Word: rifampicin
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...agreed to the new test, primarily because of the innovative mechanisms for tracking the bacteria. In addition to turning blue, the bugs have been engineered to resist the antibiotic rifampicin -- a combination of properties that makes it possible to detect the presence of a single Pseudomonas among the billion or so microorganisms that may exist in a thimbleful of soil. Explains Margaret Mellon, manager of the National Wildlife Federation's biotechnology project: "This system is an important advance. In and of itself, it doesn't answer questions about whether bioengineered organisms are in general more or less safe than their...
...Cambridge, Mass., firm, of Rhizobium bacteria altered to boost their ability to fix nitrogen in the soil. In one of the California ice- minus tests, however, scientists have been able to monitor the spread of anti- icing bacteria on potato plants. The marker system in this case was rifampicin resistance, less sensitive than Monsanto's multiple indicator but still able to detect the presence of as few as 100 bacteria in a handful of leaves. The bacteria were successful as well as trackable: ice-minus appears to reduce frost damage early in the growing season...
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