通过对图的密度矩阵简单的组合条件(“度数条件”)判断图的密度矩阵的可分性。这个条件直接与PPT判据相联系。

We test the separability of the density matrix by researching the simple combinatorial condition (the "degree condition"), the condition is directly related to the PPT-criterion.

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高海水浓度培养条件下的HW—1的细胞生长没有密度依赖性，而低海水浓度(10%或更低)培养条件下的细胞生长具有一定的密度依赖性。

HW-1 cells from high seawater-containing medium grew independently of cell-density, while those from low-seawater media (10% or less) showed density-dependent growth.

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