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   4256篇
  免费   138篇
  国内免费   34篇
耳鼻咽喉   205篇
儿科学   244篇
妇产科学   148篇
基础医学   295篇
口腔科学   271篇
临床医学   310篇
内科学   829篇
皮肤病学   58篇
神经病学   266篇
特种医学   182篇
外科学   919篇
综合类   58篇
一般理论   1篇
预防医学   114篇
眼科学   154篇
药学   192篇
中国医学   38篇
肿瘤学   144篇
  2023年   23篇
  2022年   48篇
  2021年   63篇
  2020年   66篇
  2019年   75篇
  2018年   79篇
  2017年   71篇
  2016年   86篇
  2015年   107篇
  2014年   116篇
  2013年   185篇
  2012年   298篇
  2011年   282篇
  2010年   179篇
  2009年   178篇
  2008年   314篇
  2007年   339篇
  2006年   322篇
  2005年   326篇
  2004年   314篇
  2003年   301篇
  2002年   206篇
  2001年   88篇
  2000年   70篇
  1999年   43篇
  1998年   16篇
  1997年   15篇
  1996年   15篇
  1995年   11篇
  1994年   12篇
  1993年   7篇
  1992年   16篇
  1991年   22篇
  1990年   19篇
  1989年   9篇
  1988年   6篇
  1986年   9篇
  1985年   16篇
  1984年   11篇
  1983年   5篇
  1982年   4篇
  1981年   4篇
  1979年   3篇
  1977年   3篇
  1976年   3篇
  1974年   3篇
  1973年   6篇
  1972年   7篇
  1970年   4篇
  1968年   3篇
排序方式: 共有4428条查询结果,搜索用时 0 毫秒
1.
2.
Iron overload presenting as exacerbation of hepatic graft-versus-host disease (GVHD) after allogeneic hematopoietic stem cell transplantation has not been previously described. We report 6 patients with established hepatic GVHD in whom iron overload (median serum ferritin, 7231 mug/dL; median transferrin saturation, 77%) resulting from a lifetime median of 20 units of packed red blood cell transfusions was manifested by worsening of liver function. Liver biopsies performed in 4 patients confirmed severe iron overload and also hepatic GVHD. Analysis for the C282Y and H63D hemochromatosis gene mutation was negative for the homozygous state in all 6 patients. Erythropoietin-assisted phlebotomy resulted in normalization of liver function at a median of 7 months and of serum ferritin at a median of 11 months. Immunosuppressive therapy was successfully tapered in all 4 patients who completed the phlebotomy program, and this supported the impression that iron overload, rather than GVHD, was the principal cause of liver dysfunction. At a median follow-up of 50 months (range, 18-76 months) from the transplantation and 25 months (range, 5-36 months) from ferritin normalization, all 4 patients require maintenance phlebotomy. We conclude that iron overload can mimic GVHD exacerbation, thus resulting in unnecessary continuation or intensification of immunosuppressive therapy for GVHD, and that maintenance phlebotomy is necessary after successful iron-reduction therapy.  相似文献   
3.
The release of lithium carbonate incorporated into polymethylmethacrylate, poly vinyl chloride, hy-drogenated vegetable oil, and carbomer matrix tablets was studied in vitro. The formulation containing 10% carbomer showed a sustained-release profile comparable to that of a standard, commercially available, sustained-release preparation containing 400 mg lithium carbonate embedded in a composite material. In vivo the newly formulated and standard sustained-release lithium carbonate tablets were compared to an oral solution and conventional lithium carbonate tablets in 12 healthy subjects. These crossover studies showed that the sustained-release tablets produced a flatter serum concentration curve than the oral solution and conventional tablet, without loss of total bioavailability.  相似文献   
4.
The lumbrical muscles are located in the midpalm, dorsal to the palmar aponeurosis. The main function of these muscles is an indirect contribution to interphalangeal joint extension by decreasing the flexor effect of the flexor digitorum profundus muscle. Due to their minor biomechanical functions and suitable constructions, these muscles have been preferred in reconstructive surgery as local transposition flaps or pedicled flaps. Despite the surgical and clinical importance, vascular anatomical studies of these muscles are not well represented in the current literature. This study was performed in the Department of Anatomy of the Faculty of Medicine of the Ege University. Thirty-four cadaver hands, injected with red-coloured latex were used, and we aimed to describe the morphometry and vascular anatomy of the lumbrical muscles. We measured the length and width of the muscles, after removing their epimisium, and the diameter and length of the arteries to the muscles. The outcomes of our study determined that the length and width of the lumbrical muscles were reduced significantly from radial towards ulnar sides. The lumbrical muscles were supplied from both their palmar and dorsal surfaces by both superficial and deep palmar arches and/or their branches. We also described the level of entry of the dominant arteries for each lumbrical muscle and measured the size of the vessels and muscles to guide some surgical approaches. This anatomical study could guide for some surgical approaches and reduce the deficiency about the vascular anatomical patterns of the lumbrical muscles in the literature.  相似文献   
5.
6.
7.
Erythraea centaurium is a plant which is used in the treatment of various inflammatory conditions in popular medicine. The aqueous extract of the plant has been examined for its antiinflammatory, analgesic, and antipyretic effects in several animal models. The extract exhibited antiinflammatory and antipyretic activity although no analgesic activity was observed.  相似文献   
8.
BACKGROUND CONTEXT: Intraradicular lumbar disc herniation is rare, having been reported to date in only three postoperative patients. The diagnosis is typically made intraoperatively. PURPOSE: To report a fourth case of intraradicular disc herniation, to emphasize its radiological characteristics and operative findings. STUDY DESIGN: Case report. PATIENT SAMPLE: A 41-year-old female. METHODS: Retrospective case review. RESULTS: The patient underwent a second operation and intraradicular disc fragment was removed. She was completely well at her 9-month check up. CONCLUSIONS: The diagnosis, mechanism, and surgical treatment of intraradicular lumbar disc herniation are reviewed. The round shape of the sequestrated fragment, as seen on magnetic resonance imaging, may help to establish the correct diagnosis.  相似文献   
9.
Dydrogesterone, similar to women's natural progesterone, has been used in a wide range of gynecological conditions. Despite its widespread use, dydrogesterone-induced hepatotoxicity and dydrogesterone-induced hemolytic anemia have, to the best of our knowledge, never been reported previously. We describe a case of hepatitis and warm antibody hemolytic anemia due to dydrogesterone.  相似文献   
10.
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