Vessel and fibre - tracheid are both spiral thickening distinctly.
导管与纤维管胞均具明显的螺纹加厚。
Many vessel numbers, small pore, libriform fibres (mechanical tissue)and obvious secondary thickening of xylem tissue are the features of adaptation to the environment.
红树植物导管数量多、管孔小、机械组织为韧型纤维，薄壁组织次生加厚明显是适应环境的特征。
The proliferation of smooth muscle cells(SMCs), the collagen fiber deposition in the vessel wall and every caliber thickening was observed in hypoxic control group.
低氧空白组肺小动脉平滑肌增生，胶原纤维增多，管壁增厚，管腔狭窄；
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