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排序方式: 共有243条查询结果,搜索用时 453 毫秒
61.
Katiane Silva Concei??o Werner Ulrich Carlos Alberto Ribeiro Diniz Francisco Aparecido Rodrigues Marinho Gomes de Andrade 《PloS one》2014,9(8)
This paper proposes a statistical generalized species-area model (GSAM) to represent various patterns of species-area relationship (SAR), which is one of the fundamental patterns in ecology. The approach enables the generalization of many preliminary models, as power-curve model, which is commonly used to mathematically describe the SAR. The GSAM is applied to simulated data set of species diversity in areas of different sizes and a real-world data of insects of Hymenoptera order has been modeled. We show that the GSAM enables the identification of the best statistical model and estimates the number of species according to the area. 相似文献
62.
Miranda LS Marinho BG Leitão SG Matheus ME Fernandes PD Vasconcellos ML 《Bioorganic & medicinal chemistry letters》2004,14(6):1573-1575
We described in this paper the first synthesis to the (+/-) cis (6-ethyl-tetrahydropyran-2-yl) formic acid (1) using the very efficient Prins cyclization reaction as strategy to construction of its tetrahydropyran skeleton. This new compound presented a significant antinociceptive property by the tail-flick model. 相似文献
63.
64.
Effects of chronic exposure to coal in wild rodents (Ctenomys torquatus) evaluated by multiple methods and tissues 总被引:2,自引:0,他引:2
da Silva J de Freitas TR Heuser V Marinho JR Bittencourt F Cerski CT Kliemann LM Erdtmann B 《Mutation research》2000,470(1):39-51
Rio Grande do Sul (RS) coal is low quality and typically obtained by strip mining. In a recent study concerning 2 years of biomonitoring in coal regions, we demonstrated the genotoxicity of coal and related products on blood cells of native rodents, from RS, Brazil. With the goal of studying the variations in the effects of RS coal on different tissues of the same rodent, we utilized, besides the single cell gel (SCG) and micronucleus (MN) assay on blood, histological analyses and SCG assay of bone marrow, spleen, kidney, liver and lung cells, and MN assay of bone marrow and spleen cells. In addition, to identify agents that can potentially influence the results, concentrations of several heavy metals were analyzed in livers and in soil, and the total concentration of hydrocarbons in the soil was determined. Rodents exposed to coal were captured at two different sites, Butiá and Candiota, in RS. Reference animals were obtained from Pelotas, where there is no coal mining. This report provides chemical and biological data from coal regions, indicating the possible association between Zn, Ni, Pb and hydrocarbons in the induction of DNA damage (e.g. single strand-breaks and alkali-labile sites) determined by the alkaline SCG assay in cells from Ctenomys torquatus. The results of the present SCG study indicate that coal and by-products not only induce DNA damage in blood cells, but also in other tissue cells, mainly liver, kidney and lung. Neither the MN assay nor histopathological observations showed significant differences; these analyses may be useful under circumstances where genotoxicity is higher. In conclusion we believe that the in vivo genotoxicity of coal can be biomonitored by the SCG assay, and our studies suggest that wild rodents, such as C. torquatus are useful for monitoring genotoxic damage by both methods, the SCG assay and the MN test. 相似文献
65.
Bastos KR Marinho CR Barboza R Russo M Alvarez JM D'Império Lima MR 《Microbes and infection / Institut Pasteur》2004,6(6):630-636
The present review illustrates the current knowledge on the autocrine effect of IL-12, and the putative contribution of IL-23, on macrophages and dendritic cells, focusing on cell activation and microbicidal activity. Here, we present convincing evidence that IL-12 is not only a connective element between accessory cells and lymphocytes, but it is also a key molecule for programming the macrophage and dendritic cell functions. 相似文献
66.
R. C. Marinho C. Mendes‐Rodrigues A. M. Bonetti P. E. Oliveira 《Plant biology (Stuttgart, Germany)》2021,23(1):91-99
- Geographic parthenogenesis, range expansion of apomictic plants after climate changes, has been described for Northern Hemisphere gametophytic apomicts. But similar trends have been observed for sporophytic apomicts of Cerrado, the savannas in Brazil. Eriotheca pubescens is a common Cerrado tree, an agamic complex of either hexaploid/polyembryonic apomicts or tetraploid/monoembryonic sexual individuals. Some populations have been described as a new species, Eriotheca estevesiae, all included in the Eriotheca Stellate Trichome Species Complex (ESTSC). Since breeding systems and ploidy are clearly associated with polyembryony and stomatal size, we used these ancillary features to map the reproductive and ploidy level traits of E. pubescens and E. estevesiae.
- Leaves and seeds were collected from individuals of 19 populations. Seeds were evaluated for the presence of polyembryony and leaves for stomatal measurements.
- Eight populations were monoembryonic while another eight were polyembryonic and for other three, the embryonic pattern was not readily verified. E. pubescens polyembryonic and hexaploid populations formed a homogeneous group, but monoembryonic plants were more variable. E. estevesiae populations were monoembryonic with smaller stomata. In contrast, some E. pubescens monoembryonic populations further south presented larger stomata. Despite these outliers, possibly mixed populations, stomatal size and embryonic pattern differed from northern to southern populations.
- Embryonic pattern and stomatal size indicated that northernmost populations of Eriotheca STSC (E. estevesiae) are diploid and sexual. Southernmost populations, mostly polyembryonic and with large stomata, are hexaploid and apomictic. This is in agreement with geographic parthenogenesis and range expansion of apomictic lineages to southern habitats available after the last glacial maximum.
67.
68.
de Souza Machado Fernanda Marinho Jéssica Pereira Abujamra Ana Lúcia Dani Caroline Quincozes-Santos André Funchal Cláudia 《Neurochemical research》2015,40(9):1976-1983
Neurochemical Research - Acai offers health benefits associated with its high antioxidante capacity, phytochemical composition, nutritional and sensory value. Therefore, the objective of this study... 相似文献
69.
Marco Tulio R. Gomes Erika S. Guimares Fabio V. Marinho Isabella Macedo Eric R. G. R. Aguiar Glen N. Barber Pedro M. M. Moraes-Vieira Jos Carlos Alves-Filho Sergio C. Oliveira 《PLoS pathogens》2021,17(5)
Macrophages metabolic reprogramming in response to microbial insults is a major determinant of pathogen growth or containment. Here, we reveal a distinct mechanism by which stimulator of interferon genes (STING), a cytosolic sensor that regulates innate immune responses, contributes to an inflammatory M1-like macrophage profile upon Brucella abortus infection. This metabolic reprogramming is induced by STING-dependent stabilization of hypoxia-inducible factor-1 alpha (HIF-1α), a global regulator of cellular metabolism and innate immune cell functions. HIF-1α stabilization reduces oxidative phosphorylation and increases glycolysis during infection with B. abortus and, likewise, enhances nitric oxide production, inflammasome activation and IL-1β release in infected macrophages. Furthermore, the induction of this inflammatory profile participates in the control of bacterial replication since absence of HIF-1α renders mice more susceptible to B. abortus infection. Mechanistically, activation of STING by B. abortus infection drives the production of mitochondrial reactive oxygen species (mROS) that ultimately influences HIF-1α stabilization. Moreover, STING increases the intracellular succinate concentration in infected macrophages, and succinate pretreatment induces HIF-1α stabilization and IL-1β release independently of its cognate receptor GPR91. Collectively, these data demonstrate a pivotal mechanism in the immunometabolic regulation of macrophages during B. abortus infection that is orchestrated by STING via HIF-1α pathway and highlight the metabolic reprogramming of macrophages as a potential treatment strategy for bacterial infections. 相似文献
70.
Maria Aurineide Rodrigues Alejandra Matiz Aline Bertinatto Cruz Aline Tiemi Matsumura Cassia Ayumi Takahashi Leonardo Hamachi Lucas Macedo Félix Paula Natália Pereira Sabrina Ribeiro Latansio-Aidar Marcos Pereira Marinho Aidar Diego Demarco Luciano Freschi Helenice Mercier Gilberto Barbante Kerbauy 《Annals of botany》2013,112(1):17-29