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The effect of methanol, formic acid and aqueous ammonia as nucleophiles on the ring cleavage of 1 was investigated.

8%文献值，首次采用低碳液态醇实现 1 的开环反应，产物为 FOX-7。

The sequences analysis indicated that complete open read frame of F gene of 3 isolates was 1662bp and encoded F protein of SS3 amino acids/There were 6 identically potential asparagine-linked glycosylation sites and the deduced amino acid sequence of the cleavage site region of F protein of the 3 NDV isolates that had the same amino acids pattern as velogenic strain was ~(112)R-R-Q-K/R-R-F~(117), which was accordant with the results of mean death time of chicken embryos and intracerebral pathogenicity index flCPI.

序列分析结果表明，所获得的3株分离株F基因完整的开放阅读框长度为1662bp，共编码F蛋白的553个氨基酸：QH3、HU和A4株均有相同的6个潜在的糖基化位点，其F基因的裂解位点为~(112)R-R-Q-K／R-R-F~(117)，符合强毒株裂解区氨基酸组成的特征，且与MDT和ICPI的测定结果相吻合。

The fragment of F gene covering cleavage site region was amplified by RT-PCR, cloned and compared. Basing on published sequences of representative NDV strains, a phylogenetic tree was constructed to analyse their variation relation.

第二部分：NDV Sddy-02株F基因的克隆与序列分析本试验设计了一对特异性引物，应用RT-PCR技术扩增出NDV Sddy-02株F基因含裂解位点区363bp片段，同时进行克隆和序列测定分析。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。