A practical reference on LC-MS/MS: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-07-03. Anything still debated is marked as such rather than presented as settled.
In rodent studies, SR9009 has been reported to increase mitochondrial content in skeletal muscle and improve exercise endurance under some conditions. These findings led to popular descriptions such as an exercise mimetic, although that term oversimplifies the biology. Effects vary by dose, timing, tissue, and model. The compound's influence on circadian pathways means that time of administration can matter in experiments. Whether similar metabolic changes occur in humans remains largely unexplored in controlled published trials.
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 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 |
|---|---|---|
| Chemical class | Synthetic small-molecule REV-ERB agonist | Not a hormone or natural product |
| Primary targets | REV-ERBα and REV-ERBβ | Nuclear receptors involved in circadian and metabolic regulation |
| Appearance | White to off-white solid | Typical for purified research samples |
| Solubility | Soluble in DMSO and ethanol; low water solubility | Laboratory solubility depends on solvent and purity |
| Common synonyms | SR9009; Stenabolic | Stenabolic is a colloquial name, not a formal chemical name |
Preclinical reports have linked SR9009 to improved endurance and altered energy expenditure in rodents. Such findings have prompted interest in whether REV-ERB activation can influence skeletal muscle metabolism. However, the reported effects depend on dose, route, and experimental model, and replication across laboratories is limited. Human trials have not established comparable outcomes, so claims about exercise performance remain speculative. The absence of controlled human data is a central limitation in interpreting these observations.
The mechanism of action involves binding to REV-ERB receptors and recruiting corepressor complexes, which represses target gene transcription. This contrasts with many nuclear receptor agonists that activate transcription. Downstream effects may include changes in autophagy, mitochondrial biogenesis, and lipid handling, but the precise pathways remain an active area of study. Whether these molecular events translate into meaningful physiological effects in humans is unresolved. Most evidence comes from cultured cells and rodent models rather than human participants.
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.
Stability depends on physical form, temperature, light exposure, and solvent. Solid SR9009 is generally stored cold and dry, with protection from light to limit degradation. Dimethyl sulfoxide stocks are common for laboratory work, but repeated freeze-thaw cycles can reduce compound integrity. Aqueous solutions may be less stable than organic stocks, and the ethyl ester in the structure can be susceptible to hydrolysis under certain conditions. Researchers typically validate storage conditions and recheck purity before quantitative experiments, especially when using archived material.
Regulatory treatment of SR9009 varies by country and region. It is not approved as a pharmaceutical, and several jurisdictions restrict its sale for human consumption. Some authorities classify it as a research chemical, a prescription-only substance, or a prohibited performance-enhancing agent in sport. Purchasers may encounter certificates of analysis, but these documents do not guarantee identity, purity, or legality. In research settings, institutional safety reviews and controlled procurement help ensure that materials are handled under appropriate oversight. The absence of harmonized rules means that legal status can change and requires verification.
== Mosher's method == Mosher's acid, via its acid chloride derivative, reacts readily with alcohols and amines to give esters and amides, respectively. The lack of an alpha-proton on the acid prevents loss of stereochemical fidelity under the reaction conditions. Thus, using an enantiomerically pure Mosher's acid allows for determination of the configuration of simple chiral amines and alcohols. For example, the (R)- and (S)-enantiomers of 1-phenylethanol react with (S)-Mosher acid chloride to yield (R,S)- and (S,S)-diastereomers, respectively, that are distinguishable in NMR.
Arthrospira species are free-floating, filamentous cyanobacteria characterized by cylindrical, multicellular trichomes in an open left-handed helix. They occur naturally in tropical and subtropical lakes with high pH and high concentrations of carbonate and bicarbonate. A. platensis occurs in Africa, Asia, and South America, whereas A. maxima is confined to Central America. Most cultivated spirulina is produced in open-channel raceway ponds, with paddle wheels used to agitate the water. Spirulina thrives at a pH around 8.5 and above and a temperature around 30 °C (86 °F). They are autotrophic, and do not need a living energy or organic carbon source.
In the United States, the term "nickel" or "nick" originally applied to the copper-nickel Flying Eagle cent, which replaced copper with 12% nickel 1857–58, then the Indian Head cent of the same alloy from 1859 to 1864. Still later, in 1865, the term designated the three-cent nickel, with nickel increased to 25%. In 1866, the five-cent shield nickel (25% nickel, 75% copper) appropriated the designation, which has been used ever since for the subsequent 5-cent pieces. This alloy proportion is not ferromagnetic. The US nickel coin contains 0.04 ounces (1.1 g) of nickel, which at the April 2007 price was worth 6.5 cents, along with 3.75 grams of copper worth about 3 cents, with a total metal value of more than 9 cents. Since the face value of a nickel is 5 cents, this made it an attractive target for melting by people wanting to sell the metals at a profit. The United States Mint, anticipating this practice, implemented new interim rules on December 14, 2006, subject to public comment for 30 days, which criminalized the melting and export of cents and nickels. Violators can be punished with a fine of up to $10,000 and/or a maximum of five years in prison. As of February 19, 2025, the melt value of a US nickel (copper and nickel included) is $0.054 (108% of the face value).
Lightbearer: The second DLC story that follows Wellington Wells' local rock superstar, Nick Lightbearer (whose real name is Norbert Pickles). In this DLC, Nick does not use weapons to fend off his crazed fans; instead, Nick dispatches them by playing music on his electric guitar. Since there is no map available to guide him, he plays his guitar in front of the gilded full-body statues molded in his likeness to indicate his current destination. During a fan convention, Nick wakes one morning in his hotel room hallucinating a talking rat with the voice of his ex-agent Virgil. Nick's clothes are soaked in blood and he is unable to recall the events that led to his situation. Nick follows Virgil's advice and flees the hotel, returning to his old home which has been converted into a museum. After having a hallucinated battle with his ex-wife Petunia, Nick is instructed by Virgil to try and remember the events of last night. Nick realizes he wrote down a record of events in the form of lyrics, and plays them to his music to try and jog his memory. After experiencing a disturbing dream showing the real Virgil being murdered, Nick wakes up back in his hotel room as if nothing happened. He then heads down to the bar to try and make sense of everything, when he runs into Morrie Memento, a pianist he had fired from his band. Nick finds one of Morrie's songs familiar, and recovers his piano tuner in order to hear the full version.
Hemoglobin C/ beta thalassemia: common in Mediterranean and African populations generally results in a moderate form of anemia with splenomegaly. Hemoglobin D/ beta thalassemia: common in the northwestern parts of India and Pakistan (Punjab region). Hemoglobin E/ beta thalassemia: common in Cambodia, Thailand, and parts of India, it is clinically similar to β thalassemia major or β thalassemia intermedia. Hemoglobin S/ beta thalassemia: common in African and Mediterranean populations, it is clinically similar to sickle-cell anemia. Delta-beta thalassemia is a rare form of thalassemia in which there is a reduced production of both the delta and beta globins. It is generally asymptomatic.
Sources: en.wikipedia.org
=== Gluconeogenesis === Gluconeogenesis (GNG) is a metabolic pathway that results in the generation of glucose from certain non-carbohydrate carbon substrates. It is a ubiquitous process, present in plants, animals, fungi, bacteria, and other microorganisms. In vertebrates, gluconeogenesis occurs mainly in the liver and, to a lesser extent, in the cortex of the kidneys. It is one of two primary mechanisms – the other being degradation of glycogen (glycogenolysis) – used by humans and many other animals to maintain blood sugar levels, avoiding low levels (hypoglycemia). In ruminants, because dietary carbohydrates tend to be metabolized by rumen organisms, gluconeogenesis occurs regardless of fasting, low-carbohydrate diets, exercise, etc. In many other animals, the process occurs during periods of fasting, starvation, low-carbohydrate diets, or intense exercise. In humans, substrates for gluconeogenesis may come from any non-carbohydrate sources that can be converted to pyruvate or intermediates of glycolysis (see figure). For the breakdown of proteins, these substrates include glucogenic amino acids (although not ketogenic amino acids); from breakdown of lipids (such as triglycerides), they include glycerol, odd-chain fatty acids (although not even-chain fatty acids, see below); and from other parts of metabolism they include lactate from the Cori cycle. Under conditions of prolonged fasting, acetone derived from ketone bodies can also serve as a substrate, providing a pathway from fatty acids to glucose.
Following Brüning's resignation, the Centre Party entered the opposition. Though they also opposed the Nazi Party, their energies were directed mainly against the renegade Papen. Some Centre politicians were soothed by Hitler's strategy of legality into downplaying the Nazi threat. In regard to the government, the Centre Party rejected a "temporal solution", such as Papen's presidial cabinets, and rather advocated a "total solution", i.e., a government according to the rules of the constitution. Since the Centre considered Papen's administration of being "in a dangerous way dependent on radical right-wing parties", chairman Ludwig Kaas advised the President to recognise this connection by basing the government on a coalition with the rising right-wing parties, the "logical result of current development". This would force the radicals to "take their share in responsibility" and "acquainting them with international politics". The Centre would then act as the party of opposition to this administration. As Papen was faced with almost uniform opposition by the parties, he had the Reichstag dissolved. In the subsequent elections, the Centre Party campaigned on two fronts, against both the Papen government and National Socialists and reaffirmed their stance as the "constitution party" opposed to "any measure contrary to constitution, justice and law" and "unwilling to yield to terror". The July 1932 elections brought further losses to the mainstream parties and gains to the extremist parties.
Several methods are proposed for using quantum dots to improve existing light-emitting diode (LED) design, including quantum dot light-emitting diode (QD-LED or QLED) displays, and quantum dot white-light-emitting diode (QD-WLED) displays. Because quantum dots naturally produce monochromatic light, they can be more efficient than light sources which must be color filtered. QD-LEDs can be fabricated on a silicon substrate, which allows them to be integrated onto standard silicon-based integrated circuits or microelectromechanical systems.
== Availability == PRRT is not yet widely available, with various radiopharmaceuticals at different stages of clinical trials. The cost of small volume production of the relevant radionuclides is high. The cost of Lutathera, a commercial 177Lu-DOTATATE product, has been quoted by the manufacturer as £71,500 (€80,000 or $94,000 in July 2018) for 4 administrations of 7.4 GBq.
Sources: en.wikipedia.org
=== Theobromine and oxalate === Chocolate may be a factor for heartburn in some people because one of its constituents, theobromine, may affect the esophageal sphincter muscle in a way that permits stomach acids to enter the esophagus. Theobromine poisoning is an overdosage reaction to the bitter alkaloid, which happens more frequently in domestic animals than humans. However, daily intake of 50–100 g cocoa (0.8–1.5 g theobromine) by humans has been associated with sweating, trembling, and severe headache. Chocolate and cocoa contain moderate to high amounts of oxalate, which may increase the risk of kidney stones.
=== Other performance aspects === The evaluation of the performance cannot be considered complete without considering the limit of detection, the range of linear response and the signal reproducibility. EI is known as a low-efficiency ionization technique. Because less than 1/10 000 of the gas-phase sample molecules are ionized, impressive detection limits cannot be expected. However, the efficient interfacing mechanism of this interface allows picogram-level detection limit in selected ion monitoring (SIM) for most substances. On the other hand, soft ionization techniques such as ESI are, in some cases, far more efficient but generate fewer fragment ions. The cost of this attitude is paid in terms of structural information so that a second analyzer to generate MS/MS spectra is an obligation. A typical EI spectrum, in general, has extensive structural information, and a cheaper, single-stage mass spectrometer might be sufficient for analyte characterization or identification. As a rule of the thumb, nanogram-level sensitivity is obtained in full-scan mode for most substances. Linearity and reproducibility are two point of strength of the interface. Up to four orders of magnitude linearity with RSD lower than 10% are common values in many applications.
==== Fungal ==== Oral fungal infections are most commonly caused by different Candida species, such as Candida albicans, Candida glabrata and Candida tropicalis resulting in oral candidiasis. There are several predisposing factors to fungal infections, such as diabetes and recent use of antibiotics or steroid inhalers. Management includes identifying and addressing contributory factors, the use of topical or systemic antifungal agents, and oral hygiene instruction. Different presentations of oral candidiasis include:
Thus, for exothermic reactions (ΔH is negative), K decreases with an increase in temperature, but, for endothermic reactions, (ΔH is positive) K increases with an increase in temperature. An alternative formulation is
== Classification == The following schema is from the 2015 edition of Vertebrate Palaeontology. The invertebrate chordate classes are from Fishes of the World. While it is generally structured so as to reflect evolutionary relationships (similar to a cladogram), it also retains the traditional ranks used in Linnaean taxonomy.
Sources: en.wikipedia.org
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.
It binds REV-ERBα and REV-ERBβ and changes transcription of metabolic genes. This can affect circadian rhythm, lipid use, and mitochondrial function. The full downstream effects are still under study.
No. Some rodent studies show increased endurance, but controlled human trials are lacking. Claims about human performance are not established by published evidence.
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.