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   1631篇
  免费   96篇
  国内免费   5篇
耳鼻咽喉   39篇
儿科学   64篇
妇产科学   29篇
基础医学   182篇
口腔科学   19篇
临床医学   127篇
内科学   340篇
皮肤病学   124篇
神经病学   79篇
特种医学   15篇
外科学   244篇
综合类   47篇
一般理论   1篇
预防医学   93篇
眼科学   18篇
药学   194篇
中国医学   5篇
肿瘤学   112篇
  2023年   12篇
  2022年   24篇
  2021年   36篇
  2020年   34篇
  2019年   34篇
  2018年   48篇
  2017年   31篇
  2016年   36篇
  2015年   33篇
  2014年   49篇
  2013年   58篇
  2012年   92篇
  2011年   104篇
  2010年   62篇
  2009年   54篇
  2008年   92篇
  2007年   83篇
  2006年   76篇
  2005年   43篇
  2004年   47篇
  2003年   51篇
  2002年   53篇
  2001年   62篇
  2000年   58篇
  1999年   53篇
  1998年   19篇
  1997年   13篇
  1996年   24篇
  1995年   16篇
  1994年   13篇
  1993年   11篇
  1992年   29篇
  1991年   23篇
  1990年   26篇
  1989年   19篇
  1988年   28篇
  1987年   15篇
  1986年   15篇
  1985年   10篇
  1984年   12篇
  1983年   11篇
  1982年   6篇
  1980年   7篇
  1979年   15篇
  1978年   14篇
  1977年   8篇
  1976年   7篇
  1975年   8篇
  1974年   9篇
  1973年   11篇
排序方式: 共有1732条查询结果,搜索用时 15 毫秒
71.
Between 1 October 1997 and 1 November 1998, 43 patients (59 feet) were treated with a standard Mitchell's osteotomy for hallux valgus. Of these, 26 patients (36 feet) were treated postoperatively in a forefoot plaster. The other 17 patients (23 feet) were treated with a wooden soled shoe. There was no significant difference between the 2 groups for age, indication for surgery, pre-operative deformity or grade of the operating surgeon. There was no significant difference in the mean time immobilised, mean time to union or complications. The patients were interviewed by telephone after a mean follow-up of 9.4 months. There was no significant difference in results between the 2 groups. This suggests that a forefoot plaster following Mitchell's osteotomy is unnecessary. Postoperative mobilisation in a wooden soled shoe can be used as an alternative.  相似文献   
72.
Several appropriately substituted 4-(dialkylamino-alkyl)-substituted-styryl-alkyl ketones or acetophenones were prepared and subjected to the Mannich reaction to yield compounds that would incorporate both alpha,beta-unsaturated keto groups and a substituted aminomethyl function with or without another olefinic moiety at position 4. The spermicidal activity of the prepared compounds was evaluated. Several compounds 2d, 4a and 4e were found to possess spermicidal activity at 0.005% concentration, while compounds 2a, 2c, 2f, 3a and 4b were active at 0.01% concentration. Compounds 2a, 2c, 3a, 4a and 4e also inhibited the interaction between recombinant HIV Env and CD4. Out of these, compound 2c was found to be most active.  相似文献   
73.
Managing perioperative hypothermia   总被引:1,自引:0,他引:1  
  相似文献   
74.
Predominantly cystic acoustic neuromas are rare and they usually present with clinical and radiological features different from their more common solid counterparts. Two cases of cystic acoustic neuromas are reported here.  相似文献   
75.
BACKGROUND: Advanced age is considered to be a relative contraindication for radical esophagectomy with a three-field lymph node dissection. METHODS: Preoperative risks, postoperative morbidity and mortality, and long-term survival in 55 elderly patients (> or =70 years) who had undergone extensive esophagectomy for esophageal carcinoma were compared with those of 149 younger patients (<70 years). RESULTS: Elderly patients had worse preoperative cardiopulmonary function and had more frequent postoperative cardiopulmonary complications compared with younger patients (p < 0.05). The postoperative death rate was not statistically different between the elderly (10.9%) and younger groups (5.4%). When the study period was divided into an early and a late phase, the postoperative death rate dropped significantly (p < 0.05) in recent years (1.4%) when compared with the previous era (10.0%). The overall survival rates were not different between elderly and younger patients. CONCLUSIONS: Preoperative cardiopulmonary risk factors and postoperative complications after esophagectomy were more frequently noticed in elderly patients than in younger patients. A dramatic improvement in postoperative death was noticed in recent years. The long-term survival of elderly patients after extended esophagectomy was almost similar to that in younger patients.  相似文献   
76.
Coronary artery bypass combined with bilateral carotid endarterectomy   总被引:2,自引:0,他引:2  
Dylewski M  Canver CC  Chanda J  Darling RC  Shah DM 《The Annals of thoracic surgery》2001,71(3):777-81; discussion 781-2
BACKGROUND: Surgical management of patients presenting for coronary artery bypass grafting with significant bilateral carotid artery stenosis has not been well defined. In this study, our preliminary results of coronary artery bypass grafting with concomitant bilateral carotid endarterectomy have been reviewed. METHODS: A retrospective nonrandomized chart review was performed in 33 patients with unstable angina and bilateral carotid artery stenosis, more than 70%, undergoing simultaneous coronary artery bypass grafting and bilateral carotid endarterectomy using an eversion technique. RESULTS: Concomitant coronary artery bypass grafting with bilateral carotid endarterectomy was performed urgently in 24 (73%) and electively in 9 (27%) patients. The average carotid artery cross-clamp and total perfusion times were 14.7 +/- 4.9 minutes and 123 +/- 29.2 minutes, respectively. The average length of stay in the cardiopulmonary intensive care unit was 4.2 +/- 14.2 days and total hospital stay was 16.2 +/- 20.5 days. Postoperative in-hospital stay was 14.9 +/- 20.3 days. There were no postoperative strokes. Twenty-one (64%) patients were discharged before the tenth postoperative day. Nonfatal postoperative complications occurred in 27% (9 of 33) of patients. The overall 30-day mortality was 6.1% (2 of 33) and that was unrelated to primary cardiac or cerebrovascular events. CONCLUSIONS: Favorable outcome supports the justification for performing concomitant coronary artery bypass grafting with bilateral carotid endarterectomies in selected patients.  相似文献   
77.
78.
We tried to determine the role of the body mass index (BMI) on the extent of lymph node dissection in gastric cancer surgery. Seven hundred and eighty-seven patients with gastric carcinoma were reviewed. Ninety-two (11%) patients exceeded the upper limit of the optimum BMI. Significantly fewer lymph nodes were removed following D2 (p = 0.002) and >/=D3 (p = 0.023) dissections, and the lymph node ratio was significantly (p = 0.0383) higher in overweight patients. The recurrence-free survival was significantly (p = 0.0297) shorter in T2/T3 cases with high BMI, and BMI (relative risk 1.85) became an independent prognostic factor in multivariate analysis. Higher BMI hampers regional lymph node dissection in gastric cancer patients and became an independent predictor of disease recurrences in T2/T3 gastric cancers.  相似文献   
79.
80.
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