全文获取类型
收费全文 | 5413篇 |
免费 | 367篇 |
国内免费 | 43篇 |
专业分类
耳鼻咽喉 | 163篇 |
儿科学 | 123篇 |
妇产科学 | 28篇 |
基础医学 | 765篇 |
口腔科学 | 86篇 |
临床医学 | 499篇 |
内科学 | 1151篇 |
皮肤病学 | 206篇 |
神经病学 | 578篇 |
特种医学 | 329篇 |
外科学 | 957篇 |
综合类 | 24篇 |
一般理论 | 4篇 |
预防医学 | 197篇 |
眼科学 | 63篇 |
药学 | 290篇 |
中国医学 | 8篇 |
肿瘤学 | 352篇 |
出版年
2023年 | 36篇 |
2022年 | 60篇 |
2021年 | 127篇 |
2020年 | 77篇 |
2019年 | 115篇 |
2018年 | 135篇 |
2017年 | 104篇 |
2016年 | 142篇 |
2015年 | 191篇 |
2014年 | 193篇 |
2013年 | 292篇 |
2012年 | 430篇 |
2011年 | 425篇 |
2010年 | 275篇 |
2009年 | 230篇 |
2008年 | 387篇 |
2007年 | 428篇 |
2006年 | 353篇 |
2005年 | 326篇 |
2004年 | 321篇 |
2003年 | 279篇 |
2002年 | 271篇 |
2001年 | 60篇 |
2000年 | 53篇 |
1999年 | 61篇 |
1998年 | 51篇 |
1997年 | 50篇 |
1996年 | 25篇 |
1995年 | 28篇 |
1994年 | 27篇 |
1993年 | 34篇 |
1992年 | 15篇 |
1991年 | 15篇 |
1990年 | 13篇 |
1989年 | 6篇 |
1988年 | 9篇 |
1987年 | 16篇 |
1986年 | 10篇 |
1985年 | 7篇 |
1984年 | 14篇 |
1983年 | 9篇 |
1982年 | 14篇 |
1981年 | 8篇 |
1980年 | 11篇 |
1979年 | 6篇 |
1977年 | 11篇 |
1976年 | 12篇 |
1975年 | 9篇 |
1972年 | 6篇 |
1959年 | 4篇 |
排序方式: 共有5823条查询结果,搜索用时 15 毫秒
1.
2.
Paul Tetteh Asare Nadeeka Bandara Tae-Yong Jeong Sangryeol Ryu Jochen Klumpp Kwang-Pyo Kim 《Archives of virology》2015,160(10):2647-2650
3.
Schmitz Jan Jansen Stefanie Meyer Moritz Hinkelbein Jochen 《Notfall & Rettungsmedizin》2022,25(4):285-293
Notfall + Rettungsmedizin - Tauchunfälle sind vergleichsweise selten und stellen (Erst‑)Helfer vor besondere Herausforderungen. Sie müssen schnell und kompetent behandelt werden, da... 相似文献
4.
A method is presented for 3D MRI in an extended field of view (FOV) based on continuous motion of the patient table and an efficient acquisition scheme. A gradient-echo MR pulse sequence is applied with lateral (left-right (L/R)) frequency-encoding direction and slab selection along the direction of motion. Compensation for the table motion is achieved by a combination of slab tracking and data alignment in hybrid space. The method allows fast k-space coverage to be achieved, especially when a short sampling FOV is chosen along the direction of table motion, as is desirable for good image quality. The method can be incorporated into different acquisitions schemes, including segmented k-space scanning, which allows for contrast variation with the use of magnetization preparation. Head-to-toe images of volunteers were obtained with good quality using 3D spoiled gradient-echo sequences. As an example of magnetization-prepared imaging, fat/water separated images were acquired using chemical shift selective (CHESS) presaturation pulses. 相似文献
5.
6.
Stefan Ockert Hardy Schumacher Dittmar Böckler Katrin Malcherek Jochen Hansmann Jens Allenberg 《Langenbeck's archives of surgery / Deutsche Gesellschaft fur Chirurgie》2007,392(6):725-730
Background and aims Since the introduction of endovascular aortic aneurysm repair (EVAR) for aortic aneurysms, the number of juxtarenal aortic
aneurysms (JRA) has been growing steadily due to selection bias (neck morphology for EVAR). This case-match study compares
the perioperative outcome and midterm results of suprarenally clamped JRA with infrarenal aortic aneurysms (AAA).
Methods From 1997 to 2004, patients who received open surgery with suprarenal clamping for JRA were included in the study and compared
to matched patients with infrarenal clamping (AAA). Measurements analyzed were the in-hospital mortality and morbidity. Midterm
results were obtained through clinical investigation and magnetic resonance angiography imaging.
Results Thirty-five patients (mean age, 68.4 years; 30 male and 5 female) received suprarenal cross-clamping for JRA. The overall
in-hospital mortality for JRA and for the controls (AAA) with elective aortic repair was 4.5% (6.1% JRA; 3% AAA, p = 0.058). The morbidity of JRA was elevated according to the rate of pulmonary complications (p = 0.021) and the need for re-operation (p = 0.019). The mean follow-up time was 2.3 years (range, 8–96 months). At follow-up, 28 patients (80%) from the JRA group
and 29 patients from the AAA group (82.9%) were alive.
Conclusion Open aortic surgery for JRA with the need for suprarenal cross-clamping shows a slightly elevated in-hospital mortality rate
without statistical significance and equal midterm mortality results in comparison with infrarenally clamped aortic aneurysms. 相似文献
7.
8.
9.
The neural mechanisms underlying the high pressure neurologic syndrome (HPNS), which limit man's safe advance to extreme diving depths, are still unclear. This work was aimed at a better understanding of HPNS through study of brainstem auditory-evoked potentials (BAEP). BAEP were repeatedly recorded within 2 experimental chamber dives, Titan VIII (2 divers, maximum depth of 560 msw, compression time to bottom 109 h) and Titan XI (3 divers, maximum depth of 615 msw, compression time to bottom 240 h). Prolongation of the IV/V-complex occurred in 2 divers upon reaching 525 msw during Titan VIII compression and was accompanied by vestibular disturbances and amplitude increases of finger tremor. Both categories of changes--clinical signs and IV/V delay--gradually diminished during a 4-day stay at 545 msw, suggesting that they depended on excessive compression rates and insufficient acclimation time. Longer holding times at intermittent depths during Titan XI clearly reduced both HPNS symptoms and magnitude of prolongation of IV/V latencies. Wave I and wave III latency did not significantly change, pointing to a suppression of pontomesencephalic transmission. We infer that pressure suppresses synaptic transmission or triggers an increase of cortical or subcortical efferent inhibitory modulation of upper pontine and midbrain auditory afferents. Postdive controls revealed no persistent changes of BAEP measures in either the Titan VIII or XI divers. 相似文献
10.
Imaging of activated microglia with PET and [11C]PK 11195 in corticobasal degeneration. 总被引:3,自引:0,他引:3
Karsten Henkel Jochen Karitzky Michaela Schmid Irina Mader Gerhard Glatting Jürgen W Unger Bernd Neumaier Albert C Ludolph Sven N Reske G Bernhard Landwehrmeyer 《Movement disorders》2004,19(7):817-821
Positron emission tomography (PET) using [(11)C]PK 11195, a ligand for peripheral benzodiazepine receptor binding sites, offers the opportunity to image activated microglia in vivo. This tool may therefore be used to display the occurrence of microglial activation in the course of neurodegeneration. A patient with the clinical diagnosis of corticobasal degeneration (CBD) and left-sided symptoms was studied using fluorodeoxyglucose (FDG) and [(11)C]PK 11195 PET. We found a marked right hemispheric hypometabolism and asymmetric microglial activation in corresponding areas of the basal ganglia and right temporal and parietal cortex. [(11)C]PK 11195 PET suggests involvement of microglial activation in the pathogenesis of CBD. 相似文献