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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Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
A colour print of platypuses from 1863
Palm print
In 2005 historian Angela Lakwete used this print as the cover of Inventing the C
Timothy O'Sullivan (negative) and Alexander Gardner (print), A Harvest of Death, Gettysburg, ...