The short version of nuclear receptor fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-02-04 and is reviewed periodically as new material appears.
Preclinical research reported that GW501516 increased running endurance in mice and improved lipid profiles in some animal species. Early human trials explored effects on high-density lipoprotein cholesterol, triglycerides, and glucose handling, but the program was discontinued. Published human data are sparse and do not establish efficacy for any condition. Studies also examined PPAR delta in cancer biology, with conflicting findings across models. The relationship between receptor activation, tissue context, and disease risk remains an active area of investigation.
Anti-doping laboratories identify GW501516 and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is the usual matrix, and detection can occur after the parent compound has cleared from blood. The exact detection window depends on dose, formulation, individual metabolism, and assay sensitivity. Because the compound is prohibited at all times, athletes are subject to testing in and out of competition. Analytical methods continue to improve as new metabolites and designer analogs are characterized.
Legal status varies by country. In some places, cardarine is controlled under medicines or psychoactive substances laws; in others, it may be sold with minimal oversight as a research chemical. Customs agencies have intercepted shipments, and several national health agencies have issued warnings about products marketed for bodybuilding or performance enhancement. The lack of a standardized pharmaceutical supply means identity, purity, and contamination levels can differ widely between samples. These factors make cardarine a regulatory and public health concern rather than a conventional prescription drug.
Cardarine is a common name for GW501516, a synthetic compound first described in the 1990s as a selective agonist of the peroxisome proliferator-activated receptor delta. It was studied in preclinical models for metabolic and cardiovascular conditions, but it has not been approved as a medicine in the United States, Europe, or other major jurisdictions. Retail products labeled as cardarine are generally research chemicals or supplements, not pharmaceutical formulations. Because human safety and efficacy data remain limited, regulatory agencies treat it as an unapproved substance rather than a therapeutic product.
| Property | Value | Notes |
|---|---|---|
| Molecular target | PPAR delta (NR1C2) | Ligand-activated nuclear receptor. |
| Primary tissues studied | Skeletal muscle, liver, adipose | Effects on fatty acid oxidation and energy use. |
| Typical detection matrix | Urine | Used in anti-doping analysis. |
| Common analytical method | LC-MS/MS | Detects parent compound and metabolites. |
| Sport regulatory class | Prohibited at all times | Listed as a metabolic modulator by WADA. |
Detection of GW501516 in biological samples generally relies on liquid chromatography coupled with tandem mass spectrometry. Urine is a common matrix in anti-doping analysis, while blood or plasma may be used in research settings. Sample preparation can involve enzymatic hydrolysis, protein precipitation, or solid-phase extraction before instrumental analysis. Because the compound undergoes metabolism, assays may target the parent molecule, one or more metabolites, or both. Detection windows are not fixed; they depend on factors such as dose, route, individual metabolism, and assay sensitivity. Reference standards are required for accurate identification and quantification.
Handling and quality assessment of cardarine reference material follow general laboratory practices for poorly characterized compounds. It typically appears as a white to off-white powder and is sparingly soluble in water but soluble in organic solvents such as dimethyl sulfoxide and ethanol. Storage recommendations usually specify a cool, dry, dark place, with long-term storage at low temperature and desiccation. Purity may be checked by high-performance liquid chromatography with ultraviolet detection, while identity is confirmed by mass spectrometry and nuclear magnetic resonance. No pharmacopeial monograph exists, so reported purity and stability depend on the supplier’s methods.
Laboratory handling focuses on identity, purity, and stability. Reference standards are typically stored cold and dry, protected from light, because solutions can degrade over time. Analytical checks may use high-performance liquid chromatography with ultraviolet detection or mass spectrometry. Impurities and related substances can be separated chromatographically and compared with a known standard. Because cardarine is not an approved drug, compendial monographs are absent, and laboratories often rely on in-house methods. Reported purity varies among unregulated products and should not be assumed from a label.
GW501516 binds and activates PPARδ, a nuclear receptor that influences transcription of genes involved in fatty acid oxidation and energy use. Activation shifts some metabolic pathways in preclinical models, which is why the compound has been studied for lipid disorders and exercise-related endpoints. The exact downstream effects in humans are incompletely mapped. PPARδ is expressed in many tissues, including skeletal muscle, liver, and adipose tissue, so broad activation may have varied consequences. Researchers continue to examine how selective or partial activation might alter the balance between benefits and risks.
PPARδ is a nuclear receptor that regulates gene expression related to fatty acid oxidation, glucose homeostasis, and mitochondrial function. GW501516 binds to this receptor with high affinity and activates downstream signaling in skeletal muscle and other tissues. Animal studies reported increased endurance and altered fuel preference, but human data remain limited and inconsistent. The precise relationship between receptor activation and observed physiological changes is still an area of active investigation. Researchers have also examined whether the compound affects inflammation or cell proliferation. No approved therapeutic indication exists for cardarine.
In laboratory settings, cardarine is studied as a tool compound for probing PPARδ biology. Published experiments often use cell cultures, rodent models, or isolated tissues. Some investigations focus on metabolic effects, while others assess potential risks such as carcinogenicity observed in long-term animal studies. Because human trials are sparse, most knowledge comes from preclinical work and adverse event reports. Scientific literature frequently notes the gap between animal findings and human outcomes. The compound is not a dietary supplement and is not intended for human consumption.
== External links == "Food Packaging -- Roles, Materials, and Environmental Issues - IFT.org". www.ift.org. Retrieved 3 December 2018. Poly(hydroxyalkanoates) for Food Packaging: Application and Attempts towards Implementation
Many Indian species have descended from those of Gondwana, the southern supercontinent from which India separated more than 100 million years ago. India's subsequent collision with Eurasia set off a mass exchange of species. However, volcanism and climatic changes later caused the extinction of many endemic Indian forms. Still later, mammals entered India from Asia through two zoogeographic passes flanking the Himalayas. This lowered endemism among India's mammals, which stands at 12.6%, contrasting with 45.8% among reptiles and 55.8% among amphibians. Among endemics are the vulnerable hooded leaf monkey and the threatened Beddome's toad of the Western Ghats. According to the IUCN Red List, India contains 1,021 threatened animal species—99 mammal, 82 bird, 105 reptile, 139 amphibian, 332 fish, 10 mollusk, and 254 other invertebrate—727 threatened plant species, and 4 threatened fungi species. Among them are the endangered Bengal tiger and the Ganges river dolphin. Critically endangered species include the gharial, a crocodilian; the great Indian bustard; and the Indian white-rumped vulture, which has become nearly extinct by having ingested the carrion of diclofenac-treated cattle. Before they were extensively used for agriculture and cleared for human settlement, the thorn forests of Punjab were mingled at intervals with open grasslands that were grazed by large herds of blackbuck preyed on by the Asiatic cheetah; the blackbuck, no longer extant in Punjab, is now severely endangered in India, and the cheetah is extinct.
== Clinical characteristics == Sloughing of the epidermis and exposure of the dermal layer clinically characterize moist desquamation. Moist desquamation presents as tender, red skin associated with serous exudate, hemorrhagic crusting, and has the potential for development of bullae.
Refugees typically rely on limited sources of vitamin B3 provided to them, often peanuts (which, in Africa, may be supplied in place of local groundnut staples, such as the Bambara or Hausa groundnut); the instability in the nutritional content and distribution of food aid can be the cause of pellagra in displaced populations. In the 2000s, outbreaks occurred in countries such as Angola, Zimbabwe, and Nepal. In Angola specifically, recent reports show a similar incidence of pellagra since 2002, with clinical pellagra in 0.3% of women and 0.2% of children, and niacin deficiency in 29.4% of women and 6% of children related to high untreated corn consumption. In other countries such as the Netherlands and Denmark, even with sufficient intake of niacin, cases have been reported. In this case, deficiency might happen not just because of poverty or malnutrition, but secondary to alcoholism, drug interaction (psychotropic, cytostatic, tuberculostatic, or analgesics), HIV, vitamin B2 and B6 deficiency, or malabsorption syndromes such as Hartnup disease and carcinoid tumors.
In response to the February 1945 Yalta Conference directives, a Polish Provisional Government of National Unity was formed in June 1945 under Soviet auspices; it was soon recognized by the United States and many other countries. The Soviet domination was apparent from the beginning, as prominent leaders of the Polish Underground State were brought to trial in Moscow (the "Trial of the Sixteen" of June 1945). In the immediate post-war years, the emerging communist rule was challenged by opposition groups, including militarily by the so-called "cursed soldiers", of whom thousands perished in armed confrontations or were pursued by the Ministry of Public Security and executed. Such guerillas often pinned their hopes on expectations of an imminent outbreak of World War III and defeat of the Soviet Union. The Polish right-wing insurgency faded after the amnesty of February 1947. The Polish people's referendum of June 1946 was arranged by the communist Polish Workers' Party to legitimize its dominance in Polish politics and claim widespread support for the party's policies. Although the Yalta agreement called for free elections, the Polish legislative election of January 1947 was controlled by the communists. Some democratic and pro-Western elements, led by Stanisław Mikołajczyk, former prime minister-in-exile, participated in the Provisional Government and the 1947 elections, but were ultimately eliminated through electoral fraud, intimidation and violence.
Sources: en.wikipedia.org
There are more than 300 known compounds in tequila, many of which are produced during the fermentation process, the raw material used, and to a lesser degree during the maturation. The volatile compounds responsible for the flavor and aroma profiles of the tequila are put into a category called organoleptic compounds and are known to increase in concentration with a slower fermentation process. Higher-order alcohols have a strong aroma, and the quantity present in each tequila depends on the carbon:nitrogen ratio and temperature during the cooking and fermentation processes. In general, the longer the controlled fermentation period, the higher yield of esters produced. For example, isovaleraldehyde seems to produce a sweet, cocoa, and chocolate-like flavor. 2 and 3-methylbutanal produce a malty flavor. The agave plant contains many phenolics such as vanillin and syringaldehydes, which present a strong and fruity or herbal aroma. It also contains eugenol, which can deliver a hint of spicy flavor to the tequila. Because the production of tequila involves heating, Maillard browning reactions occur, and furans are produced during the thermal degradation of sugar. The most prominent furanic compounds include 2-furaldehyde and 5-methylfuraldehyde, which can contribute to the smoky flavor of tequila. Guaiacol also seems to contribute to Tequila's smoky flavor. Beta-demascenone contributes to the woody, floral taste of tequila. Volatile compounds that contribute to the overall taste and aroma of tequila can be quantitatively assessed and evaluated by gas chromatography.
== Prognosis == The prognosis for individuals with Pompe disease varies according to the onset and severity of symptoms, along with lifestyle factors. Without treatment the infantile form (which can typically be predicted by mutation analysis) of the disease is particularly lethal — in these cases, the time taken to begin treatment is critical, with evidence that days (not weeks or months) matter. Myozyme (alglucosidase alfa) is a recombinant form of the human enzyme acid alpha-glucosidase, and is also currently being used to replace the missing enzyme. In a study which included the largest cohort of patients with Pompe disease treated with enzyme replacement therapy (ERT) to date findings showed that Myozyme treatment clearly prolongs ventilator-free survival and overall survival in patients with infantile-onset Pompe disease as compared to an untreated historical control population. Furthermore, the study demonstrated that initiation of ERT before six months of age, which could be facilitated by newborn screening, shows great promise to reduce the mortality and disability associated with this devastating disorder. Taiwan and several states in the United States have started newborn screening and results of such regimens in early diagnosis and early initiation of the therapy have dramatically improved the outcome of the disease; many of these babies have reached normal motor developmental milestones.
On the morning of March 10, examiners from the Federal Reserve and the Federal Deposit Insurance Corporation (FDIC) arrived at the offices of SVB to assess the company's finances. Several hours later, the California Department of Financial Protection and Innovation seized SVB citing inadequate liquidity and insolvency, and placed it into the receivership of the FDIC. The failure of SVB was the largest by assets of any bank since the 2008 financial crisis and the second-largest failure of an FDIC-insured bank. According to regulatory reports as of December 31, 2022, uninsured deposits were estimated to represent 89 percent of total deposits at the bank. With no other bank immediately offering to assume or guarantee them, the FDIC organized a Deposit Insurance National Bank of Santa Clara (DINB) to re-open the bank's branches the following Monday and enable access to insured deposits only. It announced that it would begin paying dividends for uninsured funds within the following week as SVB's assets were liquidated. Moody's Investor Service projected a recovery rate for uninsured depositors of 80–90 percent. The FDIC notified Silicon Valley Bank employees that they would be let go in 45 days' time; in the meantime, it offered salaried employees a 50% raise and hourly employees double pay for any overtime. The Federal Reserve Bank of San Francisco stated that the bank's CEO Greg Becker was no longer on its board of directors.
Dry-aged beef is beef that has been hung or placed on a rack to dry for several weeks. After the animal is slaughtered and cleaned, it is hung as a full or half carcass. Primal (large distinct sections) or sub primal cuts, such as strip loins, rib eyes, and sirloin, are placed in a refrigerator unit, also known as a "hot box". This process involves considerable expense, as the beef must be stored near freezing temperatures. Subprimal cuts can be dry aged on racks either in specially climate-controlled coolers or within a moisture-permeable drybag. Moreover, only the higher grades of meat can be dry aged, as the process requires meat with a large, evenly distributed fat content. Because of this, dry-aged beef is seldom available outside of steak restaurants and upscale butcher shops or groceries. The key effect of dry aging is the concentration and saturation of the natural flavour, as well as the tenderization of the meat texture. The process changes beef by two means. Firstly, moisture is evaporated from the muscle. The resulting process of desiccation creates a greater concentration of beef flavour and taste. Secondly, the beef's natural enzymes break down the connective tissue in the muscle, which leads to more tender beef. The process of dry-aging usually also promotes growth of certain fungal (mold) species on the external surface of the meat. This does not cause spoilage, but rather forms an external "crust" on the meat's surface, which is trimmed off when the meat is prepared for cooking.
Sources: en.wikipedia.org
=== Body weight === In the short and medium term, people taking a low-carbohydrate diet can experience more weight loss than people taking a low-fat diet. The Endocrine Society stated that "when calorie intake is held constant ... body-fat accumulation does not appear to be affected by even very pronounced changes in the amount of fat vs. carbohydrate in the diet". People on such a diet have very slightly more weight loss initially, equivalent to approximately 100kcal/day, but that advantage diminishes over time and is ultimately insignificant. A Cochrane review from 2022 looked into longer periods of two years and found no benefit for adhering to a low-carbohydrate diet in comparison to balanced diets. Much of the research comparing low-fat vs. low-carbohydrate dieting has been of poor quality and studies which reported large effects have garnered disproportionate attention in comparison to those which are methodologically sound. A 2018 review said "higher-quality meta-analyses reported little or no difference in weight loss between the two diets." Low-quality meta-analyses have tended to report favourably on the effect of low-carbohydrate diets: a systematic review reported that 8 out of 10 meta-analyses assessed whether weight loss outcomes could have been affected by publication bias, and 7 of them concluded positively. A 2017 review concluded that a variety of diets, including low-carbohydrate diets, achieve similar weight loss outcomes, which are mainly determined by calorie restriction and adherence rather than the type of diet.
=== Formation === There are several hypotheses proposed regarding the formation of Tarlov cysts, including: hemorrhagic infiltration of spinal tissue, inflammation within the nerve root cysts followed by inoculation of fluids, developmental or congenital origin, arachnoidal proliferation along and around the exiting sacral nerve root, and breakage of venous drainage in the perineuria and epineurium secondary to hemosiderin deposition after trauma. Tarlov himself theorized that the perineural cysts form as a result of blockage of venous drainage in the perineurium and epineurium secondary to hemosiderin deposition, after local trauma. Another theory gaining increasing popularity, over the past decade, is one postulated by Fortuna et al.; it described perineural cysts to be the results of congenital arachnoidal proliferation along the exiting sacral nerve roots. Some research on the migration of inflammatory cell into spinal has been studied. Additionally, in vivo and in vitro studies show inflammation induced by CNS injury causes distinct cystic cavitations created by astrocyte migration.
== Interactions == Theoretical considerations suggest calcineurin inhibitors like ciclosporin and tacrolimus might interact with mifamurtide because of their effect on macrophages. High-dose NSAIDs block the mechanism of mifamurtide in vitro. Consequently, the combination of mifamurtide with these types of drugs is contraindicated. However, mifamurtide can be coadministered with low doses of NSAIDs. No evidence suggests mifamurtide interacts with the studied chemotherapeutics, or with the cytochrome P450 system.
During the development of Half-Life 2, Newell spent months developing Steam, a digital distribution service for games. By 2011, Steam controlled between 50% and 70% of the market for downloaded PC games and generated most of Valve's revenue. At a technology conference in Seattle that year, Newell argued that software piracy was best addressed by offering a superior option rather than pursuing anti-piracy technology. He cited Steam's success in Russia, where piracy is rife, as an example. Following the difficult development of Half-Life 2, Newell said he became "obsessed" with improving Valve's work-life balance.In 2007, Newell expressed his displeasure over developing for game consoles, saying that developing processes for Sony's PlayStation 3 was a "waste of everybody's time". On stage at Sony's keynote at E3 2010, he acknowledged his criticism but discussed the open nature of the PlayStation 3 and announced a port of Portal 2, remarking that with Steamworks support it would be the best version for any console. Newell also criticized the Xbox Live service, referring to it as a "train wreck", and Windows 8, calling it a threat to the open nature of PC gaming. At the 2013 LinuxCon, Newell said the Linux operating system and open source development were "the future of gaming". He accused the proprietary systems of companies such as Microsoft and Apple of stifling innovation through slow certification processes.
(CH2CH2)O + HCl → HO–CH2CH2–Cl The reaction with these acids competes with the acid-catalyzed hydration of ethylene oxide; therefore, there is always a by-product of ethylene glycol with an admixture of diethylene glycol. For a cleaner product, the reaction is conducted in the gas phase or in an organic solvent. Ethylene fluorohydrin is obtained differently, by boiling hydrogen fluoride with a 5–6% solution of ethylene oxide in diethyl ether. The ether normally has a water content of 1.5–2%; in absence of water, ethylene oxide polymerizes. Halohydrins can also be obtained by passing ethylene oxide through aqueous solutions of metal halides:
Sources: en.wikipedia.org
It binds to and activates PPAR delta, a nuclear receptor that controls expression of genes related to fatty acid oxidation. This mechanism can alter energy metabolism in animal models. It is not a direct stimulant or fat-burning enzyme.
Early-stage trials examined lipid and glucose markers, but the development program was discontinued. Published human results are limited and do not support approved use for any indication. Claims of performance or health benefits remain unproven.
Yes. Laboratories use LC-MS/MS to detect GW501516 and its metabolites in urine. Detection depends on timing and sensitivity, but the substance is banned at all times.
No. Major drug regulators have not approved GW501516 for treating any medical condition. Products sold as cardarine are typically unapproved research chemicals or supplements, so their contents and safety are not assured.