This is a working overview of circadian rhythm, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-10-27. Anything still debated is marked as such rather than presented as settled.
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.
Preclinical reports describe effects on exercise endurance, mitochondrial content, and lipid profiles in rodents, but these findings come from specific experimental conditions. Many studies use high doses or delivery methods that may not translate directly to human use. SR9009 has been reported to have low oral bioavailability and a short half-life, which complicates interpretation of oral dosing studies. It is not established as safe or effective for any indication. Literature discussions often separate its pharmacological mechanism from unverified claims made in fitness and supplement markets.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. It is not an approved medicine and has no established human therapeutic use. The compound appears in scientific literature as a tool for probing circadian and metabolic regulation. Online sellers often label it as a research chemical, sometimes using the nickname Stenabolic. Its chemical identity is distinct from selective androgen receptor modulators, stimulants, and peroxisome proliferator-activated receptor delta agonists. Researchers use it mainly in cell and animal experiments.
| Property | Value | Notes |
|---|---|---|
| Common name | SR9009 | Also referred to as Stenabolic in non-scientific contexts. |
| Chemical class | Synthetic small molecule | Not a steroid or peptide hormone. |
| Receptor target | REV-ERBα and REV-ERBβ | Nuclear receptor agonist in preclinical studies. |
| Development status | Investigational | No approved human therapeutic indication. |
| Regulatory attention | Prohibited in sport | Listed by anti-doping authorities. |
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.
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.
In rodent studies, SR9009 has been reported to increase mitochondrial content in skeletal muscle and improve exercise endurance under some conditions. These findings led to popular descriptions such as an exercise mimetic, although that term oversimplifies the biology. Effects vary by dose, timing, tissue, and model. The compound's influence on circadian pathways means that time of administration can matter in experiments. Whether similar metabolic changes occur in humans remains largely unexplored in controlled published trials.
Pharmacokinetic data for SR9009 are limited in published literature. Some reports indicate low oral bioavailability and rapid clearance in animals, which complicates interpretation of exposure and effect. Researchers often use injected routes in preclinical work to achieve measurable systemic levels. Analytical studies rely on mass spectrometry to detect the parent compound and its metabolites. Questions about tissue distribution, active metabolites, and long-term consequences remain open. Species differences in metabolism can affect observed half-life and target engagement.
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 and metabolic gene expression. In laboratory experiments, SR9009 binds these receptors and alters transcription of genes involved in lipid handling, glucose metabolism, and mitochondrial function. It is not a naturally occurring compound and has no approved therapeutic use. Research interest stems from its ability to modify energy metabolism in cells and animal models.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ, also called NR1D1 and NR1D2. These receptors help regulate circadian rhythms and metabolic gene programs. The compound was developed for laboratory research, not as an approved therapeutic. Its identity is distinct from steroid hormones and selective androgen receptor modulators. Scientific interest centers on how REV-ERB activation changes gene expression in cells and animal models.
At the molecular level, SR9009 binds the ligand-binding domain of REV-ERB and strengthens recruitment of corepressor proteins such as NCoR and HDAC3. This increases repression of target genes, including Bmal1 and other clock-controlled and metabolic genes. In rodent studies, such changes have been linked to altered lipid handling, glucose metabolism, and energy expenditure. The precise chain of events between receptor binding and whole-body effects remains an active area of research. Findings in animals do not automatically translate to humans.
SR9009 is a synthetic small molecule studied as a REV-ERB agonist. REV-ERBα and REV-ERBβ are nuclear receptors that help regulate circadian rhythms and metabolic gene expression. The compound was identified in academic screening efforts to find synthetic ligands for these receptors. In cell and animal studies, SR9009 alters transcription of genes involved in lipid and glucose metabolism, and it can shift circadian behavior. It is not an approved therapeutic agent.
Mechanistically, SR9009 binds the ligand-binding domain of REV-ERBα/β and enhances recruitment of corepressor complexes. This represses target genes rather than activating them. Because REV-ERB proteins normally compete with ROR proteins at shared response elements, the net effect depends on tissue and timing. Researchers use SR9009 to probe how nuclear receptor signaling links the clock to metabolism, inflammation, and muscle biology. Findings are largely preclinical, and the precise contribution of each receptor subtype remains under study.
SR9009 is frequently discussed in fitness and research-chemical contexts, yet it has no approved medical indication. Regulatory agencies have not authorized it for human use, and it is not a standard prescription drug. Some sports organizations list it as a prohibited substance because of its potential performance-enhancing properties. Published human data are sparse, so claims about its effects in people often rely on animal models or anecdotal reports. Quality and identity of online materials can vary widely.
=== 1948 === January 5: Burma (today Myanmar) becomes independent from the UK through the Burma Independence Act 1947. January 30: Mahatma Gandhi was assassinated. February 25: The Communist Party takes control of Czechoslovakia in the Czechoslovak coup d'état of 1948. March 5: The Berlin Crisis intensifies, according to General Lucius D. Clay March 10: Czechoslovak Foreign Minister Jan Masaryk is reported having committed suicide. March 12: The Costa Rican Civil War begins. March 17: The Treaty of Brussels, an agreement is signed by Britain, France, Belgium, the Netherlands, and Luxembourg, creating a collective defense alliance. (It was the precursor to NATO) April 3: Truman signs the Marshall Plan into effect. By the end of the programs, the United States has given $12.4 billion in economic assistance to Western European countries. April 9: La Violencia begins in Colombia between the Colombian Conservative Party and the Colombian Liberal Party. May 10: A parliamentary vote in southern Korea sees the confirmation of Syngman Rhee as President of the Republic of Korea, after a left-wing boycott. May 14: David Ben-Gurion declares Israeli independence from the United Kingdom. May 15: The British Mandate for Palestine is terminated, and any and all British authority in Palestine ends. As a result, the armies of the Kingdom of Egypt, Transjordan, the Kingdom of Iraq, Syria, Lebanon, Saudi Arabia, and the Kingdom of Yemen entered the former mandate to create an Arab state in Palestine in the place of the State of Israel.
=== General uses === Banana powder has been found to be a "major source of carbohydrate and calories". While it is generally low as a source of protein, the beneficial ingredients of the powder are still "markedly superior to that of other fruits". The powder has also been found to be useful as a general treatment for dyspepsia (indigestion).
Besides inhibiting human acetylcholinesterase (although to a lesser degree than the insect enzyme), carbamate insecticides also target human melatonin receptors. The human health effects of carbamates are well documented in the list of known endocrine disruptor compounds. Clinical effects of carbamate exposure can vary from slightly toxic to highly toxic depending on a variety of factors including such as dose and route of exposure with ingestion and inhalation resulting in the most rapid clinical effects. These clinical manifestations of carbamate intoxication are muscarinic signs, nicotinic signs, and in rare cases central nervous system signs.
=== Todd Barber === Todd Barber (Branden Cook) is Harper's ex-boyfriend from New York. The two remain sexually involved after their breakup, and he helps her forge her university transcripts when she is hired to Pierpoint. Todd later visits Harper in London; the two have a fight after Harper discovers he stole an expensive jacket from a patron at the nightclub they went to, where Todd calls Harper a coward and a hypocrite. Harper cuts ties with him for good.
According to the Salvadoran government, the country's homicide rate was 38 per 100,000 people in 2019; 19.7 per 100,000 in 2020; 17.6 per 100,000 in 2021; 7.8 per 100,000 in 2022; 2.4 per 100,000 in 2023; and 1.9 per 100,000 in 2024. Bukele has attributed the decline to his security policies. According to Celia Medrano, a human-rights lawyer and former general coordinator of the Commission for the Defense of Human Rights of Central America, it is "impossible" ("imposible") to verify the Salvadoran government's homicide figures because there is "no public access" ("no hay acceso público") to a daily homicide registry. Medrano stated that deaths in custody are not registered as homicides. Bodies found in mass graves, missing persons, and people killed in police encounters are not included in the government's homicide statistics. In July 2024, then former United States president Donald Trump falsely accused Bukele's government of "exporting" criminals to the United States to lower El Salvador's crime rate.
Sources: en.wikipedia.org
In Half-Life: Blue Shift, Rosenberg makes his first appearance during the Hazard Course tutorial, long before Calhoun encounters him in the train yards. He can be seen behind the observer's window during the duck-jump portion of the training. Sometime between Gina and Colette's last sight of Rosenberg in Decay and Calhoun's eventual rescue of the scientist in Blue Shift, he tries to enact an escape plan to get out of Black Mesa with the help of several other scientists. During this time, he is captured by soldiers and held captive in a freight car for questioning, while a colleague, Harold, is cornered and fatally wounded. Before Harold dies, Barney Calhoun discovers him, and he instructs Calhoun to find Dr. Rosenberg to help him with his plan. Calhoun is able to reach the train yards and free Dr. Rosenberg. Rosenberg informs him that their plan is to use the equipment in the prototype labs to teleport to safety. He leads Calhoun to the unused part of the complex where two other scientists, Walter Bennett and Simmons, are already preparing the machine. Rosenberg instructs Calhoun that he must activate and align a relay device on Xen in order for them to be able to accurately set their destination. Calhoun travels to Xen and is successful in accomplishing this task, but after returning through the portal back to Earth (it is here that Gina and Colette in Decay, temporarily caught in a harmonic reflux, hear Rosenberg's voice calling Calhoun through the portal), they discover that they need another power cell to replenish the teleporter's power for their escape.
=== Hydrogen isotope formation === 1H, with one proton and no neutrons, is the most abundant nuclide in the Solar System, formed in the earliest rounds of stellar explosions after the Big Bang. After the universe exploded into life, the hot and dense cloud of particles began to cool, first forming subatomic particles like quarks and electrons, which then condensed to form protons and neutrons. Elements larger than hydrogen and helium were produced with successive stars, forming from the energy released during supernovae. Deuterium, 2H, with one proton and one neutron, is also known to have cosmic origin. Like protium, deuterium was produced very early in the universe's history, during Big Bang nucleosynthesis (BBN). As protons and neutrons combined, helium-4 was produced with a deuterium intermediate. Alpha reactions with 4He produce many of the larger elements that dominate today's Solar System. However, before the universe cooled, high-energy photons destroyed any deuterium, preventing larger element formation. This is called the deuterium bottleneck, a restriction on the timeline for nucleosynthesis. All of today's deuterium originated from this proton-proton fusion after enough cooling. Tritium, 3H, with one proton and two neutrons, was produced by proton and neutron collisions in the early universe as well, but it has since radioactively decayed to helium-3. Today's tritium cannot be from BBN, due to tritium's short half-life, 12.3 years. Today's 3H concentration is instead governed by nuclear reactions and cosmic rays.
=== 1971 analysis === The St. Augustine carcass was largely forgotten until 1957, when Forrest Glenn Wood, a curator at the Marineland of Florida and a founding member of the International Society of Cryptozoology, became interested in the story after finding a yellowed newspaper clipping mentioning the creature. Entitled "The Facts About Florida," it read:
== External links == History of Mass Spectrometry - Pioneers - University of New South Wales Sydney Five Mass Spectrometry Nobel Prize Pioneers - Bristol University History of Mass Spectrometry - Scripps Institute
=== Terry "Motor Mouth" Young's suspension === In July 1982, "Valley Girl" was stunted over Philadelphia's "Hot Hits" formatted station WCAU-FM for a short period of time during Terry "Motor Mouth" Young's evening shift on the station (7:00–8:00 PM Eastern). Young was the most popular radio disc jockey (DJ) in all of the Philadelphia radio market at the time. The song was played around ten consecutive times without any commercial interruptions, despite a weather forecast being simulated by Terry himself before sneakily playing the song again. Apparently drowsy after the final play, Terry drunkenly commented on the wrong song ("Abracadabra" by the Steve Miller Band) before the station manager entered the studio and angrily intervened, telling Young to "get out and stay out" before shutting the door on him. Young received a brief suspension from the station, but returned to the studio soon afterward and stayed for four more years until 1986.
Sources: en.wikipedia.org
The situation in which a treatment contrast (e.g. difference between investigational product and control) is dependent on another factor (e.g. centre). A quantitative interaction refers to the case where the magnitude of the contrast differs at the different levels of the factor, whereas for a qualitative interaction the direction of the contrast differs for at least one level of the factor. (ICH E9) Inter-rater reliability
Among the legumes, the soybean is valued for its high (38–45%) protein content as well as its high (approximately 20%) oil content. Soybeans are the most valuable agricultural export of the United States. Approximately 85% of the world's soybean crop is processed into soybean meal and soybean oil, the remainder processed in other ways or eaten whole. Soybeans can be broadly classified as "vegetable" (garden) or field (oil) types. Vegetable types cook more easily, have a mild, nutty flavor, and better texture, are larger in size, higher in protein, and are lower in oil than field types. Tofu, soy milk, and soy sauce are among the top edible commodities made using soybeans. Producers prefer the higher protein cultivars bred from vegetable soybeans originally brought to the United States in the late 1930s. The "garden" cultivars are generally not suitable for mechanical combine harvesting because there is a tendency for the pods to shatter upon reaching maturity.
chromatography Any of a variety of laboratory methods designed to separate a heterogeneous mixture into its component chemical species by first dissolving the mixture in a gas or liquid solvent called the mobile phase and then passing it through a system such as a chromatography column or a capillary tube upon which a material called the stationary phase is fixed. The different species present in the mixture have different affinities for and retention times upon the stationary phase, causing them to separate from the rest of the species in the moving fluid at characteristic rates. This phenomenon is exploited both to detect or measure the relative proportions of analytes present in a mixture, and to purify specific compounds.
The cyclol model was consistent with the general properties then attributed to folded proteins. (1) Centrifugation studies had shown that folded proteins were significantly denser than water (~1.4 g/mL) and, thus, tightly packed; Wrinch assumed that dense packing should imply regular packing. (2) Despite their large size, some proteins crystallize readily into symmetric crystals, consistent with the idea of symmetric faces that match up upon association. (3) Proteins bind metal ions; since metal-binding sites must have specific bond geometries (e.g., octahedral), it was plausible to assume that the entire protein also had similarly crystalline geometry. (4) As described above, the cyclol model provided a simple chemical explanation of denaturation and the difficulty of cleaving folded proteins with proteases. (5) Proteins were assumed to be responsible for the synthesis of all biological molecules, including other proteins. Wrinch noted that a fixed, uniform structure would be useful for proteins in templating their own synthesis, analogous to the Watson-Francis Crick concept of DNA templating its own replication. Given that many biological molecules such as sugars and sterols have a hexagonal structure, it was plausible to assume that their synthesizing proteins likewise had a hexagonal structure. Wrinch summarized her model and the supporting molecular-weight experimental data in three review articles.
Sources: en.wikipedia.org
It is a synthetic compound studied as an agonist of REV-ERB nuclear receptors. It is not an approved medicine and has mainly been examined in laboratory and animal research.
No. It is a small molecule that binds nuclear receptors involved in circadian regulation. Its classification differs from anabolic steroids or peptide hormones.
Published human clinical trial data are lacking. Most safety and activity information comes from preclinical models, so effects in people remain uncertain.
SR9009 is a synthetic REV-ERB agonist used in laboratory research. It is not an approved drug, and its effects in humans are not well characterized. It is often sold as a research chemical under the name Stenabolic.