circadian rhythm 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 2025-10-11. 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.
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.
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.
| 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 |
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.
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.
Mepsy (formerly Policy Analysis Modeling System (PAMS)) Based on the Policy Analysis Modeling System created by CLASP and the Lawrence Berkeley National Laboratory (LBNL), Mepsy is as an easy-to-use software tool to help local policymakers assess the benefit of standards and labeling programs, and to identify the most attractive targets for appliances and efficiency levels. CLASP Policy Resource Center (CPRC) (formerly Global S&L Database) The CLASP Policy Resource Center is an online resource that allows policy makers and S&L practitioners to compare appliance, lighting, and equipment efficiency policies and regulations across countries and by product; to explore specific information about those policies; and to view and understand the legislative framework and history of S&L by country and economic region. VeraSol (formerly Lighting Global Quality Assurance) VeraSol evolved from Lighting Global Quality Assurance, a quality assurance initiative for off-grid solar products supported by the World Bank. Products in the database display technical information that can be compared across appliance categories and have been undergone testing in certified laboratories.
=== Graphene aerogel === An aerogel made of graphene layers separated by carbon nanotubes was measured at 0.16 milligrams per cubic centimeter. A solution of graphene and carbon nanotubes in a mold is freeze-dried to dehydrate the solution, leaving the aerogel. The material has superior elasticity and absorption. It can recover completely after more than 90% compression, and absorb up to 900 times its weight in oil, at a rate of 68.8 grams per second.
The 100K Wellness Project was a 10-month Framingham-style longitudinal study, organized by Leroy Hood. The pilot phase took place between March and December 2014. Participants submitted integrated data from whole-genome sequencing, gut microbiome, clinical laboratory tests and quantified self measures to provide actionable results for health coaching. It showed actionable opportunities in all participants, and participants followed actionable guidelines about 70 percent of the time. It later would transition into the wellness startup Arivale.
is the density of reagent ions in absence of reactant molecules in the buffer gas, k is the reaction rate constant and t is the average time the ions need to pass the reaction region. With a PTR-MS instrument the number of product and of reagent ions can be measured, the reaction rate constant can be found in literature for most substances and the reaction time can be derived from the set instrument parameters. Therefore, the absolute concentration of trace constituents
== Environmental Impact == Parcel to pallet sized insulated shipping containers have historically been single-use products due to the low-cost material composition of EPS and water-based gel packs. The insulation material typically finds its way into landfill streams as it is not readily recyclable in the United States. The development of reusable high-performance shipping containers have been shown to reduce packing waste by 95% while also contributing significant savings to other environmental pollutants.
Sources: en.wikipedia.org
==== T ==== Tapa – a Philippine food made dried or cured beef, mutton or venison, although other meats or even fish may be used. It is prepared using thin slices of meat that are cured with salt and spices as a method of preserving it. Tolkusha Tsamarella – a Cypriot traditional food. It consists of meat, usually goat meat, that is salted and cured for preservation. The process of preparation traditionally involves drying in the sun. Tyrolean Speck – a distinctively juniper-flavored ham originally from Tyrol, an historical region that since 1918 partially lies in Italy. Tyrolean speck is made from the hind leg of the pig, and is deboned before curing in salt and one of various spice combinations, which may include garlic, bay leaves, juniper berries, nutmeg, and other spices. It is then rested for a period of several weeks, after which, the smoking process begins. It is cold-smoked slowly and intermittently for two or three hours a day for a period of roughly a week using woods such as beech at temperatures that never exceed 20 °C (68 °F). It is then matured for five months.
=== Relaxed control in near-border areas === Bhutan: For example, the relaxed border controls maintained by Bhutan for those not proceeding past Phuentsholing and certain other border cities enable travellers to enter without going through any document check whatsoever. America: The Border Crossing Card issued by American authorities to Mexican nationals enables Mexicans to enter border areas without a passport. Both United States and Bhutan maintain interior checkposts to enforce compliance. China: China maintains relaxed border controls for individuals lawfully in Hong Kong or Macau to visit the surrounding Pearl River Delta visa-free provided that certain conditions are met. Belarus The "Brest – Grodno" visa-free territory, established by a presidential decree signed in August 2019, has permitted local visa-free access to most visitors lawfully present in the neighbouring Schengen Area since 10 November 2019. Visitors are allowed to stay without a visa for 15 days. Entry is possible through designated checkpoints with Poland and Lithuania, Brest-Uschodni Railway Station, Grodno Railway Station, Brest Airport and Grodno Airport. Before travel, visitors must obtain authorisation from a local travel agency in Belarus.
== Breathing apparatus == The definitive equipment for surface-supplied diving is the breathing apparatus which is supplied with primary breathing gas from the surface via a hose, which is usually part of a diver's umbilical connecting the surface supply systems with the diver, sometimes directly, otherwise via a bell umbilical and bell panel.
==== Multi-phase model ==== LNAPLs and DNAPLs can exist in multiple different phases simultaneously upon entering the subsurface environment. The composition of NAPLs is typically described using a multi-phase model that depends on a variety of complex and interrelated parameters, including, but not limited to, viscosity, solubility, and volatility; the possible phases of NAPL include gaseous, solid, aqueous, and immiscible hydrocarbon. The liquid phase of NAPLs is characterized by a physical dividing surface that separates it from the liquid phase of water, indicating immiscibility due to NAPLs' organic structure. That said, some chemical compounds within the NAPL are capable of solubilizing into water, meaning that two liquid phases of NAPL (immiscible hydrocarbon and aqueous solute) can exist simultaneously. The gaseous phase of NAPLs is also responsible for the contamination of groundwater and soil; therefore, the distribution of NAPLs between its various phases is important to quantify in order to assess the extent of contamination and to determine appropriate remediation strategies.
The concept originated from the idea that single stranded DNA or RNA molecules can be electrophoretically driven in a strict linear sequence through a biological pore that can be less than eight nanometers, and can be detected given that the molecules release an ionic current while moving through the pore. The pore contains a detection region capable of recognizing different bases, with each base generating various time specific signals corresponding to the sequence of bases as they cross the pore which are then evaluated. Precise control over the DNA transport through the pore is crucial for success. Various enzymes such as exonucleases and polymerases have been used to moderate this process by positioning them near the pore's entrance.
Sources: en.wikipedia.org
The History of Knoxville, Tennessee, began with the establishment of James White's Fort on the Trans-Appalachian frontier in 1786. The fort was chosen as the capital of the Southwest Territory in 1790, and the city, named for Secretary of War Henry Knox, was platted the following year. Knoxville became the first capital of the State of Tennessee in 1796, and grew steadily during the early 19th century as a way station for westward-bound migrants and as a commercial center for nearby mountain communities. The arrival of the railroad in the 1850s led to a boom in the city's population and commercial activity. While a Southern city, Knoxville was home to a strong pro-Union element during the secession crisis of the early 1860s, and remained bitterly divided throughout the Civil War. The city was occupied by Confederate forces until September 1863, when Union forces entered the city unopposed. Confederate forces laid siege to the city later that year, but retreated after failing to breach the city's fortifications during the Battle of Fort Sanders. Following the war, business leaders, many from the North, established major iron and textile industries in Knoxville. As a nexus between rural towns in Southern Appalachia and the nation's great manufacturing centers, Knoxville grew to become the third-largest wholesaling center in the South.
=== Limb regeneration in animals === In the early 20th century, Albert Mathews seminally correlated regeneration of a cnidarian polyp with the potential difference between polyp and stolon surfaces, and affected regeneration by imposing countercurrents. Amedeo Herlitzka, following on the wound electric currents footsteps of his mentor, du Bois-Raymond, theorized about electric currents playing an early role in regeneration, maybe initiating cell proliferation. Using electric fields overriding endogenous ones, Marsh and Beams astoundingly generated double-headed planarians and even reversed the primary body polarity entirely, with tails growing where a head previously existed. After these seed studies, variations of the idea that bioelectricity could sense injury and trigger or at least be a major player in regeneration have spurred over the decades until the present day. A potential explanation lies on resting potentials (primarily Vmem and TEP), which can be, at least in part, dormant sensors (alarms) ready to detect and effectors (triggers) ready to react to local damage. Following up on the relative success of electric stimulation on non-permissive frog leg regeneration using an implanted bimetallic rod in the late 1960s, the bioelectric extracellular aspect of amphibian limb regeneration was extensively dissected in the next decades. Definitive descriptive and functional physiological data was made possible owing to the development of the ultra-sensitive vibrating probe and improved application devices.
=== Recommended dietary intake === The WHO recommends that both adults and children reduce the intake of free sugars to less than 10% of total energy intake. "Free sugars" include monosaccharides and disaccharides added to foods, and sugars found in fruit juice and concentrates, as well as in honey and syrups. On 20 May 2016, the United States Food and Drug Administration announced changes to the Nutrition Facts panel displayed on all foods, to be effective by July 2018. New to the panel is a requirement to list "added sugars" by weight and as a percentage of Daily Value (DV). For vitamins and minerals, the intent of DVs is to indicate how much should be consumed. For added sugars, the guidance is that 100% DV should not be exceeded. 100% DV is defined as 50 grams. For a person consuming 2000 calories a day, 50 grams is equal to 200 calories and thus 10% of total calories – the same guidance as the WHO. To put this in context, most 12-US-fluid-ounce (355 ml) cans of soda contain 39 grams of sugar. In the United States, a government survey on food consumption in 2013–14 reported that, for men and women aged 20 and older, the average total sugar intakes – naturally occurring in foods and added – were, respectively, 125 and 99 grams per day. The American Heart Association recommends even lower daily consumption of added sugars: 36 grams for men and 25 grams for women.
== History == The first mentioned intoxication goes back to ancient India. Hippocrates mentions a neurological disorder in 46 B.C. in Greece caused by Lathyrus seed. Indian medical classic Bhavaprakasha dating from the sixteenth century mentions it, and even its etiology as kesari dal. During the Spanish War of Independence against Napoleon, grasspea served as a famine food. This was the subject of one of Francisco de Goya's famous aquatint prints titled Gracias a la Almorta ("Thanks to the Grasspea"), depicting poor people surviving on a porridge made from grasspea flour, one of them lying on the floor, already crippled by it. During the Second World War, on the order of Colonel I. Murgescu, commandant of the Vapniarka concentration camp in Transnistria, the detainees – most of them Jews – were fed nearly exclusively with grasspea. Consequently, they became ill from lathyrism.
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.
It is a synthetic research compound that activates REV-ERB nuclear receptors. It is not an approved drug or dietary supplement. Most information comes from cell and animal studies.