高中生化学课堂笔记的详略与学业成绩相关性研究

界定了笔记覆盖率的概念,对高中生化学课堂笔记覆盖率与学业成绩、记笔记习惯与学业成绩以及合成变量与学业成绩的相关性进行了检测,并依据检测的结果,提出了帮助学生做好课堂笔记以提升学习能力的教学建议。     

Synthesis,Crystal Structure and Biological Activity of 1-（β-D-Glucopyranosyl）-3- amino-5-methyl-1H-1,2,4-triazole

The title compound 1-（β-D-glucopyranosyl）-3-amino-5-methyl- 1H- 1,2,4-triazole was synthesized and characterized by IR, 1H-NMR and elemental analysis. Its single crystals of 2H2O adduct suitable for X-ray analysis were obtained by the slow evaporation of a H2O solution and its structure was determined by single-crystal X-ray diffraction. The crystal belongs to orthorhombic, space group P212121 with a = 7.7490（15）, b = 10.424（2）, c = 17.447（4） A^°, V = 1409.3（5） A^°^3, Z= 4, C9H20N4O7, Mr = 296.29, Dc = 1.396 g/cm^3,μ = 0.120 mm^-1, S = 1.007, F（000） = 632, R = 0.0686 and wR = 0.1560 for 1217 observed reflections with I 〉 20（I）. The title molecules are linked through intermolecular hydrogen bonds to form two 1-D chain structures, and such adjacent chains are further linked by intermolecular hydrogen bonds and H2O bridges to form a 3-D supramolecular network structure. The preliminary bioassay results showed that the title compound exhibits fungicidal activities against Gibberella zeae and Colletotrichum orbiculare.     

(Z,Е)-1[1-(2,4-二氧吡咯烷-3-亚基)乙基]-4-烃基氨基脲类衍生物的合成与除草活性

以取代胺为原料合成6种N4-取代氨基脲,然后与5种3-(1-羟基亚乙基)-吡咯烷-2,4二酮类化合物反应合成了22种新型缩氨基脲类衍生物,即(Z,Е)-1[1-(2,4二氧吡咯烷-3-亚基)乙基]-4-烃基氨基脲,其结构经1H NMR,MS,IR和元素分析确证.初步生物活性测定表明,这类化合物对油菜根和稗草茎的生长具有抑制作用.