circadian clock is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2026-08-01. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
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.
| 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 binds REV-ERB receptors and alters their repressive activity on target genes. This action can change transcription of genes involved in lipid handling, glucose metabolism, and mitochondrial function. In rodent studies, treated animals have shown changes in muscle oxidative capacity and exercise performance, though effects vary by dose, duration, and model. The precise molecular steps connecting receptor binding to whole-body outcomes are still an active area of investigation. Findings in animals do not automatically translate to humans.
Because REV-ERB receptors are core clock components, SR9009 has been examined for effects on daily rhythms as well as metabolism. Research has explored whether the compound can shift or reinforce circadian gene expression in tissues such as liver and muscle. Some studies report improved metabolic markers in obese or diabetic mice, while others show context-dependent responses. Questions remain about which effects are direct, which are secondary to timing, and how they might differ across species.
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.
When the university partially reopened, Cremer was still temporarily banned from work due to her German citizenship and would secretly visit the university in a delivery truck to continue research. Cremer was allowed to return to her work in late 1945. Prior completed the research demonstrating a novel method for measurements and qualitative and quantitative analysis in 1947. Another student of Cremer's, Roland Müller wrote his dissertation on the analytical possibilities of the gas chromatograph. Cremer was appointed director of the Physical Chemistry Institute at Innsbruck and was made a professor in 1951. Cremer began presenting Prior and Müller's work in 1947 at various scientific meetings. In 1951, three papers on Cremer's work were published in Zeitschrift für Elektrochemie, a lesser known German scientific journal. The scientific community responded to presentations and papers either negatively or not at all. Many believed that older methods were sufficient. In 1952, the British Anthony Trafford James and Archer Porter Martin and in 1953, the Czech J. Janak published reports claiming the invention of gas chromatography. Martin and his partner Richard Laurence Millington Synge won the Nobel Prize for partition chromatography, which is often credited for introducing the use of gas as a mobile phase, in 1952. All were completely ignorant of Cremer's early work. This has been attributed to the fact that Cremer spoke to the wrong people in the wrong places. Austrian analytical and micro chemists did not focus on gases, so the idea did not gain interest.
In 1990, a team of speleologists uncovered eight mummies, dating back to around 1283 AD, during a rescue excavation in the e 'Asi al-Hadath cave in the Qadisha Valley of Lebanon. The well-preserved spontaneous mummies, including an infant named dubbed Yasmine, offer insights into Maronite villagers' lives during the Mamluk era. The grotto's high altitude and dry conditions naturally mummified the bodies. The discovery provides historical context, aligning with documented Mamluk raids in the region. Artifacts, including pottery with inscriptions, manuscripts, and clothing, suggest a Maronite community, and the mummies' burial practices parallel present-day Lebanese customs. The remains were called "Maronite mummies" because the individuals found in the 'Asi-al Hadath cave were believed to be Maronites, an indigenous Christian community in the region. Some of the mummies have been transferred to the National Museum of Beirut.
As mayor, Newsom focused on development projects in Hunters Point and Treasure Island. He gained national attention in 2004 when he directed the San Francisco city–county clerk to issue marriage licenses to same-sex couples, violating a state law passed in 2000. Implementation of Care Not Cash, the initiative he had sponsored as a supervisor, began on July 1, 2004. As part of the initiative, 5,000 more homeless people were given permanent shelter in the city. About 2,000 people had been placed into permanent housing with support by 2007. Other programs Newsom initiated to end chronic homelessness included the San Francisco Homeless Outreach Team (SF HOT) and Project Homeless Connect (PHC), which placed 2,000 homeless people into permanent housing and provided 5,000 additional affordable rental units in the city. During a strike by hotel workers against a dozen San Francisco hotels, Newsom joined UNITE HERE union members on a picket line in front of the Westin St. Francis Hotel on October 27, 2004. He vowed that the city would boycott the hotels by not sponsoring city events at them until they agreed to a contract with workers; the contract dispute was settled in September 2006. In 2005, Newsom pushed for a state law to allow California communities to create policy restricting certain breeds of dogs. In 2007, he signed the law establishing Healthy San Francisco to provide city residents with universal health care, the first city in the nation to do so.
=== The Major Intrinsic Protein Family (TC# 1.A.8) === The MIP family is large and diverse, possessing thousands of members that form transmembrane channels. These channel proteins function in transporting water, small carbohydrates (e.g., glycerol), urea, NH3, CO2, H2O2 and ions by energy-independent mechanisms. For example, the glycerol channel, FPS1p of Saccharomyces cerevisiae mediates uptake of arsenite and antimonite. Ion permeability appears to occur through a pathway different than that used for water/glycerol transport and may involve a channel at the 4 subunit interface rather than the channels through the subunits. MIP family members are found ubiquitously in bacteria, archaea and eukaryotes. Phylogenetic clustering of the proteins is primarily based according to phylum of the organisms of origin, but one or more clusters are observed for each phylogenetic kingdom (plants, animals, yeast, bacteria and archaea). MIPs are classified into five subfamilies in higher plants, including plasma membrane (PIPs), tonoplast (TIPs), NOD26-like (NIPs), small basic (SIPs) and unclassified X (XIPs) intrinsic proteins. One of the plant clusters includes only tonoplast (TIP) proteins, while another includes plasma membrane (PIP) proteins.
=== Gaming Control Board === While secretary of revenue, Kennedy was also appointed to the Louisiana Gaming Control Board, which is responsible for regulating legalized gambling. He criticized riverboat casino operators for failing to enforce the 21-year age restriction.
Sources: en.wikipedia.org
=== Pharmacodynamics === Nalorphine acts at two opioid receptors — the μ-opioid receptor (MOR) where it has antagonistic effects, and at the κ-opioid receptor (KOR) (Ki = 1.6 nM; EC50 = 483 nM; Emax = 95%) where it exerts high-efficacy partial agonist/near-full agonist characteristics.
The United Nations Office on Drugs and Crime states, "While medical models of treatment for individuals with alcohol or opioid use disorders are well accepted and implemented worldwide, in most countries there is no parallel, long-term medical model of treatment for individuals with stimulant use disorders." The neglect of stimulant-users has been widely considered to be related to the popularity of stimulants among systemically-oppressed groups, such as methamphetamine use among gay men and transgender people, and crack cocaine use among Black people. The crack epidemic in the United States demonstrates a discrepancy between sentencing lengths of crack cocaine and heroin users, with crack users imprisoned for longer periods of time than heroin users. In 2012, 88% of imprisonments from crack cocaine were of African American people. Stimulant users have increasingly been at risk for opioid overdose since 2006, due to the nonconsensual presence of fentanyl in their substances.
==== Surfactins ==== As the name implies, surfactins are potent biosurfactants (surfactants produced by bacteria, yeast, or fungi), and they have been shown to reduce the surface tension of water from 72 to 27 mN/m at very low concentrations. Furthermore, surfactins are also able to permeabilize lipid membranes, allowing them to have specific antimicrobial and antiviral activities. Since surfactins are biosurfactants, they have diverse functional properties. These include low toxicity, biodegradability and a higher tolerance towards variation of temperature and pH, making them very interesting for use in a wide range of applications.
The dynamic behavior of Min proteins has been reconstituted in vitro using artificial lipid bilayers, with varying lipid composition and different confinement geometry as mimics for the cell membrane. The first pattern to be reconstituted were spiraling waves of MinD chased by MinE, followed by the reconstitution of waves of all three proteins, MinD, MinE and MinC. Importantly, MinD and MinE can self-organize into a wide variety of patterns depending on the reaction conditions. Additional study is required to elucidate the extent of temporal and spatial signaling permissible by this biological function. These in vitro systems offered unprecedented access to features such as residence times and molecular motility.
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.
Liquid chromatography with mass spectrometry is a common approach. Ultraviolet detection and nuclear magnetic resonance can support identification when suitable standards are available.