巻号一覧
27 巻, 10 号
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経産卵巣における不産出卵の運命と新母卵細胞の形成本間 義治1961 年 27 巻 10 号 p. 873-880
発行日: 1961/10/25
公開日: 2008/02/29
ジャーナル フリーThe spent ovaries of Otu-nen Ayu that have survived in the rivers after spawning have been examined cyto-histologically.
The problems concerned are:
1. Morphological changes in the ovulation scar in the course of time.
2. The process of regression of unspawned eggs, and particularly, the collapse and ingestion of yolk attacked by the active granulosa or follicular epithelium, the persistence of the oolemma, and the development of atretic follicles.
3. The appearance and descent of young new oocytes found mainly in the hypertrophic lamellar membrane.
In the ovary of Ayu the corpora lutea are formed from granulosa both of post-ovulation (=vestige of ovulation) and of pre-ovulation eggs (=atresia of yolk-laden follicles), but production of yellow pigment granules in the ova cavities has not been recognized. It seems likely that the granulosa of pre-ovulation corpora lutea merely play a part in the destruction, transfer, and ingestion of yolk, since there is no clear indication of hormonal secretion.
The young ovarian eggs in the spent ovary seems to be new oocytes originating from the residual oogonia, but not the immature reserve-fund eggs nor younger ones reorganized by partial absorption of ooplasm. Whether or not these young oocytes can develop to mature functional eggs is undetermined.抄録全体を表示PDF形式でダウンロード (651K) -
能勢 幸雄1961 年 27 巻 10 号 p. 881-892
発行日: 1961/10/25
公開日: 2008/02/29
ジャーナル フリーThe extent of overestimation in the PETERSEN-type estimate of fish population size, caused by the recruitment occuring throughout the experiment, was analysed. Here, the type of recruitment was considered for two cases, i.e., a constant rate of recruitment which means that the ratio of recruitment to the size of fish population at each time is costant, (Table 1 and Fig. 1), and a constant size of recruitment which means that the size of recruitment in each period is constant, but the ratio of recruitment to the population size at each time is generally not constant (Table 2 and Fig. 2).
By using the tagged ratio method, it was easy to remove the bias in the PETERSEN-type estimate, caused by the constant rate of recruitment (Eqns. 16 and 17). But, the bias in the case of the constant size of recruitment was a little difficult to remove, except the case in which the relationship between time and the reciprocal of sample tagged ratio is approximately linear (Eqns. 22, 23 and 24).
The validity of these methods were ascertained by the bead-drawing experiment (Table 3, Fig. 3 and Fig. 4).
Moreover, the bias of the estimate by PETERSEN method when the tag diminution and the recruitment exist simultaneously will obviously be larger than the bias which occurs when they exist independently (Eqns. 28, 29 and 30).
It was possible to remove the bias of estimate, caused by the constant rate of recruitment and tag diminution occurring simultaneously, by the tagged ratio method (Eqns. 31 and 32). However, it was very difficult to remove the bias caused by the simultaneons occurrence of the constant size of recruitment and the tag diminution (Eqn. 34).抄録全体を表示PDF形式でダウンロード (656K) -
蒲生 英男1961 年 27 巻 10 号 p. 893-896
発行日: 1961/10/25
公開日: 2008/02/29
ジャーナル フリー1) Yolk protrusions into the plasmic layer covering the yolk were observed in sections prior to the blastula stage of a fresh-water teleost, the medaka, Oryzias latipes.
2) The phenomena are observed soon after the fertilization in the peripheral region of the plasmic layer and then the yolk material protruded is dislocated centripetally towards the central axis of the egg. This may be caused by the plasmic stream for the accumulation.
3) They are not observed at all at the 32-cell and the 64-cell stages and also no yolk material is visible in the plasmic layer. This suggests the conversion of the yolk to some other invisible materials, that is, the digestion.
4) In the morula and the blastula stages, they are observed both in the marginal and the subgerminal periblast.
5) Some sort of plasmic movement is suggested as a cause of this protrusion and further studies are expected.抄録全体を表示PDF形式でダウンロード (388K) -
蒲生 英男, 安良城 文生1961 年 27 巻 10 号 p. 897-902
発行日: 1961/10/25
公開日: 2008/02/29
ジャーナル フリー1) Behavior of periblast nuclei in the morula and the blastula stages of a freshwater teleost, the medaka, Oryzias latipes was observed in vivo and in sections.
2) They first appear in the early morula, 64-cell stage as free nuclei in the periblast.
3) They increase synchronously and mitotically until the blastula stage.
4) Their synchronism lasts longer than that of the division of blastomeric nuclei, probably because of their rather even environmental conditions compared with that of blastomeres.
5) Their mitotic division ceases at the blastula stage, suggesting a disturbance by the epibolic movement.抄録全体を表示PDF形式でダウンロード (647K) -
鈴木 乙彦1961 年 27 巻 10 号 p. 903-907
発行日: 1961/10/25
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (204K) -
ウレタン麻酔がフナ筋肉内燐化合物におよぼす影響中野 智夫1961 年 27 巻 10 号 p. 908-911
発行日: 1961/10/25
公開日: 2008/02/29
ジャーナル フリーIn the previous report1), the author pointed out that the contents of phosphorus compounds in the muscle of live fish were affected by ammonium ion, 7'P and CP being decreased while IP increased. The work described in the present paper was further undertaken to know the effect of urethan on the phosphorus compounds in fish muscle.
The results obtained are summarized as follows:
(1) Gibels became insensible to 0.5, 1.0 and 2.0% urethan solutions, after 2.5-3.0, 1.5 and 1.0min. of rearing in them, respectively.
(2) The muscle of fish narcotized by 0.5, 1.0 and 2.0% urethan respectively contained 1.1-2.4, 3.9-6.3 and 3.9-5.4mg% of 7'P more than that of control.
(3) There was remarkable difference in the post-mortem changes of 7'P and CP between the narcotized and control fish; namely fish narcotized by 1.0% urethan contained 0.5-15mg% of those compounds more than control in the course of 72 hours of storage at 0°C.抄録全体を表示PDF形式でダウンロード (236K) -
塩化ビニル製寒天簀使用による“ダンカン”防止効果について藤沢 浩明1961 年 27 巻 10 号 p. 912-918
発行日: 1961/10/25
公開日: 2008/02/29
ジャーナル フリーIn the previous papers1, 2), it was ascertained that the spoilage of “tokoroten” and agar during agar manufacturing in the mild winter results from the use of tainted reed mats in the process of freezing and drying and the disinfection of the reed mats with sodium hypochlorite solution is effective to prevent the spoilage.
It is considered by the author that the ordinary reed mat is easily tainted by the causative bacteria, but a plastic mat will not easily be tainted and its employment instead of the reed mat will consequently be effective to prevent the spoilage.
The present study was designed to ascertain the effect of the use of a mat made of polyvinyl chloride pipes and vinylon cords in preventing the spoilage of “tokoroten” and agar during agar manufacturing.
The results obtained are presented in Tables 2-5 and summarized as follows:
(1) The plastic mat is less easily tainted by the causative bacteria than the reed mat and its employment is appreciably effective in preventing the spoilage of “tokoroten” and agar.
(2) Though the plastic mat is not easily tainted, it becomes still spoilt in a greater or smaller degree when repeatedly put to use. Therefore, it seems still necessary to disinfect the mat after its use.
(3) In view of practical use, some improvements of the plastic mat are suggested.抄録全体を表示PDF形式でダウンロード (878K) -
土屋 靖彦, 鈴木 芳夫, 佐々木 劭1961 年 27 巻 10 号 p. 919-933
発行日: 1961/10/25
公開日: 2008/02/29
ジャーナル フリーIt is very difficult to keep dried laver without changes of color, flavor and taste for long periods of time at room temperature. In the present paper, the authors have examined various methods for the preservation of dried laver at 0°C and -20°C respectively. The results obtained are shown in Table 1 to 11.
The tables show that dried laver can be well preserved for long periods of time at low temperature. The vacuum sealing method and the sealing method using carbon dioxide at -20°C seem to be very useful preservation methods for dried laver as the color, flavor and taste do not deteriorate.抄録全体を表示PDF形式でダウンロード (932K) -
研究のあゆみおよび現状右田 正男1961 年 27 巻 10 号 p. 934-945
発行日: 1961/10/25
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (924K) -
1961 年 27 巻 10 号 p. 949
発行日: 1961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 (43K)
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