全文获取类型
收费全文 | 16542篇 |
免费 | 1095篇 |
国内免费 | 96篇 |
专业分类
耳鼻咽喉 | 178篇 |
儿科学 | 392篇 |
妇产科学 | 276篇 |
基础医学 | 2737篇 |
口腔科学 | 361篇 |
临床医学 | 1420篇 |
内科学 | 3328篇 |
皮肤病学 | 371篇 |
神经病学 | 1558篇 |
特种医学 | 628篇 |
外科学 | 2401篇 |
综合类 | 159篇 |
现状与发展 | 1篇 |
一般理论 | 6篇 |
预防医学 | 1037篇 |
眼科学 | 467篇 |
药学 | 1404篇 |
中国医学 | 52篇 |
肿瘤学 | 957篇 |
出版年
2023年 | 123篇 |
2022年 | 269篇 |
2021年 | 577篇 |
2020年 | 317篇 |
2019年 | 389篇 |
2018年 | 618篇 |
2017年 | 391篇 |
2016年 | 501篇 |
2015年 | 546篇 |
2014年 | 747篇 |
2013年 | 976篇 |
2012年 | 1357篇 |
2011年 | 1526篇 |
2010年 | 811篇 |
2009年 | 597篇 |
2008年 | 867篇 |
2007年 | 848篇 |
2006年 | 799篇 |
2005年 | 774篇 |
2004年 | 660篇 |
2003年 | 615篇 |
2002年 | 578篇 |
2001年 | 170篇 |
2000年 | 155篇 |
1999年 | 163篇 |
1998年 | 149篇 |
1997年 | 132篇 |
1996年 | 98篇 |
1995年 | 100篇 |
1994年 | 97篇 |
1993年 | 69篇 |
1992年 | 79篇 |
1991年 | 68篇 |
1990年 | 69篇 |
1989年 | 57篇 |
1988年 | 56篇 |
1986年 | 48篇 |
1985年 | 59篇 |
1984年 | 62篇 |
1983年 | 59篇 |
1982年 | 78篇 |
1981年 | 67篇 |
1980年 | 69篇 |
1979年 | 55篇 |
1978年 | 51篇 |
1977年 | 59篇 |
1976年 | 54篇 |
1975年 | 57篇 |
1974年 | 44篇 |
1973年 | 53篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Maria Gonzalez-Cao Cristina Carrera Juan Francisco Rodriguez Moreno Pedro Rodríguez-Jiménez Mónica Antoñanzas Basa Rosa Feltes Ochoa Teresa Puertolas Eva Muñoz-Couselo José Luis Manzano Ivan Marquez-Rodas Juan Martín-Liberal Ainara Soria Pilar Lopez Criado Almudena Garcia-Castaño Aram Boada Pablo Ayala de Miguel Susana Puig Guillermo Crespo Alfonso Berrocal 《Journal of the American Academy of Dermatology》2021,84(5):1412-1415
3.
Bielik Peter Bonczek Ondřej Krejčí Přemysl Zeman Tomáš Izakovičová-Hollá Lydie Šoukalová Jana Vaněk Jiří Vojtěšek Bořivoj Lochman Jan Balcar Vladimir J. Šerý Omar 《Clinical oral investigations》2022,26(12):7045-7055
Clinical Oral Investigations - The aim of this study was the analysis of WNT10A variants in seven families of probands with various forms of tooth agenesis and self-reported family history of... 相似文献
4.
Journal of Assisted Reproduction and Genetics - 相似文献
5.
6.
Tarandovskiy Ivan D. Rajabi Ali A. Karnaukhova Elena Buehler Paul W. 《Journal of thrombosis and thrombolysis》2019,48(1):81-87
Journal of Thrombosis and Thrombolysis - C1-inhibitor (C1INH) was shown to enhance thrombin generation (TG) in the presence of thrombomodulin (TM) by reducing production of activated protein C.... 相似文献
7.
8.
Fabian M. Laage Gaupp Nadia Solomon Ivan Rukundo Azza A. Naif Erick M. Mbuguje Anish Gonchigar Minzhi Xing John D. Prologo Douglas D. Silin Frank J. Minja 《Journal of vascular and interventional radiology : JVIR》2019,30(12):2036-2040
Despite a population of nearly 60 million, there is currently not a single interventional radiologist in Tanzania. Based on an Interventional Radiology (IR) Readiness Assessment, the key obstacles to establishing IR in Tanzania are the lack of training opportunities and limited availability of disposable equipment. An IR training program was designed and initiated, which relies on US-based volunteer teams of IR physicians, nurses, and technologists to locally train radiology residents, nurses, and technologists. Preliminary results support this strategy for addressing the lack of training opportunities and provide a model for introducing IR to other resource-limited settings. 相似文献
9.
10.
Sigita Gelman rius Sakalauskas Romanas Zykus rius Pranculis Rytis Jurkonis Irma Kuliavienė Arūnas Lukoševičius Limas Kupčinskas Juozas Kupčinskas 《World journal of gastroenterology : WJG》2020,26(38):5836-5848
BACKGROUND Degree of portal hypertension(PH) is the most important prognostic factor for the decompensation of liver cirrhosis and death, therefore adequate care for patients with liver cirrhosis requires timely detection and evaluation of the presence of clinically significant PH(CSPH) and severe PH(SPH). As the most accurate method for the assessment of PH is an invasive direct measurement of hepatic venous pressure gradient(HVPG), the search for non-invasive methods to diagnose these conditions is actively ongoing.AIM To evaluate the feasibility of parameters of endogenously induced displacements and strain of liver to assess degree of PH.METHODS Of 36 patients with liver cirrhosis and measured HVPG were included in the casecontrol study. Endogenous motion of the liver was characterized by derived parameters of region average tissue displacement signal(dantero, dretro, d RMS) and results of endogenous tissue strain imaging using specific radiofrequency signal processing algorithm. Average endogenous strain μ and standard deviation σ of strain were assessed in the regions of interest(ROI)(1 cm × 1 cm and 2 cm × 2 cm in size) and different frequency subbands of endogenous motion(0-10 Hz and 10-20 Hz).RESULTS Four parameters showed statistically significant(P 0.05) correlation with HVPG measurement. The strongest correlation was obtained for the standard deviation of strain(estimated at 0-10 Hz and 2 cm × 2 cm ROI size). Three parameters showed statistically significant differences between patient groups with CSPH, but only dretro showed significant results in SPH analysis. According to ROC analysis area under the curve(AUC) of the σROI[0…10 Hz, 2 cm × 2 cm] parameter reached 0.71(P = 0.036) for the diagnosis of CSPH; with a cut-off value of 1.28 μm/cm providing 73% sensitivity and 70% specificity. AUC for the diagnosis of CSPH for μROI[0…10 Hz, 1 cm × 1 cm] was 0.78(P = 0.0024); with a cut-off value of 3.92 μm/cm providing 73% sensitivity and 80% specificity. Dretro parameter had an AUC of 0.86(P = 0.0001) for the diagnosis of CSPH and 0.84(P = 0.0001) for the diagnosis of SPH. A cut-off value of-132.34 μm yielded 100% sensitivity for both conditions, whereas specificity was 80% and 72% for CSPH and SPH respectively.CONCLUSION The parameters of endogenously induced displacements and strain of the liver correlated with HVPG and might be used for non-invasive diagnosis of PH. 相似文献