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Volume 1 (1988)
- Issue 2 Pages 83-
- Issue 1 Pages 9-
Volume 1, Issue 1
Displaying 1-5 of 5 articles from this issue
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[in Japanese]1988 Volume 1 Issue 1 Pages 9-19
Published: June 30, 1988
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1758K) -
Hiraku TAKEBE1988 Volume 1 Issue 1 Pages 21-29
Published: June 30, 1988
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSInvolvement of genetic factors in the effects of environmental changes on human health has been clearly demonstrated in the development of skin cancer in the patients with xeroderma pigmentosum (XP). XP is an autosomal recessively inherited hereditary disease assoicated with the high incidence of skin cancer. Clinical, genetic and DNA repair characteristics of 262 XP patients in Japan have been investigated in comparison with those in other countries. Development of skin cancer was found to be closely related to the DNA repair defects in the cells of XP patients . There are similarities between mutation and cancer by UV in XP, and DNA repair should play an important role in the processes leading to mutation or cancer . Similar involvement of genetic factors has also been suggested in other cancer-prone hereditary diseases . Although direct evidence has been limited to the patients with these diseases, genetic factors should affect any processes related to the DNA damages and their expression, which are very common in the effects of environmental changes on human bodies.View full abstractDownload PDF (1333K) -
Satoshi YOSHIDA, Masami ICHIKUNI1988 Volume 1 Issue 1 Pages 31-38
Published: June 30, 1988
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThis paper describes the role of canopy of different tree species in the collection of selected airborne elements, including Al, Fe, Ca, Mg, K, NO3- and SO42- Bulk throughfall was collected in the forest located in the suburban area of Yokohama. Bulk precipitation was also collected in an open area outside of the forests studied. The interception deposition rate, estimated by subtracting bulk precipitation from bulk throughf all, depended on the tree species and increased in the following order : Quercus acutissima-Q. serrata<Quercus myrsinaefolia<Cryptomeria, japonica. The ratios of interception deposition to bulk precipitation varied from 0.5 to 2.0, suggesting the importance of interception deposition to the atmospheric input of the above chemical species to the forest. A discussion was developed on the possible leaching of Ca, Mg and K from the canopy. The leached amounts of Ca, Mg and K from the canopy were estimated by assuming that Al was totally of the external origin, being not leached from leaves. The results showed that the leaching from the canopy increased in the order of Mg<Ca<K. In case of the forest of Quercus acutissima-Q. serrata, 72% of K in bulk throughfall was accounted for by the leaching.View full abstractDownload PDF (2107K) -
Hlsao OHTAKE, Pi-Chao WANG, Kiyoshi TODA1988 Volume 1 Issue 1 Pages 39-46
Published: June 30, 1988
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSA stochastic model was proposed to estimate the extinction probability of plasmid-carrying bacteria after released into a natural environment. The limiting extinction probability P0∞ was given by three dimensionless parameters η, ζ and θ. The parameters η and ζ represented the abilities of released carriers to grow and transfer their plasmids in the environment, respectively. θ was interpreted as the index of selective advantage for indigenous carriers. The contour maps of P0∞ were illustrated on the η-ζ plane when the value of θ was given. It was shown that the complete extinction (P0∞=1) could occur provided that θ>1, η ≤1 and ζ=0 or θ≤1 and, η≤1.View full abstractDownload PDF (814K) -
[in Japanese]1988 Volume 1 Issue 1 Pages 47-56
Published: June 30, 1988
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1237K)
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