~(60)Coγ射线对甘薯黑斑病(Ceratocystis fimbriata)的抑制效果     

文永昌  陆漱韻  郑相如 《核农学报》1988,2(1):19-24

用60~(Co)γ射线25—400krad的不同剂量辐照甘著黑斑病菌及带病甘薯(Ipomoeabatatas Lam.)薯块,发现200及400krad剂量的辐照对菌丝体和子囊孢子有一定的抑制作用,对分生孢子、厚垣孢子抑制作用甚微;200krad在20天内基本抑制薯块上病斑的发生和发展,薯块外观良好,接种发病率比对照低75％,病斑平均直径不及对照的五分之一;400krad的抑茵效果更高,但尚不能完全杀死病菌孢子,并对薯块外表有伤害,使其色泽变暗,贮藏后期易产生干腐。本试验表明,200krad剂量的辐照处理对甘著贮藏有实践意义。  相似文献   

~(134)Cs在茶树上的行为     

徐寅良  陈凯旋  陈传群 《核农学报》1996,10(2):99-103

茶树喷洒~(134)Cs后,~(134)Cs在老茶叶上的残留和新茶叶上的吸收都遵循一级反应动力学模式。~(134)Cs叶面污染后危害性最大,水质污染和土壤污染具有潜在的危害性。茶树对~(134)Cs的富集能力低,K值为0.02;鲜茶叶经制茶加工后,~(134)Cs的损失率达13.3％;茶叶经4次浸泡后,~(134)Cs的总浸出率为83.6％。  相似文献   

稻萍鱼体系中红萍供氮的特点     

翁伯琦  唐建阳  陈炳焕  刘中柱 《核农学报》1992,6(1):51-56

应用~(15)N示踪技术,研究了稻萍鱼共生体系中红萍氮素的循环利用效率。试验结果表明,红萍作饵针对尼罗罗非鱼生长有良好效率,早、晚季稻田的鱼体增重率分别为47.9％和52.1％。鱼体排泄物对水稻生长有益,其稻谷产量与等量红萍压施作肥料的结果相近。早、晚季稻田罗非鱼对~(15)N-红萍的利用率分别为21.73％和23.76％,早、晚季水稻对鱼体排泄物中~(15)N利用率分别为18.90％和16.59％,其~(15)N总利用率分别达40.63％和40.35％。而红萍直接压施作肥料,早、晚季稻株对萍体氮素的利用率分别为28.84％和24.30％。  相似文献   

开发建设项目弃渣场设计及防洪问题   总被引：12，自引：1，他引：12  

徐永年  田卫宾 《中国水土保持》2003,(2):23-24

开发建设项目建设中,合理选取弃渣场,利用弃渣场弃渣是防止水土流失的重要环节,也是提高拦渣效率的重要保证。荒坡弃渣场设计应分析荒坡上加载弃渣后是否仍处于稳定状态,荒沟弃渣场设计应分析排水沟的泄洪能力,沟台地弃渣场挡渣墙与河滩弃渣场挡墙的设计应分析墙前冲刷深度。  相似文献   

箭筈豌豆AGAMOUS同源基因及其启动子的克隆和分析     

张磊  刘志鹏  王彦荣 《作物学报》2011,37(10):1735-1742

AGAMOUS(AG)是参与植物雌蕊和雄蕊发育调控的最重要花器官同源基因之一。通过TAIL-PCR、RACE和RT-PCR技术相结合,获得了箭筈豌豆花器官同源基因VsAG(VsAGAMOUS)及其上游调控序列。该基因DNA序列总长3 158 bp,CDS区域735 bp,编码含有244个氨基酸残基的蛋白产物。序列在氨基酸水平上与近缘植物豌豆PsAG基因序列一致性达98%,与拟南芥AtAG基因一致性为68%。将该基因在GenBank上注册,登录号为JF313850。生物信息学分析表明,VsAG基因第2内含子区域含有丰富的转录调控元件,在种类和功能分化上与基因上游调控序列表现出相似特征。这一结果暗示了第2内含子对豆科植物AG基因表达调控的重要作用,并为通过基因工程方法创造箭筈豌豆优良育种材料奠定了基础。  相似文献   

一个新的水稻窄叶突变体的遗传分析和基因定位     

李娟  李东宣  甘树仙  冯德党  朱骞  熊海波  张小玲  陈丽娟 《分子植物育种》2011,9(2):143-149

水稻叶片形态相关突变体是水稻功能基因组学研究和株型改良的重要材料.本研究以新的窄叶突变体MR11为研究材料,发现该突变体在整个生育期表现为窄叶、叶长变短和植株矮化.叶片组织结构观察发现由于叶脉数减少和叶脉问宽度减小,导致突变体倒二叶叶片宽度不及野牛型的1/2.F2和BC1F1两个群体分离结果表明该窄叶突变体表型受一对隐...  相似文献   

Image denoising using HMT in PDTDFB domain     

SHANG Zhao wei  ZHANG Feng  LANG Fang nian  YUAN Bo  LI Jian 《保鲜与加工》2011,(6):105-109

Based on the dependency of the PDTDFB coefficients across the interscale and interdirection and the statistical properties of HMT for the correlation properties, a new HMT in PDTDFB domain was put forward. Compared with the other typical denoising methods, the experimental results demonstrate that the proposed method shows better performance in image denoising, especially in edge maintenance.  相似文献   

Comparative study of low voltage ride-through techniques for doubly-fed induction generator wind turbines under asymmetrical grid faults     

LI Hui  LIAO Yong  YAO Jun  LIU Ren 《保鲜与加工》2011,(11):77-86

Asymmetrical grid faults occur more frequently and have more adverse effects on the doubly fed induction generator (DFIG) than symmetrical grid faults in the transmission system. The transient response of DFIG under asymmetrical grid faults is analyzed firstly. Meanwhile, operation behaviors of several low voltage ride-through (LVRT) techniques under severe asymmetrical grid faults are given by simulation with the Matlab/Simulink software. Then the characteristics of these LVRT techniques are further researched and analyzed based on the simulation results. Finally, the economies of these LVRT techniques are discussed. The conclusion lays a certain foundation for engineering development of these LVRT techniques.  相似文献   

Interference elimination of PCB and its ramification in determining trace PBBs/PBDEs by GC/MS     

HUA Li  ZHANG Hong-quan  ZHANG Lei  LIU Tao  HUANG Yuan-qiao 《保鲜与加工》2011,(7):137-146

The normal method to determine the trace brominated flame retardants such as polybrominated biphenyls (PBBs) and polybrominated diphenylethers (PBDEs) contained in the electronic and electrical products is gas chromatography/mass spectrometry (GC/MS). However, the method is based on the determinations of the persistent organic pollutants (POPs) such as polychlorinated biphenyls (PCBs), and polychlorinated naphthalene (PCNs) etc. The interferences of those compounds are inevitable. Therefore, in order to overcome this problem, two methods e.g. 1) The combination use of gas chromatography negative ion chemical ionization mass spectrometry (GC-NICI-MS) and gas chromatography-electron impact-mass spectrometry (GC-EI-MS) is employed, 2) a matrix solid-phase dispersion (MSPD) method with YMC ODS-C18 as carrier is developed. The result show that, by the former method, the brominated isomers or ramifications are distinguished remarkably from other halogen compounds because that anion fragment retention peaks of ［Br］-, ［HBr2］- and molecule chain fragment retention peaks of ［M+2］+,［M+4］+,［M+6］+,［M+8］+ are observed simultaneously, and thus the selectivity to determine bromine-containing retardant flames is greatly improved. Using the latter method, the gas chromatographic peaks of multiple polychlorinated biphenyls and polybrominated diphenylethers can be efficiently separated. Thus provides a project to solve interferences of POPs in brominated flame retardants’ determinations. The standard addition experimental results of 10 kinds of BDEs/PCBs belonging to 8 sorts of electronic and electrical equipment show this method has a high precision and reliability due to 60%～98% recovery and <9.5% relative error, which meet the needs regulated by the IEC Commission. It provides a technical support for electronic and eletrical industries in China to further comply with RoHS directive.  相似文献   

中国植物志第九卷第三分册所找述的种—Psathyrostachys Ianugínosa(Trin.) Nevski的订正     

颜济  孙根楼 《四川农业大学学报》1993,(3)

郭本兆教授提供的编志时所用的Psathyrostachys lanuginosa(Trin.)Nevski标本都是错订的。它们应当是Psathyrostachys stoloniformis Baden,Linde—Laursen et Dewey。该书描述的P.lanuginosa应订正为穗长10—30毫米,宽4—9毫米。穗轴节无明显翅状构造。该书描述的0.5毫米的翅状构造,仅见于P.stoloniformis的穗轴节的两侧。P.lanuginosa只分布于新疆的富蕴、青河两县。甘肃与青海分布的都是P.stoloniformis。该书图6:10—12所绘的不是P.lanugi—nosa,而是P.stoloniformis。  相似文献