A practical reference on reference standard: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-08-01. Anything still debated is marked as such rather than presented as settled.
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.
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 |
|---|---|---|
| Typical storage temperature | -20 °C or lower | Desiccated and protected from light |
| Common analytical method | LC-MS/MS | Detects parent drug and metabolites |
| Solubility class | Lipophilic; soluble in organic solvents | Low aqueous solubility |
| Molecular weight | 437.94 g/mol | Calculated from reported formula |
| Synonyms | SR9009; REV-ERB agonist | Code name used in scientific literature |
SR9009 is frequently discussed alongside other REV-ERB ligands, including synthetic agonists and natural heme-related molecules. Its selectivity for REV-ERB over related nuclear receptors has been measured in binding and reporter assays, though off-target activity at higher concentrations is possible. The compound is prohibited in sport by the World Anti-Doping Agency, and it is not approved for any medical use in major jurisdictions. Products sold online may be labeled as research chemicals, and their identity and purity are not guaranteed by regulatory review.
SR9009 is a synthetic small molecule that acts on the nuclear receptors REV-ERBα and REV-ERBβ. These receptors are part of the circadian clock machinery and normally repress transcription of certain target genes. In laboratory research, SR9009 is used as a chemical tool to study how REV-ERB activity influences metabolism, inflammation, and daily biological rhythms. The compound is not an approved medicine, and its effects in humans remain largely uncharacterized. It is often described as an investigational agent rather than a therapeutic product.
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.
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.
MetaPred: A webserver for the prediction of cytochrome P450 isoforms responsible for metabolizing a drug molecule. The MetaPred server predicts metabolizing CYP isoforms of a drug molecule/substrate based on SVM models developed using CDK descriptors. This server is intended to help researchers working in the field of drug discovery. The effort also demonstrates that it is possible to develop free web servers in the field of cheminformatics. This may encourage other researchers to develop web servers for public use, leading to decreased cost of discovering new drug molecules. ToxiPred: A server for prediction of aqueous toxicity of small chemical molecules in T. pyriformis. KetoDrug: A user friendly web server for binding affinity prediction of ketoxazole derivatives and small chemical molecules against Fatty Acid Amide Hydrolase (FAAH). KiDoQ: A web server to serve researchers working in the field of designing inhibitors against dihydrodipicolinate synthase (DHDPS), a potential drug target enzyme of a unique bacterial DAP/Lysine pathway. GDoQ: GDoQ (Prediction of GLMU inhibitors using QSAR and AutoDock) is an open source platform for predicting inhibitors against Mycobacterium tuberculosis (M.Tb) drug target N-acetylglucosamine-1-phosphate uridyltransferase (GLMU) protein. This is a potential drug target involved in bacterial cell wall synthesis. This server uses molecular docking and QSAR strategies to predict inhibitory activity value (IC50) of chemical compounds for GLMU protein. ROCR: The ROCR is an R package for evaluating and visualizing classifier performance.
=== Excretion === Most molybdenum is excreted from the human body as molybdate in the urine. Furthermore, urinary excretion of molybdenum increases as dietary molybdenum intake increases. Small amounts of molybdenum are excreted from the body in the feces by way of the bile; small amounts also can be lost in sweat and in hair.
=== Political organizations === Alianza Americana Anticomunista ("American Anticommunist Alliance" in Spanish), a Colombian para-military organization, 1978–1979 Alianza Apostólica Anticomunista, in Spain Anti-Austerity Alliance, a political party in Ireland Argentine Anticommunist Alliance, a mid-1970s death squad
=== Filming === Every exterior (outdoor) scene was filmed in Zimbabwe, as were roughly 70% of interior shots. The remaining interior shots were all filmed in England. Principal filming took place primarily in Harare in Zimbabwe because of the tense political situation in South Africa at the time of shooting. The film includes a dramatised depiction of the Soweto uprising and massacre, which occurred on 16 June 1976. Indiscriminate firing by police killed and injured hundreds of black South African schoolchildren during a mostly peaceful protest march.
== Function == BMPs interact with specific receptors on the cell surface, referred to as bone morphogenetic protein receptors (BMPRs). Signal transduction through BMPRs results in mobilization of members of the SMAD family of proteins. The signaling pathways involving BMPs, BMPRs and SMADs are important in the development of the heart, central nervous system, and cartilage, as well as post-natal bone development. They have an important role during embryonic development on the embryonic patterning and early skeletal formation. As such, disruption of BMP signaling can affect the body plan of the developing embryo. For example, BMP4 and its inhibitors noggin and chordin help regulate polarity of the embryo (i.e. back to front patterning). Specifically BMP-4 and its inhibitors play a major role in neurulation and the development of the neural plate. BMP-4 signals ectoderm cells to develop into skin cells, but the secretion of inhibitors by the underlying mesoderm blocks the action of BMP-4 to allow the ectoderm to continue on its normal course of neural cell development. Additionally, secretion of BMPs by the roof plate in the developing spinal cord helps to specify dorsal sensory interneurons. As a member of the transforming growth factor-beta superfamily, BMP signaling regulates a variety of embryonic patterning during fetal and embryonic development. For example, BMP signaling controls the early formation of the Müllerian duct (MD) which is a tubular structure in early embryonic developmental stage and eventually becomes female reproductive tracts.
Sources: en.wikipedia.org
10 Ca(OH)2 + 6 H3PO4 → Ca10(PO4)6(OH)2 + 18 H2O The ability to synthetically replicate hydroxyapatite has invaluable clinical implications, especially in dentistry. Each technique yields hydroxyapatite crystals of varied characteristics, such as size and shape. These variations have a marked effect on the biological and mechanical properties of the compound, and therefore these hydroxyapatite products have different clinical uses.
=== 2004 === 24 June Human Face Transplant, an Equinox Special, about Jacqui Saburido, after a drunk driver hit her car, work takes place at the University of Louisville School of Medicine; featured the work of John Barker in Kentucky, and his colleague Joe Banis; the French plastic surgeon Laurent Lantieri. Narrated by Lucy Briers, directed by Iain Scollay
=== Cancer treatment === Pardaxin inhibits proliferation and induces apoptosis of human cancer cell lines. Its 33-amino acid structure contains many cationic and amphipathic amino acids. This makes it easier for it to interact with anionic membranes, such as those in tumor cells, which are inherently more acidic because of the acidic environment created by more glycolysis. Pardaxin initiates caspase-dependent and caspase-independent apoptosis in human cervical carcinoma cells. Pardaxin triggers reactive oxygen species (ROS). ROS production disrupts protein folding and induces the unfolded protein response (UPR). This causes stress on the endoplasmic reticulum, which releases calcium. This leads to an increase in mitochondrial calcium, dropping its membrane potential. The pore permeability changes, and Cytochrome c (Cyt c) is released. Cyt c activates the caspase chain that leads to apoptosis. ROS also activates the JNK pathway. JNK is phosphorylated, which leads to the phosphorylation of AP-1 (transcription factor consisting of cFOS and Cjun). This results in the activation of caspases as well. ROS also causes a caspase independent pathway that results in apoptosis. When the mitochondrial membrane potential changes, apoptosis-inducing factors (AIFs) are also released. These trigger apoptosis when they enter the nucleus, not needing to involve caspases.
== Effectiveness == Silicone gel sheeting has remained the first-line therapy stated by international clinical recommendations on scar management. Scar measurements studied in most clinical trials include color (vascularisation and pigmentation), thickness (height: clinical and histological), relief (surface irregularities), pliability (tissue elasticity), and surface area (scar contraction or expansion). Scar elevation index is commonly used to indicate scar improvement. It measures the height of scar tissue compared to the normal surrounding skin. Studies show the effectiveness of silicone gel sheeting in minimizing scar elevation index. Another physical measure is the pliability of the scar tissue, which is also improved by silicone gel sheeting. Scar improvement is generally measured by size reduction, appearance, and calming effect. Silicone gel sheeting addresses the 3 requirements well among scar treatments. Several randomized controlled trials were carried out to assess the effectiveness. Silicone gel sheeting produces a statistically significant reduction in scar thickness and color amelioration. Therefore, it is an evidence-based non-invasive preventive treatment. Results of comparative studies on the effectiveness of silicone gel sheeting and silicone gel do not show significant differences between the two. Another non-invasive treatment is compression therapy, in which patients wear pressure garments to control the growth of scars. Pressure garments apply mechanical pressure to the surface of the scar, reducing the supply of blood and oxygen to the scar tissue.
A tooth from what is now documented as a Tyrannosaurus rex was found in July 1874 upon South Table Mountain (Colorado) by Jarvis Hall student Peter T. Dotson under the auspices of Arthur Lakes near Golden, Colorado, in sediments belonging to the Denver Formation. In the early 1890s, John Bell Hatcher collected postcranial elements in eastern Wyoming. The fossils were believed to be from the large species Ornithomimus grandis (now Deinodon) but are now considered T. rex remains. In 1892, Edward Drinker Cope found two vertebral fragments of a large dinosaur. Cope believed the fragments belonged to an "agathaumid" (ceratopsid) dinosaur, and named them Manospondylus gigas, meaning "giant porous vertebra", in reference to the numerous openings for blood vessels he found in the bone. The M. gigas remains were, in 1907, identified by Hatcher as those of a theropod rather than a ceratopsid. Henry Fairfield Osborn recognized the similarity between Manospondylus gigas and T. rex as early as 1917, by which time the second vertebra had been lost. Owing to the fragmentary nature of the Manospondylus vertebrae, Osborn did not synonymize the two genera, instead considering the older genus indeterminate. In June 2000, the Black Hills Institute found around 10% of a Tyrannosaurus skeleton (BHI 6248) at a site that might have been the original M. gigas locality. While Larson initially considered this specimen as the same animal as the M. gigas holotype and suggested that it would take priority over T. rex, other researchers including Christopher Brochu remained skeptical that the name T.
Sources: en.wikipedia.org
Bone fractures occur because the stress state within collagen fibrils is altered at the locations of mutations, where locally larger shear forces lead to rapid failure of fibrils even at moderate loads because the homogeneous stress state normally found in healthy collagen fibrils is lost. OI is therefore a multi-scale phenomenon, where defects at the smallest levels of tissues (genetic, nano, micro) domino to affect the macro level of tissues.
All other potassium isotopes have half-lives under a day, most under a minute. The unbound 31K was discovered in 2019 and emits three protons; its half-life was measured to be shorter than 10 picoseconds. Stable potassium isotopes have been used for several nutrient cycling studies since potassium is a macronutrient required for life.
Dalbavancin, sold under the brand names Dalvance in the US and Xydalba in the EU (both by AbbVie) among others, is a second-generation lipoglycopeptide antibiotic medication. It belongs to the same class as vancomycin, the most widely used and one of the treatments available to people infected with methicillin-resistant Staphylococcus aureus (MRSA). Dalbavancin is a semisynthetic lipoglycopeptide that was designed to improve upon the natural glycopeptides vancomycin and teicoplanin. It is derived from a complex of glycopeptide antibiotics, referred to as A-40926, that is produced by a new strain of Actinomadura. Dalbavancin has been referred to in the scientific literature by a series of names: MDL-63397, A-!-1, BI-397, VER-001. These different labels reflected where the research had been carried out: MDL representing Merrell-Dow-Lepetit, where the initial complex was discovered; BI referring to BioSearch Italia where Dalbavancin itself was first synthesized; VER referring to Versicor (which Biosearch Italia merged with to create Vicuron Pharmaceuticals). The phase I, II and III clinical trials were carried out of by Vicuron and the initial NDA filed. Vicuron was acquired by Pfizer in 2005, which decided to not further develop Dalbavancin at that time, subsequently selling the rights to Durata Therapeutics in 2009. It possesses in vitro activity against a variety of Gram-positive pathogens including MRSA and methicillin-resistant Staphylococcus epidermidis (MRSE).
The propionyl-CoA is later converted into succinyl-CoA through biotin-dependant propionyl-CoA carboxylase (PCC) and Vitamin B12-dependant methylmalonyl-CoA mutase (MCM), sequentially. Succinyl-CoA is first converted to malate, and then to pyruvate where it is then transported to the matrix to enter the citric acid cycle. In the liver oxaloacetate can be wholly or partially diverted into the gluconeogenic pathway during fasting, starvation, a low carbohydrate diet, prolonged strenuous exercise, and in uncontrolled type 1 diabetes mellitus. Under these circumstances, oxaloacetate is hydrogenated to malate, which is then removed from the mitochondria of the liver cells to be converted into glucose in the cytoplasm of the liver cells, from where it is released into the blood. In the liver, therefore, oxaloacetate is unavailable for condensation with acetyl-CoA when significant gluconeogenesis has been stimulated by low (or absent) insulin and high glucagon concentrations in the blood. Under these conditions, acetyl-CoA is diverted to the formation of acetoacetate and beta-hydroxybutyrate. Acetoacetate, beta-hydroxybutyrate, and their spontaneous breakdown product, acetone, are frequently, but confusingly, known as ketone bodies (as they are not "bodies" at all, but water-soluble chemical substances). The ketones are released by the liver into the blood.
The above table reflects the hybrid nature of metalloids. The properties of form, appearance, and behaviour when mixed with metals are more like metals. Elasticity and general chemical behaviour are more like nonmetals. Electrical conductivity, band structure, ionization energy, electronegativity, and oxides are intermediate between the two.
Sources: en.wikipedia.org
Liquid chromatography-tandem mass spectrometry is a common approach. It can detect the parent compound and its metabolites in biological matrices.
Research samples are typically kept frozen, desiccated, and protected from light. Stock solutions are often aliquoted to reduce freeze-thaw cycles.
High-performance liquid chromatography and nuclear magnetic resonance are standard for purity and identity. Mass spectrometry confirms molecular weight.
Liquid chromatography with mass spectrometry is a common approach. Ultraviolet detection and nuclear magnetic resonance can support identification when suitable standards are available.