巻号一覧
21 巻, 3 号
選択された号の論文の16件中1～16を表示しています
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小泉 孝1955 年 21 巻 3 号 p. 139-140
発行日: 1955/07/25
公開日: 2008/02/29
ジャーナル フリーThe 2/4 and 3/6 netting cords were made with 210D (×15 filaments) Amilan yarns of 50cm. long, and the tensile strength, the diameter and the shrinkage were measured in the case of various twist.
From the results (Figs. 1, 2 and 3), we know that (1) there is the maximum tensile strength in case the upper (N) and lower (n) twists are in balance, and this maximum value diminishes, but indistinctly, when the lower twist increases over 100, and that (2) the upper and lower twists in balance, follow the next formulae,
2/4:N=245(1-0.630n/100) 3/6:N=215(1-0.620n/100).抄録全体を表示PDF形式でダウンロード (85K) -
宮本 秀明, 高山 博充1955 年 21 巻 3 号 p. 141-153
発行日: 1955/07/25
公開日: 2008/02/29
ジャーナル フリーPervious works on the wearing process of netting threads were concerned in friction of thread against solid matters.1-3) In the present study, the friction between threads of a fishing net itself has been pursued in an attempt at minimizing possibility of ripping damage by improving seaming and other techniques, if any, of netting fabrication.
A modified Duplan wear tester used for the experiment had a wooden ridged runner on which was mounted one of the sample threads, a (Fig. 1). Another thread b was tightly stretched across a by means of a weight w of 500g hanging through pulleys at the end of b. The runner was made to move back and forth on the rails at 24cm/sec with an amplitude of 4.7cm on both side, the threads being rubbed against each other. For wet test, the threads soaked in water were placed beneath a dripping pan. The wearing process of threads was examined by determining the breaking strength of thread a which was reduced according to the increasing numbers of friction until it was splitted by friction under the same tension. The numbers of continuous friction under different loads effective of splitting therad a were tested by changing the weight within a range of 0.25 to 1.5kg. The sample threads consisted of both vegetable and synthetic fibers of various kinds as indicated in Tables 1 and 5; the ranges of temperatures during the test are in Tables 2 and 6.
The results of the tests revealed:
Dry threads of vegetable fibers, such as cotton and ramie, are very resistable against frietion. But when moistened, the durability is reduced for about one quarter of the dry state ( ?? ables 3, 4 and Figs. 2, 3).
In case of synthetic fibers the durability is just in reverse of vegetable fibers as they are found weak when dry but strong when watered. Different durabilities are quite noticeable depending on kinds of synthetic fiber. Threads of polyamid compound are the strongest, while wet threads of polyvinyle compound equal in strength with that of vegetable fiber. Those of vinylidene-chloride are the least durable against friction (Tables 3, 4 and Figs. 2, 3).
In the test of temperature affecting the durability carried out with polyvinyle and vinyli-dene-chloride, a remarkable difference was found depending on temperatures of dripping water. The drips of water at 5°C made the threads about two times more durable than those watered at 20°C. The relationship between w, the tensive weight of the thread b, and n, the number of friction capable of splitting thread a, may be expressed roughly in hyparbolic curves (Fig. 6). But in most ca ?? es of thread, except ramie, the greater the n, or the smaller the w, the greater amount of friction, wn, is required for splitting the thread a (Fig. 7).抄録全体を表示PDF形式でダウンロード (713K) -
落合 明, 浅野 博利1955 年 21 巻 3 号 p. 154-158
発行日: 1955/07/25
公開日: 2008/02/29
ジャーナル フリーIt is presumed that fish behavior against a fishing net, is more or less influenced by the sociality of a school of fish. In the present experiment, the habits of the Japanese minnow (Orizias latipes) are tested as they pass through various kinds of meshes (0.5, 1.0, 1.5 and 2.Ocm.) individually, and in schools of 3, 5 and 10 fishes respectively.
In solitary, the fish is very cautious, and if the mesh is smaller than 1.0cm. it does not approach the net. But when the mesh is larger than 1.5cm. the fish readily approaches and goes through the net.
Fishes forming a school, however, do not take so much care of the net as solitary, and approach the net although the mesh is small. The intercepting effect of a net disappears when the mesh is 1.0cm. for schools of 5 and 10 fishes, and 1.5cm. for a school of 3. It is also observed that the leader fish of a school is apt to pass the net more quickly and easily than a fish left alone in any kinds of meshes.抄録全体を表示PDF形式でダウンロード (374K) -
暗黒に慣らされた魚に対する諸種の光の影響前田 弘1955 年 21 巻 3 号 p. 159-163
発行日: 1955/07/25
公開日: 2008/02/29
ジャーナル フリー1. Lights of various intensities and colours were shed on the aqualium in which 10 young individuals of dark-adapted Girella punctata GRAY were kept.
2. The out-line and the size of the aqualia and the positions of lights are shown in Fig. 1. In order to make possible to avoid the beam, during the experiment each aqualium is illuminated only at a half.
3. Lights, 5 grade of intensities and 6 colours, are used.
4. Individuals of Girella punctata used for these experiments are scattered almost every part of the aqualium in the day time or at night showing more or less territorial behaviours and do not form conspicuous shoal.
5. Number of individuals observed in each part of the aqualium in each case 30min. after the lighting are shown in table 1.
6. Probabilities of occurance in the half part of the aqualium more than or less than n individuals among 10 individuals when they are scattered by chance are shown in table 2.
7. Probabilities of occurance of more than or less than n individuals in each three sub-part when the total number of individuals in the beam are scattered by chance are shown in table 3.
8. I wish to recognize the positive influence of the light upon the distribution of fishes when the probability of occurance less than the number of individuals actually observed in the dark half among 10 individual is less than 0.05 or when probability of occurance of individuals more than actually observed in the frontal sub-part is less than 0.05; the negative influence was desccrned in the case vice versa.
9. Influences of various lights appreciated on the above-mentioned criteria are summarized into table 4.
10. Frequency dstribution of number of individuals in sub-part is seems to be some exponential type.
11. Using analysis of variance on the values transformed into square root, it is clear that the difference of the light intensity causes the significant difference in the number of fishes in the frontal and middle sub-division of the illuminated half and in the other half of the aqualium, while the difference of the filter brings no significant change in the distribution of fishes.抄録全体を表示PDF形式でダウンロード (317K) -
窪田 三朗1955 年 21 巻 3 号 p. 164-167
発行日: 1955/07/25
公開日: 2008/02/29
ジャーナル フリーTwo cases of hyaline-droplets degeneration in the liver of male and female rainbow trout were obtained in the Trout Culture Experimental Station at Samegai, Shiga Prefecture. Both the cases were proved to be of pathological nature, one being, so to speak, ejective type and the other non-ej ?? tive type. The present report deals with the former.
Infected by a Monococcus, liver of the trout is troubled with a infectious disease resembling “furunculosis” and shows heavy degeneration of its tissue. Results of its examination by using several dyes are tabulated in the accompanying diagram. In entire liver, ?? ells are filled with droplets with various sizes which are rather variable in the rea ?? tion to dyes and different from those observed in higher vertebrates in nature of staining or others. On account of neoplastication of the droplets, cell outlines become indistinct and hepatic cell cords show a syncytial appearance. Droplets ejected from cells flow into blood vessels or invade superficial masses of colloidal substance. Stainability of the latter appears to vary in accord with the length of time elapsed since first ejection of droplets.
It appears to me, therfore, appropriate to diagnose the present case as “acute hepatitis with hyaline-droplets degeneration”.抄録全体を表示PDF形式でダウンロード (1005K) -
窪田 三朗1955 年 21 巻 3 号 p. 168-170
発行日: 1955/07/25
公開日: 2008/02/29
ジャーナル フリーThe present paper deals with a liver of female (rainbow trout) attacked with the infectious disease as in the same case described in my previous report. But here the disease is combined with hepatic haemorrhage resulted from artificial oviposition. Methods employed and the results are as in the previous case except for those shown in Table I.
In every portion of the liver, cells include many hyaline-droplets of various sizes showing in revial types a nature similar to those in that case. But here the hyaline-droplets are not ejected from cells to intrude into inter-cellular spaces.抄録全体を表示PDF形式でダウンロード (1380K) -
與謝内海,久美浜湾におけるマイワシ脊椎骨数の変動橘高 二郎1955 年 21 巻 3 号 p. 171-174
発行日: 1955/07/25
公開日: 2008/02/29
ジャーナル フリーThe fries of sardine are released artificially into the inlets, Yosanaikai and Kumihama Bay, in June or July every year. As there are naturally entered fry, they mingle each other and stay there growing for a while.
Accordingly, fished sardines in summer are considered to be composed of both naturally entered school and artificially released one.
Numbers of vertebrae were counted to estimate the process of mixture of both schools through the fishing period.
Results obtained are as follows.
1) The average vertebral number of Yosanaikai sardine is higher in the first period of fishing, and then successively it becomes lower till the middle period of fishing, owing to the increase of additional rate of released fish to the caught group.
2) In the Yosanaikai, the released fish were caught as a rate of 15% on total catch during the fishing season in 1954. The increasing rate of catch was more remarkable in Kumihama Bay, where naturally entered fries seem to be scarce.
3) Average vertebral number of sardine fries in Yosa naikai were found higher than that in thelast period of fishing. This indicates that the sardines reared in environments of low water temperature during the larval stage are able to stay in inlet waters of lower salinity for a long period.抄録全体を表示PDF形式でダウンロード (255K) -
水及びWEBER液で抽出したときの流動複屈折谷川 英一, 秋場 稔, 山下 二郎1955 年 21 巻 3 号 p. 175-178
発行日: 1955/07/25
公開日: 2008/02/29
ジャーナル フリーWhen the ?? meat ?? of sea cucumber is extracted repeatedly with water, the solutions which show streaming birefringence are obtained after the 4th extraction.
This fact was also observed in squid meat. In the case of squid meat, the substance which is responsible for the streaming birefringence is considered to be myosins extracted from the meat.
However, the appearance of streaming birefingence in the aqueous extract of sea cucumber ?? meat ?? is considered to be due to the presence of some other substances.抄録全体を表示PDF形式でダウンロード (283K) -
ナマコ肉抽出液の流動複屈折と抽出蛋白の電氣泳動的擧動谷川 英一, 秋場 稔, 山下 二郎1955 年 21 巻 3 号 p. 179-182
発行日: 1955/07/25
公開日: 2008/02/29
ジャーナル フリーThe substance which shows streaming birefringence in the water-extracted solution of sea cucumber meat is considered to be the suspended fibrous matter of collagen fiber, rather than to be some dissolved proteins. On the contrary, in the case of squid meat, substance which shows streaming birefringence is suggested by electrophoretic examination to be a dissolved protein (viz., myosins). The phenomenon of streaming birefringence in the extract of ?? ea cucumber meat should be discussed from the histological characteristics.抄録全体を表示PDF形式でダウンロード (289K) -
ナマコ肉水抽出液の流動複屈折の生因谷川 英一, 秋場 稔, 山下 二郎1955 年 21 巻 3 号 p. 183-186
発行日: 1955/07/25
公開日: 2008/02/29
ジャーナル フリーThe tissue of the edible part of sea cucumber is found to be the connective tissue of a network consisting of collagen fiber.
When the meat is extracted repeatedly with water, the connective tissue becomes deformed mechanically, and the collagen fiber comes into the solution in a suspended state. This suspended fibrous matter is ascertained to be the cause of the appearance of streaming birefringence.抄録全体を表示PDF形式でダウンロード (952K) -
着色度と原料脂肪皮に添加したHemoglobin量との関係向井 克憲1955 年 21 巻 3 号 p. 187-189
発行日: 1955/07/25
公開日: 2008/02/29
ジャーナル フリーThe author studied the relation betwen the coloration of whale oil and the amount of hemoglobin added to raw blubber. The results obtained were as follows:
(1) At the preparation of whale oil, he ob ?? ed that the contens of pyrrole ring, nitrogen, and iron in oil were increased when hemoglobin was added to raw blubber previously.
(2) The color of whale oil is largely due to the natural hemoglobin that is contained in blubber.
Looking at the fact that, the more conspicuously the color of aqueous layer on boiling raw blubber becomes, the more intensely colored the oil layer becomes, he recommends to separate the two layer from one another as quickly as possible.抄録全体を表示PDF形式でダウンロード (197K) -
着色度と原料脂肪皮に添加したPorphyrin核物質との関係向井 克憲1955 年 21 巻 3 号 p. 190-193
発行日: 1955/07/25
公開日: 2008/02/29
ジャーナル フリーAt the preparation of whale oil, the author carried out the experiments under equal cenditions except that each of samples had previously been added with increasing amounts of porphyrinic substances, hemin (Hm) or methyl ester of protoporphyrin (PME).
The results obtained were as follows:
(1) The color of whale oil is characterized by the amount of porphyrinic substances, viz. the color is deepened with the increase of added substances.
(2) It was found that, the higher the coloration of whale oil is, the larger its content of pyrrolic compound.
(3) The test of heating of porphyric substances experimentally in hot water the pyrrolic compound is not yielded.
From these results, the author presumed that porphyric substances usually present in raw blubb ?? r set free pyrrolic compounds, and the latter influences to the coloring of whale oil stock ?? when they are activated by oil.抄録全体を表示PDF形式でダウンロード (254K) -
ヒトデのビタミンB12について(其の二)簗瀬 正明1955 年 21 巻 3 号 p. 194-196
発行日: 1955/07/25
公開日: 2008/02/29
ジャーナル フリーSucceeding the previous report1), further studies have been pursued as to the vitamin B12 contents of the yellow starfish (Asterias amurensis Lütken*) and ether species.
The vitamin B12 contents of starfish, in the pyloric caecum, gonad or body wall, were determined by the microbiological assay using Eugiena gracilis.
Experimental results:
1. Seasonal variation of vitamin B12 contents of Ast. amurensis in TOKYO Bay was measured. The spawning season of this species was found to extend from January to April in that area, and the vitamin B12 level of the pyloric caecum in the individuals captured before spawning is much higher than that of those having completed spawning (Table 1).
2. Among various species investigated, Asterina pectinifera was found to be richest in vitamin B12 content in the pyloric caecum (Table 3).
1) M. YANASE: Bull. Jap. Soc. Fish., 19, 1200 (1954).
* The sientific name of the yellow starfish has been corrected as avobe, instead of Asterias
amurensis versicolor Sladen used in the previous report.抄録全体を表示PDF形式でダウンロード (192K) -
魚類の胃及び腸内容物のビタミンB12含量簗瀬 正明1955 年 21 巻 3 号 p. 197-200
発行日: 1955/07/25
公開日: 2008/02/29
ジャーナル フリーBy measuring vitamin B12 amounts of gastric and intestinal contents for various species of fish according to the bioassay using Euglena gracilis the following results were obtained:
1. In case of fishes listed in Table 2, vitamin B12 level of intestinal contents is much higher than that of gastric contents, suggesting that bacteria synthesize vitamin B12 in intestnal tract. The intestinal contents of such high B12 values may be considered as an important B12 source in manufacturing fish solubles from these fishes.
2. The intestinal contents of the fishes shown in Table 3 reveal no singificant increase in B12 level as compared with the gastric contents. It is presumed that vitamin B12 synthetic activities of the intestinal bacteria are only weak or absent in these fishes.抄録全体を表示PDF形式でダウンロード (248K) -
1955 年 21 巻 3 号 p. 200a
発行日: 1955年
公開日: 2008/04/22
ジャーナル フリーPDF形式でダウンロード (47K) -
1955 年 21 巻 3 号 p. 200b
発行日: 1955年
公開日: 2008/04/22
ジャーナル フリーPDF形式でダウンロード (47K)
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