And the dense proteinous particles synthesized by these free ribosomes could be accumulated and developed directly in ooplasm into yolk granules without membranes.
The exine of pollen wall is of different electron density, the nexine dense and the sexine, comprising tectum, bacules, and foot layer, relatively thin.
This article is mainly about the characteristic and principium of automatic suberization dense-phase pneumatic conveying technology,and the experimental study in materiel transportation of PTA.