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   5535篇
  免费   308篇
  国内免费   47篇
耳鼻咽喉   77篇
儿科学   230篇
妇产科学   110篇
基础医学   582篇
口腔科学   269篇
临床医学   806篇
内科学   1195篇
皮肤病学   101篇
神经病学   408篇
特种医学   202篇
外科学   784篇
综合类   61篇
一般理论   2篇
预防医学   480篇
眼科学   58篇
药学   297篇
中国医学   15篇
肿瘤学   213篇
  2023年   31篇
  2022年   24篇
  2021年   61篇
  2020年   43篇
  2019年   84篇
  2018年   135篇
  2017年   87篇
  2016年   71篇
  2015年   147篇
  2014年   129篇
  2013年   228篇
  2012年   301篇
  2011年   302篇
  2010年   196篇
  2009年   164篇
  2008年   292篇
  2007年   272篇
  2006年   226篇
  2005年   204篇
  2004年   194篇
  2003年   163篇
  2002年   199篇
  2001年   182篇
  2000年   166篇
  1999年   162篇
  1998年   127篇
  1997年   125篇
  1996年   116篇
  1995年   94篇
  1994年   78篇
  1993年   88篇
  1992年   99篇
  1991年   102篇
  1990年   99篇
  1989年   96篇
  1988年   116篇
  1987年   65篇
  1986年   56篇
  1985年   73篇
  1984年   39篇
  1983年   34篇
  1982年   26篇
  1980年   26篇
  1979年   47篇
  1978年   23篇
  1977年   22篇
  1976年   22篇
  1975年   27篇
  1974年   26篇
  1969年   24篇
排序方式: 共有5890条查询结果,搜索用时 15 毫秒
1.
2.
3.
In an outpatient rehabilitation setting, both patients’ use and therapists’ knowledge of complementary and alternative medicine (CAM) varies widely. Based on this observation and a recognition of CAM as an emerging practice area for rehabilitation professionals, it was felt that a thorough and consistent approach to the education and orientation of physical therapists to the world of CAM and integrative care was needed. This special interest paper will describe one center’s approach, development, and use of a unique and comprehensive training manual designed to provide both a structured and standardized approach for educating physical therapists about CAM and related therapeutic modalities. This innovative teaching tool allows for multiple methods of content delivery within a multidisciplinary format and can be used for those who practice currently or desire to practice in an integrative care environment.  相似文献   
4.
After total gastrectomy, the ileocecal graft may act as a reservoir and protect against reflux but give rise to transposition of the ileum and cause possible changes in bile acid metabolism and nutrition. This study compared the ileocecal graft and jejunal pouch. Male Wistar rats weighing 265 +/- 22 g were submitted to sham operation (S), ileocecal interposition graft (IIG), and jejunal pouch interposition graft (JP) after total gastrectomy. Eight weeks later, the esophagus was examined for evidence of esophagitis. Nutritional biochemistry and weight profile were documented preoperatively and 8 weeks after surgery. The oral glucose tolerance test was performed. Thirty-three rats were operated on and 30 survived for 8 weeks. Esophagitis occurred in seven JP rats. Body weight was significantly higher in IIG than in JP rats (p < .05). Normal glucose tolerance to intragastric glucose load was observed in sham and operated rats. JP rats had a significant decrease in serum albumin, glucose, transferrin, hemoglobin, iron, folate, and calcium, compared to sham (p < .05). Cobalamine was significantly lower in IIG rats than in JP rats (p < .05). In the IIG and JP groups, serum/hepatic total bile acid did not differ significantly from preoperative and sham values. In conclusion, the IIG interposition graft in rats prevented esophagitis, preserved nutrition, and did not interfere with enterohepatic total bile acid circulation.  相似文献   
5.
It is estimated that 5% to 10% of pancreatic cancer cases are attributable to hereditary factors. We believe that the number of cases that are genetic in etiology are even greater, however, based not on a classic autosomal dominant pattern of inheritance but rather when one takes into account low-penetrant inherited susceptibility factors. There is also a growing recognition that the development of pancreatic cancer in pancreatic cancer-prone families is dependent not only on genetic variables but on nongenetic factors. The aim of this article is to review the challenges in identifying pancreatic cancer-prone families and how environmental factors interact with genetic factors in these families.  相似文献   
6.
7.
8.
9.
A partnership between corporate worksites, a community-based prevention agency, and families in those worksites is described. Its primary goals were the reduction of family risk and enhancement of family protective factors that predispose children and youth to substance abuse and related social and emotional difficulties. A related goal of the program is to reduce family stress levels and attitudes that may influence the parents' levels of risk for substance abuse and related disorder. The program delivery strategy is conceived of as part of the necessart efforts of prevention programs to reach target populations in host settings in which they may naturally participate, thereby reducing obstacles and barriers to participation that often impede prevention efforts. Evaluation revealed that the program was generally better able to retain parents for a fairly lengthy period, and with high rates of attendance. Program attendance was also not affected by parental background characteristics that, in other delivery approaches, are often associated with poor attendance and high drop-out levels. Results also indicated that levels of program exposure (dosage) do make a significant difference in the efficacy of such efforts as those parents in the program who participated in higher percentages and numbers of sessions (i.e. more than 80% of sessions) showed both short-term and longer-term (i.e. across 18 month follow-ups) gains in their ratings of the target child's behavior problems and strengths, substance abuse resistance related knowledge and attitudes, reduced parental stress, depression and irritability, and increased utilization of social support. By contrast, parents who received a low program exposure exhibited a more restricted set of short-term gains. The findings are discussed in terms of their importance for consideration of program dosage for prevention programs, and the need to attend to the context in which programming is offered as it may facilitate or impede efforts to provide levels of dosage and fidelity to create enduring impacts  相似文献   
10.
BACKGROUND: Experimental and clinical evidence suggests that respiratory syncytial virus (RSV) bronchiolitis is an immune mediated disease. Corticosteroids might therefore be effective in the treatment of RSV bronchiolitis. METHODS: A randomised double blind trial was conducted in children up to two years of age admitted to hospital with RSV bronchiolitis to compare prednisolone (1 mg/ kg/day orally for seven days) with placebo. Variables used for the efficacy analysis were a daily symptom score and the length of time in hospital in the non- ventilated patients, and the duration of mechanical ventilation and the length of time in hospital in the ventilated patients. RESULTS: Fifty four patients were included in the trial, 40 of whom were non- ventilated (20 in each group) and 14 were ventilated (seven in each group). During the first three days of treatment the symptom score decreased significantly faster in the prednisolone group than in the placebo group (mean (SE) decrease -1.2 (0.2) points/day versus -0.6 (0.2) points/day; mean (95% confidence interval (CI)) for difference = - 0.6 (-0.1 to -1.2); p = 0.02). The mean duration of hospital stay of all 40 non-ventilated patients was not significantly different between the two groups. In the ventilated patients the duration of mechanical ventilation was not significantly different, but the length of time in hospital was six days shorter in the prednisolone group than in the placebo group (mean (SE) 11.0 (0.7) versus 17.0 (2.0) days; mean (95% CI) difference = 7.0 (1.8 to 10.2) days; p < 0.01). CONCLUSIONS: These results suggest that prednisolone may be effective in accelerating the clinical recovery of children admitted to hospital with RSV bronchiolitis.


  相似文献   
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