NR1D1 raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2025-10-04 and is reviewed periodically as new material appears.
Analytical methods for SR9009 typically rely on liquid chromatography coupled with tandem mass spectrometry. The technique can separate the parent compound from related substances and detect low concentrations in biological matrices. Urine and blood are common samples in anti-doping testing, while in vitro studies may use cell culture media. Rapid metabolism and low expected concentrations make method validation important for reliable identification. Exact metabolite patterns can vary by species and are not fully mapped.
Regulatory treatment of SR9009 reflects its investigational status. The compound has no approved human therapeutic indication, and sports authorities prohibit its use. It appears on anti-doping lists as a non-approved substance or metabolic modulator, depending on the list version. Products sold online as research chemicals are not quality-controlled medicines, so their identity and purity can differ from the label. Such products may also contain unlisted compounds, which complicates both testing and safety assessment.
Laboratory samples of SR9009 are typically handled as research chemicals rather than pharmaceuticals. Suppliers usually state that the material is for research use only and not for human or veterinary administration. Storage recommendations generally call for a freezer at approximately −20 °C, protection from light, and a desiccated environment. The solid is often described as a white to off-white powder. Solubility is commonly reported in organic solvents such as dimethyl sulfoxide and ethanol, with low solubility in water.
Analytical identification and purity assessment often use high-performance liquid chromatography with ultraviolet detection or mass spectrometry. Liquid chromatography–tandem mass spectrometry is used to detect and quantify SR9009 in biological matrices, including urine and blood, for anti-doping or pharmacokinetic studies. Nuclear magnetic resonance spectroscopy can confirm molecular structure. Stability depends on form and storage: the solid is generally more stable than solutions, and repeated freeze–thaw cycles may degrade samples. Purity is typically reported as a percentage from a certificate of analysis.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Not approved for human use | Investigational status in most countries |
| Sports status | Prohibited by WADA | Classified as non-approved or metabolic modulator |
| Common analytical method | LC-MS/MS | Used for trace detection in biological samples |
| Typical test matrices | Urine and blood | Sample choice depends on testing program |
| Human trial data | None published | Effects and safety are not established |
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.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ, also called NR1D1 and NR1D2. These receptors help regulate circadian rhythms and metabolic gene programs. The compound was developed for laboratory research, not as an approved therapeutic. Its identity is distinct from steroid hormones and selective androgen receptor modulators. Scientific interest centers on how REV-ERB activation changes gene expression in cells and animal models.
At the molecular level, SR9009 binds the ligand-binding domain of REV-ERB and strengthens recruitment of corepressor proteins such as NCoR and HDAC3. This increases repression of target genes, including Bmal1 and other clock-controlled and metabolic genes. In rodent studies, such changes have been linked to altered lipid handling, glucose metabolism, and energy expenditure. The precise chain of events between receptor binding and whole-body effects remains an active area of research. Findings in animals do not automatically translate to humans.
Laboratory studies often administer SR9009 by injection because oral absorption appears poor in rodents. Reported pharmacokinetic properties include rapid metabolism and low systemic exposure after oral dosing. Human pharmacokinetic data are sparse, so absorption, distribution, metabolism, and excretion in people are not well defined. Some research explores related REV-ERB compounds with improved drug-like properties. Regulatory approval for any REV-ERB agonist as a human medicine has not been granted to date.
synonymous mutation Also synonymous substitution or samesense mutation. A type of mutation in which the substitution of one nucleotide base for another results, after transcription and translation, in an amino acid sequence which is identical to the original unmutated sequence. This is possible because of the degeneracy of the genetic code, which allows different codons to code for the same amino acid. Though synonymous mutations are often considered silent, this is not always the case; a synonymous mutation may affect the efficiency or accuracy of transcription, splicing, translation, or any other process by which genes are expressed, and thus become effectively non-silent. Contrast nonsynonymous mutation.
By 1945 she had succeeded in identifying the structure of vitamin B12, describing the arrangement of its atoms in three dimensions. In 1947, she was elected a Fellow of the Royal Society (FRS) In 1958, she was elected a Foreign Honorary Member of the American Academy of Arts and Sciences. Hodgkin won the 1964 Nobel Prize in Chemistry, and is the only British woman scientist to have been awarded a Nobel Prize in any of the three sciences it recognizes. In 1965 she was appointed to the Order of Merit. She was the second woman to receive the Order. In 1966, she was awarded the Iota Sigma Pi National Honorary Member for her significant contribution. In 1970, gained EMBO Membership. She became a foreign member of the USSR Academy of Sciences in the 1970s. In 1976, she was the first woman to receive the prestigious Copley Medal. Hodgkin was Chancellor of the University of Bristol from 1970 to 1988. In 1978, she was given an honorary Degree of Science from University of Bath. In 1981, she was awarded the Dalton Medal from the Manchester Literary and Philosophical Society In 1982 she received the Lomonosov Medal of the Soviet Academy of Sciences. In 1987 she accepted the Lenin Peace Prize from the government of Mikhail Gorbachev. In 1983, Hodgkin received the Austrian Decoration for Science and Art. In 1993, an asteroid (5422) discovered on 23 December 1982 by L.G. Karachkina (at the Crimean Astrophysical Observatory, M.P.C. 22509, in the USSR) was named "Hodgkin" in her honour.
This enzyme is an oxidoreductase, oxidizing the CH-OH alcohol group to a carbonyl group. NAD+ is the oxidizing agent, yielding reduced NADH. Aryllactates and arylpyruvates are intermediates in tyrosine, phenylalanine and tryptophan metabolism and blood serum levels of these compounds affect intestinal permeability and systemic immunity in mice. Alternative names for these enzymes are: (R)-aromatic lactate dehydrogenase, D-aryllactate D-hydrogenase, (indol-3-yl)lactate:NAD+ oxidoreductase, indolelactate:NAD+ oxidoreductase, (R)-4-hydroxyphenyllactate dehydrogenase, (R)-3-(4-hydroxyphenyl)lactate:NAD(P)+ 2-oxidoreductase
Sources: en.wikipedia.org
== Sources == Isotope masses from: National Nuclear Data Center. "NuDat 3.0 database". Brookhaven National Laboratory. Half-life, spin, and isomer data selected from the following sources. National Nuclear Data Center. "NuDat 3.0 database". Brookhaven National Laboratory. IAEA - Nuclear Data Section. Live Chart of Nuclides. Vienna International Centre. Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.). CRC Handbook of Chemistry and Physics (85th ed.). Boca Raton, Florida: CRC Press. ISBN 978-0-8493-0485-9.
18 Poems, The Sunday Referee; Parton Bookshop, 1934 Portrait of the Artist as a Young Dog, London: Dent, 1940 Deaths and Entrances, London: Dent, 1946 A Child's Christmas in Wales, New Directions, 1955 The Collected Poems of Dylan Thomas: The New Centenary Edition. Ed. with Introduction and annotations by John Goodby. London: Weidenfeld & Nicolson, 2014 The Notebook Poems 1930–34, ed. Ralph Maud. London: Dent, 1989 Dylan Thomas: The Broadcasts, ed. Ralph Maud. London: Dent, 1991 Dylan Thomas: The Filmscripts, ed. John Ackerman. London: Dent, 1995 Dylan Thomas: Early Prose Writings, ed. Walford Davies. London: Dent, 1971 Collected Stories, ed. Walford Davies. London: Dent, 1983 Under Milk Wood: A Play for Voices, ed. Walford Davies and Ralph Maud. London: Dent, 1995 On the Air with Dylan Thomas: The Broadcasts, ed. R. Maud. New York: New Directions, 1991
(2026) report the discovery of a new site (Emiliano Aguirre Korongo) at Olduvai Gorge (Tanzania) preserving proboscidean remains with bone modifications interpreted as the authors as evidence of butchery assisted by stone tools, and interpret the fossil record of megafaunal bone modifications at Olduvai Gorge as consistent with more frequent and widespread megafaunal butchery after 1.8 million years ago, roughly coinciding with the replacement of Oldowan industries by Acheulean ones. Evidence from the study of burnt bones of small mammals from the Acheulean deposits from the Wonderwerk Cave (South Africa), indicative of repeated use of fire by Early Pleistocene hominins, is presented by Marin-Monfort et al. (2026). Evidence from the study of an approximately 1.6 million years old assemblage of associated hominin fossils and butchered fauna from the KBS Member of the Koobi Fora Formation, indicative of consistent foraging strategies of early Homo across time and in different environments, is presented by Forrest et al. (2026). Campo-Gómez et al. (2026) determine prey carrying capacity and total biomass of the Early Pleistocene large mammal community available to hominins from the Sima del Elefante site (Spain), interpreted as capable of sustaining hominin groups of low density. Wang et al. (2026) study the morphology of lumbar vertebrae of immature individuals of Homo erectus and Australopithecus sediba from Georgia, Kenya and South Africa, reporting evidence of establishment of vertebral traits related to bipedal locomotion early in hominin ontogeny and evolution.
== Terminology == Eras cannot easily be defined for periodization, the process of categorizing the past into quantified, named blocks of time for the purpose of analysis. 1500 is an approximate starting period for the modern era because many major events caused the Western world to change around then: from the fall of Constantinople (1453), Gutenberg's moveable type printing press (1450s), and Christopher Columbus's voyage to the Americas (1492), to the Reformation begun with Martin Luther's Ninety-five Theses (1517). The term "modern" was coined shortly before 1585 to describe the beginning of a new era. It was long thought that the term "early modern" was invented either in the 1930s, to distinguish the time between the Middle Ages and late Enlightenment (1800), or the mid-20th century, and only gained traction in the 1960s. Justus Nipperdey pointed to its widespread usage by American historians around 1900 already, adding: 'In the interwar years the term permeated all areas of professional activity from textbooks and graduate school seminars to conferences, research articles, and job descriptions.' The difference between "early modern" and "modern" was defined by the French Revolution and Industrial Revolution. The European Renaissance (14th–16th centuries), which started in Italy, is an important transition period beginning in the Late Middle Ages and marking the change into early modern history.
Sources: en.wikipedia.org
Rarely, direct damage to the hypothalamus, such as from a stroke, will cause a fever; this is sometimes called a hypothalamic fever. However, it is more common for such damage to cause abnormally low body temperatures.
Ceftriaxone and other third-generation cephalosporin antibiotics are used to treat organisms that tend to be resistant to many other antibiotics. Due to emergent resistance, ceftriaxone should not be used for the treatment of Enterobacter infections. Before using ceftriaxone, it is important to determine the susceptibility of the bacteria. If sepsis is being considered, empiric therapy may be initiated prior to susceptibility testing. Medical uses include:
Synapse and dendritic spine growth may be disrupted in autism due to impaired neurexin–neuroligin cell-adhesion signaling or dysregulated synthesis of synaptic proteins. Disrupted synaptic development may also contribute to epilepsy, which may explain why the two conditions are associated. Studies have shown that imbalances between excitation and inhibition (EI) in brain circuitry is the primary cause of synaptic dysfunction in autism. Major Histocompatibility Class I (MHCI) antigens and inflammatory cytokines may be responsible for regulating the EI balance by impacting synapse development and plasticity. Neurotransmitters such as serotonin, dopamine, and glutamate have been implicated in autism. The dysregulation of neurotransmitters and neuropeptides can contribute to pathophysiology and symptoms of autism. Fragile X, the most common genetic cause of autism, is linked to dysfunction of group I metabotropic glutamate receptors (mGluR), leading some to consider their potential role in autism.
Sources: en.wikipedia.org
No. It is an investigational compound without approved therapeutic indications. It is sold for research purposes only in many jurisdictions.
Sports authorities prohibit it because it is not approved for human use and has potential performance-enhancing effects. It appears on anti-doping lists under non-approved or metabolic modulator categories.
Detection usually uses liquid chromatography-tandem mass spectrometry. The method targets the parent compound or its metabolites in urine or blood.
Legality depends on the country and the intended use. In many places it is sold as a research chemical, but sports and medicine regulations restrict it.