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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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).
People about to have surgery must tell their health care providers about all supplements they take.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.