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《西北农业学报》2008,17(1):215-215
(1)专著[序号]主要责任者.题名:其他题名信息[文献类型标志].其他责任者.版本项:出版地:出版者,出版年:引文页码[引用日期].获取和访问路径.[1]昂温G,昂温P S.外国出版史[M].陈生铮,译.北京:中国书籍出版社,1988.[2]全国文献工作标准化技术委员会第七分委员会.GB/T5795-1986中国标准书号[S].北京:中国标准出版社,1986.(2)专著中的析出文献[序号]文献析出主要责任者.析出文献题名[文献类型标志].析出文献其他责任者//专著主要责任者.专著题名:其他题名信息.版本项.出版地:出版者,出版年:析出文献的页码[引用日期].获取和访问路径.[1]程根… 相似文献
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李晓东 《中国农村小康科技》2010,(1):21-23
继在统筹城乡发展实践中确立了“三个集中”的双流模式后,双流县已走出了一条科学规划,统筹推进,长效发展的新农村建设新路子。课题组在总结分析双流县社会主义新农村建设的做法和经验的基础上,提炼出了推进新农村建设的“六大工作体系”和“四种工作机制”。 相似文献
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基于ITS序列的菟丝子PCR鉴定 总被引:6,自引:2,他引:6
提取了7个药用菟丝子种样品的DNA,采用ITS序列扩增通用引物对其进行PCR扩增,并对PCR产物进行克隆和测序.根据所测得菟丝子ITS全长序列与其常见易混品所在属的代表植物ITS序列比对,设计了一对特异性引物并进行了PCR检测.结果表明,此对引物能将药用菟丝子种子与4种易混品区分开来,可以用于药用菟丝子的真伪鉴定. 相似文献
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Variation in spectral characteristics of dissolved organic matter derived from rape straw of plants grown in Se-amended soil
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JIA Wei ZHAO Xiao-hu ZHAO Yuan-yuan XU Jia-yang MING Jia-jia CAI Miao-miao HU Cheng-xiao 《农业科学学报》2020,19(7):1876-1884
Straw return is an effective management practice. It not only utilizes agricultural waste but also introduces dissolved organic matter(DOM) into the soil. Selenium(Se) is an essential trace element in the human diet and contributes to the popularity of Se-enriched agricultural products in the Chinese market. Moreover, there are still some Se-enriched agricultural products that have yet to be utilized. This study investigated whether Se addition in soil caused component changes in the DOM extracted from rape straw. DOM extracted from rape straw grown in soil with four Se levels(0, 0.1, 0.5 and 1.0 mg Se kg–1 soil) was characterized by UV-Visible spectroscopy, fluorescence spectroscopy and FTIR spectroscopy. The UVvisible spectra revealed that 0.1 mg Se kg–1 soil reduced the molecular weight of DOM and caused the presence of more irreplaceable aromatic structures in the substituent groups of the DOM, while 0.5 and 1.0 mg Se kg–1 soil only reduced the DOM molecular weight. Fluorescence spectroscopy indicated that Se improved the humification degree but reduced the aromaticity of DOM. FTIR spectra proved that Se altered the contents of carboxylic acids, amino acids, alcohols and aromatic heterocycles in DOM, which were maximized in the 0.5 and 1.0 mg Se kg–1 treatment groups. We concluded that Se application could change the composition of DOM extracted from rape straw, potentially impacting the nutrient bioavailability in soil. This study provides basic data on Se-enriched rape straw utilization for eco-agriculture. 相似文献
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有机溶剂法提取棉花纤维中木质素 总被引:1,自引:0,他引:1
[目的]有机溶剂法提取的木质素纯度较高,可进一步分析木质素单体的类型.研究针对有机溶剂法提取棉花纤维中的木质素尚未见报道,利用甲酸、乙酸提取棉纤维中的木质素.[方法]用甲酸、乙酸和水的不同配比提取棉花纤维中的木质素,以确定合适的甲酸、乙酸、水体积比,并将用该方法提取的木质察进行紫外扫描,比较提取的棉花纤维木质素与标样木质素的扫描曲线.[结果]当甲酸、乙酸、水的体积比为55∶25:20时得到的木质素最多,有机溶剂提取的棉花木质素与标样木质素的扫描曲线相似.[结论]有机溶剂甲酸、乙酸适合于分析棉花纤维中的木质素.该方法为进一步研究棉花纤维中的木质素单体类型奠定了基础. 相似文献
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桔皮黄酮类化合物提取方法的研究 总被引:10,自引:1,他引:9
用不同的溶剂提取桔皮中的黄酮类化合物,并测定其含量。结果表明,用50%甲醇提取桔皮中黄酮类化合物的含量最高,提取率为6.6%。其它提取黄酮类化合物提取率较高的溶剂依次是75%甲醇、75%乙醇和冰局酸。同时对不同溶剂提取的黄酮类化合物做了薄层层析(TLC)的研究。 相似文献