The microbial flora in bamboo stump at different decomposition degree was studied. The results showed that the logarithmic values of bacterial concentrations ranged from 5.477 to 7.380; the logarithmic values of funga...The microbial flora in bamboo stump at different decomposition degree was studied. The results showed that the logarithmic values of bacterial concentrations ranged from 5.477 to 7.380; the logarithmic values of fungal concentrations ranged from 5.301 to 6.903; the logarithmic values of actinomycetes concentrations ranged from 5.740 to 7.000; the logarithmic values of cellulose-degrading bacterial concentrations ranged from 4.301 to 6.447; the logarithmic values of lignin-degrading bacterial concentrations ranged from 4.415 to 6.799. During the decomposition of bamboo stump, all the microorganisms grew rapidly at the initial stage; the logarithmic values of bacterial, fungal and actinomycetes concentrations changed constantly at the middle stage; and the logarithmic values were all higher at the late stage.There were assistance and competition among microorganism to certain extent. Understanding the decomposition rule of bamboo stump before its cutting down can provide some reference for the future decomposition of bamboo stump, and provide basic data for the isolation of microorganisms from bamboo stump at the species level.展开更多
In order to understand the behavior of ligninolytic enzyme production by white rot fungi Phanerochaete chrysosporium, study on time courses and a mathematical model for the production of lignin peroxidase (LiP) and ma...In order to understand the behavior of ligninolytic enzyme production by white rot fungi Phanerochaete chrysosporium, study on time courses and a mathematical model for the production of lignin peroxidase (LiP) and manganese peroxidase (MnP) of the fungi was undertaken. Based on the Monod-Jacob operon model, the ligninolytic enzyme would be synthesized in the absence of a related repressor. The repressor is assumed to be active in the presence of ammonia nitrogen, and as combined as co-repressor, it causes the inhibition of enzyme synthesis. The model can explain the mechanism of extracellular ligninolytic enzyme production by white rot fungi. The results,as predicted by the model, correspond closely to those observed in experimental studies. In addition, some light is also shed on unmeasured variables, such as the concentrations of repressor and mRNA that are related to the enzyme synthesis.展开更多
基金Supported by Youth Innovation Fund of Hunan Academy of Forestry(2013LQJ09)~~
文摘The microbial flora in bamboo stump at different decomposition degree was studied. The results showed that the logarithmic values of bacterial concentrations ranged from 5.477 to 7.380; the logarithmic values of fungal concentrations ranged from 5.301 to 6.903; the logarithmic values of actinomycetes concentrations ranged from 5.740 to 7.000; the logarithmic values of cellulose-degrading bacterial concentrations ranged from 4.301 to 6.447; the logarithmic values of lignin-degrading bacterial concentrations ranged from 4.415 to 6.799. During the decomposition of bamboo stump, all the microorganisms grew rapidly at the initial stage; the logarithmic values of bacterial, fungal and actinomycetes concentrations changed constantly at the middle stage; and the logarithmic values were all higher at the late stage.There were assistance and competition among microorganism to certain extent. Understanding the decomposition rule of bamboo stump before its cutting down can provide some reference for the future decomposition of bamboo stump, and provide basic data for the isolation of microorganisms from bamboo stump at the species level.
基金Supported by the National Natural Science Foundation of China (No. 29976038).
文摘In order to understand the behavior of ligninolytic enzyme production by white rot fungi Phanerochaete chrysosporium, study on time courses and a mathematical model for the production of lignin peroxidase (LiP) and manganese peroxidase (MnP) of the fungi was undertaken. Based on the Monod-Jacob operon model, the ligninolytic enzyme would be synthesized in the absence of a related repressor. The repressor is assumed to be active in the presence of ammonia nitrogen, and as combined as co-repressor, it causes the inhibition of enzyme synthesis. The model can explain the mechanism of extracellular ligninolytic enzyme production by white rot fungi. The results,as predicted by the model, correspond closely to those observed in experimental studies. In addition, some light is also shed on unmeasured variables, such as the concentrations of repressor and mRNA that are related to the enzyme synthesis.
