全文获取类型
收费全文 | 1578篇 |
免费 | 108篇 |
国内免费 | 4篇 |
专业分类
耳鼻咽喉 | 7篇 |
儿科学 | 85篇 |
妇产科学 | 24篇 |
基础医学 | 243篇 |
口腔科学 | 84篇 |
临床医学 | 145篇 |
内科学 | 199篇 |
皮肤病学 | 30篇 |
神经病学 | 76篇 |
特种医学 | 186篇 |
外科学 | 146篇 |
综合类 | 69篇 |
预防医学 | 159篇 |
眼科学 | 66篇 |
药学 | 73篇 |
中国医学 | 1篇 |
肿瘤学 | 97篇 |
出版年
2022年 | 10篇 |
2021年 | 27篇 |
2020年 | 12篇 |
2019年 | 18篇 |
2018年 | 25篇 |
2017年 | 17篇 |
2016年 | 23篇 |
2015年 | 38篇 |
2014年 | 33篇 |
2013年 | 27篇 |
2012年 | 61篇 |
2011年 | 62篇 |
2010年 | 44篇 |
2009年 | 37篇 |
2008年 | 56篇 |
2007年 | 68篇 |
2006年 | 60篇 |
2005年 | 50篇 |
2004年 | 47篇 |
2003年 | 42篇 |
2002年 | 50篇 |
2001年 | 42篇 |
2000年 | 44篇 |
1999年 | 35篇 |
1998年 | 42篇 |
1997年 | 30篇 |
1996年 | 35篇 |
1995年 | 31篇 |
1994年 | 21篇 |
1993年 | 23篇 |
1992年 | 47篇 |
1991年 | 23篇 |
1990年 | 26篇 |
1989年 | 41篇 |
1988年 | 43篇 |
1987年 | 47篇 |
1986年 | 42篇 |
1985年 | 38篇 |
1984年 | 26篇 |
1983年 | 21篇 |
1982年 | 19篇 |
1981年 | 13篇 |
1980年 | 8篇 |
1979年 | 11篇 |
1976年 | 9篇 |
1975年 | 17篇 |
1974年 | 9篇 |
1973年 | 7篇 |
1972年 | 7篇 |
1968年 | 7篇 |
排序方式: 共有1690条查询结果,搜索用时 493 毫秒
1.
2.
3.
4.
Others have reported that spinal cord transection non-uniformly affects the activities of the cardiac, renal and splenic nerves. We were unable to confirm this finding while recording the wide band (1-1000 Hz) discharges of these sympathetic nerves in baroreceptor-denervated, chloralose-anesthetized cats. Most of the power in nerve discharges was below 6 Hz. There was high coherence between the low frequency discharges of different nerves, and power below 15 Hz was essentially eliminated by spinal transection. Evidence is presented that the disparities between this and past studies are, in part, due to the use of a 30-Hz high-pass filter in the earlier studies. 相似文献
5.
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
6.
7.
8.
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
9.
We describe a patient with bilateral ureteral pseudodiverticulosis of 10 years’ duration before developing transitional carcinoma of the pelvis. 相似文献
10.
Diagnosis and management (by subxiphoid pericardiotomy) of large pericardial effusions causing cardiac tamponade. 总被引:1,自引:0,他引:1
T C Wall P T Campbell C M O'Connor P Van Trigt R T Kenney K H Sheikh J A Kisslo G R Corey 《The American journal of cardiology》1992,69(12):1075-1078
To determine the clinical features, course and outcome of patients with cardiac tamponade, 57 consecutive patients with new, large pericardial effusions were prospectively studied. Twenty-five patients (44%) developed cardiac tamponade with venous hypertension and a pulsus paradoxus greater than 10 mm Hg. Electrocardiography, radiographic studies and echocardiography did not differentiate patients with and without tamponade. All 57 patients underwent thorough diagnostic evaluation followed by subxiphoid pericardial biopsy and drainage. A diagnosis was obtained in 53 patients (93%). Collagen vascular disease was significantly more frequent in the 25 patients with than in the 32 without cardiac tamponade (24 vs 3%; p less than 0.05). The frequency of malignant and uremic effusions was equal in both groups, whereas radiation-induced effusions seldom produced tamponade. At 1-year follow-up, 3 patients (12%) with tamponade had recurrent effusions, and 1 needed reoperation. This was not significantly different from the 32 patients without tamponade. Twelve-month mortality was also similar in both groups (36 vs 44%). This prospective series disclosed several unexpected findings: (1) Cardiac tamponade occurred in almost 50% of patients with new large pericardial effusions; (2) both malignancy and collagen vascular disease occurred with equal frequency as etiologies, whereas radiation-induced tamponade was unusual; (3) thorough clinical evaluation resulted in few idiopathic etiologies; and (4) subxiphoid pericardiotomy was effective for both diagnosis and therapy of tamponade. 相似文献