全文获取类型
收费全文 | 43853篇 |
免费 | 4481篇 |
国内免费 | 13篇 |
出版年
2023年 | 188篇 |
2022年 | 387篇 |
2021年 | 747篇 |
2020年 | 537篇 |
2019年 | 633篇 |
2018年 | 792篇 |
2017年 | 708篇 |
2016年 | 1163篇 |
2015年 | 1912篇 |
2014年 | 2057篇 |
2013年 | 2644篇 |
2012年 | 3180篇 |
2011年 | 3084篇 |
2010年 | 2050篇 |
2009年 | 1781篇 |
2008年 | 2496篇 |
2007年 | 2501篇 |
2006年 | 2372篇 |
2005年 | 2121篇 |
2004年 | 2065篇 |
2003年 | 1866篇 |
2002年 | 1843篇 |
2001年 | 693篇 |
2000年 | 637篇 |
1999年 | 664篇 |
1998年 | 481篇 |
1997年 | 374篇 |
1996年 | 372篇 |
1995年 | 374篇 |
1994年 | 337篇 |
1993年 | 327篇 |
1992年 | 437篇 |
1991年 | 366篇 |
1990年 | 368篇 |
1989年 | 379篇 |
1988年 | 377篇 |
1987年 | 341篇 |
1986年 | 281篇 |
1985年 | 304篇 |
1984年 | 313篇 |
1983年 | 273篇 |
1982年 | 265篇 |
1981年 | 240篇 |
1980年 | 211篇 |
1979年 | 221篇 |
1978年 | 188篇 |
1977年 | 192篇 |
1976年 | 188篇 |
1975年 | 202篇 |
1973年 | 168篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Xu Zhang Wei Zhang Santosh L. Saraf Mehdi Nouraie Jin Han Michel Gowhari Johara Hassan Galina Miasnikova Adelina Sergueeva Sergei Nekhai Rick Kittles Roberto F. Machado Joe G. N. Garcia Mark T. Gladwin Martin H. Steinberg Paola Sebastiani Donald A. McClain Victor R. Gordeuk 《Human genetics》2015,134(8):895-904
102.
Samuel M. Imathiu Rumiana V. Ray Matthew I. Back Martin C. Hare Simon G. Edwards 《Journal of Phytopathology》2013,161(7-8):553-561
Fusarium langsethiae is a toxigenic fungal species that has been reported in European small‐grain cereal crops such as oats, wheat and barley. Although its relative contribution to fusarium head blight (FHB) symptoms is not well understood, it is reported to contaminate these cereals with high levels of HT‐2 and T‐2 trichothecenes mycotoxins that are currently under consideration for legislation by the European Commission. Ten commercial oat fields in Shropshire and Staffordshire (two adjacent counties in the Midlands) in the UK were surveyed in the 2006/2007 growing season. Samples were taken from predetermined field locations at Zadoks growth stages 32/33, 69, 77‐85 and 90‐92 for F. langsethiae biomass and HT‐2 and T‐2 toxins quantification. The results from this study showed that oats can be heavily infected with F. langsethiae and have high concentrations of HT‐2 and T‐2 toxins with no apparent FHB symptoms. The regression of HT‐2 + T‐2 toxins on F. langsethiae DNA concentration was highly significant (P < 0.001, r2 = 0.55). The results indicated that although F. langsethiae had no direct effect on crop yield, it may result in indirect economic losses where the grain can be rejected or downgraded as a result of intolerable levels of HT‐2 and T‐2 toxins, which are of human food and animal feed safety concern. The influence of cultural field practices on the infection and HT‐2 and T‐2 toxins accumulation in oats was not clear and warrants further studies to identify the sources of F. langsethiae inoculum and conditions favourable for infection and mycotoxin production. 相似文献
103.
104.
Crosses between monokaryotic isolates of two strains of Lentodium squamulosum and one strain of Panus tigrinus showed complete intercompatibility. Hybrid fruits from crosses between monokaryotic isolates of L. squamulosum and P. tigrinus were uniformly like the P. tigrinus parent. Though both isolates of L. squamulosum showed considerable variability in form, merging toward P. tigrinus, L. squamulosum could always be distinguished from P. tigrinus from hand sections of the hymenophore. The significance of these results as they bear on the problem of inter-relationships between hymenomycetes and gasteromycetes is discussed. L. squamulosum is recognized as variety squamulosus of P. tigrinus. 相似文献
105.
106.
107.
108.
109.
110.