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   687000篇
  免费   36794篇
  国内免费   1045篇
耳鼻咽喉   9405篇
儿科学   23431篇
妇产科学   18927篇
基础医学   107378篇
口腔科学   19618篇
临床医学   57385篇
内科学   124624篇
皮肤病学   16090篇
神经病学   46844篇
特种医学   28249篇
外国民族医学   160篇
外科学   102673篇
综合类   9503篇
一般理论   119篇
预防医学   53149篇
眼科学   16037篇
药学   52700篇
  2篇
中国医学   1139篇
肿瘤学   37406篇
  2018年   8299篇
  2017年   7388篇
  2016年   7099篇
  2015年   9141篇
  2014年   10121篇
  2013年   12696篇
  2012年   22155篇
  2011年   18584篇
  2010年   10309篇
  2009年   11409篇
  2008年   15506篇
  2007年   17175篇
  2006年   17687篇
  2005年   25031篇
  2004年   26203篇
  2003年   21233篇
  2002年   16451篇
  2001年   27828篇
  2000年   26573篇
  1999年   25587篇
  1998年   5884篇
  1997年   4927篇
  1996年   5351篇
  1995年   4959篇
  1992年   21587篇
  1991年   22268篇
  1990年   22547篇
  1989年   21620篇
  1988年   20064篇
  1987年   19685篇
  1986年   18603篇
  1985年   17427篇
  1984年   12633篇
  1983年   10714篇
  1982年   5417篇
  1981年   4878篇
  1979年   12655篇
  1978年   8854篇
  1977年   7305篇
  1976年   6873篇
  1975年   8487篇
  1974年   10258篇
  1973年   9455篇
  1972年   9283篇
  1971年   9010篇
  1970年   8307篇
  1969年   7939篇
  1968年   7454篇
  1967年   6805篇
  1966年   6058篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
Carpal osteolysis: an unusual entity treated by renal transplantation   总被引:1,自引:0,他引:1  
P Ros  E Pelaez  N Gallego  J Corbatón  J Ortu?o 《Nephron》1990,55(4):434-435
  相似文献   
992.
The surgeon has to keep abreast of changing advantages and disadvantages as well as alternatives in the context of homologous blood transfusions. We ought to realise that normovolaemic anaemia is better tolerated than we used to assume in the past. It is no longer necessary to provide transfusions to patients with 10 g/% Hb. About 8 g/% should rather be considered the adequate threshold. Possible transmission of hepatitis and AIDS virus is a genuine risk associated with blood transfusion. No hard evidence has yet been produced to immunosuppression and effects on the prognosis of cancer patients. More attention will have to be given in the future to preoperative supply of blood for autohaemotherapy.  相似文献   
993.
The principles of treatment of tibial pseudoarthroses complicated by skin and soft tissue loss with the use of cancellous bone grafts from posterolateral approach to the tibia by Harmon method were discussed. The detailed surgical technique was presented. Management of 3 patients that resulted in bone union was described.  相似文献   
994.
This article is an account of the activities undertaken by the WHO Regional Office for the Eastern Mediterranean in relation to reporting on monitoring and evaluation of progress in the implementation of the strategy for health for all by the year 2000, and the resulting effect on improving coverage and the quality of data. Tables 1-3 compare the completeness of items in the Eastern Mediterranean Region's reports on the three cycles (1983, 1985 and 1988) to that for other regions and for the global level. The comparison is based on the respective global reports presented to the World Health Assembly.  相似文献   
995.
996.
This study demonstrates by a virologic culture method that human immunodeficiency virus (HIV) resides in bone. After freezing, some initially positive specimens no longer yielded virus, but those that continued to yield virus were not further altered by subsequent washing, which removed essentially all marrow, or by freeze-drying. The safeguards against potential transmission of HIV by a bone allograft are principally the screening and testing methods previously described, although there may be a further reduction of the remote residual risk by the freezing step in the usual technical sequence for tissue banking by sterile techniques.  相似文献   
997.
The authors use injections of botulinum A toxin in treatment of facial spasms. 105 patients (70 patients with blepharospasm, 35 patients with hemispasm) were treated during 4 years. The toxin Wisconsin relieved spasms for an average of 10 weeks. Local complications such as ptosis and diplopia appeared in less than 1/5 of the cases. No general complications were observed. Repeated treatments are necessary. The authors noted a decrease of lacrimal secretion on the treated side in hemifacial spasm and concluded that botulinum A toxin injections could be used as a treatment of epiphora.  相似文献   
998.
Ceruletide, a potent analogue of cholecystokinin, was administered by injection to eight schizophrenics treated with neuroleptics. We examined the dose–response effect on microvibration (MV) recorded from the chin of these patients. After 15 min of bed rest, MV was recorded for 5 min as a control recording. Subsequently, saline or ceruletide, at a dose of either 0.4 m?g/kg or at 0.8 m?g/kg, was injected according to a Latin square design with an interval of 4 weeks for washing out the drug effect and MV was recorded for 30 min. MV data obtained were subjected to the fast Fourier transform and an average power spectrum was computed. A three-way analysis of variance for these data was performed upon dose-effect, time-effect after treatment, and band-effect of the average power spectrum. The present results were similar to previous findings which had revealed effects of ceruletide on tardive dyskinesia symptoms, namely, the effects of ceruletide on MV were different according to the subjects (three cases: facilitation followed by inhibition, three cases: inhibition, two cases: no effects). The dose-response curve of ceruletide appears to be linear in some cases and an inverted U-shape in other cases. Present findings showed small doses of systemically administered ceruletide would modify muscle tonus of schizophrenics under chronic treatment of neuroleptics, and provided further reason for the therapeutic drug of tardive dyskinesia.  相似文献   
999.
Abstract: Breast conservation surgery is an effective and safe treatment for many breast carcinomas. It may be possible to further limit the extent of resection (or expand the indication for breast conservation) by the application of preoperative chemotherapy and radiotherapy. We explored the feasibility of this in a pilot study.
Seventy-three patients (mean age 48, 63% premenopausal) with confirmed breast cancer, less than 2.5 cm, received chemotherapy (Group A) or chemotherapy plus radiotherapy (Group B) prior to limited resection (tumorectomy). Axillary dissection was always performed. Results: In 6/31 (19%) Group A and 17/42 (40%) Group B patients the tumor was not palpable after preoperative treatment, with complete pathological remission in 1 and 3 cases respectively. Histologic grading, mitosis, cellular alteration, and cellularity evaluations indicated a consistently greater therapeutic effect with chemoradiotherapy than with chemotherapy alone.
In conclusion, radiotherapy appears useful in the preoperative treatment of breast cancer and its use in association with various drug combinations should be further explored.  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