共查询到20条相似文献,搜索用时 46 毫秒
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在介绍樟树常见病虫害黄化病、樟叶蜂、樟巢螟、华南冠网蝽为害特征的基础上,从林业防治、物理防治、生物防治、化学防治等方面详细介绍了这些病虫害的防治措施,并简要介绍了部分防治方法的防治效果。 相似文献
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变性淀粉在我国的应用及发展趋势 总被引:7,自引:0,他引:7
本文介绍了我国食品、纺织、造纸等工业上应用的主要变性淀粉,其中重点介绍了羧甲基淀粉、交联淀粉、酸改性淀粉、阳离子淀粉的生产工艺、性质及其应用,同时对接枝共聚淀粉、复合淀粉等新型变性淀粉也作了简要介绍。 相似文献
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球虫病对畜禽生产的危害及防治 总被引:1,自引:1,他引:0
从球虫病的发生原因、传播途径、临床表现症状等方面介绍了球虫的发病机理,并介绍了球虫对畜牧业养殖产品鸡、猪、牛、羊的危害,从饲养、卫生、疫苗等方面介绍了球虫病的防治方法,以为广大养殖户提供技术支持。 相似文献
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赵大为 《农业工程技术:农产品加工》2016,(8)
该文主要介绍了平菇的三级种开放式制作方式,介绍了生料、发酵料、熟料与发酵半熟料栽培技术,其中发酵半熟料为目前主推方法,该文对其进行了重点介绍。 相似文献
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《农业工程技术:农产品加工》2009,(7):62-62
前面我刊为大家介绍了2008年荷兰国际园艺展览会上展出的红掌、金鱼草、仙客来、香石竹、网纹草、八仙花、果子蔓、丽穗凤梨、肾蕨等盆栽新品,本期介绍的是蝴蝶兰和虎尾草,截至本期2008年荷兰国际园艺展览会上展出盆花新品种已经介绍完毕。谢谢关注! 相似文献
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《农业工程技术:农产品加工》2009,(7)
前面我刊为大家介绍了2008年荷兰国际园艺展览会上展出的红掌、金鱼草、仙客来、香石竹、网纹草、八仙花、果子蔓、丽穗凤梨、肾蕨等盆栽新品,本期介绍的是蝴蝶兰和虎尾草,截至本期2008年荷兰国际园艺展览会上展出盆花新品种已经介绍完毕。谢谢关注! 相似文献
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本试验以菜豆品种先行者为试材,采用32孔、50孔两种规格穴盘,设置10、15、20、25 d等4个苗龄段,通过研究不同穴盘规格和苗龄对菜豆性状及产量的影响,筛选出适合菜豆育苗的穴盘规格和适宜的苗龄。结果表明:穴盘育苗的营养面积增大,菜豆产量随之增加,25 d苗龄条件下,32孔穴盘的前期产量和总产量均显著高于50孔穴盘;随着苗龄的增长,菜豆的前期产量和总产量呈增加趋势,其中25 d苗龄的产量显著高于其他苗龄。综合上述各项指标,菜豆育苗阶段,10 d苗龄可选用32孔、50孔穴盘,15 d以上秧苗选用32孔穴盘为宜。 相似文献
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ICP-OES法同时测定果蔬中铅、砷、镉、铬、铜、锡含量 总被引:2,自引:0,他引:2
果蔬样品经混酸消化后,控制一定的酸度,定容后应用等离子体发射光谱法(ICP-OES)对果蔬中铅、砷、镉、铬、铜、锡六种有害重金属进行测定,研究了分析测定条件,方法简单快速。测定结果表明,五种元素的加标平均回收率在91.0%~107%之间。其RSD均小于3.5%。按该方法进行处理及测定铅、砷、镉、铬、铜、锡,在选择的测定条件下最低检出限分别为0.0006 mg/kg、0.0003 mg/kg、0.00003 mg/kg、0.00005 mg/kg、0.00003 mg/kg、0.0006 mg/kg。 相似文献
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Segregation of form, color, movement, and depth: anatomy, physiology, and perception 总被引:63,自引:0,他引:63
Anatomical and physiological observations in monkeys indicate that the primate visual system consists of several separate and independent subdivisions that analyze different aspects of the same retinal image: cells in cortical visual areas 1 and 2 and higher visual areas are segregated into three interdigitating subdivisions that differ in their selectivity for color, stereopsis, movement, and orientation. The pathways selective for form and color seem to be derived mainly from the parvocellular geniculate subdivisions, the depth- and movement-selective components from the magnocellular. At lower levels, in the retina and in the geniculate, cells in these two subdivisions differ in their color selectivity, contrast sensitivity, temporal properties, and spatial resolution. These major differences in the properties of cells at lower levels in each of the subdivisions led to the prediction that different visual functions, such as color, depth, movement, and form perception, should exhibit corresponding differences. Human perceptual experiments are remarkably consistent with these predictions. Moreover, perceptual experiments can be designed to ask which subdivisions of the system are responsible for particular visual abilities, such as figure/ground discrimination or perception of depth from perspective or relative movement--functions that might be difficult to deduce from single-cell response properties. 相似文献
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Zhang M Fang S Zakhidov AA Lee SB Aliev AE Williams CD Atkinson KR Baughman RH 《Science (New York, N.Y.)》2005,309(5738):1215-1219
Individual carbon nanotubes are like minute bits of string, and many trillions of these invisible strings must be assembled to make useful macroscopic articles. We demonstrated such assembly at rates above 7 meters per minute by cooperatively rotating carbon nanotubes in vertically oriented nanotube arrays (forests) and made 5-centimeter-wide, meter-long transparent sheets. These self-supporting nanotube sheets are initially formed as a highly anisotropic electronically conducting aerogel that can be densified into strong sheets that are as thin as 50 nanometers. The measured gravimetric strength of orthogonally oriented sheet arrays exceeds that of sheets of high-strength steel. These nanotube sheets have been used in laboratory demonstrations for the microwave bonding of plastics and for making transparent, highly elastomeric electrodes; planar sources of polarized broad-band radiation; conducting appliqués; and flexible organic light-emitting diodes. 相似文献
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