The short version of LC-MS/MS fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-07-29 and is reviewed periodically as new material appears.
Early clinical research explored GW501516 for lipid disorders, obesity, and diabetes. Some short-term human studies reported changes in HDL cholesterol, LDL cholesterol, and triglycerides. The development program was discontinued after rodent studies showed dose-dependent tumor formation in multiple tissues, including liver, bladder, stomach, and skin. These findings raised concerns about long-term cancer risk in humans. Because human exposure data are limited, the clinical significance of the rodent tumors remains uncertain.
Literature on cardarine often separates receptor pharmacology from toxicology. Mechanistic papers describe PPARδ activation and gene expression changes, while safety assessments focus on carcinogenicity and species differences. Questions remain about whether rodent tumors arise through PPARδ-dependent or off-target mechanisms. Another open area is how human metabolism and exposure compare with those in animal studies. Analytical methods such as liquid chromatography–mass spectrometry are used to confirm identity in biological and product samples.
Human trials of GW501516 were small and short in duration. They examined lipid levels, glucose handling, and other metabolic markers, but the programs were halted after the animal cancer findings. No approved therapeutic product exists, and published human data are insufficient for establishing long-term safety. Reports of use for athletic performance come mainly from non-clinical settings and cannot be verified through controlled trials. Independent testing of products sold as cardarine has found inconsistent purity and labeling.
Laboratory studies indicate that GW501516 activates PPARδ, a nuclear receptor involved in fatty acid oxidation and energy metabolism. In rodent experiments, treated animals often showed increased endurance and reduced fat mass. These effects were observed under controlled conditions and do not establish safe or effective use in humans. The exact dose-response relationship in humans remains poorly characterized. Species differences in metabolism can affect how results translate across animals and people.
Safety concerns emerged from long-term animal studies. In rodents given the compound for extended periods, researchers found an increased incidence of certain cancers, including liver and bladder tumors. These findings contributed to the discontinuation of clinical development. Whether similar risks apply to short-term or low-level exposure in humans is not established, and controlled human safety data are limited. The relevance of high-dose rodent carcinogenicity findings to human use remains a subject of debate.
| Property | Value | Notes |
|---|---|---|
| Primary target | PPARδ | Nuclear receptor; not androgen receptor |
| Studied indications | Dyslipidemia; obesity; diabetes | Early clinical research; development discontinued |
| Rodent toxicity | Tumor formation in multiple tissues | Dose-dependent findings in some studies |
| Human approval | None | No approved therapeutic use |
| Typical analytical method | LC-MS/MS | Used for identity and quantification |
It was thought that with fewer malocclusions, breastfed children may have a reduced need for orthodontic intervention. The report suggested that children with a well-rounded, "U-shaped" dental arch, which is found more commonly in breastfed children, may have fewer problems with snoring and sleep apnea in later life. A 2016 review found that breastfeeding protected against malocclusions. Breastfeeding duration has been correlated with child maltreatment outcomes, including neglect and sexual abuse.
Restriction of energy intake relative to requirements leading to a low body weight. (Criterion A) Intense fear of gaining weight or persistent behaviors that interfere with gaining weight. (Criterion B) Disturbance in the way a person's weight or body shape is experienced or a lack of recognition about the risks of the low body weight. (Criterion C) Relative to the previous version of the DSM (DSM-IV-TR), the 2013 revision (DSM-5) reflects changes in the criteria for anorexia nervosa. Most notably, the amenorrhea (absent period) criterion was removed. Amenorrhea was removed for several reasons: it does not apply to males, it is not applicable for females before the age of menstruation, during or after the menopause, or women of any age taking birth control. Additionally, some women who meet the other criteria for AN still report some menstrual activity.
=== Industries and economic zones === Ningxia was a major recipient of China's investment in industrial capacity during the Third Front campaign. Yinchuan Economic and Technological Development Zone was established in 1992. Spanning 32 km2 (12 sq mi), it has an annual economic output Rmb23.7 billion (25.1% up) (US$3.5 billion). Major investors are mainly local enterprises such as Kocel Steel Foundry, FAG Railway Bearing (Ningxia), Ningxia Little Giant Machine Tools, etc. Major industries include machinery and equipment manufacturing, new materials, fine chemicals and the animation industry. Desheng Industrial Park (in Helan County) is a base for about 400 enterprises. The industrial park has industrial chains from Muslim food and commodities to trade and logistics, new materials and bio-pharmaceuticals that has 80 billion yuan in fixed assets. Desheng is looking to be the most promising industrial park in the city. It achieved a total output value of 4.85 billion in 2008, up 40 percent year-on-year. The local government plans to cut taxes and other fees to reduce the burden on local enterprises. The industrial output value reached 2.68 billion yuan in 2008, an increase of 48 percent from a year earlier.
=== Acidity === Thiols are easily deprotonated. Relative to the alcohols, thiols are more acidic. The conjugate base of a thiol is called a thiolate. Butanethiol has a pKa of 10.5 vs 15 for butanol. Thiophenol has a pKa of 6, versus 10 for phenol. A highly acidic thiol is pentafluorothiophenol (C6F5SH) with a pKa of 2.68. Thus, thiolates can be obtained from thiols by treatment with alkali metal hydroxides.
=== Localization in cell and morphogenetic role === In 1933, while studying virgin sea urchin eggs, Jean Brachet suggested that DNA is found in the cell nucleus and that RNA is present exclusively in the cytoplasm. At the time, "yeast nucleic acid" (RNA) was thought to occur only in plants, while "thymus nucleic acid" (DNA) only in animals. The latter was thought to be a tetramer, with the function of buffering cellular pH. During the 1930s, Joachim Hämmerling conducted experiments with Acetabularia in which he began to distinguish the contributions of the nucleus and the cytoplasm substances (later discovered to be DNA and messenger RNA (mRNA), respectively) to cell morphogenesis and development.
Sources: en.wikipedia.org
=== Health === On October 1, 2019, Sanders was hospitalized after experiencing chest pains at a campaign event in Las Vegas. His campaign announced the next day that a blockage had been found in one coronary artery and two stents inserted. Scheduled campaign events and appearances were canceled until further notice. Two days later his campaign released a statement that he had been diagnosed with a heart attack. He was released from the hospital the same day. The statement included the following from Sanders's doctors:
The metabolism of propionyl-CoA occurs in the mitochondria and requires Vitamin B12 (as adenosylcobalamin) to make succinyl-CoA. When the conversion of propionyl-CoA to succinyl-CoA in the mitochondria fails due to Vitamin B12 deficiency, elevated blood levels of methylmalonic acid (MMA) occur. Thus, elevated blood levels of homocysteine and MMA may both be indicators of vitamin B12 deficiency. Adenosylcobalamin is needed as cofactor in methylmalonyl-CoA mutase—MUT enzyme. Processing of cholesterol and protein gives propionyl-CoA that is converted to methylmalonyl-CoA, which is used by MUT enzyme to make succinyl-CoA. Vitamin B12 is needed to prevent anemia, since making porphyrin and heme in mitochondria for producing hemoglobin in red blood cells depends on succinyl-CoA made by vitamin B12.
==== Retrograde ejaculation ==== This means that the sperm is produced in the testes but on its way out, it gets misdirected into the bladder rather than coming out through the urethra. This can lead to a low volume of semen (hypospermia) or no semen production (aspermia). Structural or functional damage to the bladder neck muscle causes the backflow of semen during the ejaculation. Nerve damage caused by medical conditions such as diabetes or multiple sclerosis can affect the function of bladder neck muscle. Also, surgery or trauma along with the medications used for hypertension and benign prostatic hyperplasia can contribute to bladder neck problems. Retrograde ejaculation can be diagnosed by the presence of sperm in the urine.
Such was the likelihood of Manchester United going on to retain the title, bookmaker Fred Done paid out on punters with two months of the season left. Arsenal steadily closed the gap, however, and victory against Wimbledon in March 1998 set up a title clash between themselves and the reigning champions. Wenger in the lead up to the game maintained it was possible for Arsenal to win the league, stating "two or three weeks ago, the title was just a dream for us and people laughed when I said we could still do it". He suggested Manchester United were responsible for making the title race "interesting". At Old Trafford, Overmars scored the decisive goal to give Arsenal a 1–0 win. The victory was followed by nine consecutive league wins, the last of which was a home fixture against Everton that secured Arsenal's status as champions. Wenger became the first foreign manager to win the double, when his team beat Newcastle United in the 1998 FA Cup Final. Wenger sanctioned Wright's transfer to West Ham in the summer and made Anelka his first-choice striker ahead of the 1998–99 season. His decision not to bolster Arsenal's attack, coupled with Bergkamp's fear of flying, meant the club entered the Champions League with just one recognised striker. Their time in the competition was brief, making an exit at the group stage, with their domestic form being indifferent. Needing to strengthen their attacking options, Arsenal signed Nwankwo Kanu in January 1999, and his presence reinvigorated the team as they embarked on a run similar to last season.
=== Mineral resources === Ningxia is rich in mineral resources with proven deposits of 34 kinds of minerals, much of which located in grassland areas. In 2011 it was estimated that the potential value per capita of these resources accounted for 163.5 percent of the nation's average. Ningxia boasts verified coal reserves of over 30 billion tons, with an estimated reserve of more than 202 billion tons, ranking sixth nationwide. Coal deposits are spread over one-third of the total surface of Ningxia, and mined in four major fields in the Helan and Xiangshan mountains, Ningdong and Yuanzhou (or Guyuan). The region's reserves of oil and natural gas can be found in Yanchi and Lingwu County, and are ideal for large-scale development of oil, natural gas and chemical industries. Ningxia leads China in gypsum deposits, with a proven reserve of more than 4.5 billion tons, of which the rarely found, top-grade gypsum accounts for half of the total deposits. The Hejiakouzi deposit in Tongxin County features a reserve of 20 million tons of gypsum with a total thickness of 100 meters. There is a considerable deposit of quartz sandstone, of which 17 million tons have been ascertained. In addition, there are phosphorus, flint, copper, iron, barite, other minerals and Helan stone – a special clay stone.
Sources: en.wikipedia.org
RSH + R′Br + B → RSR′ + [HB]Br (B = base) Many electrophiles participate in this reaction. α,β-Unsaturated carbonyl compounds add thiols, especially in the presence of base catalysts. Thiolates react with carbon disulfide to give thioxanthate (RSCS−2).
=== RNA was likely critical for prebiotic evolution === The discovery of catalytic RNA (ribozymes) showed that RNA could both encode genetic information (like DNA) and catalyze specific biochemical reactions (like protein enzymes). This realization led to the RNA World Hypothesis, a proposal that RNA may have played a critical role in prebiotic evolution at a time before the molecules with more specialized functions (DNA and proteins) came to dominate biological information coding and catalysis. Although it is not possible for us to know the course of prebiotic evolution with any certainty, the presence of functional RNA molecules with common ancestry in all modern-day life forms is a strong argument that RNA was widely present at the time of the last common ancestor.
The most diverse and richest forests are the mixed-mesophytic or medium-moisture types, which are largely confined to rich, moist montane soils of the southern and central Appalachians, particularly in the Cumberland and Allegheny Mountains, but also thrive in the southern Appalachian coves. Characteristic canopy species are white basswood (Tilia heterophylla), yellow buckeye (Aesculus octandra), sugar maple (Acer saccharum), American beech (Fagus grandifolia), tuliptree (Liriodendron tulipifera), white ash (Fraxinus americana) and yellow birch (Betula alleganiensis). Other common trees are red maple (Acer rubrum), shagbark and bitternut hickories (Carya ovata and C. cordiformis) and black or sweet birch (Betula lenta ). Small understory trees and shrubs include paw paw (Asimina tribola), flowering dogwood (Cornus florida), hophornbeam (Ostrya virginiana), witch-hazel (Hamamelis virginiana) and spicebush (Lindera benzoin). There are also hundreds of perennial and annual herbs, among them such herbal and medicinal plants as American ginseng (Panax quinquefolius), goldenseal (Hydrastis canadensis), bloodroot (Sanguinaria canadensis) and black cohosh (Cimicifuga racemosa). The foregoing trees, shrubs, and herbs are also more widely distributed in less rich mesic forests that generally occupy coves, stream valleys and flood plains throughout the southern and central Appalachians at low and intermediate elevations.
== Storage and preservation == Storehouses, which were used primarily for military purposes, were used by the Inca to facilitate traveling over long distances. Being placed conveniently along major travel routes, the storehouses acted as a place of refuge when it came to the restocking of resources. Location was chosen strategically for the purpose of securing a cooler area characterized by higher ventilation to prevent rotting of perishable items. Perishable foods ranged, while some were prepared to a certain extent, some were completely untreated. Freeze-dried foods were common in the storehouses, such as ch'arki, which is a form of dried meat. Additionally, potato tubers were freeze-dried and stored as chuño. Storehouses quickly became a valued practice for the Inca, but were limited at times when communities prioritized local growth of foods, instead. Archaeologists have excavated ceramic vessels that provide evidence for different types of storage and preservation methods. Aríbalos, vessels with high flaring necks and cone-shaped bases, are interpreted to have been used as a way of storing chicha. Additionally, ceramic vessels could have been used for storage of foods in water or for long-term preparation methods.
Sources: en.wikipedia.org
It targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not act primarily on androgen receptors. This distinction separates it from SARMs.
Rodent studies found dose-dependent tumors in several organs. The sponsor discontinued the program over cancer concerns. Human risk from long-term use remains unknown.
Controlled human endurance trials are lacking. Animal studies show increased exercise capacity under some conditions. Anecdotal reports are not equivalent to clinical evidence.
Rodent studies reported increased endurance and fat oxidation after GW501516 exposure. Long-term studies also found higher rates of some tumors, which led to halted development.