Word: viral
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Dates: during 1960-1969
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...Viral Assistance. Although the gene has long been recognized as the basic unit of heredity, it has been only 26 years since molecular biologists learned that the gene is actually composed of deoxyribonucleic acid (DNA) a complex molecule that forms the chromosomes in every living cell. The DNA molecule is shaped like a spiral staircase-a double helix connected by steps, or links. Each of the thousands of links consists of a pair of mutually attracting chemical bases. Although only four different kinds of such bases are found in DNA, they can be arranged along the helix in an enormous...
...slowly, a process that causes two chemically complementary strands of DNA to combine in a double helix. But the two strands were complementary only along the segments that had been parts of the original bacterial lac gene. Thus, only these segments could combine (Step 2). The remainder of the viral strands, unable to find properly matched partners, were left dangling. After these stray tails were chemically dissolved, only the single gene remained (Step...
...since the two types of viral DNA were not oriented in complementary pairs, the viral DNA remained as loose, single strands...
Similar hemorrhagic epidemics appeared in Manila and Bangkok in the mid '50s. Singapore was hit in 1960, and Bangkok has undergone another siege this summer. The current disease is a viral variant of dengue (pronounced dengghee), a less virulent malady that has some different symptoms (aching muscles and joints, no hemorrhaging). The affliction is sometimes called "dandy fever"-for the peculiar mincing gait of those whose joints have been affected...
...example, found it in only one of 1,000 blood samples from healthy Americans, many of whom may have had a mild case of hepatitis without knowing it. The antigen was found in the blood of 30% of mongolism victims living in large institutions, which are often swept by viral epidemics. It is common among leukemia patients who presumably get it through transfusions. It was also discovered in 9% of patients with the "lion face" form of leprosy...