Everything below concerns NR1D2. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-08-01. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Not approved as a medicine in major jurisdictions | Sold as a research chemical; legal status varies |
| Anti-doping status | Prohibited by the World Anti-Doping Agency | Listed under non-approved substances or related category |
| Typical analytical method | LC-MS/MS | Used for detection and confirmation in biological samples |
| Storage temperature | −20 °C or lower for solid | Desiccated and protected from light |
| Common solution solvents | DMSO; ethanol | Aqueous solubility is limited |
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. These receptors help regulate circadian rhythms, lipid metabolism, and inflammatory gene expression. In cell and animal experiments, SR9009 alters transcription of clock-controlled genes and metabolic pathways. The compound is not a hormone and does not resemble classical steroid structures. Its activity depends on binding to the ligand-binding domain of REV-ERB, where it can modify corepressor recruitment.
Research interest in SR9009 grew from studies of circadian biology and metabolic disease. Preclinical reports describe effects on exercise capacity, muscle metabolism, and blood lipid levels in rodents, but these findings come from controlled laboratory settings. The compound has low oral bioavailability in animals, which limits systemic exposure after swallowing. Investigators often use injected routes in experiments to achieve measurable plasma concentrations. Human clinical data are sparse, no approved therapeutic product exists, and whether animal effects translate to humans remains an open question.
Regulatory and sporting contexts treat SR9009 as a prohibited substance in many elite competitions. Its presence on banned lists reflects concerns about performance enhancement and unknown long-term safety. Analytical chemists have developed methods to detect the parent compound and its metabolites in urine and blood. Literature discussions distinguish between in vitro potency, animal pharmacology, and anecdotal human reports. The latter are difficult to verify because products sold online may lack purity or contain different compounds.
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.
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.
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.
Quality control for research materials includes identity confirmation by nuclear magnetic resonance and purity assessment by high-performance liquid chromatography. Mass spectrometry provides molecular weight confirmation and can detect related impurities. Purchasers should request a certificate of analysis that lists lot-specific data. Online products advertised for human use often lack such documentation. Distinguishing legitimate research material from mislabeled or contaminated samples is a recurring challenge in independent testing, and independent laboratories may use orthogonal methods to verify identity.
== Career == Harrington was a programmer at the video game developer Dynamix and a designer on the Windows NT operating system at Microsoft. In 1996, he founded Valve with Gabe Newell, another former Microsoft employee. Harrington sold his Microsoft shares to fund his half of the startup. His wife at the time, Monica Harrington, was Valve's marketing strategist in its early years. Harrington worked as a programmer on Valve's first game, Half-Life (1998), and funded its development with Newell. It was a critical and commercial success. Harrington said: "At Microsoft you always wonder, 'Is it me being successful or is it Microsoft?' But with Half-Life I knew Gabe and I had built that product and company from scratch." On January 15, 2000, Harrington sold his stake in Valve to Newell and left to spend time with his wife. According to Newell, Harrington did not want to risk another project after the success of Half-Life. In 2006, Harrington co-founded the photo editing service Picnik with his friend and former colleague Darrin Massena. Picnik was acquired by Google in March 2010. Harrington left Google in March 2011. In January 2012, he co-founded another company with Massena, Catnip Labs. Harrington was CTO at the Committee for Children from 2016 to 2018, and CTO of Amplion from November 2018 until March 2020.
== Determining the RTD experimentally == Residence time distributions are measured by introducing a non-reactive tracer into the system at the inlet. Its input concentration is changed according to a known function and the output concentration measured. The tracer should not modify the physical characteristics of the fluid (equal density, equal viscosity) or the hydrodynamic conditions and it should be easily detectable. In general, the change in tracer concentration will either be a pulse or a step. Other functions are possible, but they require more calculations to deconvolute the RTD curve.
An extension of the WAG algorithm is used, with a new PhyML (WAG+Γ4) model taking into account of sites with different evolutionary rates. Qmaker and nQmaker (2021, 2022), programs with the ability to estimate time-reversible and nonreversible matrices from very large datasets quickly. Each provide a general matrix and 5 specialized matrices, for a total of 12 precalculated substitution matrices. Matrices using a selection of proteins based on structural relatedness, as proposed by Benner et al. (1994), Fan (2004), and Steven et al. (2004). Matrices using structural alignments of proteins instead of simple sequence alignment (6 separate publications). Matrices using known physiochemical parameters of amino acid residues (5 separate publications). For a list of more models (including irreversible i.e. asymmetric and/or specialized ones), see the documentation for recent bioinformatic software including IQ-Tree, PhyML, and RAxML.
Sources: en.wikipedia.org
=== Age === Age estimation attempts to determine the skeletal/biological age-at-death. The primary assumption is that an individual's skeletal age is closely associated with their chronological age. Age estimation can be based on patterns of growth and development or degenerative changes in the skeleton. A variety of skeletal series methods to assess these types of changes have been developed. For instance, in children age is typically estimated by assessing dental development, ossification and fusion of specific skeletal elements, or long bone length. For children, different teeth erupt from the gums serially are the most reliable for telling a child's age. However, fully developed teeth are less indicative. In adults, degenerative changes to the pubic symphysis, the auricular surface of the ilium, the sternal end of the 4th rib, and dental attrition are commonly used to estimate skeletal age. Until the age of about 30, human bones keep growing. Different bones fuse at different points of growth. This development can vary across individuals. Wear and tear on bones further complicates age estimates. Often, estimates are limited to 'young' (20–35 years), 'middle' (35–50 years), or 'old' (50+ years).
=== Cardiology === Winrevair (sotatercept) ($0.4 billion in 2024 revenues) is used for the treatment of pulmonary arterial hypertension. Adempas/Verquvo (riociguat / vericiguat) ($0.7 billion in 2024 revenues) is used for the treatment of pulmonary hypertension and to reduce the risk of cardiovascular death and hospitalization in certain patients with heart failure after a recent acute decompensation event.
The International Standard for the Prohibited List is the standard published by the World Anti-Doping Agency (WADA) that lists substances prohibited in competitive sport. It is updated at least once per year as required by the World Anti-Doping Code. The adoption of the first World Anti-Doping Code (the Code) occurred at the 2nd World Conference on Doping in Sport in March 2003 in Copenhagen, Denmark. It was there that WADA assumed the responsibility of maintaining, updating, and publishing the List of Prohibited Substances and Methods (the List) in sport. The List is to be updated and published by WADA at least annually. WADA specifies that the List generally includes any substance that meets any two of the following criteria: it enhances sport performance, it represents a health risk to the athlete, it violates the spirit of sport (as defined in the WADA Code). Substances and techniques that are prohibited by WADA fall into the following categories: S0 non-approved substances; S1 anabolic agents; S2 peptide hormones, growth factors, related substances, and mimetics; S3 beta-2 agonists; S4 hormone and metabolic modulators; S5 diuretics and masking agents; prohibited methods (M1 blood doping, M2 manipulation of samples, M3 gene doping); S6 stimulants; S7 narcotics; S8 cannabinoids; S9 glucocorticoids; P1 beta-blockers.
Sources: en.wikipedia.org
==== Step 1: Initiation ==== The completion of the initiation phase is dependent on the following three events: 1. The recruitment of the ribosome to mRNA 2. The binding of a charged initiator tRNA into the P site of the ribosome 3. The proper alignment of the ribosome with mRNA's start codon
=== Act 1 === W.P. Inman, a Confederate soldier wounded at the Battle of Petersburg, decides to desert from the Confederate Army and return home to Ada Monroe, his beloved who lives at Black Cove Farm, in North Carolina. Inman is aware of the Home Guard, which hunts down deserters from the Confederate Army. The leader of the local Home Guard is Teague, who resorts to such practices as burying deserters alive. On his journey home, Inman meets Solomon Veasey, whom he stops from committing murder. Meanwhile, Ada, once privileged, leads a life of material desperation. Ada meets Ruby, a mountain woman who teaches Ada about hunting and surviving. Inman encounters Veasey again, near a river whilst fleeing the Home Guard, and bargains with him for passage across the river. However, their vessel capsizes and the two drift down the river. The next morning, Lila and her three sisters see Inman and Veasey. Lila's husband drugs the two men before giving them up to the Home Guard. Inman and Veasey are put on a chain gang of deserters. Back at Black Cove Farm, Ruby finds her estranged father, Stobrod, a fiddler. Strobod is trying to steal food. Ruby wants nothing to do with her father, although he asserts that he has reformed his ways. Teague approaches, and Ruby hides her father. She later orders her father to stay away from her. Inman starts an insurrection among the chain gang. The guards shoot the entire chain gang, with a wounded Inman as the only survivor, chained to six dead prisoners. He relives the day he bid Ada farewell, when he thought that the war would last but six months.
With an area of 22,402,200 square kilometres (8,649,500 sq mi), the Soviet Union was the world's largest country, a status that is retained by the Russian Federation. Covering a sixth of Earth's land surface, its size was comparable to that of North America. Two other successor states are also very large — Kazakhstan ranks among the top 10 countries by land area, and Ukraine is the largest country entirely in Europe. The European portion accounted for a quarter of the country's area and was the cultural and economic centre. The eastern part in Asia extended to the Pacific Ocean to the east and Afghanistan to the south, and, except some areas in Central Asia, was much less populous. It spanned over 10,000 kilometres (6,200 mi) east to west across 11 time zones, and over 7,200 kilometres (4,500 mi) north to south. It had five climate zones: tundra, taiga, steppes, desert and mountains. The USSR, like Russia, had the world's longest border, measuring over 60,000 kilometres (37,000 mi), or 1+1⁄2 circumferences of Earth. Two-thirds of it was a coastline. The country bordered Afghanistan, the People's Republic of China, Czechoslovakia, Finland, Hungary, Iran, Mongolia, North Korea, Norway, Poland, Romania, and Turkey from 1945 to 1991. The Bering Strait separated the USSR from the United States, while the La Pérouse Strait separated it from Japan. The country's highest mountain was Communism Peak (now Ismoil Somoni Peak) in Tajikistan, at 7,495 metres (24,590 ft).
As with other ratites, emus have a relatively low basal metabolic rate compared to other types of birds. At −5 °C (23 °F), the metabolic rate of an emu sitting down is about 60% of that when standing, partly because the lack of feathers under the stomach leads to a higher rate of heat loss when standing from the exposed underbelly.
Sources: en.wikipedia.org
Its legal status depends on the country and intended use. It is not an approved medicine in major jurisdictions. In sport, it is prohibited by anti-doping rules.
Laboratories typically use LC-MS/MS to detect SR9009 and related compounds in urine or blood. The method is sensitive but depends on sample collection timing. Confirmatory analysis follows quality-control procedures.
Solid material is generally kept cold, dry, and protected from light. Solutions are often stored in sealed containers at low temperature. Stability beyond recommended periods is not well documented.
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.