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   15545篇
  免费   1212篇
  国内免费   37篇
耳鼻咽喉   297篇
儿科学   326篇
妇产科学   213篇
基础医学   1983篇
口腔科学   523篇
临床医学   1492篇
内科学   3134篇
皮肤病学   201篇
神经病学   1744篇
特种医学   548篇
外科学   2179篇
综合类   244篇
一般理论   10篇
预防医学   1430篇
眼科学   266篇
药学   1056篇
  1篇
中国医学   9篇
肿瘤学   1138篇
  2023年   89篇
  2022年   145篇
  2021年   273篇
  2020年   199篇
  2019年   229篇
  2018年   297篇
  2017年   232篇
  2016年   242篇
  2015年   239篇
  2014年   391篇
  2013年   665篇
  2012年   880篇
  2011年   952篇
  2010年   553篇
  2009年   545篇
  2008年   952篇
  2007年   986篇
  2006年   1035篇
  2005年   980篇
  2004年   964篇
  2003年   971篇
  2002年   955篇
  2001年   167篇
  2000年   116篇
  1999年   150篇
  1998年   217篇
  1997年   197篇
  1996年   195篇
  1995年   163篇
  1994年   140篇
  1993年   108篇
  1992年   110篇
  1991年   110篇
  1990年   105篇
  1989年   79篇
  1988年   95篇
  1987年   83篇
  1986年   90篇
  1985年   95篇
  1984年   125篇
  1983年   137篇
  1982年   161篇
  1981年   140篇
  1980年   155篇
  1979年   73篇
  1978年   116篇
  1977年   94篇
  1976年   100篇
  1974年   74篇
  1972年   63篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.
4.
Diabetes mellitus(DM) negatively affects the development and progression of chronic liver diseases(CLD) of various etiologies. Concurrent DM and CLD are also associated with worse clinical outcomes with respect to mortality, the occurrence of hepatic decompensation, and the development of hepatocellular carcinoma(HCC). Unfortunately, early diagnosis and optimal treatment of DM can be challenging, due to the lack of established clinical guidelines as well as the medical complexity of this patient population. We conducted an exploratory review of relevant literature to provide an up-to-date review for internists and hepatologists caring for this patient population. We reviewed the epidemiological and pathophysiological associations between DM and CLD, the impact of insulin resistance on the progression and manifestations of CLD, the pathogenesis of hepatogenic diabetes, as well as the practical challenges in diagnosis and monitoring of DM in this patient population. We also reviewed the latest clinical evidence on various pharmacological antihyperglycemic therapies with an emphasis on liver disease-related clinical outcomes. Finally, we proposed an algorithm for managing DM in patients with CLD and discussed the clinical and research questions that remain to be addressed.  相似文献   
5.
6.
7.
8.
This study examined race and ethnic differences on the Draw A Person: Screening Procedure for Emotional Disturbance (DAP:SPED; Naglieri, McNeish, & Bardos, 1991) for youths 6 though 17 years of age for 2 matched samples. Samples were drawn from the DAP:SPED nationally representative standardization sample and matched on gender, grade, and school classroom. No statistically significant differences were found for big figure, small figure, or shading item composites. A statistically significant difference was found between Black-White pairs on figure omissions but showed a small effect size (d value = .25). Further, no statistically significant differences were found between the DAP:SPED Total T scores for Black and White youth (M = 47.67, SD = 10.09; N =138) or Hispanic and White youth (M = 48.20, SD = 9.56; N = 59), showing very small effect sizes. In addition, equivalence testing showed similarities across race and ethnic pairs for all composites and DAP:SPED total score, lending preliminary support to the DAP:SPED's clinical utility as a measure that yields similar scores across these groups.  相似文献   
9.
Schemes for stimulating adverse drug reporting are described with particular emphasis on a recently introduced Mississippi Adverse Drug Reaction Reporting Programme.  相似文献   
10.
BACKGROUND: The periodontal ligament (PDL) is a soft tissue interposed between the tooth and the alveolar bone. It is responsible for transmission of forces in vivo; this promotes bone remodeling. The purpose our study was to use fractal analysis to quantify the complex morphology of the PDL-bone interface. METHODS: We used Scion Image (Scion Corp, Frederick, Md) and Benoit fractal analysis (Tru Soft International, St. Petersburg, Fla) programs to calculate the fractal dimension of the PDL-bone interface in rats via the box-counting method. Rats in the experimental groups received an initial force of 0.1N or 0.5N with customized springs for 6 hours. RESULTS: Our studies showed an increase in normal fractal dimension at the root apices of the rats' maxillary molars. We also found evidence that the fractal dimension varies along the entire root length from the apex to the cementoenamel junction. CONCLUSIONS: Mechanical loading might lead to an increase in fractal dimension at the PDL-bone interface apart from mechanisms of bone cell directed remodeling. These changes in fractal dimension are proportional to loading and could provide a new parameter for force determination in orthodontic tooth movement.  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