Everything below concerns LC-MS/MS. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-03-10. Numbers and descriptions here follow the published literature rather than marketing material.
Identity and purity of SR9009 samples are usually checked with chromatographic and spectrometric methods. High-performance liquid chromatography can separate the compound from related impurities, while mass spectrometry provides molecular mass confirmation. Nuclear magnetic resonance spectroscopy may be used for structural verification in research settings. No single method proves biological activity, and certificates of analysis should be reviewed alongside raw data. Independent testing is often needed because online products vary widely.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Synonyms | SR9009; Stenabolic | Stenabolic is an informal name |
| Common form | Crystalline powder | Supplied in milligram to gram quantities |
| Long-term storage | -20 °C, desiccated, protected from light | Reduces degradation |
| Detection technique | LC-MS/MS | Common in anti-doping and research analysis |
| Regulatory status | Prohibited in sport by WADA | Not approved for human therapeutic use |
At the molecular level, SR9009 binds REV-ERBα and REV-ERBβ and alters their repressive activity on target genes. These nuclear receptors help regulate the circadian clock, lipid synthesis, glucose metabolism, and inflammatory pathways. By changing transcription, the compound can shift the timing or magnitude of downstream metabolic processes in model systems. It does not act through androgen receptors or adenosine receptors, which distinguishes it from several substances sold for athletic performance. Whether the same transcriptional changes occur in humans at tolerable exposures remains an open question because controlled human studies are lacking.
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.
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.
Regulatory agencies have not approved SR9009 for human therapeutic use. It is typically sold as a research chemical with labels stating that it is not for human consumption. The World Anti-Doping Agency prohibits the substance in sport, generally under the category of non-approved substances. Customs and national laws may restrict importation, sale, or possession. Product quality and legal status can vary by country and vendor, and therapeutic claims are not permitted in regulated advertising because the compound lacks approval.
Several misconceptions surround SR9009. It is often described as a SARM, a steroid, or an exercise pill, but its known target is the REV-ERB receptor family. Rodent studies have examined exercise capacity and metabolic markers, yet human outcomes remain unproven. Oral bioavailability appears low in animals, and human pharmacokinetics are not well characterized. Online products may contain impurities or different compounds, so identity and purity testing are important for research use.
Analytical chemists detect SR9009 with liquid chromatography-tandem mass spectrometry, commonly abbreviated LC-MS/MS. Sample preparation may involve protein precipitation, liquid-liquid extraction, or solid-phase extraction before analysis. Laboratories can target the parent compound or its metabolites, depending on the matrix and the purpose of testing. Anti-doping methods require sensitive and specific assays because concentrations in biological samples can be low. Reference standards and validated methods are essential for reliable identification and quantification.
Laboratory identification of SR9009 typically relies on chromatographic separation coupled to mass spectrometry, often with ultraviolet detection as a secondary check. Nuclear magnetic resonance spectroscopy can confirm molecular structure when a reference standard is available. Because many suppliers sell the compound as a research chemical, independent identity testing is important for experimental reproducibility. A single retention time is not sufficient proof of identity, especially when related compounds may be present. Purity assessments usually report a percentage based on area normalization.
SR9009 is generally described as poorly soluble in water and more soluble in organic solvents such as dimethyl sulfoxide and ethanol. Stock solutions are commonly prepared in an organic solvent before dilution into an aqueous buffer or vehicle. Precipitation can occur if the organic fraction is reduced too quickly or if the final concentration exceeds the compound's solubility limit. Sonication or gentle warming may aid dissolution in some protocols, but excessive heat can promote degradation. Container material and pH can also influence observed solubility.
For long-term storage, SR9009 is typically kept as a solid at low temperature, protected from moisture and light. Desiccated conditions limit hydrolysis, while opaque containers reduce photochemical breakdown. Solutions are less stable than solids and are often stored frozen in aliquots to avoid repeated freeze-thaw cycles. Stability data are not standardized across all suppliers, so users should rely on certificate-of-analysis information when available. Degradation may appear as color change, precipitate, or decreased chromatographic purity.
==== Wet spinning ==== Wet-spinning, introduced with rayon fiber production, involves dissolving polymers in a suitable solvent before extrusion. Unlike dry-spinning, the solvent need not be volatile. During wet-spinning, the polymeric solution is extruded through a spinneret into a coagulation bath, leading to a phase inversion and precipitation. Natural and synthetic polymers, including gelatin, alginate, collagen, and cellulose, are processed into fibers via wet-spinning for various tissue engineering applications. This technique enables the production of fibers with large diameters and architectures with high porosity and interconnected open pore structures, facilitating cell penetration, adhesion, and proliferation.
ASTM Shipping Container Standards and Related Technical Material, 5th edition, 2007, ASTM McKinlay, A. H., "Transport Packaging", Institute of Packaging Professionals, 2004 Yam, K.L., "Encyclopedia of Packaging Technology", John Wiley & Sons, 2009, ISBN 978-0-470-08704-6
John Hurrell Crook studied the behaviour of weaverbirds and demonstrated the links between ecological conditions, behaviour, and social systems. Principles from economics were introduced to the study of biology by Jerram L. Brown in his work on explaining territorial behaviour. This led to more studies of behaviour that made use of cost-benefit analyses. The rising interest in sociobiology also led to a spurt of bird studies in this area. The study of imprinting behaviour in ducks and geese by Konrad Lorenz and the studies of instinct in herring gulls by Nicolaas Tinbergen led to the establishment of the field of ethology. The study of learning became an area of interest and the study of bird songs has been a model for studies in neuroethology. The study of hormones and physiology in the control of behaviour has also been aided by bird models. These have helped in finding the proximate causes of circadian and seasonal cycles. Studies on migration have attempted to answer questions on the evolution of migration, orientation, and navigation. The growth of genetics and the rise of molecular biology led to the application of the gene-centered view of evolution to explain avian phenomena. Studies on kinship and altruism, such as helpers, became of particular interest. The idea of inclusive fitness was used to interpret observations on behaviour and life history, and birds were widely used models for testing hypotheses based on theories postulated by W. D. Hamilton and others.
== Diseases == There are some indications that NatB might N-terminally acetylate α-synuclein, a protein involved in Parkinson's disease. α-synuclein is a potential match for NatB enzymatic activity, as the protein starts with MD. N-terminal acetylation of α-synuclein has been found to stabilize the protein and regulate the neuronal toxicity level. NatB is also found to be essential for shutoff activity of PA-X, a protein from Influenza A virus. PA-X influences the gene expression and the immune response in a host, and NatB contributes by shutting off the RNA replication of the virus, even though the mechanism behind this is not known. There are some cancer related phenotypes where NAA20 expression was upregulated in hepatocarcinoma and liver cancer. NAA20 expression was also upregulated in by triple-negative breast cancer cells (TNBC), and studies showed that NAA20 could be targeted by TNBC cells to promote cell proliferation by activating EGFR signaling via Rab5A. Knockdown of NAA20 in vivo showed a decrease in tumor growth There are recent studies involving patients having mutations in the NAA20 gene, which were discovered by genetic screening. These patient mutations were found to affect the enzymatic properties of NatB thus probably being the cause of the various symptoms affecting their lives. These mutations are rare, involving only seven individuals from three different families reported so far, but all various mutations that have been found are on the NAA20 gene.
Pollard MR, Anderson L, Fan C, Hawkins DJ, Davies HM (1991). "A specific acyl-ACP thioesterase implicated in medium-chain fatty acid production in immature cotyledons of Umbellularia californica". Arch. Biochem. Biophys. 284 (2): 306–12. doi:10.1016/0003-9861(91)90300-8. PMID 1989513. Davies HM, Anderson L, Fan C, Hawkins DJ (1991). "Developmental induction, purification, and further characterization of 12:0-ACP thioesterase from immature cotyledons of Umbellularia californica". Arch. Biochem. Biophys. 290 (1): 37–45. doi:10.1016/0003-9861(91)90588-A. PMID 1898097.
Sources: en.wikipedia.org
Single-walled nanotubes are likely candidates for miniaturizing electronics. The most basic building block of these systems is an electric wire, and SWNTs with diameters of an order of a nanometre can be excellent conductors. One useful application of SWNTs is in the development of the first intermolecular field-effect transistors (FET). The first intermolecular logic gate using SWCNT FETs was made in 2001. A logic gate requires both a p-FET and an n-FET. Because SWNTs are p-FETs when exposed to oxygen and n-FETs otherwise, it is possible to expose half of an SWNT to oxygen and protect the other half from it. The resulting SWNT acts as a not logic gate with both p- and n-type FETs in the same molecule. Large quantities of pure CNTs can be made into a freestanding sheet or film by surface-engineered tape-casting (SETC) fabrication technique which is a scalable method to fabricate flexible and foldable sheets with superior properties. Another reported form factor is CNT fiber (a.k.a. filament) by wet spinning. The fiber is either directly spun from the synthesis pot or spun from pre-made dissolved CNTs. Individual fibers can be turned into a yarn. Apart from its strength and flexibility, the main advantage is making an electrically conducting yarn. The electronic properties of individual CNT fibers (i.e. bundle of individual CNT) are governed by the two-dimensional structure of CNTs. The fibers were measured to have a resistivity only one order of magnitude higher than metallic conductors at 300 K (27 °C; 80 °F).
These peptides result from partial proteolysis of intracellular or extracellular protein precursors performed by several processing enzymes or protease complexes (rennin, kallikreins, calpains, prohormone convertases, proteasomes, endosomes, lysosomes), which convert proteins into peptides, including those with biological activities. The resulting protein fragments of various sizes are either readily degraded into free amino acids, or captured by oligopeptidases, whose peculiar binding and/or catalytic properties allow them to fulfill their physiological roles by trimming inactive peptide precursors leading to their active form, converting bioactive peptides into novel ones., inactivating them, thus restraining the continuous activation of specific receptors, or protecting the newly generated bioactive peptide from further degradation, suggesting a peptide chaperon-like activity. TOP, a ubiquitous cytosolic oligopeptidase, is a remarkable example of how this enzyme could play an essential role in immune defense against cancer cells. It has also been successfully used as a hook to fish novel bioactive peptides from cytosol of cells. The involvement of peptides in cell-cell interactions and in neuropsychiatric, autoimmune, and neurovegetative diseases are waiting for peptidomics and gene silencing approaches, which will expedite the formation of new concepts in an emerging era for oligopeptidases. The participation of oligopeptidases in a number of pathologies has long been reported.
=== Development === In the fourth week of development of the human embryo as the respiratory bud grows, the trachea separates from the foregut through the formation of ridges which eventually separate the trachea from the oesophagus, the tracheoesophageal septum. This separates the future trachea from the oesophagus and divides the foregut tube into the laryngotracheal tube. By the start of the fifth week, the left and right main bronchi have begun to form, initially as buds at the terminal end of the trachea. The trachea is no more than 4 mm in diameter during the first year of life, expanding to its adult diameter of approximately 2 cm by late childhood. The trachea is more circular and more vertical in children compared to adults, varies more in size, and also varies more in its position in relation to its surrounding structures.
== Promoter assays == Reporter genes can be used to assay for the activity of a particular promoter in a cell or organism. In this case there is no separate "gene of interest"; the reporter gene is simply placed under the control of the target promoter and the reporter gene product's activity is quantitatively measured. The results are normally reported relative to the activity under a "consensus" promoter known to induce strong gene expression.
Sources: en.wikipedia.org
It is prevalent during early stages of oncogenesis and likely selectively translates proteins needed for cell proliferation. When eIF3a is suppressed, it has shown to decrease the malignancy of breast and lung cancer, most likely due to its role in tumor growth.
Sterilization of Latinas has targeted women of different Latin American identities, including those from Puerto Rico and Mexico for many years in the United States. There is a significant history of such sterilization practices being conducted involuntarily, in a coerced or forced manner, as well as in more subtle forms such as that of constrained choice. Coerced sterilization is defined as any sterilization procedure performed without the patient's full, free, and informed consent. This includes procedures carried out through misinformation, language barriers, or under conditions of institutional pressure. The sterilization of Latinas in the United States is rooted in eugenic ideology and racial discrimination. It has a long history of targeting marginalized groups including women of ethnic and racial minorities, women with disabilities, women with HIV and poor women. Coercive sterilization has also been widley recognized as a violation of fundamental human rights and bodily autonomy. Additionally, forced sterilization was permissible by multiple states throughout various periods in the 20th century. Issues of state sterilization have persisted as recently as September 2020. Some sources credit the practice to theories of racial eugenics.
== Name and discovery == The name Coomassie was adopted at the end of the 19th century as a trade name by the Blackley-based dye manufacturer Levinstein Ltd, in marketing a range of acid wool dyes. In 1896 during the Fourth Anglo–Ashanti War, British forces had occupied the town of Coomassie (modern-day Kumasi in Ghana). In 1918 Levinstein Ltd became part of British Dyestuffs, which in 1926 became part of Imperial Chemical Industries. Although ICI still owns the Coomassie trademark, the company no longer manufactures the dyes. The blue disulfonated triphenylmethane dyes were first produced in 1913 by Max Weiler, who was based in Elberfeld, Germany. Various patents were subsequently taken out on the organic synthesis. Papers published in biochemistry journals frequently refer to these dyes simply as "Coomassie" without specifying which dye was used. In fact, the Colour Index lists over 40 dyes with "Coomassie" in their name. There are also other Coomassie "blue" dyes. For example, the Merck Index (10th edition) lists Coomassie Blue RL (Acid Blue 92, C.I. 13390), which has a completely different structure.
Sources: en.wikipedia.org
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.
Research-grade purity indicates a supplier's measured percentage of the intended compound. It does not guarantee safety, sterility, or suitability for human consumption. Buyers should request a certificate of analysis with chromatograms and test methods.
Sports regulators prohibit SR9009 because it is a non-approved substance with potential performance-altering effects. Its presence can be detected in anti-doping testing. Athletes are responsible for substances found in their samples.
SR9009 is a synthetic compound investigated as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. It is used in preclinical research on circadian rhythm and metabolism. It is not an approved drug.