Electron Microscope Study ofAmbrosiaPollen (Compositae: Ambrosieae)

Wood Anatomy of Anthemideae, Ambrosieae, Calenduleae, and Articotideae (Compositae)

An Electron Microscope Study of Isolated Chromosomes.

HE limitation in the penetrating power of electrons is one of the most T serious obstacles in the study of chromosomes by electron microscopy. Chromosomes are generally larger than 0.2p in diameter and are nearly opaque to electron penetration. At various stages of the nuclear cycle, however, chromosomes change their size and shape. Dividing chromosomes are generally largest and “resting” chrom...

An Electron Microscope Study of Rhabdomyosarcoma.

An electron microscope study of idtraihin sections of two rhabdomyosarcomas revealed the presence of cytologic characteristics previously described in neoplasias: nuclear envelope invagination, reduction in number of organelles, reduced size of mitochondria, sioollen mitochondria. In addition, one group of seven centrioles was observed and many cells revealed the presence of aggregates of small...

Dental Wear: A Scanning Electron Microscope Study

Dental wear can be differentiated into different types on the basis of morphological and etiological factors. The present research was carried out on twelve extracted human teeth with dental wear (three teeth showing each type of wear: erosion, attrition, abrasion, and abfraction) studied by scanning electron microscopy (SEM). The study aimed, through analysis of the macro- and micromorphologic...

Electron Microscope Study of Lens Fibers

Comparative electron microscope investigations on sections of the lens cortex of the normal, mature rat, rabbit, monkey, and the normal calf reveal similar patterns of intracellular organization. The superficial lens fiber contains a nucleus, mitochondria, endoplasmic reticulum, dense granules, Golgi complex, and a quantity of small structures of low opacity which appear as filamentous and sphe...