An Ergonomical Study on Microscope Work

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...

An Electron Microscope Study of Myelin Figures

In the electron microscope, thin sections of OsO(4)-fixed myelin figures from the phospholipide fraction of human brain show a pattern of parallel dark lines with a repeating period of about 40 A. It is shown that the dark lines probably represent the reaction product of OsO(4) with double bonds in the fatty acid chains, thereby marking the central portion of one bimolecular lamella. The additi...

An Electron Microscope Study of Isolated Mitochondria

1. The present paper constitutes a preliminary study of the morphology of mitochondria by means of electron microscopy. 2. The mitochondria that were the subject of this investigation were obtained from a lymphosarcoma of the rat. They were separated from the other components of the leukemic cells by a method of differential centrifugation, and thus made available for direct examination in the ...

Experimental hypertrophic neuropathy: an electron microscope study.