首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   80439篇
  免费   6065篇
  国内免费   256篇
耳鼻咽喉   915篇
儿科学   2100篇
妇产科学   1127篇
基础医学   10901篇
口腔科学   848篇
临床医学   8535篇
内科学   17255篇
皮肤病学   904篇
神经病学   7857篇
特种医学   3100篇
外国民族医学   1篇
外科学   12969篇
综合类   945篇
一般理论   94篇
预防医学   6042篇
眼科学   1973篇
药学   5426篇
中国医学   96篇
肿瘤学   5672篇
  2024年   57篇
  2023年   672篇
  2022年   1044篇
  2021年   2425篇
  2020年   1375篇
  2019年   2230篇
  2018年   2541篇
  2017年   1828篇
  2016年   1922篇
  2015年   2229篇
  2014年   3234篇
  2013年   4099篇
  2012年   6561篇
  2011年   6797篇
  2010年   3727篇
  2009年   3276篇
  2008年   5463篇
  2007年   5651篇
  2006年   5229篇
  2005年   5176篇
  2004年   4681篇
  2003年   4288篇
  2002年   3887篇
  2001年   621篇
  2000年   433篇
  1999年   609篇
  1998年   799篇
  1997年   601篇
  1996年   494篇
  1995年   440篇
  1994年   411篇
  1993年   404篇
  1992年   275篇
  1991年   220篇
  1990年   195篇
  1989年   184篇
  1988年   170篇
  1987年   146篇
  1986年   143篇
  1985年   159篇
  1984年   193篇
  1983年   161篇
  1982年   239篇
  1981年   236篇
  1980年   173篇
  1979年   99篇
  1978年   116篇
  1977年   104篇
  1976年   73篇
  1975年   65篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
Heart Failure Reviews - The nitric oxide (NO)–guanylate cyclase (GC)–cyclic guanosine monophosphate (cGMP) pathway plays an important role in cardiovascular, pulmonary and renal...  相似文献   
4.
5.
6.
Arthroscopic acromioclavicular joint excision is a commonly performed but technically demanding procedure. Incomplete excision can leave residual symptoms. We present a simple, reproducible technique ensuring satisfactory excision of the joint.  相似文献   
7.
Coronavirus disease 2019 (COVID-19) has resulted in many challenges in patient care, especially among high-risk populations such as heart transplant recipients. Patients with heart transplant experience a significantly higher mortality rate with COVID-19 infection, and management is based on extrapolation from clinical trials done on nontransplant patients and from clinical experience. Here we report 4 cases of patients with heart transplant who presented with COVID-19 infection in late 2020. Patients presented with symptoms similar to those seen in the general population. All 4 patients were admitted to the hospital, and they were all treated with dexamethasone. In addition, 2 patients received remdesivir. Immunosuppressive medications were adjusted to maintain adequate levels of immunosuppression but at the same time allow for an adequate immune response against the infection. All patients were discharged alive from the hospital. We then performed a literature review on studies that included heart transplant patients who developed the infection and developed suggestions for a standardized management approach, which we share in this article.  相似文献   
8.
9.

Background Context

Low back pain (LBP) is a common complaint in clinical practice of multifactorial origin. Although obesity has been thought to contribute to LBP primarily by altering the distribution of mechanical loads on the spine, the additional contribution of obesity-related conditions such as diabetes mellitus (DM) to LBP has not been thoroughly examined.

Purpose

To determine if there is a relationship between DM and LBP that is independent of body mass index (BMI) in a large cohort of adult survey participants.

Study Design

Retrospective analysis of prospectively collected National Health and Nutrition Examination Survey (NHANES) data to characterize associations between LBP, DM, and BMI in adults subdivided into 6 subpopulations: normal weight (BMI 18.5–25), overweight (BMI 25–30), and obese (BMI >30) diabetics and nondiabetics. Diabetes was defined with glycohemoglobin A1c (HbA1c) 6.5%.

Patient Sample

11,756 participants from NHANES cohort.

Outcome Measures

Percentage of LBP reported.

Methods

LBP reported in the 1999-2004 miscellaneous pain NHANES questionnaire was the dependent variable examined. Covariates included HbA1c, BMI, age, and family income ratio to poverty as continuous variables as well as race, gender, and smoking as binary variables. Individuals were further subdivided by weight class and diabetes status. Regression and graphical analyses were performed on the study population as a whole and also on subpopulations.

Results

Increasing HbA1c did not increase the odds of reporting LBP in the full cohort. However, multivariate logistic regression of the 6 subpopulations revealed that the odds of LBP significantly increased with increasing HbA1c levels in normal weight diabetics. No other subpopulations reported significant relationships between LBP and HbA1c. LBP was also significantly associated with BMI for normal weight diabetics and also for obese subjects regardless of their DM status.

Conclusions

LBP is significantly related to DM status, but this relationship is complex and may interact with BMI. These results support the concept that LBP may be improved in normal weight diabetic subjects with improved glycemic control and weight loss, and that all obese LBP subjects may benefit from improved weight loss alone.  相似文献   
10.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号