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   729648篇
  免费   49108篇
  国内免费   1303篇
耳鼻咽喉   9392篇
儿科学   24604篇
妇产科学   18060篇
基础医学   114264篇
口腔科学   20044篇
临床医学   64991篇
内科学   138029篇
皮肤病学   16424篇
神经病学   51434篇
特种医学   27842篇
外国民族医学   76篇
外科学   108872篇
综合类   14924篇
现状与发展   2篇
一般理论   160篇
预防医学   52869篇
眼科学   16707篇
药学   55427篇
  3篇
中国医学   2360篇
肿瘤学   43575篇
  2019年   5432篇
  2018年   9422篇
  2017年   7859篇
  2016年   7913篇
  2015年   8065篇
  2014年   10437篇
  2013年   15492篇
  2012年   22020篇
  2011年   22193篇
  2010年   12777篇
  2009年   12143篇
  2008年   20101篇
  2007年   21614篇
  2006年   22103篇
  2005年   25050篇
  2004年   26598篇
  2003年   23244篇
  2002年   18745篇
  2001年   36366篇
  2000年   36905篇
  1999年   30379篇
  1998年   7875篇
  1997年   6663篇
  1996年   6970篇
  1995年   6627篇
  1994年   6099篇
  1993年   5590篇
  1992年   22969篇
  1991年   22927篇
  1990年   22311篇
  1989年   22076篇
  1988年   20043篇
  1987年   19420篇
  1986年   18471篇
  1985年   17309篇
  1984年   12697篇
  1983年   10747篇
  1982年   5922篇
  1979年   11520篇
  1978年   8129篇
  1977年   6833篇
  1976年   6595篇
  1975年   7274篇
  1974年   8499篇
  1973年   8143篇
  1972年   7660篇
  1971年   7128篇
  1970年   6879篇
  1969年   6307篇
  1968年   5782篇
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
991.
Addition of immunomodulating therapy with Thymalin, a thymus agent, to the multimodality therapy of burnt patients contributes to a rapid normalization of immunological parameters. The most marked immune response was observed 7-10 days after a therapy course initiated in the early periods of burn disease in patients with severely depressed T-system immunity and a high sensitivity to the drug. Inclusion of a donor blood leukomass transfusion course activates the cellular link of the immune system just after the treatment course, but fails to favour a stable normalization of thymus-dependent lymphocyte ratios.  相似文献   
992.
The frequency of the development of rejection crises in the early postoperative period in 32 recipients of allogeneic kidneys from alive related donors was analysed depending on the histocompatibility according to the antigens of the HLA-AB system and the nature of the immunosuppressant therapy. The results of the analysis showed that the frequency of rejection crises was 100% when the donor and recipient were compatible in 1-2 antigens, and 40% in compatibility according to 3-4 antigens. The incidence of rejection crises was 71.4% among patients who received the standard immunosuppressant therapy (corticosteroids + azathioprine) and 36% among those given also sandimmune. Analysis of the frequency of rejection crises according to the ABO blood group system to which the donor-recipient pair occurred, showed that rejection crises occurred most frequently among patients with A (II) blood group.  相似文献   
993.
994.
In thrombosis of the aorta and major arteries (52 cases), postthrombotic occlusion (26), arterial embolism (14), the ultrasound vascular scanning++ was performed. The method permits to define the presence and location of arterial occlusion, differentiate thrombosis and embolism, atherosclerotic and autoimmune diseases of the vessels and as well to assess the outcome of restorative and reconstructive operations in acute arterial obstruction.  相似文献   
995.
A comparison of the results of 169 cholecystectomies with the use of a laser scalpel and 160--conventional methods was carried out. The CO2-laser was used for exposure of the gallbladder and coagulation of tissue of the liver in the region of its bed. Hemo- and cholestasis in all the cases was reliable, and due to this fact in 27% of the patients, the subhepatic recess was not drained. The incidence of complications after the elective cholecystectomy reduced by 11%, after the emergency one--by 9%, the lethality reduced considerably.  相似文献   
996.
After surgical treatment of 664 patients with postoperative abdominal hernias (PAH) within the period of from 1972 to 1983, the incidence of recurrences was 48.4%. On the basis of studying microcirculation at the area of hernioplasty and its dependence on tissue tension force in the experiment on animals and at operations by means of radiometry, rheometry and fluorimetric analysis, the technique for surgical treatment of PAH with regard to location of a defect, including the method of plasty, system of preoperative preparation and prophylaxis of the postoperative wound complications, has been developed. From 1984, 200 patients with PAH were operated on, the incidence of recurrences decreased to 2.4%.  相似文献   
997.
Several underlying metabolic abnormalities may be present in patients with recurrent calcium calculus disease (RCCD). The aim of this study was to determine the prevalence of deficiencies of 2 well-known potent inhibitors of crystal formation and growth, citrate and pyrophosphate, in the various metabolic subgroups and as single defects. In 107 patients with RCCD, urinary citrate was significantly decreased in all metabolic subgroups with 49% of patients having hypocitraturia (2.53 +/- 1.19 mmol/24 h) versus controls (3.44 +/- 0.96 mmol/24 h; p less than 0.001). Reduced pyrophosphate:creatinine ratios were present in all the patient subgroups, and 48% of all patients had reduced ratios (1.68 +/- 1.68 vs. 3.10 +/- 2.66 in controls; p less than 0.01). There was no correlation between citrate and pyrophosphate concentration. Isolated hypocitraturia was found in 11.2%, reduced pyrophosphate:creatinine ratios as the single defect in 11.2% and a combination of both in 12.1% of patients. Thus inhibitor defects play an important role in patients with RCCD and frequently occur as isolated biochemical defects.  相似文献   
998.
999.
The article presents results of treatment of 21 patients with a surgical pathology and diabetes mellitus who had intraportal allotransplantation of cultures of islet cells of the pancreas and 316 patients with the similar surgical pathology without such transplantation. It was found that the intraportal introduction of islet cell cultures into the liver can result in an early and considerable drop of the injected insulin dose which is very important in the postoperative period. This method allowed to make the period of treatment at the hospital approximately 15 days shorter.  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