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The pulA gene enconding a thermostable pullulanase of 844 amino acids was cloned by PCR amplification from the genomic DNA of Thermotoga maritima MSB8. We successfully expressed the pulA gene in a protease-deficient strain Bacillus subtilis WB600, and the expressed pullulanase was secreted into the culture broth. Preliminary results showed that the pullulanase exhibited optimal activity at 90°C, and...
Soil contamination with Cd is of concern in many countries throughout the world. Extraction of metals from contaminated soils using high-biomass, metal accumulating Populus has been proposed as a low cost, gentle remediation strategy. In a pot experiment, the phytoaccumulation potential for Cd of 3 poplar species (Populus cathayana, P. prezwaskii, P. yunnanensis) were evaluated on three moderately...
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