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Author Question: Technician A says that wheel cylinder dust boots keep dust and moisture out of the cylinder bore. ... (Read 53 times) |
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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.
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.
More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.