为提高发酵牛乳共轭亚油酸(CLA)含量,以植物乳杆菌(Lactobacillus plantarum LT2-6)发酵添加亚油酸的脱脂牛乳,并对其生成CLA的过程进行了研究。结果表明,接种后6h CLA开始生成,24h CLA生成量达到最高,再延长发酵时间后CLA生成量缓慢下...为提高发酵牛乳共轭亚油酸(CLA)含量,以植物乳杆菌(Lactobacillus plantarum LT2-6)发酵添加亚油酸的脱脂牛乳,并对其生成CLA的过程进行了研究。结果表明,接种后6h CLA开始生成,24h CLA生成量达到最高,再延长发酵时间后CLA生成量缓慢下降。接种3～12h,牛乳滴定酸度快速增加,12h后滴定酸度增加缓慢。发酵18h时CLA的生成速率最大;24h时,牛乳pH降到4.0,CLA生成基本停止。牛乳发酵过程中,pH下降是影响植物乳杆菌LT2-6转化LA生成CLA的主要因素。脱脂牛乳中加入LA,经植物乳杆菌LT2-6发酵、脂肪酸萃取和甲酯化,并用气相色谱检测,结果显示:生成的CLA主要为cis9、trans11/trans9和cis11-CLA。展开更多
In order to analyze the complex chemical kinetic mechanism systematically and find out the redundant species and reactions, a numerical platform for mechanism analysis and simplification is established basing on Path ...In order to analyze the complex chemical kinetic mechanism systematically and find out the redundant species and reactions, a numerical platform for mechanism analysis and simplification is established basing on Path Flux Analysis （PFA）. It is used to reduce a detailed mechanism for flame inhibited by phosphorus containing compounds, a reduced mechanism with 65 species and 335 reactions is obtained. The detailed and reduced mechanism are both used to calculate the freely-propagating premix C3H8/air flame with different dimethyl methylphosphonate doped over a wide range of equivalence ratios. The concentration distributions of free radicals and major species are compared, and the results under two different mechanisms agree well. The laminar flame speed obtained by the two mechanisms also matches well, with the maximum relative error introduces as a small value of 1.7%. On the basis of the reduced mechanism validation, the correlativity analysis is conducted between flame speed and flee radical concentrations, which can provide information for target species selection in the further mechanism reduction. By analyzing the species and reactions fluxes, the species and reaction paths which contribute the flame inhibition significantly are determined.展开更多
Based on the input-output relation of the cavity and the Faraday Rotation mechanism, we propose a scheme for generating the n-atom Greenberger Horne-Zeilinger state. In the scheme, the n-atom trapped respectively in n...Based on the input-output relation of the cavity and the Faraday Rotation mechanism, we propose a scheme for generating the n-atom Greenberger Horne-Zeilinger state. In the scheme, the n-atom trapped respectively in n spatially separate cavities would be entangled with the photons going through the atom-cavity system. The successful probabilities of our protocol approach unity in the ideal case. What is more, no requirement for separately addressing further lowers experimental difficulties.展开更多
文摘为提高发酵牛乳共轭亚油酸(CLA)含量,以植物乳杆菌(Lactobacillus plantarum LT2-6)发酵添加亚油酸的脱脂牛乳,并对其生成CLA的过程进行了研究。结果表明,接种后6h CLA开始生成,24h CLA生成量达到最高,再延长发酵时间后CLA生成量缓慢下降。接种3～12h,牛乳滴定酸度快速增加,12h后滴定酸度增加缓慢。发酵18h时CLA的生成速率最大;24h时,牛乳pH降到4.0,CLA生成基本停止。牛乳发酵过程中,pH下降是影响植物乳杆菌LT2-6转化LA生成CLA的主要因素。脱脂牛乳中加入LA,经植物乳杆菌LT2-6发酵、脂肪酸萃取和甲酯化,并用气相色谱检测,结果显示:生成的CLA主要为cis9、trans11/trans9和cis11-CLA。
基金Supported by the National Natural Science Foundation of China （51176181）, the National Basic Research Program of China （2012CB719704）, and the Research Fund for the Doctoral Program of Higher Education （20123402110047）.
文摘In order to analyze the complex chemical kinetic mechanism systematically and find out the redundant species and reactions, a numerical platform for mechanism analysis and simplification is established basing on Path Flux Analysis （PFA）. It is used to reduce a detailed mechanism for flame inhibited by phosphorus containing compounds, a reduced mechanism with 65 species and 335 reactions is obtained. The detailed and reduced mechanism are both used to calculate the freely-propagating premix C3H8/air flame with different dimethyl methylphosphonate doped over a wide range of equivalence ratios. The concentration distributions of free radicals and major species are compared, and the results under two different mechanisms agree well. The laminar flame speed obtained by the two mechanisms also matches well, with the maximum relative error introduces as a small value of 1.7%. On the basis of the reduced mechanism validation, the correlativity analysis is conducted between flame speed and flee radical concentrations, which can provide information for target species selection in the further mechanism reduction. By analyzing the species and reactions fluxes, the species and reaction paths which contribute the flame inhibition significantly are determined.
基金Supported by Natural Science Foundation of Fujian Province of China under Grant Nos. 2007J0197 and 2007J0002Funds of Education Committee of Fujian Province under Grant No. JB05336
文摘Based on the input-output relation of the cavity and the Faraday Rotation mechanism, we propose a scheme for generating the n-atom Greenberger Horne-Zeilinger state. In the scheme, the n-atom trapped respectively in n spatially separate cavities would be entangled with the photons going through the atom-cavity system. The successful probabilities of our protocol approach unity in the ideal case. What is more, no requirement for separately addressing further lowers experimental difficulties.
