This is a working overview of reference standard, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-08-01 and is reviewed periodically as new material appears.
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.
Several misconceptions surround SR9009. It is often described as a SARM, a steroid, or an exercise pill, but its known target is the REV-ERB receptor family. Rodent studies have examined exercise capacity and metabolic markers, yet human outcomes remain unproven. Oral bioavailability appears low in animals, and human pharmacokinetics are not well characterized. Online products may contain impurities or different compounds, so identity and purity testing are important for research use.
Analytical chemists detect SR9009 with liquid chromatography-tandem mass spectrometry, commonly abbreviated LC-MS/MS. Sample preparation may involve protein precipitation, liquid-liquid extraction, or solid-phase extraction before analysis. Laboratories can target the parent compound or its metabolites, depending on the matrix and the purpose of testing. Anti-doping methods require sensitive and specific assays because concentrations in biological samples can be low. Reference standards and validated methods are essential for reliable identification and quantification.
| Property | Value | Notes |
|---|---|---|
| Appearance | Off-white to pale yellow solid | Visual description varies with purity and source |
| Solubility | Soluble in DMSO and ethanol; poorly soluble in water | Organic stock solutions are common in research |
| Typical storage | -20 °C, desiccated, protected from light | Avoid repeated freeze-thaw cycles |
| Typical analytical method | LC-MS or HPLC-UV | Reference standards are needed for quantification |
| Molar mass | Approximately 437.9 g/mol | Calculated from the reported free-base formula |
Detection of SR9009 in biological samples usually employs liquid chromatography coupled with tandem mass spectrometry. This method can identify the parent compound and sometimes metabolites in urine or blood. Because exposure can be low and clearance may be rapid, sample timing and limits of detection matter. Laboratories validate assays for sensitivity and specificity. Results are interpreted alongside chain-of-custody and quality-control records. Urine is the common matrix for anti-doping analysis, while blood may be used in research settings.
Handling recommendations for SR9009 in a laboratory setting include storing the solid at low temperature, protected from light and moisture. The compound is often dissolved in dimethyl sulfoxide or ethanol for experiments. Solutions should be prepared with appropriate personal protective equipment and disposed of according to local rules. Stability data for long-term storage are limited, so stock solutions are typically kept cold and used within defined periods. Records of preparation date and concentration support reproducibility.
SR9009 is not approved as a medicine by major regulatory agencies. It is commonly sold as a research chemical, a category that may fall outside customary drug approval and quality rules. In sports, the World Anti-Doping Agency lists SR9009 as a prohibited substance. Athletes who use it can face sanctions if it is detected in a sample. Legal status varies by country, and importation may be restricted. Enforcement practices differ across borders.
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.
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.
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.
The decision to release the declaration was taken by the British War Cabinet on 31 October 1917. This followed discussion at four War Cabinet meetings (including the 31 October meeting) over the space of the previous two months. In order to aid the discussions, the War Cabinet Secretariat, led by Maurice Hankey, the Cabinet Secretary and supported by his Assistant Secretaries – primarily Sykes and his fellow Conservative MP and pro-Zionist Leo Amery – solicited outside perspectives to put before the Cabinet. These included the views of government ministers, war allies – notably from President Woodrow Wilson – and in October, formal submissions from six Zionist leaders and four non-Zionist Jews. British officials asked President Wilson for his consent on the matter on two occasions – first on 3 September, when he replied the time was not ripe, and later on 6 October, when he agreed with the release of the declaration.
== Pathology == While most cells require the action of insulin for glucose to gain entry into the cell, the cells of the retina, kidney, and nervous tissues are insulin-independent, so glucose moves freely across the cell membrane, regardless of the action of insulin. The cells will use glucose for energy as normal, and any glucose not used for energy will enter the polyol pathway. When blood glucose is normal (about 100 mg/dL or 5.5 mmol/L), this interchange causes no problems, as aldose reductase has a low affinity for glucose at normal concentrations. In a hyperglycemic state, the affinity of aldose reductase for glucose rises, causing much sorbitol to accumulate, and using much more NADPH, leaving less NADPH for other processes of cellular metabolism. This change of affinity is what is meant by activation of the pathway. The amount of sorbitol that accumulates, however, may not be sufficient to cause osmotic influx of water. NADPH acts to promote nitric oxide production and glutathione reduction, and its deficiency will cause glutathione deficiency. A glutathione deficiency, congenital or acquired, can lead to hemolysis caused by oxidative stress. Nitric oxide is one of the important vasodilators in blood vessels. Therefore, NADPH prevents reactive oxygen species from accumulating and damaging cells. Excessive activation of the polyol pathway increases intracellular and extracellular sorbitol concentrations, increased concentrations of reactive oxygen species, and decreased concentrations of nitric oxide and glutathione.
=== Viruses === The genomes of some viruses encode one massive polyprotein, which needs a protease to cleave this into functional units (e.g. the hepatitis C virus and the picornaviruses). These proteases (e.g. TEV protease) have high specificity and only cleave a very restricted set of substrate sequences. They are therefore a common target for protease inhibitors.
== Causes == While the mechanism of the disease has yet to be fully elucidated, the leading hypothesis is that AAV (ANCA Associated Vasculitis) develops in patients with a genetic predisposition when an unknown cause triggers the production of p-ANCA. These antibodies will circulate at low levels until an environmental trigger—such as infection, malignancy, or drug therapy, causes the upregulation of neutrophils. The neutrophils bind to p-ANCAs and subsequently release inflammatory cytokines, reactive oxygen species and lytic enzymes that cause endothelial injury resulting to inflammation and necrosis of the small vessels. The damage that is caused in the kidneys is specifically called necrotizing and crescentic glomerulonephritis.
==== Rights restored ==== But on March 7, 2006, the Cherokee Nation Judicial Appeal Tribunal ruled that the Cherokee Freedmen were eligible for Cherokee citizenship. The Cherokee Freedman had historically been recorded as "citizens" of the Cherokee Nation since 1866, and their ancestors were recorded on the Dawes Commission Land Rolls (although generally in the category of Cherokee Freedmen, even if they qualified as "Cherokee by blood", as many did.) The ruling "did not limit membership to people possessing Cherokee blood," as some Freedmen and their descendants had never intermarried with Cherokees. Well-known genealogist, historian, and Freedmen advocate David Cornsilk notes that other historical citizenship bases are still excluded to this day (such as an ancestor tied to an older roll). On May 15, 2007, the Cherokee Nation Tribal Courts reinstated the Cherokee Freedmen as citizens while appeals were pending in the Cherokee Nation Courts and Federal Court. On May 22, 2007, the Cherokee Nation received notice from the United States Bureau of Indian Affairs that the BIA and Federal Government had denied the amendment to the 1975 Cherokee Nation Constitution because it required BIA approval, which had not been obtained. The BIA also noted that the Cherokee Nation had excluded the Cherokee Freedmen from voting on the amendment. On this issue, the Cherokee Nation Supreme Court ruled that the Cherokee Nation could take away the approval authority which it had previously granted the federal government.
Sources: en.wikipedia.org
Solorinic acid is an anthraquinone pigment found in the leafy lichen Solorina crocea. It is responsible for the strong orange colour of the medulla and the underside of the thallus in that species. In its purified crystalline form, it exists as orange-red crystals with a melting point of 201 °C (394 °F). The structure of solorinic acid, 2-n-hexanoyl-1,3,8-trihydroxy-6-methoxy-anthraquinone, was proposed by Koller and Russ in 1937, and verified by chemical synthesis in 1966. Norsolorinic acid, (C20H18O7, 2-hexanoyl-1,3,6,8-tetrahydroxyanthraquinone), is a closely related compound also found in Solorina crocea. Solorinic acid was used as the internal standard in the establishment of a standardized method for the identification of lichen products using high-performance liquid chromatography. This is because it is quite a hydrophobic compound, and consequently will elute more slowly than most lichen products, making possible the identification of lichen extracts containing chlorinated xanthones or long chain depsides. Although usually associated with Solorina crocea, solorinic acid was reported as a lichen product from the crustose, rock-dwelling lichen Placolecis kunmingensis, described as a species new to science in 2019.
In April 2023, Monster Beverage Corporation sued independent videogame developer Glowstick Entertainment for their horror party game Dark Deception: Monsters and Mortals. Apparently to Monster Beverage, the use of "Monster" in the title of the game and their green and black logo make it "very confusing" because of the similarities between the two. Glowstick Entertainment's head creator, Vincent Livings, had decided to fight it in court and has since won the case. Additionally later that month, it was discovered that over 100 trademark complaints had been filed in Japan, including complaints against the Pokémon (1996–), Monster Hunter (2004–), and Monster Musume (2012–) franchises, the first of which predates the Monster Energy brand by over half a decade.
==== Lay Low ==== In January 2015, Doillon started recording and co-producing, alongside Timber Timbre frontman Taylor Kirk, her second album in Canada. She recorded in the Montreal mythical studio Hotel2Tango, over a period of a month, with fellow band members of Timber Timbre. She completed the recording between Studio la Seine in Paris and RAK Studios in London. Lay Low was mixed by Nick Launey and Adam Greenspan in Los Angeles in April. The album came out on 9 October, preceded by the first single "Where to Start", which was featured in Jean-Marc Vallée's' movie Demolition (starring Naomi Watts and Jake Gyllenhaal) soundtrack. Doillon was nominated for best rock album of the year at Les Victoires de la musique. The album received critical acclaim in France, Belgium, England, Canada and the US and was released through Verve in the US and decca in the UK. The front cover for the album is a selfie shot by Doillon in bed, and inner pictures were shot during the recording in Canada by French photographer Zelie Noreda. In 2016, Doillon started a world tour, performing in the US, Canada, Japan, Australia, Korea, Germany, Poland, England and France. She performed on Jools Holland, alongside Iggy Pop and Graham Nash. As a final touch to her world tour, she performed two sold out concerts in La Flèche D'or, named Kitchen Acoustic and Lou Doillon and Friends (performed with fellow musicians Woodkid and Keren Ann).
=== Regeneration === Methionine can be regenerated from homocysteine via (4) methionine synthase in a reaction that requires vitamin B12 as a cofactor. Homocysteine can also be remethylated using glycine betaine (N,N,N-trimethylglycine, TMG) to methionine via the enzyme betaine-homocysteine methyltransferase (E.C.2.1.1.5, BHMT). BHMT makes up to 1.5% of all the soluble protein of the liver, and recent evidence suggests that it may have a greater influence on methionine and homocysteine homeostasis than methionine synthase.
Sources: en.wikipedia.org
== Further reading == Panzer-Heinig, Sabine (2009). Antithrombin (III) - Establishing Pediatric Reference Values, Relevance for DIC 1992 versus 2007 (Thesis). Medizinische Fakultät Charité - Universitätsmedizin Berlin.
=== Critical response === On Rotten Tomatoes, the first season has an approval rating of 89% based on 38 reviews, with an average rating of 7.61/10. The website's critical consensus reads: "A stellar series perfect for anyone looking for a little hope, Stargirl is delightful fun the whole family can enjoy". On Metacritic it has a weighted average score of 68 out of 100 based on 8 reviews, indicating "generally favorable reviews". Brian Lowry of CNN described the series as "hardly seeks to reinvent the wheel, or even expand the mold. Still, its mix of solid characters, clever writing and youthful exuberance casts a brighter light than most". Daniel Fienberg of The Hollywood Reporter gave a review, calling it "derivative, but should fill the superhero-origin-story-shaped hole in your heart" and wrote: "The result is that a show that is frequently derivative to the point of distraction might actually fill a need for viewers able to concentrate on its occasional charms until better superhero shows return". On Rotten Tomatoes, the second season holds an approval rating of 100% based on 5 reviews, with an average rating of 8.2/10.
When it was known as Boston Chicken, restaurants specialized in rotisserie chicken and a variety of side dishes, but in February 1995, the chain expanded its menu to include turkey, meatloaf, and ham and changed the name to Boston Market in the fall of 1995 to reflect this. The corporate name remained Boston Chicken, Inc. until 1997, when the new name became popular and the corporate name was changed to Boston Market Corporation. In 1995, Boston Chicken created the Einstein Bros. Bagels chain of bakery cafés, after acquiring several smaller chains of bagel-centric bakeries. In 1996, the chain launched "Boston Carver Sandwiches", which featured chicken, turkey, ham, and meatloaf; in 1997, due to the success of the sandwich line, "Extreme Carver" sandwiches, filled with larger portions of meat and cheese, were launched. The company raised a lot of debt to finance its expansion. The rapid expansion allowed the company to create a steady stream of revenue from one-time development fees and increasing royalties, but also raised interest rates on its development loans. In 1998, the company filed for Chapter 11 bankruptcy. Since April 1999, a selection of Boston Market-branded items have been available in many supermarkets across the United States. Boston Market was purchased by McDonald's Corporation in May 2000, primarily for its real estate holdings. McDonald's found the brand serviceable, and continued to operate and expand Boston Market. In the early 2000s, Boston Market operated two locations in Toronto, Ontario.
Sources: en.wikipedia.org
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.
The compound is generally handled as light-sensitive and stored cold and dry. Stability in solution depends on solvent, concentration, and storage time. Specific degradation rates are not fully standardized.
Limited water solubility affects formulation for cell and animal studies. Organic co-solvents are often used to dissolve it. Precipitation can confound assay results if not controlled.
Legality depends on the country and the intended use. In many places it is not approved as a medicine and may be sold only as a research chemical. Importation or possession can be restricted, and sports organizations prohibit it.