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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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GI conditions that will keep you out of the U.S. armed services include ulcers, varices, fistulas, esophagitis, gastritis, congenital abnormalities, inflammatory bowel disease, enteritis, colitis, proctitis, duodenal diverticula, malabsorption syndromes, hepatitis, cirrhosis, cysts, abscesses, pancreatitis, polyps, certain hemorrhoids, splenomegaly, hernias, recent abdominal surgery, GI bypass or stomach stapling, and artificial GI openings.
Relative rate test, calibrating the molecular clock, and calculating divergence dates.
Using a vacuum hose and a test light to ground one cylinder at a time on a distributorless ignition ...
If necessary, connect a battery charger to the battery before starting the compression test. It is ...
A Mono-Diff test in which the presumptive well contains the patient's serum mixed with ...
Climate change affects organisms and ecosystems
Test-Cross Results from Mendel’s Experiments