鸡转移因子最低有效浓度的确定

本文以实验鸡的减蛋综合征血凝抑制抗体效价为指示系统，来确定鸡转移因子的最低有效浓度。首先，用减蛋综合征灭能油佐剂疫苗免疫实验鸡，然后将实验鸡随机分为实验组（共六个组）和对照组。给实验组的实验鸡分别肌肉注射１ｍｌ含不同剂量的高浓度鸡转移因子，对照组注射１ｍｌ生理盐水。随后，定期采血，用微量血凝抑制实验测定其抗体效价的变化。结果表明：实验组有４个组与对照组差异显著（Ｔ〉２．３０６，Ｐ〈０．０５），其它组差异不显著，最低有效浓度为０．０４ｍｌ／只高浓度鸡转移因子。     

EM原露在番茄无土栽培上的应用试验

以番茄豫艺红将军为试材,在连栋温室无土栽培环境下,进行了EM原露对番茄生长与产量影响的研究。结果表明,EM原露对番茄生长和产量的提高有着显著促进作用,并随施用量的增加而增加。     

Quantifying fishing effort: a synthesis of current methods and their applications

The need to accurately quantify fishing effort has increased in recent years as fisheries have expanded around the world and many fish stocks and non‐target species are threatened with collapse. Quantification methods vary greatly among fisheries, and to date there has not been a comprehensive review of these methods. Here we review existing approaches to quantify fishing effort in small‐scale, recreational, industrial, and illegal, unreported and unregulated (IUU) fisheries. We present the strengths and limitations of existing methods, identifying the most robust methods and the critical knowledge gaps that must be addressed to improve our ability to quantify and map fishing effort. Although identifying the ‘best’ method ultimately depends on the intended application of the data, in general, quantification methods that are based on information on gear use and spatial distribution offer the best approaches to representing fishing effort on a broad scale. Integrating fisher’s knowledge and involving fishers in data collection and management decisions may be the most effective way to improve data quality and accessibility.     

Growth standards for nine North American fish species

Abstract  Standard methods for comparing population characteristics within and among fish populations greatly enhance communications among fisheries scientists, improve the efficiency of data analysis, and provide insight that helps guide management actions. Although standard methods are available for comparing some fish population characteristics (e.g. length structure, body condition), similar methods are lacking for comparing growth. The purpose of this study was to provide standards (i.e. percentiles and a standard growth model) for nine ecologically and recreationally important fish species. Percentile distributions of mean back-calculated length at age were estimated using data obtained from the published literature and from data solicited from state and federal agencies throughout North America. Percentiles of growth were estimated for bluegill, Lepomis macrochirus Rafinesque, common carp, Cyprinus carpio Linnaeus, flathead catfish, Pylodictis olivaris (Rafinesque), largemouth bass, Micropterus salmoides (Lacepède), sauger, Sander canadensis (Griffith & Smith), smallmouth bass, Micropterus dolomieu Lacepède, white bass, Morone chrysops (Rafinesque) and yellow perch, Perca flavescens (Mitchill). Standard growth models (i.e. von Bertalanffy models) were developed for these species and for channel catfish, Ictalurus punctatus (Rafinesque). These results provide tools that will help scientists compare growth of fishes across North America.     

Effect of Microclimatic Parameters at Different Sowing Dates on Capsule Production of Sesame (Sesamum indicum L.) in a Tropical Humid Region

An experiment was conducted during the summer seasons of 1993 and 1994 on sesame ( Sesamum indicum L.) to study the effect of certain meteorological parameters on the capsule production efficiency of the main stem and branches of sesame cultivars at different sowing dates in alluvial (Entisol) soil of the tropical humid region in West Bengal, India. The highest capsule production by the main stem and the first, second and third primary branches in accrocentric order was observed for the crop sown on 19 February. The number of capsules on the main stem was reduced by 70.51 and 34.98 % when the crop was sown on 21 March and 28 April, respectively. The humidity profile at 50 days after emergence (DAE) and photosynthetically active radiation (PAR) at 70 DAE had direct positive effects on main stem capsule production. The variations of 38, 21 and 56 % in main stem contribution to capsule production might be explained by the temperature profile, relative humidity and PAR, respectively. Thecultivar Rama produced higher numbers of capsules in branches than Kanke-1 and B-67 at all times of sowing.     

有压入渗条件下土壤结构与相对稳定入渗率间的关系研究

基于不同土壤结构下的有压入渗试验,分析讨论了土壤结构对稳定入渗率的影响及二者间的数量关系。结果表明,有压入渗条件下,土壤结构由疏松变密实,相对稳定入渗率降低,土壤结构与相对稳定入渗率间很好地符合幂函数关系。     

光谱水平电极撒样法同时测定 化探样品中银、锡、钼、铋四元素的研究

本文采用碘化钾＋ 光谱基物＋ 石墨粉为缓冲剂，以背景为内标，一次摄谱同时测定化探样品中的 Ａｇ 、 Ｓｎ 、 Ｍｏ 、 Ｂｉ４ 元素，绝对检出限（ｕｇ／ｇ） 分别为０ ．０２１ 、０ ．７９ 、０ ．１７ 、０ ．２０ 。测定范围（ｕｇ／ｇ） ： Ａｇ 为０ ．０２ ～２０ ； Ｓｎ 为０ ．８ ～５００ ； Ｍｏ 为０ ．２ ～２００ ； Ｂｉ 为０ ．２ ～２００ ，均能满足化探试样中微痕量元素测定的要求。本法在１ ｍ 光栅摄谱仪上摄谱，具有广泛的适用性，并且简便、快速、灵敏度高，成本低。     

低温胁迫下磷酸二氢钾对蔓花生的生理影响研究

施用KH2PO4后，蔓花生（Arachis dura nensis）植株的超氧化物歧化酶（SOD）活性和过氧化物酶（POD）活性高于对照。质膜相对透性（RPP）低于对照。说明KH2PO4可以提高蔓花生植株保护酶系活性，降低RPP，在一定程度上提高了蔓花生植株的抗寒能力。     

饲料营养价值的统一量化表达与应用

在配合饲料营养成分含量的基础上,按饲料的相对营养价值对配合饲料的营养价值作量化描述,从而使不同配合饲料的营养价值具备可比性。被量化的营养价值可以用来优选饲料配方,评估饲料效益,预测不同待试配合饲料在相同时间内的产量和生产效益、或生产等量产品所需的不同时间和成本。     

我国电信运营业发展现状及问题分析

自20世纪90年代开始我国电信体制改革以来,电信运营业取得重大进步,但是同时还存在大量的问题厦待改进。文中分析了我国电信运营业的发展现状,揭示了存在的问题,并根据新时期经济社会发展对电信服务的要求,对电信运营业健康快速发展提出了建议。