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Enzyme Inhibition Rate Method for Rapid Detection of Organophosphorus and Carbamate Pesticides in Cowpea 被引量:4
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作者 Mai Changqing Chen Sheng Chen Yan 《Plant Diseases and Pests》 CAS 2017年第4期30-32,共3页
[Objectives ] The paper was to explore enzyme inhibition rate method for rapid detection of organophosphorus and carbamate pesticides in cowpea. [ Methods ] Acetylcholinesterase (ACHE) was added to cowpea extract, t... [Objectives ] The paper was to explore enzyme inhibition rate method for rapid detection of organophosphorus and carbamate pesticides in cowpea. [ Methods ] Acetylcholinesterase (ACHE) was added to cowpea extract, to determine the inhibition rate of extract against enzyme. The influences of different sampiing methods and sampling parts on detection results were compared. [ Results] The positive rate of standard sampling was 18.18% higher than that of non-stand- ard sampling, and the positive rate of samples collected from cowpea tail was 16.67% higher than that collected from other parts. [ Condmions] Enzyme inhibi- tion rate method is suitable for rapid detection of organophosphorus and carbamate pesticides in cowpea. 展开更多
关键词 Enzyme inhibition rate method Organophosphorus pesticide Carbamate pesticide COWPEA Rapid detection
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Additive manufacturing of Ni-based superalloys: Residual stress, mechanisms of crack formation and strategies for crack inhibition 被引量:9
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作者 Chuan Guo Gan Li +8 位作者 Sheng Li Xiaogang Hu Hongxing Lu Xinggang Li Zhen Xu Yuhan Chen Qingqing Li Jian Lu Qiang Zhu 《Nano Materials Science》 EI CAS CSCD 2023年第1期53-77,共25页
The additive manufacturing(AM)of Ni-based superalloys has attracted extensive interest from both academia and industry due to its unique capabilities to fabricate complex and high-performance components for use in hig... The additive manufacturing(AM)of Ni-based superalloys has attracted extensive interest from both academia and industry due to its unique capabilities to fabricate complex and high-performance components for use in high-end industrial systems.However,the intense temperature gradient induced by the rapid heating and cooling processes of AM can generate high levels of residual stress and metastable chemical and structural states,inevitably leading to severe metallurgical defects in Ni-based superalloys.Cracks are the greatest threat to these materials’integrity as they can rapidly propagate and thereby cause sudden and non-predictable failure.Consequently,there is a need for a deeper understanding of residual stress and cracking mechanisms in additively manufactured Ni-based superalloys and ways to potentially prevent cracking,as this knowledge will enable the wider application of these unique materials.To this end,this paper comprehensively reviews the residual stress and the various mechanisms of crack formation in Ni-based superalloys during AM.In addition,several common methods for inhibiting crack formation are presented to assist the research community to develop methods for the fabrication of crack-free additively manufactured components. 展开更多
关键词 Additive manufacturing Ni-based superalloys Residual stress Mechanisms of crack formation methods of crack inhibition
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Studies on Reduced Extent Method for Inhibited Thermokinetics Of Enzyme-Catalyzed Reaction──Inhibition of the laccase-catalyzed oxidation of o-dihydroxybenzene by m-dihydroxybenzene
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作者 Xiong Ya Wu Dingquan on Songsheng (Department of Chemistry, Wuhan University, Wuhan 430072,China)Du Yumin (Department of Enviromental Science, Wuhan University) 《Wuhan University Journal of Natural Sciences》 CAS 1996年第1期97-100,共4页
The thermokinetic reduced extent equations of reversible inhibitions for Michaiels-Menten enzymatic reaction were deduced, and then the criteria for distingushing inhibition type was given and the methods for calculat... The thermokinetic reduced extent equations of reversible inhibitions for Michaiels-Menten enzymatic reaction were deduced, and then the criteria for distingushing inhibition type was given and the methods for calculating kinetic parameters, KM,Ki and Urn were suggested. This theory was applied to inverstigate the inhibited thermokinetics of laccase-catalyzed oxidation of o-dihydroxybenzene by m-dihydroxybenzene. The experimental results show the inhibition belongs to reversible competitive type, KM=6.224×10-3 mol L-1, Ki=2. 363 × 10-2 mol. L-1. 展开更多
关键词 THERMOKINETICS enzyme-catalyzed reaction inhibition reduced extent method LACCASE
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Nitrification and denitrification as sources of gaseous nitrogen emission from different forest soils in Changbai Mountain
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作者 徐慧 陈冠雄 +2 位作者 李啊娜 韩士杰 黄国宏 《Journal of Forestry Research》 CAS CSCD 2000年第3期177-182,共6页
The contributions of nitrification and denitrification to N2O and N2 emissions from four forest soils on northern slop of Changbai Mountain were measured with acetylene inhibition methods. In incubation experiments, 0... The contributions of nitrification and denitrification to N2O and N2 emissions from four forest soils on northern slop of Changbai Mountain were measured with acetylene inhibition methods. In incubation experiments, 0.06% and 3% C2H2 were used to inhibit nitrification and denitrification in these soils, respectively. Both nitrification and denitification existed in these soils except tundra soil, where only denitrification was found. The annually averaged rates of nitrification and denitrification in mountain dark brown forest soil were much higher than that in other three soils. In mountain brown coniferous soil, contributions of different processes to gaseous nitrogen emissions were Denitrification N2O>nitrification N2O>Denitrification N2. The same sequence exists in mountain soddy soil as that in the mountain brown coniferous soil. The sequence in mountain tundra soil was Denitrification N2O>Denitrification N2. 展开更多
关键词 Nitrous oxide N2 NITRIFICATION DENITRIFICATION Forest soil Acetylene inhibition method
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