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Articles by Cao Jing
Total Records ( 2 ) for Cao Jing
  Jia Guo-Mei , Zhang Pei-Dong , Wang Gang , Cao Jing , Han Jing-Cheng and Huang Ying-Ping
  The changes of microbial biomass carbon (MBC) and nitrogen (MBN) and microbial community in the topsoil of the abandoned agricultural land on the semi-arid Loess Plateau in China during the natural succession were evaluated to understand the relationship between microbial community and soil properties. MBC and MBN were measured using fumigation extraction, and microbial community was analyzed by the method of fatty acid methyl ester (FAME). The contents of organic C, total N, MBC, MBN, total FAME, fungal FAME, bacterial FAME and Gram-negative bacterial FAME at the natural succession sites were higher than those of the agricultural land, but lower than those of the natural vegetation sites. The MBC, MBN and total FAME were closely correlated with organic C and total N. Furthermore, organic C and total N were found to be positively correlated with fungal FAME, bacterial FAME, fungal/bacterial and Gram-negative bacterial FAME. Natural succession would be useful for improving soil microbial properties and might be an important alternative for sustaining soil quality on the semi-arid Loess Plateau in China.
  ZHAO Zhi-jun , WANG Rui-rui , CAO Jing and PEI Lan-ying
  Significance of plasticity in energy budget and development of animals in response to variations of food availability was examined in weaned male KM mice that were acclimated to a random food deprivation (FD) for 4 weeks, and then refed ad libtum for another 4 weeks. Food intake was determined using a food balance method. Basal metabolic rate (BMR) was measured using a closed-circuit respirometer. Food intake increased significantly on ad libitum day in FD mice, but BMR and activity decreased. FD mice also had a significantly lower weight in carcass and gonadal gland than controls after 4 weeks of FD. All the above parameters recovered to the levels of controls after 4 weeks of ad libitum refeeding, indicating a significant plasticity. In addition, the group difference in fat content was not significant. These results suggest that animals can compensate for unpredictable lower food availability by an energetic strategy, including an increase in food intake and a decrease in energy expenditure associated with BMR and activity, and decrease in carcass mass thus reduced energy spent on maintenance, but not including the changes in body fat. Development is affected significantly by lower food availability but recovers to the normal level when food is plentiful. Finally, plasticity in energetic budget and development play important roles in animals under unpredictable variations of food availability.
 
 
 
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