多线染色体上可以看见膨胀而成的小泡，即是疏松区。疏松区部分是紧密缠绕的DNA分子松开，基因正在活动的部分，基因活动的结果产生RNA，所以疏松区部分总能检查到RNA。
结果表明：磨削损伤的主要形式有显微塑性变形磨痕、断裂剥落坑、磨削微裂纹和材料疏松区的塌坑；
It is showed that:(1)the major surface damage patterns due to grinding are microplastic deformation trace, fracture chipping pit, microcracks, and subsidence in the loosen region of material;
疏松的染色质区带主要位于细胞核的中心部。
Zones of loosely arranged euchromatin are located mainly in the center of the nucleus.
结果表明：在焊缝区域内存在着局部未熔区以及铸造疏松组织和二次裂纹等缺陷，这是导致试样低应力断裂的根本原因。
The results show that the partial unmelted region, casting defect structure and secondary crack form in the welding seam, which result in the low stress breakage of the samples.
应用推荐