为考察不同形式蛋氨酸对建鲤生长的作用效果,实验以豆粕、鱼粉、棉粕为蛋白源,配制缺乏蛋氨酸的基础饲料(对照组,蛋氨酸含量为0.48%),在基础饲料中分别添加晶体蛋氨酸、微囊蛋氨酸、蛋氨酸羟基类似物(MHA)及蛋氨酸羟基类似物钙盐(MHA-C...为考察不同形式蛋氨酸对建鲤生长的作用效果,实验以豆粕、鱼粉、棉粕为蛋白源,配制缺乏蛋氨酸的基础饲料(对照组,蛋氨酸含量为0.48%),在基础饲料中分别添加晶体蛋氨酸、微囊蛋氨酸、蛋氨酸羟基类似物(MHA)及蛋氨酸羟基类似物钙盐(MHA-Ca),使蛋氨酸含量达到0.58%,获得5个饲料处理组,饲养平均体重为(8.6±1.0)g的建鲤(Cyprinus carpio var Jian)8周。结果显示:各组鱼体增重率分别为343.51%、350.77%、382.80%、384.02%和385.59%;饲料系数分别为1.58、1.55、1.42、1.42和1.41;晶体蛋氨酸组鱼体增重率、饲料系数与对照组无显著差异(P<0.05),微囊蛋氨酸组、MHA组、MHA-Ca组增重率较对照组提高11.4%、11.8%、12.2%(P<0.05),饲料系数降低10.1%、10.1%、10.8%(P<0.05)。各处理组在肌肉水分、脂肪含量间无显著差异(P>0.05),MHA组肌肉粗蛋白含量较晶体蛋氨酸组显著下降,其他各组间无显著差异(P>0.05)。对摄食后不同时间的血清游离氨基酸浓度变化的分析表明,对照组在摄食后2h或3h达到峰值,晶体蛋氨酸组、MHA组在摄食后1h达到吸收峰值,微囊蛋氨酸组在摄食后1h或2h达到峰值,而MHA-Ca组则在摄食后3h达到峰值。上述结果表明,在蛋氨酸缺乏的颗粒饲料中补充晶体蛋氨酸,对建鲤生长性能无改善作用,而添加微囊蛋氨酸、蛋氨酸羟基类似物、蛋氨酸羟基类似物钙盐则显著提高了鱼体生长性能,降低饲料系数。展开更多
This paper deals with the recent advances in global positioning system(GPS). First of all,the principal error sources of GPS observations are analysed. Then the scientific applications of space based GPS are described...This paper deals with the recent advances in global positioning system(GPS). First of all,the principal error sources of GPS observations are analysed. Then the scientific applications of space based GPS are described,of which the TOPEX and Microlape missions are excellent examples of great success. With regard to the application of GPS to meteorology (GPS/MET),detailed description is given to earth based GPS/MET and space based GPS/MET,they stand at the front of recent advances in GPS.展开更多
This paper deals with the recent advances in global positioning system(GPS).First of all,the principal error sources of GPS observations are analysed.Then the scien tific applications of space based GPS are described,...This paper deals with the recent advances in global positioning system(GPS).First of all,the principal error sources of GPS observations are analysed.Then the scien tific applications of space based GPS are described,of which the TOPEX and Microlape missons are excellent examples ofgreat success.With regard to the application of GPS to meterorology(GPS/MET),detailed description is given to earth based GPS/MET and space based GPS/MET,they stand at the front of recent advances in GPS.展开更多
文摘为考察不同形式蛋氨酸对建鲤生长的作用效果,实验以豆粕、鱼粉、棉粕为蛋白源,配制缺乏蛋氨酸的基础饲料(对照组,蛋氨酸含量为0.48%),在基础饲料中分别添加晶体蛋氨酸、微囊蛋氨酸、蛋氨酸羟基类似物(MHA)及蛋氨酸羟基类似物钙盐(MHA-Ca),使蛋氨酸含量达到0.58%,获得5个饲料处理组,饲养平均体重为(8.6±1.0)g的建鲤(Cyprinus carpio var Jian)8周。结果显示:各组鱼体增重率分别为343.51%、350.77%、382.80%、384.02%和385.59%;饲料系数分别为1.58、1.55、1.42、1.42和1.41;晶体蛋氨酸组鱼体增重率、饲料系数与对照组无显著差异(P<0.05),微囊蛋氨酸组、MHA组、MHA-Ca组增重率较对照组提高11.4%、11.8%、12.2%(P<0.05),饲料系数降低10.1%、10.1%、10.8%(P<0.05)。各处理组在肌肉水分、脂肪含量间无显著差异(P>0.05),MHA组肌肉粗蛋白含量较晶体蛋氨酸组显著下降,其他各组间无显著差异(P>0.05)。对摄食后不同时间的血清游离氨基酸浓度变化的分析表明,对照组在摄食后2h或3h达到峰值,晶体蛋氨酸组、MHA组在摄食后1h达到吸收峰值,微囊蛋氨酸组在摄食后1h或2h达到峰值,而MHA-Ca组则在摄食后3h达到峰值。上述结果表明,在蛋氨酸缺乏的颗粒饲料中补充晶体蛋氨酸,对建鲤生长性能无改善作用,而添加微囊蛋氨酸、蛋氨酸羟基类似物、蛋氨酸羟基类似物钙盐则显著提高了鱼体生长性能,降低饲料系数。
文摘This paper deals with the recent advances in global positioning system(GPS). First of all,the principal error sources of GPS observations are analysed. Then the scientific applications of space based GPS are described,of which the TOPEX and Microlape missions are excellent examples of great success. With regard to the application of GPS to meteorology (GPS/MET),detailed description is given to earth based GPS/MET and space based GPS/MET,they stand at the front of recent advances in GPS.
文摘This paper deals with the recent advances in global positioning system(GPS).First of all,the principal error sources of GPS observations are analysed.Then the scien tific applications of space based GPS are described,of which the TOPEX and Microlape missons are excellent examples ofgreat success.With regard to the application of GPS to meterorology(GPS/MET),detailed description is given to earth based GPS/MET and space based GPS/MET,they stand at the front of recent advances in GPS.
