Denshi kenbikyo

[title in Japanese]

[in Japanese]

1951 Volume 2 Issue 1 Pages 9-15
Published: July 01, 1951
Released on J-STAGE: June 12, 2009

DOIhttps://doi.org/10.11410/kenbikyo1950.2.9

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[title in Japanese]

[in Japanese], [in Japanese]

1951 Volume 2 Issue 1 Pages 16-20
Published: July 01, 1951
Released on J-STAGE: December 09, 2009

DOIhttps://doi.org/10.11410/kenbikyo1950.2.16

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[title in Japanese]

[in Japanese], [in Japanese]

1951 Volume 2 Issue 1 Pages 21-26
Published: July 01, 1951
Released on J-STAGE: June 12, 2009

DOIhttps://doi.org/10.11410/kenbikyo1950.2.21

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On a Slit for Objective Electron-Lens

Tadatoshi Hibi, Shoichi Takahashi

1951 Volume 2 Issue 1 Pages 27-29
Published: July 01, 1951
Released on J-STAGE: June 12, 2009

DOIhttps://doi.org/10.11410/kenbikyo1950.2.27

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Relative resolving power of electron microscope using Ag, Cu, brass, Al etc. for slit material of objective electron-lens was determined from degree of roundness of corners of MgO crystal. Each slit was 9/100 mm thick and 1/10 mm dia.
It was found that (i) Ag slit had the best resolving power (ii) lowering of resolving power due to contamination of a slit was mainly attributed to the disturbance of electrostatic field by charge up of electrons, and also (iii) Au slit was the most suitable one for continuous working of electron-microscope.

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Electron Microscopic Study of Lapping

Noboru Takahashi, Toshio Asaeda

1951 Volume 2 Issue 1 Pages 30-32
Published: July 01, 1951
Released on J-STAGE: December 09, 2009

DOIhttps://doi.org/10.11410/kenbikyo1950.2.30

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The intrinsic nature of lapping operation consists in a minute cutting action in wet lapping and a surface flow in dry lapping. In wet lapping the surface is yet crystalline; the operation is carried out by the abrasive particles embedded in the lap and those rolling and splitting between two frictional surfaces. In dry lapping the surface is generally amorphous and the operation progresses by the abrasive particles only embedded in the lap. Chips then produced become more and more minute in the progress of operation and their mean size amounts to 0.02 μ at the final stage.

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On the Character of a Current Stabilizer

Kanjiro Takahashi

1951 Volume 2 Issue 1 Pages 33-35
Published: July 01, 1951
Released on J-STAGE: December 09, 2009

DOIhttps://doi.org/10.11410/kenbikyo1950.2.33

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This paper gives the analysis or a simple degenerative current stabilizer circuit commonly used in exciting current sources for electron microscopes.
Upper limit of the stabilizer action are derived, and a few methods to improve the action are described.

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The Electric Field and the Focal Length of Static Electron Lens

(Including Asymmetric Lens)

Seiichi Wakaki

1951 Volume 2 Issue 1 Pages 36-38
Published: July 01, 1951
Released on J-STAGE: June 12, 2009

DOIhttps://doi.org/10.11410/kenbikyo1950.2.36

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The electric fields in the static electron lens, including an asymmetric lens, are calculated more accurately than ordinary methods by employing the mirror image method. Adopting the fields thus calculated the electron path, focal length and focal point are calculated. Further, new conventional method to calculate the chromatic abberation coefficients are also repo ted.

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On the Fresnel Fringes in the Electron Microscope Images

Nozomu Morito

1951 Volume 2 Issue 1 Pages 39-41
Published: July 01, 1951
Released on J-STAGE: June 12, 2009

DOIhttps://doi.org/10.11410/kenbikyo1950.2.39

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Eresnel fringes in the electron microscope imag's have been theoretically investigated.
In the present paper Fresnel fringes at the parallel illumination and the influences of the variation of the accelerating voltage and the angular aperture of illumination on Fresnel fringes are calculated. Angular aparture of illumination as well as voltage variation prevents clear appearance of Fresnel fringes. It is expected thct the aberrations of the objectiva may have same influences. Though Fresnel fringes are undesirable, they can be used to measure the resolving power of the electron microscope and the astigmatism of the objective.

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Grains of so-called Greenish Photographic Emulsion

Yasushi Oyama

1951 Volume 2 Issue 1 Pages 42-43
Published: July 01, 1951
Released on J-STAGE: June 12, 2009

DOIhttps://doi.org/10.11410/kenbikyo1950.2.42

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Sizes and shapes of silver halide grains of so-called "greenish emulsion" and its developed silver grains, were examined under electron microscops.
Undeveloped grains of this emulsion are almost comparable with (or even smaller than) those of Lippmann plate, and developed silver grains, even in case of strong development with uretol-hydroquinone, arc very fine (about 20mμ in me n diam ter) and have granular from, not worm- or thread-like as Lippmann plate.
From this remarkable character, it is inferred that the emulsion of this type will be more suitable for making super fine grain sensitive materials.

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Electon Microscopic Studies on the Bacterial Viruses

Masanaka Terada

1951 Volume 2 Issue 1 Pages 44-46
Published: July 01, 1951
Released on J-STAGE: June 12, 2009

DOIhttps://doi.org/10.11410/kenbikyo1950.2.44

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For years we have been taking up the study of viruses by the electron microscope, and we succeeded in verifying by our systematic studies on Bacterial Viruses (Bacteriophages) such as those of S. dysenteriae, S. enteritidis (Gartner), S. paratyphi A and B. E. typosa, S. typhi murium, S. cholerae suis, S. sendai, S. gallinarum and S. abortus, equi. We have inquired into the morphology of the viruses and the relations between bacterial virus and the host cell: especially in regard to the multiplication way of virus which has been considered as one of the fundamental problems on virus study, having, been remaining unditermined up-to-date, we could get some interesting results.

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On the Structure of Membrane of Red Blood Cell and its Physico-chemical Properties

Tatehiko Tanno

1951 Volume 2 Issue 1 Pages 47-49
Published: July 01, 1951
Released on J-STAGE: June 12, 2009

DOIhttps://doi.org/10.11410/kenbikyo1950.2.47

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From the electron microscopic studies on the membrane of red blood cell, it is assumed that the membrane of red blood cell is composed of two kinds of colloida layers. (Fig. 2 and Photo. 1-4)
It is considered that haemolytic process and permeability of red blood cell are dependent on the colloidal structure and the colloidal state of red cell membrane, which are controlled by the cornpositon of solutes in surrounding medium.

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Electron Microscopic Studies on the Human Tooth Structure

Hidetsugu Tsuchikura, Shozaburo Takuma

1951 Volume 2 Issue 1 Pages 50-52
Published: July 01, 1951
Released on J-STAGE: June 12, 2009

DOIhttps://doi.org/10.11410/kenbikyo1950.2.50

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The microstrucutures of human tooth enamel "and dentine which are reveald on the methylmethacrylate aluminium replicas are descrived in this paper. In conformity with these finding findings, a destructive mechanism of enamel surface caused by the dental caries is discussed, and some typical electron micrographs are presented to demonstrate the various stages of enamel caries.

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The Cellular Physiological Research on the Hemolysis 1st Report On the Type of the Hypotonic Hemolysis

Masando Man-i

1951 Volume 2 Issue 1 Pages 53-55
Published: July 01, 1951
Released on J-STAGE: December 09, 2009

DOIhttps://doi.org/10.11410/kenbikyo1950.2.53

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The hemolysis in the distilled water are classified in three types by the investigation under the phase contrastand electron microscope.
I type: Content of erythrocytes burst out from a large hole. Their membrane seems to be homogenous, and remains in folds and ruptured lines.
II type: Cytoplasm flows out from several holes. The plasma membrane appear generally homogenous, and there are several holes and occasional folds.
III type: The protoplasm vozes uniformly out from all parts of the cell area. The membrane shows the meshy appearance and the granular structure.
Even in the membrane of I and II type, the granular structure is sometimes seen.
The condition csused to those three tunes were seemed to be follows.
1) Speed of the osmotic action. 2) Nature of the red blood cells. 3) Conditions of medium.

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Electron Microscopic Investigation on the Isolated Chromatin Thread

Yasuichi Mizuta

1951 Volume 2 Issue 1 Pages 56-58
Published: July 01, 1951
Released on J-STAGE: June 12, 2009

DOIhttps://doi.org/10.11410/kenbikyo1950.2.56

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The thread-like bodies isolated from human leucocyte nuclei and carp erythrocyte nuclei have been investigated by means of the electron microscope and with the aid of microchemical stainings.
1. The thread-like bodies are composed of two kinds regarding the density to the electron beam, that is, the proximal opaque chromatin granules and the distal less opaque thread.
2. The chromatin thread is camposed of a pair of small coiled chromonemata which are coalesced into a double-stranded or pseudosinglestranded spiral which frequently gives a triple helix.
3. The chromonemata is consisted of at least four chromofibrils of approximately 5-10 mμ in diameter.

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