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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

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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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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.

Sites of mtDNA mutations in certain human diseases Sites of mtDNA mutations in certain human diseases
Living systems such as the human body consist of closely interrelated elements Living systems such as the human body consist of closely interrelated elements
Trace Elements of the Human Body Trace Elements of the Human Body
The first pioneer species arrived less than a decade after the eruption. The first pioneer species arrived less than a decade after the eruption.
Physical distance versus recombination distance on human male and female chromosome 19 Physical distance versus recombination distance on human male and female chromosome 19
Video: Membrane Protein and Facilitated Transport (Passive Vs Active)

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