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Volume 22, Issue 5
Displaying 1-11 of 11 articles from this issue
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Yongjunn PACK1956 Volume 22 Issue 5 Pages 275-278
Published: September 25, 1956
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSThis study was attempted to investigate the coating effect of the wooden float. Three kinds (following A, B, C) of wooden pieces made of paulowania, Japanese cypress and birch being used commonly as the wooden float were selected, and five pieces were employed to each run as the test pieces.
A. The wooden pieces dried in an oven for 3 hrs at 100°C after being cut into a dimension of 10×10×20mm3.
B. The wooden pieces coated with synthetic resin paint five times for the test pieces-A.
C. The wooden pieces impregnated, for 5 hrs under pressure of 5 atm by a compressor, with low condensation phenol resin which has resin content 20.2%, specific gravity of 1.060 and specific viscosity of 2.49, then coated by the same method as in the case of the test pieces-B.
Table 1 shows the weight of synthetic resin which coated the test pieces-B and-C and of the resin impregnated in the test pieces-C.
The test pieces treated by the above mentioned methods were then allowed to soak in the sea water the temperature of which was regulated at 30°C, and then absorption of water was measured by the increment of weight.
The amount of absorbed water W after being soaked for t hours may be represented by the following emprical expression;
W=WI(1-e-α1t)+WII(1e-α2t)
where WI, WII, α1 and α2 are constant.
The difference of the mode of absorbing process with the treatments can be seen in Fig. 1 and Table 2.
1. The coating effect of the test pieces treated only with synthetic resin paint or both the resin paint and the resin was effective distinctively as compared with the untreated ones.
2. An appreciable effect due to impregnation could not be seen, but this treatment caused shrinkage and warpping of the test pieces.
3. All the untreated test pieces sunk thoroughly within a month after soaking, but the treated ones were floating during three months under this experiment.View full abstractDownload PDF (294K) -
Akira OCHIAI1956 Volume 22 Issue 5 Pages 279-283
Published: September 25, 1956
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSThe growth differentiation found among 19 Japanese soles obtained from southern part of Japan is quantitatively viewed with several biological aspects.
At the age of 3 years, the body reaches 100mm or even becomes longer in the fishes belonging to the subfamily Synapturinae, but in those of the other subfamilies of Soleidae (Soleinae and Achirinae) it is usually shorter. In the family Cynoglossidae, the members of the subfamily of Cynoglossinae attain on the whole more than 100mm in the body length, whereas the fishes of the Symphirinae never reach 100mm.
According to extremity body length calculated by the difference diagram, each of the tropical, subtropical and temperate forms is clearly divided into 3 groups. But the tropical form is always more or less longer than the others (Fig. 3). It also seems probable that in the same genus the species originated in the tropical ocean have a longer body than the endemic ones of Japan and China (i.e.: Zebrias zebra-Z. japonicus, Aseraggodes kaianus-A. kobensis, Symphurus strictus-S. orientalis).
There is a tendency in this group that the higher counts anal soft rays the fish has, the larger the body becomes.View full abstractDownload PDF (334K) -
Masaya KOSAKA1956 Volume 22 Issue 5 Pages 284-288
Published: September 25, 1956
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSThe indiuidual fish of Limanda yokohamae was liberated one by one from a definite position into the experimental pool, whose bottom was provided on one side with the fine sand and the other side with the small gravel, each in half space.
The number of individuals settled on either the sand or the gravel bottom was counted at each time of the liberation. The same was done by the different species, Kareius bicoloratus.
The results showed that, when the population density is low, both the species tend to settle on the side of sand than gravel; however, with the increasing density, the tendency of preference for the sand gradually falls. (Figure 1)
Namely, the probabilities for the settlement on the sand are high at the lower density and decrease as the density becomes higher.
In order to find out the relationship between the habitat preference and the population density, MORISITA'S theory on the environmental density and probability formula derived from its theory were applied for the analysis of the results of this experiment. The frequency distribution of the number of individuals settled on the bottom of the tank were conicident well with the expected values calculated by MORISITA'S formula for both the species (Tables 2 & 3).
The values of the environmental density (expressed as the population density) were 0.10 for the sand and 3.10 for the gravel in the case of L. yokohamae and 0.22 for the sand and 1.95 for the gravel in the case of K. bicoloratus.View full abstractDownload PDF (357K) -
Swelling and Elastic Behavior of Thermally Contracted Dried Cuttle-FishAkira KISHIMOTO, Kaoru MITSUHASHI, HIROSHI FUJITA1956 Volume 22 Issue 5 Pages 289-292
Published: September 25, 1956
Released on J-STAGE: February 29, 2008
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Analysis of Elastic Behavior of Thermally Contracted Dried Cuttle-FishAkira KISHIMOTO, Hiroshi FUJITA1956 Volume 22 Issue 5 Pages 293-296
Published: September 25, 1956
Released on J-STAGE: February 29, 2008
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Stress-Relaxation in Dried Cuttle-FishAkira KISHIMOTO, Hiroshi FUJITA1956 Volume 22 Issue 5 Pages 297-300
Published: September 25, 1956
Released on J-STAGE: February 29, 2008
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Application of RIVLIN's Method to the Rupture of KamabokoKazuhiko NINOMIYA1956 Volume 22 Issue 5 Pages 301-305
Published: September 25, 1956
Released on J-STAGE: February 29, 2008
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Heat Conductivity of Fresh Fish MeatsHiroshi FUJITA, Akira KISHIMOTO1956 Volume 22 Issue 5 Pages 306-310
Published: September 25, 1956
Released on J-STAGE: February 29, 2008
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Rigidities of Agar HydrogelsYasuo MIKI, Kazuhiko NINOMIYA1956 Volume 22 Issue 5 Pages 311-315
Published: September 25, 1956
Released on J-STAGE: February 29, 2008
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Preparation of Histidine from Pyloric Coeca ExtractDaiichi KAKIMOTO, Hiroshi MIZUMA1956 Volume 22 Issue 5 Pages 316-319
Published: September 25, 1956
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSIn order to prepare the histidine from the extract in pyloric coeca of skipjack, Japanese acid clay was used as adsorvent. adsorbed histidine was eluted from acid clay and precipitated with Hopkins-Cole reagent.
The yield of histidine thus obtained corresponded to 64 per cent by the bioassay value.View full abstractDownload PDF (737K) -
Preparation of Arginine from Pyloric Coeca ExtractDaiichi KAKIMOTO, Tetsuro YOSHIMINE1956 Volume 22 Issue 5 Pages 320-323
Published: September 25, 1956
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSIn the isolation of arginine from extractive matter of pyloric coeca, it is necessary to find means for elimination of agmatine. Basic nitrogen compounds containing arginine and agmatine were separated from other matters by the treatment with activated charcoal at pH 8.0 followed by the elution with HCl-acetone. After removed of acetone the residue was treated with picric acid, almost all the agmatine being precipitated. After filtyering off the agmatine picrate, arginine was precipitated as its flavianate, and finally purified as the hydrochloride. The yield of arginine thus obtained corresonded to 76% by the bioassay value.View full abstractDownload PDF (877K)
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