全文获取类型
收费全文 | 841篇 |
免费 | 110篇 |
出版年
2020年 | 10篇 |
2019年 | 11篇 |
2018年 | 8篇 |
2017年 | 16篇 |
2016年 | 9篇 |
2015年 | 25篇 |
2014年 | 21篇 |
2013年 | 25篇 |
2012年 | 22篇 |
2011年 | 24篇 |
2010年 | 23篇 |
2009年 | 18篇 |
2008年 | 25篇 |
2007年 | 31篇 |
2006年 | 26篇 |
2005年 | 31篇 |
2004年 | 23篇 |
2003年 | 19篇 |
2002年 | 19篇 |
2001年 | 20篇 |
2000年 | 18篇 |
1999年 | 23篇 |
1998年 | 10篇 |
1996年 | 10篇 |
1995年 | 10篇 |
1992年 | 12篇 |
1991年 | 23篇 |
1990年 | 10篇 |
1988年 | 14篇 |
1987年 | 12篇 |
1986年 | 16篇 |
1985年 | 11篇 |
1984年 | 23篇 |
1983年 | 12篇 |
1982年 | 15篇 |
1980年 | 9篇 |
1979年 | 21篇 |
1977年 | 9篇 |
1976年 | 17篇 |
1975年 | 16篇 |
1974年 | 17篇 |
1973年 | 15篇 |
1972年 | 14篇 |
1971年 | 17篇 |
1970年 | 19篇 |
1969年 | 13篇 |
1968年 | 14篇 |
1967年 | 12篇 |
1966年 | 12篇 |
1965年 | 9篇 |
排序方式: 共有951条查询结果,搜索用时 15 毫秒
861.
862.
863.
A double layer of protein in mitochondrial cristae 总被引:2,自引:0,他引:2
864.
Sara E. Cannon Simon D. Donner Angela Liu Pedro C. González Espinosa Andrew H. Baird Julia K. Baum Andrew G. Bauman Maria Beger Cassandra E. Benkwitt Matthew J. Birt Yannick Chancerelle Joshua E. Cinner Nicole L. Crane Vianney Denis Martial Depczynski Nur Fadli Douglas Fenner Christopher J. Fulton Yimnang Golbuu Nicholas A. J. Graham James Guest Hugo B. Harrison Jean-Paul A. Hobbs Andrew S. Hoey Thomas H. Holmes Peter Houk Fraser A. Januchowski-Hartley Jamaluddin Jompa Chao-Yang Kuo Gino Valentino Limmon Yuting V. Lin Timothy R. McClanahan Dominic Muenzel Michelle J. Paddack Serge Planes Morgan S. Pratchett Ben Radford James Davis Reimer Zoe T. Richards Claire L. Ross John Rulmal Jr. Brigitte Sommer Gareth J. Williams Shaun K. Wilson 《Global Change Biology》2023,29(12):3318-3330
Scientists and managers rely on indicator taxa such as coral and macroalgal cover to evaluate the effects of human disturbance on coral reefs, often assuming a universally positive relationship between local human disturbance and macroalgae. Despite evidence that macroalgae respond to local stressors in diverse ways, there have been few efforts to evaluate relationships between specific macroalgae taxa and local human-driven disturbance. Using genus-level monitoring data from 1205 sites in the Indian and Pacific Oceans, we assess whether macroalgae percent cover correlates with local human disturbance while accounting for factors that could obscure or confound relationships. Assessing macroalgae at genus level revealed that no genera were positively correlated with all human disturbance metrics. Instead, we found relationships between the division or genera of algae and specific human disturbances that were not detectable when pooling taxa into a single functional category, which is common to many analyses. The convention to use percent cover of macroalgae as an indication of local human disturbance therefore likely obscures signatures of local anthropogenic threats to reefs. Our limited understanding of relationships between human disturbance, macroalgae taxa, and their responses to human disturbances impedes the ability to diagnose and respond appropriately to these threats. 相似文献
865.
The dielectrophoretic force on single yeast cells in water has been measured by the method of balancing it against the force
of gravity. The force expression for the electrode geometry of parallel wires is derived and related to the electrical properties
of the cell and its surroundings through the parameter K, the excess relative permittivity. A detailed analysis is given of
the two alternate experimental approaches that can be taken using the balance technique. Experimental values of K are determined
for various conditions and compared with those predicted from a theoretical model of a yeast cell. 相似文献
866.
867.
868.
DNA synthesis of intracellular Trypanosoma cruzi amastigotes, following the infection of bovine embryo skeletal muscle (BESM) cells, was studied by autoradiography. After penetration, there was a prereplicative lag period (similar to or approximately 12 h) followed by a synchronous round of DNA synthesis which was found to be independent of parasite number/BESM cell cand the host cell DNA synthesis cycle. Parasite reproduction occurred, for the first time, at approximately 21 h postinfection. It was concluded that T. cruzi trypomastigotes are in the G1/G0 phase of their cell division cycle and that after penetration parasite reproduction occurs independent of events controlling host cell DNA synthesis and growth. The early synchronous growth of intracellular amastigotes should facilitate further studies on the biochemical events controlling trypomastigote-to-amastigote transformation and amastigote reproduction. A further application is envisaged for studies on the mode of action of drugs with trypanocidal activity. 相似文献
869.
870.