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Did you know?

The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

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A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.

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For high blood pressure (hypertension), a new class of drug, called a vasopeptidase blocker (inhibitor), has been developed. It decreases blood pressure by simultaneously dilating the peripheral arteries and increasing the body's loss of salt.

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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.

Leaf Cell Leaf Cell
Cell culture in a Petri dish Cell culture in a Petri dish
Because of the hazards of a vacuum, astronauts must wear a pressurized space suit while outside thei Because of the hazards of a vacuum, astronauts must wear a pressurized space suit while outside thei
Animal Cell Key Animal Cell Key
Interaction between a CD8+ T cell and its target. Interaction between a CD8+ T cell and its target.
A transmission electron micrograph of cytokinesis in a cross section of a dividing cell A transmission electron micrograph of cytokinesis in a cross section of a dividing cell
Video: Introduction to Sleep Apnea

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