巻号一覧
45 巻, 1 号
選択された号の論文の7件中1～7を表示しています
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NOBUO MUNAKATA1970 年 45 巻 1 号 p. 1-9
発行日: 1970年
公開日: 2007/05/21
ジャーナル フリーUV damage induced in the DNA of uvr or uvs strains of Bacillus subtilis was repaired in uvr recipient cells, but no such repair occurred in uvs cells. Post-irradiation repair of UV damage induced in the DNA of the uvr strain was inferred from the increase in extractable transforming activity observed during post-irradiation incubation carried out before assaying with uvs recipient strains. No post-irradiation restoration of UV-irradiated transforming DNA was observed in uvs cells. Strain uvs-80 was able to excise thymine dimers from the DNA as did the uvr strain but lost extractable transforming activity rapidly during post-irradiation incubation.抄録全体を表示PDF形式でダウンロード (759K) -
YOSHIOMI TAKAGI1970 年 45 巻 1 号 p. 11-21
発行日: 1970年
公開日: 2007/05/21
ジャーナル フリーThe factor determining the length of immature stage in P. multimicronucleatum and P. caudatum was investigated allowing lines of a clone to grow at different fisson rates induced by temperature or by the amount of food. The onset of maturity was determined by the first detection of mating reactivity. In many clones of both species, the length of immature stage was closely related to the number of fissions rather than the physical time; all lines grown at different fission rates became mature after about the same number of fissions. But in some other clones of both species, it was related to both the number of fissions and the physical time; lines at lower fission rates became mature in more days but in less fissions than lines at higher fission rates. This difference among clones did not correlate to mating-type difference.
The transition from immaturity to full maturity did not occur abruptly. Instead, the percentage of mating reactive cells increased steadily with age in some clones and they increased with fluctuation in others.抄録全体を表示PDF形式でダウンロード (998K) -
YOSHIHISA FUJIO, YASUHIRO KANOH, KYOJI KONDO1970 年 45 巻 1 号 p. 23-33
発行日: 1970年
公開日: 2007/05/21
ジャーナル フリーAppearance and hemagglutination activity of the blood group antigens belonging to four systems in chick embryos and chicks were investigated, using seven inbred strains which were homozygous for the genes determining antigens.
An antigen of the A system was fully expressed at the early embryonic stage. Its agglutinability was relatively high during embryonic development and decreased gradually after hatching. During the third week after hatching, its activity was maintained at the same level as that of adult chickens.
Several antigens of the B and D systems appeared at 7-12th day of incubation. Around this time, the replacement of immature red cells by mature red cells took place. It suggests that these antigens may be not present on immature red cells but present on mature red cells.
An antigen of the R system appeared slowly in the fourth week after hatching. A considerable variation in the time of appearance of the activity among individuals was observed in R antigen of the R system and both M and K antigens of the B system.抄録全体を表示PDF形式でダウンロード (947K) -
VI. DIALLEL ANALYSIS OF RADIOSENSITIVITY WITH RESPECT TO REDUCTION IN ROOT LENGTHYASUO UKAI1970 年 45 巻 1 号 p. 35-44
発行日: 1970年
公開日: 2007/05/21
ジャーナル フリーThe results of diallel analysis of radiosensitivity in six rice varieties were presented. The criterion of radiosensitivity used was reduction in root length following an exposure of the seeds to gamma-rays. It was found that: (1) The temperature under which the seeds ripened had a strong influence not only on mean radiosensitivity but also on the genetical behavior of radiosensitivity in the subsequent generation. (2) After a 20°C treatment, radiosensitivity was determined by a genetic system of additive effect and incomplete dominance. No evidence for nonallelic interaction was obtained. (3) After a 30°C treatment, however, a non-allelic interaction was observed, which was due to two particular partental lines; their removal recovered additivity between loci of the remaining parents. (4) After the 20°C treatment, dominance was in the direction of both increasing and decreasing sensitivity, while dominance after 30°C treatment was in the direction of increasing. (5) The proportion of dominant alleles to all parental alleles also differed according to the temperature treatment. (6) No correlation was found between the radiosensitivity shown by log 100K and the root length of the control.抄録全体を表示PDF形式でダウンロード (826K) -
II. STATISTICAL ANALYSES ON THE POLYMORPHIC POPULATIONS OF GOATS IN SOUTHWESTERN ISLANDS OF JAPANKEN NOZAWA1970 年 45 巻 1 号 p. 45-57
発行日: 1970年
公開日: 2007/05/21
ジャーナル フリーStatistical analyses on the polymorphisms in the 42 subpopulations of the hybrid goats raised in southwestern islands of Japan were conducted. The polymorphic traits used here were colored or white coat, horned or polled, having or not wattles and supernumerary teats. The purely native goats had already been known to be nearly monomorphic as being colored, horned, wattleless and possessing supernumerary teats, and the Saanen breed introduced there nearly monomorphic as being white and lacking supernumerary teats and polymorphic in having or not both horns and wattles.
Geographical cline which was parallel with the grade of urbanization of the locality was observed in the frequency of genes for colored and in the frequency of appearance of supernumerary teats, both of these traits being monomorphic in the immigrants. Degree of genetic differentiation among subpopulations was calculated to be remarkably larger than that obtained in the human subpopulations by Nei and Imaizumi (1966 a and b). These two phenomena would be ascribed, at least partially, to such a peculiarity that the immigration of breeding males is very much influential upon the gene constitution of farm animal populations.
The correlation analyses revealed that the completely random combination of genes as not attained and some positive correlation was observed to be remained both within and between subpopulations. Repeated introduction of Saanen breed into each subpopulation and shortage of time to randomize gene combination were considered as the causes of the observed correlations.
Effect of selection was also observed in the subpopulations: the polled gene had selective disadvantage and the character of supernumerary teats had selective advantage in comparison with the white coat color gene. The former was explained by the close linkage between the polled gene and the gene for intersexuality.抄録全体を表示PDF形式でダウンロード (1251K) -
HIROSHI KAYANO, HIROSHI WATANABE1970 年 45 巻 1 号 p. 59-69
発行日: 1970年
公開日: 2007/05/21
ジャーナル フリー1. By the patterns of H-segments in chromosome A, B, C, D, and E, 8, 4, 3, 2, and 5 types were distinguished, respectively, in 50 plants from Kombumori population, and 11, 3, 2, 2, and 2 types respectively in 50 plants from Okuyukiusu population. Remarkable differences were found between the two populations with respect to the frequencies of different chromosome types of A, B, and E.
2. The number of different karyotypes among 50 plants was 49 in Kombumori and 42 in Okuyukiusu. No prevalence of certain definite karyotypes was found.
3. In both populations and in all five chromosomes, A-E, the observed frequencies of homozygous pairs were in good conformity with the calculated frequencies based on random breeding, revealing no differential viabilities among the different karyotypes.抄録全体を表示PDF形式でダウンロード (2393K) -
SOME HISTOLOGIC AND CYTOLOGIC FEATURES OF LEUKEMIAS INDUCED BY DIBUTYLNITROSAMINE IN CBA/H-T6T6 MICEMAKITO EMURA1970 年 45 巻 1 号 p. 71-78
発行日: 1970年
公開日: 2007/05/21
ジャーナル フリーRepetitive intravenous injections of a small dose of dibutylnitrosamine frequently induced acute leukemias of reticulumcell type in low-leukemic mice with an average latent period of 152 days and with an average effective dose of 244μg. Two cases of leukemias were transplantable in syngeneic hosts.
Electron microscopic study revealed no virus-like particles in the leukemic cells.
The modal number of chromosomes of transplanted leukemic cells shifted from 40 in earlier passages to 41 in later. Through those passages about 50 per cent of cells with 40 chromosomes and about 90 per cent of cells with 41 chromosomes had one chromosome characterized by a secondary constriction.
Discussion was made on some factors responsible for leukemogenesis by dibutylnitrosamine.抄録全体を表示PDF形式でダウンロード (1888K)
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