LC-MS/MS 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.
Last reviewed on 2025-09-01. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
SR9009 is often grouped with compounds studied for circadian and metabolic regulation rather than with classical anabolic steroids. Its interactions with nuclear receptors differ from those of androgen receptor ligands, and its proposed mechanisms involve transcriptional control rather than direct hormone signaling. Some sources classify it as a metabolic modulator because of observed effects on energy utilization. The distinction matters for regulation and for interpreting research results across different compound classes.
Identity and purity testing for SR9009 commonly uses liquid chromatography coupled with tandem mass spectrometry. This method separates the compound from matrix components and detects it by mass-to-charge transitions, providing sensitive and specific confirmation. Nuclear magnetic resonance spectroscopy can support structural identification, while high-performance liquid chromatography with ultraviolet detection may estimate purity. Because online products labeled as SR9009 may contain other substances or no active compound at all, independent verification is important in research settings. Certificates of analysis are useful but not a substitute for in-house testing.
Laboratory samples of SR9009 are typically supplied as a white to off-white powder. The compound dissolves readily in organic solvents such as dimethyl sulfoxide and ethanol, while its solubility in water is low. Because of this solubility profile, researchers often prepare concentrated stock solutions in an organic solvent before diluting them into aqueous assay buffers. Light exposure, moisture, and repeated freeze-thaw cycles can degrade many small molecules, so handling procedures usually aim to minimize these factors. Purity is commonly checked before use.
Storage conditions for research-grade SR9009 generally involve a freezer at approximately minus twenty degrees Celsius, sometimes lower for long-term preservation. Containers should remain tightly closed and protected from light. Desiccants may be used to limit moisture uptake. Solutions are often stored in aliquots to avoid repeated warming and cooling. Stability data for the compound under various conditions are limited, so laboratories typically follow supplier recommendations and verify performance through periodic analytical checks rather than assuming indefinite stability.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C20H24ClN3O4S | Reported for the free base |
| Molecular weight | 437.9 g/mol | Calculated from the formula |
| Primary target | REV-ERBα and REV-ERBβ | Nuclear receptors involved in circadian regulation |
| Solubility | Soluble in DMSO and ethanol | Poorly soluble in water |
| Typical storage | -20 °C, desiccated | Protect from light and moisture |
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.
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.
In 1998, Firehouse Subs surpassed 10 locations, and later that year opened the first location outside of Florida. In 2000, the founders decided to take a different approach, using consultants to plan franchise growth. They were able to set up financing for potential franchisees. The second wave of franchising began in 2001. In 2011, Firehouse Subs opened its first franchises in the U.S. territory of Puerto Rico, via local franchisee Caribbean Restaurants. By 2012 the company reached 500 locations, ending the year with nearly 600. In July 2016, Firehouse Subs opened its 1,000th location. In 2015, Firehouse Subs opened its first locations in Canada, with its first location opening in Oshawa, Ontario in October with franchisee OnFire Restaurant Group. Currently, the group operates 50 Canadian restaurants, with plans to open a total of 90 in Ontario alone. The chain also launched a loyalty program. In June 2017, Firehouse Subs opened its first airport location at Jacksonville International. In December 2017, the brand's second airport location opened at Orlando International. In April 2018, the chain opened its first on-campus location at Western New England University. In 2020 the chain opened a location at Jacksonville's Baptist Medical Center. On November 15, 2021, Burger King parent Restaurant Brands International announced that it would acquire Firehouse Subs for $1 billion. The acquisition was completed on December 15, 2021. On June 22, 2023, Firehouse Subs opened its first location outside North America in Zurich, Switzerland.
Brendan Lee (born 9 September 1987) is a former professional Australian rules football player at the Essendon Football Club in the Australian Football League (AFL), and most notable for his long career with East Perth in the West Australian Football League (WAFL). Originally from East Perth, Lee made his senior WAFL debut in 2007 at age 19. By 2010, he was a regular senior player for the Royals, and he won the club's best and fairest award in 2011. After sixty games for the club and at age 24, he was recruited to the Australian Football League by Essendon with a late selection in the 2012 Rookie Draft (No. 78 overall). He played two senior games for Essendon during 2012, debuting in Round 20 against North Melbourne at Docklands Stadium, and played in the Victorian Football League for Essendon's VFL-affiliate Bendigo during the season. He was delisted at the end of the season, and returned to East Perth, where he won another club best and fairest in 2013 and became club captain. Lee, along with 33 other Essendon players, was found guilty of using a banned performance-enhancing substance, thymosin beta-4, as part of Essendon's sports supplements program during the 2012 season. He and his team-mates were initially found not guilty in March 2015 by the AFL Anti-Doping Tribunal, but a guilty verdict was returned in January 2016 after an appeal by the World Anti-Doping Agency. He was suspended for two years which, with backdating, ended in November 2016; as a result, he served approximately fourteen months of his suspension and missed the entire 2016 WAFL season.
=== Therapy of oral lichen planus === Oral lichen planus (OLP) is a chronic inflammatory T- cellular disorder that strikes the oral mucosa. In a clinical report in 2022, a fast resolving of OLP was achieved in a patient treated with Abrocitinib. A dose of 200 mg of Abrocitinib was administered daily as monotherapy for twelve weeks. A constant improvement of lesions, a depletion of Wickham striae, and a disappearance of erosions were observed at weeks four and eight of treatment. At week twelve, there was a total recovery of the right buccal mucosa. No adverse events have occurred during the treatment and Abrocitinib was well tolerated by the patient.
Baldwin's famous speech led many to believe the only way to prevent the bombing of British cities was to make a strategic bomber force so large it could, as Baldwin put it, "kill more women and children more quickly than the enemy." Even the highest levels of the RAF came to agree with this policy, publicly stating that their tests suggested that "'The best form of defence is attack' may be all-too-familiar platitudes, but they illustrate the only sound method of defending this country from air invasion. It is attack that counts." As it became clear the Germans were rapidly rearming the Luftwaffe, the fear grew RAF could not meet the objective of winning such a tit-for-tat exchange and many suggested they invest in a massive bomber building exercise. Others felt advances in fighters meant the bomber was increasingly vulnerable and suggested at least exploring a defensive approach. Among the latter group was Lindemann, test pilot and scientist, who noted in The Times in August 1934 that "To adopt a defeatist attitude in the face of such a threat is inexcusable until it has definitely been shown that all the resources of science and invention have been exhausted."
Germany has a social market economy with a highly skilled labour force, a low level of corruption, and a high level of innovation. It is the largest economy in Europe by nominal GDP, as well as the world's third-largest by nominal GDP and sixth-largest by PPP-adjusted GDP. Its PPP-adjusted GDP per capita amounted to 115% of the EU average in 2024. The country's service sector contributes approximately 72% of the total GDP, the industrial sector 27%—with Germany having the largest manufacturing output in Europe—and its agricultural sector 1%, as of 2023. The unemployment rate published by Eurostat amounts to 3.2% as of January 2020, which is the fourth-lowest in the EU. Germany is part of the European single market which represents more than 450 million consumers. In 2017, the country accounted for 28% of the eurozone economy according to the International Monetary Fund. Germany introduced the common EU currency, the euro, in 2002. Its monetary policy is set by the European Central Bank, which is based in Frankfurt, the country's largest financial centre. Germany is the world's third-largest exporter and third-largest importer, and it has the second-largest trade surplus after China. Its largest trading partners in 2025 were China, the United States and the Netherlands. Germany's main exports are vehicles, machinery, and chemical goods. The German automotive industry is among the most competitive and innovative in the world. It was the sixth-largest by production and largest by export value in 2023.
Sources: en.wikipedia.org
== Legal and regulatory status == European Union: In the EU, Good Clinical Practice is backed and regulated by formal legislation contained in the Clinical Trial Regulation (Officially Regulation (EU) No 536/2014 of the European Parliament and of the Council of 16 April 2014 on clinical trials on medicinal products for human use, and repealing Directive 2001/20/EC). A similar guideline for clinical trials of medical devices is the international standard ISO 14155, which is valid in the European Union as a harmonized standard. These standards for clinical trials are sometimes referred to as ICH-GCP or ISO-GCP to differentiate between the two and the lowest grade of recommendation in clinical guidelines. United States: Although ICH GCP guidelines are recommended by the Food and Drug Administration (FDA), they are not statutory in the United States. The National Institutes of Health requires NIH-funded clinical investigators and clinical trial staff who are involved in the design, conduct, oversight, or management of clinical trials to be trained in Good Clinical Practice.
The 5'-hydroxyl group is protected by an acid-labile DMT (4,4'-dimethoxytrityl) group. Thymine and uracil, nucleic bases of thymidine and uridine, respectively, do not have exocyclic amino groups and hence do not require any protection. Although the nucleic base of guanosine and 2'-deoxyguanosine does have an exocyclic amino group, its basicity is low to an extent that it does not react with phosphoramidites under the conditions of the coupling reaction. However, a phosphoramidite derived from the N2-unprotected 5'-O-DMT-2'-deoxyguanosine is poorly soluble in acetonitrile, the solvent commonly used in oligonucleotide synthesis. In contrast, the N2-protected versions of the same compound dissolve in acetonitrile well and hence are widely used. Nucleic bases adenine and cytosine bear the exocyclic amino groups reactive with the activated phosphoramidites under the conditions of the coupling reaction. By the use of additional steps in the synthetic cycle or alternative coupling agents and solvent systems, the oligonucleotide chain assembly may be carried out using dA and dC phosphoramidites with unprotected amino groups. However, these approaches currently remain in the research stage. In routine oligonucleotide synthesis, exocyclic amino groups in nucleosides are kept permanently protected over the entire length of the oligonucleotide chain assembly. The protection of the exocyclic amino groups has to be orthogonal to that of the 5'-hydroxy group because the latter is removed at the end of each synthetic cycle.
As of 2005, India was the only country producing licit opium (opium gum) for both domestic use and export. Licit opium was produced also in Democratic People's Republic of Korea for domestic use, and in Japan for maintenance of the pertinent technology (small quantities). Opium poppies were grown principally for extraction of alkaloids (from poppy straw) in nine other countries: Australia, China, France, Hungary, Slovakia, Spain, the Republic of Macedonia, Turkey, and the United Kingdom. China ceased producing licit opium after 2001. Opium poppies grown principally for the seed crop, with licit poppy straw as a by-product, were produced in the Czech Republic, Serbia and Montenegro. Another six countries cultivated opium poppies solely for the poppy seed or horticultural purposes, without extraction of alkaloids from poppy straw: Austria, Estonia, Germany, Netherlands, Poland, and Ukraine. Illicit production of Polish heroin and other products derived from poppy straw is an ongoing problem in Poland, although it isn't as serious as in the 1980s, after poppies containing high levels of opioid alkaloids were banned in 1990s. The production of licit opium in India was in accord with terms of the 1961 Single Convention on Narcotic Drugs. After the opium was harvested, the plants were allowed to mature and harvested for poppy seeds. The sale of poppy seeds delivered a significant proportion of the income from the licit opium crop. Unknown fractions of both the opium harvest and the poppy straw residue from the poppy seed harvest were diverted to illicit uses.
is the concentration of the solid in the diffusion layer surrounding the solid. D is the diffusion coefficient. L is the diffusion layer thickness. As can be inferred from the Noyes–Whitney equation, the rate of dissolution may be modified primarily by altering the surface area of the solid by altering the particle size (e.g., with micronization). For many drugs, reducing the particle size reduces the dose needed to achieve the same therapeutic effect. The particle size reduction increases the specific surface area and the dissolution rate and does not affect solubility. The rate of dissolution may also be altered by choosing a suitable polymorph of a compound. Different polymorphs have different solubility and dissolution rate characteristics. Specifically, crystalline forms dissolve slower than amorphous forms since they require more energy to leave the lattice during dissolution. The stablest crystalline polymorph has the lowest dissolution rate. Dissolution also differs between anhydrous and hydrous forms of a drug. Anhydrous forms often dissolve faster but sometimes are less soluble. Esterification is also used to control solubility. For example, stearate and estolate esters of drugs have decreased solubility in gastric fluid. Later, esterases in the gastrointestinal tract (GIT) wall and blood hydrolyze these esters to release the parent drug. Coatings on a tablet or pellet may act as barriers to reducing the dissolution rate. Coatings may also be used to control where dissolution takes place.
SPECULOOS-3 b, an exoplanet nearly identical in size to Earth, is discovered orbiting an ultracool dwarf star as small as Jupiter and located 55 light-years from Earth. Solar energy is combined with synthetic quartz to generate temperatures of more than 1,000°C. This proof-of-concept method shows the potential of clean energy to replace fossil fuels in heavy manufacturing, according to a research team at ETH Zurich. 16 May – A multimodal algorithm for improved sarcasm detection is revealed. Trained on a database known as MUStARD, it can examine multiple aspects of audio recordings and has 75% accuracy. 17 May – The world's smallest quantum light detector on a silicon chip is demonstrated, 50 times smaller than their previous version. 20 May – The first measurements of an exoplanet's core mass are obtained by the James Webb Space Telescope. This reveals a surprisingly low amount of methane and a super-sized core within the super-Neptune WASP-107b. 23 May New images from the Euclid space telescope are published, including a view of the Messier 78 star nursery. Astronomers using TESS report the discovery of Gliese 12 b, a Venus-sized exoplanet located 40 light-years away, with an equilibrium temperature of 315 K (42 °C; 107 °F). This makes it the nearest, transiting, temperate, Earth-sized world located to date. A team shows that iron instead of cobalt and nickel can be used as a cathode material in lithium-ion batteries, improving both safety and sustainability.
Sources: en.wikipedia.org
Lead poisoning (Pb), in contrast to arsenic poisoning, is caused by industrial materials, such as leaded gasoline and lead leached from plumbing. Use of leaded gasoline has declined precipitously since the 1970s. Lead (from lead(II) azide or lead styphnate used in firearms) gradually accumulates at firearms training grounds, contaminating the local environment and exposing range employees to a risk of lead poisoning. Beryllium poisoning (Be) is attributed to the ability of Be2+ to replace Mg2+ in some enzymes. Be has been classified by one agency as a carcinogen. Cadmium poisoning (Cd) came into focus with the discovery of itai-itai disease due to cadmium-contaminated waters resulting from mining in the Toyama Prefecture starting around 1912. The term refers to the severe pains (Japanese: 痛い, romanized: itai) people with the condition felt in the spine and joints. Cd2+ is thought to accumulate in the kidneys, where it tightly binds to the sulfur in cysteine-containing proteins. Cadmium is also present as a material used in many electronic devices, thus it can leach into groundwater after being disposed of into landfills of electronic waste. Chromium poisoning (Cr) is primarily due to hexavalent chromium, Cr+6, creating as a side effect of industrial processes. While hexavalent chromium is a known human carcinogen, and it has become widespread in the environment, the impact of environmental contamination with this element are not known. Mercury poisoning (Hg) came into sharp focus with the discovery of Minamata disease, named for the Japanese city of Minamata.
From the mid-1980s onward, the media reported "roid rage" as a side effect of AAS. A 2005 review determined that some, but not all, randomized controlled studies have found that AAS use correlates with hypomania and increased aggressiveness, but pointed out that attempts to determine whether AAS use triggers violent behavior have failed, primarily because of high rates of non-participation. A 2008 study on a nationally representative sample of young adult males in the United States found an association between lifetime and past-year self-reported AAS use and involvement in violent acts. Compared with individuals that did not use steroids, young adult males that used AAS reported greater involvement in violent behaviors even after controlling for the effects of key demographic variables, previous violent behavior, and polydrug use. A 1996 review examining the blind studies available at that time also found that these had demonstrated a link between aggression and steroid use, but pointed out that with estimates of over one million past or current steroid users in the United States at that time, an extremely small percentage of those using steroids appear to have experienced mental disturbance severe enough to result in clinical treatments or medical case reports. The relationship between AAS use and depression is inconclusive. A 1992 review found that AAS may both relieve and cause depression, and that cessation or diminished use of AAS may also result in depression, but called for additional studies due to disparate data.
== Current usage == Many "omes" beyond the original "genome" have become useful and have been widely adopted by research scientists. "Proteomics" has become well-established as a term for studying proteins at a large scale. "Omes" can provide an easy shorthand to encapsulate a field; for example, an interactomics study is clearly recognisable as relating to large-scale analyses of gene-gene, protein-protein, or protein-ligand interactions. Researchers are rapidly taking up omes and omics, as shown by the explosion of the use of these terms in PubMed since the mid-1990s.
The grant proposal was turned over for peer review, and one of the reviewers was Steven Jones of Brigham Young University. Jones had worked for some time on muon-catalyzed fusion, a known method of inducing nuclear fusion without high temperatures, and had written an article on the topic entitled "Cold nuclear fusion" that had been published in Scientific American in July 1987. Fleischmann and Pons and co-workers met with Jones and co-workers on occasion in Utah to share research and techniques. During this time, Fleischmann and Pons described their experiments as generating considerable "excess energy", in the sense that it could not be explained by chemical reactions alone. They felt that such a discovery could bear significant commercial value and would be entitled to patent protection. Jones, however, was measuring neutron flux, which was not of commercial interest. To avoid future problems, the teams appeared to agree to publish their results simultaneously, though their accounts of their 6 March meeting differ.
Sources: en.wikipedia.org
It is a synthetic REV-ERB agonist used mainly in preclinical research. It is not an approved medicine for human use.
It binds to REV-ERBα and REV-ERBβ, nuclear receptors involved in circadian and metabolic gene regulation. This can alter transcription of genes related to lipid and glucose metabolism in experimental models.
No controlled human trials have established that effect. Endurance findings come primarily from rodent studies, and human responses remain unknown.
Research-grade SR9009 is typically stored frozen at about minus twenty degrees Celsius, protected from light and moisture. Stock solutions are often kept in aliquots to avoid repeated freeze-thaw cycles. Specific storage conditions should follow the supplier's documentation.