全文获取类型
收费全文 | 97563篇 |
免费 | 576篇 |
国内免费 | 1097篇 |
出版年
2024年 | 8篇 |
2023年 | 60篇 |
2022年 | 149篇 |
2021年 | 279篇 |
2020年 | 196篇 |
2019年 | 210篇 |
2018年 | 11954篇 |
2017年 | 10752篇 |
2016年 | 7620篇 |
2015年 | 895篇 |
2014年 | 610篇 |
2013年 | 642篇 |
2012年 | 4669篇 |
2011年 | 13149篇 |
2010年 | 12190篇 |
2009年 | 8416篇 |
2008年 | 9985篇 |
2007年 | 11523篇 |
2006年 | 422篇 |
2005年 | 634篇 |
2004年 | 1064篇 |
2003年 | 1109篇 |
2002年 | 875篇 |
2001年 | 337篇 |
2000年 | 233篇 |
1999年 | 92篇 |
1998年 | 49篇 |
1997年 | 61篇 |
1996年 | 44篇 |
1995年 | 42篇 |
1994年 | 45篇 |
1993年 | 53篇 |
1992年 | 50篇 |
1991年 | 70篇 |
1990年 | 24篇 |
1989年 | 23篇 |
1988年 | 29篇 |
1987年 | 23篇 |
1986年 | 7篇 |
1985年 | 10篇 |
1984年 | 10篇 |
1983年 | 18篇 |
1972年 | 246篇 |
1971年 | 274篇 |
1970年 | 5篇 |
1965年 | 14篇 |
1962年 | 24篇 |
1956年 | 5篇 |
1944年 | 12篇 |
1940年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
Natalia Buier 《Dialectical Anthropology》2018,42(3):257-275
This article presents an analysis of the relationship between historical memory and the emergence and reproduction of a specific model of unionism. I argue that in order to understand the militant particularism of the Spanish engine drivers, we need to look at the historical representations that it is embedded in. Recourse to a generational framework makes possible the sustained presentation of the union as a case of successful workers’ organizing, in spite of evidence to the contrary. The historical ethnographic analysis of SEMAF, the Spanish engine drivers’ union, contributes to the analysis of historical memory within the contemporary anthropology of class. The article contributes to theoretical debates in the anthropology of class by reclaiming Michel Trouillot’s conceptualization of the historical process. Two aspects of Trouillot’s work are singled out: his dynamic understanding of the process of historical production and the corollary formulation of the overlapping capacities in which people participate in it (as agents, actors, and subjects) and his emphasis on the importance of expanding scholarly views of the field of historical production. 相似文献
994.
Fish Gut Microbiome: Current Approaches and Future Perspectives 总被引:1,自引:0,他引:1
Chandni Talwar Shekhar Nagar Rup Lal Ram Krishan Negi 《Indian journal of microbiology》2018,58(4):397-414
In recent years, investigations of microbial flora associated with fish gut have deepened our knowledge of the complex interactions occurring between microbes and host fish. The gut microbiome not only reinforces the digestive and immune systems in fish but is itself shaped by several host-associated factors. Unfortunately, in the past, majority of studies have focused upon the structure of fish gut microbiome providing little knowledge of effects of these factors distinctively and the immense functional potential of the gut microbiome. In this review, we have highlighted the recently gained insights into the diversity and functions of the fish gut microbiome. We have also delved on the current approaches that are being employed to study the fish gut microbiome with an aim to collate all the knowledge gained and make accurate conclusions for their application based perspectives. The literature reviewed indicated that the future research should shift towards functional microbiomics to improve the maximum sustainable yield in aquaculture. 相似文献
995.
996.
Jolanta J. Adamczyk 《Ecological Research》2011,26(3):547-554
Macrofungal communities were investigated in four associations of xerothermic swards: Festucetum pallentis, Origano-Brachypodietum, Adonido-Brachypodietum pinnati and Diantho-Armerietum elongatae in a Jurassic area of the Częstochowa Upland (southern Poland). A total of 47 species were recorded. The self-organising
map (SOM)—an unsupervised algorithm for artificial neural networks—was used to recognise patterns in the macrofungal communities
of diverse xerothermic swards. Only two associations were mycologically similar: Origano-Brachypodietum and Adonido-Brachypodietum pinnati. Species with high and significant IndVal (the species indicator value) for each investigated phytocoenoses are presented.
The presence of macrofungal species and the participation of indicator species were connected with habitat factors of plant
associations, as documented by the IndVal application. In the least fertile phytocoenoses, macrofungal communities were poor
with few indicator species. The more fertile phytocoenoses had richer and more varied communities of macrofungi with higher
numbers of indicator species. The ordering methods applied in this study were very effective for analyzing the macrofungal
communities existing in plant associations. 相似文献
997.
The most accepted hypothesis of magnetoreception for social insects is the ferromagnetic hypothesis which assumes the presence of magnetic material as a sensor coupled to sensitive structures that transmit the geomagnetic field information to the nervous system. As magnetite is the most common magnetic material observed in living beings, it has been suggested as basic constituent of the magnetoreception system. Antennae and head have been pointed as possible magnetosensor organs in social insects as ants, bees and termites. Samples of three antenna joints: head-scape, scape-pedicel and pedicel-third segment joints were embedded in epoxi resin, ultrathin sectioned and analyzed by transmission electron microscopy. Selected area electron diffraction patterns and X-ray energy dispersive spectroscopy were obtained to identify the nanoparticle compound. Besides iron oxides, for the first time, nanoparticles containing titanium have been identified surrounded by tissue in the antennae of ants. Given their dimension and related magnetic characteristics, these nanoparticles are discussed as being part of the magnetosensor system. 相似文献
998.
Huiru Lu Jun Chen Hui Huang Mengxue Zhou Qing Zhu Shao Q. Yao Zhifang Chai Yi Hu 《Biometals》2017,30(4):599-607
Both monoamine oxidase B (MAO-B) and iron accumulation are associated with neurologic diseases including Parkinson’s disease. However, the association of iron with MAO-B activity was poorly understood. Here we took advantage of highly sensitive and specific fluorescence probes to examine the change in MAO-B activity in human dopaminergic neuroblastoma (SH-SY5Y) cells upon iron exposure. Both ferric and ferrous ions could significantly enhance the activity of MAO-B, instead of MAO-A, in SH-SY5Y cells. In addition, iron-induced increase in MAO-B probe fluorescence could be prevented by pargyline and other newly developed MAO-B inhibitors, suggesting that it was MAO-B activity-dependent. These findings may suggest MAO-B is an important sensor in iron-stressed neuronal cells. 相似文献
999.
Background
Although capable to evolve, viruses are generally considered non-living entities because they are acellular and devoid of metabolism. However, the recent publication of the genome sequence of the Mimivirus, a giant virus that parasitises amoebas, strengthened the idea that viruses should be included in the tree of life. In fact, the first phylogenetic analyses of a few Mimivirus genes that are also present in cellular lineages suggested that it could define an independent branch in the tree of life in addition to the three domains, Bacteria, Archaea and Eucarya. 相似文献1000.