全文获取类型
收费全文 | 4020469篇 |
免费 | 284166篇 |
国内免费 | 9067篇 |
专业分类
耳鼻咽喉 | 55861篇 |
儿科学 | 131684篇 |
妇产科学 | 110607篇 |
基础医学 | 573515篇 |
口腔科学 | 112019篇 |
临床医学 | 370119篇 |
内科学 | 775590篇 |
皮肤病学 | 92902篇 |
神经病学 | 325786篇 |
特种医学 | 152083篇 |
外国民族医学 | 1141篇 |
外科学 | 600533篇 |
综合类 | 83650篇 |
现状与发展 | 15篇 |
一般理论 | 1602篇 |
预防医学 | 314653篇 |
眼科学 | 93668篇 |
药学 | 296170篇 |
16篇 | |
中国医学 | 7855篇 |
肿瘤学 | 214233篇 |
出版年
2019年 | 32267篇 |
2018年 | 44626篇 |
2017年 | 33826篇 |
2016年 | 38893篇 |
2015年 | 43799篇 |
2014年 | 61174篇 |
2013年 | 92659篇 |
2012年 | 124853篇 |
2011年 | 132579篇 |
2010年 | 79744篇 |
2009年 | 75842篇 |
2008年 | 124109篇 |
2007年 | 131941篇 |
2006年 | 133872篇 |
2005年 | 129190篇 |
2004年 | 124307篇 |
2003年 | 119813篇 |
2002年 | 115875篇 |
2001年 | 183119篇 |
2000年 | 187965篇 |
1999年 | 158924篇 |
1998年 | 47190篇 |
1997年 | 41476篇 |
1996年 | 41628篇 |
1995年 | 40013篇 |
1994年 | 36751篇 |
1993年 | 34576篇 |
1992年 | 124634篇 |
1991年 | 120815篇 |
1990年 | 117507篇 |
1989年 | 113896篇 |
1988年 | 104813篇 |
1987年 | 102721篇 |
1986年 | 96716篇 |
1985年 | 92692篇 |
1984年 | 69296篇 |
1983年 | 59000篇 |
1982年 | 35177篇 |
1981年 | 31677篇 |
1979年 | 62889篇 |
1978年 | 44720篇 |
1977年 | 37761篇 |
1976年 | 35545篇 |
1975年 | 37965篇 |
1974年 | 45282篇 |
1973年 | 43145篇 |
1972年 | 40606篇 |
1971年 | 38140篇 |
1970年 | 35117篇 |
1969年 | 33798篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
901.
902.
903.
904.
LUMBOVERTEBRAL SYNDROME AFTER EXTRADURAL BLOOD PATCH 总被引:2,自引:1,他引:1
We describe a patient who developed an immobilizing lumbovertebralsyndrome after an extradural blood patch and who was hospitalizedwith a. suspected extradural abscess. An infectious aetiologyof the persistent backache could be excluded and the patientrecovered with analgesics and physiotherapy. The probable aetiologyis discussed. 相似文献
905.
The purpose of this study was to measure the muscle activity during performance of the anti-G straining maneuver (AGSM) at high sustained acceleration stress (+Gz = head-to-foot inertial loading). Ten males were exposed on three separation occasions to a rapid onset rate of 6 + Gz. Subjects wore standard United States Air Force (USAF) anti-G trousers and performed the AGSM until perceived fatigue or until achieving light loss criteria. During each exposure, surface electromyography (EMG) was recorded from the erector spinae, external oblique, bicep femoris, vastus lateralis, and lateral gastrocnemius muscles. The normalized root-mean squares (RMS) and mean power frequency (MPF) for each muscle were calculated and tested for significant differences with an analysis of variance (ANOVA) procedure. The results of this study showed that mean amplitude decreased during the AGSM (35.40%) while MPF showed no significant change. The EMG amplitude of lower extremity muscles decreased (61.45%) while the amplitude of trunk muscles decreased slightly (3.45%). These results indicate that during the performance of the AGSM, motor unit recruitment in lower extremity muscles decrease without evidence of fatigue. 相似文献
906.
907.
908.
909.
Van Landeghem G; Haese P; Lamberts L; Barata J; DeBroe M 《Nephrology, dialysis, transplantation》1997,12(8):1692-1698
Background: The association between aluminium and
dialysis encephalopathy and deterioration of the neurological state during
desferrioxamine treatment of dialysis patients is well established. At
present little is known about the speciation and the mechanisms underlying
the element's neurotoxicity. Methods. Aluminium speciation was performed in
cerebrospinal fluid samples of acutely aluminium-intoxicated dialysis
patients using a recently developed high-performance liquid
chromatographic/electro-thermal atomic absorption spectrometric hybrid
method. Results: Baseline cerebrospinal fluid
aluminium levels of samples taken shortly after the intoxication were low
but elevated (5.0±2.0 &mgr;g/l, n=3) as compared to subjects
with normal renal function (<1 &mgr;g/l). In contrast to the
situation noted in serum and to the iron speciation in cerebrospinal fluid,
aluminium was not bound to transferrin but appeared as two distinct
compounds, the main fraction eluting at the elution volume of aluminium
citrate/silicate. The second compound was not identified. Forty-four hours
after desferrioxamine administration the cerebrospinal fluid aluminium
levels had increased up to a concentration of 10.3±2.5
&mgr;g/l (n=3). This was accompanied by a change in the speciation
profile with aluminium appearing at the elution volume of aluminoxamine.
Conclusion: Our findings may contribute to a better
understanding of the neurotoxic effects of aluminium and its
desferrioxamine chelate in dialysis patients. 相似文献
910.
To date, only 10 cases of distal penile gangrene in patients with chronic renal failure have been reported. This rare condition is believed to result from progressive vascular calcification due to secondary hyperparathyroidism in patients with chronic renal failure. We report an additional case of distal penile gangrene in a 41-year-old man who presented with chronic renal disease and pulmonary tuberculosis. Since some authors have emphasized that aggressive surgical treatment in such cases has a significant mortality rate, we took a more conservative approach to treatment. 相似文献