Influence of transparent exopolymer particles (TEP) on sinking velocity of Nitzschia closterium aggregates
Influence of transparent exopolymer particles (TEP) on sinking velocity of Nitzschia closterium aggregates
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DOI：
10.3354/meps182069
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发表时间：
1999-01-01
影响因子：
2.5
通讯作者：
Schartau, M
中科院分区：
文献类型：
--
作者：
Engel, A;Schartau, M
利用数字图像分析技术对300多个新月菱形藻聚集体在摇床培养过程中的沉降速度进行了测定。为了检查透明外聚合物颗粒（TEP）对聚集体沉降速度的影响，进行了具有不同TEP与细胞体积浓度比率的3个实验。结果表明，对于不含TEP的新月形氮藻聚集体，其沉降速度（U）与聚集体的等效球径（ESD）呈显著正相关，U（cm s（-1））= 1.89（ESD，cm）（0.55）。骨料的比TEP含量越高，下沉速度越低，尺寸与速度的关系越不明显。聚集体的过剩密度（Delta rho）来自速度测量和3维分形维数（D3）的聚集体计算从Delta rho的标度特性。D3的值从未超过2，并且与从图像分析获得的二维分形维数（D2）的值非常吻合。
Sinking velocities of more than 300 Nitzschia closterium aggregates were determined during roller table incubation using digital image analysis. To examine the influence of transparent exopolymer particles (TEP) on aggregate settling speed, 3 experiments with different ratios of TEP to cell volume concentration were conducted. The results showed that, for N, closterium aggregates without TEP, sinking velocity (U) was significantly related to the equivalent spherical diameter (ESD) of the aggregates, yielding U (cm s(-1)) = 1.89 (ESD, cm)(0.55). The higher was the specific TEP content of an aggregate, the lower was the sinking velocity and the less pronounced was the size versus velocity relationship. Excess densities (Delta rho) of aggregates were derived from velocity measurements and 3-dimensional fractal dimensions (D3) of aggregates were calculated from scaling properties of Delta rho. Values for D3 never exceeded 2 and fit well to Values of the 2-dimensional fractal dimension (D2) attained from image analysis.