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 2026-05-29. 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.
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.
| 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. |
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.
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.
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.
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.
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.
In Cape Town, for example, the wealthiest 14% of the population use half of the city's water, while the poorest 62% use just a quarter. 11 April – A study reports that genomic surveillance (GS) shows that a clonal lineage of the wheat blast fungus has spread worldwide and that there is a need for GS to track and mitigate the potential pandemic threat to the global food supply as it may become fungicide-insensitive. 13 April The direct imaging of HIP 99770 b, a new exoplanet found 133 light years away, is reported by astronomers. A global trend towards more rapid-onset "flash droughts" hindering forecasting is reported. 14 April Jupiter Icy Moons Explorer (JUICE) is launched by the European Space Agency (ESA) to search for life in the Jovian system, with an expected arrival date of 2031. 17 April A new technique for improving the resolution of post-mortem MRI brain scans "by 64 million times" is reported by researchers, who capture the sharpest ever images of an entire mouse brain. A study expands upon the international Earth heat inventory from 2020, which provides a measure of the Earth energy imbalance (EEI) and allows for quantifying how much and where heat has accumulated in the Earth system with comprehensive data. It suggests that the EEI is the "most fundamental global climate indicator" to gauge climate change mitigation efforts. 18 April Astronomers conclude that "...
Phenethylamine is a primary amine, the amino-group being attached to a benzene ring through a two-carbon, or ethyl group. It is a colourless liquid at room temperature that has a fishy odor, and is soluble in water, ethanol and ether. Its density is 0.964 g/ml and its boiling point is 195 °C. Upon exposure to air, it combines with carbon dioxide to form a solid carbonate salt. Phenethylamine is strongly basic, pKb = 4.17 (or pKa = 9.83), as measured using the HCl salt, and forms a stable crystalline hydrochloride salt with a melting point of 217 °C. Its experimental log P is 1.41.
The city and the metropolitan area has a dense transport network. This solves the problem of a break between the lower town and the upper town and the two parts of the city are connected by long boulevards, winding roads, many stairs, a funicular and the Jenner tunnel. The CODAH transport network is called Lia and is operated by the Ocean Port Transport company (CTPO), a subsidiary of Veolia Transport. The overhaul of the bus network in 2008 helped to ensure a better service for all the towns in the metropolitan area. The CTPO operates a bus network consisting of 19 regular urban routes and six evening routes called the "Midnight Bus". The Le Havre urban area is served by 165 vehicles and 41 regular bus routes with an average of 100,000 passengers per day. From January 2011 there has been a regular shuttle service specific to the Industrial Zone and Port of Le Havre, thus adding to the cross-estuary service of VTNI. Since 1890 the funicular has provided a link between the upper town and the lower town in four minutes with a cable car. Le Havre had a tramway system from 1894 until it closed in 1957. More recently a new tramway system, with 23 stations and 13 km (8 mi) of route, was built, and opened on 12 December 2012. The first part of the line connects the beach to the station climbing to the upper town through a new tunnel near the Jenner tunnel then it splits into two: one link going to Mont-Gaillard, the other to Caucriauville.
Apart from the cellular and molecular effects above, p53 has a tissue-level anticancer effect that works by inhibiting angiogenesis. As tumors grow they need to recruit new blood vessels to supply them, and p53 inhibits that by (i) interfering with regulators of tumor hypoxia that also affect angiogenesis, such as HIF1 and HIF2, (ii) inhibiting the production of angiogenic promoting factors, and (iii) directly increasing the production of angiogenesis inhibitors, such as arresten. p53 by regulating Leukemia Inhibitory Factor has been shown to facilitate implantation in the mouse and possibly human reproduction. The immune response to infection also involves p53 and NF-κB. Checkpoint control of the cell cycle and of apoptosis by p53 is inhibited by some infections such as Mycoplasma bacteria, raising the specter of oncogenic infection.
=== Water treatment === Scale deposition in boilers can reduce heat transfer efficiency and increase energy consumption. Antiscalants are added to boiler feedwater to prevent scale formation on heat transfer surfaces, piping, and other boiler components. Water treatment plants can use antiscalants to maintain filtration.
Sources: en.wikipedia.org
Department of Defense on human–animal bonding determined that there was an improvement and enrichment of life when animals were closely involved with humans. The study tested blood levels and noticed a rise in oxytocin in humans and animals which participated; oxytocin has the ability to lower stress, heart rate, and fear levels in humans and animals. Historically, animals were domesticated for functional use; for example, dogs for herding and tracking, and cats for killing mice or rats. Today, in Western societies, their function is primarily bonding. For example, current studies show that 60–80% of dogs sleep with their owners at night in the bedroom, either in or on the bed. Moreover, in the past the majority of cats were kept outside (barn cats) whereas today most cats are kept indoors (housecats) and considered part of the family. Currently, in the US, for example, 1.2 billion animals are kept as pets, primarily for bonding purposes. In addition, as of 1995, there were over 30 research institutions looking into the potential benefits of the human–animal bond.
=== Academic career === William H. Stein began his higher education as a chemistry major at Harvard University in 1929. He spent one year as a graduate student at Harvard University before transferring to the Department of Biological Chemistry at the College of Physicians and Surgeons, Columbia University, in 1934 to focus on biochemistry. Hans Thatcher Clarke, the chairman of the department at the time, was collecting many talented graduate students who would become the distinguished biochemists of the early twentieth century. In 1937, Stein completed his thesis on the amino acid composition of elastin, earning his Ph.D. Stein was introduced to potassium trioxalatochromate and ammonium rhodanilate by Max Bergmann, a Jewish-German biochemist who fled to the United States in 1934 under threat of Nazi occupation and worked in a laboratory at the Rockefeller Institute. He used these two precipitating agents to isolate the amino acids glycine and proline, respectively, for his research on elastin. With the conclusion of his academic career, Stein went on to work under Bergmann.
Cuprates have a structure close to that of a two-dimensional material. Their superconducting properties are determined by electrons moving within weakly coupled copper-oxide (CuO2) layers. Neighbouring layers contain ions such as lanthanum, barium, strontium, or other atoms that act to stabilize the structures and dope electrons or holes onto the copper-oxide layers. The undoped "parent" or "mother" compounds are Mott insulators with long-range antiferromagnetic order at sufficiently low temperatures. Single band models are generally considered to be enough to describe the electronic properties. The cuprate superconductors adopt a perovskite structure. The copper-oxide planes are checkerboard lattices with squares of O2− ions with a Cu2+ ion at the centre of each square. The unit cell is rotated by 45° from these squares. Chemical formulae of superconducting materials contain fractional numbers to describe the doping required for superconductivity. Several families of cuprate superconductors have been identified. They can be categorized by their elements and the number of adjacent copper-oxide layers in each superconducting block. For example, YBCO and BSCCO can be referred to as Y123 and Bi2201/Bi2212/Bi2223 depending on the number of layers in each superconducting block (n). The superconducting transition temperature peaks at an optimal doping value (p=0.16) and an optimal number of layers in each block, typically three. Possible mechanisms for cuprate superconductivity remain the subject of considerable debate and research.
Drostanolone propionate produces considerably less virilization in women compared to equal doses of testosterone propionate. However, since the given dosage for breast cancer was relatively high (200 mg/twice a week), mild virilization including oily skin, acne, voice deepening, hirsutism, and clitoral enlargement could still occur, and marked virilization could manifest with long-term therapy. The drug has no estrogenic activity and hence has no propensity for causing gynecomastia (in males) or fluid retention. Drostanolone propionate is not known to pose a risk of hepatotoxicity.
The DNA encoding a fusion of coat protein and protein of interest is often encoded on a phagemid - a plasmid containing both a bacterial origin of replication and phage attachment sequence. This allows it to be maintained and amplified in bacteria without producing phage virons. When bacterial colony reaches a desired size, a helper plasmid is transformed into the bacteria to supply them with the rest of the phage genome, enabling viron production. Alternatively, these phage genes can maintained within bacteria under inducible promoters, obviating the need for separate helper plasmid introduction.
Sources: en.wikipedia.org
Illustrated and well defined chemistry lab practical on ion exchange from Dartmouth College Some applets illustrating ion exchange processes A simple explanation of deionization Ion exchange, BioMineWiki Archived 2020-08-11 at the Wayback Machine
=== Role of chaperones === The autoprocessing of PIDD1 rate to induce the precise conformational state necessary for efficient self-cleavage. Hsp90 directly associates with full-length PIDD1 (FL-PIDD1), subsequently recruiting p23 to facilitate the stabilization and folding of PIDD1 into its active configuration. Hsp70, another key chaperone, binds not only to full-length PIDD1 (FL-PIDD1) but also to its cleavage fragments, PIDD-N and PIDD-C, although the specific role of this interaction is not yet fully understood. In addition to facilitating autoprocessing, Hsp90 plays a crucial role in maintaining PIDD1's stability and function, highlighting the importance of chaperones in controlling both PIDD1 self-cleavage and its overall protein levels. When Hsp90 is inhibited, PIDD1 undergoes rapid degradation through the E3 ubiquitin-protein ligase CHIP (also called STUB1), which appears to favor the ubiquitination of PIDD-C over PIDD-CC. CHIP directly interacts with both PIDD1 and Hsp70, suggesting that Hsp70 may also be involved in regulating PIDD1. Although the PIDDosome can form in vitro after temperature changes, and the dissociation of Hsp90 is required for this process, Hsp90s initial interaction is critical for PIDD1’s function. Interruption of the Hsp90-PIDD1 complex disrupts PIDD1 autoprocessing and its interactions with effector proteins.
== Publications == Ettre authored and co-authored close to 300 scientific publications, 20 books, editor and co-editor of 42 books. He was a member of many professional chemical societies. From 1968 to 1974 he served as the Executive Editor of the Encyclopedia of Industrial Chemical Analysis.
==== Paths and trails ==== Albany has many paths and trails open to both pedestrian and bicyclists. Simpson Park Trail is a dirt pedestrian trail with a round trip distance of 2.36 miles (3.80 km). The dirt trail starts at the parking lot of Simpson Park and continuing until the path ends in a grassy area with one very narrow path heading back toward the river. Periwinkle Creek Trail though is the longest of all the paved trails. It is a flat bicycle and pedestrian path that runs along Periwinkle Creek from the northwest corner of Grand Prairie Park to the Albany Boys and Girls Club, and travels a round trip distance of 3.61 miles (5.81 km). There are many other trails throughout the city to include, Cox Creek Loop and Waverly Lake Loop, Dave Clark Trail, Oak Creek Greenbelt Trail, Takena Landing Trail, Timber Linn Park Trails, and a proposed Swanson Park Connector a paved path on the north side of highway 99 that connects Swanson Park with the nearby Amtrak/Transit Center. Albany has made a growing effort to increase itself as a bicyclist friendly town through increasing the number of paths and trails that are open to them. The city was recently recognised as a Bicycle-Friendly Community for 2010 by the League of American Bicyclists for its efforts.
A clinical trial design in which neither the participating individuals nor the study staff knows which participants are receiving the experimental drug and which are receiving a placebo (or another therapy). Double-blind trials are thought to produce objective results, since the expectations of the doctor and the participant about the experimental drug do not affect the outcome; also called double-masked study. (NLM) A clinical trial in which neither the medical staff nor the person knows which of several possible therapies the person is receiving. (NCI) Double-dummy
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.
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.