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   2470篇
  免费   185篇
  国内免费   18篇
耳鼻咽喉   23篇
儿科学   61篇
妇产科学   87篇
基础医学   392篇
口腔科学   63篇
临床医学   293篇
内科学   531篇
皮肤病学   87篇
神经病学   230篇
特种医学   55篇
外科学   211篇
综合类   6篇
一般理论   2篇
预防医学   221篇
眼科学   10篇
药学   148篇
中国医学   2篇
肿瘤学   251篇
  2024年   4篇
  2023年   37篇
  2022年   58篇
  2021年   107篇
  2020年   71篇
  2019年   84篇
  2018年   112篇
  2017年   88篇
  2016年   94篇
  2015年   95篇
  2014年   110篇
  2013年   152篇
  2012年   199篇
  2011年   185篇
  2010年   112篇
  2009年   101篇
  2008年   141篇
  2007年   160篇
  2006年   139篇
  2005年   146篇
  2004年   123篇
  2003年   99篇
  2002年   68篇
  2001年   22篇
  2000年   13篇
  1999年   13篇
  1998年   23篇
  1997年   18篇
  1996年   8篇
  1995年   17篇
  1994年   22篇
  1993年   7篇
  1992年   5篇
  1991年   4篇
  1990年   5篇
  1989年   1篇
  1988年   3篇
  1987年   1篇
  1986年   3篇
  1985年   5篇
  1984年   6篇
  1983年   1篇
  1982年   2篇
  1981年   2篇
  1980年   1篇
  1977年   1篇
  1976年   1篇
  1975年   1篇
  1974年   2篇
  1967年   1篇
排序方式: 共有2673条查询结果,搜索用时 250 毫秒
991.
AIM: To describe the psychosocial situation of children/adolescents with heart disease and their families, an inventory method was worked out. METHODS: Ninety-seven children/adolescents with congenital heart disease (CHD) were graded into three categories with respect to complexity of CHD. Group I included 42 patients with malformations requiring standardized operations. Group II included 20 patients with more complicated malformations, and group III included 35 patients with very complex malformations. The patients were compared with controls without heart disease, matched for age and gender. The psychosocial impact of CHD was measured by the inventory. RESULTS: The most frequent problems in the patient group were healthcare and treatment-related needs (71/97) in the external sphere, family symptoms (68/97) in the interpersonal sphere, and somatic symptoms (19/97) in the personal sphere. Corresponding numbers in the controls were treatment-related needs (15/97), family (9/97) and somatic symptoms (25/97). Fifty per cent of the symptoms in the patient groups were mild, 30% moderate and 20% severe. The most severe symptoms were found in the interpersonal sphere, where family symptoms constituted the most severe variable. The frequency of severe problems in the personal sphere was 11% in the patients and 1% in the controls. This inventory method differentiates the grades of medical complexity both regarding number and severity of psychosocial symptoms. It indicates severe personal problems in the most complex group and shows that they have severe personal problems independent of family problems. CONCLUSION: This study elucidates the psychosocial complexity in children/adolescents with CHD, which has clinical implications in developing a psychosocial care programme.  相似文献   
992.
Hereditary non-polyposis colorectal cancer (HNPCC) is an autosomal dominantly inherited syndrome which confers an increased risk for colorectal cancer and endometrial cancer as well as other tumors. It is caused by germline DNA mismatch repair (MMR) gene mutations in five MMR genes, hMSH2, hMLH1, hPMS1, hPMS2 and hMSH6. Finding mutations in these high risk families means that you can offer presymptomatic carrier diagnosis and thereby identify individuals with a very high risk for cancer. These persons benefit from counseling and should be offered surveillance. We have used DGGE to screen members from 34 families for mutations in hMLHl and hMSH2. Six mutations in five families were found, five of these mutations are new. Besides, three new polymorphisms were identified. The mutations were found in two of seven Amsterdam criteria HNPCC families and in three of four families with at least one case of early onset of CRC (before 35), suggesting there are apporopriate families to be chosen for mutation screening in MMR genes.  相似文献   
993.
The NADPH oxidase 2 (NOX2) complex is responsible for the production of ROS in phagocytic cells. Genetic defects in NOX2 lead to opportunistic infections and inflammatory manifestations such as granulomas in humans, also known as chronic granulomatous disease (CGD). This condition is mirrored in mice with defective ROS production and interestingly both species are predisposed to autoimmune diseases. An unresolved question is whether the hyper‐inflammation and tendency to develop autoimmunity are secondary to the increased infections, or whether these are parallel phenomena. We generated germ‐free ROS deficient Ncf1 mutant mice that when reared in specific pathogen‐free condition, are highly susceptible to collagen‐induced arthritis compared with wild‐type mice. Strikingly, arthritis incidence and severity was almost identical in germ‐free and specific pathogen‐free ROS‐deficient mice. In addition, partial reduction of the microbial flora by antibiotics treatment did not alter the disease course. Taken together, this shows that ROS has a clear immune regulatory function that is decoupled from its function in host defence.  相似文献   
994.
995.
The objective of the study is to examine the comparative responsiveness of outcome measures to assess progression over time in Parkinson's disease (PD). One hundred twenty‐eight patients participating in a clinic‐based naturalistic study of PD were assessed with the Hoehn and Yahr, UPDRS, MMSE, PDQ‐39, PDQL, EQ‐5D, and BDI scales at baseline and at 1 year. In addition, 82 patients in a community‐based study of patients with PD who had completed self‐rated Schwab and England, PDQ‐39, EQ‐5D, and BDI scales at baseline, were sent the same questionnaires at 1 and 4 years. Responsiveness was assessed using t‐tests, standardised effect size, and standardised response mean. In both samples, the Hr‐QoL measures were less responsive to change over time than the impairment and disability scales (Hoehn and Yahr, UPDRS, Schwab and England scales). In addition, in the clinic‐based sample, Hoehn and Yahr and UPDRS ADL scale (“on”) were more responsive to progression over time than UPDRS motor part and ADL part (“off”). Hr‐QoL measures are less responsive to change over time than measures of impairment and disability. Although this suggests that these measures are less accurate in detecting subtle changes, it may also indicate that the multifactorial subjective assessment of Hr‐QoL adapts to changes over time. Global assessment of overall impairment and disability (which incorporates motor and nonmotor features of PD), however, appeared relatively responsive to change over time in patients in a naturalistic setting. © 2009 Movement Disorder Society  相似文献   
996.
In this qualitative study, women's perceptions and experiences of the quality of family planning services at public primary health centres were explored in the city of Tabriz, Iran. Nine focus group discussions were carried out with a total of 53 married women of reproductive age. The public services were appreciated for being accessible and affordable, but important shortcomings were identified. The need for improved privacy, a wider choice of contraceptive methods and accurate and more comprehensive information about methods and side effects were stressed. The issue of marital counselling was raised as an important unmet need, especially in one discussion group. The women's sense of having the right to make autonomous, informed choices and to be treated with dignity and respect emerged as the main theme. A second, cross-cutting theme was their wish for their husbands to be more strongly involved in family planning and marital counselling and education. Women's experiences and suggestions for improvements in service delivery should be considered in future plans. Multifaceted interventions are needed to narrow the existing gap between women's needs and rights and the actual quality of services.  相似文献   
997.
Several studies have evaluated music interventions prior and after coronary angiography and percutaneous coronary intervention (PCI), but there is no clear evidence showing that music has an effect on patients during these procedures. The purpose was to investigate the effects of music on anxiety, angina, pain, relaxation, and comfort in patients during angiographic procedures and to evaluate gender differences. The study was a four-armed, prospective randomized controlled trial included 240 patients undergoing coronary angiography and/or PCI. Patients were allocated to receive relaxing music, MusiCure® or standard care during the procedure. Outcome measures were; puncture pain and the discomfort related to it, angina and the discomfort related to it, anxiety, experience of the sound environment, discomfort of lying still, and the doses of anxiolytics and analgesics during the procedure. No differences were found between the music and control groups regarding any of the trial endpoints or gender-related differences. The overall rating of the sound environment and feeling of relaxation was high. In conclusion, music intervention in patients undergoing angiographic procedures was highly feasible, but not effective in this study though the delivery of music went smoothly and did not disturb the examination and patients and staff alike looked favorably on it.  相似文献   
998.
999.
1000.
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