全文获取类型
收费全文 | 777篇 |
免费 | 42篇 |
国内免费 | 2篇 |
专业分类
耳鼻咽喉 | 8篇 |
儿科学 | 9篇 |
妇产科学 | 7篇 |
基础医学 | 83篇 |
口腔科学 | 12篇 |
临床医学 | 81篇 |
内科学 | 210篇 |
皮肤病学 | 6篇 |
神经病学 | 23篇 |
特种医学 | 130篇 |
外科学 | 145篇 |
综合类 | 9篇 |
预防医学 | 26篇 |
眼科学 | 7篇 |
药学 | 24篇 |
肿瘤学 | 41篇 |
出版年
2022年 | 8篇 |
2021年 | 12篇 |
2019年 | 10篇 |
2018年 | 10篇 |
2016年 | 13篇 |
2015年 | 16篇 |
2014年 | 19篇 |
2013年 | 34篇 |
2012年 | 50篇 |
2011年 | 28篇 |
2010年 | 29篇 |
2009年 | 20篇 |
2008年 | 46篇 |
2007年 | 27篇 |
2006年 | 30篇 |
2005年 | 26篇 |
2004年 | 34篇 |
2003年 | 32篇 |
2002年 | 28篇 |
2001年 | 20篇 |
2000年 | 8篇 |
1999年 | 7篇 |
1998年 | 12篇 |
1997年 | 14篇 |
1996年 | 14篇 |
1995年 | 11篇 |
1994年 | 16篇 |
1993年 | 8篇 |
1992年 | 5篇 |
1991年 | 6篇 |
1990年 | 6篇 |
1989年 | 12篇 |
1988年 | 14篇 |
1987年 | 15篇 |
1986年 | 16篇 |
1985年 | 14篇 |
1984年 | 8篇 |
1983年 | 8篇 |
1982年 | 12篇 |
1981年 | 5篇 |
1980年 | 18篇 |
1976年 | 9篇 |
1975年 | 9篇 |
1973年 | 6篇 |
1972年 | 6篇 |
1971年 | 7篇 |
1970年 | 10篇 |
1968年 | 9篇 |
1967年 | 4篇 |
1966年 | 9篇 |
排序方式: 共有821条查询结果,搜索用时 0 毫秒
1.
2.
3.
The effect of chemical shift on magnetic resonance (MR) imaging of the pituitary fossa was studied. Healthy volunteers underwent conventional MR imaging of the pituitary fossa and then imaging with the frequency-encoding gradient reversed or with the phase- and frequency-encoding gradients interchanged. Comparison of the image pairs in each subject showed that the thin, black stripe evident at the water-fat interface within the pituitary fossa was altered when the gradients were changed. Therefore, the low-intensity signal within the pituitary fossa is a chemical shift misregistration effect. 相似文献
4.
5.
Detection of Human T-Lymphotropic Virus (HTLV) tax Sequences in New York City Blood Donors Seronegative for HTLV Types 1 and 2
下载免费PDF全文
![点击此处可从《Clinical and Vaccine Immunology : CVI》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Charlene S. Dezzutti Patricia C. Guenthner Sylvester Daniel Ursula Utz Thania Cabrera James H. Marshall Celso Bianco Renu B. Lal Elliot P. Cowan 《Clinical and Vaccine Immunology : CVI》2003,10(4):715-717
A potential public health concern is the reported detection of the human T-lymphotropic virus (HTLV) tax gene in the lymphocytes of up to 11% of a low-risk group of New York City blood donors (NYBD). This study aimed to independently confirm the prevalence of HTLV tax sequences in 293 NYBD. All NYBD tested negative for antibodies to HTLV types 1 and 2 and HTLV Tax. HTLV tax sequences were not detected in the NYBD lymphocytes. These data demonstrate the lack of HTLV-1 tax in this group of NYBD at low risk for HTLV infection. 相似文献
6.
Anulus fibrosus in bulging intervertebral disks 总被引:1,自引:0,他引:1
In this investigation the association of radial tears of the anulus fibrosus and bulging of the intervertebral disk was studied. An index of disk bulging was measured in sagittal anatomic sections in 149 lumbar disks from 31 cadavers. The indexes of disk bulging were correlated with stages of disk development and the presence of an annular tear. The largest disk-bulging indexes were always associated with radial tears of the anulus. Eighty-four percent of the disks with radial tears had disk-bulging indexes greater than 2.5 mm. Most normal adult disks had an index of less than 2.5 mm. The results challenge the concept that the anulus fibrosus is intact in bulging disks, although ruptured in herniated disks. 相似文献
7.
8.
Sanjana VM; Johnston PA; Robertson CR; Jamison RL 《The American journal of physiology》1976,231(2):313-318
9.
10.
Dezzutti CS Guenthner PC Daniel S Utz U Cabrera T Marshall JH Bianco C Lal RB Cowan EP 《Clinical and diagnostic laboratory immunology》2003,10(4):715-717
A potential public health concern is the reported detection of the human T-lymphotropic virus (HTLV) tax gene in the lymphocytes of up to 11% of a low-risk group of New York City blood donors (NYBD). This study aimed to independently confirm the prevalence of HTLV tax sequences in 293 NYBD. All NYBD tested negative for antibodies to HTLV types 1 and 2 and HTLV Tax. HTLV tax sequences were not detected in the NYBD lymphocytes. These data demonstrate the lack of HTLV-1 tax in this group of NYBD at low risk for HTLV infection. 相似文献