全文获取类型
收费全文 | 3786篇 |
免费 | 301篇 |
出版年
2024年 | 2篇 |
2023年 | 32篇 |
2022年 | 66篇 |
2021年 | 158篇 |
2020年 | 82篇 |
2019年 | 100篇 |
2018年 | 122篇 |
2017年 | 101篇 |
2016年 | 141篇 |
2015年 | 249篇 |
2014年 | 265篇 |
2013年 | 283篇 |
2012年 | 453篇 |
2011年 | 363篇 |
2010年 | 213篇 |
2009年 | 184篇 |
2008年 | 252篇 |
2007年 | 234篇 |
2006年 | 169篇 |
2005年 | 155篇 |
2004年 | 113篇 |
2003年 | 111篇 |
2002年 | 93篇 |
2001年 | 26篇 |
2000年 | 14篇 |
1999年 | 22篇 |
1998年 | 16篇 |
1997年 | 7篇 |
1996年 | 6篇 |
1995年 | 4篇 |
1994年 | 3篇 |
1993年 | 7篇 |
1992年 | 6篇 |
1991年 | 3篇 |
1990年 | 4篇 |
1988年 | 5篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1983年 | 2篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1976年 | 3篇 |
1971年 | 1篇 |
1964年 | 1篇 |
1961年 | 1篇 |
1960年 | 1篇 |
1955年 | 1篇 |
1934年 | 1篇 |
1933年 | 2篇 |
1932年 | 1篇 |
排序方式: 共有4087条查询结果,搜索用时 31 毫秒
31.
Engelhardt Ilonka C. Niklaus Pascal A. Bizouard Florian Breuil Marie-Christine Rouard Nadine Deau Florence Philippot Laurent Barnard Romain L. 《Plant and Soil》2021,461(1-2):151-162
Plant and Soil - Contrasting nutrient-acquisition strategies would explain why species differ in their distribution in relation to soil phosphorus (P) availability, promoting diversity. However,... 相似文献
32.
Trébouet Florian Malaivijitnond Suchinda Reichard Ulrich H. 《Primates; journal of primatology》2021,62(3):491-505
Primates - Macaque reproductive patterns range from strictly seasonal breeding to non-seasonal breeding, but factors explaining this variation are not fully understood. Valid reproductive... 相似文献
33.
34.
35.
Birthe Tegtmeyer Gabrielle Vieyres Daniel Todt Chris Lauber Corinne Ginkel Michael Engelmann Maike Herrmann Christian K. Pfaller Florian W. R. Vondran Ruth Broering Ehsan Vafadarnejad Antoine-Emmanuel Saliba Christina Puff Wolfgang Baumgrtner Csaba Miskey Zoltn Ivics Eike Steinmann Thomas Pietschmann Richard J. P. Brown 《Journal of virology》2021,95(10)
36.
37.
38.
39.
Elgar Susanne Quabius Silke Tribius Alessa Heinrichs Dirk Haaser Andr Kühnel Martin Laudien Florian Hoppe Robert Mlynski Petra Ambrosch Markus Hoffmann 《Translational oncology》2021,14(2)
Previous studies describe a correlation between HPV-positivity and non-smoking in TSCC; p16INK4A-expression as surrogate-marker for HPV-DNA/RNA-positivity is discussed controversially. In the present study, these parameters are assessed prospectively. HPV-status of sputum and tonsillar-swabs was analyzed to determine their validity as surrogate-marker for tissue-HPV-status.TSCC- (n = 52) and non-neoplastic tonsillar tissue (n = 163) were analyzed. HPV-DNA- and HPV-RNA-status of total sputum, cellular fraction and supernatants, tonsillar-swabs and -tissue was determined by (RT)-PCR. Immunohistochemistry determined p16INK4A-expression.23/163 (14.2%) non-neoplastic tonsils were HPV-DNA-positive; five patients (3 HPV16, 2 HPV11) had active HPV-infections (HPV-RNA-positive), in all biomaterials. 140/163 (85.9%) patients were either HPV-DNA-positive or HPV-DNA-negative in all samples. 21/52 (40.4%) TSCC-tonsils were HPV-DNA-positive; 17 patients were HPV-RNA-positive (14 HPV16; 4 HPV18). 40/52 (76.9%) TSCC-patients were congruent in all biomaterials. p16INK4A-expression alone would have misclassified the HPV-status of 14/52 (26.2%) TSCC-patients.This prospective study confirms the discrepancy between HPV-status and p16INK4A-expression and the significant correlation between non-smoking and HPV-DNA-positivity. HPV-sputum- and/or swab-results do not consistently match tissue-results, possibly having (detrimental) consequences if those were used to assess tissue-HPV-status. In the 5 patients with active HPV infection in the non-neoplasitic tonsils, tonsillectomy likely prevented subsequent development of TSCC. 相似文献
40.