地下长廊蜜蜂越冬技术的研究

依据蜜蜂室内外越冬原理和蜜蜂生物学特性,按养蜂生产的需要,研究设计了一种蜜蜂越冬的地下长廊,两侧放置1～3层蜂箱,中间为通道,上部封闭,留有进出气孔调节温度,人可以进入长廊管理越冬蜂群.挖建长廊的成本低,越冬期温度稳定,越冬蜂群势削弱率降低20.1%～24.3%,饲料消耗量降低10.5%～16.2%.     

黑龙江:玉米“过山车”急转“上行通道”

<正>日前,从黑龙江省粮食部门了解到,2010年3月初,黑龙江省农民玉米余粮还有69.5亿千克,约占玉米销售总量的45%,从3月中旬起销售企稳回升,目前所剩余粮已近35亿千克,摆脱了玉米销售不畅的困     

Cloning of Buffalo AQP9 Gene and Analysing its Expression in the Buffalo Tissues

Cloning buffalo AQP9 gene and analyzing its expression in buffalo tissues.A pair of primers was designed according to the released bovine AQP9 sequences in GenBank,which was used to clone buffalo AQP9 gene.The AQP9 gene was amplified by RT-PCR,whose nucleotide sequence and protein structure were analyzed by bioinformatics methods.The expression of AQP9 in buffalo tissues was assayed by Real-time quantitative PCR.The expression of AQP9 gene in buffalo ovary and testis tissue was detected by immunohistochemical staining method.The results showed that the cloned ORF length of buffalo AQP9 gene was 888 bp,which coded 295 amino acids.The results of multiple sequence comparison showed that the nucleotide sequence of buffalo AQP9 shared 99%,90%,97% and 88% homologeous compared with that of Bos taurus,Sus scrofa,Ovis ariessis and Homo sapiens,respectively,while shared 99%,86%,97%,83% homologeous for amino acids,respectively.Phylogenetic tree analysis indicated that AQP9 gene was highly conservative in the evolutionary process.Real-time quantitative PCR results showed that AQP9 gene expressed in buffalo liver,lung,brain,skin,testis and ovary tissues with different levels,had the most abundant expression in liver,followed by in skin and testis,less observed in lung and ovary.The results of immunohistochemical staining showed that the expression of AQP9 protein varied with the development of buffalo ovarian tissue,and gradually enhanced with follicle development.In testicular tissue,AQP9 protein expressed in spermatocyte and leydig cells of developmental stage testis.These results indicated that we had successfully cloned buffalo AQP9 gene sequences.The expression and its function of AQP9 in buffalo ovaries and testes might play an important role in follicle development and spermatogenesis.     

化肥价短期有望继续上扬

自5月初以来,国内外化肥市场整体回暖,氮磷钾肥及复合肥等价格都处在上升通道。目前国内尿素出厂价集中在2300元/吨左右,磷酸二铵在3275元/吨左右,95%氯化钾在3100元/吨,复合肥在2740元/吨,以下两     

兴安的创新——群众来种“群众树”

行驶在国道322线桂林至兴安县路段，一排排整齐的桂花树一直陪伴在两旁，这些桂花树枝繁叶茂，每株的树干都有四根竹竿固定着，在桂花树与桂花树之间夹种着小银杏树苗，树身裹着密密的似扇形的银杏叶。这便是兴安县通道绿化的实景。     

推动绿色增长 建设生态铜川——访陕西省铜川市林业局局长贺满仓

"十一五"以来,铜川市各级党委、政府高度重视林业工作,社会各界和广大人民群众积极投身生态建设,造林绿化步伐不断加快,森林资源保护管理持续加强,林业体制改革成效显著,林业产业发展方兴未艾,生态文明建设成效显现,林业生态状况呈现出整体好转、局部良性循环的态势,取得了国土增绿、农民增收、林业增效的显著成效,绿色已成为铜川大地     

复用跟踪通道数字信号处理

本文针对多系统多频点多模式接收机兼容数字处理技术,阐述了数字信号处理的基本原理,并就以往数字接收机的处理技术在灵活性和兼容性上的缺陷,重点研究了多系统多频点不同卫星信号的数字跟踪通道的复用技术,并对数字信号的跟踪处理技术(即信号捕获、扩频码跟踪、载波捕获及载波跟踪处理)进行了详细探讨,设计建立了由可设置的数字载波NCO、码NCO、扩频码产生器及配置控制软件组成的可复用的数字跟踪处理通道,具备对多系统的卫星定位信号进行捕获、跟踪的兼容性和灵活性处理能力。     

猪繁殖生理与人工授精新技术讲座(四)

(接上期) 1.5.2 附性器官的功能. 1.5.2.1 输卵管的功能.输卵管是卵子进入子宫的通道.其前1/3段较粗,称为壶腹部,是卵子受精的地方,其余部分较细,称为峡部;输卵管的前端接近卵巢,扩大呈漏斗状,叫做漏斗:漏斗边缘上有许多皱褶和突起称为伞,包在卵巢外面,可以保证从卵巢上排出的卵子进入输卵管;输卵管有以下三方面的功能:     

通道采取四条措施使拖拉机新牌证换发进展顺利

一是高度重视，加强领导。为做好“拖拉机05式牌证”换发管理工作，通道县农机局及时从实际出发，成立了以局长任组长，分管副局长为副组长、监理站站长等骨干人员为成员的换发新牌证工作领导小组，以加强对这项工作的领导和协调。     

电视接收机中频通道的研究

通过对产品电视接收机中频通道和自己在实验室组装中频通道的各项性能指标作了对比性的研究后，提出了如何进一步提高中频通道各项性能的建议，为中频通道集成化生产提供了一定的依据。