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 2025-10-14. 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.
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.
| 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. |
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.
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.
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.
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.
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.
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.
==== Countercurrent flow examples ==== In a countercurrent heat exchanger, the hot fluid becomes cold, and the cold fluid becomes hot. In this example, hot water at 60 °C (140 °F) enters the top pipe. It warms water in the bottom pipe which has been warmed up along the way, to almost 60 °C (140 °F). A minute but existing heat difference still exists, and a small amount of heat is transferred, so that the water leaving the bottom pipe is at close to 60 °C (140 °F). Because the hot input is at its maximum temperature of 60 °C (140 °F), and the exiting water at the bottom pipe is nearly at that temperature but not quite, the water in the top pipe can warm the one in the bottom pipe to nearly its own temperature. At the cold end—the water exit from the top pipe, because the cold water entering the bottom pipe is still cold at 20 °C (68 °F), it can extract the last of the heat from the now-cooled hot water in the top pipe, bringing its temperature down nearly to the level of the cold input fluid (21 °C (70 °F)). The result is that the top pipe which received hot water, now has cold water leaving it at 20 °C (68 °F), while the bottom pipe which received cold water, is now emitting hot water at close to 60 °C (140 °F). In effect, most of the heat was transferred.
=== Motifs and consensus sequences === The notation [XYZ] means X or Y or Z, but does not indicate the likelihood of any particular match. For this reason, two or more patterns are often associated with a single motif: the defining pattern, and various typical patterns. For example, the defining sequence for the IQ motif may be taken to be:
Luis Luna describes psychedelic experiences as having a distinctly gnosis-like quality, and says that they offer "learning experiences that elevate consciousness and can make a profound contribution to personal development." Czech psychiatrist Stanislav Grof studied the effects of psychedelics like LSD early in his career and said of the experience, that it commonly includes "complex revelatory insights into the nature of existence… typically accompanied by a sense of certainty that this knowledge is ultimately more relevant and 'real' than the perceptions and beliefs we share in everyday life." Traditionally, the standard model for the subjective phenomenological effects of psychedelics has typically been based on LSD, with anything that is considered "psychedelic" evidently being compared to it and its specific effects. Good trips are reportedly deeply pleasurable, and typically involve intense joy or euphoria, a greater appreciation for life, reduced anxiety, a sense of spiritual enlightenment, and a sense of belonging or interconnectedness with the universe. Negative experiences, colloquially known as "bad trips," evoke an array of dark emotions, such as irrational fear, anxiety, panic, paranoia, dread, distrustfulness, hopelessness, and even suicidal ideation. While it is impossible to predict when a bad trip will occur, one's mood, surroundings, sleep, hydration, social setting, and other factors can be controlled (colloquially referred to as "set and setting") to minimize the risk of a bad trip.
=== Cookery Americana Series === Along the Northern Border: Cookery in Idaho, Minnesota, and North Dakota (1973), ISBN 9780405050411 Cooking in Old Creole Days (1973), ISBN 978-0405050466 Cool, Chill and Freeze: A New Approach to Cookery (1973), ISBN 978-0405050442 Directions for Cookery in its Various Branches (1973), ISBN 9780405050503 Fifty Years of Prairie Cooking (1973), ISBN 978-0405050473 Hand-Book of Practical Cookery (1973), ISBN 0-405-05042-9 High Living: Recipes from Southern Climes (1973), ISBN 9780405050510 Home Cookery, Ladies Indispensable Companion: Cookery in Northeastern Cities (1973), ISBN 978-0405050435 The Improved Housewife (1973), ISBN 9780405050558 The Kansas Home Cook-Book (1973), ISBN 9780405050459 Midwestern Home Cookery (1973), ISBN 978-0883940174 Mrs. Porter's New Southern Cookery Book (1973), ISBN 9780405050534 One Hundred Recipes for the Chafing Dish (1973), ISBN 9780405050480 Six Little Cooks (1973), ISBN 9780405050497 Southwestern Cookery: Indian and Spanish Influences (1973), ISBN 978-0405050541
Sources: en.wikipedia.org
Following a Round 22 61-point demolition at the hands of lower-placed Hawthorn, Thompson's job was under immense pressure. After a very public review of the club, it was decided that Thompson should keep his job as senior coach. After a shaky start to the 2007 season that led many supporters to believe that nothing had changed from the 2006 season, Thompson led Geelong to a massive 15 match winning streak (the biggest in a single season in club history) and a 106-point win against the Kangaroos in the Qualifying Final which is the 5th biggest finals winning margin in AFL/VFL history. The 2007 season then culminated in one of the biggest, if not the best highlight of Thompson's career, in both a coaching and footballer's role. Thompson coached Geelong to win the AFL premiership in the 2007 AFL Grand Final by more than 100 points, which was the highest winning margin in Grand Final history, against Port Adelaide Football Club at the MCG on 29 September. It was the club's first premiership since 1963, the year of Thompson's birth. After the Essendon Football Club decided not to give Thompson's former mentor, Kevin Sheedy, a renewal of contract, there was speculation that Mark Thompson would take up the senior coaching role at Essendon for the 2008 season. However, with trade week quickly approaching, the club instead appointed Matthew Knights to the position. After Geelong's record-breaking win in the grand final, Geelong under Thompson were red hot favourite to repeat their 2007 success in the 2008 season and their form during the year did nothing to change that.
== Physiology == MC5R is necessary for normal sebum production. Stimulation of MC5R promotes fatty acid oxidation in skeletal muscle and lipolysis in adipocytes. MC5R is essential for erythrocyte differentiation. MC5R is involved in inflammation. MC5R helps maintain thermal homeostasis. Stimulation of the MC5R in skeletal muscle causes glucose uptake. In vitro, MC5R agonism is cardioprotective and kidney protective. MC5R is expressed in the brain at different levels depending on physical activity.
Octopuses mainly move about by relatively slow crawling with some swimming in a head-first position. Jet propulsion or backward swimming, is their fastest means of locomotion, while crawling is slowest. While crawling, the suckers adhere and detach from the substrate as the animal hauls itself forward with its powerful arm muscles. In 2005, Adopus aculeatus and veined octopus (Amphioctopus marginatus) were found to walk on two arms, while at the same time mimicking plant matter. This form of locomotion allows these octopuses to move quickly away from a potential predator without being recognised. Some species of octopus can crawl out of the water briefly, which they may do between tide pools. "Stilt walking" is used by the veined octopus when carrying stacked coconut shells. The octopus carries the shells underneath it with two arms, and progresses with an awkward gait supported by its remaining arms, which are stiffened.
Improving suppression of hemipteran vectors and bacterial pathogens of citrus and Solanaceous plants: Advances in Antisense Oligonucleotides (FANA). Front. Agron. 3:675247. doi:10.3389/fagro.2021.675247
One barn is 10−28 square metres, about the cross-sectional area of a uranium nucleus. The name probably derives from early neutron-deflection experiments, when the uranium nucleus was described, and the phrases "big as a barn" and "hit a barn door" were used. Barn are typically used for cross sections in nuclear and particle physics. Additional units include the microbarn (or "outhouse") and the yoctobarn (or "shed").
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.
It is a synthetic REV-ERB agonist used mainly in preclinical research. It is not an approved medicine for human use.