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In 1864, the first barbiturate (barbituric acid) was synthesized.

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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.

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Drug-induced pharmacodynamic effects manifested in older adults include drug-induced renal toxicity, which can be a major factor when these adults are experiencing other kidney problems.

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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.

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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

A wastegate is used on the first-generation Duramax diesel to control maximum boost pressure. A wastegate is used on the first-generation Duramax diesel to control maximum boost pressure.
Schematic of a typical electronic throttle control (ETC) system. Note that terminal #5 is always ... Schematic of a typical electronic throttle control (ETC) system. Note that terminal #5 is always ...
The major human endocrine glands and their central nervous system control centers The major human endocrine glands and their central nervous system control centers
Biological control pits one organism against another Biological control pits one organism against another
Crime Control in America: What Works?, 4th Edition Crime Control in America: What Works?, 4th Edition
Control of Respiration Control of Respiration
Video: How to find out if a population is evolving?

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