棉籽饼粕在水产养殖中的应用   总被引：1，自引：0，他引：1  

王裕玉  杨雨虹  刘大森 《中国饲料》2011,(2)

本文综述了水生动物对棉籽饼粕的应用情况及影响水生动物对棉籽饼粕利用的制约因素.  相似文献   

CAD技术在农业机械设计中的应用     

廉杨 《农业科技与装备》2013,(5)

简单介绍CAD技术在我国的使用及发展历程,分析我国农业机械行业在使用CAD技术中存在的突出问题,提出使用CAD技术进行农业机械设计的正确方法,以推进我国农机CAD技术向更深层次发展.  相似文献   

辽宁省山区机耕道路管理养护建议     

廉杨 《农业科技与装备》2013,(3)

农村机耕道路是促进农业生产和发展农村经济的重要基础条件.介绍辽宁省山区农村机耕道路现状,分析制约山区机耕道路建设的主要原因,针对存在的问题,提出加强对机耕道路进行管理和养护的有效措施,确保山区机耕道路切实发挥出其作用与效益.  相似文献   

进气管路长度对进气噪声的影响     

黄进  杨凯  黄文兵 《农业装备与车辆工程》2013,(5):65-67

以对某款轿车进气噪声优化为例,介绍了如何通过以改变进气管长度的方式,衰减进气谐振器都难以消除的50-100Hz的进气口低频噪声,并通过GT-POWER模拟计算进气系统的插入损失,得到调整进气管长度对进气噪声影响的规律,最后进行实车验证,车内噪声得到良好改善。  相似文献   

Different genes can be responsible for crown rot resistance at different developmental stages of wheat and barley     

Xueming Yang  Jun Ma  Haobing Li  Hongxiang Ma  Jinbao Yao  Chunji Liu 《European journal of plant pathology / European Foundation for Plant Pathology》2010,128(4):495-502

Crown rot, caused by several Fusarium species, is one of the most damaging diseases in wheat and barley. Growing resistant varieties has long been recognised as an integral part in effectively managing the disease. One of the factors hindering the progress of breeding for crown rot resistance is the lack of a reliable and high throughput bioassay that allows rapid and accurate assessment of large numbers of genotypes so that highly susceptible materials can be quickly rejected and potentially resistant lines identified for more focused further assessments. We developed a method which, by growing several inoculated seedlings wrapped in a single piece of moist paper towel, offers significant advantages over all of the existing methods. The new soil-less assay takes only about two weeks, requires very little space, and removes variability associated with the use of soil/potting mixes. Results from the new assay are highly reproducible and agree well with known field performances of different varieties. However, mapping studies conducted using the new soil-less assay did not detect all of the quantitative trait loci found with a soil-based assay. These results show that, although different resistance genes may all contribute to the performance of a variety, caution should be used when comparing results from different assays.  相似文献   

Expression Patterns of the Serine Protease Gene AlSP 3 in Apolygus lucorum (Hemiptera: Miridae) at Different Temperatures     

SHENG Yang  SUN Yang  BAI Li-Xin  XIAO Liu-Bin  TAN Yong-An 《棉花学报》2013,25(6):541-548

As an important digestive enzyme gene, the serine protease gene AlSP 3 plays a key role in Apolygus lucorum for digesting conventional cotton. To understand the effect of different temperatures on the expression level of AlSP 3, we analyzed the expression patterns of AlSP 3 in A. lucorum reared at different temperatures using real-time polymerase chain reaction. The results showed that at the normal temperature of 24 ℃, the expression of AlSP 3 in A .lucorum at different nymphal stages was similar. The expressions of AlSP 3 in the female adult at the pre-mating stage and the male adult at post-mating stage were 19.71- and 7.16-fold higher than their control at the 1^st nymphal stage, respectively, which were significantly higher than at any other stages. However, expression in the 4^th to 5^th A. lucorum at the nymphal stage increased with rising temperature in the range of 21～30 ℃. At 30 ℃, the expression of AlSP 3 in the 2nd to 5^th A. lucorum was the highest. The expression levels of AlSP 3 in adult A. lucorum reared at different temperatures during the new emergence and pre-mating stages were significantly higher than that of the control reared at 24 ℃ (P < 0.01), while the expression during the post-mating stage at 18℃ was higher than that at other temperatures. When incubated at extreme temperatures (4 ℃ and 40 ℃), the expression of AlSP 3 in female and male adult A. lucorum was significantly higher than that at 24 ℃ (P < 0.01). Taken together, our results showed that the external environment temperature and the internal stage of A. lucorum or its sex all had significant effects on the expression of AlSP 3 in A. lucorum (P < 0.01), and that there was some interactions between them. Therefore, AlSP 3 is very important for the female adult A. lucorum to obtain nutrition at the early stages and temperature is an important limiting factor for the expression of AlSP 3.  相似文献   

中蜂来源的微孢子虫对意蜂工蜂的侵染性研究   总被引：2，自引：0，他引：2  

黄少康  杨守深  王丽华  付中民 《中国蜂业》2007,58(1):7-8,12

为探讨中蜂来源的微孢子虫对意蜂的侵染性,本试验将纯化自中蜂的微孢子虫,以每只蜂1×105个和5×105个孢子的接种量,分别给2日、5日、8日、11日龄无微孢子虫感染的意蜂成年工蜂接种,在30℃±0.5℃,65%～80%RH,黑暗中隔离饲养10日后,各日龄工蜂的平均感染率达86.3%～100%,每只蜂中肠的平均产孢量为5.60×105～3.39×106个。在两接种量下,2日、5日龄意蜂工蜂的产孢量均显著(P<0.05)高于8日、11日龄的产孢量。试验首次证实了中蜂来源的微孢子虫对意蜂成年工蜂具较强的侵染性。  相似文献   

Evaluation of physicochemical models for rapidly estimating cattle manure nutrient content     

Longjian Chen  Li Xing  Lujia Han  Zengling Yang   《Biosystems Engineering》2009,104(1):143-151

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阿维菌素驱除兔蛲虫试验报告     

卢少达  曹阳 《中国兽医寄生虫病》2007,15(6):35-37

朝阳市近年养兔业得到了很大发展,兔寄生虫病对养兔业的危害已引起人们重视。在朝阳市兔体寄生虫调查中发现,兔蛲虫对兔的感染率很高,从外贸冷冻加工厂、康宁医院兔场、朝阳县一粮库兔场、龙城区西大营子集市、双塔区凌北集市购入的233只兔剖检所得,兔蛲虫感染率为81.1%(189/233),感染强度为50(2~1 220条),感染兔均有不同程度的肠炎变化,严重感染者毛焦、消瘦,生长缓慢,易继发其它疾病,严重影响养兔的经济效益,对养兔业发展造成威胁。为寻求一种较好的驱治兔蛲虫的药物,2005年9~10月作者利用康宁医院兔场和航发兔场饲养的兔及从市郊各集市购…  相似文献   

农村居民的人口学特征与有效实施农村环境教育的关系探讨——以江西省为例     

仰和芝  孙昌勇 《安徽农业科学》2007,35(30):9719-9720

农村环境教育是事关农村环境保护大局的基础性工作,是当前建设社会主义新农村的必然要求。农村环境教育应该面向所有的农村居民,但在具体实施农村环境教育时,要依据人口学特征,区分不同的目标人群,并据此确定不同教育内容和方式。  相似文献