全文获取类型
收费全文 | 502篇 |
免费 | 19篇 |
出版年
2023年 | 2篇 |
2022年 | 3篇 |
2021年 | 10篇 |
2020年 | 12篇 |
2019年 | 5篇 |
2018年 | 9篇 |
2017年 | 10篇 |
2016年 | 16篇 |
2015年 | 30篇 |
2014年 | 45篇 |
2013年 | 34篇 |
2012年 | 37篇 |
2011年 | 29篇 |
2010年 | 21篇 |
2009年 | 20篇 |
2008年 | 23篇 |
2007年 | 35篇 |
2006年 | 32篇 |
2005年 | 23篇 |
2004年 | 21篇 |
2003年 | 21篇 |
2002年 | 22篇 |
2001年 | 6篇 |
2000年 | 7篇 |
1999年 | 4篇 |
1998年 | 1篇 |
1996年 | 3篇 |
1995年 | 3篇 |
1992年 | 3篇 |
1991年 | 3篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1983年 | 2篇 |
1981年 | 2篇 |
1980年 | 3篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 3篇 |
1975年 | 2篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1971年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有521条查询结果,搜索用时 218 毫秒
31.
The physicochemical properties of cellular environments with a high macromolecular content have been systematically characterized to explain differences observed in the diffusion coefficients, kinetics parameters, and thermodynamic properties of proteins inside and outside of cells. However, much less attention has been given to the effects of macromolecular crowding on cell physiology. Here, we review recent findings that shed some light on the role of crowding in various cellular processes, such as reduction of biochemical activities, structural reorganization of the cytoplasm, cytoplasm fluidity, and cellular dormancy. We conclude by presenting some unresolved problems that require the attention of biophysicists, biochemists, and cell physiologists. Although it is still underappreciated, macromolecular crowding plays a critical role in life as we know it. 相似文献
32.
Eduardo Vilanova Cristiano Coutinho Guilherme Maia Paulo A. S. Mourão 《Cell and tissue research》2010,340(3):523-531
Marine sponges (Porifera) display an ancestral type of cell-cell adhesion, based on carbohydrate-carbohydrate interaction.
The aim of the present work was to investigate further details of this adhesion by using, as a model, the in vitro aggregation
of dissociated sponge cells. Our results showed the participation of sulfated polysaccharides in this cell-cell interaction,
as based on the following observations: (1) a variety of sponge cells contained similar sulfated polysaccharides as surface-associated
molecules and as intracellular inclusions; (2) 35S-sulfate metabolic labeling of dissociated sponge cells revealed that the majority (two thirds) of the total sulfated polysaccharide
occurred as a cell-surface-associated molecule; (3) the aggregation process of dissociated sponge cells demanded the active
de novo synthesis of sulfated polysaccharides, which ceased as cell aggregation reached a plateau; (4) the typical well-organized
aggregates of sponge cells, known as primmorphs, contained three cell types showing sulfated polysaccharides on their cell
surface; (5) collagen fibrils were also produced by the primmorphs in order to fill the extracellular spaces of their inner
portion and the external layer surrounding their entire surface. Our data have thus clarified the relevance of sulfated polysaccharides
in this system of in vitro sponge cell aggregation. The molecular basis of this system has practical relevance, since the
culture of sponge cells is necessary for the production of molecules with biotechnological applications. 相似文献
33.
Luciane A. Faine Danielle M.H. Cavalcanti Martina Rudnicki Simone Ferderbar Sandra M.D. Macedo Heraldo P. Souza Sandra H.P. Farsky Lisardo Boscá Dulcineia Saes Parra Abdalla 《The Journal of nutritional biochemistry》2010,21(2):125-132
The vascular effects of nitrolinoleate (LNO2), an endogenous product of linoleic acid (LA) nitration by nitric oxide-derived species and a potential nitrosating agent, were investigated on rat endothelial-leukocyte interactions. Confocal microscopy analysis demonstrated that LNO2 was capable to deliver free radical nitric oxide (·NO) into cells, 5 min after its administration to cultured cells, with a peak of liberation at 30 min. THP-1 monocytes incubated with LNO2 for 5 min presented nitrosation of CD40, leading to its inactivation. Other anti-inflammatory actions of LNO2 were observed in vivo by intravital microscopy assays. LNO2 decreased the number of adhered leukocytes in postcapillary venules of the mesentery network. In addition to this, LNO2 reduced mRNA and protein expression of β2-integrin in circulating leukocytes, as well as VCAM-1 in endothelial cells isolated from postcapillary venules, confirming its antiadhesive effects on both cell types. Moreover, 2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide, a nitric oxide scavenger, partially abolished the inhibitory action of LNO2 on leukocyte-endothelium interaction, suggesting that the antiadhesion effects of LNO2 involve a dual role in leukocyte adhesion, acting as a nitric oxide donor as well as through nitric oxide-independent mechanisms. In conclusion, LNO2 inhibited adhesion molecules expression and promoted ·NO inactivation of the CD40–CD40L system, both important processes of the inflammatory response. 相似文献
34.
35.
36.
Costa DL Dias-Melicio LA Acorci MJ Bordon AP Tavian EG Peraçoli MT Soares AM 《Microbiology and immunology》2007,51(1):73-80
Paracoccidioidomycosis, a deep mycosis endemic in Latin America, is a chronic granulomatous disease caused by the fungus Paracoccidioides brasiliensis. Phagocytic cells play a critical role against this fungus, and several studies have shown the effects of activator and suppressive cytokines on macrophage and monocyte functions. However, studies on polymorphonuclear neutrophils (PMNs), that are the first cells recruited to the infection sites, are scarcer. Thus, the objective of this paper was to assess whether interleukin-10 (IL-10), a potent anti-inflammatory cytokine, is able to block the activity of IFN-gamma-activated human PMNs upon P. brasiliensis intracellular killing, in vitro. The results showed that IFN-gamma-activated PMNs have an effective fungicidal activity against the fungus. This activity was associated with the release of high levels of H(2)O(2), the metabolite involved in phagocytic cells antifungal activities. However, the concomitant incubation of these cells with IFN-gamma and IL-10 significantly blocked IFN-gamma activation. As a consequence, PMNs killing activity and H(2)O(2) release were inhibited. Together, our results show the importance of PMNs exposure to activator or suppressor cytokines in the early stages of paracoccidioidomycosis infection. 相似文献
37.
Cardoso T. F. Bruscadin J. J. Afonso J. Petrini J. Andrade B. G. N. de Oliveira P. S. N. Malheiros J. M. Rocha M. I. P. Zerlotini A. Ferraz J. B. S. Mourão G. B. Coutinho L. L. Regitano L. C. A. 《Mammalian genome》2022,33(4):619-628
Mammalian Genome - Cis-acting effects of noncoding variants on gene expression and regulatory molecules constitute a significant factor for phenotypic variation in complex traits. To provide new... 相似文献
38.
Polyana C Tizioto Jeremy F Taylor Jared E Decker Caio F Gromboni Mauricio A Mudadu Robert D Schnabel Luiz L Coutinho Gerson B Mour?o Priscila SN Oliveira Marcela M Souza James M Reecy Renata T Nassu Flavia A Bressani Patricia Tholon Tad S Sonstegard Mauricio M Alencar Rymer R Tullio Ana RA Nogueira Luciana CA Regitano 《遗传、选种与进化》2015,47(1)
39.
Infestation of arboreal nests of coatis by triatomine species,vectors of Trypanosoma cruzi,in a large Neotropical wetland
下载免费PDF全文
![点击此处可从《Journal of vector ecology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Juliane Saab de Lima Fabiana Lopes Rocha Fernanda Moreira Alves Elias Seixas Lorosa Ana Maria Jansen Guilherme de Miranda Mourão 《Journal of vector ecology》2015,40(2):379-385
The coati (Nasua nasua, Carnivora) is a medium‐sized mammal common in the Pantanal of Brazil. Unlike most mammals, coatis construct arboreal nests used for resting and reproduction. In this region, the coati is an important host of Trypanosoma cruzi, the causative agent of Chagas disease. There are two possible routes through coatis can be infected by T. cruzi: the oral route or the vectorial route. However, the relative importance of each of these routes in the infection of coatis and its role in the sylvatic cycle of the parasite are unknown. Our objectives were to investigate: (i) whether coati nests were infested by triatomine bugs, (ii) what species were frequent in the nests, (iii) whether the triatomines in nests were infected by T. cruzi, and (iv) what were the food resources of these triatomines. Eight of the 24 nests sampled were infested with triatomines, a total of 37 specimens of at least two species (Rhodnius stali and Triatoma sordida). In one nest, R. stali and T. sordida co‐occurred and both fed on multiple resources, including coatis. This is the first report of triatomines occurring in arboreal nests of coatis. The co‐occurrence of two different genera of triatomine vectors and coatis within the limited space of the coati nests provide multiple opportunities for the exchange of the protozoan parasite through both the vectorial and oral transmission routes. 相似文献