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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]
Oscar Krisen Buros (1905-1978) was a professor of measurement and statistics in the Rutgers School of Education when he published a comprehensive review of psychological tests in 1938, called the Mental Measurements Yearbook (MMY). [3] [4] It has been updated regularly ever since, with 19 subsequent editions through 2017.
This is a list of rivers in the continental United States by average discharge (streamflow) in cubic feet per second. All rivers with average discharge more than 15,000 cubic feet per second are listed.
[29] [30] In recent years, budget constraints have forced the USGS to rely on donations of time by civilian volunteers in an attempt to update its 7.5-minute topographic map series, and USGS stated outright in 2000 that the program was to be phased out in favor of The National Map [31] (not to be confused with the National Atlas of the United ...
The USGS headquarters in Reston, VA. Today, the United States Geological Survey Library's users have access to over 1.7 million items: over 980,000 books and journals, over 600,000 maps, over 8,000 electronic media items (DVDs, CDs), and subscribes to over 113,000 electronic journal titles and eBooks.
Each strain of marijuana is unique and its effect on individuals will vary. Indica . Results in a relaxing, chill high (common mnemonic device is indica for in-da-couch)
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]
At least 592 cases were reported after the alert was first raised by Congo's health ministry on Oct. 29. The ministry said the disease had a fatality rate of 6.25%.