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Daniel O. Onunga Anastasiah N. Ngigi Aggrey Osogo Francis Orata Zachary M. Getenga 《Journal of environmental science and health. Part. B》2013,48(6):387-397
Carbofuran (2,3-dihydro-2,2-dimethylbenzofuran-7-yl methylcarbamate) has been used within the Nzoia River Basin (NRB), especially in Bunyala Rice Irrigation Schemes, in Kenya for the control of pests. In this study, the capacity of native bacteria to degrade carbofuran in soils from NRB was investigated. A gram positive, rod-shaped bacteria capable of degrading carbofuran was isolated through liquid cultures with carbofuran as the only carbon and nitrogen source. The isolate degraded 98% of 100-μg mL?1 carbofuran within 10 days with the formation of carbofuran phenol as the only detectable metabolite. The degradation of carbofuran was followed by measuring its residues in liquid cultures using high performance liquid chromatography (HPLC). Physical and morphological characteristics as well as molecular characterization confirmed the bacterial isolate to be a member of Bacillus species. The results indicate that this strain of Bacillus sp. could be considered as Bacillus cereus or Bacillus thuringiensis with a bootstrap value of 100% similar to the 16S rRNA gene sequences. The biodegradation capability of the native strains in this study indicates that they have great potential for application in bioremediation of carbofuran-contaminated soil sites. 相似文献
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Saunak Shukla Reza Daneshazarian Aggrey Mwesigye Wey H. Leong 《International Journal of Green Energy》2020,17(2):137-148
ABSTRACTRadiant floor systems have the potential to reduce energy consumption and the carbon footprint of buildings. This study analyzed a novel radiant panel configuration comprising a metal plate with small spikes that can be pressed into cement board or wood. The behavior of this configuration was simulated for different materials for the metal plate, spike dimensions, and varying spacing between spikes. An annual energy simulation model compared the radiant panel configuration with the traditional concrete-based system. Simulations were run under heating dominant, cooling dominant, and neutral conditions; significant cost savings and greenhouse gas emission reduction were seen across all scenarios. 相似文献
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Henry Travers Lucy J. Archer Geoffrey Mwedde Dilys Roe Julia Baker Andrew J. Plumptre Aggrey Rwetsiba E.J. Milner-Gulland 《Conservation biology》2019,33(6):1296-1306
In conservation understanding the drivers of behavior and developing robust interventions to promote behavioral change is challenging and requires a multifaceted approach. This is particularly true for efforts to address illegal wildlife use, where pervasive—and sometimes simplistic—narratives often obscure complex realities. We used an indirect questioning approach, the unmatched count technique, to investigate the drivers and prevalence of wildlife crime in communities surrounding 2 national parks in Uganda and combined scenario interviews and a choice experiment to predict the performance of potential interventions designed to tackle these crimes. Although poverty is often assumed to be a key driver of wildlife crime, we found that better-off households and those subject to human–wildlife conflict and those that do not receive any benefits from the parks’ tourism revenue sharing were more likely to be involved in certain types of wildlife crime, especially illegal hunting. The interventions predicted to have the greatest impact on reducing local participation in wildlife crime were those that directly addressed the drivers including, mitigating damage caused by wildlife and generating financial benefits for park-adjacent households. Our triangulated approach provided insights into complex and hard-to-access behaviors and highlighted the importance of going beyond single-driver narratives. 相似文献
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Aggrey Ochieng Adimo John Bosco Njoroge Leaven Claessens Leonard S. Wamocho 《Mitigation and Adaptation Strategies for Global Change》2012,17(2):153-171
Climate variability and change mitigation and adaptation policies need to prioritize land users needs at local level because
it is at this level that impact is felt most. In order to address the challenge of socio-economic and unique regional geographical
setting, a customized methodological framework was developed for application in assessment of climate change vulnerability
perception and adaptation options around the East African region. Indicators of climate change and variability most appropriate
for the region were derived from focused discussions involving key informants in various sectors of the economy drawn from
three East African countries. Using these indicators, a structured questionnaire was developed from which surveys and interviews
were done on selected sample of target population of farming communities in the Mt. Kenya region. The key highlights of the
questionnaire were vulnerability and adaptation. Data obtained from respondents was standardized and subjected to multivariate
and ANOVA analysis. Based on principle component analysis (PCA), two main vulnerability categories were identified namely
the social and the bio-physical vulnerability indicators. Analysis of variance using Kruskal-Wallis test showed significant
statistical variation (P ≤ 0.05) in the perceived vulnerability across the spatial distribution of the 198 respondents. Three insights were distinguished
and were discernible by agro-ecological zones. Different vulnerability profiles and adaptive capacity profiles were generated
demonstrating the need for prioritizing adaptation and mitigation efforts at local level. There was a high correlation between
the bio-physical and social factor/livelihood variables that were assessed. 相似文献
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