LC-MS/MS comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2026-05-22. Numbers and descriptions here follow the published literature rather than marketing material.
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.
In the fitness and bodybuilding literature, cardarine is frequently discussed as an endurance agent or fat-loss compound, although such claims are not supported by robust clinical evidence. Online descriptions often mix animal data, user anecdotes, and marketing language. Researchers who study PPARδ agonists distinguish between receptor activation in controlled experiments and unsupervised use of unverified products. The latter introduces unknown purity, dose, and interactions, making reported experiences difficult to interpret scientifically.
GW501516 acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in transcription of genes related to lipid handling and energy use. Activation of PPARδ can shift skeletal muscle toward greater fatty acid oxidation in animal models, which is one reason it drew interest for metabolic disease and exercise research. The exact downstream effects depend on tissue, species, dose, and duration. Human data are sparse, so many proposed benefits remain hypotheses rather than established clinical outcomes.
| Property | Value | Notes |
|---|---|---|
| Primary target | PPARδ (NR1C2) | Nuclear receptor involved in lipid metabolism |
| Preclinical effect | Increased fatty acid oxidation | Observed in rodent studies |
| Key safety signal | Tumors in rodents after long-term exposure | Contributed to halted clinical development |
| Human trial status | No approved product; development stopped | Limited short-term metabolic data |
| Sport regulatory status | Prohibited at all times | WADA hormone and metabolic modulators class |
Because cardarine is not an approved medicine, no pharmacopeial monograph defines its identity, purity, or storage requirements. Laboratories typically rely on in-house methods and reference standards when testing materials labeled as GW501516. Certificates of analysis may report purity and identity for a specific batch, but their scope varies and they do not guarantee safety or legal status. Independent verification can include high-performance liquid chromatography, mass spectrometry, nuclear magnetic resonance, and elemental analysis. The distinction between research chemical labeling and human use is significant because quality standards and oversight differ.
Cardarine can be detected in biological samples and product materials using liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS). The method separates compounds by chromatography and identifies them by mass-to-charge transitions, allowing low-level detection in urine or blood. Sample preparation often involves enzymatic hydrolysis, solid-phase extraction, or protein precipitation. Certified reference materials and isotope-labeled internal standards improve quantification. Detection windows depend on metabolism, matrix, and assay sensitivity, so no single universal window applies.
Regulatory treatment of cardarine differs by context and jurisdiction. In competitive sport, the World Anti-Doping Agency lists PPARδ agonists, including GW501516, as prohibited at all times. Outside sport, it lacks approval as a prescription medicine in major drug markets, and products sold for human consumption may be treated as unapproved drugs. Some countries also restrict importation or sale through general consumer protection and medicines laws. These classifications affect availability, testing, and legal risk without establishing therapeutic value.
The compound is typically described as a laboratory compound rather than a therapeutic product. Published reports have explored its role in lipid disorders, insulin sensitivity, and exercise metabolism, yet no major drug regulator has approved it for medical use. Commercial samples sold under the cardarine name may vary in purity and identity. Analytical confirmation is therefore necessary when the material is discussed in scientific or regulatory contexts. Its classification as a prohibited substance in sport further shapes how it is studied and reported.
Cardarine is a common name for GW501516, a synthetic compound studied for its effects on lipid and glucose metabolism. It functions as an agonist at peroxisome proliferator-activated receptor delta, or PPARδ, a nuclear receptor that influences gene expression. The molecule is not a steroid, nor is it a selective androgen receptor modulator. It is also known in research and sports literature as GW-501516 and endurobol. Early laboratory work examined its metabolic activity in cell cultures and animal models.
Activation of PPARδ changes transcription of genes involved in fatty acid transport, mitochondrial function, and skeletal muscle fuel preference. In rodent studies, pharmacological PPARδ activation was associated with increased endurance and altered body composition. These findings generated interest in performance enhancement, but species differences and study designs limit direct extrapolation to humans. Small human trials were conducted in the 2000s and later discontinued. The extent to which cardarine produces similar metabolic or performance effects in people remains an open question.
Clinical development stopped after rodent studies showed tumors at multiple sites. Whether those findings predict human cancer risk remains an open question, but they led sponsors to discontinue programs. Human safety data are limited to small, short-term studies that were not designed to assess cancer risk. Reported effects in those studies included changes in blood lipids, but the evidence is insufficient for medical use. Long-term consequences of nonmedical use are not well characterized. Questions about dose, duration, and individual susceptibility remain unresolved.
Cardarine is a common name for GW501516, an investigational compound developed in the 1990s for metabolic conditions. It acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in lipid and energy metabolism. The compound is frequently mislabeled as a selective androgen receptor modulator, or SARM, but its molecular target is different. GW501516 reached early clinical testing before development was discontinued. It has no approved therapeutic use in any country. The name cardarine is not a formal international nonproprietary name.
Regulatory treatment varies, but cardarine is not approved as a medicine. Sports authorities list GW501516 as a prohibited substance, and it is banned at all times under the World Anti-Doping Agency code. Many countries restrict sales for human consumption, while online vendors market it as a research chemical. Such products may lack purity data, and their actual contents can differ from the label. Purchasing or possessing cardarine may carry legal consequences depending on jurisdiction. The compound is not a dietary supplement ingredient in regulated markets.
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.
GW501516 acts as an agonist at the peroxisome proliferator-activated receptor delta, a nuclear receptor that regulates gene expression. Activation shifts transcription toward genes involved in fatty acid uptake, oxidation, and energy expenditure. The compound does not bind the androgen receptor and therefore differs from anabolic steroids and SARMs. In rodent models, this metabolic shift has been linked to increased running endurance and reduced fat accumulation. The exact downstream pathways in humans remain incompletely characterized.
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.
==== 2013 resignation ==== In November 2013, Lad resigned from the Karnataka cabinet following allegations relating to illegal mining involving V. S. Lad & Sons, a company associated with his family. Contemporary reports stated that the company had been accused of illegal extraction and supply/export of iron ore. Lad said he resigned to avoid embarrassment to the Congress government and described his decision as a moral one. The resignation followed scrutiny of mining activity in the Ballari region and allegations concerning the classification of the company's mining lease. Reporting at the time also noted that the Karnataka Lokayukta had raised allegations concerning the company's mining activities.
Arguing in favour of independence, President Mangope claimed that the move would enable its population to negotiate with Pretoria from a stronger position: "We would rather face the difficulties of administering a fragmented territory, the wrath of the outside world, and accusations of ill-informed people. It's the price we are prepared to pay for being masters of our own destiny." United Nations Secretary-General Kurt Waldheim stated that he "strongly deplored" the establishment of "another so-called independent tribal homeland in pursuance of the discredited policies of apartheid", and in resolution A/RES/32/105N, passed on 14 December 1977, the United Nations General Assembly linked Bophuthatswana's "so-called 'independence'" to South Africa's "stubborn pursuit" of its policies, and called upon all governments to "deny any form of recognition to the so-called 'independent' bantustans". During a parliamentary debate in the UK on 6 December 1977, Foreign Secretary David Owen replied in the negative when asked "whether Her Majesty's Government intend to recognise travel documents issued by the authorities of ... Bophuthatswana for the purpose of admitting visitors to the United Kingdom". While the majority of news reports echoed these official declarations, there were others which opined that Western critics should "suspend judgment for a time", and despite its generally critical stance on South Africa's policies, Time magazine wrote that Bophuthatswana had "considerable economic potential" with an expected $30 million a year coming from mining revenues.
According to Harvard Professor Kenneth Rogoff as of 2025, bitcoin is rarely used in regular transactions with merchants, but is popular in the informal economy and for criminal activities. Prices are not usually quoted in bitcoin and trades involve conversions into fiat currencies. Commonly cited reasons for not using bitcoin include high costs, the inability to process chargebacks, high price volatility, long transaction times, and transaction fees (especially for small purchases). Bloomberg reported that bitcoin was being used for large-item purchases on the site Overstock.com and for cross-border payments to freelancers. As of 2015, there was little sign of bitcoin use in international remittances despite high fees charged by banks and Western Union. From September 2021 until January 2025, the Bitcoin Law made bitcoin a legal tender currency in El Salvador, alongside the US dollar. The adoption had been criticized internationally and within El Salvador. In 2022, the International Monetary Fund (IMF) urged El Salvador to reverse its decision. As of 2022, the use of Bitcoin in El Salvador remained low: 80% of businesses refused to accept it. In 2025, El Salvador's government revoked bitcoin's status as legal tender currency to comply with conditions set by the IMF for a loan. El Salvador still describes bitcoin as "legal tender", but its acceptance is no longer obligitory (as it is with the US dollar) and the El Salvador government no longer accepts bitcoin for payment of taxes or fees.
Come What(ever) May is the second studio album by American rock band Stone Sour, released on August 1, 2006, by Roadrunner Records. It was recorded and produced by Nick Raskulinecz and the band at Studio 606 in Los Angeles, California. Writing for the album began as early as 2003 when vocalist Corey Taylor and guitarist James Root were writing material for their other band, Slipknot. In January 2006, Stone Sour began recording their second album, during which time drummer Joel Ekman left the band because of family constraints. He was eventually replaced by ex-Soulfly drummer Roy Mayorga who played on all but two tracks on the album. Following the release of the album, Stone Sour promoted it for over a year, releasing five singles and touring in the United States, Canada, Japan and several countries in Europe. The album received generally positive reviews. It was praised for showing a progression in the band's songwriting ability and musical style. It was also certified Platinum in the United States and the single "30/30-150" was nominated for Best Metal Performance at the 49th Grammy Awards. On June 26, 2007, Stone Sour released a special edition version of the album; it included six previously unreleased tracks and a bonus DVD with three music videos and a complete live performance by the band in Moscow. It remains their best-selling album to date, mostly due to the success of the single "Through Glass". The album became their first to be certified Platinum by the RIAA which occurred on July 21, 2017.
Shortly after the discovery of the neutron in 1932, Enrico Fermi realized that certain rare beta-decay reactions immediately yield neutrons as an additional decay particle, so called beta-delayed neutron emission. Neutron emission usually happens from nuclei that are in an excited state, such as the excited 17O* produced from the beta decay of 17N. The neutron emission process itself is controlled by the nuclear force and therefore is extremely fast, sometimes referred to as "nearly instantaneous". Isolated proton emission was eventually observed in some elements. It was also found that some heavy elements may undergo spontaneous fission into products that vary in composition. In a phenomenon called cluster decay, specific combinations of neutrons and protons other than alpha particles (helium nuclei) were found to be spontaneously emitted from atoms.
Sources: en.wikipedia.org
Emicerfont (GW-876,008) is a drug developed by GlaxoSmithKline which acts as a CRF-1 antagonist. Corticotropin releasing factor (CRF), also known as Corticotropin releasing hormone, is an endogenous peptide hormone which is released in response to various triggers such as chronic stress, and activates the two corticotropin-releasing hormone receptors: CRF1 and CRF2. This then triggers the release of corticotropin (ACTH), another hormone which is involved in the physiological response to stress. Emicerfont blocks the CRF1 receptor, and so reduces ACTH release. It has been investigated for the treatment of irritable bowel syndrome (IBS) and alcoholism, and while it was not effective enough to be adopted for medical use in these applications, it continues to be used for research, as the role of the CRH-ACTH system in IBS remains poorly understood.
1 August 1919: Sejm Ustawodawczy votes on a resolution on the "Temporary Organisation of Government in the former Prussian Partition" (O tymczasowej organizacji zarządu byłej dzielnicy pruskiej), creating the Ministry of the Former Prussian Partition and a plan of gradual unification of Greater Poland with the rest of the country. 12 August 1919: Władysław Seyda becomes the first minister of the Former Prussian Partition. 19 August 1919: The NRL is dissolved. 28 August 1919: The headquarters of the Polish Army decides that the Greater Polish Army will join the Polish Army and that its headquarters will be transferred to the headquarters of the Seventh Corps. 6 November 1919: The Commission of the NRL is dissolved. 10 January 1920: Ratification of Treaty of Versailles, which has Polish forces in Greater Poland take control over small amounts of Greater Poland's territories given to Poland that are resisting German control and Eastern Pomerania. 13 January 1920: The headquarters of the Greater Poland front orders preparations for implementing the treaty. 17 January 1920: beginning of the occupation of the remaining German-held territories assigned to Poland by the treaty. 8 March 1920: The Greater Poland front is dissolved.
=== Dietary recommendations === The U.S. Institute of Medicine (IOM) updated Estimated Average Requirements (EARs) and Recommended Dietary Allowances (RDAs) for zinc in 2001. The current EARs for zinc for women and men ages 14 and up is 6.8 and 9.4 mg/day, respectively. The RDAs are 8 and 11 mg/day. RDAs are higher than EARs so as to identify amounts that will cover people with higher-than-average requirements. RDA for pregnancy is 11 mg/day. RDA for lactation is 12 mg/day. For infants up to 12 months, the RDA is 3 mg/day. For children ages 1–13 years, the RDA increases with age from 3 to 8 mg/day. As for safety, the IOM sets Tolerable upper intake levels (ULs) for vitamins and minerals when evidence is sufficient. In the case of zinc the adult UL is 40 mg/day (lower for children). Collectively the EARs, RDAs, AIs and ULs are referred to as Dietary Reference Intakes (DRIs). The European Food Safety Authority (EFSA) refers to the collective set of information as Dietary Reference Values, with Population Reference Intake (PRI) instead of RDA, and Average Requirement instead of EAR. AI and UL are defined the same as in the United States. For people ages 18 and older, the PRI calculations are complex, as the EFSA has set higher and higher values as the phytate content of the diet increases. For women, PRIs increase from 7.5 to 12.7 mg/day as phytate intake increases from 300 to 1200 mg/day; for men, the range is 9.4 to 16.3 mg/day. These PRIs are higher than the U.S. RDAs. The EFSA reviewed the same safety question and set its UL at 25 mg/day, which is much lower than the U.S.
14 July Prime Minister Keir Starmer condemns the attempted assassination of Donald Trump at a rally in Pennsylvania, saying: "I am appalled by the shocking scenes at President Trump's rally and we send him and his family our best wishes. Political violence in any form has no place in our societies and my thoughts are with all the victims of this attack." 2024 Wimbledon Championships: Carlos Alcaraz wins the Men's singles final, defeating Novak Djokovic for the second consecutive year. The Met Office issues a yellow weather warning for heavy rain for parts of England and Wales for the following day. Euro 2024: England are beaten 2–1 against Spain in the final of the tournament. A peak TV audience of 23.8 million across the BBC and ITV is reported, the highest combined audience for any TV event broadcast this year so far. Buckingham Palace announces that King Charles III and Queen Camilla will visit Australia and Samoa in October. 15 July Disappearance of Jay Slater: Spanish police announce that search teams looking for Jay Slater in Tenerife have found a body. A 34-year-old man appears in court and is remanded in custody charged with the murders of Albert Alfonso and Paul Longworth, whose remains were found in suitcases at the Clifton Suspension Bridge. A new search begins for the body of Muriel McKay, who was kidnapped in December 1969 and held for ransom, then later killed. Figures show that 427 migrants crossed the English Channel in small boats, the highest daily number since Keir Starmer became the prime minister.
== Epidemiology == Marfan syndrome affects males and females equally, and the mutation shows no ethnic or geographical bias. Estimates indicate about 1 in 5,000 to 10,000 individuals have Marfan syndrome.
Sources: en.wikipedia.org
The behaviour of fluids at the microscale can differ from "macrofluidic" behaviour in that factors such as surface tension, energy dissipation, and fluidic resistance start to dominate the system, as opposed to inertial effects. Microfluidics studies how these behaviours change, and how they can be worked around, or exploited for new uses. At small scales (channel size of around 100 nanometers to 500 micrometers) some unintuitive properties appear. In particular, the Reynolds number (which compares the effect of the momentum of a fluid to the effect of viscosity) can become very low. One consequence is co-flowing fluids do not necessarily mix in the traditional sense, as flow becomes laminar rather than turbulent; molecular transport between them must often be through diffusion. High specificity of chemical and physical properties (concentration, pH, temperature, shear force, etc.) can also be ensured resulting in more uniform reaction conditions and higher grade products in single and multi-step reactions.
==== Philippines ==== "Soup Number Five" (also Soup No. 5, Soup #5) is a Filipino soup made from bull's testes or penis. It is believed to have aphrodisiac properties. Cebu's variant of Soup Number Five is called lansiao (also lanciao; from Chinese: 𡳞鳥; Pe̍h-ōe-jī: lǎn-chiáu, penis) from Philippine Hokkien. Soup Number Five is popularly known as "Remember Me" ("RM") in Cagayan de Oro in Mindanao, supplanting its other names in the northern regions of the Philippines.
=== Actual consequences === In retrospect, it is now known that smoke from the Kuwait oil fires only affected the weather pattern throughout the Persian Gulf and surrounding region during the periods that the fires were burning in 1991, with lower atmospheric winds blowing the smoke along the eastern half of the Arabian Peninsula, and cities such as Dhahran and Riyadh, and countries such as Bahrain experienced days with smoke filled skies and carbon soot rainout/fallout. Thus the immediate consequence of the arson sabotage was a dramatic regional decrease in air quality, causing respiratory problems for many Kuwaitis and those in neighboring countries. According to the 1992 study from Peter Hobbs and Lawrence Radke, daily emissions of sulfur dioxide (which can generate acid rain) from the Kuwaiti oil fires were 57% of that from electric utilities in the United States, the emissions of carbon dioxide were 2% of global emissions and emissions of soot reached 3400 metric tons per day. In a paper in the DTIC archive, published in 2000, it states that "Calculations based on smoke from Kuwaiti oil fires in May and June 1991 indicate that combustion efficiency was about 96% in producing carbon dioxide. While, with respect to the incomplete combustion fraction, Smoke particulate matter accounted for 2% of the fuel burned, of which 0.4% was soot." (With the remaining 2% being oil that did not undergo any initial combustion).
== Screening == Initial screening for CIP/CIM may be performed using an objective scoring system for muscle strength. The Medical Research Council (MRC) score is one such tool, and sometimes used to help identify CIP/CIM patients in research studies. The MRC score involves assessing strength in 3 muscle groups in the right and left sides of both the upper and lower extremities. Each muscle tested is given a score of 0–5, giving a total possible score of 60. An MRC score less than 48 is suggestive of CIP/CIM. However, the tool requires that patients be awake and cooperative, which is often not the case. Also, the screening tool is non-specific, because it does not identify the cause a person's muscle weakness. Once weakness is detected, the evaluation of muscle strength should be repeated several times. If the weakness persists, then a muscle biopsy, a nerve conduction study (electrophysiological studies), or both should be performed.
=== Site selection and planting === Blackcurrants can grow well on sandy or heavy loams, or forest soils, as long as their nutrient requirements are met. They prefer damp, fertile but not waterlogged ground and are intolerant of drought. Although the bushes are winter hardy, frosts during the flowering period may adversely affect the yield and cold winds may restrict the number of flying insects visiting and pollinating the flowers. A soil pH of about 6 is ideal for blackcurrants and the ground can be limed if the soil is too acidic. Planting is usually done in the autumn or winter to allow the plants to become established before growth starts in the spring, but container-grown stock can be planted at any time of year. Two-year-old bushes are usually planted but strong one-year-old stock can also be used. Planting certified stock avoids the risk of introducing viruses. On a garden scale the plants can be set at intervals of 1.5 to 1.8 m (5 to 6 ft) or they can be set in rows with planting intervals of 1.2 m (4 ft) and row separations of 2.5 m (8 ft) or more. In the UK, young bushes are generally planted deeper than their initial growing level to encourage new stems to grow from the base.
Sources: en.wikipedia.org
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.
Small short-term human trials examined metabolic markers such as lipids and glucose. The trials did not continue after rodent cancer findings, so long-term human safety is unknown.
Controlled human trials have not established a performance benefit. Anecdotal reports exist, but they are not reliable evidence.
It binds and activates PPARδ, a nuclear receptor that influences gene expression related to fatty acid metabolism and energy balance. This mechanism has been studied mainly in animals and cell models, not established as a safe human therapy.