H N Tung

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Thin sections of rabbit granulosa, human SW-13 adrenal cortical adenocarcinoma, and mouse B-16 melanoma cells revealed an apparent single-layered basket of 4- to 7-nm filaments surrounding cytoplasmic gap junction vesicles. This interpretation was based upon apparent longitudinal, cross, and en face sections of structures surrounding the vesicle profiles in(More)
Granulosa cell gap junctions in the mammalian follicle are dynamic bimembranous structures which are assembled within apposed plasma membranes of adjacent cells. Once initially formed, these specialized intercellular junctions grow through the insertion of additional elements into the interacting membranes or through the aggregation of smaller patches into(More)
The rat primary decidual zone (PDZ) is a transitory, avascular region of transformed fibroblasts surrounding the implanting embryo. Tracer studies have indicated that the PDZ is selectively permeable to macromolecules, permeability decreasing with increasing molecular weight of the tracer. To clarify the morphological basis of the permeability barrier, we(More)
We have previously described a model of partial esophageal obstruction which leads to hypertrophic and degenerative changes in the smooth muscle cells. In the present communication we describe changes occurring in the myenteric plexus including increased thickness, varicosities and irregular angulations of nerve fiber bundles. The perikarya of myenteric(More)
Early diplotene oocytes from Necturus maculosus ranging from approximately 0.2 to 0.5 mm in diameter were examined by electron microscopy. In the smallest oocytes of this range, the cytoplasm is largely devoid of membranes, but contains primarily ribosomes and mitochondria. In slightly larger oocytes, smooth-surfaced cytomembranes first appear in the(More)
Membranes of teleost female gametes and investing layer of follicle cells characteristically exhibit a prolonged, close spatial relationship. This relationship is manifested, in part, by numerous folds of the plasma membrane of both oocyte and follicle cells that extend through channels called pore canals within a thick, laminated extracellular coat, the(More)
Bundles of filaments have been observed in the vitellogenic oocyte of the zebrafish, Brachydanio rerio; and these filaments illustrate a close spatial and structural relationship to annulate lamellae. The filaments range from 6-8 nm in diameter, and the annulate lamellae may cap both rounded ends of the bundle as well as extend parallel to the surface of(More)
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