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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 ...
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]
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 ...
DEFCON. The defense readiness condition ( DEFCON) is an alert state used by the United States Armed Forces. [ 1][ 2] For security reasons, the US military does not announce a DEFCON level to the public. [ 1] The DEFCON system was developed by the Joint Chiefs of Staff (JCS) and unified and specified combatant commands. [ 3]
The Ronald Reagan Ballistic Missile Defense Test Site, commonly referred to as the Reagan Test Site (formerly Kwajalein Missile Range ), is a missile test range in Marshall Islands ( Pacific Ocean ). It covers about 750,000 square miles (1,900,000 km 2) and includes rocket launch sites at the Kwajalein Atoll (on multiple islands), Wake Island ...