本试验旨在研究复合酵母培养物(CYC)对奶牛尿中嘌呤衍生物排出量及养分消化率的影响。选取年龄、体重、产奶量、乳成分及泌乳期相近(105.3±12.5)d的荷斯坦奶牛24头,分为4组,对照组和3个试验组每头每天分别添加0、80、100、120 g C...本试验旨在研究复合酵母培养物(CYC)对奶牛尿中嘌呤衍生物排出量及养分消化率的影响。选取年龄、体重、产奶量、乳成分及泌乳期相近(105.3±12.5)d的荷斯坦奶牛24头,分为4组,对照组和3个试验组每头每天分别添加0、80、100、120 g CYC,随全混合日粮(TMR)饲喂,预试期15 d,正试期30 d。结果表明:试验2组尿中嘌呤衍生物排出量极显著高于对照组(P<0.01),试验1组、3组显著高于对照组(P<0.05);在DM、Ca和P的表观消化率方面,试验2组显著高于对照组(P<0.05),试验1组和3组与对照组差异不显著(P>0.05),各试验组间差异不显著(P>0.05);在CP表观消化率方面,试验2组、3组显著高于对照组(P<0.05),试验1组与对照组无显著差异(P>0.05),各试验组间差异不显著(P>0.05);添加CYC对NDF和ADF的表观消化率无显著影响(P>0.05)。由此可见,在本试验条件下,复合酵母培养物的适宜添加量为每头每天100 g。展开更多
Electrochemical behavior of Co (bpy) on gold electrode and interaction of thiscomplex with adenine was investigated. Voltammetric experiments indicated that the electro-chemistry of Co(bpy) on gold electrode was quasi...Electrochemical behavior of Co (bpy) on gold electrode and interaction of thiscomplex with adenine was investigated. Voltammetric experiments indicated that the electro-chemistry of Co(bpy) on gold electrode was quasi-reversible with one-electron transfer re-action in phosphate buffer(pH=7.0).The formal potential, E°’was 0. 057 V.The electrontransfer rate constant, K., was 1. 43×10-2 cm/s. This property was characterized by spec-troelectrochemistry. Both anodic and cathodic peak potentials shifted to more positive valuesin the presence of adenine. In this case, E°’shifted to more positive potentials by 15 mV.The Ks’ descended about three times. The complex ratio was 1: 1. The complex constant was64. 2 L/mol.The interaction was testified by electrochemistry and spectrum of adenine.展开更多
文摘Electrochemical behavior of Co (bpy) on gold electrode and interaction of thiscomplex with adenine was investigated. Voltammetric experiments indicated that the electro-chemistry of Co(bpy) on gold electrode was quasi-reversible with one-electron transfer re-action in phosphate buffer(pH=7.0).The formal potential, E°’was 0. 057 V.The electrontransfer rate constant, K., was 1. 43×10-2 cm/s. This property was characterized by spec-troelectrochemistry. Both anodic and cathodic peak potentials shifted to more positive valuesin the presence of adenine. In this case, E°’shifted to more positive potentials by 15 mV.The Ks’ descended about three times. The complex ratio was 1: 1. The complex constant was64. 2 L/mol.The interaction was testified by electrochemistry and spectrum of adenine.
