巻号一覧
54 巻, 4 号
選択された号の論文の29件中1～29を表示しています
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吉川 弘正, 石田 義成, 上野 三郎, 満田 久輝1988 年 54 巻 4 号 p. 545-551
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーAs an anesthetic for long-term anesthesia, two concentrations of CO2 were used: a high concentration (Pco2 ?? 200, 225, or 250mmHg) for inducing anesthesia quickly and a low concentration (Pco2 ?? 100mmHg or 125mmHg) for maintaining anesthesia. Adult carp were kept in water containing the high or low concentration of CO2 for a total of 10h; the duration of each treatment was 15 min or 30 min at the high concentration and 1h or 9.5h at the low concentration. The time needed for the induction of anesthesia was shortened by the use of the high partial pressure of CO2 (Pco2 ?? 250mmHg). The carp could be anesthetized or sedated for 10h, using Pco2=250mmHg as the high concentration and Pco2=100mmHg as the low concentration of CO2.抄録全体を表示PDF形式でダウンロード (507K) -
谷口 順彦, 東 健作, 楳田 晋1988 年 54 巻 4 号 p. 553-557
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーFour progeny groups of red sea bream marked by isozyme gene were mixed with each other on the day of the hatching, and reared consistently in the same tank and same net-cage in order to adjust environmental effects on the growth of progeny groups. These progenies were sampled on 65th, 142nd, 232nd, 528th days after hatching, and then the parents of progenies were identified by isozyme markers. The significant differences were observed in growth and survival rate among the progeny groups on each sampling day. It was discussed that the difference among progeny groups might be caused by the maternal effects as well as genetic factors.抄録全体を表示PDF形式でダウンロード (400K) -
関 伸吾, 谷口 順彦, 田 祥麟1988 年 54 巻 4 号 p. 559-568
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーTen samples of amphidromous-form from Japan Islands, Ryukyu Islands, and Korean Peninsula, and three samples of landlocked-form from Lake Biwa were used for the population analysis of ayu Plecoglossus altivelis. Among 23 loci examined, 6 loci were polymorphic (lower than 0.95 in major allele frequency) in Japanese populations, 2 loci in Korean populations and 4 loci in Lake Biwa populations. The polymorphic locus of Ryukyu's population was only one, but the allele substitution was observed at five loci comparing with the other populations. Average heterozygosity ranged from 0.039 to 0.061 (0.051 on the average) in Japanese populations, 0.045-0.061 (0.054 on the average) in Lake Biwa, 0.027-0.039 (0.032 on the average) in Korean, and 0.011 in Ryukyu. Gpi-l100 and Mpi100 allele frequencies of Korean populations were slightly higher than those of Japanese populations. However, the level of genetic distance between them was very low (D=0.0012). On the other hand, the genetic distance between amphidromous and landlocked forms was relatively large (D=0.0197). The population of Ryukyu Islands was re-markably different from Japanese and Korean populations (D=0.2812).抄録全体を表示PDF形式でダウンロード (689K) -
萩原 篤志, 日野 明徳, 平野 礼次郎1988 年 54 巻 4 号 p. 569-575
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーThe effect of temperature (15-30°C) and chlorinity (4-16‰) on resting egg production of the rotifer Brachionus plicatilis was investigated. The rate of resting egg formation was found to increase at lower temperatures and chlorinities. The number of resting eggs produced by 10, 000 rotifers at 15°C and 4‰ Cl' was 8, 300, as opposed to 6.1 at 30°C and 16‰ Cl'. Further, the steps which precede egg formation, i.e., appearance of mictic females, fecundity of male-producing mictic females, mating and fecundity of resting egg-producing females, were activated at lower temperatures and chlorinities. The fecundity of each female type and the lifetime swimming distance (life span×swimming speed) of males increased at lower temperatures and chlorinities. These factors were used as an index of biological activity.
The data demonstrate a concurrence of optimum conditions for resting egg production with rotifer biological viability. This suggests that greater numbers of mictic females occur and more resting eggs are formed when the individual rotifers are physiologically vigorous.抄録全体を表示PDF形式でダウンロード (562K) -
萩原 篤志, 日野 明徳, 平野 礼次郎1988 年 54 巻 4 号 p. 577-580
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーResting egg formation was compared among five stocks of the marine rotifer Brachionus plicatilis. The three large type (L-type) and two small type (S-type) stocks were collected in Japan.
The number of resting eggs produced by 10, 000 rotifers at 25°C and 8‰ Cl', was: 3680 (L-type University of Tokyo stock), 2270 (S-type Mie Prefecture stock), 1480 (L-type Mie Prefecture stock), 1.7 (S-type Lake Hamana stock) and 0 (L-type Yashima stock). These results were supported by data on the appearance rate of mictic females and the fecundity of resting egg producing females.
Results of the current study suggest that the selection of rotifer stock is crucial to mass production of resting eggs.抄録全体を表示PDF形式でダウンロード (340K) -
川原 逸朗, 楠田 理一1988 年 54 巻 4 号 p. 581-584
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーLysozyme activities of the skin mucus, serum, and extracts of kidney, spleen, and liver in eel Anguilla japonica, ayu Plecoglossus altivelis, yellowtail Seriola quinqueradiata, and red sea bream Pagrus major were determined. Activity was measured by the turbidimetric method using acetone-ether dried cells of Micrococcus lysodeikticus as substrate.
The highest lysozyme activities in eel and yellowtail were observed in the kidney at 16.61 and 41.32μg/mg protein, respectively. In ayu and red sea bream, the highest lysozyme activities were exhibited by the skin mucus at 34.89 and 0.86μg/mg protein, respectively. Remarkably lower lysozyme activity was observed in red sea bream as compared to the other species.抄録全体を表示PDF形式でダウンロード (338K) -
大池 一臣, 足立 伸次, 長浜 嘉孝1988 年 54 巻 4 号 p. 585-591
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーChanges in estradiol-17β, testosterone and 17α, 20β-dihydroxy-4-pregnen-3-one (17α, 20β-diOHprog) levels were correlated with changes in gonadosomatic index and ovarian histology during the sexual maturation of female red seabream Pagrus major.
Between January and March, plasma estradiol-17β levels were very low (below 200pg/ml). A slight increase was observed in vitellogenic females (about 300pg/ml) collected in April. A dramatic increase in estradiol-17β levels occurred in females collected in May, which contained mature oocytes (i.e., the germinal vesicle had disappeared and the ooplasm was completely trans-lucent) as well as oocytes at various stages of vitellogenesis. Although plasma testosterone levels also increased in April and May, the magnitude of elevation was much smaller than that of estra-diol-17β. Testosterone levels were less than 100pg/ml throughout the remainder of the sampling periods. 17α, 20β-diOHprog was present in plasma throughout the sampling periods, but the levels (about 200pg/ml) were lower than those in salmonids. A slight but significant increase (about 400pg/ml) was found in prespawning females collected in April and spawning females in May. These results are discussed in relation to previous works on seasonal changes in plasma steroid levels of salmonids and other species which have ovaries of the total synchronous or group synchronous type.抄録全体を表示PDF形式でダウンロード (1553K) -
大池 一臣, 足立 伸次, 長浜 嘉孝1988 年 54 巻 4 号 p. 593-598
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーChanges of plasma testosterone, 11-ketotestosterone and 17, 20β-dihydroxy-4-pregnen-3-one (17α, 20β-diOHprog) levels were correlated with changes in gonadosomatic index (GSI) and testi-cular histology during the sexual maturation of male red seabream Pagrus major.
A sharp increase in the GSI occurred during April, with the increased formation of sperma-tozoa. High GSI values were maintained in May, followed by a sharp drop in June. The values were consistenily low during the remainder of the sampling periods. Plasma testosterone levels were maintained at low levels (below 200pg/ml) from January to March, rapidly increased to 500pg/ml in April and reached a peak of 870pg/ml in May. The levels showed a distinct drop in June, and remained low throughout the remainder of the sampling periods. The profiles and absolute levels of plasma 11-ketotestosterone were almost similar to those of testosterone. 17α, 20β-diOHprog could be detected in plasma throughout the sampling periods, but the levels (about 200pg/ml) were much lower than those of salmonids. There was a slight but significant increase in l7α, 20β-diOHprog levels (350pg/ml) in males collected during early spermiating period (April). However, the levels decreased even during the period of active spermiation (May).抄録全体を表示PDF形式でダウンロード (1611K) -
千葉 健治1988 年 54 巻 4 号 p. 599-606
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーExperiments were carried out to examine the effect of nearly constant dissolved oxygen con-centrations, both below and above the air saturation level, on the growth of young striped bass (body weight 2.9-15.0g).
Fish were reared for 8 days in 5 different tanks. Each of these tanks had a volume of 16 liters. These tanks were continuously supplied with sea water having different dissolved oxygen con-centrations. Oxygen concentrations were controlled by bubbling nitrogen or oxygen gas through the inflowing water. During the experiments water temperature fluctuated between 20.9 and 27.2°C and the chlorinity varied from 12.16 to 18.38%. Fish were fed three times a day with commercially available, crumbled pellet for young ayu-fish.
When the dissolved oxygen concentration was less than about 53% in air saturation, the growth rate and the food conversion efficiency increased remarkably with the increase of dissolved oxygen. The increase of feeding rate was found to be gradual upto 60% in air saturation. Nearly the same levels in the growth rate and food conversion efficiency were observed, when the dissolved oxygen concentrations ranged from 53 to 250% in air saturation. In the case of feeding rate nearly same level was observed, when the dissolved oxygen concentration ranged from 60 to 250% in air saturation. No clear effect of oxygen-supersaturation was observed.抄録全体を表示PDF形式でダウンロード (600K) -
渡邊 精一1988 年 54 巻 4 号 p. 607-611
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーA mathematical model is constructed with which stocking effects on a system that includes threshold densities for two competing species may be determined. The nullcline of the system changes its form with increase of stocking. The combination of the nullclines produces compli-cated phases. If stocking occurs for only one species, this species has a chance to eliminate the other depending on the initial conditions and stocking levels. The stocking is effective to control natural populations.抄録全体を表示PDF形式でダウンロード (296K) -
柳川 晋一, 渡邊 精一1988 年 54 巻 4 号 p. 613-618
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーThe life history and morphological characteristics of a hippolytid shrimp Hippolyte ventricosa were investigated during 1983 and 1984 in Kominato Bay, Chiba prefecture. The two or more generations in the year could be observed according to the distributions of carapace length and number of eggs carried.
Two rostrum types were observed; Sword type and Blade type. In the Sword type, the lower border of rostrum was straight from base to distal edge, while in the Blade type, it was expanded roundly. The number of lower border teeth of rostrum was significantly different between two types. 99% of the male was Sword type. In the female, the proportion of the Blade type reached only 78%. The ovigerous ratio of the Blade type was higher than that of the Sword type. These results indicate the sexual dimorphism of Hipplyte ventricosa.抄録全体を表示PDF形式でダウンロード (311K) -
上田 高嘉, 佐藤 良三, 小林 仁道1988 年 54 巻 4 号 p. 619-625
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーGynogenetic haploids were recognized in the abnormal embryos induced by an applica-tion of Pressure shock shortly after fertilization between eggs of masu salmon Oncorhynchus masou and sperms of kokanee O. nerka. In rainbow trout, the haploids were recognized in the abnormal embryos induced by only fertilization and by an application of thermal or pressure shocks shortly after fertilization. In the strain of rainbow trout used here, the XX/XY-sex chro-mosome system were observed. Because all haploids recognized in this study had X chromosomes, their genomes may consist of the maternal chromosomes. The reason why the haploids de-veloped was not clear in this study.抄録全体を表示PDF形式でダウンロード (1896K) -
谷内 透1988 年 54 巻 4 号 p. 627-633
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーI examined 356 specimens of the Japanese swellshark caught off Choshi, near Tokyo, Japan. The Japanese swellshark Cephaloscyllium umbratile attained maturity at a total length of 861-880mm size class for males and 921-940mm for females. All males over 960mm and females over 1040mm were mature. The largest male (1140mm) was only slightly smaller than the largest female (1145mm). In males, both clasper length and testes weight increased rapidly with the onset of maturity. Occurrence of ripe ova or egg cases in females and presence of semen in the seminal vesicle of males throughout the year, as well as the lack of seasonal changes in male gonad indices indicate that C. umbratile does not have a well-defined reproductive season. Food items of the shark consisted of at least 71 prey species, principally fishes. Pacific mackerel and Japanese sardine were the dominant prey. Ten species of Chondrichthyan fishes were also important in their diet.抄録全体を表示PDF形式でダウンロード (472K) -
須山 三千三, 平野 敏行, 鈴木 健1988 年 54 巻 4 号 p. 635-638
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーThe changes in content and molecular weight of gelatin in hot water extracts from snapping turtles during heating were investigated. The amounts of gelatin and total nitrogen increased rapidly and reached a maximal value after 24h of heating. The breakdown of gelatin molecules occurred during heating; the average molecular weights estimated by a gel filtration and an SDS-polyacrylamide gel elect-ophoresis were approximately 50, 000 and 35, 000 after 8h, 28, 000 after 12h, 8, 000 after 24h, and 4, 000 after 48h. It was suggested that the degradation products of gelatin play an important role on the taste of the soup.抄録全体を表示PDF形式でダウンロード (1003K) -
周 照仁, 落合 芳博, 渡部 終五, 橋本 周久1988 年 54 巻 4 号 p. 639-648
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーDiscoloration profiles of unfrozen or frozen and thawed (“frozen/thawed”) meat of bluefin, yellowfin, and bigeye tunas during iced storage were examined, taking as parameters the metmyo-globin (metMb) to total Mb ratio (metMb%), solubility (extractability) of Mb, and Hunter color difference scale (L, a, and b values).
During storage, metMb% rapidly increased, while Mb solubility and a value remarkably decreased, L and b values tending to increase. Discoloration of frozen/thawed meat generally proceeded faster than that of unfrozen meat during iced storage, irrespective of tuna species. No significant differences in discoloration profile were observed among surface, middle and inner portions of dorsal meat, and ventral meat. Bigeye tuna meat showed a quite slow discoloration, even after freezing and thawing.
In the bluefin tuna meat which was pre-stored at -20° ?? -80°C for one month, followed by iced storage, the lower the pre-storage temperature was, the slower the rate of discoloration.抄録全体を表示PDF形式でダウンロード (1954K) -
落合 芳博, 周 照仁, 渡部 終五, 橋本 周久1988 年 54 巻 4 号 p. 649-653
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーAttempts were made to evaluate the discoloration of unfrozen tuna meat, and frozen and thawed (“frozen/thawed”) tuna meat by Hunter tristimulus values (L, a, and b), as a substitute for the metmyoglobin (metMb) ratio (metMb%). Correlation coefficient between metMb% and a/b ratio was higher than that between metMb% and a value. The coefficient was around -0.7 for bluefin and -0.8 ?? -0.9 for yellowfin tuna meat, suggesting that a/b ratio can be used as a parameter to evaluate the discoloration of tuna meat.
L and b values were judged not to be useful parameters, since the former was remotely correlated with metMb%, and the latter showed only a small change.抄録全体を表示PDF形式でダウンロード (314K) -
絵面 良男, 川端 美樹, 宮下 富美江, 木村 喬久1988 年 54 巻 4 号 p. 655-663
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーConditions for the forced cultivation of makonbu in the nursery tanks which were examined in this study were as follows; Zoospores of makonbu were collected by cremona strings (culture bed), and were reared until grown up to visible size of sporophytes in aerated tanks containing enriched seawater (culture medium) for two months at 10-13°C and 12-16h light exposure per day. The culture medium was renewed every week after initial 12-13 days' incubation.
Changes of bacterial population in the culture medium and on the culture bed of the makonbu nursery tanks were examined for 40 days cultivation. Number of viable cells in the culture medium increased from 102 to 106cells/ml after 12 days. During this period, the predominant Alterornonas and Vibrio (the decomposers of macromolecular organic substrates) were replaced by terrestrial or marine pseudomonads which were non-decomposers of macromolecular organic substrates. In the following two weeks, the number of viable cells decreased to 104cells/ml, but the same groups of bacteria maintained their dominance. At the end of the experiment (40 days), viable cells increased again, and alginate and laminarin decomposers, such as the populations of marine pseudomonads, Flavobacterium and Alcaligenes increased.
On the culture bed, number of viable cells increased from 102 to 108cells/g after 20 days and maintained the same level throughout the following periods. Changes of bacterial flora on the culture bed resembled with these of culture medium, but occurred about one week later.抄録全体を表示PDF形式でダウンロード (681K) -
絵面 良男, 山本 啓之, 木村 喬久1988 年 54 巻 4 号 p. 665-672
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーAttempts were made for the isolation of organisms that caused red staining of culture bed (cremona strings) of sporophytes of makonbu and falling of sporophytes from the red-spotted culture bed. Nine strains of Alteromonas sp. were isolated from red-spotted culture beds in the three different nurseries, and were shown to produce prodigiosin-like pigment on double layer agar plates as well as cremona strings covered by soft agar layer, containing viable cells of Escherichia coli. The isolates failed to utilize cell-components of makonbu, such as mannitol, alginate, laminarin and cellulose, but were able to lyse the viable cells of other gram-negative bacteria.
According to these properties, it appeared that the isolates grow at the expense of other viable gram-negative bacteria on the cultured bed by lysing them, and produce prodigiosin-like pigment resulting in the staining of cultured bed.抄録全体を表示PDF形式でダウンロード (3324K) -
加納 哲, 脇坂 基司, 中山 照雄, 丹羽 栄二1988 年 54 巻 4 号 p. 673-676
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーGel forming ability of sardine whole body induced by protein denaturant was examined. The paste was obtained by homogenizing the whole body of sardine and treated with different denatur-ant, such as guanidine hydrochloride (Gu-HCl) and its thiocyanate (Gu-SCN), respectively, and then gelled by dialysis against different solution at 4°C for 96h.
When the paste was treated with Gu-HCl and dialyzed against distilled water, the resulting gel was strengthened with the increase in concentration to 8M (moles/kg sardine), with treating time of to 24h, and with temperature of 70°C. The proximate composition of this gel was moisture 87.5%, crude protein 8.9%, crude fat 1.5%, and crude ash 0.5%. From the paste, 97.6-99.2% Gu-HCl was removed by dialysis.抄録全体を表示PDF形式でダウンロード (1076K) -
橘 勝康, 土居 達也, 槌本 六良, 三嶋 敏雄, 小倉 理一, 松清 恵一, 保田 正人1988 年 54 巻 4 号 p. 677-681
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーThe effect of swimming exercise on retardation of softening of flesh was examined with cultured red sea-bream Pagrus major (2 years old) exercised for 0 (control) or 12h a day during 1, 2 or 4 weeks in water flow of 2.5 BL (body length)/s. Fish were instantly killed by exsanguination and stored in ice for 12 days. Pieces of ordinary muscle of the dorsal part and caudal part were sampled from the iced fish every 2 days up to the 12th day, and myofibrils were prepared from the muscle. The number of sarcomeres composing the myofibrils was counted under a microscope. The fre-quency in percentage of F1-4, myofibrils composed of 1 to 4 sarcomeres, was used as an index of softness of the flesh. The frequency of F1-4 increased during storage faster in the cultured fish than in the wild ones, and slower in exercised fish than in nonexercised ones among cultured fish, especially at the caudal muscle. These results suggest that the flesh texture of cultured red sea-bream may be improved by swimming exercise.抄録全体を表示PDF形式でダウンロード (386K) -
槌本 六良, 三嶋 敏雄, 宇津木 照洋, 北島 俊一, 矢田 殖朗, 千田 哲資, 保田 正人1988 年 54 巻 4 号 p. 683-689
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーBehavior of ATP related compounds in fish muscle during resolution was studied for a total of 66 fish species collected from the tropical, subtropical, and temperate waters. Percentage levels of ATP differed by fish species and by habitat temperatures. When the fish were kept at 32°C after killing, relative levels of ADP and AMP lowered simultaneously with, and proportionately to the lowering in the level of ATP.
Decreasing rates of aggregate percentage level of ATP, ADP, and AMP at 32°C, designated as Δ(ATP+ADP+AMP)32 (%/h), tended to be larger for fishes with lower habitat temperatures. Δ(ATP+ADP+AMP)32 was always larger than ΔK32. Accordingly, IMP level continued to rise until (ATP+ADP+AMP) level became zero when it reached its peak, then began to decrease. The rates of increase and decrease of IMP, and the temporal phase and level of its peak could be approximately estimated by Δ(ATP+ADP+AMP)32 and Δ32.
The present results also suggested the adaptation of fishes to the habitat temperature.抄録全体を表示PDF形式でダウンロード (540K) -
上野 隆二, 阪中 和紀, 池田 誠司, 堀口 吉重1988 年 54 巻 4 号 p. 691-697
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーA pepstatin insensitive protease was purified from mackerel white muscle by a combination of acid treatment, ammonium sulfate fraction, Q Sepharose Fast Flow ion exchange chromato-graphy, Cellulofine GC-200 gel filtration, hydrophobic chromatography on Phenyl-Superose column, chromatofocusing on Mono P column, re-chromatofocusing on the column, and ion ex-change chromatography on Mono Q column. The specific activity of the enzyme increased about 7, 750-fold in 1.6% yield, and the final preparation proved to be homogeneous on polyacryl-amide slab gel electrophoresis.抄録全体を表示PDF形式でダウンロード (1335K) -
上野 隆二, 池田 誠司, 阪中 和紀, 堀口 吉重1988 年 54 巻 4 号 p. 699-707
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーThe purified mackerel white muscle pepstatin insensitive protease was characterized. The enzyme had a pH optimum of 4.0 and a temperature optimum at 45°C when hemoglobin was used as substrate. The enzyme was strongly inactivated by leupeptin, PCMB, Hg2+ and Cue2+. The enzyme inactivated by PCMB and Hg2+ was activated again by addition of dithiothreitol, 2-mercaptoethanol and cysteine. Rabbit muscle aldolase was inactivated by the enzyme. The enzyme hydrolyzed Z-Phe-Arg-methylcoumarylamide much more than Bz-Phe-Val-Arg-methyl-coumarylamide. The molecular weight of the enzyme was estimated to be 48, 000 by gel filtration, and the isoelectric point was 4.2. It is suggested that the pepstatin insensitive protease belongs to a cysteine proteinase and shows some similarities to cathepsins L and S.抄録全体を表示PDF形式でダウンロード (605K) -
生田 國雄1988 年 54 巻 4 号 p. 709-715
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーThe study was carried out to demonstrate the relationship between metal concentrations in soft bodies at the pre-spawning stage and year-class structure determined by shell length. The specimens for the determination of metal concentrations were divided into groups at the interval of 2mm in shell length, and 26 analytical groups were formed. The concentrations of Fe, Zn, Cu, and Mn in soft bodies were determined by atomic absorption spectrophotometry.
In the sample population collected in May, 1984, the seven groups, by shell length, were equivalent to the seven normal distributions, respectively. They were converted into the respective year-classes on the basis of analyses for shell lengths and conch weights of the consecutive collec-tions during 1984 and 1985. The life-span of a venus clam was estimated to be more than nine years for the population.
Using a double logarithmic diagram, metal concentrations against dry soft body weights regressed to linear functions for Fe, Cu and Mn; no critical points are on the slopes. On the other hand, the two critical points for Zn appeared in the ranges of 32-24 and 54-56mm shell length. The former was equivalent to the range of μ-σ of the second year-class. The latter was situated in the range between μ-σ and μ of the fifth year-class. The regressive patterns for Fe, Cu and Mn in the venus clam differed greatly from those in the wedge clam, but the patterns for zinc in the former was partly similar to that in the latter by having critical points on the slopes.抄録全体を表示PDF形式でダウンロード (532K) -
中山 照雄, 加納 哲, 丹羽 栄二1988 年 54 巻 4 号 p. 717-724
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーThe texture of the material for imitation crab leg in foreign and domestic markets was psychorheologically investigated and approached from both sides of stress relaxation and creep measurements. The values of the relaxation modulus E(t) and the creep compliance J(t) were calculated from a system of plots between stress and strain with time t as a parameter. Then, continuous relaxation curves and continuous creep curves were drawn by the computer to give the best fit to the experimental points of E(t) and J(t). The connective equations between Maxwell model parameters of stress relaxation measurement and Voigt model parameters of creep measurement were derived from the differential equations. The Voigt rheological parameters were predicted from the stress relaxation data. Continuous creep curves were drawn using these predicted Voigt rheological parameters. For the most part, these curves fitted to the experimental points.
Agreement was observed between the sensory evaluation and the stress relaxation/creep measurement, while reasonable relation was not observed between the sensory evaluation and the plunger penetration test. The measurement of E(t) was also effective to evaluate the physical property of the materials for imitation crab leg in both foreign and domestic markets. And E(t) and J(t) corresponded to the sensory softness even if the instrumental value of jelly strength did not correspond to the sense intensity of jelly strength.抄録全体を表示PDF形式でダウンロード (1358K) -
田中 信彦, 大和田 紘一1988 年 54 巻 4 号 p. 725-727
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーDecomposition of agar, starch, alginate, casein and organic phosphate (phenolphthalein diphosphate) by eleven clones of marine epiphytic diatoms (Grammatophora marina, Licmophora abbreviata, Navicula spp. and Nitzschia spp.) was examined.
Seven clones belonging to genera Navicula and Nitzschia exhibited agar hydrolyzing activity. Five clones (G. marina, Navicula spp. and Nitzschia spp.) hydrolyzed casein. Two clones of Nitzschia decomposed organic phosphate. There was no clone showing starch and alginate decom-position.
The results obtained suggest that marine epiphytic diatoms can decompose various organic compounds and may use the products for their growth in natural habitat.抄録全体を表示PDF形式でダウンロード (254K) -
渡辺 勝子, 鴻巣 章二1988 年 54 巻 4 号 p. 729
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (100K) -
今林 博道, 岩谷 照義1988 年 54 巻 4 号 p. 731
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (91K) -
杉田 治男, 野口 玉雄, 古田 真理子, 原田 輝雄, 村田 修, 橋本 周久, 出口 吉昭1988 年 54 巻 4 号 p. 733
発行日: 1988/04/25
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (89K)
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