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   4376篇
  免费   225篇
  国内免费   24篇
耳鼻咽喉   93篇
儿科学   92篇
妇产科学   96篇
基础医学   395篇
口腔科学   169篇
临床医学   323篇
内科学   1082篇
皮肤病学   56篇
神经病学   246篇
特种医学   136篇
外国民族医学   1篇
外科学   861篇
综合类   105篇
一般理论   6篇
预防医学   251篇
眼科学   127篇
药学   297篇
中国医学   13篇
肿瘤学   276篇
  2023年   42篇
  2022年   71篇
  2021年   216篇
  2020年   110篇
  2019年   121篇
  2018年   178篇
  2017年   120篇
  2016年   141篇
  2015年   141篇
  2014年   172篇
  2013年   246篇
  2012年   351篇
  2011年   358篇
  2010年   208篇
  2009年   165篇
  2008年   281篇
  2007年   260篇
  2006年   198篇
  2005年   240篇
  2004年   187篇
  2003年   175篇
  2002年   168篇
  2001年   49篇
  2000年   29篇
  1999年   36篇
  1998年   37篇
  1997年   23篇
  1996年   21篇
  1995年   19篇
  1994年   17篇
  1993年   8篇
  1992年   19篇
  1991年   9篇
  1990年   15篇
  1989年   16篇
  1988年   10篇
  1987年   12篇
  1986年   14篇
  1985年   10篇
  1984年   13篇
  1982年   15篇
  1981年   15篇
  1980年   14篇
  1979年   6篇
  1978年   11篇
  1977年   5篇
  1976年   7篇
  1971年   6篇
  1970年   8篇
  1969年   5篇
排序方式: 共有4625条查询结果,搜索用时 46 毫秒
1.
2.
AIM: To introduce a novel technique for transscleral fixation of the PC-IOL that requires no sutures on the IOL haptics. METHODS: Instead of suturing polypropylene onto the IOL haptics, the method simply winds the thread on the haptics. Fifteen eyes of 15 patients underwent this technique and were followed up for more than 18 months. Surgical outcomes and post-operative complications were evaluated and compared with those of the conventional transscleral fixation method. RESULTS: Postoperative cylinder was significantly lower in the thread winding group than in the conventional transscleral fixation method group (-1.02±0.46 diopters vs -1.57±0.77 diopters; P=0.01). Further, no postoperative complications, such as optic capture, IOL dislocation, and hyphema, were detected in the thread winding group. CONCLUSION: We believe that our thread winding technique is better than previously reported methods because it is simple, mechanically stable, and free from suture-related complications.  相似文献   
3.

The Centers for Disease Control and Prevention (CDC) and 35 partner organizations have engaged in developing an agenda for Preconception Health. A summit was held in June 2005 to discuss the current state of knowledge regarding preconception care and convene a select panel to develop recommendations and action steps for improving the health of women, children, and families through advances in clinical care, public health, and community action. A Select Panel on Preconception Care, convened by CDC, deliberated critical related issues and created refined definition of preconception care. The panel also developed a strategic plan with goals, recommendations, and action steps for improving preconception health. The recommendations and action steps are specific to the implementation of health behavior, access, consumer demand, research, and surveillance activities for monitoring and improving the health of women, children and families. The outcome of the deliberations is the CDC publication of detailed recommendations and action steps in the Morbidity and Mortality Weekly Report series, Recommendations and Reports.

  相似文献   
4.
5.
6.
7.
 Granulocytic sarcoma is an uncommon extraskeletal tumor most frequently associated with leukemia. We present a case of bone location with unusual pattern in a patient with no evidence of myeloproliferative disorder at presentation or follow-up.  相似文献   
8.
We report a case of erythrodermic type of bullous pemphigoid which is a rare variant of bullous pemphigoid. Our patient had a peculiar clinical presentation with bullae, erosions and extensive erythrodermic areas, and distinct direct immunofluorescent findings which included linear IgG and C3 deposits in the basement membrane and also IgG in the intercellular spaces. Very high levels of serum IgE were also detected in our patient.  相似文献   
9.
This Australian study monitored the effects of monthly plasmapheresis on donor serum IgG and IgM levels in 127 new and 124 established plasma donors who donated 1014 units over a five-month period. Of the 251 donors, 3% had reduced total serum protein (TSP) levels, 7% had low IgG levels and 12% had low IgM levels prior to donation on at least one occasion over the study period. Statistical analysis showed that the TSP, IgG and IgM levels of new donors who had donated plasma on less than 10 occasions were no more likely to fall below normal than those of old donors. However, new and old donors whose IgG or IgM levels fell below normal at any time during the study had significantly lower levels of the relevant parameter on entry to the study. Followed longitudinally, IgG and IgM levels in old and new donors tended to fall, although levels fluctuated throughout the study. Statistical analysis failed to show any correlation between TSP levels and IgG or IgM levels. These parameters did not correlate significantly with the number of previous plasmaphereses, donor weight, volume collected or history of infection. This study highlighted the need for regular, specific quantitation of IgG and IgM levels as well as TSP in regular plasmapheresis donors. The frequency of testing is yet to be determined, in view of the high materials and labour costs of such a programme.  相似文献   
10.
Two matched samples of Arab female undergraduate students attending London and Cairo Universities were recruited to determine the relative prevalence of abnormal eating attitudes and the effect of exposure to Western culture upon this prevalence. A positive response was reported on the Eating Attitudes Test (EAT-40) in 22% of the students in the London group and 12% in the Cairo group, indicating that abnormal attitudes occur in this non-Western population. Six cases among the London sample fulfilled diagnostic criteria for bulimia nervosa, but no cases of either anorexia or bulimia were identified in the Cairo sample.  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