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Extra resources for [Magazine] Scientific American. 1998. Vol. 278. No 3
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Other times, genetic mutations, which occur readily in bacteria, will spontaneously produce a new resistance trait or will strengthen an c PLASMID existing one. And frequently, bacteria will gain a defense ANTIBIOTIC against an antibiotic by taking up resistance genes from ANTIBIOTICother bacterial cells in the viALTERING BACTERIAL cinity. Indeed, the exchange ANTIBIOTIC ENZYME CELL of genes is so pervasive that the entire bacterial world can CHROMOSOME be thought of as one huge multicellular organism in which the cells interchange their genes with ease.
Second, discrepancies between the shapes or dimensions of the subject and the graphical character can lead to problems. If, for example, the subject was recorded touching a real table, the hands Copyright 1998 Scientific American, Inc. Animating Human Motion Keyframing and Motion Capture B of a shorter graphical character might appear sunk into the table. Finally, the current technology makes it difficult to record certain movements. Magnetic systems often require the subject to be connected to a computer by cables, restricting the range of motion.
As a start, drugs support growth. Clearly, though, trivial. Denis E. Corpet of the National this long-term exposure to low doses is Institute for Agricultural Research in farmers should be helped to find inexthe perfect formula for selecting increas- Toulouse, France, showed that when hu- pensive alternatives for encouraging aning numbers of resistant bacteria in the man volunteers went on a diet consist- imal growth and protecting fruit trees. treated animals—which may then pass ing only of bacteria-free foods, the num- Improved hygiene, for instance, could the microbes to caretakers and, more ber of resistant bacteria in their feces go a long way to enhancing livestock broadly, to people who prepare and decreased 1,000-fold.
[Magazine] Scientific American. 1998. Vol. 278. No 3
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