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  2. Cannabis drug testing - Wikipedia

    en.wikipedia.org/wiki/Cannabis_drug_testing

    THC, the main psychoactive component of cannabis, may only be detectable in saliva and oral fluid for 2–24 hours in most cases. [8] [9] The main metabolite excreted in the urine is 11-Nor-9-carboxy-THC, also known as THC-COOH. Most cannabis drug tests yield a positive result when the concentration of THC-COOH in urine exceeds 50 ng/mL. [10]

  3. Long-term effects of cannabis - Wikipedia

    en.wikipedia.org/wiki/Long-term_effects_of_cannabis

    Gordon and colleagues in a 2013 literature review said: "Unfortunately, methodological limitations in many of the reviewed studies, including selection bias, small sample size, limited generalizability, and lack of adjustment for tobacco smoking, may limit the ability to attribute cancer risk solely to marijuana use."

  4. Daily marijuana use linked to increased risk of deadly head ...

    www.aol.com/news/daily-marijuana-linked...

    The analysis showed that people with cannabis use disorder were about 2.5 times more likely to develop an oral cancer; nearly five times more likely to develop oropharyngeal cancer, which is ...

  5. Cannabinoid - Wikipedia

    en.wikipedia.org/wiki/Cannabinoid

    Strains used in medicine are often bred for high CBD content, and strains used for recreational purposes are usually bred for high THC content or for a specific chemical balance. Quantitative analysis of a plant's cannabinoid profile is often determined by gas chromatography (GC), or more reliably by gas chromatography combined with mass ...

  6. Cannabis sativa - Wikipedia

    en.wikipedia.org/wiki/Cannabis_sativa

    Cannabis sativa is an annual herbaceous flowering plant. The species was first classified by Carl Linnaeus in 1753. [ 1 ] The specific epithet sativa means 'cultivated'.

  7. United States Geological Survey - Wikipedia

    en.wikipedia.org/wiki/United_States_Geological...

    Georeferenced map images are available from the USGS as digital raster graphics (DRGs) in addition to digital data sets based on USGS maps, notably digital line graphs (DLGs) and digital elevation models (DEMs). In 2015, the USGS unveiled the topoView website, a new way to view their entire digitized collection of over 178,000 maps from 1884 to ...

  8. Stream gauge - Wikipedia

    en.wikipedia.org/wiki/Stream_gauge

    The first routine measurements of river flow in England began on the Thames and Lea in the 1880s, [2] and in Scotland on the River Garry in 1913. [3] The national gauging station network was established in its current form by the early 1970s and consists of approximately 1500 flow measurement stations supplemented by a variable number of temporary monitoring sites. [2]

  9. AK-47 (cannabis) - Wikipedia

    en.wikipedia.org/wiki/AK-47_(cannabis)

    The strain has been combined with the White Widow strain to produce White Russian cannabis, a plant with "a pleasantly sweet aroma" and a "long lasting effect". [17] The Chronic strain of cannabis is a cross of AK-47 with Northern Lights and Skunk #1. [16] The Cherry AK phenotype is occasionally produced by AK-47 plants. [14]