Eutrophication, which is the enrichment of a water mass with inorganic and organic nutrients that support plant growth, is a key factor in stimulating phytoplankton growth. In this study, we determined the effects of ...Eutrophication, which is the enrichment of a water mass with inorganic and organic nutrients that support plant growth, is a key factor in stimulating phytoplankton growth. In this study, we determined the effects of various nitrogen sources, different nitrogen concentrations in the culture medium, and two culture methods on the growth of the green alga, Enteromorpha prolifera. The relationship between the specific growth rate of E. prolifera and NO3-N concentration was consistent with that estimated using the Monod equation （R2=0.9713, P〈0.01）. In the N O3-N medium, the maximum specific growth rate was calculated to be 0.1634/d and the semi-saturation constant was calculated to be 16.86 μmol/L. Our results show that E. prolijkra can effectively utilize NH4^＋-N, NO3^-N, and NO^2-N and urea-N in the range of 5 to 50 μmol/L. NH4^＋-N was preferentially assimilated by E. prolifera, and urea-N was favorable for long-term growth.展开更多
2014年10月18日,在时隔八年、筹备了大半年之后,主题为《回望经典：中外档案学的比较与借鉴》的第三届中国档案学博士论坛终于召开了。时间仿佛与人们开了一个玩笑：当初立志要继往开来的档案学人,似乎又回到了出发前的原点？大家不禁...2014年10月18日,在时隔八年、筹备了大半年之后,主题为《回望经典：中外档案学的比较与借鉴》的第三届中国档案学博士论坛终于召开了。时间仿佛与人们开了一个玩笑：当初立志要继往开来的档案学人,似乎又回到了出发前的原点？大家不禁要问：历经八十年的中国档案学究竟路在何方？也许正像哈姆雷特说的“To be,or not to be”——“生存与毁灭”这的确是个问题。回首往事,民国初年的一些志士仁人开启了中国档案学的研究。由于政治和历史的诸多原因,这些学者的身世已在时间的流逝中而暗淡。展开更多
基金Supported by the Major Projects of Knowledge Innovation Program of Chinese Academy of Sciences (No. KZCX2-SW-208-01)the National Natural Science Foundation of China (No. 40976047)National Basic Research Program of China (973 Program) (No. 2010CB428701)
文摘Eutrophication, which is the enrichment of a water mass with inorganic and organic nutrients that support plant growth, is a key factor in stimulating phytoplankton growth. In this study, we determined the effects of various nitrogen sources, different nitrogen concentrations in the culture medium, and two culture methods on the growth of the green alga, Enteromorpha prolifera. The relationship between the specific growth rate of E. prolifera and NO3-N concentration was consistent with that estimated using the Monod equation （R2=0.9713, P〈0.01）. In the N O3-N medium, the maximum specific growth rate was calculated to be 0.1634/d and the semi-saturation constant was calculated to be 16.86 μmol/L. Our results show that E. prolijkra can effectively utilize NH4^＋-N, NO3^-N, and NO^2-N and urea-N in the range of 5 to 50 μmol/L. NH4^＋-N was preferentially assimilated by E. prolifera, and urea-N was favorable for long-term growth.
文摘2014年10月18日,在时隔八年、筹备了大半年之后,主题为《回望经典：中外档案学的比较与借鉴》的第三届中国档案学博士论坛终于召开了。时间仿佛与人们开了一个玩笑：当初立志要继往开来的档案学人,似乎又回到了出发前的原点？大家不禁要问：历经八十年的中国档案学究竟路在何方？也许正像哈姆雷特说的“To be,or not to be”——“生存与毁灭”这的确是个问题。回首往事,民国初年的一些志士仁人开启了中国档案学的研究。由于政治和历史的诸多原因,这些学者的身世已在时间的流逝中而暗淡。
