全文获取类型
收费全文 | 4406篇 |
免费 | 182篇 |
国内免费 | 38篇 |
专业分类
耳鼻咽喉 | 128篇 |
儿科学 | 214篇 |
妇产科学 | 121篇 |
基础医学 | 301篇 |
口腔科学 | 157篇 |
临床医学 | 333篇 |
内科学 | 1078篇 |
皮肤病学 | 76篇 |
神经病学 | 302篇 |
特种医学 | 185篇 |
外科学 | 973篇 |
综合类 | 90篇 |
一般理论 | 1篇 |
预防医学 | 205篇 |
眼科学 | 100篇 |
药学 | 167篇 |
中国医学 | 9篇 |
肿瘤学 | 186篇 |
出版年
2023年 | 42篇 |
2022年 | 59篇 |
2021年 | 125篇 |
2020年 | 69篇 |
2019年 | 98篇 |
2018年 | 125篇 |
2017年 | 73篇 |
2016年 | 141篇 |
2015年 | 132篇 |
2014年 | 155篇 |
2013年 | 252篇 |
2012年 | 340篇 |
2011年 | 329篇 |
2010年 | 178篇 |
2009年 | 158篇 |
2008年 | 330篇 |
2007年 | 346篇 |
2006年 | 357篇 |
2005年 | 315篇 |
2004年 | 286篇 |
2003年 | 216篇 |
2002年 | 185篇 |
2001年 | 18篇 |
2000年 | 19篇 |
1999年 | 16篇 |
1998年 | 6篇 |
1997年 | 6篇 |
1996年 | 10篇 |
1995年 | 5篇 |
1992年 | 17篇 |
1991年 | 7篇 |
1990年 | 11篇 |
1989年 | 7篇 |
1988年 | 15篇 |
1987年 | 13篇 |
1986年 | 16篇 |
1985年 | 24篇 |
1984年 | 12篇 |
1983年 | 8篇 |
1982年 | 9篇 |
1981年 | 6篇 |
1980年 | 6篇 |
1979年 | 13篇 |
1978年 | 8篇 |
1976年 | 5篇 |
1974年 | 8篇 |
1972年 | 8篇 |
1970年 | 4篇 |
1969年 | 6篇 |
1968年 | 6篇 |
排序方式: 共有4626条查询结果,搜索用时 15 毫秒
41.
Transcranial Doppler: Does Addition of Blood to Agitated Saline Affect Sensitivity for Detecting Cardiac Right‐to‐Left Shunt?
下载免费PDF全文
![点击此处可从《Echocardiography (Mount Kisco, N.Y.)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Mohammad Khalid Mojadidi M.D. Lili Zhang M.D. Yashasvi Chugh M.D. Parham Eshtehardi M.D. F.A.H.A. Ninel Hovnanians M.D. Rubine Gevorgyan M.D. Sanaullah Mojaddedi B.S. Nariman Nezami M.D. Muhammad Omer Zaman M.D. Asim Rafique M.D. Pedro A. Villablanca M.D. M.Sc. Jonathan M. Tobis M.D. F.A.C.C. 《Echocardiography (Mount Kisco, N.Y.)》2016,33(8):1219-1227
42.
Omer Onur Cakir Fabio Castiglione Zafer Tandogdu Justin Collins Hussain M. Alnajjar Clare Akers Maarten Albersen Constantine Alifrangis Benjamin Ayres Oscar Brouwer Ivor Cullen Peter Hawkey Jakob Kristian Jakobsen Truls Erik Bjerklund Johansen Odunayo Kalejaiye Asheesh Kaul Bela Köves Vivekanandan Kumar Asif Muneer 《Urologic oncology》2021,39(3):197.e9-197.e17
ObjectivesTo develop an international consensus on managing penile cancer patients during the COVID-19 acute waves. A major concern for patients with penile cancer during the coronavirus disease 2019 (COVID-19) pandemic is how the enforced safety measures will affect their disease management. Delays in diagnosis and treatment initiation may have an impact on the extent of the primary lesion as well as the cancer-specific survival because of the development and progression of inguinal lymph node metastases.Materials and methodsA review of the COVID-19 literature was conducted in conjunction with analysis of current international guidelines on the management of penile cancer. Results were presented to an international panel of experts on penile cancer and infection control by a virtual accelerated Delphi process using 4 survey rounds. Consensus opinion was defined as an agreement of ≥80%, which was used to reconfigure management pathways for penile cancer.ResultsLimited evidence is available for delaying penile cancer management. The consensus rate of agreement was 100% that penile cancer pathways should be reconfigured, and measures should be developed to prevent perioperative nosocomial transmission of COVID-19. The panel also reached a consensus on several statements aimed at reconfiguring the management of penile cancer patients during the COVID-19 pandemic.ConclusionsThe international consensus panel proposed a framework for the diagnostic and invasive therapeutic procedures for penile cancer within a low-risk environment for COVID-19. 相似文献
43.
44.
45.
46.
Omer Burak Argun Panagiotis Mourmouris Ilter Tufek Can Obek Mustafa Bilal Tuna Selcuk Keskin Ali Riza Kural 《JSLS, Journal of the Society of Laparoendoscopic Surgeons》2016,20(2)
Methods:Data on 11 robot-assisted laparoscopic partial nephrectomies performed by using our technique from February 2015 through June 2015 were retrospectively analyzed. The robotic platform used was DaVinci Xi (Intuitive Surgical, Inc., Sunnyvale, California, USA) with a 3-arm setup. The AirSeal system (SurgiQuest, Milford, Connecticut, USA) was used as a port allowing simultaneous introduction of 2 instruments for the bedside surgeon, obviating the need for an additional (fourth) robotic arm. A long suction-and-irrigation device and atraumatic grasping forceps were used. Both instruments were introduced through the trocar of the AirSeal system, making simultaneous introduction and use possible. We preferred the long suction-and-irrigation device, because it minimizes collision of the instruments.Results:Mean age and BMI of the patients were 55 ±14.6 y and 29.18 ± 6.85, respectively. Seven tumors were on the right side and 4 were on the left. The mean size of the tumors was 32.45 mm (± 11.31). Surgical time was 132.2 minutes (±37.17), with an estimated blood loss and ischemia time of 103.63 mL (±65.92) and 16.72 minutes (±9.52), respectively. One patient had postoperative bleeding that was resolved without transfusion. The median hospitalization period was 3.9 d (±0.53). Loss of intra-abdominal pressure was not observed, and pressure was stable at 10 mm Hg.Conclusion:The AirSeal System and its valveless trocar eliminated the need for an additional port placement in our series. The technique is feasible, safe, and reproducible; therefore, it may be implemented in selected cases of robot-assisted partial nephrectomies. 相似文献
47.
48.
49.
Sabyasachi Rakshit Yunxiang Zhang Kristine Manibog Omer Shafraz Sanjeevi Sivasankar 《Proceedings of the National Academy of Sciences of the United States of America》2012,109(46):18815-18820
Classical cadherin cell-cell adhesion proteins play key morphogenetic roles during development and are essential for maintaining tissue integrity in multicellular organisms. Classical cadherins bind in two distinct conformations, X-dimer and strand-swap dimer; during cellular rearrangements, these adhesive states are exposed to mechanical stress. However, the molecular mechanisms by which cadherins resist tensile force and the pathway by which they convert between different conformations are unclear. Here, we use single molecule force measurements with an atomic force microscope (AFM) to show that E-cadherin, a prototypical classical cadherin, forms three types of adhesive bonds: catch bonds, which become longer lived in the presence of tensile force; slip bonds, which become shorter lived when pulled; and ideal bonds that are insensitive to mechanical stress. We show that X-dimers form catch bonds, whereas strand-swap dimers form slip bonds. Our data suggests that ideal bonds are formed as X-dimers convert to strand-swap binding. Catch, slip, and ideal bonds allow cadherins to withstand tensile force and tune the mechanical properties of adhesive junctions. 相似文献
50.