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   16499篇
  免费   767篇
  国内免费   129篇
耳鼻咽喉   513篇
儿科学   1262篇
妇产科学   533篇
基础医学   1168篇
口腔科学   967篇
临床医学   1266篇
内科学   2806篇
皮肤病学   396篇
神经病学   1065篇
特种医学   746篇
外国民族医学   2篇
外科学   3451篇
综合类   508篇
现状与发展   1篇
一般理论   7篇
预防医学   607篇
眼科学   492篇
药学   958篇
  4篇
中国医学   171篇
肿瘤学   472篇
  2024年   17篇
  2023年   193篇
  2022年   219篇
  2021年   381篇
  2020年   280篇
  2019年   332篇
  2018年   508篇
  2017年   475篇
  2016年   532篇
  2015年   458篇
  2014年   677篇
  2013年   899篇
  2012年   989篇
  2011年   1058篇
  2010年   589篇
  2009年   391篇
  2008年   882篇
  2007年   962篇
  2006年   977篇
  2005年   951篇
  2004年   1066篇
  2003年   1071篇
  2002年   986篇
  2001年   642篇
  2000年   633篇
  1999年   403篇
  1998年   156篇
  1997年   126篇
  1996年   105篇
  1995年   51篇
  1994年   45篇
  1993年   34篇
  1992年   37篇
  1991年   22篇
  1990年   17篇
  1989年   30篇
  1988年   24篇
  1987年   16篇
  1986年   22篇
  1985年   10篇
  1984年   15篇
  1983年   8篇
  1982年   9篇
  1980年   6篇
  1979年   7篇
  1978年   7篇
  1977年   7篇
  1974年   8篇
  1972年   8篇
  1967年   8篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
BackgroundWomen suffering from kidney disease are more prone to fertility problems, due to uremia. Fortunately, their fertility rate increases dramatically after renal transplantation. This study analyzes the predictors/risk factors of successful pregnancy with live birth outcome while presenting an overview of the 7-year experience of a single center.MethodsThis retrospective cohort study includes 239 women of reproductive age (18–40 years) who underwent renal transplantation in a tertiary Turkish clinic between October 1, 2011, and August 24, 2017. The subjects were invited to take part in a survey questioning their obstetric characteristics and they were assessed in 2 groups: fertile and infertile. Multivariable linear regression analysis was conducted to determine the predictors of a successful pregnancy.ResultsThirty-five 35 patients wished to become pregnant: 12 got pregnant spontaneously, while 21 failed to become pregnant (spontaneously). The mean age of the patients at the survey was 34 ± 7. Regular menstrual cycles after renal transplantation, tacrolimus-mycophenolate mofetil maintenance protocol, and age at transplantation were found to be predictors of spontaneous pregnancy. The duration of peritoneal dialysis was significantly longer in the infertile group (48 vs 12 months).ConclusionEnd-stage renal disease's negative impacts, including menstrual abnormality and fertility problems, can be overcome by successful kidney transplantation with appropriate immunosuppression. Minimizing the duration of peritoneal dialysis, particularly in patients who desire future fertility, may be accepted as a logical management strategy.  相似文献   
3.
Graefe's Archive for Clinical and Experimental Ophthalmology - To evaluate central macular thickness (CMT), subfoveal choroidal thickness (SFCT), and visual outcomes following different...  相似文献   
4.
Summary A new modification of microvenous anastomosis, which has increased patency rates while simultaneously decreasing the difficulty of the procedure, is presented in this paper. The primary purpose of this study was to compare the classical and the temporary stent techniques of microvenous anastomosis. Because of problems such as mixing and tangling of strings during insertion and tying of the last four sutures while applying the temporary stent technique, we decided to modify the procedure. The silastic tube was removed through an incision (venotomy), distant from the actual suture line. This modified technique and the other above mentioned techniques were carried out on rat femoral veins. The results indicate that this modification has increased patency rates, shortened the time of anastomosis and facilitated the procedure.  相似文献   
5.
Serum digoxin-like factor was detected in infants of diabetic mothers who were insulin-dependent or diet controlled. No statistical difference was found between the serum digoxin-like factor levels of the infants of diabetic mothers and the controls.  相似文献   
6.
Introduction Iniencephaly, a neural tube defect involving occiput and inion and combined with rachischisis of the cervical, thoracic spine, and retroflexion position of the head is a very rare congenital abnormality of the fetus–newborn with a 0.1–10 of 10,000 prevalence. This abnormality’s prognosis is thought to be dismal. This abnormality can be associated with other abnormalities such as anencephaly, encephalocele, hydrocephalus, cyclopia, absence of the mandible, cleft lip and palate, cardiovascular disorders, diaphragmatic hernia, renal abnormalities, overgrowth of the arms compared to the legs, and club food and gastrointestinal atresia. Discussion Most of the patients are dead born, and the others die in a few hours. There are only six previously documented long-term survivors. In our case, our patient with iniencephalic signs and findings is still living. She is 2 years old now. We think that this patient presents a mild form of iniencephaly.  相似文献   
7.
Abstract – Traumatic dental injuries often occur to the teeth and their supporting tissues and they are the main reasons for emergency visit to a dental clinic. Management of a fracture depends on its position and the extent of root involvement. Horizontal root fractures are not seen frequently and the treatment consists of reduction and long‐term rigid fixation of the coronal segment. The present case demonstrates the successful management of two horizontally fractured maxillary central incisors with a follow‐up period of 9 months.  相似文献   
8.
The levels and temporal variations of surface ozone at a coastal site in East China during summer and autumn were analyzed and the influences of meteorological parameters on ozone were investigated. An inland city was chosen as a comparison site. The main results and conclusions of this study are: (1) ozone pollution, with a maximum 1 h concentration of 150.98 ppbv, was severe during summer and autumn at the coastal site; (2) the ozone level was obviously higher at the coastal site than that at the inland site in September; (3) besides temperature and solar radiation, sea-land breeze circulation is an important factor influencing the ozone level at the coastal site, and sea breeze often induce high ozone levels (the average ozone concentration for sea breeze was about 13 ppbv higher than that for land breeze).  相似文献   
9.
29例非胰岛素依赖型糖尿病合并周围神经病变患者分成两组:一组为控制血糖组共12例,经8个月严格控制血糖,正中、尺、腓运动神经传导速度和正中、尺感觉神经潜伏期获改善,而且改善的程度与空腹血糖和糖基化血红蛋白降低的程度密切相关;另一组为针灸加控制血糖组共17例,经1与3个月的治疗,分别有82.4%和90.0%的患者神经病变临床症状得到改善,但正中、尺、腓运动神经传导速度和正中、尺感觉神经潜伏期未得到改善。  相似文献   
10.
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