全文获取类型
收费全文 | 200篇 |
免费 | 13篇 |
专业分类
213篇 |
出版年
2013年 | 3篇 |
2011年 | 4篇 |
2010年 | 3篇 |
2008年 | 4篇 |
2007年 | 4篇 |
2006年 | 4篇 |
2005年 | 2篇 |
2000年 | 2篇 |
1999年 | 3篇 |
1998年 | 8篇 |
1997年 | 8篇 |
1995年 | 6篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 3篇 |
1990年 | 2篇 |
1989年 | 4篇 |
1988年 | 3篇 |
1987年 | 5篇 |
1986年 | 4篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 3篇 |
1982年 | 5篇 |
1981年 | 3篇 |
1980年 | 4篇 |
1979年 | 2篇 |
1978年 | 6篇 |
1977年 | 3篇 |
1976年 | 2篇 |
1971年 | 4篇 |
1969年 | 5篇 |
1968年 | 3篇 |
1959年 | 10篇 |
1958年 | 6篇 |
1957年 | 6篇 |
1956年 | 5篇 |
1955年 | 11篇 |
1954年 | 2篇 |
1953年 | 4篇 |
1952年 | 6篇 |
1951年 | 8篇 |
1950年 | 6篇 |
1949年 | 7篇 |
1948年 | 5篇 |
1941年 | 1篇 |
1937年 | 1篇 |
1925年 | 1篇 |
1915年 | 1篇 |
排序方式: 共有213条查询结果,搜索用时 15 毫秒
1.
2.
The incidence of virus diseases in the honey bee 总被引:3,自引:0,他引:3
L. BAILEY 《The Annals of applied biology》1967,60(1):43-48
Chronic bee-paralysis virus and sacbrood virus occur commonly in apparently normal honey-bee colonies in Britain. Most sick adult bees not affected by Nosema apis, Malpighamoeba mellificae or Acarapis woodi have chronic paralysis and most dead larvae not affected by micro-organisms have sacbrood. Both virus diseases are probably limited by hereditary factors, but unknown environmental factors also seem to influence disease. Paralysed bees from Australia, Canada, Eire, Germany and Mexico were found to be infected with chronic paralysis virus. 相似文献
3.
CHRISTINE A. SUNDERMANN DAVID S. LINDSAY ROBERT E. TIBBS MARK A. BAILEY 《The Journal of eukaryotic microbiology》1988,35(4):465-469
The development of Caryospora bigenetica in vitro is described by light microscopy. Sporozoites from snake-derived oocysts were purified and inoculated onto cultures of primary testicle cells of the cotton rat, cotton rat kidney cells, and human fetal lung cells. Intracellular sporozoites were observed one and two days postinoculation (DPI). Motile, extracellular first-generation merozoites were present 3 DPI, and second-generation merozoites were present 5 DPI. Mature gamonts were observed 9 DPI and developed into unsporulated oocysts by 10 DPI. Oocysts sporulated in vitro, and excystation was observed. Cells that were penetrated by in vitro-produced sporozoites formed caryocysts by 16 DPI. To test infectivity of in vitro-derived stages, merozoites were removed from cultured cells 5 DPI and inoculated intraperitoneally into a mouse; infection resulted. Sporulated oocysts removed from cell cultures 12 DPI produced facial swelling in an orally inoculated cotton rat. 相似文献
4.
J. A. BAILEY 《The Annals of applied biology》1969,64(2):315-324
A sterile culture nitrate of Penicillium expansum was shown to induce pisatin synthesis in pea leaf discs. The amount of pisatin produced by pea leaves was shown to decrease as they underwent senescence. N6-benzyladenine delayed senescence, and at the same time maintained the production of pisatin at a high level. In darkness, leaf discs maintained on either benzyl-adenine solution or distilled water produced greater amounts of pisatin than leaf discs which were not treated in this way. Benzyladenine also increased pisatin production by leaf discs kept in the light. The relevance of these results to disease resistance and possible mechanisms involved are discussed. 相似文献
5.
P. C. E. BAILEY 《Austral ecology》1989,14(4):381-386
Functional response curves were constructed for adult Ranatra dispar feeding on four different densities of notonectid prey at 15, 20, 25 and 30°C. Values for the attack-rate and handling time were estimated from Roger's random predator equation. The most generally applicable response was the type II, with the mean number of prey eaten increasing with increase in temperature. The attack-rate was linearly related to temperature while handling time decreased exponentially with increase in temperature, although values changed very little between 20 and 30°C. It is suggested that changes in metabolic activity and related ‘hunger’ effects on various components of predatory behaviour account for the observed number of prey eaten up to 25°C, however, an increase in the level of prey activity at 30°C may influence the observed number of prey caught (and eaten) at this higher temperature. 相似文献
6.
7.
8.
M. J. BAILEY A. K. LILLEY I. P. THOMPSON P. B. RAINEY† R. J. ELLIS 《Molecular ecology》1995,4(6):755-764
A plasmid-free, non-pathogenic, ribosomal RNA group 1 fluorescent pseudomonad, Pseudomonas fluorescens SBW25, was selected from the microflora of sugar beet (Beta vulgaris) and modified to contain constitutively expressed marker genes. By site directed homologous recombination a KX cassette [kanamycin resistance (kanτ) and catechol 2,3 dioxygenase (xylE)] and a ZY cassette [lactose utilization (lacZY, β-galactosidase, lactose permease)] were introduced at least 1 Mbp apart on the 6.6 Mbp bacterial chromosome. Separate sites were selected to provide sensitive detection methods and allow assessments of marker gene stability of the genetically modified micro-organism (GMM), SBW25EeZY6KX, when it colonized the leaves and roots of sugar beet plants following seed inoculation. 相似文献
9.
Efficiency of Selenite Cystine and TT Enrichment Broths for the Detection of Salmonella 总被引:1,自引:1,他引:0
Comparisons of selenite cystine (SC) and TT enrichment broths for detecting salmonellas were made with pure culture suspensions, with samples of naturally or artificially contaminated foods and with poultry feed. Selenite cystine recovered higher numbers of salmonellas from pure cultures and ground beef, while TT broth recovered higher numbers from pork sausage and poultry feed. Differences in the recovery of salmonellas from other food products appeared to be insignificant. The use of both SC and TT is thus recommended for maximal recovery of these organisms. 相似文献