运输对犊牛的影响

关于血清杀菌和溶菌酶活力资料,我们在已有文献中没有发现,因此,决定研究运输时间对犊牛机体自然抵抗力的一些指标的影响。试验选择了14—20日龄临床健康体重45—60公斤的公犊30头,用装有可调节的犊牛小笼的半敞棚汽车运输,在秋冬时期和春季外界环境温度为5—15℃,牧场犊牛饲养及其运输条件都符合基本的卫生要求.     

Chromosomal composition of the genome in the monomorphic diplokaryotic microsporidium Paranosema grylli: analysis by two-dimensional pulsed-field gel electrophoresis

The molecular karyotype of Paranosema grylli Sokolova, Seleznev, Dolgikh et Issi, 1994, a monomorphic diplokaryotic microsporidium, comprises numerous bright and faint bands of nonstoichiometric staining intensity. Restriction analysis of chromosomal DNAs by "karyotype and restriction display" 2-D PFGE has demonstrated that the complexity of molecular karyotype of P. grylli is related to the pronounced length polymorphism of-homologous chromosomes. The background of this phenomenon is discussed in the context of ploidy state, reproductive strategy and population structure in this microsporidium. We propose that the remarkable size variation between homologous chromosomes in P. grylli may be a consequence of ectopic recombination at the chromosome extremities.     

Atrial fibrillation in cats: 50 cases (1979-2002)

OBJECTIVE: To determine signalment, clinical signs, diagnostic findings, treatment, and outcome for cats with atrial fibrillation (AF). DESIGN: Retrospective study. ANIMALS: 50 cats. PROCEDURE: Medical records of cats that met criteria for a diagnosis of AF (ECG consisting of at least 2 leads, clear absence of P waves, supraventricular rhythm, and convincingly irregularly irregular rhythm) and had undergone echocardiography were reviewed. RESULTS: There were 41 males (37 castrated) and 9 females (7 spayed). Forty-one were of mixed breeding; 9 were purebred. Mean +/- SD age was 10.2 +/- 3.7 years. The most common chief complaints were dyspnea, aortic thromboembolism, and lethargy. In 11 cats, AF was an incidental finding. Mean +/- SD ventricular rate was 223 +/- 36 beats/min. The most common echocardiographic abnormalities were restrictive or unclassified cardiomyopathy (n = 19), concentric left ventricular hypertrophy (18), and dilated cardiomyopathy (6). Mean +/- SD left atrial-to-aortic diameter ratio (n = 39) was 2.55 +/- 0.80. The most common thoracic radiographic findings were cardiomegaly, pleural effusion, and pulmonary edema. Median survival time (n = 24) was 165 days (range, 0 to 1,095 days). Eight of 24 cats lived for > or = 1 year after a diagnosis of AF was made. CONCLUSIONS AND CLINICAL RELEVANCE: Results suggest that AF occurs primarily in older adult male cats with structural heart disease severe enough to lead to atrial enlargement. Atrial fibrillation in these cats was most commonly first detected when signs of decompensated cardiac disease were evident, but also was commonly identified as an incidental finding.     

夹马口引黄灌溉工程信息化建设及

通过系统的介绍夹马口灌区在信息化建设中的工程需求、整体思路以及建设过程，并在建设内容中介绍了近期的建设内容和目标以及远期建设设想，提出了持续建设发展灌区信息化建设的思路，为灌区后续发展以及给兄弟灌区建设提供有益的参考。     

小波去噪的GPS算法在振动变形监

随着GPS接收机采样频率的不断提高和单历元解算算法的成熟,GPS已经成为一种新的用于建筑物振动变形监测的工具。但是GPS的精度受到卫星分布状况、大气折射、多路径效应和GPS处理算法等因素的影响,在振动监测中其精度有待于进一步的提高。提出一种利用多路径的周期重复性,并且结合小波去噪来消除GPS测量误差,从而提高其测量精度的新方法,实验证明该方法在振动监测中具有很好的实用性和可靠性。     

景电一期工程泵站综合调度自动化

为了保证景电一期工程泵站水工建筑物和机电设备的安全、可靠运行,较好地做到了级间流量的配合,使景电提灌工程自动化程度得以提高,对景电一期工程泵站进行了综合调度自动化改造。介绍了自动化系统的总体结构,功能及其运行方式。     

ABA受体结构及功能与ABA信号通路研究进展

植物激素脱落酸(abscisic acid ABA)可调控植物生长发育及应答病菌、干旱、高盐和低温等多种生物和非生物胁迫反应。从水生生物向陆生生物进化过程中ABA受体基因经历了从无到有的过程,ABA受体是ABA通路最上游的信号调节因子,能够识别ABA信号并启动信号转导。本文总结了ABA信号通路近年研究进展,包括ABA的转运与识别、ABA受体结构与功能的多样性等,同时阐明ABA核心信号通路是通过一个复杂的调控网络而相互作用。本文为通过改造核心ABA信号通路和ABA的运输系统来提高农作物的产量和品质提供了可参考的资料。     

银杏种植的施工方案

银杏树作为观赏价值和经济价值非常高的树种,近几年来越来越受到人们的重视,各地对于银杏树的栽植也越来越多。但由于不掌握正确的栽植技术,往往死亡率非常多。基于此,根据自己多年的实际经验,总结出一套适合银杏栽植的施工方案,以供读者借鉴。     

冬季栽植云杉的技术要点

为了改变冬季园林树种相对单调,色彩比较缺乏的现象,冬季栽植云杉等常绿树种变得越来越重要。本文就云杉冬季栽植的技术要点进行阐述,总结出了一套云杉的栽培管理技术,以期为云杉的生产提供技术支持。     

蓄滞洪区洪灾损失的评估方法及其

根据大黄堡洼蓄滞洪区的实际情况，建立了洪水演进模拟模型和洪灾经济财产损失评估模型，确定了各类财产的洪灾损失率，并进行了实际应用。结果表明：洪灾损失评估的详细程度可以满足防洪减灾部门对洪涝灾情评估的要求。与相同频率的洪水成灾情况相比，大黄堡水库建成后洪水所造成的经济损失会有比较大的减少。频率为5％的洪水并不产生任何淹没损失，频率为2％的洪水所造成的经济损失会从44964万元减少到9513万元。这说明水库的建设对该区域减轻洪水灾害损失是非常有帮助的。