The permeability of the peritrophic matrix, essential for its function, depends on its chemical composition. The objective was to determine if the permeability of the peritrophic matrix varies along the midgut and in the presence of anti-peritrophin-55 antibody in Melipona quadrifasciata and Apis mellifera bees. The thickness of the peritrophic matrix in both species varies between the anterior and posterior midgut regions in workers. In A. mellifera dextran molecules with 40 kDa cross the peritrophic matrix, whereas those ≥70 kDa are retained in the endoperitrophic space. In M. quadrifasciata the peritrophic matrix permeability was for molecules <40 kDa. Bees fed on anti-peritrophin-55 antibody showed an increase in peritrophic matrix permeability, but survival was not affected. In the bees studied, the peritrophic matrices have morphological differences between midgut regions, but there is no difference in their permeability along the midgut, which is affected by peritrophin 55.

中文翻译：

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卵磷脂在蜜蜂Melipona quadrifasciata和Apis mellifera的工人中介导了周围营养层的渗透性。

营养基质的渗透性，对其功能至关重要，取决于其化学成分。目的是确定在Melipona quadrifasciata和Apis mellifera蜜蜂中，中肠和周围是否存在抗peritrophin-55抗体时，营养层基质的渗透性是否发生变化。在这两个物种中，工人的中肠前后区域之间的营养层基质厚度都不同。在具有40 kDa的A. meldexra dextran分子中，它们穿过营养层基质，而那些≥70 kDa的分子保留在胃内营养层空间中。在四叉线虫中，对于<40 kDa的分子，营养层基质的渗透性是。饲喂抗peritrophin-55抗体的蜜蜂显示出营养丰富的基质渗透性增加，但存活率未受影响。在研究的蜜蜂中