Word: sunlights
(lookup in dictionary)
(lookup stats)
Dates: during 1960-1969
Sort By: most recent first
(reverse)
...green plants manufacture food and store energy by absorbing carbon dioxide, water and sunlight? Scientists have been piecing together the answer for years, sure that when they learn the last detail of the complicated process they will be closer than ever before to understanding the secret heart of nature. For life itself-in whatever form it appears on earth-steadily expends the solar energy stored during the intricate chemical reaction that scientists call photosynthesis...
...isolated chloroplasts from spinach leaves, Dr. Arnon and his colleagues found that they could study the role of light without being bothered by the other chemical processes that take place in the normal plant cell. After tedious experiment, they decided that when green plant pigment (chlorophyll) is struck by sunlight its molecules become so excited that they shake loose some electrons. And those electrons eventually help to form some of the basic chemical substances necessary for photosynthesis...
...world, other researchers are designing experiments to exploit this new knowledge of photosynthesis. Drs. Arnon and Tagawa have already been able to recognize a striking similarity between photosynthesis in plants and chemical processes that are carried on by certain bacteria that live in the soil, cut off from both sunlight and oxygen. The discovery, says Dr. Arnon, demonstrates "the beautiful biochemical unity of nature...
Furthermore, La Notte outstrips Antonioni's last work, L'Avventura, largely because of its quicker pace and more startling scene shifts. One defect of L'Avventura was the sameness of the light that infused each scene. Not so with La Notte: first the dazzling glare of sunlight reflected from the steel and glass structures of the city, then the artificial whiteness of a hospital room, then the shadows by a wall, a continuously changing field of intensities that keep one's attention riveted on the screen...
...across. Then pumps will draw out the air, creating a hard vacuum just like that existing in space 250 miles high. The chamber's walls can be cooled to match the deathly cold of space, and a battery of arc lamps above quartz windows simulates the fierce unscreened sunlight. If a satellite survives this torture, it will probably work in actual space...