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.
Updated 2025-12-06. Numbers and descriptions here follow the published literature rather than marketing material.
In laboratory settings, SR9009 is commonly identified by its molecular structure and its interaction with REV-ERB receptors. Vendors may list it under synonyms such as Stenabolic or REV-ERB agonist, but those names do not define purity or identity. Analytical confirmation typically uses high-performance liquid chromatography with ultraviolet detection or liquid chromatography–mass spectrometry. A reference standard is needed to compare retention time and mass spectrum, because the compound can be confused with related research chemicals.
Handling practices for SR9009 focus on minimizing degradation and contamination. The solid is generally stored desiccated at or below -20 °C, protected from light and moisture. Stock solutions are often prepared in dimethyl sulfoxide or ethanol, then aliquoted to avoid repeated freeze–thaw cycles. Aqueous solubility is low, so formulations for animal studies may require cosolvents or suspending agents. Personnel should follow institutional chemical safety procedures, because toxicological data for humans are incomplete.
Regulatory status varies by country and intended use. Major drug agencies have not granted marketing authorization for SR9009 as a medicine, and it is not listed as a controlled substance in many jurisdictions. It is often sold as a research chemical, a category that may fall outside pharmaceutical manufacturing rules. Buyers should verify local laws and supplier documentation, including certificates of analysis. The lack of standardized quality controls raises concerns about identity, purity, and actual content in products marketed online.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white solid | Visual inspection is not sufficient for identity. |
| Solubility | Soluble in DMSO and ethanol | Low solubility in water. |
| Typical storage | -20 °C, desiccated, dark | Protect from repeated temperature changes. |
| Common analytical method | LC-MS or HPLC-UV | Reference standard required for comparison. |
| Common synonyms | SR9009; Stenabolic; REV-ERB agonist | Vendor naming may vary. |
Regulatory treatment of SR9009 varies by country and context. It is not approved as a therapeutic drug by agencies such as the United States Food and Drug Administration or the European Medicines Agency. Sports authorities list it as a prohibited substance; the World Anti-Doping Agency classifies it among hormone and metabolic modulators. Legal status for personal possession or sale differs across jurisdictions, and some countries may restrict it under analog or research chemical laws. Buyers who seek verified material often rely on independent laboratory testing because online product labels may not match contents.
Laboratory samples of SR9009 are typically handled as research chemicals rather than pharmaceuticals. Suppliers usually state that the material is for research use only and not for human or veterinary administration. Storage recommendations generally call for a freezer at approximately −20 °C, protection from light, and a desiccated environment. The solid is often described as a white to off-white powder. Solubility is commonly reported in organic solvents such as dimethyl sulfoxide and ethanol, with low solubility in water.
Analytical identification and purity assessment often use high-performance liquid chromatography with ultraviolet detection or mass spectrometry. Liquid chromatography–tandem mass spectrometry is used to detect and quantify SR9009 in biological matrices, including urine and blood, for anti-doping or pharmacokinetic studies. Nuclear magnetic resonance spectroscopy can confirm molecular structure. Stability depends on form and storage: the solid is generally more stable than solutions, and repeated freeze–thaw cycles may degrade samples. Purity is typically reported as a percentage from a certificate of analysis.
Because REV-ERB receptors are core clock components, SR9009 has been examined for effects on daily rhythms as well as metabolism. Research has explored whether the compound can shift or reinforce circadian gene expression in tissues such as liver and muscle. Some studies report improved metabolic markers in obese or diabetic mice, while others show context-dependent responses. Questions remain about which effects are direct, which are secondary to timing, and how they might differ across species.
SR9009 is a synthetic small molecule studied as an agonist of REV-ERB nuclear receptors. REV-ERB alpha and REV-ERB beta help regulate circadian rhythms and metabolic gene expression. In laboratory research, SR9009 has been used to probe how these receptors affect skeletal muscle, liver, and adipose tissue. The compound was identified in academic drug-discovery work and is often described in scientific literature by its chemical name and research code. It is not an approved medicine, and human clinical data remain limited or absent.
==== Cell surface receptors ==== The extracellular environment is able to induce changes within the cell. Hormones, or other extracellular signals, are able to induce changes within the cell by binding to cell surface receptors also known as transmembrane receptors. This interaction allows the hormone receptor to produce second messengers within the cell to aid response. Second messengers may also be sent to interact with intracellular receptors in order to enter the complex signal transport system that eventually changes cellular function. G-protein-coupled membrane receptors (GPCR) are a major class of transmembrane receptors. The features of G proteins include GDP/GTP binding, GTP hydrolysis and guanosine nucleotide exchange. When a ligand binds to a GPCR the receptor changes conformation, which makes the intracellular loops between the different membrane domains of the receptor interact with G proteins. This interaction causes the exchange of GDP for GTP, which triggers structural changes within the alpha subunit of the G protein. The changes interrupts the interaction of the alpha subunit with the beta–gamma complex and which results in a single alpha subunit with GTP bound and a beta–gamma dimer. The GTP–alpha monomer interacts with a variety of cellular targets. The beta–gamma dimer also can stimulate enzymes within the cells for example, adenylate cyclase but it does not have as many targets as the GTP–alpha complex.
=== Hyperpyrexia === Hyperpyrexia is an extreme elevation of body temperature which, depending upon the source, is classified as a core body temperature greater than or equal to 40 or 41 °C (104 or 106 °F); the range of hyperpyrexia includes cases considered severe (≥ 40 °C) and extreme (≥ 42 °C). It differs from hyperthermia in that one's thermoregulatory system's set point for body temperature is set above normal, then heat is generated to achieve it. In contrast, hyperthermia involves body temperature rising above its set point due to outside factors. The high temperatures of hyperpyrexia are considered medical emergencies, as they may indicate a serious underlying condition or lead to severe morbidity (including permanent brain damage), or to death. A common cause of hyperpyrexia is an intracranial hemorrhage. Other causes in emergency room settings include malignant catatonia, sepsis, Kawasaki syndrome, neuroleptic malignant syndrome, drug overdose, serotonin syndrome, and thyroid storm.
=== Load carrying equipment === 1937 pattern web equipment - Used until the early 1960s, in limited use with Territorial Army and other second-line troops until the mid to late 1970s. 1944 pattern web equipment - Used in tropical conditions 1958 pattern web equipment - Used from the late 1950s until the early 1990s Personal Load Carrying Equipment - Trialled from the mid-1980s to the late 1980s, adopted by the (very) late 1980s
Wing Commander (now Group Captain) Christopher Hugh Moran, , (5202768). Wing Commander Stephen Ronald Sims (5203336). Wing Commander Robert Adrian Williams (5204463). Civil Division Mavis Ainsworth, lately Director, School of Cultural Studies, Sheffield Hallam University. For services to Education. Edward Aldridge, , Member, Moray Council. For services to Local Government. Graeme Yorkston Alexander, Chief Executive Officer, Devro International plc. For services to the Food Industry. Anthony Paul Allen, County Trading Standards Officer, East Sussex County Council. For services to Trading Standards and to Consumer Protection. Elizabeth Anne Allen, lately Director of Nursing, North West Anglia Healthcare Trust. For services to Health Care. Ian George Allen, Valuation Principal, Board of Inland Revenue. William Claude Allington. For political and public service. Professor Richard Edward Allsop, Professor of Transport Studies, University College London. For services to Traffic Management and Road Safety. John Victor Ronald Anderson. For political service. D. Michael Archer. For services to the Advisory Board for Redundant Churches. John D. Ault, Chair, Corporation of Yeovil College. For services to Education. David Bailey, Director of Development, London Underground. For services to Public Transport in London. Professor Andrew David Bain, Board Member, Scottish Enterprise. For services to the Scottish Economy. Edward John Meldrum Ball, lately Director, Oil Companies International Marine Forum. For services to Maritime Safety to the Environment. Helen Rae Bamber.
Sources: en.wikipedia.org
In FFF the display of detector signals as a function of time is called fractogram, in contrast to the chromatogram of column chromatography techniques. The fractogram can be converted to a distribution plot of one or several physical properties of the analyte using FFF theory and/or detector signals. This can be size, molar mass, charge, etc. Often these substances are particles initially suspended in a small volume of a liquid buffer and pushed along the FFF channel by the buffer. The varying velocities of a particular species of particles may be due to its size, its mass, and/or its distance from the walls of a channel with non-uniform flow-velocity. The presence of different species in a sample can thus be identified through detection of a common property at some distance down the long channel, and by the resulting fractogram indicating the presence of the various species by peaks, due to the different times of arrival characteristic of each species and its physical and chemical properties.
To claim this reward, a special transaction called a coinbase is included in the block, with the miner as the payee. All bitcoins in existence have been created through this type of transaction. This reward is halved every 210,000 blocks until ₿21 million have been issued in total, which is expected to occur around the year 2140. Afterward, miners will only earn from transaction fees. These fees are determined by the transaction's size and the amount of data stored, measured in satoshis per byte. The proof of work system and the chaining of blocks make blockchain modifications very difficult, as altering one block requires changing all subsequent blocks. As more blocks are added, modifying older blocks becomes increasingly challenging. In case of disagreement, nodes trust the longest chain, which required the greatest amount of effort to produce. To tamper or censor the ledger, one needs to control the majority of the global hashrate. The high cost required to reach this level of computational power secures the bitcoin blockchain. The environmental impact of bitcoin mining is controversial and has attracted the attention of regulators, leading to restrictions or incentives in various jurisdictions. As of 2025, a non-peer-reviewed study by the Cambridge Centre for Alternative Finance (CCAF) estimated that bitcoin mining represented 0.5% of global electricity consumption and 0.08% of world greenhouse gas emissions, comparable to Slovakia's emissions. About half of the electricity used is generated through fossil fuels.
== Research == Since 2009 the Foundation has sponsored numerous clinical trials conducted by the Waterford Institute of Technology, and has funded numerous Fellowships, the principal bequest being a Chair in Human Nutrition funded permanently by it from October 2016, the current holder being Professor John Nolan PhD.
In electron capture, some proton-rich nuclides were found to capture their own atomic electrons instead of emitting positrons, and subsequently, these nuclides emit only a neutrino and a gamma ray from the excited nucleus (and often also Auger electrons and characteristic X-rays, as a result of the re-ordering of electrons to fill the place of the missing captured electron). These types of decay involve the nuclear capture of electrons or emission of electrons or positrons, and thus acts to move a nucleus toward the ratio of neutrons to protons that has the least energy for a given total number of nucleons. This consequently produces a more stable (lower energy) nucleus. A hypothetical process of positron capture, analogous to electron capture, is theoretically possible in antimatter atoms, but has not been observed, as complex antimatter atoms beyond antihelium are not experimentally available. Such a decay would require antimatter atoms at least as complex as beryllium-7, which is the lightest known isotope of normal matter to undergo decay by electron capture.
=== Long term exposure of residents living near medical supply warehouses === Residents living near Cardinal Health's warehouse, which holds sterilized medical supplies, in El Paso Texas reported respiratory symptoms in 2021. Some sources estimate these large warehouses holding sterilized medical equipment outgas more ethylene oxide than some sterilization plants due to laxer regulations. Further investigation discovered people living near these warehouses are being exposed to ethylene oxide levels sufficient to increase cancer risk to more than 1 in 10,000.
Sources: en.wikipedia.org
Santa Montefiore, author (convert) Simon Sebag Montefiore, author and Haaretz journalist;Jerusalem: The Biography was a number one non-fiction Sunday Times bestseller and a global bestseller and won The Jewish Book of the Year Award from the Jewish Book Council; descended from the banker Sir Joseph Sebag-Montefiore, the nephew and heir of the wealthy philanthropist Sir Moses Montefiore, considered by some "the most important Jew of the 19th century". Simon's mother was Phyllis April Jaffé (1927–2019) from the Lithuanian branch of the Jaffe family. The Montefiore family are descended from a line of wealthy Sephardi Jews who were diplomats and bankers all over Europe and who originated from Morocco and Italy. Eric Moonman (29 April 1929 – 22 December 2017) was Labour politician, chair of Poale Zion (Great Britain), president of Zionist Federation of Great Britain and Ireland; author of book The Violent Society; did consultancy work for ITN as expert in counter-terrorism'; appointed as member of the advisory board of the Centre for Counter Terrorism Studies at the Potomac Institute for Policy Studies. Benny Morris (Hebrew: בני מוריס; born 8 December 1948) Israeli historian of British Jewish ancestry;member of the group of Israeli historians known as the "New Historians", a term Morris coined to describe himself and historians Avi Shlaim, Ilan Pappé and Simha Flapan; Morris's work on the Arab–Israeli conflict and especially the Israeli–Palestinian conflict has won praise and criticism from both sides of the political divide. Morris regards himself as a Zionist.
Eschar (; Greek: ἐσχάρᾱ, romanized: eskhara; Latin: eschara; or an eschar) is a slough, or piece of dead tissue that is cast off from the surface of the skin, particularly after a burn injury, but also seen in gangrene, ulcer, fungal infections, necrotizing spider bite wounds, tick bites associated with spotted fevers, and exposure to cutaneous anthrax. The term "eschar" is not interchangeable with "scab." An eschar contains necrotic tissue whereas a scab is composed of dried blood and exudate.
On the Western front, President Reagan's administration had taken a hard line against the Soviet Union. Under the Reagan Doctrine, the Reagan administration began providing military support to anti-communist armed movements in Afghanistan, Angola, Nicaragua and elsewhere. Reagan had also ordered the implementation of the Strategic Defense Initiative (SDI) in 1983—a space-based interceptor program against nuclear missiles more commonly dubbed "Star Wars" by the media—an initiative that alarmed and "horrified the Soviets," who while doubting its feasibility, were in no position to compete technologically. By November 1985, the Soviets perceived SDI as both a military threat and as a potential means by which the United States might weaken NATO cohesion and alter the strategic balance in nuclear weapon technology. At the same time, officials in the Kremlin expressed concern that the deployment of space-based missile defenses would destabilize strategic parity and could make nuclear war more likely rather than less. A major breakthrough came in 1985–87, with the successful negotiation of the Intermediate-Range Nuclear Forces Treaty (INF).
Trump also signed an executive order attempting to end birthright citizenship for children of unauthorized immigrants as well as immigrants legally but temporarily present in the United States. At least nine lawsuits have been filed challenging the order on constitutional grounds, and as of February 2025, four federal judges have issued preliminary injunctions blocking its implementation and enforcement nationwide. On June 27, the Supreme Court limited the ability of individual District Judges to issue injunctions against executive actions, meaning to pause executive action. The Supreme Court did not rule on the merits of birthright citizenship. District Judges can still issue injunctions in limited circumstances, such as for persons directly involved in a class action lawsuit. On January 22, 2025, Trump ended the policy from 2011 which prohibited immigration arrests in sensitive areas such as courthouses, schools, churches, and hospitals, or during funerals and weddings. NPR reported that a "growing number" of Democrat and Republican officials in cities, states, police departments, school districts and other local governments stated they would not assist in migrant raids citing public safety, civil rights, and administrative capability concerns. On January 29, Trump signed the Laken Riley Act into law, the first legislation of his second term. On the same day, he signed a presidential memorandum to begin expansion of the Guantanamo Migrant Operations Center to house up to 30,000 migrants under detention, separate from the high security military prison at Guantanamo Bay.
It can be difficult to access the proper supplies and facilities, and in some regions, it may not be possible to perform blood cultures at all. It is important that the bottles are neither underfilled nor overfilled: underfilling can lead to false negative results as fewer organisms are present in the sample, while overfilling can inhibit microbial growth because the ratio of growth medium to blood is comparatively lower. A 1:10 to 1:5 ratio of blood to culture medium is suggested to optimize microbial growth. For routine blood cultures in adults, the Clinical and Laboratory Standards Institute (CLSI) recommends the collection of two sets of bottles from two different draws, with 20–30 mL of blood drawn in each set. In children, the amount of blood to be drawn is often based on the child's age or weight. If endocarditis is suspected, a total of six bottles may be collected.
Sources: en.wikipedia.org
Liquid chromatography–mass spectrometry is common for identity and purity checks. High-performance liquid chromatography with ultraviolet detection can also be used. Both methods require a suitable reference standard.
The solid is usually kept desiccated at -20 °C or lower and protected from light. Stock solutions are aliquoted to limit freeze–thaw cycles. Aqueous solutions are not generally recommended for long-term storage.
Laws differ by country and by intended use. It is not an approved medicine, and many vendors sell it as a research chemical. Purchasers are responsible for confirming local restrictions.
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.