全文获取类型
收费全文 | 36248篇 |
免费 | 3030篇 |
国内免费 | 65篇 |
专业分类
耳鼻咽喉 | 413篇 |
儿科学 | 1160篇 |
妇产科学 | 891篇 |
基础医学 | 4686篇 |
口腔科学 | 543篇 |
临床医学 | 4596篇 |
内科学 | 6851篇 |
皮肤病学 | 525篇 |
神经病学 | 3304篇 |
特种医学 | 1206篇 |
外国民族医学 | 8篇 |
外科学 | 4358篇 |
综合类 | 604篇 |
一般理论 | 23篇 |
预防医学 | 4208篇 |
眼科学 | 863篇 |
药学 | 2664篇 |
中国医学 | 26篇 |
肿瘤学 | 2414篇 |
出版年
2023年 | 335篇 |
2022年 | 560篇 |
2021年 | 1142篇 |
2020年 | 648篇 |
2019年 | 1077篇 |
2018年 | 1179篇 |
2017年 | 805篇 |
2016年 | 930篇 |
2015年 | 994篇 |
2014年 | 1333篇 |
2013年 | 1641篇 |
2012年 | 2462篇 |
2011年 | 2516篇 |
2010年 | 1292篇 |
2009年 | 1094篇 |
2008年 | 1866篇 |
2007年 | 1940篇 |
2006年 | 1852篇 |
2005年 | 1711篇 |
2004年 | 1621篇 |
2003年 | 1361篇 |
2002年 | 1255篇 |
2001年 | 629篇 |
2000年 | 660篇 |
1999年 | 584篇 |
1998年 | 341篇 |
1997年 | 276篇 |
1996年 | 255篇 |
1995年 | 237篇 |
1994年 | 212篇 |
1993年 | 189篇 |
1992年 | 432篇 |
1991年 | 433篇 |
1990年 | 389篇 |
1989年 | 410篇 |
1988年 | 361篇 |
1987年 | 340篇 |
1986年 | 338篇 |
1985年 | 323篇 |
1984年 | 271篇 |
1983年 | 232篇 |
1982年 | 158篇 |
1981年 | 126篇 |
1979年 | 195篇 |
1978年 | 172篇 |
1977年 | 146篇 |
1976年 | 141篇 |
1974年 | 162篇 |
1973年 | 147篇 |
1972年 | 132篇 |
排序方式: 共有10000条查询结果,搜索用时 7 毫秒
71.
Lee S. Clay Karen Criss Unjeria C. Jackson 《Journal of Midwifery & Women's Health》1993,38(Z1):72s-79s
External cephalic version has been used periodically for centuries to manage breech presentations. As cesarean section rates have escalated in the last two decades, ways to curb this rise have been evaluated. By reducing the number of infants that arrive in labor in a representation, it is possible to impact the overall cesarean section rate. External cephalic version is a safe, effective method when used in appropriate cases of breech presentation. A forward or backward roll can be accomplished in women at term with singleton gestations, adequate amniotic fluid, and reactive nonstress tests. Parity, fetal and placental position, and descent of the presenting part may all influence the success rate of the version. 相似文献
72.
73.
A 32–year–old man had an unusual gunshot wound to the leg, causing a peroneal nerve palsy. Sonography provided useful complementary findings to the electrodiagnostic localization of the injury. 相似文献
74.
75.
J F Cockburn C A Eynon N Virji J E Jackson 《AJR. American journal of roentgenology》1992,159(1):121-124
During a 9-month period, 69 Hickman catheters were successfully inserted by using angiographic techniques in 59 patients with hematologic disorders. A pneumothorax, which did not require drainage, developed in one patient. No other significant complications occurred at the time of insertion. Eighteen catheters were removed electively, 15 are still in situ, six were removed for thrombosis, and five were accidentally removed. Infection precipitated removal in six subjects. Ten patients died with the catheter in place. Five catheters were removed in patients with refractory septicemia of unknown origin. One catheter burst during an injection and had to be removed. Three patients were lost to follow-up. There were 3.24 infectious episodes per 1000 days of catheterization, more than twice the rate found in some other series. The results of this study are compatible with the growing body of evidence in favor of the angiographic insertion of Hickman catheters. The apparently high rate of infection is ascribed to factors other than insertion in the angiography suite, including the high proportion of bone marrow transplantation patients. 相似文献
76.
The yeast spectrum of the 'tea fungus Kombucha' 总被引:1,自引:0,他引:1
77.
Annette Jackson Cynthia McSherry Kim Butters Michael Diko P.Stephen Almond Arthur J Matas Nancy L Reinsmoen 《Human immunology》1997,55(2):148-153
Our previous studies have shown that the in vitro assay of donor antigen-specific hyporeactivity is a useful marker for identifying solid organ transplant recipients (kidney, lung and heart) at low risk for immunologic complications (i.e., late acute rejection episodes and chronic rejection). Donor antigen-specific hyporeactivity is defined as a significantly decreased post- vs. pretransplant proliferative response to donor antigens while response to third-party controls remains unchanged. We analyzed whether exposure to the same HLA-DR antigen pretransplant via random blood transfusion and posttransplant via the transplanted organ influenced the development of hyporeactivity. Thirty previously nontransfused recipients, each receiving two 150 ml pretransplant random blood transfusions, were assessed for hyporeactivity at 1 year posttransplant. Of the 12 recipients with pretransplant exposure to kidney HLA-DR via transfusions, 6 (50%) developed hyporesponsiveness; in contrast, of the 18 recipients who were not preexposed, only 3 (15%) exhibited this form of immunomodulation. Of interest, 2 of the 3 hyporesponsive recipients who were not preexposed, received units containing HLA-DR antigens previously shown to share crossreactive epitopes with the kidney HLA-DR. In conclusion, these results suggest a increased incidence in the development of hyporeactivity in patients receiving pretransplant transfusions which share an HLA-DR antigen with the transplanted kidney. 相似文献
78.
Addiction was written by David Marteau, a nurse and former headof treatment at Clouds House. It is a short book offering comprehensivecoverage of the causes, nature and treatment of 相似文献
79.
80.