全文获取类型
收费全文 | 26506篇 |
免费 | 1963篇 |
国内免费 | 85篇 |
专业分类
耳鼻咽喉 | 231篇 |
儿科学 | 756篇 |
妇产科学 | 535篇 |
基础医学 | 3181篇 |
口腔科学 | 388篇 |
临床医学 | 2629篇 |
内科学 | 5211篇 |
皮肤病学 | 713篇 |
神经病学 | 2323篇 |
特种医学 | 1106篇 |
外国民族医学 | 1篇 |
外科学 | 4028篇 |
综合类 | 460篇 |
一般理论 | 60篇 |
预防医学 | 2288篇 |
眼科学 | 856篇 |
药学 | 1810篇 |
中国医学 | 18篇 |
肿瘤学 | 1960篇 |
出版年
2022年 | 146篇 |
2021年 | 350篇 |
2020年 | 229篇 |
2019年 | 347篇 |
2018年 | 434篇 |
2017年 | 369篇 |
2016年 | 399篇 |
2015年 | 455篇 |
2014年 | 706篇 |
2013年 | 1039篇 |
2012年 | 1527篇 |
2011年 | 1582篇 |
2010年 | 913篇 |
2009年 | 829篇 |
2008年 | 1524篇 |
2007年 | 1599篇 |
2006年 | 1587篇 |
2005年 | 1639篇 |
2004年 | 1608篇 |
2003年 | 1504篇 |
2002年 | 1482篇 |
2001年 | 415篇 |
2000年 | 325篇 |
1999年 | 358篇 |
1998年 | 371篇 |
1997年 | 347篇 |
1996年 | 327篇 |
1995年 | 293篇 |
1994年 | 250篇 |
1993年 | 255篇 |
1992年 | 287篇 |
1991年 | 255篇 |
1990年 | 231篇 |
1989年 | 251篇 |
1988年 | 214篇 |
1987年 | 206篇 |
1986年 | 198篇 |
1985年 | 234篇 |
1984年 | 224篇 |
1983年 | 222篇 |
1982年 | 253篇 |
1981年 | 261篇 |
1980年 | 222篇 |
1979年 | 171篇 |
1978年 | 181篇 |
1977年 | 174篇 |
1976年 | 120篇 |
1975年 | 137篇 |
1974年 | 143篇 |
1973年 | 110篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
Splenic Amyloidosis: A Case Report of Spontaneous Splenic Rupture with a Review of the Pertinent Literature 总被引:1,自引:0,他引:1
Orest J. Kozicky M.D. Lawrence J. Brandt M.D. Mel Lederman M.D. Maria Milcu M.D. 《The American journal of gastroenterology》1987,82(6):582-587
A case of spontaneous rupture of the spleen as a complication and presenting factors of systemic amyloidosis is reported with a review of the pertinent literature. the sequelae of amyloid involvement of the spleen is discussed with emphasis on possible mechanisms involved in the causation of spontaneous rupture of this organ. 相似文献
83.
Jonathan M Hodgson Kevin D Croft Trevor A Mori Valerie Burke Lawrence J Beilin Ian B Puddey 《The Journal of nutrition》2002,132(1):55-58
Prospective studies suggest that tea may protect against cardiovascular disease. A potential mechanism for such an effect involves inhibition of lipid peroxidation by polyphenolic antioxidants derived from tea. Our objective was to determine whether regular ingestion of tea could inhibit in vivo lipid peroxidation. Two controlled intervention studies assessed the effects of regular ingestion of tea on lipid peroxidation determined by measurement of urinary F(2)-isoprostane excretion. Study 1: The effects of 1000 mL/d of green tea and black tea were compared with hot water containing caffeine in 13 subjects with elevated blood pressure using a randomized 3-period (7 d each) crossover design. Study 2: The effects of 1250 mL/d of black tea were compared with hot water in 22 subjects with mildly raised serum total cholesterol concentrations using a randomized 2-period (4 wk each) crossover design. F(2)-isoprostane excretion was not altered after regular ingestion of green tea (273 +/- 48 pmol/mmol creatinine) or black tea (274 +/- 39 pmol/mmol creatinine) in comparison with hot water (263 +/- 47 pmol/mmol creatinine; Study 1), or by regular ingestion of black tea (334 +/- 71 pmol/mmol creatinine) in comparison with hot water (355 +/- 75 pmol/mmol creatinine; Study 2). These results do not support the suggestion that polyphenolic antioxidants derived from tea inhibit in vivo lipid peroxidation. 相似文献
84.
85.
86.
87.
Self-expanding endovascular graft: an experimental study in dogs 总被引:2,自引:0,他引:2
T Yoshioka K C Wright S Wallace D D Lawrence C Gianturco 《AJR. American journal of roentgenology》1988,151(4):673-676
An arterial endovascular graft was constructed by wrapping an expandable nylon mesh around a framework of Gianturco self-expanding metallic stents. The devices were passed through a 12-French Teflon catheter and positioned in the normal abdominal aorta of five dogs, two of which also had a device placed in an external iliac artery. At follow-up (1-6 months), all grafts remained patent, even though slight luminal narrowing due to neointimal encasement was noted. Histologically, all grafts were covered by neointimal proliferation at the time of removal. The graft material expanded with the stents, resulting in a tight fit between the graft and the vessel wall. Side branches narrowed but remained open because of the size of the nylon mesh. No migration of the grafts equipped with a barbed lead stent was noted. Expandable nylon mesh can be used as an endovascular graft material when wrapped around a framework of self-expanding stents. The resulting device can be easily delivered via transcatheter techniques, and once placed in a vessel, the nylon acts as a support for neointimal encasement, which forms a new vascular lumen. 相似文献
88.
89.
90.
Attitudes to childhood in general and towards one's own childhood in particular are compared in a survey of 152 Australian and New Zealand child psychiatric and paediatric trainees. Results confirm the findings of Enzer et al that paediatricians view childhood more positively than do child psychiatrists. Although there is a significant difference between the two groups on measures of their perceptions of the parenting they received with child psychiatrists rating their own parents as less caring than do paediatricians, there is no relationship between attitudes to childhood and perceptions of the parenting they received. Implications of these findings are examined, both in terms of motivation for choosing one or other specialty and for the working relationship between the two professions. 相似文献