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   378160篇
  免费   24836篇
  国内免费   2803篇
耳鼻咽喉   5183篇
儿科学   8201篇
妇产科学   10080篇
基础医学   53076篇
口腔科学   11774篇
临床医学   30079篇
内科学   78228篇
皮肤病学   8546篇
神经病学   27185篇
特种医学   13908篇
外国民族医学   82篇
外科学   60544篇
综合类   9953篇
现状与发展   1篇
一般理论   64篇
预防医学   17416篇
眼科学   9440篇
药学   30959篇
  1篇
中国医学   2193篇
肿瘤学   28886篇
  2021年   2601篇
  2019年   2717篇
  2018年   4512篇
  2017年   3428篇
  2016年   3516篇
  2015年   4015篇
  2014年   5687篇
  2013年   7367篇
  2012年   10001篇
  2011年   10184篇
  2010年   6179篇
  2009年   5833篇
  2008年   9435篇
  2007年   10266篇
  2006年   10192篇
  2005年   9251篇
  2004年   8762篇
  2003年   8500篇
  2002年   8176篇
  2001年   28267篇
  2000年   28779篇
  1999年   23660篇
  1998年   5158篇
  1997年   4247篇
  1996年   3827篇
  1995年   3477篇
  1994年   3103篇
  1993年   2841篇
  1992年   16046篇
  1991年   14809篇
  1990年   14153篇
  1989年   13958篇
  1988年   12579篇
  1987年   12059篇
  1986年   11101篇
  1985年   10320篇
  1984年   6911篇
  1983年   5599篇
  1982年   2718篇
  1979年   5477篇
  1978年   3347篇
  1977年   2971篇
  1975年   2641篇
  1974年   3064篇
  1973年   2865篇
  1972年   2828篇
  1971年   2773篇
  1970年   2510篇
  1969年   2543篇
  1968年   2250篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
861.
Two neonates who went into acute hypovolaemic shock due to a tight nuchal cord were successfully resuscitated. The occurrence of this life threatening complication in two low risk pregnancies emphasises the importance of having staff trained in resuscitation immediately available in the delivery unit.  相似文献   
862.
The aim of this study was to investigate the value of elemental diet in steroid-resistant and steroid-dependent Crohn's disease. Elemental diet (Vivonex HN, 39.4 +/- 9.2 kcal/kg/d) was delivered through a nasogastric tube at a constant rate. Twenty therapeutic periods lasting from 20 to 74 days (median, 32 days) were undertaken in 18 patients. Elemental diet was well tolerated. Mean values of hemoglobin, serum albumin, and serum transferrin increased significantly through the therapeutic period; body weight and anthropometric data did not change significantly. The short-term response to elemental diet was excellent in 11 cases, demonstrated by achievement of clinical remission and steroid withdrawal; six patients had an incomplete remission and remained slightly active or had to be maintained under low dose steroids; three patients did not respond to therapy and had to be operated upon. During the follow-up (6-30 months), 8 patients out of 17 had a relapse. Relapse was controlled by medical therapy in 5 cases and led to surgery in the 3 other cases. We conclude that elemental diet, as total parenteral nutrition, is an effective therapy of steroid-resistant and steroid-dependent Crohn's disease. However, elemental diet does not prevent relapse.  相似文献   
863.
864.
865.
To determine the clinical significance of regional left ventricular asynergy in patients with impending myocardial infarction, we recorded two-dimensional echocardiograms (2DE) serially and performed coronary angiography immediately after the hospital admission in nine patients with initial impending infarction and their last anginal attacks were within 48 hours. Left ventricular asynergy on the first 2DE was observed in six of nine patients during symptom-free periods (Group A: LV asynergy group). Five of the six patients had significant coronary artery lesions (greater than or equal to 75% stenosis) in at least one major coronary artery. Intracoronary filling defects were detected in four of the five patients. Another three patients without asynergy (Group B) had significant fixed stenosis. Coronary artery spasm was observed in two patients during coronary angiography, but no patient had intracoronary filling defects. Intracoronary nitroglycerin (0.1-0.3 mg) reduced the severity of coronary artery narrowing in two patients. In addition, urokinase (240,000-480,000 IU) via the corresponding vessel (PTCR) in the remaining seven patients resulted in reduction in the severity of coronary artery stenosis in four patients, but not in the remaining three patients. Left ventricular wall movement in the asynergy group improved rapidly and no asynergy was observed by the seventh hospital day in five of the six patients. Successful PTCR treatment resulted in improvement of left ventricular wall movement. No asynergy was found in the non-asynergy group throughout their hospitalizations. These findings indicated that abnormal left ventricular wall movement is found in patients with impending myocardial infarction, even during symptom-free periods, but the wall movement gradually improves. The 2DE observations are useful for estimating the clinical status and for planning precise therapy for impending myocardial infarction.  相似文献   
866.
867.
Synovial sarcoma of the hand—A literature study   总被引:1,自引:0,他引:1  
Ninety cases of synovial sarcoma of the hand, including eight case reports have been described during the last fifty years, (1934-1984). 8.5% of all synovial sarcomata involve the hand, and affect predominantly individuals under the age of thirty. The five-year survival of these cases was 18% and the ten-year survival 9%.  相似文献   
868.
Chemotaxis, chemokinesis and cellular orientation were measured for unstimulated and 10(-7) n-formyl methionyl leucyl phenylalanine (F-met-leu-phe) stimulated polymorphonuclear leucocytes (PMNS) of nine patients with recent 10-80 per cent burns using a computer-assisted image analysis technique. The technique records PMN movement, as viewed with a phase-contrast microscope on videotapes, and then uses computer programs to calculate the speed and direction of up to 50 PMNS over a 5-min period. Orientation was determined visually. Cellular adherence was also measured by attachment methods. PMNS from burn patients were slower (av. speed 16.8 microns/min), responded less well to F-met-leu-phe (av. speed 20.9 microns/min, av. McCutcheon index 0.32), were less often oriented towards the chemoattractant (av. 39 per cent) and were more adherent (av. 50 per cent) than control cells (av. speed 21.8 microns/min; av. speed F-met-leu-phe 32.2 microns/min; McCutcheon index 0.61; oriented 59 per cent adherent; 16 per cent). Thus PMNS from burn patients orient less well, are significantly slower and have less directionality in response to a chemoattractant, and are more adherent suggesting activation.  相似文献   
869.
870.
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