pit membrane

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

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；

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

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。

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

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。

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 .

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；

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

木材纹孔膜微孔尺寸与数目计算

In type A , the warty layer is absent or rare in pit chamber and in type B , the warty layer is present , in this paper , the variation in phylogeny of the pit membrane in bordered pits is also discussed .

A型是指纹孔室内瘤状层缺乏或罕见，B型则具明显的瘤状层。并对具缘纹孔在系统发育中的变化进行了讨论。