ABSTRACT
In this study, six bacterial community structures were analyzed from the Dunde ice core (9.5-m-long) using 16S rRNA gene cloning library technology. Compared to the Muztagata mountain ice core (37-m-long), the Dunde ice core has different dominant community structures, with five genus-related groups Blastococcus sp./Propionibacterium, Cryobacterium-related., Flavobacterium sp., Pedobacter sp., and Polaromas sp. that are frequently found in the six tested ice layers from 1990 to 2000. Live and total microbial density patterns were examined and related to the dynamics of physical-chemical parameters, mineral particle concentrations, and stable isotopic ratios in the precipitations collected from both Muztagata and Dunde ice cores. The Muztagata ice core revealed seasonal response patterns for both live and total cell density, with high cell density occurring in the warming spring and summer months indicated by the proxy value of the stable isotopic ratios. Seasonal analysis of live cell density for the Dunde ice core was not successful due to the limitations of sampling resolution. Both ice cores showed that the cell density peaks were frequently associated with high concentrations of particles. A comparison of microbial communities in the Dunde and Muztagata glaciers showed that similar taxonomic members exist in the related ice cores, but the composition of the prevalent genus-related groups is largely different between the two geographically different glaciers. This indicates that the micro-biogeography associated with geographic differences was mainly influenced by a few dominant taxonomic groups.
ABSTRACT
OBJECTIVE: To study the prevalence and characteristics of blood pressure (BP) among children and adolescents at normal weight but with abdominal obesity. METHODS: Using data from the 'Student physical fitness and health surveillance 2010 project' in Shandong province, a total of 38 816 students aged 7-17 years were selected to participate in this study. Stature, body weight, waist circumference(WC), systolic blood pressure(SBP)and diastolic blood pressure(DBP) of these subjects were measured. Body weight status and abdominal obesity were defined by body mass index (BMI) and WC, respectively. RESULTS: In total, the proportions of thinness, normal weight, overweight and obesity defined by BMI were 5.37%, 72.47%, 12.92% and 9.24% respectively. 5.86% of the children and adolescents with normal weight had abdominal obesity, with normal weighted girls (7.19%) having higher prevalence of abdominal obesity than boys(4.33%)(P < 0.01). The Z-scores of SBP and DBP for both boys and girls were all significantly higher in the normal weight but with abdominal obesity groups than in both normal weight and WC groups (P < 0.01). CONCLUSION: Children and adolescents under normal weight but with abdominal obesity had higher BP level need to be identified and considered as high-risk individuals. Related intervention programs should also be targeted to this population.
