Modeling air pollution in the Washington, D.C., to Boston megalopolis

Simplified meteorological models and pollutant source configurations were used to demonstrate the types of pollutant patterns that might be encountered in the Washington, D.C.-Boston megalopolitan corridor. A semirealistic source distribution and source intensity of carbon dioxide were used in this demonstration. The results of the computations suggest that local increases in quantities of pollutants may at times require regional rather than local source consideration.     

应用巢式PCR-RFLP方法鉴别我国常见的几种隐孢子虫

应用巢式聚合酶链反应(Nested PcR)-限制片段长度多态性(Restriction fragment length polymorphism,RFLP)方法对微小隐孢子虫(Cryptosporidium parvum)、安氏隐孢子虫(C.andersoni)、贝氏隐孢子虫(C.baileyi)和猪隐孢子虫(C.s...     

干旱胁迫对实生红橘、甜橙和柚叶中营养元素含量的影响

以红橘（CitrusrangerinaHolt．）、甜橙（CitrusssineasisOsbeck）、柚（CitrusgrandisOsbeck）实生苗为材料，采用模拟降雨控水长期干旱胁迫的方法，研究了降水量400和800mill的干旱胁迫对3种柑橘实生苗叶片的N、P、K、Ca、Mg、Fe、Zn、Cu、Mn、B元素含量的影响。结果表明：干旱胁迫降低了实生甜橙、红橘和柚的叶片中N、P、K、Ca、Mg、Fe、Cu、B元素的含量，增加了叶中Mn元素的含量；实生红橘和柚叶中的zn含量在降水量400mm的干旱胁迫下显著降低，而同样的干旱胁迫条件下，实生甜橙叶中的Zn含量极显著地增加了。干旱胁迫降低实生甜橙和红橘叶中N、Ca、Mg、Fe、Cu、B元素含量的作用相对较大。