全文获取类型
收费全文 | 968篇 |
免费 | 95篇 |
出版年
2021年 | 8篇 |
2019年 | 8篇 |
2018年 | 11篇 |
2017年 | 14篇 |
2016年 | 12篇 |
2015年 | 24篇 |
2014年 | 29篇 |
2013年 | 35篇 |
2012年 | 57篇 |
2011年 | 42篇 |
2010年 | 25篇 |
2009年 | 19篇 |
2008年 | 39篇 |
2007年 | 31篇 |
2006年 | 28篇 |
2005年 | 25篇 |
2004年 | 35篇 |
2003年 | 34篇 |
2002年 | 38篇 |
2001年 | 28篇 |
2000年 | 25篇 |
1999年 | 24篇 |
1998年 | 25篇 |
1997年 | 14篇 |
1996年 | 14篇 |
1995年 | 14篇 |
1994年 | 12篇 |
1993年 | 8篇 |
1992年 | 19篇 |
1991年 | 18篇 |
1990年 | 16篇 |
1989年 | 18篇 |
1988年 | 18篇 |
1987年 | 14篇 |
1986年 | 18篇 |
1985年 | 26篇 |
1984年 | 11篇 |
1983年 | 8篇 |
1982年 | 9篇 |
1981年 | 9篇 |
1980年 | 10篇 |
1979年 | 9篇 |
1977年 | 12篇 |
1975年 | 11篇 |
1973年 | 13篇 |
1972年 | 10篇 |
1971年 | 17篇 |
1970年 | 19篇 |
1967年 | 7篇 |
1966年 | 9篇 |
排序方式: 共有1063条查询结果,搜索用时 15 毫秒
991.
Tradisi lisan masyarakat semai. Juli Edo. Monograf Fakulti Sains Kemasyarakatan dan Kemanusiaan, 16. Bangi: Universiti Kebangsaan Malaysia. 1990. 136 pp.
Indigenous Minorities of Peninsular Malaysia: Selected Issues and Ethnographies. Razha Rashid. ed. Kuala Lumpur: Intersocietal and Scientific Sdn. Bhd. (INAS), 1995. 183 pp.
Pathway to Dependence: Commodity Relations and the Dissolution of Semai Society. Colin Nicholas. Monash Papers on Southeast Asia, 33. Clayton, Australia: Centre of Southeast Asian Studies, Monash University, 1994. 130 pp.
Regional Development in Rural Malaysia and the "Tribal Question." Zawawi Ibrahim. Hull, Canada: University of Hull Centre for South-East Asian Studies, 1995. 60 pp.
Kami bukan anti-pembangunan! (Bicara Orang Asli menuju wawasan 2020). Zawawi Ibrahim. ed. Bangi: Jabatan Antropologi dan Sociology, Universiti Kebangsaan Malaysia, 1996. 145 pp. 相似文献
Indigenous Minorities of Peninsular Malaysia: Selected Issues and Ethnographies. Razha Rashid. ed. Kuala Lumpur: Intersocietal and Scientific Sdn. Bhd. (INAS), 1995. 183 pp.
Pathway to Dependence: Commodity Relations and the Dissolution of Semai Society. Colin Nicholas. Monash Papers on Southeast Asia, 33. Clayton, Australia: Centre of Southeast Asian Studies, Monash University, 1994. 130 pp.
Regional Development in Rural Malaysia and the "Tribal Question." Zawawi Ibrahim. Hull, Canada: University of Hull Centre for South-East Asian Studies, 1995. 60 pp.
Kami bukan anti-pembangunan! (Bicara Orang Asli menuju wawasan 2020). Zawawi Ibrahim. ed. Bangi: Jabatan Antropologi dan Sociology, Universiti Kebangsaan Malaysia, 1996. 145 pp. 相似文献
992.
993.
Comparative analysis of genetic diversity in pea assessed by RFLP- and PCR-based methods 总被引:10,自引:0,他引:10
J. Lu M. R. Knox M. J. Ambrose J. K. M. Brown T. H. N. Ellis 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1996,93(7):1103-1111
DNA-based molecular-marker techniques have been proven powerful in genetic diversity estimations. Among them, RFLP was the first and is still the most commonly used in the estimation of genetic diversity of eukaryotic species. The recently developed PCR-based multiple-loci marker techniques, which include RAPD, AFLP, Microsatellite-AFLP and inter-SSR PCR, are playing increasingly important roles in this type of research. Despite the wide application of these techniques, no direct comparison of these methods in the estimation of genetic diversity has been carried out. Here we report a direct comparison of DNA-based RFLP with various PCR-based techniques regarding their informativeness and applicability for genetic diversity analysis. Among ten pea genotypes studied, all the PCR-based methods were much more informative than cDNA-RFLP. Genetic diversity trees were derived from each marker technique, and compared using Mantel's test. By this criterion, all trees derived from the various molecular marker techniques, except for the tree derived from inter-SSR PCR, were significantly correlated, suggesting that these PCR-based techniques could replace RFLP in the estimation of genetic diversity. On the basis of this result, AFLP analysis was applied to assess the genetic diversity of a sample of accessions representing the various species and subspecies within the genus Pisum. 相似文献
994.
995.
996.
997.
998.
999.
Taxonomic recommendations for European birds 总被引:6,自引:0,他引:6
1000.
Edward M. Kohi Willem F. de Boer Martijn Slot Sipke E. van Wieren Jelle G. Ferwerda Rina C. Grant Ignas M. A. Heitkönig Henjo J. de Knegt Nicky Knox Frank van Langevelde Mike Peel Rob Slotow Cornelis van der Waal Herbert H. T. Prins 《African Journal of Ecology》2010,48(1):190-196
Browsing intensity influences a plant's response to herbivory. Plants face a trade-off between investment in the production of secondary compounds and investment in growth. To elucidate this trade-off, we simulated four browsing intensities (0%, 50%, 75% and 100%) on mopane saplings, Colophospermum mopane (J.Kirk ex Benth.) J.Léonard, in a greenhouse experiment. This showed that, with increasing defoliation intensity, plants change their investment strategy. At intermediate levels of defoliation (50%), mopane saplings increased the synthesis of condensed tannins, so that tannin concentrations followed a hump-shaped relation with defoliation intensity, with significantly higher tannin concentration at intermediate defoliation levels. When defoliated heavily (75% and 100%), tannin concentrations dropped, and plants were carbon stressed as indicated by a reduced growth rate of the stem diameter, and leaf production and mean individual leaf mass were reduced. This suggests that, at intermediate defoliation intensity, the strategy of the plants is towards induced chemical defences. With increasing defoliation, the relative costs of the secondary metabolite synthesis become too high, and therefore, the plants change their growing strategy. Hence, browsers should be able to benefit from earlier browsing by either adopting a low or a relatively high browsing pressure. 相似文献