The hallmark of development in the Yangtze River Delta(YRD) of East China has been sprawling urbanization. However, air pollution is a significant problem in these urban areas. In this paper, we investigated and analy...The hallmark of development in the Yangtze River Delta(YRD) of East China has been sprawling urbanization. However, air pollution is a significant problem in these urban areas. In this paper, we investigated and analyzed the air pollution index(API) in four cities(Shanghai, Nanjing, Hangzhou and Ningbo) in the YRD from 2001 to 2012. We attempted to empirically examine the relationship between meteorological factors and air quality in the urban areas of the YRD. According to the monitoring data, the API in Shanghai, Nanjing, Hangzhou slightly declined and that in Ningbo increased over the study period. We analyzed the inter-annual, seasonal, and monthly variations of API, from which we found that the air quality had different temporal changes in the four cities. It was indicated that air quality was poor in winter and spring and best in summer. Furthermore, different weather conditions affected air quality level. The wind direction was considered as an important and influential factor to air pollution, which has an impact on the accumulating or cleaning processes of pollutants. The air quality was influenced by the different wind directions that varied with seasons and cities.展开更多
金钗石斛(Dendrobium nobile)是药用和观赏两用植物,其花型独特,色彩艳丽,是花卉市场上广受欢迎的春石斛兰品种之一。ABC模型中的A类基因参与花序分化和第一、二轮花器官的决定和发育,然而目前对春石斛兰中该类基因及其调控花发育的功...金钗石斛(Dendrobium nobile)是药用和观赏两用植物,其花型独特,色彩艳丽,是花卉市场上广受欢迎的春石斛兰品种之一。ABC模型中的A类基因参与花序分化和第一、二轮花器官的决定和发育,然而目前对春石斛兰中该类基因及其调控花发育的功能研究甚少。本研究从金钗石斛中克隆获得了1个与拟南芥A类基因AP1(APETALA1)同源的基因DnAPL1(APETALA1 LIKE 1),并推测其编码1个含247个氨基酸的蛋白。RT-qPCR检测显示该基因在金钗石斛中广泛表达,其中叶片的积累量最高;随着花芽的分化和发育,其表达水平逐渐升高。在野生型拟南芥中过表达DnAPL1可以增强FT表达,促使其提前开花;同时,过表达植株的萼片、花瓣等花器官的数量、形态或着生方式发生变化,幼嫩茎生叶呈现勺状。以拟南芥ap1-1突变体为背景的互补实验表明DnAPL1可以部分补偿该突变体的花型突变表型。本研究结果证实DnAPL1既参与开花时间的调控,也参与叶片、萼片和花瓣的发育。展开更多
The story of iron and steel production in China is one of constant and spectacular rise,but no one seemns to know yet if the story will hawe a happy ending.
In the transition from the plarned economy of the past to the socialist market economy of the pre-sent,people in charge of employ-ment in China have had to face many unprecedented problems and challenges.The problems ...In the transition from the plarned economy of the past to the socialist market economy of the pre-sent,people in charge of employ-ment in China have had to face many unprecedented problems and challenges.The problems are no doubt temporary.China is a country like no other:it has to establish its own unique employment system-one that will gradually and smooth-ly lock in with the socialist market economy as the latter takes shape.Not an easy task,but as long as the economy continues to grow and stay healthy,so will employment statis-tics.展开更多
Many locals in Dongxing still like to tell the story of what happened during the Spring Festival in 1989.Swarms of Vietnamese,oblivious of the border trenches left from the war in 1979 and the freezing Beilun River,si...Many locals in Dongxing still like to tell the story of what happened during the Spring Festival in 1989.Swarms of Vietnamese,oblivious of the border trenches left from the war in 1979 and the freezing Beilun River,simply decided to come into Dongxing for the day.展开更多
基金Under the auspices of Special Research Fund of the Ministry of Land and Resources for the Non-Profit Sector(No201411014-03)National Key Technology Research and Development Program of China(No.2012BAH28B04)
文摘The hallmark of development in the Yangtze River Delta(YRD) of East China has been sprawling urbanization. However, air pollution is a significant problem in these urban areas. In this paper, we investigated and analyzed the air pollution index(API) in four cities(Shanghai, Nanjing, Hangzhou and Ningbo) in the YRD from 2001 to 2012. We attempted to empirically examine the relationship between meteorological factors and air quality in the urban areas of the YRD. According to the monitoring data, the API in Shanghai, Nanjing, Hangzhou slightly declined and that in Ningbo increased over the study period. We analyzed the inter-annual, seasonal, and monthly variations of API, from which we found that the air quality had different temporal changes in the four cities. It was indicated that air quality was poor in winter and spring and best in summer. Furthermore, different weather conditions affected air quality level. The wind direction was considered as an important and influential factor to air pollution, which has an impact on the accumulating or cleaning processes of pollutants. The air quality was influenced by the different wind directions that varied with seasons and cities.
文摘金钗石斛(Dendrobium nobile)是药用和观赏两用植物,其花型独特,色彩艳丽,是花卉市场上广受欢迎的春石斛兰品种之一。ABC模型中的A类基因参与花序分化和第一、二轮花器官的决定和发育,然而目前对春石斛兰中该类基因及其调控花发育的功能研究甚少。本研究从金钗石斛中克隆获得了1个与拟南芥A类基因AP1(APETALA1)同源的基因DnAPL1(APETALA1 LIKE 1),并推测其编码1个含247个氨基酸的蛋白。RT-qPCR检测显示该基因在金钗石斛中广泛表达,其中叶片的积累量最高;随着花芽的分化和发育,其表达水平逐渐升高。在野生型拟南芥中过表达DnAPL1可以增强FT表达,促使其提前开花;同时,过表达植株的萼片、花瓣等花器官的数量、形态或着生方式发生变化,幼嫩茎生叶呈现勺状。以拟南芥ap1-1突变体为背景的互补实验表明DnAPL1可以部分补偿该突变体的花型突变表型。本研究结果证实DnAPL1既参与开花时间的调控,也参与叶片、萼片和花瓣的发育。
文摘The story of iron and steel production in China is one of constant and spectacular rise,but no one seemns to know yet if the story will hawe a happy ending.
文摘In the transition from the plarned economy of the past to the socialist market economy of the pre-sent,people in charge of employ-ment in China have had to face many unprecedented problems and challenges.The problems are no doubt temporary.China is a country like no other:it has to establish its own unique employment system-one that will gradually and smooth-ly lock in with the socialist market economy as the latter takes shape.Not an easy task,but as long as the economy continues to grow and stay healthy,so will employment statis-tics.
文摘Many locals in Dongxing still like to tell the story of what happened during the Spring Festival in 1989.Swarms of Vietnamese,oblivious of the border trenches left from the war in 1979 and the freezing Beilun River,simply decided to come into Dongxing for the day.
