全文获取类型
收费全文 | 6429篇 |
免费 | 382篇 |
国内免费 | 21篇 |
专业分类
耳鼻咽喉 | 60篇 |
儿科学 | 223篇 |
妇产科学 | 65篇 |
基础医学 | 1121篇 |
口腔科学 | 281篇 |
临床医学 | 537篇 |
内科学 | 959篇 |
皮肤病学 | 237篇 |
神经病学 | 702篇 |
特种医学 | 264篇 |
外科学 | 850篇 |
综合类 | 37篇 |
一般理论 | 2篇 |
预防医学 | 251篇 |
眼科学 | 288篇 |
药学 | 467篇 |
中国医学 | 9篇 |
肿瘤学 | 479篇 |
出版年
2023年 | 16篇 |
2022年 | 50篇 |
2021年 | 90篇 |
2020年 | 83篇 |
2019年 | 67篇 |
2018年 | 107篇 |
2017年 | 97篇 |
2016年 | 133篇 |
2015年 | 176篇 |
2014年 | 193篇 |
2013年 | 244篇 |
2012年 | 367篇 |
2011年 | 372篇 |
2010年 | 254篇 |
2009年 | 254篇 |
2008年 | 469篇 |
2007年 | 398篇 |
2006年 | 414篇 |
2005年 | 422篇 |
2004年 | 465篇 |
2003年 | 418篇 |
2002年 | 382篇 |
2001年 | 104篇 |
2000年 | 89篇 |
1999年 | 96篇 |
1998年 | 98篇 |
1997年 | 92篇 |
1996年 | 70篇 |
1995年 | 50篇 |
1994年 | 41篇 |
1993年 | 43篇 |
1992年 | 40篇 |
1991年 | 31篇 |
1990年 | 32篇 |
1989年 | 50篇 |
1988年 | 33篇 |
1987年 | 30篇 |
1986年 | 23篇 |
1985年 | 25篇 |
1984年 | 17篇 |
1983年 | 14篇 |
1982年 | 23篇 |
1981年 | 15篇 |
1980年 | 16篇 |
1979年 | 15篇 |
1978年 | 15篇 |
1977年 | 18篇 |
1974年 | 13篇 |
1973年 | 16篇 |
1972年 | 18篇 |
排序方式: 共有6832条查询结果,搜索用时 31 毫秒
131.
Regulation of 25-hydroxyvitamin D3-1 alpha-hydroxylase and production of 1 alpha,25-dihydroxyvitamin D3 by human dendritic cells
下载免费PDF全文
![点击此处可从《Blood》网站下载免费的PDF全文](/ch/ext_images/free.gif)
25-Hydroxyvitamin D3-1 alpha-hydroxylase (25(OH)D3-1 alpha-hydroxylase), the key enzyme of 1 alpha,25-dihydroxyvitamin D3 (1,25(OH)2D3) production, is expressed in monocyte-derived macrophages (MACs). Here we show for the first time constitutive expression of 25(OH)D3-1 alpha-hydroxylase in monocyte-derived dendritic cells (DCs), which was increased after stimulation with lipopolysaccharide (LPS). Accordingly, DCs showed low constitutive production of 1,25(OH)2D3, but activation by LPS increased 1,25(OH)2D3 synthesis. In addition, 25(OH)D3-1 alpha-hydroxylase expression was found in blood DCs but not in CD34+-derived DCs. Next we analyzed the functional consequences of these results. Addition of 1,25(OH)2D3 at concentrations comparable with those produced by DCs inhibited the allostimulatory potential of DCs during the early phase of DC differentiation. However, terminal differentiation decreased the responsiveness of DCs to 1,25(OH)2D3. In conclusion, DCs are able to produce 1,25(OH)2D3 especially following stimulation with LPS. Terminal maturation renders DCs unresponsive to the effects of 1,25(OH)2D3, but those cells are able to suppress the differentiation of their own precursor cells in a paracrine way through the production of 1,25(OH)2D3. 相似文献
132.
Genome-wide array analysis of normal and malformed human hearts 总被引:1,自引:0,他引:1
133.
Does the average drug exposure in pregnant women affect pregnancy outcome? A comparison of two approaches to estimate the baseline risks of adverse pregnancy outcome
下载免费PDF全文
![点击此处可从《Pharmacoepidemiology and drug safety》网站下载免费的PDF全文](/ch/ext_images/free.gif)
134.
135.
G. Adriana Perez Karen Moomaw Rose Billy A. Caceres Wanda Spurlock Barbara Bowers Barbara Lutz Cynthia Arslanian-Engoren Karin Reuter-Rice Toby Bressler Mona Wicks Diana Taylor Versie Johnson-Mallard Elizabeth Kostas-Polston Teresa Hagan Desiree Bertrand Susan C. Reinhard 《Nursing outlook》2018,66(3):337-340
136.
Red blood cells treated with the amustaline (S‐303) pathogen reduction system: a transfusion study in cardiac surgery
下载免费PDF全文
![点击此处可从《Transfusion》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Veronika Brixner Arndt‐Holger Kiessling Katharina Madlener Markus M. Müller Johannes Leibacher Sarah Dombos Iuliia Weber Hans‐Ulrich Pfeiffer Christof Geisen Michael Schmidt Reinhard Henschler Anne North Norman Huang Nina Mufti Anna Erickson Christine Ernst Salvador Rico Richard J. Benjamin Laurence M. Corash Erhard Seifried 《Transfusion》2018,58(4):905-916
137.
L. Daas N. Szentmáry T. Eppig A. Langenbucher A. Hasenfus M. Roth M. Saeger B. Nölle B. Lippmann D. Böhringer T. Reinhard C. Kelbsch E. Messmer U. Pleyer S. Roters A. Zhivov K. Engelmann J. Schrecker L. Zumhagen H. Thieme R. Darawsha T. Meyer-ter-Vehn B. Dick I. Görsch M. Hermel M. Kohlhaas B. Seitz 《Der Ophthalmologe : Zeitschrift der Deutschen Ophthalmologischen Gesellschaft》2015,112(9):752-763
138.
Summary In a phase I study a cytotoxic activity in the serum of a tumor patient given infusions of synthetic alkyl-lysophospholipid has been demonstrated. Serum samples collected after ALP infusions inhibited 3H-thymidine incorporation by human leukemic cells to an extent that correlated to the dose of ALP administered. Serum taken after the highest dose of ALP given (50 mg/kg body weight) led to complete cell destruction after 72 h in vitro. Whereas cells from the HL60 line were very sensitive to the serum cytotoxicity, K562 cells were much less affected. Cytotoxic activity was found to be cleared from the circulation in a biphasic manner; more than 50% disappeared within 6–8 h but 20–30% was still present after 4 days.Supported by DFG An 111/2 相似文献
139.
Hans Scherübl Friedhelm Raue Reinhard Ziegler 《Journal of cancer research and clinical oncology》1990,116(1):21-23
Summary A group of 20 patients with advanced medullary (MTC) or differentiated thyroid carcinoma (DTC) received a combination chemotherapy of doxorubicin (50 mg/m2), cisplatin (60 mg/m2) and vindesine (3 mg/m2). In the 18 (10 MTC, 8 DTC) evaluable patients only 1 partial remission (in a patient with MTC) and 3 minor responses (in 3 patients with DTC) were observed. These responses lasted for 15, 9, 13, and 22 months, respectively. Three MTC patients suffered from progressive disease and no change was seen in the other 11 patients. Toxicity, including 1 severe case of cardiomyopathy, was considerable. Thus, the combination chemotherapy of doxorubicin, cisplatin and vindesine has failed to prove superior to the commonly applied doxorubicin monotherapy in patients with advanced medullary or differentiated thyroid carcinoma.Abbreviations MTC, DTC
medullary and differentiated thyroid carcinoma
This study was supported by a grant of the German Cancer Research Center (Tumorzentrum Heidelberg/Mannheim) 相似文献
140.
Artur Matysiak Wojciech Kordecki Cezary Sielużycki Norman Zacharias Peter Heil Reinhard König 《Psychophysiology》2013,50(7):627-639
Grand means of time‐varying signals (waveforms) across subjects in magnetoencephalography (MEG) and electroencephalography (EEG) are commonly computed as arithmetic averages and compared between conditions, for example, by subtraction. However, the prerequisite for these operations, homogeneity of the variance of the waveforms in time, and for most common parametric statistical tests also between conditions, is rarely met. We suggest that the heteroscedasticity observed instead results because waveforms may differ by factors and additive terms and follow a mixed model. We propose to apply the asinh‐transformation to stabilize the variance in such cases. We demonstrate the homogeneous variance and the normal distributions of data achieved by this transformation using simulated waveforms, and we apply it to real MEG data and show its benefits. The asinh‐transformation is thus an essential and useful processing step prior to computing and comparing grand mean waveforms in MEG and EEG. 相似文献