The trivanadium-subatituted heteropolytungstates have been synthesized from their lacunary precusor a-Na9GaW9O(34)H2.(183)W NMR spectrum of the title anion consists of two lines as expected for the C3v structure of th...The trivanadium-subatituted heteropolytungstates have been synthesized from their lacunary precusor a-Na9GaW9O(34)H2.(183)W NMR spectrum of the title anion consists of two lines as expected for the C3v structure of the trisubetituted A-type Keggin anion.展开更多
We investigated the seasonal and spatial ozone variations in China by using three-year surface ozone observation data from the six Chinese Global Atmosphere Watch(GAW)stations and tropospheric column ozone data from s...We investigated the seasonal and spatial ozone variations in China by using three-year surface ozone observation data from the six Chinese Global Atmosphere Watch(GAW)stations and tropospheric column ozone data from satellite retrieval over the period2010–2012. It is shown that the seasonal ozone variations at these GAW stations are rather different, particularly between the western and eastern locations. Compared with western China, eastern China has lower background ozone levels. However, the Asian summer monsoon(ASM) can transport photochemical pollutants from the southern to the northern areas in eastern China, leading to a northward gradual enhancement of background ozone levels at the eastern GAW stations. Over China, the tropospheric column ozone densities peak during spring and summer in the areas that are directly and/or indirectly affected by the ASM, and the peak time lags from the south to the north in eastern China. We also investigated the regional representativeness of seasonal variations of ozone at the six Chinese GAW stations using the yearly maximum tropospheric column month as indicator.The results show that the seasonal variation characteristics of ozone revealed by the Chinese GAW stations are typical, with each station having a considerable large surrounding area with the ozone maximum occurring at the same month. Ozone variations at the GAW stations are influenced by many complex factors and their regional representativeness needs to be investigated further in a broader sense.展开更多
【目的】筛选金边也门铁花叶性状相关差异表达基因,为深入探索也门铁叶色形成的分子调控机制打下基础。【方法】基于cDNA扩增片段长度多态性分析技术(cDNA-AFLP),利用64对Eco R I和Mse I选择性扩增引物组合分析金边也门铁叶片绿色与黄...【目的】筛选金边也门铁花叶性状相关差异表达基因,为深入探索也门铁叶色形成的分子调控机制打下基础。【方法】基于cDNA扩增片段长度多态性分析技术(cDNA-AFLP),利用64对Eco R I和Mse I选择性扩增引物组合分析金边也门铁叶片绿色与黄色部分组织cDNA,经筛选、回收、克隆、测序和BLAST比对分析获得差异表达基因。【结果】利用64对引物组合共扩增出1726条可分辨的条带,并获得58条差异表达的转录衍生片段(TDFs),其中12条TDFs为特异性表达。12条特异性TDFs中,5条TDFs具有同源序列,另外7条TDFs无同源序列,为未知功能基因。在叶片黄化部位特异表达同源性为96%的TDFs序列M8E3B-2和M8E3B-3与大丽花花叶病毒Holland包涵体蛋白基因、紫茎泽兰明脉病毒基因、洋丁香黄化卷叶病毒基因等花椰菜花叶病毒科病毒基因具有较高的同源性。【结论】M8E3B-2和M8E3B-3两条TDFs序列或来源于一种花椰菜花叶病毒科病毒基因,且有可能参与了金边也门铁花叶叶色性状的形成过程。展开更多
文摘The trivanadium-subatituted heteropolytungstates have been synthesized from their lacunary precusor a-Na9GaW9O(34)H2.(183)W NMR spectrum of the title anion consists of two lines as expected for the C3v structure of the trisubetituted A-type Keggin anion.
基金supported by the LAC/CMA(No.2017B02)the National Natural Science Foundation of China(No.41330422)the Special Fund for Meteorological Research in the Public Interest(No.GYHY201206015)
文摘We investigated the seasonal and spatial ozone variations in China by using three-year surface ozone observation data from the six Chinese Global Atmosphere Watch(GAW)stations and tropospheric column ozone data from satellite retrieval over the period2010–2012. It is shown that the seasonal ozone variations at these GAW stations are rather different, particularly between the western and eastern locations. Compared with western China, eastern China has lower background ozone levels. However, the Asian summer monsoon(ASM) can transport photochemical pollutants from the southern to the northern areas in eastern China, leading to a northward gradual enhancement of background ozone levels at the eastern GAW stations. Over China, the tropospheric column ozone densities peak during spring and summer in the areas that are directly and/or indirectly affected by the ASM, and the peak time lags from the south to the north in eastern China. We also investigated the regional representativeness of seasonal variations of ozone at the six Chinese GAW stations using the yearly maximum tropospheric column month as indicator.The results show that the seasonal variation characteristics of ozone revealed by the Chinese GAW stations are typical, with each station having a considerable large surrounding area with the ozone maximum occurring at the same month. Ozone variations at the GAW stations are influenced by many complex factors and their regional representativeness needs to be investigated further in a broader sense.
基金Supported by the National Natural Science Foundation of China(12071114)the Natural Science Foundation of Heilongjiang Province of China(LH2019A020)the Basic Research Expenditure of Universities in Heilongjiang Province,Special Fund of Heilongjiang University(KJCX201803,KJCX201804)。
文摘【目的】筛选金边也门铁花叶性状相关差异表达基因,为深入探索也门铁叶色形成的分子调控机制打下基础。【方法】基于cDNA扩增片段长度多态性分析技术(cDNA-AFLP),利用64对Eco R I和Mse I选择性扩增引物组合分析金边也门铁叶片绿色与黄色部分组织cDNA,经筛选、回收、克隆、测序和BLAST比对分析获得差异表达基因。【结果】利用64对引物组合共扩增出1726条可分辨的条带,并获得58条差异表达的转录衍生片段(TDFs),其中12条TDFs为特异性表达。12条特异性TDFs中,5条TDFs具有同源序列,另外7条TDFs无同源序列,为未知功能基因。在叶片黄化部位特异表达同源性为96%的TDFs序列M8E3B-2和M8E3B-3与大丽花花叶病毒Holland包涵体蛋白基因、紫茎泽兰明脉病毒基因、洋丁香黄化卷叶病毒基因等花椰菜花叶病毒科病毒基因具有较高的同源性。【结论】M8E3B-2和M8E3B-3两条TDFs序列或来源于一种花椰菜花叶病毒科病毒基因,且有可能参与了金边也门铁花叶叶色性状的形成过程。
