首页 | 官方网站   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   145334篇
  免费   10130篇
  国内免费   3571篇
医药卫生   159035篇
  2022年   1274篇
  2021年   2555篇
  2020年   1901篇
  2019年   1986篇
  2018年   2697篇
  2017年   2245篇
  2016年   2107篇
  2015年   2917篇
  2014年   3729篇
  2013年   4348篇
  2012年   6021篇
  2011年   6480篇
  2010年   4254篇
  2009年   3699篇
  2008年   5108篇
  2007年   5181篇
  2006年   4974篇
  2005年   4303篇
  2004年   3756篇
  2003年   3508篇
  2002年   3149篇
  2001年   7126篇
  2000年   7237篇
  1999年   5905篇
  1998年   1947篇
  1997年   1494篇
  1996年   1036篇
  1995年   951篇
  1992年   3773篇
  1991年   3845篇
  1990年   3572篇
  1989年   3588篇
  1988年   3451篇
  1987年   3296篇
  1986年   3107篇
  1985年   2983篇
  1984年   2067篇
  1983年   1793篇
  1982年   984篇
  1979年   1911篇
  1978年   1185篇
  1977年   984篇
  1975年   1190篇
  1974年   1356篇
  1973年   1412篇
  1972年   1355篇
  1971年   1243篇
  1970年   1134篇
  1969年   1113篇
  1968年   1022篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
994.
995.
The lymph flow of the thoracic duct, the protein content of the lymph, bile flow and bile composition are studied during the first three hours of the recirculation phase in experimental liver transplantation. It is established that the lymph flow and the protein content of the thoracic duct decrease as a result of the interruption of hepatic lymph flow of a high protein concentration. The change in bile composition and flow is due to the reduced bile acid excretion of the transplanted hepatic tissue.  相似文献   
996.
Z G Wang 《中华外科杂志》1989,27(1):22-4, 61
One-hundred cases of Budd-Chiari syndrome were treated from December 1982 to March 1988. There were 62 males and 38 females. Their ages ranged from 15 to 62 years averaged 32.6 years Seventy-six cases had intractable ascites, 56 had esophageal varices and 22 had upper gastrointestinal bleeding. There were 37 cases with membranous obstruction, 57 with occlusion of the inferior vena cava above the confluence of the hepatic veins and 6 with occlusion of hepatic veins. Eighty-one cases (81%) were operated upon. Operative mortality was 8.6% (7/81). Follow-up from 2 to 63 months revealed that 60 operated cases (74.1%) had good results, while 11 of 19 (58%) patients treated conservatively died within two months after admission. It is concluded that the operative procedure must be tailored to the etiology and pathology. The mesoatrial shunt is the operation of choice for occlusion of the retrohepatic IVC and hepatic veins, the cava-atrial shunt for occlusion of the IVC and patent hepatic veins, membranotomy for IVC web, and the meso-caval shunt for intrahepatic venous occlusion. For those who also have superior vena cava compression syndrome, an innominate-atrial shunt should be added.  相似文献   
997.
998.
Zinc is closely related to children's health and growth.' We selected 120 children with low serum zinc. Adopting random double-blind method, we treated two groups of children,. 60 each, with sulphate zinc syrup and licorice acid zinc capsules respectively.  相似文献   
999.
Lung cancer and prior tuberculosis infection in Shanghai   总被引:1,自引:0,他引:1  
In a population-based case-control study of lung cancer in Shanghai involving interviews during 1984-86 with 1,405 cancer patients and 1,495 controls, a significant 50% elevation in the risk of lung cancer, adjusted for cigarette smoking, was observed among persons who had a history of tuberculosis. Among those diagnosed with tuberculosis within the past 20 years, the risk exceeded 2.5-fold. In males the lung cancers tended to occur on the same side as the previous tuberculosis infection. For both sexes, the effect of recent tuberculosis was most apparent for adenocarcinoma and peripheral tumours. No relationship was found between lung cancer risk and the type of tuberculosis therapy, including use of isoniazid. The findings suggest that tuberculosis may predispose to lung cancer, with the association most apparent among recent survivors of the infection.  相似文献   
1000.
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-23

京公网安备 11010802026262号