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7-Methylxanthine ( 7-MX ), also known as heteroxanthine, is an active metabolite of caffeine (1,3,7-trimethylxanthine) and theobromine (3,7-dimethylxanthine). [ 1][ 2] It is a non-selective antagonist of the adenosine receptors. [ 1][ 2] The compound may slow the progression of myopia (nearsightedness). [ 1][ 2] It is under investigation for ...
Infobox references. 1,3,7-Trimethyluric acid, also referred to as trimethyluric acid and 8-oxy-caffeine, is a purine alkaloid that is produced in some plants and occurs as a minor metabolite of caffeine in humans. [ 1] The enzymes that metabolize caffeine into 1,3,7-trimethyluric acid in humans include CYP1A2, CYP2E1, CYP2C8, CYP2C9, and CYP3A4 ...
Radar beacon (short: racon) is – according to article 1.103 of the International Telecommunication Union's (ITU) ITU Radio Regulations (RR) [ 1] – defined as "A transmitter-receiver associated with a fixed navigational mark which, when triggered by a radar, automatically returns a distinctive signal which can appear on the display of the ...
When the numbers "3-7-77" were painted on a tent or cabin, it was a warning that the occupants could face vigilantism if they did not leave the area. In 1917, union organizer Frank Little was lynched, and a note pinned to his body read, "Others take notice, first and last warning, 3-7-77." [ 1]
When To Not Use a Tourniquet. A tourniquet is an emergency device used to stop life-threatening bleeding that cannot otherwise be stopped. You should avoid using a tourniquet if: You can stop the ...
Identification, friend or foe ( IFF) is a combat identification system designed for command and control. It uses a transponder that listens for an interrogation signal and then sends a response that identifies the broadcaster. IFF systems usually use radar frequencies, but other electromagnetic frequencies, radio or infrared, may be used. [ 1]
And together, we can take them back if we want to,” he said. “Sustained attention is at the heart of all human achievement,” said Hari, noting that no athlete is bringing their phone to ...
In the United States, response codes are used to describe a mode of response for an emergency unit responding to a call. They generally vary but often have three basic tiers: Code 3: Respond to the call using lights and sirens. Code 2: Respond to the call with emergency lights, but without sirens. Alternatively, sirens may be used if necessary ...