全文获取类型
收费全文 | 3956篇 |
免费 | 260篇 |
国内免费 | 15篇 |
专业分类
耳鼻咽喉 | 23篇 |
儿科学 | 235篇 |
妇产科学 | 68篇 |
基础医学 | 479篇 |
口腔科学 | 164篇 |
临床医学 | 411篇 |
内科学 | 666篇 |
皮肤病学 | 81篇 |
神经病学 | 225篇 |
特种医学 | 422篇 |
外科学 | 465篇 |
综合类 | 101篇 |
一般理论 | 2篇 |
预防医学 | 337篇 |
眼科学 | 135篇 |
药学 | 175篇 |
中国医学 | 2篇 |
肿瘤学 | 240篇 |
出版年
2021年 | 36篇 |
2019年 | 40篇 |
2018年 | 52篇 |
2017年 | 31篇 |
2016年 | 39篇 |
2015年 | 61篇 |
2014年 | 74篇 |
2013年 | 85篇 |
2012年 | 176篇 |
2011年 | 170篇 |
2010年 | 110篇 |
2009年 | 90篇 |
2008年 | 114篇 |
2007年 | 145篇 |
2006年 | 179篇 |
2005年 | 129篇 |
2004年 | 122篇 |
2003年 | 140篇 |
2002年 | 137篇 |
2001年 | 126篇 |
2000年 | 159篇 |
1999年 | 119篇 |
1998年 | 72篇 |
1997年 | 57篇 |
1996年 | 55篇 |
1995年 | 53篇 |
1994年 | 41篇 |
1993年 | 35篇 |
1992年 | 73篇 |
1991年 | 65篇 |
1990年 | 69篇 |
1989年 | 94篇 |
1988年 | 80篇 |
1987年 | 95篇 |
1986年 | 86篇 |
1985年 | 72篇 |
1984年 | 51篇 |
1983年 | 51篇 |
1982年 | 47篇 |
1981年 | 42篇 |
1979年 | 75篇 |
1978年 | 45篇 |
1977年 | 43篇 |
1976年 | 38篇 |
1975年 | 54篇 |
1974年 | 51篇 |
1973年 | 41篇 |
1972年 | 44篇 |
1971年 | 45篇 |
1970年 | 35篇 |
排序方式: 共有4231条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
The purpose of this study is to show the spectrum of adjacent organ invasion and to make a brief review of hepatic alveolar hydatid disease (AHD), using CT and MR imaging. We retrospectively reviewed CT and MR images of three patients with various adjacent organ invasions surgically and histologically proven to be AHD. Local invasion to right kidney and adrenal, right hemidiaphragm and lung were detected in one patient, right adrenal in another patient and gall bladder, duodenum, gastric wall and pancreas invasion in the other. AHD may rarely extend to the gall bladder, stomach, duodenum, pancreas, right adrenal and kidney, diaphragm, pleura and lung. The extension of the disease outside the liver is usually encountered in patients with large, peripherally located masses in the advanced stage of the disease. 相似文献
5.
6.
7.
The axillary arch is reported to occur in 7% of the population, but in our experience has only been observed in 0.25%. The anatomical features are described and its importance in axillary dissection is indicated. In addition, its relevance to the prevention of lymphoedema and to the construction of latissimus dorsi flaps is discussed. The axillary arch should be considered in the differential diagnosis of axillary swellings. 相似文献
8.
Extreme bradycardia during sleep apnea caused by myxedema 总被引:1,自引:0,他引:1
A 52-year-old man with myxedema was evaluated for anterior chest pain that was considered to be compatible with myocardial ischemia. The night after admission he developed extreme bradycardia, hypotension, and apneic episodes lasting up to 25 s. Continuous positive airway pressure and administration of medroxyprogesterone acetate prevented further episodes and relieved much of the somnolence and lethargy that had contributed to the evidence for myxedema. Alveolar hypoventilation caused by decreased sensitivity to carbon dioxide, inadequate central neural drive, peripheral muscle force, and obesity all may have contributed to the apnea. Chest pain has not recurred, and results of electrocardiography have remained normal following full thyroid hormone replacement. The early recognition of myxedema causing sleep apnea will allow specific treatment to avoid the cardiovascular risks related to prolonged apnea and will help avoid confusion with other etiologies of cardiovascular abnormalities. 相似文献
9.
C McKenzie BAppSc P Megaw BAppSc I Morgan PhD MK Boelen PhD 《Clinical & experimental ophthalmology》1997,25(4):79-81
Deprivation of form vision by the fitting of translucent occluders suppressed the diurnal cycling of enkephalinergic amacrine cells (the ENSLI amacrine cells), in the chicken. Daily periods of normal vision or enforcing temporal contrast using strobe lighting appeared to restore normal functioning of the ENSLI cells. These results suggest that the ENSLI cells are involved in retinal circuits that assess the quality of the visual image and control eye growth. 相似文献
10.
N Panjwani B Clark M Cohen M Barza J Baum 《Investigative ophthalmology & visual science》1990,31(4):696-701
Adherence of bacteria to corneal epithelium is a prerequisite for corneal infection. We used two methods to study the binding of Pseudomonas aeruginosa and Staphylococcus aureus to rabbit corneal epithelial cells in culture. In the first method, rabbit corneal epithelial cells grown on glass slides were incubated with P. aeruginosa or S. aureus (10(7) CFU/ml) at room temperature for 90 min, and the bacterial binding to the epithelial cells was examined by light microscopy. Both P. aeruginosa and S. aureus bound to epithelial cells. P. aeruginosa was bound to the cell periphery whereas S. aureus was bound randomly to the cell surface. In the second method, suspension cultures of corneal epithelial cells were used. In contrast to the findings in cultures on slides, binding pattern with cells in suspension was similar for both species and resembled that for S. aureus in cultures on slides. A much greater number of P. aeruginosa (186 +/- 11 bacteria/epithelial cell) than S. aureus (30 +/- 1.5 bacteria/epithelial cell) bound to epithelial cells grown on glass slides. In contrast, a similar number of P. aeruginosa (25 +/- 5.1) and S. aureus (20 +/- 4.7) bound to epithelial cells grown in suspension cultures. Using either method, Escherichia coli and Streptococcus pyogenes did not bind significantly (less than 5/cell) to corneal epithelial cells. The above methods should prove useful for characterization of bacterial binding to corneal epithelial cells in culture. 相似文献