全文获取类型
收费全文 | 8117篇 |
免费 | 427篇 |
国内免费 | 45篇 |
专业分类
耳鼻咽喉 | 27篇 |
儿科学 | 136篇 |
妇产科学 | 126篇 |
基础医学 | 1270篇 |
口腔科学 | 270篇 |
临床医学 | 891篇 |
内科学 | 1643篇 |
皮肤病学 | 308篇 |
神经病学 | 1012篇 |
特种医学 | 501篇 |
外科学 | 920篇 |
综合类 | 48篇 |
一般理论 | 4篇 |
预防医学 | 343篇 |
眼科学 | 100篇 |
药学 | 460篇 |
中国医学 | 17篇 |
肿瘤学 | 513篇 |
出版年
2023年 | 39篇 |
2022年 | 58篇 |
2021年 | 125篇 |
2020年 | 82篇 |
2019年 | 102篇 |
2018年 | 138篇 |
2017年 | 119篇 |
2016年 | 105篇 |
2015年 | 175篇 |
2014年 | 235篇 |
2013年 | 346篇 |
2012年 | 502篇 |
2011年 | 540篇 |
2010年 | 341篇 |
2009年 | 324篇 |
2008年 | 536篇 |
2007年 | 531篇 |
2006年 | 564篇 |
2005年 | 584篇 |
2004年 | 506篇 |
2003年 | 507篇 |
2002年 | 486篇 |
2001年 | 109篇 |
2000年 | 66篇 |
1999年 | 96篇 |
1998年 | 128篇 |
1997年 | 102篇 |
1996年 | 89篇 |
1995年 | 72篇 |
1994年 | 58篇 |
1993年 | 61篇 |
1992年 | 45篇 |
1991年 | 45篇 |
1990年 | 29篇 |
1989年 | 30篇 |
1988年 | 33篇 |
1987年 | 25篇 |
1986年 | 21篇 |
1985年 | 35篇 |
1984年 | 20篇 |
1983年 | 20篇 |
1982年 | 43篇 |
1981年 | 32篇 |
1980年 | 21篇 |
1978年 | 27篇 |
1977年 | 19篇 |
1975年 | 20篇 |
1970年 | 17篇 |
1913年 | 22篇 |
1912年 | 18篇 |
排序方式: 共有8589条查询结果,搜索用时 46 毫秒
101.
102.
Monatsschrift Kinderheilkunde - Bei kinderkardiologischen Patienten bzw. Kindern mit angeborenen Herzfehlern werden häufig diagnostische oder therapeutische Prozeduren durchgeführt, die... 相似文献
103.
104.
Philipp Tschandl Hubert Pehamberger Harald Kittler 《Journal der Deutschen Dermatologischen Gesellschaft》2013,11(3):251-256
Background and objectives: The aim of this study is to show data regarding trends in the diagnosis of melanoma over the last ten years by looking at the University Clinic of Dermatology in Vienna as an example. Patients and methods: All excised melanocytic lesions from 1998 to 2008 were included. Results: The ratio of excisions of benign to malignant lesions fell from 7:1 (1998) to 4:1 (2008). The mean percentage of in situ melanomas was 39% in 1998 and did not change significantly over time and no change was seen in tumor thickness of invasive melanomas. The median invasion depth was 0.7 mm in 1998 and 0.65 mm in 2008. The absolute number of diagnosed melanomas did not change significantly over time. Conclusion: The proportion of in situ melanomas was consistently high. Tumor thickness stayed at a low level, whereas the number of excised benign melanocytic lesions decreased significantly. 相似文献
105.
106.
Claudia Matschegewski Susanne Staehlke Harald Birkholz Regina Lange Ulrich Beck Konrad Engel J. Barbara Nebe 《Materials》2012,5(7):1176-1195
Microtexturing of implant surfaces is of major relevance in the endeavor to improve biorelevant implant designs. In order to elucidate the role of biomaterial’s topography on cell physiology, obtaining quantitative correlations between cellular behavior and distinct microarchitectural properties is in great demand. Until now, the microscopically observed reorganization of the cytoskeleton on structured biomaterials has been difficult to convert into data. We used geometrically microtextured silicon-titanium arrays as a model system. Samples were prepared by deep reactive-ion etching of silicon wafers, resulting in rectangular grooves (width and height: 2 µm) and cubic pillars (pillar dimensions: 2 × 2 × 5 and 5 × 5 × 5 µm); finally sputter-coated with 100 nm titanium. We focused on the morphometric analysis of MG-63 osteoblasts, including a quantification of the actin cytoskeleton. By means of our novel software FilaQuant, especially developed for automatic actin filament recognition, we were first able to quantify the alterations of the actin network dependent on the microtexture of a material surface. The cells’ actin fibers were significantly reduced in length on the pillared surfaces versus the grooved array (4–5 fold) and completely reorganized on the micropillars, but without altering the orientation of cells. Our morpho-functional approach opens new possibilities for the data correlation of cell-material interactions. 相似文献
107.
108.
109.
Stefanie Enriquez‐Geppert Tom Eichele Karsten Specht Harald Kugel Christo Pantev Ren J. Huster 《Human brain mapping》2013,34(7):1501-1514
Conflict monitoring and motor inhibition are engaged in the performance of complex tasks. The midcingulate cortex (MCC) has been suggested to detect conflicts, whereas the right inferior frontal cortex (IFC) seems to be of relevance for the inhibition process. The current experiment investigates the neural underpinnings of their interplay via a modified flanker paradigm. Conflict was manipulated by the congruency of flanking stimuli relative to a target (congruent vs. incongruent) and motor inhibition by a within‐trial response change of the initiated response (keep response vs. stop‐change). We used event‐related functional magnetic resonance imaging, decomposition with high model order ICA, and single trial analysis to derive a functional parcellation of the whole‐brain data. Results demonstrate the segmentation of the MCC into anterior and posterior subregions, and of the IFC into the pars opercularis, pars triangularis, and pars orbitalis. The pars opercularis and pars triangularis of the right IFC constituted the foundation of inhibition‐related networks. With high conflict on incongruent trials, activity in the posterior MCC network, as well as in one right IFC network was observed. Stop‐change trials modulated both the MCC as well as networks covering extended parts of the IFC. Whereas conflict processing and inhibition most often are studied separately, this study provides a synopsis of functionally coupled brain regions acting in concert to enable an optimal performance in situations involving interference and inhibition. Hum Brain Mapp, 2013. © 2012 Wiley Periodicals, Inc. 相似文献
110.