以1 000 m L烧杯为容器,木葡糖醋杆菌在静置培养时,培养液体积为100 m L时,没有变异;增至300 m L时,发生变异,纤维素产量下降38.8%,培养液体积增至700 m L时,变异菌数量高达1.3×106 CFU/m L,纤维素产量下降76.3%;120 r/min振荡培...以1 000 m L烧杯为容器,木葡糖醋杆菌在静置培养时,培养液体积为100 m L时,没有变异;增至300 m L时,发生变异,纤维素产量下降38.8%,培养液体积增至700 m L时,变异菌数量高达1.3×106 CFU/m L,纤维素产量下降76.3%;120 r/min振荡培养更易发生变异,两种方式培养下的变异现象通过筛网使用而得到控制,从而提高了纤维素产量。展开更多
In this work,p-type Co3O4 decorated n-type ZnO(Co3O4/ZnO)nanocomposite was designed with the assistance of bacterial cellulose template.Phase composition,morphology and element distribution were investigated by XRD,SE...In this work,p-type Co3O4 decorated n-type ZnO(Co3O4/ZnO)nanocomposite was designed with the assistance of bacterial cellulose template.Phase composition,morphology and element distribution were investigated by XRD,SEM,HRTEM,EDS mapping and XPS.Volatile organic compounds(VOCs)sensing measurements indicated a noticeable improvement of response and decrease of working temperature for Co3O4/ZnO sensor,in comparison with pure ZnO,i.e.,the response towards 100 ppm acetone was 63.7(at a low working temperature of 180℃),which was 26 times higher than pure ZnO(response of 2.3 at 240℃).Excellent VOCs response characteristics could be ascribed to increased surface oxygen vacancy concentration(revealed by defect characterizations),catalytic activity of Co3O4 and the special p-n heterojunction structure,and bacterial cellulose provides a facile template for designing diverse functional heterojunctions for VOCs detection and other applications.展开更多
文摘以1 000 m L烧杯为容器,木葡糖醋杆菌在静置培养时,培养液体积为100 m L时,没有变异;增至300 m L时,发生变异,纤维素产量下降38.8%,培养液体积增至700 m L时,变异菌数量高达1.3×106 CFU/m L,纤维素产量下降76.3%;120 r/min振荡培养更易发生变异,两种方式培养下的变异现象通过筛网使用而得到控制,从而提高了纤维素产量。
文摘In this work,p-type Co3O4 decorated n-type ZnO(Co3O4/ZnO)nanocomposite was designed with the assistance of bacterial cellulose template.Phase composition,morphology and element distribution were investigated by XRD,SEM,HRTEM,EDS mapping and XPS.Volatile organic compounds(VOCs)sensing measurements indicated a noticeable improvement of response and decrease of working temperature for Co3O4/ZnO sensor,in comparison with pure ZnO,i.e.,the response towards 100 ppm acetone was 63.7(at a low working temperature of 180℃),which was 26 times higher than pure ZnO(response of 2.3 at 240℃).Excellent VOCs response characteristics could be ascribed to increased surface oxygen vacancy concentration(revealed by defect characterizations),catalytic activity of Co3O4 and the special p-n heterojunction structure,and bacterial cellulose provides a facile template for designing diverse functional heterojunctions for VOCs detection and other applications.
