Statistical analysis of spatial patterns of the heliozoanActinophrys sol
Statistical analysis of spatial patterns of the heliozoanActinophrys sol
复制标题
日光动物Actinophrys sol空间格局的统计分析
DOI：
10.1007/bf01281065
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发表时间：
1997
期刊：
影响因子：
2.9
通讯作者：
Y. Shigenaka
中科院分区：
文献类型：
--
作者：
M. Sakaguchi;T. Suzaki;Y. Shigenaka
用计算机辅助视频显微镜分析了太阳虫Actinophrys sol.的细胞间相互作用和空间分布。通过拟合优度统计（χ 2分析）和象限计数分析（Iδ曲线分析），表明细胞的空间点模式呈规则分布，这意味着有一种调节机制正在发挥作用，促进放射藻细胞中心的均匀空间分布。进一步尝试定义一个统一的模型来拟合在不同细胞密度下观察到的放线菌细胞分布。为此，进行了参数化势函数φ（r）=（σ/r）12的拟合，其中r是两个相邻细胞的细胞中心之间的距离。根据最大似然法估计缩放参数a，以获得数据的最佳拟合，发现其为细胞密度的递减函数;我们在低细胞密度（0.5个细胞/mm 2）下获得σ = 0.44 mm，在最高细胞密度（6.5个细胞/mm 2）下获得σ=0.10 mm。这些结果表明：（1）两个相邻细胞之间可能的最近距离主要由轴足长度定义;（2）在较低的细胞密度下，放线菌可以通过一些未知的方式识别远距离相邻细胞的存在。
Cell-to-cell interaction and spatial distribution of the heliozoanActinophrys solwas analyzed with computer-aided video microscopy. By means of goodness-of-fit statistics (χ2analysis) and a quadrat-count analysis (Iδ-curve analysis), the spatial point pattern of the cells was shown to be of regular distribution, which implies that a regulating mechanism is operating to encourage an even spatial distribution of the cell centers ofActinophrys. An attempt was further made to define a unified model which fitsActinophryscell distribution observed at different cell densities. For this purpose, the fitting of a parameterized potential function φ (r)=(σ/r)12was carried out, whereris the distance between cell centers of two neighboring cells. The scaling parameter a was estimated from the maximum likelihood procedure for obtaining the best fit for the data, which was found to be a decreasing function of the cell density; we obtained σ = 0.44 mm at a low cell density (0.5 cell/mm2) and σ=0.10 mm at the highest cell density (6.5 cells/mm2). These results suggest that (1) the possible nearest distance between two neighboring cells is primarily defined by the axopodial length, and (2) at lower cell densities,Actinophryscan recognize the presence of distant neighboring cells by some unknown means.