Word: algal
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Dates: during 1953-1953
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...algal culture has its drawbacks: it cannot be grown effectively in open ponds or tanks, where it quickly runs out of carbon dioxide or falls prey to microscopic predators. The best way to handle it is to circulate it rapidly through wide, flat tubes of thin plastic. The cells utilize sunlight most efficiently when they are exposed to its full intensity for only a fraction of a second at a time. So the flow of the culture must be turbulent, bringing the cells to the surface for a short time, then carrying them down into shaded depths. The "crop...