Word: algal
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...fungi and doused them with TTC, the chemical began turning pink in only 15 to 20 minutes the time it usually takes active cells to react. As a double check, he placed some of the samples in containers of radioactively labeled carbon dioxide. When exposed to light, the algal cells immediately began taking up carbon dioxide, proof that photosynthesis was under way and that the plants were not dormant...
...reappeared only when man brought it back with him in the mud and dirt of his shoes. Palmellococcus' life was made all the more comfortable when man installed artificial lights in the cave, circulated the air with huge blowers and, most important of all, introduced a host of algal nutrients...
...recycle the precious oxygen in spaceships is a venerable idea, but it is far easier to accomplish in fiction than in fact. Many space-minded companies have added algologists to their staffs, but Boeing believes it is the first to keep a man alive for a full day on algal oxygen. The original air in McClure's tank would have become unbreathable in a short time. But as soon as the door closed, pumps started bubbling the air through the columns of illuminated algae...
...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...