全文获取类型
收费全文 | 58311篇 |
免费 | 4928篇 |
国内免费 | 195篇 |
专业分类
耳鼻咽喉 | 439篇 |
儿科学 | 1782篇 |
妇产科学 | 1538篇 |
基础医学 | 7576篇 |
口腔科学 | 1194篇 |
临床医学 | 6097篇 |
内科学 | 13019篇 |
皮肤病学 | 865篇 |
神经病学 | 5504篇 |
特种医学 | 1888篇 |
外国民族医学 | 1篇 |
外科学 | 7793篇 |
综合类 | 969篇 |
一般理论 | 64篇 |
预防医学 | 5299篇 |
眼科学 | 1080篇 |
药学 | 4556篇 |
1篇 | |
中国医学 | 65篇 |
肿瘤学 | 3704篇 |
出版年
2023年 | 323篇 |
2022年 | 475篇 |
2021年 | 991篇 |
2020年 | 658篇 |
2019年 | 1021篇 |
2018年 | 1160篇 |
2017年 | 896篇 |
2016年 | 965篇 |
2015年 | 1133篇 |
2014年 | 1623篇 |
2013年 | 2235篇 |
2012年 | 3341篇 |
2011年 | 3659篇 |
2010年 | 2001篇 |
2009年 | 1849篇 |
2008年 | 3109篇 |
2007年 | 3560篇 |
2006年 | 3337篇 |
2005年 | 3427篇 |
2004年 | 3162篇 |
2003年 | 2991篇 |
2002年 | 2803篇 |
2001年 | 1065篇 |
2000年 | 1058篇 |
1999年 | 1050篇 |
1998年 | 700篇 |
1997年 | 556篇 |
1996年 | 553篇 |
1995年 | 512篇 |
1994年 | 452篇 |
1993年 | 471篇 |
1992年 | 751篇 |
1991年 | 760篇 |
1990年 | 700篇 |
1989年 | 674篇 |
1988年 | 644篇 |
1987年 | 639篇 |
1986年 | 557篇 |
1985年 | 585篇 |
1984年 | 600篇 |
1983年 | 494篇 |
1982年 | 466篇 |
1981年 | 432篇 |
1980年 | 405篇 |
1979年 | 398篇 |
1978年 | 408篇 |
1977年 | 323篇 |
1976年 | 314篇 |
1974年 | 300篇 |
1972年 | 270篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Michael L. Goodman Miriam S. Mutambudzi Stanley Gitari Philip H. Keiser Sarah E. Seidel 《Vulnerable children and youth studies》2016,11(4):366-378
There are an estimated 56 million orphans and vulnerable children across sub-Saharan Africa. Communities typically care for orphan children through informal caring arrangements – either within or outside of kinship networks. Within Kenya, an estimated 250,000 children live on the streets. There is less research related to fostering attitudes of this special population than orphans and vulnerable children generally. Important research over the past decade has illuminated multiple ways in which children are made more vulnerable because of HIV, including parental death and street-migration from HIV-affected households. As HIV transitions from a terminal illness to a chronic, manageable one, research is also required to establish how parents living with HIV can be an asset to children. In this study, we assess whether mothers living with HIV were very willing to foster biologically-related children, and street-involved children, how these fostering attitudes differed from mothers not living with HIV, and whether differences in fostering attitudes by reported HIV status were mediated by social support, family functioning and general self-rated health. Approximately 40% of mothers living with HIV were very willing to provide long-term foster care to biologically-related or street-involved children. This was less than the percentage of mothers not living with HIV, who were very willing to foster biologically-related children (61%) or street-involved children (58%). Significant portions of these differences were explained by social support, family functioning and general self-rated health. Multi-sectoral approaches are suggested by these findings in order to improve the child-fostering capacity of mothers living with HIV. Improving social support, family functioning and general self-rated health among HIV-infected mothers may not only provide protective benefits for the mothers and their children, but also expand the community’s capacity to care for orphan and vulnerable children. 相似文献
3.
4.
5.
6.
7.
8.
Philip A. Rozario Nancy L. Morrow-Howell Enola K. Proctor 《Quality of life research》2006,15(4):755-759
Using the SF-12 to measure physical and mental functioning, the authors examine the intra-individual changes in health-related
quality of life (HRQOL) 6 months post-discharge for depressed older adults. In addition, they examine three sets of predictors
that might influence these changes. The sample of depressed older adults was recruited from an inpatient geropsychiatry unit.
Although their physical and mental health scores on the SF-12 were lower than comparable norms, the sample showed an average
increase in their mental functioning but a decrease in the physical functioning over the 6 months. Negative life-events were
significant predictors of people who reported no change in their mental health functioning and decreases in their physical
health functioning. Interestingly, those who experienced positive life events were more likely to report declines and younger
participants were more likely to report no change in their physical functioning. The findings indicate that the effects of
depression on HRQOL can have enduring effects on a sample of previously hospitalized older adults. The significance of life
event changes might signify the importance of taking into account non-traditional areas of medical interventions. Further,
the findings indicate the usefulness of the SF-12 quantifying HRQOL outcomes. 相似文献
9.
10.
BACKGROUND: The 1997 National Asthma Education and Prevention Program (NAEPP) recommends a severity classification scheme to optimize the use of anti-inflammatory therapy for persistent asthma. Physician documentation of asthma severity is often used as a quality assurance measure. OBJECTIVE: To test the hypothesis that physician documentation of asthma severity is associated with appropriate use of anti-inflammatory therapy. DESIGN/METHODS: Setting: inner-city academic health center. First, we reviewed a consecutive sample of charts of scheduled pediatric patients. Then, we administered a structured parent survey regarding the child's asthma symptoms and current asthma therapy. We used NAEPP guidelines to classify patients' severity of asthma. The main outcome measure was appropriate use of anti-inflammatory therapy. Appropriate therapy was defined as: (1) mild persistent asthmatics using anti-inflammatory therapy, and (2) moderate-severe persistent asthmatics using inhaled steroids. Chart classification of asthma severity was compared with the NAEPP-applied classification. RESULTS: Of 784 charts, 214 (27%) were asthmatic. Of these, 176 (82%) were surveyed. The mean age was 7.4 years; 61% were males. Severity classification was documented in 77% of charts. Chart documentation differed significantly from survey classification for the same patients: (mild intermittent 54% vs. 40%, mild persistent 21% vs. 14%, moderate persistent 24% vs. 36%, severe persistent 1% vs. 10%; all p < .001). Correctly classified patients were more likely to be on appropriate therapy. CONCLUSIONS: Physicians underestimated the severity classification of asthmatic patients. Incorrect classification was associated with inappropriate asthma therapy. These findings have implications for the institution of asthma quality improvement programs. 相似文献