博爱县农田林网永续经营技术及效益分析

分析了博爱县农田林网形成后在生态、经济、社会等方面所产生的显著效益。总结了实现农田林网永续经营的具体方法。为平原地区农田林网的经营与管理提供了很好的依据。     

Research progress of carbon monoxide protection mechanism

Carbon monoxide (CO) has been considered as a fatal gas. Recent researches show that tissues generate carbon monoxide, and carbon monoxide plays a key role in the tissue physiological and pathological processes. The endogenous CO is generated from the decomposition of heme which is catalyzed by heme oxygenase enzyme (HO). Studies show that CO involves in the process of anti-inflammation, anti-apoptosis, regulation of vascular tone, modulation of leukocyte adhesion and platelet aggregation. CO also functions as neurotransmitters.     

动画演示方法在园林多媒体教学中的运用

本文探索了一种将动画演示应用于园林专业课程中的现代教学方法。从动画演示方法的适用对象与范围、动画制作的具体方法、动画在PPT中的调用等三个方面,详细介绍了该方法的使用理论与实际操作,并提出了影响动画演示的细节问题。最后,提出了该方法存在的一些问题,为其进一步发展与完善提供了思路。     

泰国龙眼品种的引进与研究

中国和泰国是世界上最重要的龙眼主产地.1981-2002年,福建省农业科学院果树研究所先后从泰国引进了苗翘、施冲蒲、潘通、依登和依多等龙眼品种在福州试种,长期试验观察结果表明,其耐寒力和嫁接亲和力与中国龙眼品种无明显差异.这些品种在福州虽均能开花结果,且多表现投产快、抽穗率高、晚熟,以及果核小、肉厚、高糖、质脆和香气浓郁等优良性状;但由于气候的差异和枝梢生长季节的缩短,在福州容易出现过度抽穗开花、新梢萌生不足、树势衰弱、坐果率低、果变小和不丰产等问题,难以直接在生产上大面积推广应用.除了要注意选择在与泰北气候较接近的地区种植,避免过早采收,以及做好疏折花穗,秋季灌溉,促进夏、秋梢萌生良好等工作外,最好能通过与我国的良种杂交,从中培育出既具有国内外先进水平的果实品质,又适宜中国栽培的鲜食龙眼新品种.     

威提特东非狼尾草种子生产技术的研究

比较了4种土壤类型和3种留茬高度对威提特东非狼尾草(Pennisetum clandestinum cv. Whittet)种子产量和质量的影响。结果表明:以单因素而言,生土处理和0.05 m留茬高度处理所获得的平均种子产量最高;两因素处理的结果表明,以生土和0.05 m留茬高度互作后所获得的种子产量最高,其种子产量达447kg/hm2;各土壤类型和不同留茬高度的处理对种子的质量影响差异不显著。     

Effects of Diseases on Reproductive Performance in Dairy Cattle Ⅰ: Current Situation and Its Mechanism

Over the past 20 years,with the continuous promotion of the genetic improvement plan of dairy cow population and the continuous improvement of feeding technology,the intensive level and milk yield of dairy cow population in China are continuously improving.However,the reproduction data over the years showed that the more milk yield,the more obviously decline in reproductive performance,and the more prominent of the reproductive problems.The decline of fertility caused by high yield has become the bottleneck of the development of dairy industry in China and even in the world.In dairy farming,there are many factors that cause the reduction of reproductive performance of high-yield dairy cows,including genetic factors,environmental factors and disease factors.Recently,the influence of disease factors on reproductive performance of dairy cows has become more and more prominent.According to the location of the disease,the diseases can be divided into genital diseases and non-genital diseases.This paper discussed the relevant research data on the effects of different diseases on the reproductive performance of dairy cows in recent years,and focusing on the analysis of the molecular mechanism of diseases affecting the reproductive performance of dairy cows through the nervous system,reproductive endocrine system and humoral immune system.The prospect and thinking for the future research of diseases and reproductive performance of high-yield dairy cows were put forward to provide reference and theoretical basis for improving the reproductive efficiency and economic benefits of high-yield dairy cows in China.     

西尼罗病毒病及其病原的研究进展

概述了西尼罗病毒病在国外的流行状况、危害及我国的研究现状,着重阐述了近年来在其基础病毒学、诊断技术、疫苗及防治方面的研究进展,为该病的深入研究提供了参考。