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   29626篇
  免费   1964篇
  国内免费   302篇
耳鼻咽喉   540篇
儿科学   497篇
妇产科学   387篇
基础医学   4770篇
口腔科学   894篇
临床医学   2668篇
内科学   5810篇
皮肤病学   1079篇
神经病学   2131篇
特种医学   1971篇
外科学   3551篇
综合类   161篇
现状与发展   3篇
一般理论   8篇
预防医学   1190篇
眼科学   513篇
药学   2736篇
  1篇
中国医学   427篇
肿瘤学   2555篇
  2023年   213篇
  2022年   737篇
  2021年   1100篇
  2020年   595篇
  2019年   817篇
  2018年   967篇
  2017年   767篇
  2016年   1125篇
  2015年   1530篇
  2014年   1599篇
  2013年   1926篇
  2012年   2703篇
  2011年   2505篇
  2010年   1555篇
  2009年   1268篇
  2008年   1670篇
  2007年   1493篇
  2006年   1286篇
  2005年   1205篇
  2004年   956篇
  2003年   851篇
  2002年   697篇
  2001年   426篇
  2000年   411篇
  1999年   342篇
  1998年   244篇
  1997年   241篇
  1996年   197篇
  1995年   145篇
  1994年   153篇
  1993年   160篇
  1992年   129篇
  1991年   147篇
  1990年   129篇
  1989年   141篇
  1988年   129篇
  1987年   102篇
  1986年   110篇
  1985年   93篇
  1984年   59篇
  1983年   53篇
  1982年   45篇
  1981年   58篇
  1980年   43篇
  1979年   61篇
  1978年   45篇
  1977年   47篇
  1975年   58篇
  1972年   39篇
  1971年   49篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
Neonatal back-transport. Cost-effectiveness   总被引:1,自引:0,他引:1  
This study examines the cost-effectiveness of returning previously ill neonates to community hospitals after treatment in a tertiary center, a concept known as "back-transport." The authors compared the charges for medical care during convalescence of a group of back-transported infants (BT infants; n = 20) with a similar group of infants who remained in a tertiary center for convalescence (NT infants; n = 20). The total charges for convalescent care (inpatient plus transport charges) for 20 representative BT infants was $61,840, compared with $68,240 for 20 matched NT infants, an average savings of $320 per BT infant. The average daily bed charge and charges for laboratory tests and medications were significantly less for BT infants compared with NT infants, and these reductions offset the transport charges for BT infants. The authors conclude that back transport decreases the charges for medical care for most infants. Therefore, the decision to back-transport an individual infant usually can be based on factors other than cost.  相似文献   
62.
Metabolic syndrome is a worldwide health problem, and obesity is closely related to type 2 diabetes, cardiovascular disease, hypertension, and cancer. According to WHO in 2018, the prevalence of obesity in 2016 tripled compared to 1975. D. morbifera reduces bad cholesterol and triglycerides levels in the blood and provides various antioxidant nutrients and germicidal sub-stances, as well as selenium, which helps to remove active oxygen. Moreover, D. morbifera is useful for treating cardiovascular diseases, hypertension, hyperlipidemia, and diabetes. Therefore, we study in vivo efficacy of D. morbifera to investigate the prevention effect of obesity and cholesterol. The weight and body fat were effectively reduced by D. morbifera water (DLW) extract administration to high-fat diet-fed C57BL/6 mice compared to those of control mice. The group treated with DLW 500 mg∙kg−1∙d−1 had significantly lower body weights compared to the control group. In addition, High-density lipoprotein (HDL) cholesterol increased in the group treated with DLW 500 mg∙kg−1∙d−1. The effect of DLW on the serum lipid profile could be helpful to prevent obesity. DLW suppresses lipid formation in adipocytes and decreases body fat. In conclusion, DLW can be applied to develop anti-obesity functional foods and other products to reduce body fat.  相似文献   
63.
64.
65.
International Urology and Nephrology - A systemic inflammation response index (SIRI) has been recently introduced as a tool for the assessment of the prognosis of several critical medical...  相似文献   
66.
67.
68.
69.
70.
Indwelling urethral catheter placement is a common and comparatively safe procedure. Misplacement of a urethral catheter into the upper urinary tract is unusual, and only a few cases have been reported. We describe the case of a 43-year-old man who presented with oliguria and had a history of chemotherapy for known metastatic lung cancer. As he had no history of urological disease, urethral catheterization was expected to be uneventful. The catheter was unable to be pulled back to the bladder neck once the balloon was inflated, and the patient expressed discomfort. Subsequent computed tomography revealed that the tip of the catheter was placed in the middle of the right ureter. Unbeknownst to the physicians before urethral catheterization, the patient had severe lower urinary tract symptoms and urinary bladder dysfunction with hydronephrosis, likely due to chemotherapy. Based on the patient’s symptoms and imaging results, we judged the possibility of severe ureteral injury to be low. The malpositioned catheter was removed uneventfully after complete balloon deflation and then reinserted properly. He was admitted to the medical department but died as a result of an exacerbation of the underlying disease unrelated to the incident. If urethral catheter placement seems abnormal, physicians should aspirate and irrigate to confirm correct positioning before balloon inflation; then, they should carefully pull the inflated balloon near the neck of the bladder while monitoring the patient’s symptoms. Although urethral catheter placement is comparatively safe, physicians must keep in mind that patients who have undergone chemotherapy might be at a risk for this rare complication.  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