全文获取类型
收费全文 | 1442243篇 |
免费 | 109797篇 |
国内免费 | 4756篇 |
专业分类
耳鼻咽喉 | 18166篇 |
儿科学 | 46330篇 |
妇产科学 | 38383篇 |
基础医学 | 211676篇 |
口腔科学 | 38299篇 |
临床医学 | 140324篇 |
内科学 | 280083篇 |
皮肤病学 | 27876篇 |
神经病学 | 121340篇 |
特种医学 | 52609篇 |
外国民族医学 | 366篇 |
外科学 | 201911篇 |
综合类 | 30425篇 |
现状与发展 | 2篇 |
一般理论 | 623篇 |
预防医学 | 124468篇 |
眼科学 | 31476篇 |
药学 | 106467篇 |
8篇 | |
中国医学 | 3324篇 |
肿瘤学 | 82640篇 |
出版年
2021年 | 12923篇 |
2019年 | 13544篇 |
2018年 | 18667篇 |
2017年 | 13966篇 |
2016年 | 15035篇 |
2015年 | 17344篇 |
2014年 | 23969篇 |
2013年 | 37037篇 |
2012年 | 51306篇 |
2011年 | 54450篇 |
2010年 | 31321篇 |
2009年 | 28780篇 |
2008年 | 49461篇 |
2007年 | 52311篇 |
2006年 | 52074篇 |
2005年 | 50600篇 |
2004年 | 48328篇 |
2003年 | 45853篇 |
2002年 | 44480篇 |
2001年 | 61899篇 |
2000年 | 63348篇 |
1999年 | 53380篇 |
1998年 | 15918篇 |
1997年 | 14357篇 |
1996年 | 14143篇 |
1995年 | 13450篇 |
1994年 | 12481篇 |
1993年 | 11746篇 |
1992年 | 42247篇 |
1991年 | 41448篇 |
1990年 | 40047篇 |
1989年 | 37937篇 |
1988年 | 35195篇 |
1987年 | 34279篇 |
1986年 | 32769篇 |
1985年 | 31322篇 |
1984年 | 23776篇 |
1983年 | 20286篇 |
1982年 | 12688篇 |
1981年 | 11223篇 |
1979年 | 21315篇 |
1978年 | 15356篇 |
1977年 | 12560篇 |
1976年 | 12315篇 |
1975年 | 12483篇 |
1974年 | 15198篇 |
1973年 | 14846篇 |
1972年 | 13598篇 |
1971年 | 12687篇 |
1970年 | 11715篇 |
排序方式: 共有10000条查询结果,搜索用时 265 毫秒
71.
72.
73.
Nevo N. Goldstein A. L. Staierman M. Eran N. Carmeli I. Rayman S. mnouskin Y. 《Hernia》2022,26(6):1491-1499
Hernia - The minimally invasive surgical repair of combined inguinal and ventral hernias often requires shifting from one approach or plane to another. The traditional enhanced-view totally... 相似文献
74.
James Milligan Joseph Lee Matt Smith Lindsay Donaldson Peter Athanasopoulos Kent Bassett-Spiers 《The journal of spinal cord medicine》2020,43(2):223-233
Context: Persons with spinal cord injury (SCI) experience significant challenges when they access primary care and community services.Design: A provincial summit was held to direct research, education, and innovation for primary and community care for SCI.Setting: Toronto, Ontario, Canada.Participants: Key stakeholders (N?=?95) including persons with SCI and caregivers, clinicians from primary care, rehabilitation, and specialized care, researchers, advocacy groups, and policy makers.Methods: A one-day facilitated meeting that included guest speakers, panel discussions and small group discussions was held to generate potential solutions to current issues related to SCI care and to foster collaborative relationships to advance care for SCI. Perspectives on SCI management were shared by primary care, neurosurgery, rehabilitation, and members of the SCI communityOutcome Measures: Discussions were focused on five domains: knowledge translation and dissemination, application of best practices, communication, research, and patient service accessibility.Results: Summit participants identified issues and prioritized solutions to improve primary and community care including the creation of a network of key stakeholders to enable knowledge creation and dissemination; an online repository of SCI resources, integrated health records, and a clinical network for SCI care; development and implementation of strategies to improve care transitions across sectors; implementation of effective care models and improved access to services; and utilization of empowerment frameworks to support self-management.Conclusions: This summit identified priorities for further collaborative efforts to advance SCI primary and community care and will inform the development of a provincial SCI strategy aimed at improving the system of care for SCI. 相似文献
75.
76.
77.
Anuj Shrestha Zeeshan Jawa Kathryn L. Koch Amy B. Rankin Qun Xiang Anand Padmanabhan Matthew S. Karafin Joshua J. Field 《Journal of clinical apheresis》2015,30(6):353-358
Red cell exchange (RCE) is a common procedure in adults with sickle cell disease (SCD). Implantable dual lumen Vortex (DLV) ports can be used for RCE in patients with poor peripheral venous access. We performed a retrospective cohort study of RCE procedures performed in adults with SCD. The main objective of the study was to compare the inlet speed, duration of procedures and rate of complications performed through DLV ports to those performed through temporary central venous and peripheral catheters. Twenty‐nine adults with SCD underwent a total of 318 RCE procedures. Twenty adults had DLV ports placed and 218 procedures were performed using DLV ports. Mean length of follow‐up after DLV port placement was 397 ± 263 days. Six DLV ports were removed due to infection and 1 for malfunction after a mean of 171 ± 120 days. Compared to temporary central venous and peripheral catheters, DLV port procedures had a greater rate of procedural complications, a longer duration, and a lower inlet speed (all P < 0.01). When accounting for the maximum allowable inlet speed to avoid citrate toxicity, 40% of DLV port procedures were greater than 10% below maximum speed, compared to 7 and 14% of procedures performed through temporary central venous and peripheral catheters (P < 0.0001). In conclusion, DLV ports can be used for RCE in adults with SCD, albeit with more procedural complications and longer duration. The smaller internal diameter and longer catheter of DLV ports compared to temporary central venous catheters likely accounts for the differences noted. J. Clin. Apheresis 30:353–358, 2015. © 2015 Wiley Periodicals, Inc. 相似文献
78.
79.
Krishna Pillai Javid Akhter Terence C. Chua Mena Shehata Nayef Alzahrani Issan Al-Alem David L. Morris 《Medicine》2015,94(9)
Thermal ablation of liver tumors near large blood vessels is affected by the cooling effect of blood flow, leading to incomplete ablation. Hence, we conducted a comparative investigation of heat sink effect in monopolar (MP) and bipolar (BP) radiofrequency ablation (RFA), and microwave (MW) ablation devices.With a perfused calf liver, the ablative performances (volume, mass, density, dimensions), with and without heat sink, were measured. Heat sink was present when the ablative tip of the probes were 8.0 mm close to a major hepatic vein and absent when >30 mm away. Temperatures (T1 and T2) on either side of the hepatic vein near the tip of the probes, heating probe temperature (T3), outlet perfusate temperature (T4), and ablation time were monitored.With or without heat sink, BP radiofrequency ablated a larger volume and mass, compared with MP RFA or MW ablation, with latter device producing the highest density of tissue ablated. MW ablation produced an ellipsoidal shape while radiofrequency devices produced spheres.Percentage heat sink effect in Bipolar radiofrequency : Mono-polar radiofrequency : Microwave was (Volume) 33:41:22; (mass) 23:56:34; (density) 9.0:26:18; and (relative elipscity) 5.8:12.9:1.3, indicating that BP and MW devices were less affected.Percentage heat sink effect on time (minutes) to reach maximum temperature (W) = 13.28:9.2:29.8; time at maximum temperature (X) is 87:66:16.66; temperature difference (Y) between the thermal probes (T3) and the temperature (T1 + T2)/2 on either side of the hepatic vessel was 100:87:20; and temperature difference between the (T1 + T2)/2 and temperature of outlet circulating solution (T4), Z was 20.33:30.23:37.5.MW and BP radiofrequencies were less affected by heat sink while MP RFA was the most affected. With a single ablation, BP radiofrequency ablated a larger volume and mass regardless of heat sink. 相似文献
80.