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   2376635篇
  免费   195201篇
  国内免费   4213篇
耳鼻咽喉   34274篇
儿科学   72821篇
妇产科学   62961篇
基础医学   335090篇
口腔科学   67564篇
临床医学   215763篇
内科学   469026篇
皮肤病学   47952篇
神经病学   200952篇
特种医学   96003篇
外国民族医学   886篇
外科学   360622篇
综合类   56285篇
现状与发展   1篇
一般理论   977篇
预防医学   190798篇
眼科学   55480篇
药学   177708篇
  4篇
中国医学   4371篇
肿瘤学   126511篇
  2018年   24249篇
  2016年   20619篇
  2015年   23317篇
  2014年   33596篇
  2013年   50940篇
  2012年   68854篇
  2011年   72393篇
  2010年   42548篇
  2009年   40930篇
  2008年   68872篇
  2007年   73229篇
  2006年   74102篇
  2005年   72130篇
  2004年   69435篇
  2003年   67120篇
  2002年   66332篇
  2001年   112494篇
  2000年   116556篇
  1999年   98366篇
  1998年   27880篇
  1997年   25538篇
  1996年   25464篇
  1995年   24625篇
  1994年   23165篇
  1993年   21561篇
  1992年   79406篇
  1991年   76405篇
  1990年   73596篇
  1989年   70854篇
  1988年   65866篇
  1987年   64813篇
  1986年   61339篇
  1985年   58414篇
  1984年   44233篇
  1983年   37664篇
  1982年   22895篇
  1981年   20345篇
  1980年   19043篇
  1979年   41323篇
  1978年   28998篇
  1977年   24357篇
  1976年   22841篇
  1975年   23976篇
  1974年   29644篇
  1973年   28058篇
  1972年   26239篇
  1971年   24166篇
  1970年   22763篇
  1969年   21097篇
  1968年   19144篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
961.
962.
The role of timing of transplant nephrectomy after renal transplantation has not been well defined. This report compares the morbidity, mortality, and hospitalization costs of 37 patients undergoing transplant nephrectomy within 14 days after graft failure and return to dialysis, with 31 patients undergoing delayed transplant nephrectomy (less than 14 days after graft failure and return to dialysis). This analysis revealed that there were no significant (P greater than .05) differences in patient morbidity and mortality between these groups. There was, however, a substantial increase (P less than .05) in the cost of hospitalization in the delayed nephrectomy group. For this reason, we recommend early nephrectomy after renal transplant failure in order to minimize the cost of health care for these patients undergoing failed cadaver donor transplant nephrectomy.  相似文献   
963.
A sample consisting of 1135 edentulous patients with clinically healthy denture bearing areas, was examined radiologically. It appears that the diagnostic yield is high whereas the expected radiation induced risk is low. Patients should therefore be examined radiologically prior to full denture construction.  相似文献   
964.
965.
966.
967.
The value of maternal C-reactive protein (CRP) levels as predictors of fetal and maternal infective morbidity and fetal mortality was assessed prospectively over a 6-month period in all cases of premature rupture of the fetal membranes or suspected premature labour. Statistical analysis of results showed that CRP at a level of 1.32 mg/dl is a sensitive marker of infective morbidity in mother and neonate. Furthermore, there was a significant association between raised CRP levels and low-birth-weight babies, suggesting that intra-uterine infection is a major cause of prematurity in the study population.  相似文献   
968.
The second documented case of renal aspergilloma due to Aspergillusflavus is presented. The merits of the medical therapy thatfailed are discussed. Pathological examination showed a nidusof aspergillus around suture material persisting from a pyelolithotomyoperation 2 years before in India. We argue that this was thereason for the failure of the medical therapy. This is the firstcase of its kind reported.  相似文献   
969.
A study of intravenous (i.v.) cannula usage for medical emergencies admitted to hospitals in the Newham Health District was undertaken during two defined periods (24 and 35 days). Almost half the cannulas inserted (47%) were not flushed following an initial bolus injection of heparinized saline. The duration that cannulas remained in a vein ranged from 24 hours to 8 days (median 2 days) and inflammation around the cannula site was related to the length of time since insertion but unrelated to whether the cannula was flushed regularly or to the type of fluid used. Our findings indicate a substantial wastage of i.v. cannulas due to difficulties with insertion and suggest that isotonic saline, without heparin, is effective in maintaining cannula patency for 48 hours. It is concluded that these findings are not unique to the Newham Health District and worthwhile financial savings should be achieved throughout the NHS if clinicians reconsider the indications and use of i.v. cannulas for their patients.  相似文献   
970.
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