Abstract
Publisher Summary Nocardia sp. strain 835A was shown to possess an ability to cause scissions of polymeric chains of natural rubber (NR), and the organism grew well on unvulcanized natural and synthetic isoprene rubber. Strain 835A had a high ability to colonize rubber pieces and microbial attack occurred only at points of direct contact with the colonies. A mutant strain Rc of Nocardia sp. 835A with a very high ability of disintegrating tire rubber was isolated. Disintegration of tread compounds from truck tires by strain Rc was found to be consistently influenced by the NR content. These experimental conditions gave a result with sufficient reproducibility in a relatively short time period, and the method enabled to examine various factors affecting microbial rubber degradation. It is found that the colonization of rubber pieces plays an important role in microbial decomposition of NR, and describes the unique characteristic feature of growth of the rubber-degrading organism on rubber pieces in this chapter.
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