花卉营养缺乏症的防治

1、缺磷:叶片由深绿色转为紫铜色,叶脉(尤其是叶柄)呈现黄中带紫色。花芽形成困难,开花小而少且色淡,导致果实发育不良,甚至提早枯萎调落。防治:增施骨粉、鱼粕、家禽肥或过磷酸钙、磷酸铵、磷酸钾(为磷、钾复     

嘉善县水稻土和稻米的硒含量状况及提高稻米硒水平的研究

对嘉善县水稻土和稻米的硒含量进行了分析.水稻土的有效态硒含量为9.52±2.26ppb,稻米硒平均为0.029±0.006ppm,普遍低于0.040ppm.提高稻米硒的田间试验表明,在水稻齐穗期喷施20ppm亚硒酸钠,可使稻米硒水平提高3～4倍,早、晚稻的稻米硒含量分别为0.197±0.149ppm和0.153±0.101ppm.     

水氮互作对水稻茎叶中氮形态及部分无机元素含量的影响

采用聚乙二醇(PEG6000)模拟水稻干旱胁迫方法，研究了水氮逆境下不同品种水稻茎叶氮素形态及部分无机离子含量的变化．研究结果表明，干旱胁迫使水稻茎叶中可溶性蛋白(SP)、全P、Na^ 含量降低，而对水稻体内全氮(TN)、蛋白态氮(prN)、非蛋白态氮(NprN)及K^ 、Ca^2 、Mg^2 含量的影响因品种而异，且与供氮水平有关．干旱胁迫下，氮素营养可明显增加水稻茎叶可溶性蛋白(SP)、全氮(TN)、蛋白氮(prN)及非蛋白氮(NprN)、全P、K^ 、Na^ 含量，但对Ca2^2 及Mg^2 含量的影响具有品种间差异性。     

医患漫画的多模态隐喻研究

目的:了解医患漫画的总体特征,发现医患漫画的主题隐喻类型、这些主题隐喻体现的作者态度及其可能产生的社会影响,为通过媒体宣传手段构建和谐医患关系提供参考。方法:运用认知语言学多模态隐喻理论对中国新闻漫画网中的医患漫画的主题隐喻进行分类统计,分析漫画作者的情感态度以及可能产生的社会影响。结果:医患漫画的主题隐喻可分为"互信合作"、"沟壑深渊"、"爱心责任"、"防范对抗"、"利益矛盾"等五大类型,其中"防范对抗"和"利益矛盾"两类为数最多,分别占44.44%和34.73%;从作者态度来看,绝大多数为消极隐喻性漫画语篇。结论:"防范对抗"和"利益矛盾"的医患漫画中过度地批判和揭露医患矛盾无益于问题的解决,反而可能产生消极、负面的社会影响,漫画作者和媒体不仅应该揭露和批判社会问题,更需要为解决医患矛盾作正面的引导,为构建和谐的医患关系做出积极的贡献。     

Microwave-assisted synthesis, anticonvulsant activity and quantum mechanical modelling of N-（4-bromo-3-methylphenyl） semicarbazones

Objective： To study the effect of halo substitution on disubstituted aryl semicarbazones on the anticonvulsant potential and model the activity based on quantum mechanics. Methods： A series of twenty-six compounds of N^4-（4-bromo-3-methylphenyl） semicarbazones were synthesized and evaluated for the anticonvulsant activity in the maximal electroshock seizure （MES） and subcutaneous pentylenetetrazole （scPTZ） seizure threshold tests. Some potential compounds were also tested in the subcutaneous strychnine （scSTY） and subcutaneous picrotoxin （scPIC） seizure threshold tests. The synthesized compounds were tested for behavioral impairment and CNS （central nervous system） depression in mice. Quantum mechanical modelling was carried out on these compounds to gain understanding on the structural features essential for activity. Results： Some compounds possessed broad spectrum anticonvulsant activity as indicated by their effect in pentylenetetrazole, strychnine, picrotoxin and maximal electroshock seizures models in resemblance to other aryl semicarbazone derivatives reported earlier. The higher the difference in HOMO （highest occupied molecular orbital） and LUMO （lowest unoccupied molecular orbital） energy levels was, the greater was the activity profile. Conclusion： The pharmacophoric requirements for compounds to exhibit anticonvulsant activity that includes one aryl unit in proximity to a hydrogen donor-acceptor domain and an electron donor have been justified with the molecular orbital surface analysis of the synthesized compounds.     

Potential production simulation and optimal nutrient management of two hybrid rice varieties in Jinhua,Zhejiang Province,China

Potential growth of two widely-grown hybrid rice varieties in the Jinhua district of Zhejiang Province, Shanyou63 for mid-rice and Xieyou46 for late rice, was simulated using a crop growth model of WOFOST. Parameters of the rice growth in WOFOST were calibrated through field experiments from 1999 to 2002 in Jinhua. The potential yield simulated with WOFOST was about 12 t/ha for Shanyou63 and 10 t/ha for Xieyou46, which are in good agreement with the highest recorded yield obtained in this area. Under farmers practice, current yield is about 7.5 t/ha for Shanyou63 and 6.5 t/ha for Xieyou46. There is a gap between the actual rice yield and the potential yield for these two hybrid rice varieties grown in this area. The attainable target yields were set to 70% to 75% of their potential yields for the two varieties. A recently developed software ＂Nutrient Decision Support System （NuDSS）＂ for irrigated rice was used to optimize nutrient management for these two rice varieties. According to NuDSS, the optimal fertilizer N requirement for the target yields was about 150 kg/ha for Shanyou63 and about 120 kg/ha for Xieyou46, which were only about 70% of the fertilizer N application under current farmers＇ practice. Comparing with farmers＇ practice, there is great potential to increase actual rice yields and to reduce fertilizer N use rates by improving rice crop management practice in Jinhua.     

课堂中教态的变化技能

教态的变化是指教师讲话的声音及教学中运用眼神、表情、手势等的变化。这种变化可以吸引学生的注意力,把无意注意变为有意注意,使课堂教学充满生机。     

基于大学英语四六级机考的多模态教学研究

随着大学英语四六级考试改革的不断深入,以多模态为载体的四六级机考开创了新的考试模式,这为大学英语的教学提出了新的课题。文章提出利用视觉、听觉、触觉、嗅觉和味觉进行多模态英语教学,从而提高教学效率并提高学生的英语运用能力。