小麦品种抗性多样化中寄主群体抗性量化的研究

 在一个地区范围内利用病原群体毒性及寄主群体抗性的观点,可把多个具不同抗锈性小麦品种在不同布局条件下,将其整体抗性加以综合量化,其结果在预测预报小麦锈病流行强度的研究中,有助于品种抗性因子对锈病流行强度所产生干扰作用的大小能够量化进入预测式.     

关于重庆市发展生态型都市农业的研究

本文在分析生态型都市农业基本内涵、基本特征的基础上，剖析了重庆市发展生态型都市农业的内外驱动力，对重庆市目前和将来发展生态型都市农业提出了一些可行模式和发展思路。作为中国西部和长江上游最大最重要的经济中心的重庆市，发展生态型都市农业，是实现农业现代化的必由之路。     

JXT60型大米窝眼滚筒精选机的研制

介绍了JXT60型系列大米窝眼滚筒精选机的结构特点、工作原理、技术性能．详细阐述了窝眼孔的形状和有关参数，并介绍了该系列精选机的堵孔清理机构、纵向倾角调节机构和通风机构等独创设计，这些机构可大大提高精选机的整体性能和成品大米的品质，还可节约投资，分析了米粒在精选机内的运动情况，并对主要参数进行了分析和计算．结果表明；该设备适应性强．可灵活使用。与平转筛相比，其具有巨大的优势．相对其他型号的精选机，其在技术上有很大的改进．     

老年糖尿病患者血清氨基酸含量的分析

本文报道了在日立835—50型氨基酸自动分析仪上。采用4×150mm柱,短程序方法对16例按WHO糖尿病诊断标准确诊的老年糖尿病患者的血清氨基酸含量进行了分析,得知一些特殊氨基酸含量的改变可以作为某些疾病诊断的参数。     

Acidic mammalian chitinase in asthmatic Th2 inflammation and IL-13 pathway activation

Chitin is a surface component of parasites and insects, and chitinases are induced in lower life forms during infections with these agents. Although chitin itself does not exist in humans, chitinases are present in the human genome. We show here that acidic mammalian chitinase (AMCase) is induced via a T helper-2 (Th2)-specific, interleukin-13 (IL-13)-mediated pathway in epithelial cells and macrophages in an aeroallergen asthma model and expressed in exaggerated quantities in human asthma. AMCase neutralization ameliorated Th2 inflammation and airway hyperresponsiveness, in part by inhibiting IL-13 pathway activation and chemokine induction. AMCase may thus be an important mediator of IL-13-induced responses in Th2-dominated disorders such as asthma.     

Lateral hopping of molecules induced by excitation of internal vibration mode

We demonstrate electron-stimulated migration for carbon monoxide (CO) molecules adsorbed on the Pd(110) surface, which is initiated by the excitation of a high-frequency (HF) vibrational mode (C-O stretching mode) with inelastic tunneling electrons from the tip of scanning tunneling microscopy. The hopping phenomenon, however, cannot be detected for CO/Cu(110), even though the hopping barrier is lower than in the CO/Pd(110) case. A theoretical model, which is based on the anharmonic coupling between low-frequency modes (the hindered-translational mode related to the lateral hopping) and the HF mode combined with electron-hole pair excitation, can explain why the hopping of CO is observed on Pd(110) but not on Cu(110).     

Palladium: preparation and catalytic properties of particles of uniform size

A method has been developed for the preparation of uniform palladium particles of diameter from 55 to 450 angstroms. Uniform particles of gold layered on palladium were also synthesized. Hydrothermal treatment of aluminum hydroxide sol was used to prepare rods of alumina with uniform cross section from 100 to 500 angstroms and of varying lengths. The palladium was adsorbed as individual particles on alumina rods, both present in aqueous suspension. Then the suspension was dried to give a catalyst containing metal particles of uniform size dispersed in open pores produced by the intermeshing of the alumina rods. This procedure guaranteed the absence of diffusion control in the rate of reactions observed experimentally. All stages of the preparation were monitored with the electron microscope. The kinetics of the ethylene-hydrogen reaction were examined by means of a pulse technique. The number of active sites determined by carbon monoxide titration of the surface was equal to the number of surface atoms as determined by the calculation of the quantities of compounds involved in the synthesis and electron microscope examination. Furthermore, the activity per site depended on the method of preparation, being four times smaller when sodium formate was used as a reducing agent instead of sodium citrate. This may be due to the fact that the shape of particles makes certain crystallographic planes more favorable. Decrease in the size of particles to 56 angstroms produced no effect on catalytic activity beyond that due to the increase in the number of surface atoms. The activity of commercial 5 percent palladium on alumina diluted 100-fold with alumina gave 80.4 percent conversion with propylene and 82.7 percent conversion with ethylene. Thus there was little difference in the behavior of the two olefins.     

梨胶锈菌重寄生菌(Tuberculina vinosa)对木瓜锈病菌的重寄生

在木瓜锈病(Gymnosporangiumasiaticum)发生期,利用梨胶锈重寄生菌(Tuberculinavinosa)的分生孢子孢悬液喷雾接种于木瓜锈菌性子器发生了重寄生现象。该重寄生现象发生于锈病病斑叶背锈子器处,紫色、半球状。被重寄生病斑无毛管状物产生。切片镜检重寄生菌产孢结构,其分生孢子座弧形平铺,大小平均直径为790 5μm;分生孢子梗栅状排列、近无色、平均为18 5μm×3 33μm;分生孢子无色、球形和椭圆形、平均大小分别为7 93μm和9 26μm×7 53μm。     

芒果雄性不育现象及花粉萌发研究初报

 对六个芒果品种观察表明:存在雄性不育现象对花粉进行萌发试验;各品种,各年度有差异。在20℃以下时无萌发,25～30℃时萌发率最高。在22～32℃时花粉自然条件下存放7小时后90%以上花粉元萌发力。     

Immunological Changes of Chicks Immunized with March＇s Disease Vaccines and Challenged with Virulent MD Virus

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