所謂Microsomeを中心としたる細胞形質内構成要素形態の電子顕鏡的分析観察
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概要
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The spermatocyte of the insect, Oxya velox was studied with electron microscope, and the following observations have been made and described: 1. The minute granules which had previously been termed the microsomes were found scattered in every part of the cell. The microsome appears to constitute the basis of all the living structures in the cytoplasm and nucleoplasm. It was noted, however, that the microsome does not exist in the elements, such as coloidal substances, in which life is not manifested. 2. There is no doubt that the microme is the rudiment of all the parts of a cell responsible for its vital phenomenon. The presence of an amorphous lipoidal substance staining with osmic acid which adjoins every microsome cannot be overlooked. This substance has been termed the A-substance. 3. Two kinds of microsome granules have been discriminated, and they have been termed C-microsome and S-microsome. The former is substantial and appears to contain RNA, while the latter is vesicular and of slightly larger size. Despite this morphologic valiant, these two kinds clearly resemble each other. So they both should be classified as the microsome. What was observed and referred to as microsome by investigators with light microscope in the past must have been the C-microsome. 4. The microsome granule appears to be endowed with the ability of attracting other substances, reorganizd their structures and turn them out as new substances. The structure which was referred to as endoplasmic reticulum seems to be none other than this substance in its active phase. 5. The microsome granule appears to arise de novo in the A-substance now and then. The A-substance may be found to exist in a large quantity, or in a small quantity with the microsome granules. 6. The limiting membrane and the cristae mitochondriales in the mitochondria may be assumed to represent a condition of the A-substance containing a great many microsomes in it.7. The notion held by ancient people that the mitochondria are unchanging and retain permanency, transferred from generation to generation in an unbroken chain, is unacceptable. It was noted in the present experiment that they broke down, disappeared and regenerated. 8. There seems to be a force always at work in a cell, by which whole or a part of the structures in it may be destroyed and disappear. The structure which bears the brunt of this force will disappear entirely, leaving no trace of it. 9. The spindle fibril, which comes into being in mitosis, is an alignment of the S-microsomes that have changed their shape and become spindle-like. The spindle fibril usually disappears after completion of cell division, but may sometimes survive and persist. This is what was referred to as spindle remnant.
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