Feed consumption,diet digestibility and mineral utilization in captive blackbuck (Antelope cervicapra) fed different levels of concentrates

A feeding trial was conducted to know the level of concentrates in the diet of Antelope cervicapra at which diet digestibility and mineral utilization were optimum. Fifteen blackbucks (25–33 kg BW) were distributed into three groups of five each. Fresh oat (Avena sativa) and berseem (Trifolium alexandrinum) fodders were offered ad libitum to all the animals. In addition, animals in groups II and III received concentrate mixture at the rate of 0.5 and 1% of BW, whereas animals in group I received no concentrates. As the level of concentrates increased, consumption of fodder decreased resulting in decreased consumption of neutral detergent fibre (NDFom), acid detergent fibre (ADFom), hemicellulose and cellulose. However, overall total dry matter (DM) and organic matter (OM) intake was not significantly different between the groups. Digestibility of DM, OM and gross energy (GE) increased while that of NDFom and ADFom decreased with increased level of concentrates in the diet. Intake of P, Zn, Cu and Mn increased with increased level of concentrate supplementation; however, consumption of Ca and Fe followed the reverse trend. Absorption of P and Zn increased with increased level of concentrate supplementation. Serum concentration of Zn increased when concentrate was supplemented at the rate of 0.5% BW beyond which there was no further improvement. Increasing the level of concentrates in the diet was resulted in increased serum glucose and cholesterol levels. Forage‐only diet was inadequate in supply of energy, P and zinc. Supplementation of concentrates at the rate of 0.5% BW was able to meet the requirement of these nutrients. Supplementation at the rate of 1% BW supplied energy and P in excess of requirement. It was concluded that the feeding of concentrates to the captive blackbuck fed forage‐based diets should be restricted to 0.5% of BW.     

多聚赖氨酸产生菌的筛选与理化性质研究

对采自长白山的20个土样进行多聚赖氨酸产生菌的筛选,通过富集培养,稀释平板法得到单菌落.通过形态培养特征现察和显微形态特征观察以及明胶液化、淀粉水解等生理生化试验对土样进行初筛,用滤纸片抑菌图法进行复筛,最后筛选出2个菌株,其气生菌丝为白色至雪白色绒状;基丝为无色至白色或各种黄色色彩;孢子椭圆形,孢子丝螺旋形,孢子表面光滑.根据形态特征和理化性质可以确定此菌为多聚赖氨酸产生菌[1-3],产量可达0.51～0.79 g/L.     

利用野生稻高代回交群体分析水稻农艺性状QTL

本研究用来源于马来西亚的普通野生稻(IRGC-105491)与珍汕97B杂交并回交构建148个株系的高代回交群体(BC_2F_4),用152个均匀分布的SSR标记构建了分子遗传连锁图,其图谱长为1 342.1 cM,相邻标记间距为8.8 cM.利用该群体检测定位到影响株高、生育期、穗数、穗长及千粒重、粒长、粒宽等农艺性状的27个QTL;在这些QTL中约有59%有利基因来源于野生稻.野生稻中有利基因的发掘和利用将为分子标记辅助培育水稻新品种奠定基础.     

稻草覆盖对土壤理化性状和烤烟产量及品质的影响

在湖南永州对稻草翻压、稻草覆盖、地膜覆盖、不还田不覆盖进行了连续3年定位试验。结果表明，两种稻草还田方式均能改善土壤结构，稻草覆盖比稻草翻压的改土效果更为明显；稻草覆盖在烤烟生根期的保温作用不如地膜覆盖，烤烟进入旺长期以后，稻草覆盖土壤温、湿度变幅较小，能够维持相对适宜的温、湿度状况，而地膜覆盖及裸栽处理的烤烟整个生育期土壤温、湿度变幅较大，不利于烤烟生长。稻草覆盖比稻草翻压及地膜覆盖更有利于烤烟产量及品质的提高。     

AB Intio Study on the Interaction between CH_4 and the Coal Surface

The atom cluster model of coal surface is proposed.Quantum chemical ab initio calculation with base set STO 4 31G indicates that the interaction between CH 4 and coal surface is anisotropy and the maximum interaction potential (or adsorption potential) is 2.65 kJ/mol,rotation potential barrier is 1.34 kJ/mol.These results have shown that the adsorption of methane on coal surface should be a physical process (that is,freezing on surface).     

国外森林环境水化学研究综述

 国外从19世纪开始进行森林降水化学的研究,那时主要的研究目的是论证森林对降水中水化学物质的再分配、迁移扩散规律等。20世纪70年代后期,大气沉降和环境酸化对森林水质的影响成为研究趋势。森林环境水化学问题成为近20多年森林水质研究的重点。文章综述了森林地区环境水化学的主要几个研究方向,并将大气沉降(主要是湿沉降)、林地水环境作为主要综述的内容。     

高等数学教学方法的探讨

以高等数学教学研究的基本理论为基础,分析了高等数学教育的现状以及存在的问题,对高等数学课程改革的方法及策略提出了建议和意见。     

内浮顶罐浮动出液装置的研制

为了适应民航的用油要求，在内浮顶罐中装浮动出液装置。根据设计原则和要求，设计出一种双回转接头的浮动出液装置。通过对浮动出液装置的受力分析、方案比较，说明了所设计的浮动出液装置对浮盘的作用力小，且能随浮盘一起上下运动，完全符合设计要求。     

农业院校开展绿色化学教育研究

简要介绍了绿色化学的内涵,阐述了开展绿色化学教育的必要性,提出了开展绿色化学教育的设想与措施。     

论高新技术与情报生长点

本文主要论述了高新技术及其特点;情报生长点及其特性;高新技术与情报生长点的关系等三个问题。作者从实践和理论角度去考察和研究高新技术与情报生长点的能量转换机制及其相互关系,使高新技术与情报生长点进行有机结合,真正成为发展国民经济的一颗璀璨的明珠。