Did you know?
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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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.
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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
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Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
Distributions of two barnacle species within the intertidal zone
The Black Bee-eater (Merops gularis) is a species of bird in the Meropidae family.
Flowchart to determine if a species is autotroph, heterotroph, or a subtype
The human olfactory system.
A wide variety of pathogens may live on or in the human body
Conventions commonly encountered in human pedigrees