Topic
Ultrastructure
About: Ultrastructure is a research topic. Over the lifetime, 5859 publications have been published within this topic receiving 124007 citations. The topic is also known as: ultramicroscopic structure.
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TL;DR: The morphological comparison between ameloblastoma and enamel organ was made, and the cause of the appearance of granular cells in the tumor was discussed, and it could not be determined whether the appearances of these cells reflected a low differentiation or a degeneracy.
Abstract: The ultrastructural features of five mandibular ameloblastomas were investigated. The morphological comparison between ameloblastoma and enamel organ was made, and the cause of the appearance of granular cells in the tumor was discussed. The peripheral columnar cells were morphologically similar to the inner enamel epithelium of the enamel organ. The central cells were similar to the stellate reticulum cells. There were not stratum intermedium-like cells in the tumors. This implied that the tumors were developed earlier than the enamel organ of bell stage. The squamous cells were sometimes found in the central part of the tumor cell masses. These cells were flat with a few organelles in the plasma, but had a lot of tonofilaments. This suggested that these cells were not active. Upon the ultrastructure, however, it could not be determined whether the appearance of these cells reflected a low differentiation or a degeneracy. Granular cells contained a lot of lysosomes, but no autophage was noticed. We thought that the appearance of these cells was due to accumulation of some unusual substances in the cells, the substances might be related with the glycosaminoglycan.
1 citations
01 Jan 2003
TL;DR: The surface ultrastructure of discus (Symphysodon spp.) eggs was investigated by a scanning electron microscopy technique and consisted of relatively smooth-sided, funnel-shaped vestibule at the bottom.
Abstract: The surface ultrastructure of discus (Symphysodon spp.) eggs was investigated by a scanning electron microscopy technique. The telolecital, oval and pale yellow colored mature discus eggs were possessed a micropyle and consisted of relatively smooth-sided, funnel-shaped vestibule at the bottom. The outer surface of the eggs were covered with pile of short fibrils.
1 citations
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TL;DR: In this chapter, conventional methods used for preparing renal tissue for transmission electron microscopy and a relatively new technique, serial block face scanning electron microscope, are described.
Abstract: In this chapter we describe conventional methods used for preparing renal tissue for transmission electron microscopy. We also describe a relatively new technique, serial block face scanning electron microscopy. Protocols are given for processing, sectioning, and imaging of tissue along with methods for obtaining quantitative data from the results.
1 citations
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1 citations