Nippon Eiseigaku Zasshi (Japanese Journal of Hygiene)
Online ISSN : 1882-6482
Print ISSN : 0021-5082
ISSN-L : 0021-5082
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Volume 20, Issue 1
Displaying 1-7 of 7 articles from this issue
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  • The imposed oscillating pressure method for measuring total respiratory flow resistance in human subjects
    Toshio Toyama, Jun Kagawa
    1965 Volume 20 Issue 1 Pages 1-4
    Published: April 10, 1965
    Released on J-STAGE: September 30, 2009
    DOIhttps://doi.org/10.1265/jjh.20.1
    JOURNAL FREE ACCESS
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    The principle of the imposed oscillating pressure method for measuring total respiratory flow resistance is based on the Mead's concept that an impedance of the mouth-chest system, simulated by an electrical equivalent circuit, represents the flow resistance when the reactance of the system is to be zero by imposing a sine-waved oscillating pressure with specific cycles into a bodyplethysmograph, in which human body is placed. The detailed procedure of the method for guinea pig was described in authors' previous report.
    The present paper describes in detail apparatus and procedure for measuring total respiratory flow resistance in human subjects.
    It is noted that, when the frequency of the sine wave is increased more than about 12 c.p.s., the impedance of the mouth-chest system is also increased.
    Without harming human subjects, this method permits rapid screening tests for measuring respiratory function in human subjects, when we use pertinent frequencies of the imposed pressure, i.e. from 8 to 10 c.p.s.
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  • Studies on Zinc in the drinking water
    Yukio Morikawa, Yoshito Masuda
    1965 Volume 20 Issue 1 Pages 5-10
    Published: April 10, 1965
    Released on J-STAGE: September 30, 2009
    DOIhttps://doi.org/10.1265/jjh.20.5
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    The drinking water applied to a group of apartment houses in Fukuoka City became white turbid when boiled or left in the air in a few days. To investigate this phenomenon, the water was analyzed by flame spectrophotometry and an animal experiment was carried out to see whether or not it is harmful to mice and goldfishes. The result obtained were as follows:
    1. The white turbidity of the water is caused by Zinc originating from the water pipe with Zinc lining.
    2. The white turbid sediments contained Zinc and other metals such as silica, calcium, magnesium and some others. This seemed to be one of the reason why a trace amount of Zinc as little as 1 ppm could cause an easily discernible turbidity in water.
    3. An eight weeks' observation demonstrated no significant difference in the increasing rate of body weight between the control group of mice and the experimental groups which were given water containing Zn as much as 160 ppm.
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  • Toxicity and metabolism of methyl mercury compounds in animals -especially in relation to Minamata disease
    Katsuro Irukayama, Fumiaki Kai, Takako Kondo, Sadao Ushikusa, Motoo Fu ...
    1965 Volume 20 Issue 1 Pages 11-21
    Published: April 10, 1965
    Released on J-STAGE: September 30, 2009
    DOIhttps://doi.org/10.1265/jjh.20.11
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    In order to explain the significance as the causative agent of Minamata disease of methyl mercury chloride which was extracted from the sludge in the reaction tube in the acetaldehyde plant of Minamata Factory and from the shellfish in the Minamata Bay, methyl mercury chloride and other methyl mercury compounds which are able to be derived from methyl mercury chloride were synthesized, and the toxicity and the chemical properties of mercury compounds accumulated in organs of animals administered with those methyl mercury compounds were observed.
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  • A study of the river pollution
    Nozomi Takemura, Chise Nakajima, Takashi Akiyama, Chin-Lu Kuo, Yukio Y ...
    1965 Volume 20 Issue 1 Pages 22-25
    Published: April 10, 1965
    Released on J-STAGE: September 30, 2009
    DOIhttps://doi.org/10.1265/jjh.20.22
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    River pollution as public nuisance is a very serious problem today. There are many factories along the Sumida River and the Shinkashi River, in Tokyo, which flows into the upper stream of the former. The Sumida River is especially contaminated by chemical factories, which discharge highly polluted wastes. Among these factories are dye- and pigment-factories, which discharge wastes containing dye or pigment itself and dyestuff intermediates.
    The aromatic amines in the water at certain places along the Sumida River were investigated, and it was found that it contained 0.205-0.562 ppm of aromatic amines in the water, such as carcinogenic amines, benzidine, dichlorbenzidine, α-naphthylamine and β-naphthylamine.
    From the result of this investigation, it has been considered that pre-treatment plants for purifying wastes should be installed quickly.
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  • Studies on the function of concentration maintenance (TAF) -Discussion on three-minute method of the TAF-test-
    Kiyoo Matsui, Hiroshi Sakamoto, Tetsuji Kojima, Eimatsu Takakuwa, Hiro ...
    1965 Volume 20 Issue 1 Pages 26-33
    Published: 1965
    Released on J-STAGE: August 10, 2010
    DOIhttps://doi.org/10.1265/jjh.20.26
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    The function of concentration maintenance (TAF), the concept of which was presented by Takakuwa in 1960, is originally described as TAF-L and TAF-D computed from the standardized curve in three-minute method of the TAF test. A number of studies on TAF showed that the changes of TAF-L and TAF-D were corresponding to the degree of fatigue resulting from work, especially characterized by mental stress. Another experiment demonstrated the close correlation existing between TAF and the autonomic nervous balance. However, the central nervous functions are very complicated and multifactorial, so that the observations have been advanced as to what the TAF-L and TAF-D in three-minute method are indicated.
    The present studies were devided into three series. The first one consists of original three-minute method, then rest for five minutes and aiming for five minutes, then rest for one minute and aiming for three minutes. For the second, aiming for three minutes and rest for thirty seconds are repeated six times, and continuous aiming for eighteen minutes is given on the other day. The third one is the measurement of galvanic skin reflex in parallel with the original three-minute method. The results of these observations suggested the following points:
    1) TAF-L in three-minute method indicates the process of the body to be brought into the status of concentration maintenance.
    2) There are large individually characteristic differences in the processes to the status of concentration maintenance, some one quick and some other slow.
    3) The duration of concentration maintenance, which is the total duration of aiming level better than 2.5 in standardized curve, is significantly correlated with the value of L in continuous aiming.
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  • Erratum
    1965 Volume 20 Issue 1 Pages 39b
    Published: 1965
    Released on J-STAGE: September 30, 2009
    DOIhttps://doi.org/10.1265/jjh.20.1_39b
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  • Erratum
    1965 Volume 20 Issue 1 Pages 39a
    Published: 1965
    Released on J-STAGE: September 30, 2009
    DOIhttps://doi.org/10.1265/jjh.20.1_39a
    JOURNAL FREE ACCESS
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