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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.

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Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).

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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.

The Respiratory Tract The Respiratory Tract
Nephrolithiasis. Stones, or calculi, may form in several areas within the urinary tract. When they f Nephrolithiasis. Stones, or calculi, may form in several areas within the urinary tract. When they f
Structure of the E. coli Tus protein, complexed with double-stranded DNA Structure of the E. coli Tus protein, complexed with double-stranded DNA
Coupling of transcription to translation in E. coli via the interaction between NusE and G Coupling of transcription to translation in E. coli via the interaction between NusE and G
An ulcer is created when the mucosal lining of the GI tract erodes or breaks An ulcer is created when the mucosal lining of the GI tract erodes or breaks
Bidirectional replication of the E. coli chromosome Bidirectional replication of the E. coli chromosome
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