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Comparative study of carbonic anhydrase activity in waters among different geological eco-environments of Yangtze River basin and its ecological significance

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Journal of Environmental Sciences 2018年第4期30卷 173-181页

作者： Sila Onesmus Nzung'a Weizhi Pan Taiming Shen Wei Li Xiaoqun Qin Chenwei Wang Liankai Zhang Longjiang Yu Institute of Resource Biology and Biotechnology Department of Biotechnology College of Life Science & Technology Huazhong Universityof Science & Technology Wuhan 430074 China Institute of Karst Geology Chinese Academy of Geological Sciences Guilin 541004 China Key Laboratory of Karst Dynamics Ministry of Land and Resources/Guangxi Zhuang Autonomous Region Guilin 541004 China teachers searvice commission-kenya P.O. Box Private Bag 00100 Nairobi Kenya

This study provides the presence of carbonic anhydrase（CA） activity in waters of the Yangtze River basin, China, as well as the correlation of CA activity with HCO-3 concentration and CO2 sink flux. Different degrees of CA activity could be detected in almost all of the water samples from different geological eco-environments in all four seasons. The CA activity of water samples from karst areas was significantly higher than from non-karst areas（PP3-concentration（r = 0.672, P2 sink flux（r = 0.602, P = 0.076） in karst areas. This suggests that CA in waters might have a promoting effect on carbon sinks for atmospheric CO2 in karst river basins. In conditions of similar geological type, higher CA activity was generally detected in water samples taken from areas that exhibited better eco-environments, implying that the CA activity index of waters could be used as an indicator for monitoring ecological environments and protection of river basins. These findings suggest that the role of CA in waters in the karst carbon sink potential of river basins is worthy of further in-depth studies.

关键词： Yangtze River basin Carbon sink Eco-environments Water body Carbonic anhydrase(CA)

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Instructional Planning Among teachers in Public Secondary Schools in kenya： Factors That Influence Performance in Business Studies

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Sociology Study 2014年第5期4卷 395-410页

作者： Paul A. Odundo Samson O. Gunga Boniface N. Ngaruiya University of Nairobi Kenya

Instructional planning gives teachers control over teaching/learning process and assures learning achievement. However, instructional planning and the linkage to learning achievement remain deficient in literature. This study assessed factors influencing teachers＇ decision to plan lessons, and effect of lesson planning on learning achievement. Primary data were obtained from 341 teachers of business studies. Bivariate analysis obtained cross-tabulations with Chisquare （χ2） and One-way Analysis of Variance （ANOVA）; while multivariate analysis obtained β coefficients and odds ratios. The study found that average workload accounted for the highest variance in the availability of lesson plans at 8.5%, suggesting that reducing workload is likely to increase the proportion of those planning their teaching by up to 8.5%, followed by professional experience （7.6%）, lesson plan inspection frequency （6.9%）, professional training （5.9%）, administrative duties （5.8%）, and teacher motivation （4.7%）. The adjusted regression model explained 46.5% of variance in availability of lesson plans. The study recommends： higher budgetary allocation for teachers＇ Service commission to hire more teachers; school boards to generate supplementary resources and hire trained teachers; regular spot checks on lesson plans; and appropriate motivation for teachers.

关键词： Instructional planning business studies

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The Ecological Importance and Influence of Land Use on Carbonic Anhydrase Activity of Waters in the Upstream Section of the Wujiang River Basin

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Journal of Resources and Ecology 2015年第4期6卷 230-236页

作者：潘伟志 SILA Onesmus Nzung'a 李为黄奇波申泰铭王晨玮覃小群余龙江华中科技大学生命科学与技术学院生物技术系资源生物学与生物技术研究所武汉430074 teachers Service commission-kenya 中国地质科学院岩溶地质研究所桂林541004 国土资源部/广西壮族自治区岩溶动力学重点实验室桂林541004

Thirty-four sampling sites for surface water and twenty-seven sampling sites for ground water in areas of different land use were selected in the Wujiang River Basin, upstream section in Guizhou Province, China. Carbonic anhydrase （CA） activity in surface and ground water was analyzed and compared. The results show that CA activity was detected in all surface and ground water samples. In general, average CA activity in surface and ground water was highest from samples in arbor lands, followed by shrub lands, shrub and grass lands, agricultural lands, and residential areas. The average CA activity in ground water from arbor lands, shrub lands, and shrub and grass lands was higher than that in surface water. Water CA activity was positively correlated with HCO3- concentration in surface water and ground water. These results imply that the contribution of CA in water to the karst carbon sink potential of river basins warrants further extensive and in-depth research.

关键词： Wujiang River basin land use type carbon sink carbonic anhydrase (CA) ground water surface water

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