共查询到20条相似文献,搜索用时 125 毫秒
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全国粮食生产先进市、县(区)衡阳市、岳阳市,赫山区、衡阳县、桃源县、沅江市、醴陵市、望城区、岳阳县、安仁县、湘阴县、祁东县、双峰县、衡南县、汨罗县、耒阳市、宜章县、湘乡市、华容县、湘潭县、邵东县、道县。全国粮食生产先进工作者许靖波、吴振文、朱克服、钟武云、戴渐红、杨厚波、王峰、陈安柏、黎作风、熊春来、龙国文。全国种粮大户陈文敏(衡阳县)、刘啸(澧 相似文献
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一、安徽亳州市政府药材生产办公室所属的中药种植技术推广中心,现有药材种苗繁殖基地200多公顷,常年提供板蓝根、桔梗、薏米、牡丹皮、白术、白芷、菊花、北沙参、黄芩、黄芪、怀牛膝、生地、山药、防风、天南星、党参、百合、丹参、玄参、大黄等60多个品种的种子种苗.该中心地址:安徽亳州市药都大厦508室,邮政编码:236800. 相似文献
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目前,微量元素对农作物具有增产增收作用,已被农业科技界所证实.氨基酸微肥的使用范围很广,从粮食作物(水稻、小麦、玉米)到油料作物(油菜、大豆、花生),以及经济作物(棉花、茶叶、烟叶、桑叶)、水果(苹果、梨、柑桔、荔枝、龙眼、桃、李、杏、葡萄)、蔬菜(黄瓜、青菜、扁豆)等,几乎对所有的农作物都有不同程度的促进作用. 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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