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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]
Joint size can vary, [4] typically containing between 0.25 and 1 g (1 ⁄ 112 and 1 ⁄ 28 oz) net weight of cannabis. Tobacco is sometimes used in the rolling process. Tobacco is sometimes used in the rolling process.
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]
A laser extensometer is an extensometer capable of performing strain or elongation measurements on certain materials when they are subjected to loading in a tensile testing machine. The principle works by illuminating the specimen surface with a laser , the reflections from the specimen surface are then received by a CCD camera and processed by ...
The tetrahydrocannabinol within cannabis crosses the placenta, directly exposing the developing fetus to this chemical. Cannabis use in pregnancy is linked to increased risk of preterm delivery and lower birth weight, along with a higher likelihood of infants needing placement in the neonatal intensive care unit. [457]
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'.
Cannabis indica is an annual plant species in the family Cannabaceae [1] indigenous to the Hindu Kush mountains of Southern Asia. [2] The plant produces large amounts of tetrahydrocannabinol (THC) [ 3 ] and tetrahydrocannabivarin (THCV), with total cannabinoid levels being as high as 53.7%. [ 4 ]
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