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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).

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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.

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Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.

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Amphetamine poisoning can cause intravascular coagulation, circulatory collapse, rhabdomyolysis, ischemic colitis, acute psychosis, hyperthermia, respiratory distress syndrome, and pericarditis.

Cyanobacteria of the (a) genus Synechococcus form (b) mats that line hot springs around the world. Cyanobacteria of the (a) genus Synechococcus form (b) mats that line hot springs around the world.
The Meselson-Stahl Experiment p1 The Meselson-Stahl Experiment p1
Some Ford metal line connections use springlocks and O-rings. Some Ford metal line connections use springlocks and O-rings.
Landsteiner's experiment demonstrating the exquisite specificity of the immune system. Landsteiner's experiment demonstrating the exquisite specificity of the immune system.
Tai chi walk along straight line. From tai chi stance, shift weight to the back leg and turn the ... Tai chi walk along straight line. From tai chi stance, shift weight to the back leg and turn the ...
Bright-Line Spectra of Hydrogen and Helium Bright-Line Spectra of Hydrogen and Helium
Video: Photosynthesis overview Animation

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