介绍一本新书——《硝酸盐与人类健康》

这是一本阐述饮食中摄入的硝酸盐对人类健康是否有害的科学著作。长久以来，人们一直被硝酸盐对人类健康具有种种害处的思想所灌输，整天生活在对硝酸盐的恐惧之中。根据国内外的资料，人体摄入硝酸盐的80％左右来自蔬菜。我国的饮食习惯又是以素食为主，蔬菜是主要的副食，多吃新鲜蔬菜是否会对健康造成不良影响?这是人们十分关心的问题。     

法国甘蔗分子生物技术研究进展

介绍了当前法国甘蔗分子生物技术所取得的最新进展，并阐述了目前正在进行的有关研究内容及其今后的发展方向。     

白菌僵分生孢子用于粉纹夜蛾幼虫的生物测定

本文记述了一种生物测定方法,能有效的用来测定昆虫病原真菌—白僵菌分生孢子制剂Beauveia bassiana(Bals)vuill,对取食用不同浓度的分生孢子表面处理叶盘上的粉纹夜蛾Trichoplusia ni(Hubner)一龄幼虫的毒力。48小时后,幼虫转移到未处理的半合成饲料上(温度25±1℃),五天后终止测定。这种生物测定的剂量—死亡率回归方程是:Y=2.1420 1.3352X。计算得出的致死浓度Lc20、Lc50和Lc80分别为每平方毫米上总分生孢子数32,139和590个。     

高粱产量及其它数量性状的遗传

1977年雨季在印度 Indore 进行的两个播期、两种肥力的随机区组试验(二次重复)中,种植 CSV_3、555(易感粒霉病)、IS9327IS9333、IS9530(轻感)、2219B、SPV29(中抗)及其全部可能组合成的 F_1。从单行小区内选取5株记载50%开花期、株高、单株籽粒     

两优2163再生栽培技术初探

探讨早稻 -再生稻模式的不同留桩高度与管理水平对两优 2 16 3产量性状的影响 ,结果表明 :两优2 16 3分蘖成穗率高 ,有效穗多 ;进行高桩收割再生管理的两优 2 16 3再生成穗率、产量最高 ;而低桩收割齐苗后稍加管理的 ,产量次之 ;两优 2 16 3高桩收割时 ,倒二倒三芽节位再生能力最强 ,三个以上叶片的再生苗多 ,产量比重大     

全球氮肥供应及需求展望（上）

影响氮肥消耗的主要因素有:人口增长、减少贫穷与改善营养不良的需要、农产品增长、人类饮食的变化、全球地区经济福利状况、耕地与水的可利用性以及有助于平衡、完善植物营养的政策。肥料的利用会被天气、种子发育、农业耕作实践及耕作体系、技术应用、农耕专业知识、环境管理     

早稻旱育稀植产量结构分析及增产的主要途径

通过早稻旱育稀植产量结构的生统分析，结果表明：构成早稻旱育稀植产量的四个主要因素除每穗粒数呈小的负相关外，其它三个因素均有正向作用，四章相互制约，相互统一的整体。其中以亩有效穗数对产量的贡献最大，结实率次之，穗穗粒数居第三，但与结实率的相差甚小，千粒重最小，栽培上，首先应保证有足够的有效穗数，力争增加每穗粒数和结实率，提高千粒重。     

Magnetic property of loess strata recorded by Kansu profile in Tianshan Mountains

Kansu (KS) profile is located in the east of Yili basin, western Xinjiang, where typical loess sediments are distributed. The magnetic parameters (such as IRM, SIRM SOFT, and M) and grain size in the KS profile were analyzed in the study. The results showed that the magnetic property of KS loess is dominated by ferrimagnetic minerals, such as magnetite and maghemite. Antiferromagnetic and superparamagnetic minerals also exist in the profile, but had less impact on magnetic susceptibility. Compared with the typical loess sediments of the central Loess Plateau in China, the strata of Kansu profile contained more magnetic minerals and hard magnetic minerals. The analysis of grain size for magnetic minerals indicated that the properties of loess and paleosol were respectively dominated by PSD/MD and coarse SSD magnetite. The research found that the contents of magnetic minerals in loess and paleosol sequences in Kansu profile were similar, but the proportion of fine grained magnetite and soft magnetic minerals were varying, which implies a positive relationship between the value of magnetic susceptibility and intensity of pedogenesis.     

Experimental Investigation on the Aseismic Behavior of Seismic Damage Masonry Wall Retrofitted with Grouting and Steel Hoops

In order to accurately evaluate the aseismic behavior of the seismic damaged masonry pagodas destroyed by Wenchuan earthquake and strengthened after the earthquake, a test was conducted to acquire related parameters on seismic performance from the specimens made by masonry and retrofitted with grouting and steel hoops. Taking a seismic damaged ancient masonry pagoda in Sichuan as a case study, four kinds of primitive specimens are fabricated by simulating the conformation of the masonry pagoda. Then the primitive specimens are destroyed under cycle loads and the damaged specimens are repaired by grouting and steel hoops. Cycle controlling tests are conducted with the specimens and relevant data are acquired. Experimental results showed that grouting combined with steel hoops could improve the ductility and energy dissipation capacity of a seismic damage of brick masonry structure, but it do a little to improve the stiffness of a seismic damage structure. And the cracking load of the repaired masonry is much lower than the original undamaged structure.     

补肾化癖方对PCOS大鼠卵巢颗粒细胞 CYP450表达的影响

〔摘要〕目的观察补肾化疲方对多囊卵巢综合征(PCOS)大鼠卵巢颗粒细胞CYP450蛋白表达的影响〔方法 运用补肾化疲方对PCOS模型大鼠进行干预后,采用免疫组化法观察卵巢颗粒细胞CYP450的蛋白表达〔结果模 型组与正常组比较,卵巢颗粒细胞CYP450的蛋白表达在表达面积及表达强度上均低于正常组,差异具有统计学 意义(P<0.01);补肾化疲方中、高、低剂量组及妈富降组用药后,卵巢颗粒细胞的CYP450的蛋白表达明显升高,差 异具有统计学意义(P<0.01, P<0.05);其中补肾化疲方中剂量对PCOS大鼠卵巢颗粒细胞CYP450的蛋白表达效果 最佳、结论补肾化疲方能增强PCOS大鼠卵巢颗粒细胞CYP450的蛋白表达,调节卵巢内分泌失调,改善PCOS高 雄血症.逆转卵泡的发育异常.使排卵成功、