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   2757篇
  免费   304篇
  国内免费   8篇
耳鼻咽喉   63篇
儿科学   79篇
妇产科学   59篇
基础医学   425篇
口腔科学   98篇
临床医学   244篇
内科学   678篇
皮肤病学   60篇
神经病学   244篇
特种医学   83篇
外科学   330篇
综合类   118篇
一般理论   24篇
预防医学   178篇
眼科学   81篇
药学   158篇
中国医学   3篇
肿瘤学   144篇
  2023年   20篇
  2022年   24篇
  2021年   64篇
  2020年   34篇
  2019年   45篇
  2018年   72篇
  2017年   45篇
  2016年   42篇
  2015年   65篇
  2014年   67篇
  2013年   115篇
  2012年   159篇
  2011年   173篇
  2010年   79篇
  2009年   97篇
  2008年   146篇
  2007年   149篇
  2006年   114篇
  2005年   127篇
  2004年   112篇
  2003年   93篇
  2002年   103篇
  2001年   40篇
  2000年   76篇
  1999年   57篇
  1998年   41篇
  1997年   27篇
  1996年   21篇
  1995年   21篇
  1994年   20篇
  1992年   35篇
  1991年   36篇
  1990年   26篇
  1989年   28篇
  1988年   26篇
  1987年   34篇
  1986年   23篇
  1985年   28篇
  1983年   22篇
  1981年   30篇
  1980年   18篇
  1979年   38篇
  1978年   24篇
  1977年   19篇
  1976年   32篇
  1975年   34篇
  1974年   31篇
  1973年   20篇
  1968年   17篇
  1967年   17篇
排序方式: 共有3069条查询结果,搜索用时 15 毫秒
1.
The outbreaks of rabies in humans transmitted by Desmodus rotundus in 2004 and 2005, in the northeast of the Brazilian State of Para, eastern Amazon basin, made this a priority area for studies on this zoonosis. Given this, the present study provides data on this phenomenon in an urban context, in order to assess the possible circulation of the classic rabies virus (RABV) among bat species in Capanema, a town in the Amazon basin. Bats were collected, in 2011, with mist nets during the wet and dry seasons. Samples of brain tissue and blood were collected for virological and serological survey, respectively. None of the 153 brain tissue samples analyzed tested positive for RABV infection, but 50.34% (95% CI: 45.67-55.01%) of the serum samples analyzed were seropositive. Artibeus planirostris was the most common species, with a high percentage of seropositive individuals (52.46%, 95% CI: 52.31 52.60%). Statistically, equal proportions of seropositive results were obtained in the rainy and dry seasons (c2 = 0.057, d.f. = 1, p = 0.88). Significantly higher proportions of males (55.96%, 95% CI: 48.96-62.96%) and adults (52.37%, 95% CI: 47.35-57.39%) were seropositive. While none of the brain tissue samples tested positive for infection, the high proportion of seropositive specimens indicates that RABV may be widespread in this urban area.  相似文献   
2.
3.
4.
5.
Linear IgA disease (LAD) is a rare acquired autoimmune bullous disorder, characterized by linear deposition of IgA along the dermoepidermal basement membrane zone. The clinical presentation of LAD consists of vesiculobullous lesions affecting the skin and mucosal surfaces. The present case report presents a rare presentation of this vesiculobullous disorder. Although more than 50% of LAD patients present with oral lesions, there are few reported cases of involvement of the mouth as the sole manifestation. A 79-year-old female presented with a sore mouth and erosions affecting the palate. The symptoms resolved following the provision of mycophenolate, an antiproliferative immunosuppressant which has not previously appeared to have been reported in the long-term successful management of linear IgA disease limited to the mouth. We found that mycophenolate is a useful adjunct to the successful treatment of oral linear IgA when the uses of other immunosuppressants are contraindicated.  相似文献   
6.
7.
Abstract The effectiveness of a 5% potassium nitrate dentifrice as a daily home treatment for dentinal hypersensitivity was evaluated in a double-blind study in 36 Japanese subjects who complained of cold and/or tactile hypersensitivity. The subjects were divided into 2 groups, with 18 being given a 5% potassium nitrate dentifrice (treated group) and the other 18 a vehicle paste (control group). Both groups were instructed to brush their teeth 2 × a day. The hypersensitivity levels of the affected teeth were assessed by 2 stimuli, one tactile and the other cold air, and by the perception of pain. The results of all 3 assessment methods indicated that the potassium nitrate dentifrice significantly decreased the level of hypersensitivity at weeks 4, 8, and 12. In the treated group, a rapid decrease of positive scores for both the cold air stimulus and the subjective symptoms appeared from week 2. Although a significant decrease of the assessment score was also observed in the control group, the reduction rate of the score was much greater in the treated group by ail 3 assessment methods at weeks 4, 8, and 12. Complete relief of subjective symptoms throughout the 12 weeks’examination was noted in 67% of the subjects in the treated group, but in only 6% in the control group. These results suggest the usefulness of a 5% potassium nitrate dentifrice in Japanese patients with dentinal hypersensitivity.  相似文献   
8.
Objective: To determine the contribution of several variables to fluid loss during transcervical resection of submucous myomas.Design: An observational study using multiple linear regression analyses.Setting: A university-affiliated training hospital and a university department of clinical epidemiology and biostatistics.Patient(s): Patients with submucous myomas.Intervention(s): Transcervical resection of submucous myomas and monitoring of fluid loss.Main Outcome Measure(s): Patient age, uterine enlargement, treatment with GnRH analogues or 8-ornithine-vasopressin, type of anesthesia, number of myomas, intramural extension of the myoma (type of myoma), and operating time were tested as variables.Result(s): Only intramural extension of the myoma and operating time were obviously related to fluid loss. For the other variables, such a relation was weak at best. The relation between fluid loss and operating time was not modified by any of the other variables.Conclusion(s): Because fluid loss is an important limiting factor in the transcervical resection of submucous myomas, special attention should be paid to reduction of the operating time and preoperative assessment of the intramural extension of the myoma to guide appropriate patient selection.  相似文献   
9.
The authors present the third installment of the guidelines and recommendations from the Safety Committee of the Society for Magnetic Resonance Imaging (now the Society of Magnetic Resonance) concerning various issues related to the safety and management of patients undergoing magnetic resonance (MR) procedures. This document was developed to provide standardized and consistent information for use by health practitioners involved in screening patients or other individuals for MR procedures.  相似文献   
10.
Effects of Ethanol on the Contractile Function of the Heart: A Review   总被引:7,自引:0,他引:7  
Chronic ethanol consumption leads to a number of alterations in the contractile function of the heart and is a leading cause of cardiomyopathy. Ethanol also has an acute negative inotropic effect mediated by direct interaction with cardiac muscle cells, although this action is often masked by indirect actions resulting from enhanced release of catecholamines in vivo. This article reviews the effects of ethanol on the contractile function of the heart. The specific targets affected by ethanol in cardiac muscle cells are discussed in terms of potential mechanisms underlying the depressions of contractility resulting from both acute and chronic actions of ethanol.  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