巻号一覧
65 巻, 3 号
選択された号の論文の6件中1～6を表示しています
- |<
- <
- 1
- >
- >|
REGULAR PAPERS
-
Etsuko T. MATSUURA, Sadao I. CHIGUSA, Yuzo NIKI1990 年 65 巻 3 号 p. 87-93
発行日: 1990年
公開日: 2006/06/10
ジャーナル フリーThe transmission of foreign mitochondrial DNA (mtDNA) was investigated in heteroplasmic lines of Drosophila melanogaster constructed by germ-plasm transplantation and maintained at 19°C. When D. melanogaster was used as a germ-plasm donor, donor mtDNA was retained in all four heteroplasmic lines examined. Individual females were found to be heteroplasmic at the 17th and 18th generations. Donor mtDNA derived from D. mauritiana was found to have decreased in all four heteroplasmic lines examined. It could no longer be found after the 16th generation. This difference in the modes of transmission of donor mtDNA in intra- and interspecific combinations of heteroplasmy indicates that there may be certain species-specific functions which propagate and transmit endogenous mtDNA under the nuclear genome of D. melanogaster.
抄録全体を表示PDF形式でダウンロード (814K) -
Yuichiro HIRAIZUMI1990 年 65 巻 3 号 p. 95-108
発行日: 1990年
公開日: 2006/06/10
ジャーナル フリーHiraizumi et al. (1973b) concluded that maternal-fetal ABO incompatibility effect upon the frequency of prenatal deaths was totally absent in two modern Japanese cities, Ohdate and Akita. However, they found a significant heterogeneity in the frequency of prenatal deaths among 16 mating types and suggested that the viability of A-bearing fetuses was higher than that of others, hence the frequency of prenatal deaths decreased with the increasing probability of producing A-bearing fetuses.
Further analyses were performed in the present study and the above suggestion was confirmed. Then, the average numbers of prenatal deaths and pregnancies per couple were analyzed separately for their relationships with the probability of producing an A-bearing fetus. The results were found to be consistent with the model that the average numbers of prenatal losses per couple are approximately the same between two groups of matings, one producing and the other not producing A-bearing fetuses, but such losses occur more frequently for the A-bearing fetuses than others at the very early stage of pregnancy such that wives may not recognize such losses. Although the stages of losses are different between A-bearing and other fetuses, the net losses are nearly the same between them, so that such losses will not be reflected in the segregation frequencies among children, as shown by Hiraizumi et al. (1973a).
抄録全体を表示PDF形式でダウンロード (2009K)
SHORT PAPERS
-
Masami HASEGAWA, Naoyuko IWABE, Yasuo MUKOHATA, Takashi MIYATA1990 年 65 巻 3 号 p. 109-114
発行日: 1990年
公開日: 2006/06/10
ジャーナル フリーFrom a comparison of elongation factors Tu(EF-Tu) and G(EF-G) from a variety of species covering all the three urkingdoms (eubacteria, archaebacteria, and eukaryotes), including two archaebacterial species, Methanococcus vanielli, a methanogen, and Halobacterium halobium, an extremely holophilic archaebacterium, a rooted phylogenetic tree was inferred by the neighbor joining method and the maximum likelihood method, and the phylogenetic relationship among the three urkingdoms was determined. Furthermore the branching patterns of the three urkingdoms were examined in detail by the bootstrap resampling analysis. It was shown that both the extremely halophilic archaebacterium and the methanogen are more closely related to eukaryotes than they are to eubacteria with significant reliability. Thus the eocyte tree proposed by Lake et al. is highly unlikely: According to the eoeyte tree, the two archaebacterial groups should be closely related to eubacteria and distantly related to eukaryotes.
抄録全体を表示PDF形式でダウンロード (726K) -
Erden-Dalai Wu, Hachiro INOKUCHI, Haruo OZEKI1990 年 65 巻 3 号 p. 115-119
発行日: 1990年
公開日: 2006/06/10
ジャーナル フリーBy DNA sequencing and gene dissection, it has been revealed that Su+UGA#11, the mutant prfB of E. coli (Chang et al, 1990) has a double mutation compared with the wild-type LS653: one is a base substitution from T to C at the codon 63 and the other is from G to A at the codon 79. Both mutations cause amino acid substitution, Leu63 → Phe63 (L63F) and Asp79 → Gly79 (D79G), and are necessary to confer the efficient UGA suppressor activity.
抄録全体を表示PDF形式でダウンロード (544K)
REVIEWS
-
西田 育巧1990 年 65 巻 3 号 p. 121-134
発行日: 1990年
公開日: 2006/06/10
ジャーナル フリーPDF形式でダウンロード (3136K) -
T. R. ENDO1990 年 65 巻 3 号 p. 135-152
発行日: 1990年
公開日: 2006/06/10
ジャーナル フリーCertain alien chromosomes have been found to be preferentially transmitted in wheat. They are derived from differnt species of Aegilops, a genus related to wheat (Triticum). Such chromosomes ensure their own selective retention in wheat by causing sterility in gametes not carrying them, hence they are termed gametocidal chromosomes. There are at least three types of the gametocidal chromosomes that have different mode of gametocidal action and homoeology. The gametocidal chromosomes in the same homoeologous group (group 2, 3, or 4) have the same gametocidal action. Some of the gametocidal chromosomes induce chromosome mutations in either gametophytes or zygotes of common wheat with specific genotypes. The chromosome mutations preferentially occur in gametophytes without the gametocidal chromosome or in the zygotes when the gametocidal chromosome is delivered by the pollen. Chromosome mapping using induced deletions is under way.
抄録全体を表示PDF形式でダウンロード (3122K)
- |<
- <
- 1
- >
- >|