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   32569篇
  免费   1613篇
  国内免费   186篇
耳鼻咽喉   193篇
儿科学   477篇
妇产科学   430篇
基础医学   3846篇
口腔科学   743篇
临床医学   2074篇
内科学   8481篇
皮肤病学   552篇
神经病学   2361篇
特种医学   1608篇
外科学   5997篇
综合类   176篇
一般理论   1篇
预防医学   976篇
眼科学   613篇
药学   2299篇
  4篇
中国医学   64篇
肿瘤学   3473篇
  2023年   187篇
  2022年   371篇
  2021年   645篇
  2020年   358篇
  2019年   467篇
  2018年   602篇
  2017年   474篇
  2016年   605篇
  2015年   621篇
  2014年   761篇
  2013年   956篇
  2012年   1590篇
  2011年   1803篇
  2010年   987篇
  2009年   891篇
  2008年   1589篇
  2007年   1864篇
  2006年   1827篇
  2005年   1784篇
  2004年   1756篇
  2003年   1650篇
  2002年   1638篇
  2001年   1022篇
  2000年   988篇
  1999年   905篇
  1998年   478篇
  1997年   372篇
  1996年   364篇
  1995年   281篇
  1994年   242篇
  1993年   239篇
  1992年   592篇
  1991年   530篇
  1990年   531篇
  1989年   503篇
  1988年   450篇
  1987年   436篇
  1986年   430篇
  1985年   402篇
  1984年   249篇
  1983年   200篇
  1982年   107篇
  1979年   187篇
  1978年   118篇
  1977年   108篇
  1975年   92篇
  1973年   99篇
  1972年   93篇
  1970年   110篇
  1969年   93篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Intralobar pulmonary sequestration associated with asymptomatic aspergillosis is a rare case. We describe the case of a 65-year-old woman with intrapulmonary sequestration, anomalous systemic arterial supply to the left lower lobe and aspergillosis who underwent left lower lobectomy and ligation of an anomalous artery by Video-Assisted Thoracoscopic surgery (VATS). Pathological examination showed the parenchymal distortion and chronic inflammation. Aspergillus were found in the cyst. VATS lobectomy for intralobar pulmonary sequestration is a safe and valid procedure.  相似文献   
52.
53.
54.
55.
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   
56.
57.
We report two cases of unilateral renal angiomyolipoma. In both cases, our preoperative diagnosis was renal cell carcinoma because no low density area compatible with a fatty tissue was noted in the tumors. Histological examination revealed both tumors to be angiomyolipoma mainly composed of myomatous cells and immature fat cells.  相似文献   
58.
We describe a case of a large bronchial fistula and empyema after right upper lobectomy that was treated successfully with open window thoracostomy followed by a latissimus dorsi myocutaneous flap and limited thoracoplasty. A latissimus dorsi myocutaneous flap can provide immediate airtight closure of a large bronchial fistula, allowing lavage and curettage of the empyema cavity to reduce the chance of postoperative infection. An important aspect of this technique is that the deepithelialized skin side rather than muscle is sutured to an opening of the bronchus. As compared with other techniques, a latissimus dorsi myocutaneous flap is superior in that it requires a single incision and does not require an intraop-erative change of position. In addition, the technique causes little dysfunction of the chest and shoulder and preserves the vascular supply to ensure the viability of the flap even if it was divided in a previous operation.  相似文献   
59.
60.
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