全文获取类型
收费全文 | 189篇 |
免费 | 34篇 |
国内免费 | 1篇 |
出版年
2023年 | 5篇 |
2022年 | 3篇 |
2021年 | 12篇 |
2020年 | 3篇 |
2019年 | 7篇 |
2018年 | 6篇 |
2017年 | 9篇 |
2016年 | 8篇 |
2015年 | 11篇 |
2014年 | 6篇 |
2013年 | 13篇 |
2012年 | 17篇 |
2011年 | 11篇 |
2010年 | 9篇 |
2009年 | 5篇 |
2008年 | 6篇 |
2007年 | 11篇 |
2006年 | 6篇 |
2005年 | 5篇 |
2004年 | 8篇 |
2003年 | 8篇 |
2002年 | 7篇 |
2001年 | 7篇 |
2000年 | 2篇 |
1999年 | 5篇 |
1998年 | 4篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 5篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1981年 | 1篇 |
1977年 | 1篇 |
1974年 | 3篇 |
1973年 | 1篇 |
1972年 | 2篇 |
1970年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有224条查询结果,搜索用时 31 毫秒
1.
2.
Individually identified primary motoneurons of the zebrafish embryo pioneer cell-specific peripheral motor nerves. Later, the growth cones of secondary motoneurons extend along pathways pioneered by primary motor axons. To learn whether primary motor axons are required for pathway navigation by secondary motoneurons, we ablated primary motoneurons and examined subsequent pathfinding by the growth cones of secondary motoneurons. We found that ablation of the primary motoneuron that pioneers the ventral nerve delayed ventral nerve formation, but a normal-appearing nerve eventually formed. Therefore, the secondary motoneurons that extend axons in the ventral nerve were able to pioneer that pathway in the absence of the pathway-specific primary motoneuron. In contrast, in the absence of the primary motoneuron that normally pioneers the dorsal nerve, secondary motoneurons did not pioneer a nerve in the normal location, instead they formed dorsal nerves in an atypical position. This difference in the ability of these two groups of motoneurons to pioneer their normal pathways suggests that the guidance rules followed by their growth cones may be very different. Furthermore, the observation that the atypical dorsal nerves formed in a consistent incorrect location suggests that the growth cones of the secondary motoneurons that extend dorsally make hierarchical pathway choices. 相似文献
3.
4.
5.
Insect resistance of transgenic plants that express modified Bacillus thuringiensis cryIA(b) and cryIC genes: a resistance management strategy 总被引:7,自引:0,他引:7
6.
Linden Ellie Rittenhouse Chadwick D. Peel Michael J. S. Ortega Isaac M. Smit Izak P. J. 《Ecosystems》2023,26(4):768-783
Ecosystems - In the early 1990’s, reserves adjacent to Kruger National Park (KNP) removed their fences to create a continuous landscape within the Kruger to Canyons Biosphere Reserve.... 相似文献
7.
Francesco Ricci Kshitij Tandon Maria Moßhammer Ellie H.-J. Cho Linda L. Blackall Michael Kühl Heroen Verbruggen 《Environmental microbiology》2023,25(8):1505-1521
The coral skeleton harbours a diverse community of bacteria and microeukaryotes exposed to light, O2 and pH gradients, but how such physicochemical gradients affect the coral skeleton microbiome remains unclear. In this study, we employed chemical imaging of O2 and pH, hyperspectral reflectance imaging and spatially resolved taxonomic and inferred functional microbiome characterization to explore links between the skeleton microenvironment and microbiome in the reef-building corals Porites lutea and Paragoniastrea benhami. The physicochemical environment was more stable in the deep skeleton, and the diversity and evenness of the bacterial community increased with skeletal depth, suggesting that the microbiome was stratified along the physicochemical gradients. The bulk of the coral skeleton was in a low O2 habitat, whereas pH varied from pH 6–9 with depth. Physicochemical gradients of O2 and pH of the coral skeleton explained the β-diversity of the bacterial communities, and skeletal layers that showed O2 peaks had a higher relative abundance of endolithic algae, reflecting a link between the abiotic environment and the microbiome composition. Our study links the physicochemical, microbial and functional landscapes of the coral skeleton and provides new insights into the involvement of skeletal microbes in the coral holobiont metabolism. 相似文献
8.
A high level of binding of [3H]methyltrienolone (R1881 = 17beta-hydroxy-17alpha-methyl-estra-4, 9, 11-trien-3-one) was found in cytosol prepared from adrenals of castrated male rats. Binding of [3H]R1881 was of high affinity (DK = 6.2 nM) and highly specific for androgens. The [3H]R1881 complex migrates at 7-9S on sucrose gradients in low ionic strength buffer and at 4-5S in buffer containing 0.4M KC1. All binding studies have been performed in parallel with rat ventral prostate and adrenal cytosol. The present data suggest the presence of an androgen binding component in rat adrenal tissue. 相似文献
9.
Maren de Vries Adil S. Mohamed Rachel A. Prescott Ana M. Valero-Jimenez Ludovic Desvignes Rebecca OConnor Claire Steppan Joseph C. Devlin Ellie Ivanova Alberto Herrera Austin Schinlever Paige Loose Kelly Ruggles Sergei B. Koralov Annaliesa S. Anderson Joseph Binder Meike Dittmann 《Journal of virology》2021,95(10)
10.
Ellie Vasta 《Ethnic and racial studies》2013,36(5):713-740
Abstract Recently in numerous European countries of immigration, there has been a widespread ‘moral panic’ about immigrants and ethnic diversity. In The Netherlands, a backlash has occurred in policy and in public discourse, with migrants being blamed for not meeting their responsibility to integrate and for practising ‘backward religions’. Why is it that a self-defined ‘liberal’ and ‘tolerant’ society demands conformity, compulsion and introduces seemingly undemocratic sanctions towards immigrants in a move towards assimilationism? These issues are analysed by providing an overview of modes of incorporation of immigrants in the Netherlands and it presents evidence on the socio-economic situation of immigrants. The article argues that patterns of disadvantage cannot be explained solely by the low human capital attributes of the original immigrants. In spite of multiculturalism, the causes have to be sought in pervasive institutional discrimination and the persistence of a culture of racism. The study argues that a shift to assimilation is more likely to create further societal divisions. 相似文献