Denshi kenbikyo
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Volume 1, Issue 2
Displaying 1-15 of 15 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1950 Volume 1 Issue 2 Pages 71-77
    Published: October 01, 1950
    Released on J-STAGE: June 12, 2009
    DOIhttps://doi.org/10.11410/kenbikyo1950.1.71
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese]
    1950 Volume 1 Issue 2 Pages 78-85
    Published: October 01, 1950
    Released on J-STAGE: June 12, 2009
    DOIhttps://doi.org/10.11410/kenbikyo1950.1.78
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  • Photographic Action with Electron Radiation
    Mataichi Tajima
    1950 Volume 1 Issue 2 Pages 86-91
    Published: October 01, 1950
    Released on J-STAGE: June 12, 2009
    DOIhttps://doi.org/10.11410/kenbikyo1950.1.86
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    Bringing together results of our investigation on high sensibility emulsion for electron with fine grain and of some examination on photographic action for practical use, this paper is described mainly on some factor of the sensibility, particles of the developed silver and the resolving power in photographic phenomena ofelectron, in comparison with optical action.
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  • Electron-photographic Changes of Membrane of Red Cells
    Tatehiko Tanno, Yosihisa Kobayashi, Gentaro Saito
    1950 Volume 1 Issue 2 Pages 92-94
    Published: October 01, 1950
    Released on J-STAGE: June 12, 2009
    DOIhttps://doi.org/10.11410/kenbikyo1950.1.92
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    Electron microscopic images of membranes of red cells which are hemolysed in various media are in different ways and respectively characteristic. Colloidal system of the membrane of the cell hemolysed in distilled water is disordered, so that a meshy appearance comes out over the cell area. A more advanced stage of these changes is observed in case that HgCl2 crystal is directly applied to non-hemolysed red cell and in acid solution. Images of Membranes in alkali-solution are dim. When the red cells are treated in Ringer's Solution, homogeneous structure of images are obtained and it would be seen to be near the normal.
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  • On the Infective Agents of Trachoma and Vaccinia
    A special Study by Electron Microscopy
    Yozo Sugita, Shinichiro Sugita
    1950 Volume 1 Issue 2 Pages 95-97
    Published: October 01, 1950
    Released on J-STAGE: June 12, 2009
    DOIhttps://doi.org/10.11410/kenbikyo1950.1.95
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    1) The trachoma viruses, taken out purely from the human trachomatous tissues by differential ultracentrifugation, appeared on electron microscopic photographs as round granules about 130-170 millimicron in diameter.
    2) The vaccinia viruses, taken out from the inoculated rabbit testes and troated similarly, appeared on the photographs likewise as round granules about 180-140 milli micron in diameter.
    3) The viruses, of both the trachoma and vaccinia, were often accompanied with capsule-like attachments, which mainly consist of protein and are supposed to form a condition similar to protective colloid for the virus particles.
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  • Electron Microscopic Investigation on the Fine Structure of Muscular Tissue
    PartII. The Cardiac Muscle
    Kyugo Sasagawa, Taizo Hosomi
    1950 Volume 1 Issue 2 Pages 98-100
    Published: October 01, 1950
    Released on J-STAGE: December 09, 2009
    DOIhttps://doi.org/10.11410/kenbikyo1950.1.98
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    The material from the myocard of rabbit ventricule, treated with 10% Formalin alcohol solution more than 24 hours, not stained and mashed in the agar mortar for 30 to 60 minutes very slowly was examined under the electron microscope.
    The finest fibrous elements as seen with the electron micrographs are the protomyofibrils, ranging in width from about 20 to 50mμ and in which dense particles a little irregularly arranged. Electron micrographs show that myofibrils about 1μ in width possess the beautiful striated figures.
    The smallest particles of the sarcoplasm were observed as about 15 to 30mμ granules, and various granules, ranging 50 to 100mμ, 500 to 1000mμ in size, tied with protoplasmic filaments one another or aggregated in several numbers were too revealed.
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  • Effect of Strain Rate on the Slip Bands of Aluminium Single Crystals
    Hideo Nishimura, Jinichi Takamura
    1950 Volume 1 Issue 2 Pages 101-103
    Published: October 01, 1950
    Released on J-STAGE: June 12, 2009
    DOIhttps://doi.org/10.11410/kenbikyo1950.1.101
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    (1) Striking differences between the crystals subjected to the slow rate of strain in the order of creep and to the relatively rapid rate of strain can be found to observe at room temperature : i. e., the former has the wider slip bands, larger spacings between slip bands, fewer number of slip planes which concerned actually with gliding, and X-ray asterism more distinct than the latter. And the latter has also the tendency to form easily the twin texture after annealing.
    (2) From many electron-micrographs, the formation of slip band seems to be as follows ; short range slip region of stringlet form→longe range slip region of platelet form-→slip band. On the surface of test piece the stringlet region looks like a spot figure and the platelet region like a shorter band figure than the ordinary slip band.
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  • Studies on the Application of Replica Technique for Electron-microscopy
    Hidetsugu Tsuchikura
    1950 Volume 1 Issue 2 Pages 103-107
    Published: October 01, 1950
    Released on J-STAGE: June 12, 2009
    DOIhttps://doi.org/10.11410/kenbikyo1950.1.103
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    Many techniques for producing surface replica to be used in the transmission electron-microscope have studied by many workers. Briefly, applications of two-step replica process for various specimen are discribed in this paper. The process has utilize polimerized methylmethacrylate from monomer as the first replica and evaporated Aluminium as the second, thin film replica.
    Experimental process to surface observation has been disscused and respecting typical specimen surface, compared with its collodion one step replica.
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  • Study of the Illuminating System of the Electron Microscope
    Hideo Eto, Shigefumi Okada
    1950 Volume 1 Issue 2 Pages 107-110
    Published: October 01, 1950
    Released on J-STAGE: June 12, 2009
    DOIhttps://doi.org/10.11410/kenbikyo1950.1.107
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    Angular aperture of illumination is measured experimentally and the results are in good agreement with that of theoretical calculation of Borries and' Ruska.
    Area of illumination in specimen and relative intensities of electron beam in specimen are calculated from angular aperture experiments.
    Two sorts of photographs of multiple sources, which are considered to be one of the causes of multiple images, are obtained. One of these is due to electron emission or reflection at Wehnelt cylinder.
    Charging phenomena are observed explained by Rutherford's scattering theory.
    Propertied of lenses- are examined and we found that these properties satisfy Busch's formula.
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  • Studies on the Design of Magnetic Electron Lenses for Electron Microscope (II)
    Kazuo Ito, Tsugio Ito
    1950 Volume 1 Issue 2 Pages 111-112
    Published: October 01, 1950
    Released on J-STAGE: June 12, 2009
    DOIhttps://doi.org/10.11410/kenbikyo1950.1.111
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    We have already reported on the evaluation of focal strength, focal point, rotation angle, spherical aberration coefficient and chromatic aberration coefficient of the magnetic electron lens.
    Here a distortion coefficient is calculated and its result is compared witri electron micrograph of replica of optical diffraction grating.
    A discussion on the projection lens of electron microscope as regards distortion is described.
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  • Voltage Stabilization of the JEM-1 Type Electron Microscope Using the Radio Frequency High-Voltage Supplies
    Kanjiro Takahashi, Daisuke Karasawa
    1950 Volume 1 Issue 2 Pages 113-115
    Published: October 01, 1950
    Released on J-STAGE: June 12, 2009
    DOIhttps://doi.org/10.11410/kenbikyo1950.1.113
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    This paper outlined the performances of voltage stabilizers of the JEM 1 type electron microscope using radio frequency high-voltage supplies of which main power requiremant.are furnished by A. C. 200 volt line. These stabilizers maintain the high voltage constant below 0.01 percent at any moment assuming the variation of the A. C. line voltage to be ±20 percent.
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  • Experiment Concerning Replica Preparation Methods (I)
    Akira Fukami, Koichi Adachi, Shigeaki Nakagawa
    1950 Volume 1 Issue 2 Pages 115-119
    Published: October 01, 1950
    Released on J-STAGE: June 12, 2009
    DOIhttps://doi.org/10.11410/kenbikyo1950.1.115
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    This paper contents the analyse of the operation technique reliability and so forth of the each replica preparation method on a specific specimen, ever has been published, to meet each different needs. It is related the result of analysis there of and of the new method of using gelatine as a material of replica use.
    It is concluded as following. As concerning the reliability the Polystylene-Silica method surpassed the other methods examined. This fact is due to the effect of pressure (150kg/cm2) added during the procedure of this replica. The replica in which Si02 or Al is used as 2nd step replica, represent a different aspect from the image of our visual sensation. On the other hand, the image by a replica in which the synsetic resin, is similar to our visual one.
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  • Aberrations of Magnetic Lens having Bell-shaped Field with various Degree of Asymmetry
    Koichi Kanaya
    1950 Volume 1 Issue 2 Pages 119-122
    Published: October 01, 1950
    Released on J-STAGE: December 09, 2009
    DOIhttps://doi.org/10.11410/kenbikyo1950.1.119
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    The object of this paper is the improvement of the resolution of the electron microscope by means of magnetic lens having bell-shaped field with various degree of asymmetry.
    The author profoundly investigated the spherical constant and the chromatic aberration constant of this lens, and obtained that the desired degree of asymmetry are R1/R21/4 and R1/R2=1/1⋅5, where R1 R2 are the half field strength distances in the front and rear direction respectively, and in this case the spherical aberration and the chromatic aberration are minimum respectively.
    Hence, he obtained the results that the resolution can be made as small as 1 (mμ) by suitable choice of R1/R2.
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  • On the Single-Stage Electron Microscope
    Jiro Araki
    1950 Volume 1 Issue 2 Pages 122-124
    Published: October 01, 1950
    Released on J-STAGE: June 12, 2009
    DOIhttps://doi.org/10.11410/kenbikyo1950.1.122
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    A low-magnification single-stage electron microscope is described which holds a medium resolving power between that of ordinary electron microscope and light microscope. Unlike the conventional instruments, this microscope employs no projector lens which has been replaced by a light-optical enlargement.
    Some of the advantages are listed below:
    1. Wide area of the specimen is covered with a single micrograph.
    2. Magnification of images is directly measurable.
    3. Electron diffraction patterns are photographed with out transferring the specimen.
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  • Observation of the Structure of Selenium Photoelectric surfaces
    Masahiko Eguchi, Yasumasa Tani, Mitsuei Ikeya
    1950 Volume 1 Issue 2 Pages 124-127
    Published: October 01, 1950
    Released on J-STAGE: June 12, 2009
    DOIhttps://doi.org/10.11410/kenbikyo1950.1.124
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    The surface of Se photo-cell was investigated by means of the electron microscope and the Polymethylmetaclylate-Al replica method. It was found by the stereoscopic photography that the each grain of Se consists of minute buble-like mosaic crystals, varying their dimensions with the temperature and pressure at which they were treated, and that the surface of the mosaic crystal becomes flat, as the' pressure increases. The surface of Se cell sputtered with Cd was also observed, and found the Cd particles distributed uniformly when vacuum coated on the Se, but aggregate into the hexagonal crystals when evaporated on the collodion film.
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