纹孔膜

对其导管分子上的侧壁穿孔板、多穿孔板和纹孔膜残余也进行了描述。

The lateral-wall perforation plates , multiple end walls and pit membrane vestige were also observed in the tracheary elements .

水分胁迫、冻害、病菌、机械胁迫、微生物引起的壁退化和纹孔膜的透性与空穴和栓塞的产生有关；

Factors related to the phenomena were water stress , freezing , pathogen , mechanical stress , microbial wall degradation and pit membrane permeability ;

通过光学数码显微镜和扫描电镜的观察，可以看到经超临界CO2流体处理后木材内的抽提物被浸提出，细胞壁上的纹孔膜被击破。

The extractives of wood solubilized and bordered pits destroy in tracheids were observed under a optics microscope scanning electron microscope after the woods were treated by SCF-CO_2 using benzene-ethanol as co-solvent .

木材纹孔膜微孔尺寸与数目计算

Calculation of pit opening radii and number of opening in wood pit membrane

电镜下发现湿心材部位管胞纹孔膜上存在水痕状、片状或块状的细菌，而在正常材部位却没有发现。

Bacterial , like flakily , water socked , and mass are found in pit membrane in .

其中有10种（隶8属、4科）木材维管间具缘纹孔膜具纹孔塞，其余不具纹孔塞。

Intervascular pit membranes with torns were found to be present in 10 species from 8 genera belonging to 4 families , but pit membranes were flat in the remainder .

显微结构有不同程度的变化，在电子显微镜下可以看到纹孔膜发生破裂，木材的径切面上产生横向的裂纹；

Secondly , the microstructure of larch wood was changed to some extent , the observed changes by scanning electronic microscope were the pit membrane cracking and the cross crack on radial section of the specimen .

在次生壁形成的整个过程中，在降解的细胞质、凝聚的染色质、纹孔和运输小泡膜上一直存在Ca2+。

During the secondary wall formation , Ca ~ ( 2 + ) persisted in the disintegrated cytoplasm , agglutinated chromatin and pit channel and transfer vesicles .