A practical reference on SR9009: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-02-26. Anything still debated is marked as such rather than presented as settled.
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 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.
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.
| Property | Value | Notes |
|---|---|---|
| Common synonyms | SR9009; Stenabolic | Nickname is not a chemical name. |
| Typical analytical method | LC-MS/MS | Often with isotope-labeled internal standard. |
| Storage temperature | -20 °C | Desiccated and protected from light. |
| Solution stability | DMSO stock; avoid freeze-thaw | Store at -20 to -80 °C. |
| Regulatory status | Not approved; varies by country | May be restricted as research chemical. |
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.
SR9009 is frequently discussed alongside other REV-ERB ligands, including synthetic agonists and natural heme-related molecules. Its selectivity for REV-ERB over related nuclear receptors has been measured in binding and reporter assays, though off-target activity at higher concentrations is possible. The compound is prohibited in sport by the World Anti-Doping Agency, and it is not approved for any medical use in major jurisdictions. Products sold online may be labeled as research chemicals, and their identity and purity are not guaranteed by regulatory review.
SR9009 is a synthetic small molecule that acts on the nuclear receptors REV-ERBα and REV-ERBβ. These receptors are part of the circadian clock machinery and normally repress transcription of certain target genes. In laboratory research, SR9009 is used as a chemical tool to study how REV-ERB activity influences metabolism, inflammation, and daily biological rhythms. The compound is not an approved medicine, and its effects in humans remain largely uncharacterized. It is often described as an investigational agent rather than a therapeutic product.
The mechanism of action involves binding to REV-ERB receptors and recruiting corepressor complexes, which represses target gene transcription. This contrasts with many nuclear receptor agonists that activate transcription. Downstream effects may include changes in autophagy, mitochondrial biogenesis, and lipid handling, but the precise pathways remain an active area of study. Whether these molecular events translate into meaningful physiological effects in humans is unresolved. Most evidence comes from cultured cells and rodent models rather than human participants.
SR9009 is a synthetic small molecule developed as an agonist of the nuclear receptors REV-ERBα (NR1D1) and REV-ERBβ (NR1D2). These receptors help regulate circadian rhythms and metabolic gene expression. In cell and animal studies, SR9009 alters transcription of genes involved in lipid metabolism, inflammation, and mitochondrial function. It is not an approved medicine, and its pharmacological profile in humans remains largely uncharacterized. The compound is frequently discussed in the context of circadian biology and metabolic research rather than clinical use.
Preclinical reports have linked SR9009 to improved endurance and altered energy expenditure in rodents. Such findings have prompted interest in whether REV-ERB activation can influence skeletal muscle metabolism. However, the reported effects depend on dose, route, and experimental model, and replication across laboratories is limited. Human trials have not established comparable outcomes, so claims about exercise performance remain speculative. The absence of controlled human data is a central limitation in interpreting these observations.
As with other chemical reactions, the reaction rate and efficiency of PCR are affected by limiting factors. Thus, the entire PCR process can further be divided into three stages based on reaction progress:
== Tourism == The World Economic Forum's Travel & Tourism Competitiveness Index 2017 Report, ranked Thailand 34 of 136 nations (1=most competitive, 136=least competitive). Other ASEAN nations ranked were: Singapore, 6; Malaysia, 26; Indonesia, 42; Vietnam, 67; Philippines, 79; Laos, 94; Cambodia, 101. International Tourist Arrivals and Receipts: Thailand ranked number nine in 2016, with 32.5 million arrivals. It ranked third in international tourism receipts, US$49.9 billion. Global Destinations Cities Index 2016: In this seventh annual survey published by MasterCard, Bangkok ranked number one of 100 cities worldwide as the top global destination city as determined by number of visitors. It displaced London, the previous number one. Other ASEAN cities ranked in the survey were Singapore, 6; Ho Chi Minh City, 42; Hanoi, 52; Jakarta, 66; and Manila, 74. Travel and Tourism Competitiveness Report 2015: Thailand ranked 35 of 141 nations. Among ASEAN nations, Singapore was ranked 11; Malaysia, 25: Indonesia, 50; Philippines, 74; Vietnam, 75; Laos, 96; Cambodia, 105; and Myanmar, 134. International Tourist Arrivals: Thailand ranked number ten in 2013, up five places from 2012 with 26.5 million arrivals. International Tourist Receipts: Ranked number seven in the world in 2013, up two places from 2012, with receipts estimated at US$42.1 billion. Total tourism contribution to GDP: Thailand ranked 18 of 184 nations in 2014, with travel and tourism income totalling 2,345 billion baht or 19.3 percent of GDP.
== Uses == Purified water is suitable for many applications, including autoclaves, hand-pieces, laboratory testing, laser cutting, and automotive use. Purification removes contaminants that may interfere with processes, or leave residues on evaporation. Although water is generally considered to be a good electrical conductor—for example, domestic electrical systems are considered particularly hazardous to people if they may be in contact with wet surfaces—pure water is a poor conductor. The conductivity of water is measured in Siemens per meter (S/m). Sea-water is typically 5 S/m, drinking water is typically in the range of 5-50 mS/m, while highly purified water can be as low as 5.5 μS/m (0.055 μS/cm), a ratio of about 1,000,000:1,000:1. Purified water is used in the pharmaceutical industry. Water of this grade is widely used as a raw material, ingredient, and solvent in the processing, formulation, and manufacture of pharmaceutical products, active pharmaceutical ingredients (APIs) and intermediates, compendial articles, and analytical reagents. The microbiological content of the water is of importance and the water must be regularly monitored and tested to show that it remains within microbiological control. Purified water is also used in the commercial beverage industry as the primary ingredient of any given trademarked bottling formula, in order to maintain critical consistency of taste, clarity, and color. This guarantees the consumer reliably safe and satisfying drinking.
In 2015, she was a laureate of the L'Oréal-UNESCO For Women in Science Awards "for her groundbreaking work in macromolecular mass spectrometry and pioneering gas phase structural biology by probing the structure and reactivity of single proteins and protein complexes, including membrane proteins." In 2017, she was elected a Foreign Associate of the US National Academy of Sciences. In 2018, she won the Frank H. Field and Joe L. Franklin Award for Outstanding Achievement in Mass Spectrometry from the American Chemical Society. In 2019, she won the Novozymes Prize for "almost single-handedly founding a subfield of mass spectrometry proteomics". Also in 2019 she received the Royal Medal. In 2020, she was chosen as the recipient of the Othmer Gold Medal. In 2021, she received the 2022 Louis-Jeantet Prize for Medicine. and the 2022 European Chemistry Gold Medal by the European Chemical Society. Also in 2021, she became an International Honorary Member of the American Academy of Arts and Sciences. In 2022, she was awarded the Franklin Institute Award for Chemistry. In 2023, she was elected to the American Philosophical Society and was awarded the John B. Fenn Award for Distinguished Contribution to Mass Spectrometry. She was named one of the top ten "Innovators and Trailbalzers" on the 2023 Power List by the Analytical Scientist. In 2024, she received the EPO European Inventor Lifetime Achievement Award for her work in mass spectrometry that significantly advanced biochemical research and medical diagnostics.
Sources: en.wikipedia.org
Naturally occurring cadmium is composed of eight isotopes. Two of them are radioactive, and three are expected to decay but have not measurably done so under laboratory conditions. The two natural radioactive isotopes are 113Cd (beta decay, half-life is 8.04×1015 y) and 116Cd (double beta decay, half-life is 2.69×1019 y). The other three are 106Cd, 108Cd (both double electron capture), and 114Cd (double beta decay); only lower limits on these half-lives have been determined. At least three isotopes – 110Cd, 111Cd, and 112Cd – are stable. Among the isotopes that do not occur naturally, the most long-lived are 109Cd with a half-life of 461.3 days, and 115Cd with a half-life of 53.46 hours. All of the remaining radioactive isotopes have half-lives of less than 7 hours, and the majority have half-lives of less than 5 minutes. Cadmium has 8 known meta states, with the most stable being 113mCd (t1⁄2 = 13.9 years), 115mCd (t1⁄2 = 44.6 days), and 117mCd (t1⁄2 = 3.44 hours).
However, not all were convinced by Fermi's analysis of his results, though he would win the 1938 Nobel Prize in Physics for his "demonstrations of the existence of new radioactive elements produced by neutron irradiation, and for his related discovery of nuclear reactions brought about by slow neutrons". The German chemist Ida Noddack notably suggested in 1934 that instead of creating a new, heavier element 93, that "it is conceivable that the nucleus breaks up into several large fragments." However, the quoted objection comes some distance down, and was but one of several gaps she noted in Fermi's claim. Although Noddack was a renowned analytical chemist, she lacked the background in physics to appreciate the enormity of what she was proposing.
During the period when Germany was divided, the Lower Saxon border crossing at Helmstedt found itself on the main transport artery to West Berlin and, from 1945 to 1990 was the busiest European border crossing point. Of economic significance for the state was the Volkswagen concern, that restarted the production of civilian vehicles in 1945, initially under British management, and in 1949 transferred into the ownership of the newly founded country of West Germany and state of Lower Saxony. Overall, Lower Saxony, with its large tracts of rural countryside and few urban centres, was one of the industrially weaker regions of the federal republic for a long time. In 1960, 20% of the working population worked on the land. In the rest of the federal territory the figure was just 14%. Even in economically prosperous times the jobless totals in Lower Saxony are constantly higher than the federal average. In 1961 Georg Diederichs took office as the minister president of Lower Saxony as the successor to Hinrich Wilhelm Kopf. He was replaced in 1970 by Alfred Kubel. The arguments about the Gorleben Nuclear Waste Repository, that began during the time in office of minister president Ernst Albrecht (1976–1990), have played an important role in state and federal politics since the end of the 1970s. In 1990 Gerhard Schröder entered the office of minister-president. On 1 June 1993, the new Lower Saxon constitution entered force, replacing the "Provisional Lower Saxon Constitution" of 1951.
Headcrabs are a parasitoid alien race found in the Half-Life series of video games, originating in 1998's Half-Life. It is a creature that attacks people, trying to latch onto their head. Upon doing so, it begins to take control of their motor functions, turning them into zombie-like creatures that appear to retain their intelligence and emotions despite lacking the ability to express them in this state. The sequel, Half-Life 2, feature multiple new Headcrabs such as fast and poisonous ones, each creating different Headcrab Zombies. The Half-Life development team was split on making Half-Life: Alyx (2020) a virtual reality game, with the fact that the Headcrabs would be jumping at the player being both an upside and downside depending on the perspective. They initially intended to feature fast Headcrabs and zombies, but opted to not do so when they saw that players struggled too much to deal with them. Critics identified this appearance as particularly terrifying, stating that the inclusion of the Headcrabs justified making the game on a virtual reality platform. The Headcrabs have been generally well received, considered by multiple critics to be a particularly scary and effective monster. Of particular note was their ability to take control of people's bodies, with one critic commenting that the execution was more akin to The Thing (1982) rather than the zombies from George A. Romero's films.
Nicotine is the active chemical constituent in tobacco, which is available in many forms, including cigarettes, cigars, chewing tobacco, and smoking cessation aids such as nicotine patches, nicotine gum, and electronic cigarettes. Nicotine is used widely throughout the world for its stimulating and relaxing effects. Nicotine exerts its effects through the agonism of nicotinic acetylcholine receptors, resulting in multiple downstream effects such as increase in activity of dopaminergic neurons in the midbrain reward system, and acetaldehyde one of the tobacco constituent decreased the expression of monoamine oxidase in the brain. Nicotine is addictive and dependence-forming. Tobacco, the most common source of nicotine, has an overall harm to user and self score 3% below cocaine, and 13% above amphetamines, ranking 6th most harmful of the 20 drugs assessed, as determined by a multi-criteria decision analysis.
Sources: en.wikipedia.org
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.
Solid material is usually kept at -20 °C, desiccated, and protected from light. Dimethyl sulfoxide stocks should be stored cold and subjected to minimal freeze-thaw cycles. Aqueous solutions are generally less stable and should be prepared fresh when possible.
Legality depends on the country and the intended use. It is not an approved medicine, and some places restrict or ban sales for human consumption. Buyers should verify local rules and product documentation before procurement.
Liquid chromatography with mass spectrometry is a common approach. Ultraviolet detection and nuclear magnetic resonance can support identification when suitable standards are available.