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   950篇
  免费   75篇
  国内免费   7篇
耳鼻咽喉   3篇
儿科学   31篇
妇产科学   2篇
基础医学   61篇
口腔科学   16篇
临床医学   101篇
内科学   197篇
皮肤病学   6篇
神经病学   98篇
特种医学   103篇
外科学   206篇
综合类   39篇
预防医学   72篇
眼科学   3篇
药学   68篇
中国医学   2篇
肿瘤学   24篇
  2023年   10篇
  2021年   10篇
  2020年   13篇
  2019年   13篇
  2018年   19篇
  2017年   10篇
  2016年   22篇
  2015年   20篇
  2014年   30篇
  2013年   28篇
  2012年   48篇
  2011年   38篇
  2010年   39篇
  2009年   36篇
  2008年   57篇
  2007年   52篇
  2006年   53篇
  2005年   48篇
  2004年   35篇
  2003年   28篇
  2002年   31篇
  2001年   39篇
  2000年   37篇
  1999年   24篇
  1998年   26篇
  1997年   10篇
  1996年   13篇
  1995年   20篇
  1994年   10篇
  1993年   12篇
  1992年   22篇
  1991年   15篇
  1990年   14篇
  1989年   17篇
  1988年   16篇
  1987年   12篇
  1986年   10篇
  1985年   9篇
  1984年   11篇
  1983年   5篇
  1981年   5篇
  1979年   4篇
  1978年   5篇
  1977年   5篇
  1976年   5篇
  1974年   4篇
  1973年   4篇
  1970年   4篇
  1969年   4篇
  1968年   6篇
排序方式: 共有1032条查询结果,搜索用时 687 毫秒
1.
2.
3.
Background Out of area placements for people with challenging behaviour represent an expensive and often ineffective strategy for meeting the needs of this service user group. Methods More than 800 agencies and service settings in a large area of South Wales were screened to identify children and adults with challenging behaviour against a number of defined operational criteria. Detailed data on identified individuals and the services they received were collected by interviewing key informants. Univariate and multivariate statistics were employed to identify predictors of out of area placement. Results In total, 1458 people were identified. Full data were available for 901 participants, 97 of whom were placed out of area. Predictors of out of area placement included behaviours resulting in physical injury and exclusion from service settings, a history of formal detention under the mental health act, the presence of mental health problems, a diagnosis of autism and higher total score on the Adaptive Behaviour Scale. Out of area placements were typically of high cost, and associated with only limited evidence of improved service quality. Conclusions Identifying predictors for out of area placement can be used to highlight deficiencies in local services and individuals at increased risk of exclusion from local services.  相似文献   
4.
Respiratory muscle function in cystic fibrosis.   总被引:1,自引:0,他引:1       下载免费PDF全文
A Mier  A Redington  C Brophy  M Hodson    M Green 《Thorax》1990,45(10):750-752
Maximal static expiratory and inspiratory mouth pressures (PEmax and PImax) and quadriceps femoris muscle strength were measured in 25 patients aged 16-28 years with cystic fibrosis (mean FEV1 46% predicted). Mean (SD) PEmax was 64% (18%) predicted (below 75% predicted in 16 of the 25 patients), and PImax was 64% (24%) predicted (below 75% predicted in 14 patients). Quadriceps muscle strength was 68% (20%) predicted (below 75% predicted in 17 patients). The relatively small reduction in respiratory muscle strength in these patients was unlikely to have contributed appreciably to their respiratory problems.  相似文献   
5.
The dollars and sense of drug-eluting stents   总被引:1,自引:1,他引:0       下载免费PDF全文
  相似文献   
6.
OBJECTIVE: To assess mortality rates from congestive heart failure in Canada from 1970 to 1989. DESIGN: Observational, retrospective design using national population and mortality data. MAIN RESULTS: There is a definite age gradient for deaths from congestive heart failure which, combined with a general ageing of the Canadian population, has lead to an increase in the absolute number of deaths. However, Standardized Mortality Ratios, which account for shifting population distributions, have shown steadily decreasing values for both men and women since 1980. CONCLUSIONS: Recent improvements in cardiology care demonstrated in controlled clinical trials appear also to be present in epidemiological studies.  相似文献   
7.
PURPOSE: Hemolysis during extracorporeal membrane oxygenation (ECMO) may be associated with the development of hemoglobinuria (Hb) nephropathy and acute renal failure. For patients requiring ECMO, continuous renal replacement therapy (CRRT) can be simultaneously performed by attaching a hemofilter to the ECMO circuit, thereby shunting part of the ECMO blood flow through the hemofilter. However, the possibility that CRRT may further enhance hemolysis (and the risk of Hb nephropathy) in patients on ECMO has not been previously investigated. METHODS: Medical records of 42 children (1 day-12 years old) who required ECMO (ECMO group, n=25) or ECMO and CRRT (ECMO+CRRT group, n=17) after cardiac surgery were reviewed. RESULTS: Forty-one out of 42 patients had elevated plasma-free hemoglobin (FHb) on the first day of ECMO. For all subjects, peak change (mean+/-SD) in FHb (Peak%C-FHb, 83.6+/-183%) correlated with serum lactic dehydrogenase (150+/-324%, r=0.49, p<0.05) and marginally with ECMO blood flow rate (BFR) (Peak%C-BFR, 36.8+/-51.0%, r=0.29, p=0.06). Compared with the ECMO group, the ECMO+CRRT group had a higher Peak%C-FHb (160+/-259%, p<0.05) and Peak%C-BFR (62+/-64%, p<0.05). Also, there was a significant increase in FHb one day after the initiation of CRRT compared with the level prior to CRRT (73.3+/-49.2 vs. 50.0+/-30.3 mg/dL, respectively, p=0.012). Serum creatinine (but not blood urea nitrogen) was significantly higher in the ECMO+CRRT group compared with the ECMO group. The percent change in serum creatinine during ECMO did not correlate with Peak%C-FHb in the ECMO group. CONCLUSION: Our findings suggest that there is enhanced hemolysis during combined ECMO and CRRT compared with ECMO alone. However, the clinical impact of increased hemolysis on renal function in patients receiving ECMO with or without CRRT remains to be determined.  相似文献   
8.
9.
Oscillatory motion of the normal cervical spinal cord   总被引:2,自引:0,他引:2  
  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