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   6023篇
  免费   382篇
  国内免费   20篇
耳鼻咽喉   83篇
儿科学   591篇
妇产科学   107篇
基础医学   757篇
口腔科学   127篇
临床医学   375篇
内科学   1161篇
皮肤病学   286篇
神经病学   298篇
特种医学   227篇
外科学   585篇
综合类   229篇
一般理论   3篇
预防医学   357篇
眼科学   200篇
药学   507篇
中国医学   22篇
肿瘤学   510篇
  2023年   39篇
  2022年   46篇
  2021年   204篇
  2020年   137篇
  2019年   164篇
  2018年   199篇
  2017年   119篇
  2016年   147篇
  2015年   154篇
  2014年   259篇
  2013年   295篇
  2012年   372篇
  2011年   366篇
  2010年   232篇
  2009年   195篇
  2008年   261篇
  2007年   266篇
  2006年   245篇
  2005年   231篇
  2004年   195篇
  2003年   167篇
  2002年   145篇
  2001年   145篇
  2000年   116篇
  1999年   125篇
  1998年   68篇
  1997年   47篇
  1996年   57篇
  1995年   33篇
  1994年   51篇
  1993年   43篇
  1992年   86篇
  1991年   94篇
  1990年   95篇
  1989年   90篇
  1988年   72篇
  1987年   80篇
  1986年   60篇
  1985年   64篇
  1984年   65篇
  1983年   49篇
  1982年   64篇
  1981年   73篇
  1980年   71篇
  1979年   55篇
  1978年   34篇
  1977年   27篇
  1976年   33篇
  1973年   31篇
  1970年   26篇
排序方式: 共有6425条查询结果,搜索用时 19 毫秒
1.
Microbial co-infections are another primary concern in patients with coronavirus disease 2019 (COVID-19), yet it is an untouched area among researchers. Preliminary data and systematic reviews only show the type of pathogens responsible for that, but its pathophysiology is still unknown. Studies show that these microbial co-infections are hospital-acquired/nosocomial infections, and patients admitted to intensive care units with invasive mechanical ventilation are highly susceptible to it. Patients with COVID-19 had elevated inflammatory cytokines and a weakened cell-mediated immune response, with lower CD4+ T and CD8+ T cell counts, indicating vulnerability to various co-infections. Despite this, there are only a few studies that recommend the management of co-infections.  相似文献   
2.
3.
4.
5.
Mirror movements are simultaneous, involuntary, identical movements occurring during contralateral voluntary movements. These movements are considered as soft neurologic signs seen uncommonly in clinical practice. The mirror movements are described in various neurological disorders which include parkinsonism, cranio veretebral junction anamolies, and hemiplegic cerebral palsy. These movements are intriguing and can pose significant disability. However, no such observation regarding mirror movements in progressive hemifacial atrophy have been reported previously. We are reporting a teenage girl suffering from progressive hemifacial atrophy and epilepsy with demonstrable mirror movements in hand.  相似文献   
6.
7.
8.
9.
10.
This is a prospective, non-randomized study to evaluate and compare the results, morbidity and surgical time for endonasal carbon-dioxide laser assisted dacryocystorhinostomy and external dacryocystorhinostomy. 70 consecutive patients of chronic dacryocystitis with nasolacrimal duct obstruction were selected for the study. 36 patients under went endonasal CO2 laser assisted dacryocystorhinostomy and 34 had external dacryocystorhinostomy. Selection of the type of operation was left to the patient's choice. All the patients had preoperative counseling and both the procedures were explained in detail with their advantages and disadvantages. Patients not willing for the external incision were selected for endonasal laser assisted dacryocystorhinostomy and others were operated via external approach. Silicone tubes were put in all the patients for three months after surgery. The final follow up was 12 months after the removal of silicone tubes. The patency of the lacrimal passage was confirmed by irrigation, and patients were questioned about their symptoms. The success rates, 12 months after removal of silicone tubes were 100% in endonasal CO2 laser assisted dacryocystorhinostomy and 88.24% in external dacryocystorhinostomy. The surgical time of endonasal laser assisted dacryocystorhinostomy was 38 minutes as compared to 62 in external dacryocystorhinostomy. Complication rate in both groups was almost equal. Thus, we came to the conclusion that Endonasal CO2 laser assisted dacryocystorhinostomy is a better surgical option to external dacryocystorhinostomy in cases of chronic dacryocystitis with nasolacrimal duct obstruction, with shorter surgical time.  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