全文获取类型
收费全文 | 73篇 |
免费 | 1篇 |
专业分类
74篇 |
出版年
2012年 | 2篇 |
2011年 | 3篇 |
2010年 | 1篇 |
2009年 | 4篇 |
2008年 | 1篇 |
2006年 | 2篇 |
2005年 | 3篇 |
2004年 | 2篇 |
2002年 | 1篇 |
2001年 | 1篇 |
2000年 | 2篇 |
1997年 | 3篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1986年 | 4篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 4篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1978年 | 1篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1958年 | 1篇 |
1957年 | 3篇 |
1956年 | 1篇 |
1955年 | 2篇 |
1954年 | 3篇 |
1953年 | 3篇 |
1952年 | 4篇 |
1951年 | 1篇 |
1948年 | 3篇 |
1946年 | 1篇 |
排序方式: 共有74条查询结果,搜索用时 15 毫秒
71.
H. E. PATERSON 《Systematic Entomology》1975,43(2):247-259
An account is given of samples of houseflies taken from various natural populations in Sri Lanka (Ceylon) to investigate the number of evolutionary forms of housefly that may occur on the island. The results are related to the formal taxonomy of the genus Musca. 相似文献
72.
73.
A new selective medium containing pentachloronitrobenzene and 2-aminobutane (the PAB medium) was developed for soil-dilution plate enumeration of fungal propagules of Fusarium solani var. coeruleum and F. sulphureum from field soil. Growth of ‘weed-fungi’ was less on the PAB medium than on the previously developed F. solani var. coeruleum isolation medium (the PM70 medium) and significantly more propagules of F. solani var. coeruleum were detected. Propagule counts (x) of F. solani var. coeruleum and F. sulphureum from the PAB medium, after log10 (x/10 + 1) transformation, were linearly related to the angular transformation of measurements of soil infectivity from the tuber bait method using the susceptible cv. Catriona. Slopes from disease-inoculum regressions for F. solani var. coeruleum and F. sulphureum in November and May were similar and this suggests that the mode of pathogenic action of F. solani var. coeruleum and F. sulphureum was similar. Recently harvested tubers, inoculated in November, however, were more resistant to infection by both pathogens than stored tubers inoculated in May. Storage of air dry soil at 4°C for 6 months reduced the population of F. sulphureum but not the population of F. solani var. coeruleum. Whereas the PAB medium is recommended primarily for use in the isolation of F. solani var. coeruleum and F. sulphureum from field soil, the PM70 medium appears to be more suitable for recovery of these pathogens and others, including Phoma exigua var. foveata from diseased tuber tissue. 相似文献
74.
Circuits and efficiency in incomplete block designs 总被引:1,自引:0,他引:1