全文获取类型
收费全文 | 95篇 |
免费 | 1篇 |
国内免费 | 8篇 |
出版年
2022年 | 1篇 |
2021年 | 1篇 |
2014年 | 3篇 |
2013年 | 14篇 |
2012年 | 3篇 |
2011年 | 1篇 |
2010年 | 3篇 |
2009年 | 4篇 |
2008年 | 1篇 |
2007年 | 5篇 |
2006年 | 3篇 |
2005年 | 1篇 |
2004年 | 1篇 |
2003年 | 1篇 |
2002年 | 2篇 |
2001年 | 5篇 |
2000年 | 2篇 |
1998年 | 2篇 |
1997年 | 8篇 |
1996年 | 1篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1990年 | 2篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 3篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1978年 | 4篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 5篇 |
1974年 | 5篇 |
1973年 | 2篇 |
1972年 | 3篇 |
1971年 | 3篇 |
排序方式: 共有104条查询结果,搜索用时 0 毫秒
101.
P T Shukla 《Mutation research》1972,16(4):363-371
The previously reported difference between the mutational spectra of hydrazine (HZ) and hydroxylamine (HA) was confirmed for one selected locus (miniature) at which hydrazine produces no mutations in treated late larval spermatogonia or premeiotic spermatocytes sampled by 3 days' progeny. The genetically effective dose was measured in most experiments by the production of v mutants, and in a few by the production of sex-linked lethals. In a total of over 37 000 X-chromosomes (16 000 from previous, and over 21 000 from present experiments) treatment with HZ yielded no m mutation, but 90 v mutations. After treatment with genetically equivalent doses of HA, m and v mutations were about equally frequent. The ratio of visible mutations at the v locus to lethals on the X-chromosomes was exceptionally high after either treatment. So was the ratio of m mutations to lethals after treatment with HA. 相似文献
102.
Michael R. Dadd Timothy D.W. Claridge Alan J. Pettman Christopher J. Knowles 《Biotechnology letters》2001,23(3):221-225
Whole cells of the bacterium Rhodococcus rhodochrous LL100-21, which had been grown on benzonitrile to induce the nitrilase enzyme, converted benzonitrile to benzohydroxamic acid in the presence of hydroxylamine. 相似文献
103.
Synergistic effect of an Escherichia coli mutator gene on mutagenesis by ultraviolet radiation and by alkylating agents 总被引:3,自引:0,他引:3
R F Hill 《Mutation research》1972,14(1):27-31
E. coli strains differing in a gene responsible for high spontaneous mutability (mut HI) were compared for their mutability by UV radiation and by the alkylating agents ethyl methanesulfonate and methyl methanesulfonate. All three exogenous mutagenic agents induced significantly higher frequencies of mutants with impaired carbohydrate-fermenting ability when the mutator allele rather than the wild-type allele was present. Thus the mut HI gene product possibly increases the probability of replication error due to alterations in the structure of the template strand of DNA. An attempt to detect an synergistic effect for UV-induced suppressor mutations was unsuccessful. The failure may have been due to the particular method used for scoring this type of mutation. 相似文献
104.