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。
2
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。
3
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.