依托三大支柱发展犬业经济

当今社会科技日新月异，推动着社会文明进程和经济的快速发展，全球犬业呈现出蓬勃生机。纵观国内外犬业发展史，大多以优良品种、训用技术技能、器具研发为犬业的三大支柱，三方面强则犬业兴。笔者现就发展我国犬业的思考抛砖引玉，愿与犬业界有识之士共商。     

小兴安岭蕨类植物生态特性的研究

采用样线与样方相结合的调查方法，根据点相关系数及Ｘ＾２值连续性较正公式，测定了小兴安岭凉水自然保护区具有环境梯度的７个森林类型内主要蕨类植物的种间联结。结果表明：各林型均有其适生的蕨类类群，与该类群呈正联结的蕨类种其数量分布也多，反之刚少；具有环境梯度的不同林型序列，反映出蕨类植物适生生境的不同，据此，将本区主要蕨类植物分为４种生态类型。     

始丰微型牛体型与外周血cAMP、PTH和TGF-β水平关联性分析

为阐明始丰微型牛的生长发育相关的生化特性,采用ELISA方法对15月龄的始丰微型牛和作对照的正常体型天台黄牛测定并比较分析外周血中三个生长发育相关因子:cAMP、PTH与TGF-β.结果表明:微型牛组TGF-β含量(192.6 ng/L)极显著低于对照组(229.5 ng/L)(P＜0.01),cAMP和PTH含量与对...     

水泥砼路面改造前的病害处理

本文介绍的是在破损的水泥混凝土路面上进行沥青混凝土路面铺筑时,旧路面的处理方法和施工工艺。     

饲料添加剂类抗生素替代品在生猪养殖中的研究进展

随着现代社会的发展,集约化养殖成为主流趋势,抗生素的缺失往往会给养殖者带来巨大损失.但是,长期以来,抗生素滥用导致的细菌耐药性和药物残留问题日益严峻.随着我国2020年饲料添加剂类的抗生素的禁用,寻找高速、有效的抗生素替代品成为养殖业急需解决的重要问题.近年来,涌现出的各种饲料添加剂,如酸化剂、微生态制剂、酶制剂、植物...     

Taxonomic and Bioactivity Characterizations of Mameliella alba Strain LZ-28 Isolated from Highly Toxic Marine Dinoflagellate Alexandrium catenella LZT09

Microalgae host varied microbial consortium harboring cross-kingdom interactions with fundamental ecological significance in aquatic ecosystems. Revealing the complex biofunctions of the cultivable bacteria of phycosphere microbiota is one vital basis for deeply understanding the mechanisms governing these dynamic associations. In this study, a new light-yellow pigmented bacterial strain LZ-28 was isolated from the highly-toxic and harmful algal bloom-forming dinoflagellate Alexandrium catenella LZT09. Collective phenotypic and genotypic profiles were obtained to confidently identify this strain as a new Mameliella alba member. Comparative genomic analysis showed that strain LZ-28 shared highly similar functional features with other four marine algae-derived M. alba strains in spite of their distinctive isolation sources. Based on the bioactivity assaying, the mutual growth-promoting effects between bacterial strain LZ-28 and algal strain LZT09 were observed. After the culture conditions were optimized, strain LZ-28 demonstrated an extraordinary production ability for its bioflocculanting exopolysaccharides (EPS). Moreover, the portions of two monosaccharides glucose and fucose of the EPS were found to positively contribute to the bioflocculanting capacity. Therefore, the present study sheds light on the similar genomic features among the selected M. alba strains, and it also reveals the potential pharmaceutical, environmental and biotechnological implications of active EPS produced by this new Mameliella alba strain LZ-28 recovered from toxic bloom-forming marine dinoflagellate.     

48%盖灌能EC冬春两季防除加拿大一枝黄花试验

[目的]探索高效、节能的加拿大一枝黄花防除办法。[方法]设不同浓度的盖灌能EC、龙拳SG、农达AS、莎阔丹SL、使它隆EC与对照（CK）9个处理来验证防除效果。[结果]冬除药后7 d,除对照外各小区普遍表现叶片发黄、心叶萎蔫,其中48%盖灌能高、低量与20%使它隆处理中毒症状最明显,其次为46%莎阔丹处理。48%盖灌能同75%龙拳复配处理和41%农达处理中毒略轻,中毒最轻的为75%龙拳的两个处理;药后15 d,各用药处理中毒症状进一步加重;春除比冬天见效快。[结论]重发地区宜在春秋两季出苗高峰后连续两次用药,春除时采用48%盖灌能EC 3 L/hm^2或48%盖灌能EC 2 000 ml/hm^2＋75%龙拳SG 150 g/hm^2处理,冬除时除可选用春除配方外,还可使用41%农达AS 4 500 ml/hm^2。连续两次防治后,效果较理想。     

反刍动物脂类营养研究进展

反刍动物日粮中脂类的含量较低,精料中含2％～4％,粗料中含5％～7％。在常规日粮中,脂类大部分是以甘油三酯的形式存在,另外还有小部分的糖脂和角质脂（主要是蜡质和复合脂）。饲草中脂类主要是复合脂,包括糖脂和磷脂（70％～80％）。     

Pm67, a new powdery mildew resistance gene transferred from Dasypyrum villosum chromosome 1V to common wheat (Triticum aestivum L.)

Powdery mildew, caused by the biotrophic fungus Blumeria graminis f. sp. tritici (Bgt), is a global disease that poses a serious threat to wheat production. To ...