotein structures that mediate the transport across the nuclear membrane. A protein translated with an NLS will bind strongly to importin (aka karyopherin), and, together, the complex will move through the nuclear pore. At this point, Ran-GTP will bind to the importin-protein complex, and its binding will cause the importin to lose affinity for the protein. The protein is released, and now the Ran-GTP/importin complex will move back out of the nucleus through the nuclear pore. A GTPase-activating protein (GAP) in the cytoplasm hydrolyzes the Ran-GTP to GDP, and this causes a conformational change in Ran, ultimately reducing its affinity for importin. Importin is released and Ran-GDP is recycled back to the nucleus where a Guanine nucleotide exchange factor (GEF) exchanges its GDP back for GTP.
== Toponym == The name of the town was attested in 1489, even before it was founded by François I in the form le Hable de Grace then Ville de Grace in 1516, two years before its official founding. The learned and transient name of Franciscopolis in tribute to the same king, is encountered in some documents then that of Havre Marat, referring to Jean-Paul Marat during the French Revolution but was not imposed. However it explains why the complementary determinant -de-Grace was not restored. This qualifier undoubtedly referred to the Chapel of Notre Dame located at the site of the cathedral of the same name. The chapel faced the Chapel Notre Dame de Grace of Honfleur across the estuary. The common noun havre meaning 'port' was out of use at the end of the 18th or beginning of the 19th centuries but is still preserved in the phrase havre de paix meaning 'safe haven'. It is generally considered a loan from Middle Dutch from the 12th century. A Germanic origin can explain the "aspiration" of the initial h. Havre de Grace, Maryland, in the United States retains the de Grace from colonial times. New research however focuses on the fact that the term was attested very early (12th century) and in Norman texts in the forms Hable, hafne, havene, havne, and haule makes a Dutch origin unlikely.
Remediation for Legionella outbreaks in commercial buildings vary, but often include hot water flushes (160 °F (71 °C)), sterilisation of standing water in evaporative cooling basins, replacement of shower heads, and, in some cases, flushes of heavy metal salts. Preventive measures include adjusting normal hot water levels to allow for 120 °F (49 °C) at the tap, evaluating facility design layout, removing faucet aerators, and periodic testing in suspect areas.
Sources: en.wikipedia.org
==== Cover-up allegations ==== Fonterra notified the New Zealand government on 5 September and three days later, Prime Minister Helen Clark had Beijing officials alerted directly. News reports began circulating in China on 9 September, and the news was broken internationally by Reuters the following day. The state-controlled media report did not initially identify the company involved. Posts on Chinese social portal Tianya named Sanlu as the culprit, which Sanlu denied. According to a State Council investigation, Sanlu had known about infants made sick by its products as early as December 2007, but no testing was performed until June 2008. It said leading government officials in Shijiazhuang city had failed to report the contamination to provincial and state authorities (until 9 September) in violation of rules on reporting major incidents involving food safety. According to the People's Daily, on 2 August, Sanlu asked the Shijiazhuang city government to assist them in controlling the media's reporting of the recall. According to accounts confirmed by media reports and health officials, the company tried to buy off critics and cover up the contamination. In a memo dated 11 August, Beijing-based public relations agency Teller International advised Sanlu to seek cooperation with major search engines to censor negative information. The agency reportedly had repeatedly contacted key account staff at Baidu and proposed a ¥3 million (US$440,000) budget to screen all negative news.
Clinically, envenomation from coastal taipan bites commonly leads to neurotoxic effects, characterised by descending flaccid paralysis, ptosis, diplopia, ophthalmoplegia, bulbar weakness, intercostal weakness, and limb weakness. Severe cases require intubation. Venom-induced consumption coagulopathy is also common, characterised by clotting abnormalities and haemorrhage. Less-common effects are muscle damage (myotoxicity), characterised by elevated creatine kinase and myalgia (muscle pain), acute kidney injury (which can require dialysis in severe cases), and general systemic symptoms such as nausea and vomiting, diaphoresis (sweating), and abdominal pain. White cell count is commonly elevated and platelet count is often low. There is generally little local reaction at the site of the bite. The average venom yield from one milking is 120 mg, with a maximum recorded of 400 mg. The subcutaneous LD50 value of this species is 0.106 mg/kg, according to the Australian Venom and Toxin database, or 0.12 mg/kg, according to Engelmann and Obst (1981). The estimated lethal dose for humans is 3 mg. Its venom contains primarily taicatoxin, a highly potent neurotoxin, along with taipoxin, which has an LD50 of 2 μg/kg. 124 μg of the latter can kill a healthy 62 kg adult.
Scholae: the personal guard of the Emperor, created by Constantine I to replace the Praetorian Guard; Palatinae: "palace troops" were the highest ranked units, created by Constantine I after he disbanded the Praetorian Guard, it was comprised originally of former guardsmen; Comitatenses: regular field units, some were newly-formed, others were descended from Early-Empire legions; Pseudocomitatenses: these were limitanei units diverted into the field army and often kept there; some Early Empire legions became pseudocomitatenses units. These units usually numbered between 300 and 2,000 soldiers and some of them kept their original numbering schemes. The primary source for the legions of this era is the Notitia Dignitatum, a late 4th-century document containing all the civil and military offices of both halves of the Roman Empire (revised in c. 420 for the Western Empire).
=== Vision and eye health === Vitamin A status involves eye health via two separate functions. Retinal is an essential factor in rod cells and cone cells in the retina responding to light exposure by sending nerve signals to the brain. An early sign of vitamin A deficiency is night blindness. Vitamin A in the form of retinoic acid is essential to normal epithelial cell functions. Severe vitamin A deficiency, common in infants and young children in southeast Asia causes xerophthalmia characterized by dryness of the conjunctival epithelium and cornea. Untreated, xerophthalmia progresses to corneal ulceration and blindness.
Sources: en.wikipedia.org
Laboratories commonly use liquid chromatography coupled with mass spectrometry to detect SR9009. The method can identify the compound and estimate concentration in a sample. Detection limits depend on the matrix and instrument.
Research-grade purity indicates a supplier's measured percentage of the intended compound. It does not guarantee safety, sterility, or suitability for human consumption. Buyers should request a certificate of analysis with chromatograms and test methods.
Sports regulators prohibit SR9009 because it is a non-approved substance with potential performance-altering effects. Its presence can be detected in anti-doping testing. Athletes are responsible for substances found in their samples.
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.