Read or Download [Magazine] Scientific American. Vol. 274. No 4 PDF
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Extra resources for [Magazine] Scientific American. Vol. 274. No 4
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Indeed, giant prokaryotes living today have a highly convoluted outer membrane, probably a prerequisite of their enormous girth. Thus, one eukaryotic property—large size—can be accounted for simply enough. Natural selection is likely to favor expansion over division because deep folds would increase the cell’s ability to obtain food by creating partially confined areas—narrow inlets along the rugged FLAGELLUM LYSOSOME ENDOPLASMIC RETICULUM NUCLEAR ENVELOPE ACTIN FIBERS MICROTUBULES The Birth of Complex Cells GOLGI APPARATUS ROBERTO OSTI EMERGENCE OF SKELETAL ELEMENTS made up of fibers and microtubules lent internal support to the growing cell and enabled it to flex the outer membrane and move material about.
Cheng and N. J. Woolf in Nature, Vol. 322, pages 341–343; July 24, 1986. Use of a 16 Meter Telescope to Detect Earthlike Planets. J. Roger P. Angel in The Next Generation Space Telescope. Edited by P. Bely and C. J. Burrows. Space Telescope Science Institute, Baltimore, 1990. Life in the Universe. Special issue of Scientific American, Vol. 271, No. 4; October 1994. 66 Scientific American April 1996 Copyright 1996 Scientific American, Inc. Searching for Life on Other Planets Smart Rooms In creating computer systems that can identify people and interpret their actions, researchers have come one step closer to building helpful home and work environments by Alex P.
What kind of telescope do we need to locate Earth-like planets and pick up their infrared emissions? Some of today’s ground-based telescopes can detect the strong infrared radiation emanating from stars. But the heat emitted by our atmosphere and by the telescope itself would completely swamp any sign of a planet. Even Antarctica is not nearly cold enough to enable us to pick out such a faint image: the telescope must be cooled to at least minus 225 degrees Celsius (about 50 kelvins). More troublesome, radiation passing through Earth’s atmosphere is imprinted with exactly the features of ozone, carbon dioxide and water we hope to find on another planet.