全文获取类型
收费全文 | 3207篇 |
免费 | 213篇 |
国内免费 | 19篇 |
专业分类
耳鼻咽喉 | 20篇 |
儿科学 | 117篇 |
妇产科学 | 59篇 |
基础医学 | 343篇 |
口腔科学 | 9篇 |
临床医学 | 434篇 |
内科学 | 552篇 |
皮肤病学 | 14篇 |
神经病学 | 314篇 |
特种医学 | 30篇 |
外科学 | 329篇 |
综合类 | 336篇 |
一般理论 | 4篇 |
预防医学 | 439篇 |
眼科学 | 50篇 |
药学 | 176篇 |
中国医学 | 1篇 |
肿瘤学 | 212篇 |
出版年
2023年 | 24篇 |
2022年 | 38篇 |
2021年 | 87篇 |
2020年 | 60篇 |
2019年 | 99篇 |
2018年 | 109篇 |
2017年 | 68篇 |
2016年 | 98篇 |
2015年 | 74篇 |
2014年 | 97篇 |
2013年 | 145篇 |
2012年 | 282篇 |
2011年 | 310篇 |
2010年 | 143篇 |
2009年 | 112篇 |
2008年 | 216篇 |
2007年 | 250篇 |
2006年 | 245篇 |
2005年 | 222篇 |
2004年 | 131篇 |
2003年 | 130篇 |
2002年 | 135篇 |
2001年 | 21篇 |
2000年 | 17篇 |
1999年 | 14篇 |
1998年 | 26篇 |
1997年 | 11篇 |
1996年 | 12篇 |
1995年 | 15篇 |
1994年 | 15篇 |
1993年 | 13篇 |
1992年 | 16篇 |
1991年 | 22篇 |
1990年 | 18篇 |
1989年 | 8篇 |
1988年 | 8篇 |
1987年 | 13篇 |
1986年 | 10篇 |
1985年 | 7篇 |
1984年 | 10篇 |
1983年 | 8篇 |
1982年 | 9篇 |
1981年 | 11篇 |
1980年 | 8篇 |
1977年 | 6篇 |
1974年 | 8篇 |
1973年 | 7篇 |
1972年 | 8篇 |
1971年 | 7篇 |
1966年 | 5篇 |
排序方式: 共有3439条查询结果,搜索用时 0 毫秒
1.
2.
O’Beirne Sarah L. Chazen J. Levi Cornman-Homonoff Joshua Carey Bridget T. Gelbman Brian D. 《Lung》2019,197(6):727-733
Lung - Diaphragmatic paralysis (DP) is an important cause of dyspnea with many underlying etiologies; however, frequently no cause is identified despite extensive investigation. We hypothesized... 相似文献
3.
4.
Bridget A. Bagert 《Current neurology and neuroscience reports》2009,9(5):405-410
Recent seroepidemiologic and pathologic evidence suggests that prior infection with Epstein-Barr virus (EBV) may be necessary
for the development of multiple sclerosis (MS). EBV infects more than 90% of all humans, most of whom remain healthy. In contrast,
99% of MS patients have evidence of prior infection with EBV. EBV infects resting B lymphocytes, immortalizing them into long-lived
memory B cells that survive largely undetected by the immune system in the peripheral circulation. MS patients show elevated
titers to EBV years before developing any neurologic symptoms. Postmortem pathologic analysis of brains of patients with MS
has revealed diffuse EBV-associated B-cell dysregulation in all forms of MS. Theories of pathogenesis of EBV in MS include
antigenic mimicry, immortalization of B-cell clones, and cytotoxic T-cell dysfunction against virally infected B cells. This
article reviews the existing evidence of the relationship between EBV and MS and considers the therapeutic implication of
this evidence. 相似文献
5.
6.
7.
8.
Michelle M. Macias Conway F. Saylor Kathie B. Haire Nancy L. Bell 《Children's Health Care》2007,36(2):99-115
This study examined the types of stress experienced by maternal and paternal caretakers of children with Neural Tube Defects (NTD) and examined child and family characteristics that correlated with stress. Participants were 71 two-parent families of a child with spina bifida. Parents completed the Parenting Stress Index-Short Form to measure types of stress. Additional measures were completed to investigate variables potentially related to reported stress. Fathers reported significantly higher levels of stress from “dysfunctional parent-child interaction.” Mothers' personal stress correlated with disability and medical characteristics of the child. Fathers reported more stress when the child had maladaptive behaviors and when experiencing fewer social supports and resources. Mothers and fathers coparenting a child with NTD have both common and unique stresses. It is important that both be included in parent support and education initiatives. 相似文献
9.
M G Conlan W D Haire R P Lieberman G Lund A Kessinger J O Armitage 《Bone marrow transplantation》1991,7(3):235-240
Long-term indwelling central venous catheters have eased the administration of drugs, blood products, and hyperalimentation to patients with cancer. However, their use is associated with thrombotic complications. We report here on the thrombotic complications prospectively observed in 46 patients with refractory lymphoma (22 Hodgkin's disease, 24 non-Hodgkin's lymphoma) who had placement of one or more catheters in preparation for autologous stem cell transplantation (ASCT). Thrombosis of 26 catheters in 19 patients was observed. Specific abnormalities of hemostasis were equally common in patients who developed thrombosis and in those who did not. Thrombotic complications were more common in patients with Hodgkin's disease (13/22) than in patients with non-Hodgkin's lymphoma (6/24, p = 0.04). Although more patients with Hodgkin's disease had received prior splenectomy and/or irradiation to the area involved by thrombosis than patients with non-Hodgkin's lymphoma, the incidence of splenectomy and irradiation was similar for patients with Hodgkin's disease who developed thrombosis and those who did not. Therefore, although the etiology remains unexplained, patients with Hodgkin's disease undergoing intensive chemotherapy and ASCT appear to have a higher incidence of catheter-related thrombosis than patients with non-Hodgkin's lymphoma undergoing similar therapy. 相似文献
10.
W D Haire R P Lieberman G B Lund J A Edney A Kessinger J O Armitage 《Bone marrow transplantation》1991,7(1):57-59
Thrombosis is common after placement of silicone rubber subclavian vein catheters in patients with malignancy receiving conventional doses of chemotherapy. To determine the incidence of this complication in marrow transplant patients and the effect of different catheter designs on thrombosis rates, patients were randomized to receive either open-ended Hickman catheters or valve-ended Groshong catheters for venous access during the transplantation procedure. A total of 35 catheters were placed, of which 23 were double-lumen (11 Groshong and 12 Hickman) and 12 were single-lumen (six Groshong and six Hickman). Arm venograms were performed on all patients at the time of hematopoietic recovery or occurrence of symptoms of subclavian vein thrombosis. There were 10 cases of total subclavian vein thrombosis (three were symptomatic) and 12 cases of asymptomatic non-occlusive mural thrombi. Only 13 normal veins were found. There was no difference in thrombosis rate between the Hickman and Groshong catheters. Double lumen catheters tended to be more likely to cause total venous occlusion (nine of 23) than single lumen catheters (one of 12) (p = 0.06, Fisher's exact test). We conclude that subclavian vein thrombosis is a common occurrence after placement of silicone rubber catheters for venous access during marrow transplantation. Most cases are asymptomatic. Groshong catheters are just as likely to cause this complication as Hickman catheters. 相似文献