两种盐度下凡纳滨对虾饲料中的最适动植物蛋白比

试验研究了不同盐度下（3和22）,以鱼粉和大豆浓缩蛋白为蛋白源,配制6种不同动植物蛋白比的饲料对凡纳滨对虾生长、成活和肝胰腺可溶性蛋白质含量的影响,饲养试验为期40 d。结果显示：（1）饲料动植物蛋白比可显著影响凡纳滨对虾增重率、成活率、肝体指数、肥满度和肝胰腺中可溶性蛋白质含量。增重率随饲料动植物蛋白比升高而升高,但当饲料中动植物蛋白比升至29∶8时,增重率不再明显升高,其它指标均先随饲料动植物蛋白比升高至一定程度,而后则稍有下降;（2）盐度22组对虾的增重率、成活率和肥满度显著高于盐度3组对虾,肝体指数却显著低于盐度3组,不同的盐度对凡纳滨对虾肝胰腺可溶性蛋白含量的影响不显著;（3）双因素方差分析结果显示,盐度和饲料动植物蛋白比对凡纳滨对虾增重率、成活率和肝体指数存在显著交互作用,最大值分别出现在盐度22下全动物蛋白饲料组、盐度22下全动物蛋白和动植物蛋白为29∶8的饲料组、盐度3下饲料动植物蛋白比为14∶23的饲料组中;（4）Broken-Line分析表明,3‰盐度下凡纳滨对虾最适饲料蛋白比为29.12∶7.79~30.29∶6.71,盐度22时为26.05∶10.95~29.03∶7.44。结果提示,饲料中氨基酸的组成和含量会随配方中动植物蛋白配比而改变,且不同盐度下凡纳滨对虾对饲料中动植物蛋白比的要求有所不同,但配饵中适当的动植物蛋白比可以满足虾对各种氨基酸的适宜需求。因此,在养殖过程中,需结合实际的养殖环境和饲料蛋白源种类,来设计适宜的实用饲料配方,这样才能达到降低生产成本,提高经济效益的目的。     

谈谈犬优越的感觉机能与科学运用

漫长的人类发展史上,有多少动物湮灭在岁月的烟尘里,而犬能一直伴随着人类繁衍生息,以至于在科学技术高度发达的今天还能够成为人们的得力助手,这主要归功于其优越的感觉机能。     

湖北省金银花产业发展现状及思路

金银花是我国传统的名贵中药材,是集保健、药用、观赏及生态功能于一体的经济植物。本文介绍了金银花的生态和药用价值以及生产加工现状,分析了湖北省金银花产业发展的现状及存在的问题,提出了金银花产业化发展思路。     

春蚕5龄立体条桑一日两回育研究

针对农村养蚕房屋紧、投入成本高、效益低的实际情况,在春蚕期进行了5龄立体条桑一日两回育研究,结果表明立体条桑育具有节省养蚕用房、生产用具简单、用桑量少、蚕茧产质量高于对照区等优点。     

无核葡萄干护色保绿技术试验

采用不同试剂处理在不同程度上能够缩短葡萄制干期 ,提高绿级品率 ;促干剂处理仍是目前效果较好的处理方式 ;利用太阳能集热式干燥荫棚 ,在葡萄成熟较晚 ,制干期气温降低较快的地区 ,可大大缩短制干周期 ,提高产品绿级品率。     

当阳市地理坐标转换参数及估算方法研究

通过在Google Earth中采集公共点的WGS84经纬度坐标、在DRG上采集北京54和西安80平面坐标,本文采用布尔莎七参数模型,估算出当阳市WGS84转北京54、西安80坐标和北京54转西安80坐标的转换参数,并用公共点坐标和影像叠合两种方法进行了转换精度检验,结果表明：WGS84转北京54、西安80坐标的误差〈2．5m,北京54转西安80坐标的误差〈0．3m,能满足林业调查规划的精度要求,所求参数可以在林业调查规划中使用。     

物联网概念与犬的芯片标识

物联网概念横空出世 2009年8月份以来,众多重量级人物的言谈,使“物联网”迅速成为新的热门词。“物联网”概念由此横空出世。     

硅藻土杀虫剂防治储粮害虫应用试验

通过对无公害储粮药剂硅藻土在南方高温高湿地区的实仓试验,对施用硅藻土的试验仓和没有施用硅藻土(其它处理完全一致)的对照仓进行水分、粮食品质、仓温、各层粮温和粮堆表面害虫发生情况进行定期检测,发现在南方高温高湿地区硅藻土对仓房仓温及粮温没有明显的影响,可避免粮食在储藏过程中粮食水分分层,对防治的高抗性扁谷盗有较好的抑制作用,对其它害虫的防治效果不明显.     

Fabrication and characterization of electrospun nanofibers of high DP natural cotton lines cellulose

Nanofibers of natural cotton lines cellulose, with a degree of polymerization above 10000, were prepared by electrospinning. The effects of cellulose concentration, flow rate and electric field strength on the morphologies of the fibers were systematically investigated. Furthermore, two effective improvements on the electrospinning apparatus were made: heating the pathway between the tip of the needle and the collector instead of the needle or the collector, and covering the drum with activated cellulose flake. High quality cellulose nanofibers were obtained under the optimized spinning conditions combined with the apparatus improvements. Moreover, oriented cotton nanofibers were acquired by elevating the rotation speed of the drum collector. The wettability of the nonwoven was greatly improved compared with the original activated cellulose. The obtained nonwoven or nanofibers of the natural cotton cellulose could be potentially applied in tissue scaffolds, protective clothing and high efficient water absorbing materials etc.     

Investigation on acoustic behavior and air permeability of struto nonwovens

This work deals with the study of acoustic performance of struto nonwovens and their relation to fabric air permeability. In order to achieve the objective of the research, sound absorption coefficient of struto nonwovens was determined via impedance tube method, the average value of sound absorption coefficient (α?) was calculated. Air permeability of struto nonwovens was examined by using FX3300 Textech Air Permeability Tester. Results showed that struto nonwoven exhibited good absorption ability at frequency bands 3000-6400 Hz while it was ineffective for frequency lower than 3000 Hz. Struto nonwovens with high GSM and fabric thickness showed better acoustic performance and lower air permeability. It was observed that α? was inversely proportional to air permeability, with correlation coefficient 0.95. It was concluded that air permeability can be used as a criterion of sound absorption behavior of struto nonwovens. A lower air permeability suggests a better sound absorption performance for struto nonwoven fabrics.