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黄河口春、秋季节无机碳的行为变化 总被引：1，自引：0，他引：1
根据2009年5、9月黄河口考察航次数据,结合2004年9月和2006年4月的调查结果,讨论了春季与秋季黄河河口过程中无机碳的行为、差异,以及调水调沙对黄河口无机碳输运过程的影响,并采用黑白瓶法对黄河口不同盐度水体进行现场培养,验证浮游生物活动对DIC的消耗.结果表明:春、秋季节黄河口淡咸水混合过程中无机碳的输运形态和量均发生了显著变化,pCO2在淡咸水混合过程中迅速下降,DIC在低盐区发生了亏损,淡水端DIC浓度越大亏损区间越大.夏季调水调沙后大量泥沙在口门附近沉积形成的拦门沙群使河口淡咸水混合过程在较短的距离内完成,也可导致秋季DIC的亏损区间小于春季.浮游生物活动对CO2的消耗是导致黄河口低盐度区发生DIC亏损的主要原因,但同时也伴随有碳酸钙沉降对DIC的清除作用. 相似文献
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Inducing lipid accumulation in microalgae cells without suppressing cell growth is vital to the economical production of biodiesel from microalgae. In two experiments, we demonstrate that the cell concentration and lipid content of marine microalgae Isochrysis galbana depend upon the iron concentration in the growth media. In Experiment I, adding chelated FeCl 3 to the medium at the late exponential growth phase prolonged this phase and increased the lipid content in I. galbana cells. The fi nal cell density and lipid content of I. galbana supplemented with chelated FeCl 3 was approximately 2 and 1.65 times higher than that of non-supplemented cultures, respectively. In Experiment II, I. galbana cells in the late exponential phase were collected and re-inoculated into new media containing Fe 3+ at various concentrations. The fi nal cell concentration and lipid content were maximized at the highest iron concentration(38% biomass by dry weight at 1.2×10-5 mol/L Fe 3+). In this study, intracellular neutral lipid storage was evaluated by fl uorescent spectrophotometry using fl uorochrome Nile red, and the measurement conditions were optimized. 相似文献
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铁促进海水小球藻油脂积累的动态过程 总被引：6，自引：0，他引：6
许多微藻被认为是制备生物油燃料的理想原料，培养液中高浓度的Fe^3＋对海水小球藻（Chlorella vulgaris）的油脂积累有明显的促进作用。采用荧光分光光度法对尼罗红染色后的海水小球藻的油脂积累过程进行了观测，同时测定了铁对小球藻生长和叶绿素含量的影响。结果表明，高铁处理的小球藻出现了两次油脂积累高峰，且第2次脂积累的量显著高于第1次。 相似文献
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