全文获取类型
收费全文 | 12971篇 |
免费 | 1254篇 |
国内免费 | 261篇 |
专业分类
耳鼻咽喉 | 134篇 |
儿科学 | 61篇 |
妇产科学 | 31篇 |
基础医学 | 1385篇 |
口腔科学 | 591篇 |
临床医学 | 567篇 |
内科学 | 2119篇 |
皮肤病学 | 263篇 |
神经病学 | 1527篇 |
特种医学 | 337篇 |
外科学 | 1222篇 |
综合类 | 1167篇 |
预防医学 | 701篇 |
眼科学 | 3433篇 |
药学 | 562篇 |
3篇 | |
中国医学 | 175篇 |
肿瘤学 | 208篇 |
出版年
2024年 | 85篇 |
2023年 | 373篇 |
2022年 | 839篇 |
2021年 | 1013篇 |
2020年 | 597篇 |
2019年 | 494篇 |
2018年 | 485篇 |
2017年 | 508篇 |
2016年 | 500篇 |
2015年 | 611篇 |
2014年 | 857篇 |
2013年 | 886篇 |
2012年 | 693篇 |
2011年 | 750篇 |
2010年 | 593篇 |
2009年 | 499篇 |
2008年 | 477篇 |
2007年 | 491篇 |
2006年 | 399篇 |
2005年 | 349篇 |
2004年 | 307篇 |
2003年 | 289篇 |
2002年 | 229篇 |
2001年 | 223篇 |
2000年 | 139篇 |
1999年 | 160篇 |
1998年 | 150篇 |
1997年 | 137篇 |
1996年 | 136篇 |
1995年 | 98篇 |
1994年 | 105篇 |
1993年 | 88篇 |
1992年 | 88篇 |
1991年 | 95篇 |
1990年 | 66篇 |
1989年 | 64篇 |
1988年 | 70篇 |
1987年 | 68篇 |
1986年 | 69篇 |
1985年 | 83篇 |
1984年 | 58篇 |
1983年 | 48篇 |
1982年 | 43篇 |
1981年 | 56篇 |
1980年 | 40篇 |
1979年 | 21篇 |
1978年 | 20篇 |
1977年 | 7篇 |
1976年 | 10篇 |
1973年 | 6篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Pui-Yin Lee Wai-Hong Chen William Ng Chu-Pak Lau 《Catheterization and cardiovascular interventions》2003,60(4):558-561
Subclavian artery lesion that is associated with low complication rate could be treated by percutaneous intervention effectively. However, the success of endovascular therapy for occlusive lesion may be limited by failure to cross with a guidewire. We describe the use of a system using optical coherence reflectometry for navigation and radiofrequency ablation to enable wire passage through subclavian artery occlusion that could not be crossed by conventional guidewires. 相似文献
22.
Neuromuscular transmission as a function of motor unit size in patients with prior poliomyelitis. 总被引:2,自引:0,他引:2
We studied neuromuscular transmission in 16 patients with prior poliomyelitis by measuring single fiber electromyographic (SFEMG) jitter. This was compared with 3 indirect methods of assessing reinnervation: SFEMG fiber density, macro EMG, and the presence of fiber type grouping on muscle biopsy. In patients with acute poliomyelitis before the age of 10, there was a positive correlation between the extent of neuromuscular transmission impairment, demonstrated by increased SFEMG jitter, and the enlargement of the motor unit, as indicated by increased fiber density, increased macro EMG signals, and fiber type grouping on muscle biopsy. However, there was no correlation between any of these parameters and the presence or absence of new symptoms of weakness. These findings suggest that impaired neuromuscular transmission is most common in patients with prior poliomyelitis whose motor units have been maximally enlarged by axonal sprouting, but is independent of the presence or absence of new symptoms of weakness. 相似文献
23.
JUAN N. WALTERSPIEL 《Acta paediatrica (Oslo, Norway : 1992)》1991,80(11):993-998
ABSTRACT. Background: Several designs of plastic blanket heat shields are in use. This study was done to compare different designs for their efficiency in reducing heat loss. Methods: Four heat shield designs were tested by sequentially covering each of 14 infants (wt. 640–2030 g) cared for under radiant warmers. The power consumption of the radiant warmers was measured as a surrogate for. heat loss. All designs were tested for a total of 20 min on all infants. Results were calculated as percent change in power consumption from shield to shield. The most efficient design was further modified and evaluated in another group of 14 infants (wt. 700–1180 g). Results: The relative reductions in power consumption were: no shield (control) –0%, a plastic foil over the side rails: –17%, a single layer close to the infant but excluding the head: –34%, the same as double layer –37% and the most efficient one, a single layer covering the whole infant –42%. A modification of this design, tested in the second group of infants, reduced power consumption by 13% (95% CI –5.9/–19.7), ( p < 0.004) when compared to the single layer covering the whole infant. It was tucked under the connecting tubes to the ventilator. It also reduced the risk for displacement and allowed for the endotracheal tube to be suctioned without removing the blanket. Conclusion: Modifications of the design of heat shield blankets for infants resulted in significant increases in efficiency. 相似文献
24.
目的 通过问卷调查表对患者戴用附着体义齿后的主观感受进行研究.方法 选择上下牙列缺损患者42例,共制作带塑料插入件栓式附着体义齿47例,于戴牙后1个月,患者基本适应戴用义齿,通过问卷调查,了解患者戴用义齿后的适应情况、对义齿的满意程度及咀嚼功能的变化等.结果 患者对带塑料插入件栓式附着体义齿和传统可摘局部义齿两种修复方式比较,在总的满意度、美观、舒适、咀嚼、语言、适应期、食物结构改变等方面,前者明显优于后者,差异有统计学意义.结论 带塑料插入件栓式附着体义齿在美观及功能上不仅能满足患者的要求,而且远优于传统可摘局部义齿. 相似文献
25.
The afferent nervous supply to the thymus gland has been investigated by means of the retrograde transport of horseradish peroxidase. It has been shown that the thymus receives an afferent supply from the nodose ganglia of the vagus and from the dorsal root ganglia C1–C7. The afferent innervation of the right and left thymic lobes is bilaterally organized; the fibers of a small celled population of nodose ganglion neurons cross outside the thymus and those of a larger celled population cross within the thymus gland. The functional implications of these findings are discussed in the context of central nervous system-immune system interactions. 相似文献
26.
Milton T. Edgerton Jr. M.D. Margaretha Willemina Langman ps. dra. Thomas Pruzinsky Ph.D. 《Aesthetic plastic surgery》1990,14(1):59-72
This article describes plastic surgery patients who sought symmetrical recontouring of the width of the face and skull. The basic demographic and personality characteristics of these facial width deformity (FWD) patients and the surgical procedures performed on them are discussed. Details of the surgical and psychological management of three representative cases are given. Speculative conclusions regarding the general characteristics of the FWD population are offered. Suggestions are proposed for a combined surgical-medical psychotherapeutic collaboration in managing these patients. 相似文献
27.
David A. Sloan David M. Fleiszer Geoffrey K. Richards David Murray Rea A. Brown 《Journal of surgical oncology》1993,52(2):77-82
Sixty Sprague-Dawley rats were pair-fed one of three nutritionally identical diets. One diet contained “low-fiber” (3.8% crude fiber); the others contained “high fiber” (28.7% crude fiber) composed of either cellulose or lignin. Although both “high fiber” diets had similar stool bulking effects, only the cellulose diet was associated with a reduction in 1,2-dimethylhydrazine (DMH)-induced colon neoplasms. The cellulose diet was also associated with distinct changes in the gut bacterial profile and with a lowered serum cholesterol. © 1993 Wiley-Liss, Inc. 相似文献
28.
Age, fiber type composition and in vitro contracture responses in human malignant hyperthermia 总被引:1,自引:0,他引:1
Muscle fiber typing and in vitro contracture tests were performed in 59 patients investigated for susceptibility to malignant hyperthermia (MH). Eighteen patients were found to be susceptible to MH. There was no difference in age or fiber type distribution between MH susceptible and non-susceptible patients. No correlation was found between age and fiber type distribution. Separate analyses for each diagnostic group revealed no relationship between age or fiber type distribution and response to halothane or caffeine. When all caffeine results were pooled, however, there was a significant effect of age on the caffeine specific concentration (the concentration eliciting a contracture of 1 g), but not on the caffeine threshold concentration (the minimal concentration eliciting an increase in tension). It is concluded that age and fiber type distribution have no influence on MH diagnosis, if the protocol of the European MH Group for evaluation of susceptibility to MH is followed. 相似文献
29.
通过对10例小儿及23例成年人的喉内肌进行的myosin-ATPase等染色观察,得到小儿和成人各喉内肌不同的肌纤维构成比。成人PCAⅠ型纤维最多,LCA、INA及CT次之,TA最少。小儿的各喉内肌也有类似比例。表明不论小儿或成人,PCA均具有较强的抗疲劳性,适应呼吸作用的需要;TA具有较快的收缩速度,以适应发声及呼吸道保护作用。从纤维构成上看,小儿与成人相比,各喉内肌Ⅰ型纤维较为匮乏,表明小儿的喉在发声及呼吸道保护等功能方面尚不够完善。 相似文献
30.
玻璃纤维增强复合树脂在总义齿基托中的应用 总被引:1,自引:0,他引:1
目的:增强总义齿基托的机械性能,提高总义齿的基托抗折裂能力。方法:对E-玻璃纤维用KH-550处理剂进行表面处理后,加入总义齿基托中,制成玻璃纤维增强复合树脂。结果:经过1年的临床观察后复诊,没有发现裂纹。结论:玻璃纤维增强得合树脂可以有效地增强总义齿基托的机械性能。 相似文献