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Studies of the biodegradation of various types of plastics such as high-densitypolyethylene (HDPE), low density polyethylene (LDPE), polypropylene (PP) and polystyrene (PS) in natural soils revealed that some soil microorganisms including fungi and bacteria showed a specific metabolic capacity to assimilate these plastics as carbon and energy sources for their growth. (In addition, For example, Hence, However), some fungi (Penicillium simplicissimum) degraded the high density polyethylene (HDPE) of a molecular weight of up to 2800 (Yamada-Onodera, 2001). The soil thermophilic bacterium Brevibacillus borstelensis strain 707 assimilates LDPE as a carbon source (Hadad et al., 2005). The biodegradation of plastics is hypothesized to be accelerated under an open dump environment, that differs from the anaerobic condition of a landfill. With the available methane and oxygen in between an open dump mass, methanotrophic bacteria are expected to be one of the species present.
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