Everything below concerns reference standard. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-10-31. Where a claim depends on a specific study, the study is described rather than over-claimed.
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 stability depends on temperature, moisture, light, and solvent. Solid material is generally kept cool and dry, while solutions may require protection from repeated warming and cooling. Degradation can appear as color changes, precipitate, or new chromatographic peaks. Researchers should follow supplier instructions and their own stability data. Long-term storage conditions for human use have not been established because the compound lacks approved clinical formulation.
SR9009 is supplied as a solid research chemical, often in milligram quantities. Laboratories typically weigh it in a controlled environment because fine powders can disperse. Stock solutions are commonly prepared in dimethyl sulfoxide and stored in small aliquots to reduce freeze-thaw cycles. Personal protective equipment and chemical fume hoods are standard when handling unknown or potent compounds. These practices address laboratory safety rather than human use.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic small-molecule REV-ERB agonist | Not a hormone or natural product |
| Primary targets | REV-ERBα and REV-ERBβ | Nuclear receptors involved in circadian and metabolic regulation |
| Appearance | White to off-white solid | Typical for purified research samples |
| Solubility | Soluble in DMSO and ethanol; low water solubility | Laboratory solubility depends on solvent and purity |
| Common synonyms | SR9009; Stenabolic | Stenabolic is a colloquial name, not a formal chemical name |
Detection in biological samples can be complicated by rapid metabolism and low circulating concentrations. Some studies report phase I and phase II metabolites, and analytical methods may need to target those species in addition to the parent compound. Immunoassays are not broadly available, so mass spectrometry remains the main confirmatory approach. For anti-doping testing, laboratories look for SR9009 and its metabolites using validated LC-MS methods. Open questions include how long metabolites remain detectable and how different routes of administration alter detection windows.
In laboratory settings, SR9009 is typically characterized by liquid chromatography–mass spectrometry (LC-MS) or high-performance liquid chromatography with ultraviolet detection (HPLC-UV). These methods can confirm identity and estimate purity, but they require reference standards for accurate quantification. Because SR9009 is not a licensed pharmaceutical, no harmonized pharmacopeial monograph exists. Laboratories often validate in-house methods for matrices such as plasma, urine, or cell culture media. Sample preparation may involve protein precipitation or liquid-liquid extraction before analysis.
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.
SR9009 is a synthetic small molecule developed as a REV-ERB agonist. It binds to REV-ERBα and REV-ERBβ, nuclear receptors that help regulate circadian rhythms and metabolic gene expression. In cell and animal studies, the compound alters lipid and glucose handling and influences skeletal muscle oxidative capacity. Its exact effects in humans remain largely uncharacterized because controlled clinical trials have not been reported. The molecule is frequently described in preclinical literature as a metabolic modulator.
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.
The process for class 1 inteins begins with an N-O or N-S shift when the side chain of the first residue (a serine, threonine, or cysteine) of the intein portion of the precursor protein nucleophilically attacks the peptide bond of the residue immediately upstream (that is, the final residue of the N-extein) to form a linear ester (or thioester) intermediate. A transesterification occurs when the side chain of the first residue of the C-extein attacks the newly formed (thio)ester to free the N-terminal end of the intein. This forms a branched intermediate in which the N-extein and C-extein are attached, albeit not through a peptide bond. The last residue of the intein is always an asparagine (Asn), and the amide nitrogen atom of this side chain cleaves apart the peptide bond between the intein and the C-extein, resulting in a free intein segment with a terminal cyclic imide. Finally, the free amino group of the C-extein now attacks the (thio)ester linking the N- and C-exteins together. An O-N or S-N shift produces a peptide bond and the functional, ligated protein. Class 2 inteins have no nucleophilic first side chain, only an alanine. Instead, the reaction starts directly with a nucleophilic displacement, with the first residue of the C-extein attacking the peptide carboxyl on the final residue of the N-extein. The rest proceeds as usual, starting with Asn turning into a cyclic imide. Class 3 inteins have no nucleophilic first side chain, only an alanine, yet they have an internal noncontiguous "WCT" motif.
Diabetes mellitus is a disease in which the beta cells of the endocrine pancreas either stop producing insulin or can no longer produce it in enough quantity for the body's needs. It is the most common disorder of the endocrine pancreas. The condition is treatable and need not shorten the animal's life span or interfere with the quality of life. If left untreated, the condition can lead to cataracts, increasing weakness in the legs (neuropathy), malnutrition, ketoacidosis, dehydration, and death. Diabetes mainly affects middle-aged and older dogs, but there are juvenile cases. The typical canine diabetes patient is middle-aged, female, and overweight at diagnosis. The number of dogs diagnosed with diabetes mellitus has tripled in thirty years. In survival rates from around the same time, only 50% survived the first 60 days after diagnosis and went on to be successfully treated at home. Currently, diabetic dogs receiving treatment have the same expected lifespan as non-diabetic dogs of the same age and gender.
=== Choanoflagellates === Choanoflagellates, also called "collar-flagellates," are unicellular organisms that exist in both freshwater and oceans. Choanoflagellates have a spherical or ovoid cell body and a flagellum that is surrounded by a 'collar' composed of actin microvilli. The flagellum is used to facilitate movement and food intake. As the flagellum beats, it takes in water through the microvilli attached to the collar, which helps filter out unwanted bacteria and other tiny food particles. Choanoflagellates are composed of approximately 150 species and reproduce by binary fission.
== Physiological immune surveillance == After supra-gingival oral hygiene cleaning, plaque biofilm will quickly develop at the gingival margin and will enter the gingival sulcus after some time. The junctional epithelium, which is at the base of the gingival sulcus, permits plaque bacteria and its toxin to enter the underlying gingival connective tissue via the large spaces between epithelial cells of the junctional epithelium. As a result, inflammation occurs. In clinical gingival health, homeostasis occurs because resident biofilm of plaque bacteria and the host defences (symbiosis) results in a dynamic equilibrium with oral hygiene practices such as brushing and flossing. Therefore, despite having clinical gingival health, a low level of inflammatory infiltrate, consisting of neutrophils, B Cell Lymphocytes and macrophages, is always present in the connective tissue underlying the junctional epithelium. Essentially, this means that histologically, there will always be an inflammatory reaction to bacteria from plaque. The constant low-level inflammatory reaction in the connective tissue underlying the junctional epithelium also results in the formation of the Gingival Crevicular Fluid (GCF). The Gingival Crevicular Fluid (GCF) is a serum like fluid that is formed from the post capillary venules of the Dentogingival Plexus which is a dense network of blood vessels within the gingival connective tissue that is sub-adjacent to the junctional epithelium. The Gingival Crevicular Fluid (GCF) is made up of various components of cells and blood.
Marsha Linehan's biosocial developmental theory posits that BPD arises from the interaction between a child's inherent emotional vulnerability and an invalidating environment—an environment characterized by the neglect, ridicule, dismissal, or discouragement of a child's emotions and needs. Due to it drawing on attachment theory, which centers Western nuclear family norms, the diagnosis of BPD has been critiqued by Indigenous and decolonial scholars for possibly pathologizing Indigenous and collectivist cultural forms of caregiving.
Sources: en.wikipedia.org
are the concentrations of aroma compounds in the interface and emulsion, respectively. With respect to stripping, Agc has the greatest effect on the mass transfer rate. Maximizing the surface area for mass transfer is done by using the smallest bubbles possible when stripping. Assuming spherical structure of the bubbles, the surface area is given by
=== Mesosoma === Both the wings and the 6 legs of the ant are attached to the mesosoma ("thorax"). The legs terminate in a hooked claw which allows them to hook on and climb surfaces. Only reproductive ants (queens and males) have wings. Queens shed their wings after the nuptial flight, leaving visible stubs, a distinguishing feature of queens. In a few species, wingless queens (ergatoids) and males occur.
Even the territorial integrity of the country was in danger: On 7 March 1849, an imperial proclamation was issued in the name of the Emperor Francis Joseph, according to the new proclamation, the territory of Kingdom of Hungary would be carved up and administered by five military districts, while the Principality of Transylvania would be reestablished. These events represented a clear and obvious existential threat for the Hungarian state. The stadion constitution abolished Hungary’s separate constitutional statehood and reduced the Hungarian state to the status of a typical Habsburg province/crownland within a centralized Austrian Empire. The new constrained Stadion Constitution of Austria, the revocation of the April laws and the Austrian military campaign against the Kingdom of Hungary resulted in the fall of the pacifist Batthyány government (which sought agreement with the court) and led to the sudden emergence of Lajos Kossuth's followers in the Hungarian parliament, who demanded the full independence of Hungary. The Austrian military intervention in the Kingdom of Hungary resulted in strong anti-Habsburg sentiment among Hungarians, thus the events in Hungary grew into a war for total independence from the Habsburg dynasty.
=== Chronic pain === Under normal conditions, pain conduction begins with some noxious signal followed by an action potential carried by nociceptive (pain sensing) afferent neurons, which elicit excitatory postsynaptic potentials (EPSP) in the dorsal horn of the spinal cord. That message is then relayed to the cerebral cortex, where we translate those EPSPs into "pain". Since the discovery of astrocyte-neuron signaling, our understanding of the conduction of pain has been dramatically complicated. Pain processing is no longer seen as a repetitive relay of signals from body to brain, but as a complex system that can be up- and down-regulated by a number of different factors. One factor at the forefront of recent research is in the pain-potentiating synapse located in the dorsal horn of the spinal cord and the role of astrocytes in encapsulating these synapses. Garrison and co-workers were the first to suggest association when they found a correlation between astrocyte hypertrophy in the dorsal horn of the spinal cord and hypersensitivity to pain after peripheral nerve injury, typically considered an indicator of glial activation after injury. Astrocytes detect neuronal activity and can release chemical transmitters, which in turn control synaptic activity. In the past, hyperalgesia was thought to be modulated by the release of substance P and excitatory amino acids (EAA), such as glutamate, from the presynaptic afferent nerve terminals in the spinal cord dorsal horn.
The traditional French preparation involves placing a sugar cube on top of a specially designed slotted spoon and placing the spoon on a glass filled with a measure of absinthe. Iced water is poured or dripped over the sugar cube to mix the water into the absinthe. The final preparation contains 1 part absinthe and 3–5 parts water. As water dilutes the spirit, those components with poor water solubility (mainly those from anise, fennel, and star anise) come out of solution and cloud the drink. The resulting milky opalescence is called the louche (/luʃ/, French: 'opaque' or 'shady'). The release of these dissolved essences coincides with a perfuming of herbal aromas and flavours that "blossom" or "bloom", and brings out subtleties that are otherwise muted within the neat spirit. This reflects what is perhaps the oldest and purest method of preparation, and is often referred to as the French method. The Bohemian method is a recent invention that involves fire, and was not performed during absinthe's peak of popularity in the Belle Époque. Like the French method, a sugar cube is placed on a slotted spoon over a glass containing one shot of absinthe. The sugar is soaked in alcohol (usually more absinthe), and then set ablaze. The flaming sugar cube is then dropped into the glass, thus igniting the absinthe. Finally, a shot glass of water is added to douse the flames. This method tends to produce a stronger drink than the French method. A variant of the Bohemian method involves allowing the fire to extinguish on its own.
Sources: en.wikipedia.org
The industrial production of iron or steel consists of two main stages. In the first stage, iron ore is reduced with coke in a blast furnace, and the molten metal is separated from gross impurities such as silicate minerals. This stage yields an alloy – pig iron – that contains relatively large amounts of carbon. In the second stage, the amount of carbon in the pig iron is lowered by oxidation to yield wrought iron, steel, or cast iron. Other metals can be added at this stage to form alloy steels.
== Selected articles == Peerschke EI, Zucker MB. Fibrinogen receptor exposure and aggregation of human blood platelets produced by ADP and chilling. Blood. 1981;57:663–70. Peerschke EI, Grant RA, Zucker MB. Decreased association of 45calcium with platelets unable to aggregate due to thrombasthenia or prolonged calcium deprivation. Br J Haematol. 1980;46:247–56. Peerschke EI. Induction of human platelet fibrinogen receptors by epinephrine in the absence of released ADP. Blood. 1982;60:71–7. Peerschke EI. Evidence for interaction between platelet fibrinogen receptors. Blood. 1982;60:973–8. Peerschke EI, Wainer JA. Examination of irreversible platelet-fibrinogen interactions. Am J Physiol. 1985;248:C466–72. Peerschke EI. Decreased accessibility of platelet-bound fibrinogen to antibody and enzyme probes. Blood. 1989;74:682–9. Peerschke EI, Francis CW, Marder VJ. Fibrinogen binding to human blood platelets: effect of gamma chain carboxyterminal structure and length. Blood. 1986;67:385–90. Peerschke EI, Galanakis DK. The synthetic RGDS peptide inhibits the binding of fibrinogen lacking intact alpha chain carboxyterminal sequences to human blood platelets. Blood. 1987;69:950–2. Peerschke EI. Bound fibrinogen distribution on stimulated platelets. Examination by confocal scanning laser microscopy. Am J Pathol. 1995;147:678–87. Peerschke EI. Maintenance of GPIIb-IIIa avidity supporting "irreversible" fibrinogen binding is energy-dependent. J Lab Clin Med. 1999;134:398–404. Peerschke EI. Reversible and irreversible binding of fibrinogen to platelets. Platelets. 1997;8:311–7.
Chemically, the most common oxidation states of iron are iron(II) and iron(III). Iron shares many properties with other transition metals, including the other group 8 elements, ruthenium and osmium. Iron forms compounds in a wide range of oxidation states, −2 to +7. Iron also forms many coordination complexes; some of them, such as ferrocene, ferrioxalate, and Prussian blue have substantial industrial, medical, or research applications. The body of an adult human contains about 4 grams (0.005% body weight) of iron, mostly in hemoglobin and myoglobin. These two proteins play essential roles in oxygen transport by blood and oxygen storage in muscles. To maintain the necessary levels, human iron metabolism requires a minimum of iron in the diet. Iron is also the metal at the active site of many important redox enzymes dealing with cellular respiration and oxidation and reduction in plants and animals.
Center for Covid Control (CCC) is a pop-up laboratory testing company based in Rolling Meadows, Illinois. It had a peak of 300 testing sites, often in storefronts or temporary buildings. In January 2022 USA Today named the entity in an article about problems with pop-up testing sites, and stated that it was under investigation by several state and federal agencies. CCC has received at least $124 million in federal reimbursements. CCC is associated with Doctors Clinical Laboratory, and shares the same office address. A pigments supplier named DCL Corporation has sent a cease and desist to Doctors Clinical Laboratory for using their trademarked logo. By January 13, 2022, the Doctors Clinical Laboratory was under investigation by the Center for Clinical Standards and Quality, part of Centers for Medicare and Medicaid Services. Investigations in November and December had found serious problems with CCC and DCL, stating "non-compliance" and cited the lab for "immediate jeopardy". CCC announced on January 14, 2022, that it would pause its operations for a week to train staff. On January 19, 2022, the Minnesota Attorney General's Office filed a suit against the company for deceptive practices. Several consumer complaints documented filled out the online testing form but never giving a sample, then receiving a rapid antigen testing report stating their test was negative. The attorney general of Colorado demanded that the company cease COVID testing operations in the state, and the city of Worcester, Massachusetts demanded CCC shut down.
Sources: en.wikipedia.org
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.
It binds REV-ERBα and REV-ERBβ and changes transcription of metabolic genes. This can affect circadian rhythm, lipid use, and mitochondrial function. The full downstream effects are still under study.
No. Some rodent studies show increased endurance, but controlled human trials are lacking. Claims about human performance are not established by published evidence.
Laboratories commonly use liquid chromatography coupled with mass spectrometry to detect SR9009. The method can identify the compound and estimate concentration in a sample. Detection limits depend on the matrix and instrument.