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   997583篇
  免费   75244篇
  国内免费   2617篇
耳鼻咽喉   12961篇
儿科学   34467篇
妇产科学   28472篇
基础医学   145301篇
口腔科学   27723篇
临床医学   90279篇
内科学   193577篇
皮肤病学   22922篇
神经病学   79137篇
特种医学   38395篇
外国民族医学   305篇
外科学   149497篇
综合类   23739篇
一般理论   385篇
预防医学   77823篇
眼科学   22614篇
药学   71871篇
  3篇
中国医学   2031篇
肿瘤学   53942篇
  2018年   10559篇
  2017年   8239篇
  2016年   9376篇
  2015年   10599篇
  2014年   14425篇
  2013年   22007篇
  2012年   28989篇
  2011年   30831篇
  2010年   18494篇
  2009年   17439篇
  2008年   28798篇
  2007年   30474篇
  2006年   30965篇
  2005年   29646篇
  2004年   28934篇
  2003年   27805篇
  2002年   26816篇
  2001年   46932篇
  2000年   48038篇
  1999年   40265篇
  1998年   11180篇
  1997年   10096篇
  1996年   10163篇
  1995年   9775篇
  1994年   9093篇
  1993年   8480篇
  1992年   32251篇
  1991年   31460篇
  1990年   31010篇
  1989年   29876篇
  1988年   27168篇
  1987年   27329篇
  1986年   25437篇
  1985年   24602篇
  1984年   18399篇
  1983年   15519篇
  1982年   9288篇
  1981年   8376篇
  1979年   16860篇
  1978年   12221篇
  1977年   10315篇
  1976年   9756篇
  1975年   10178篇
  1974年   12318篇
  1973年   11845篇
  1972年   10885篇
  1971年   10113篇
  1970年   9375篇
  1969年   8726篇
  1968年   8104篇
排序方式: 共有10000条查询结果,搜索用时 10 毫秒
91.
Background: The study reviews the anticancer properties of naturalisoflavones which occur in especially high concentration in soybeans. Itconsiders the suitability of soybean products for clinical trials aiming toreduce the progression of breast cancer.Methods: Evidence is reviewed that plant isoflavones such asgenistein show cytostatic activity against human mammary cancer cell linesin vitro and can also suppress carcinogen-induced mammary cancer inyoung and mature rats.Results: Plant isoflavones are converted in the bowel to compoundswith potential antioestrogenic and antioxidative properties. These compoundsshow cytostatic activity for both oestrogen receptor-positive and negativehuman mammary cancer cell lines, and also inhibit growth and progress of therat mammary cancer model. The high content of soybean products in the diet ofAsian women has been postulated as one reason for their relatively low breastcancer incidence.Conclusion: Preclinical studies suggest that soybean products begiven priority for clinical trials in breast cancer protection. A pilot studycould test soy protein supplements as long-term adjuvant dietary treatmentafter primary surgery for early breast cancer, looking for a decrease in therisk of recurrence or of second primary tumours.  相似文献   
92.
93.
The objectives of this study were to investigate (1) changes in consumption of alcohol among pregnant women over a period of 5 years (1984/85–1990), (2) changes of attitudes towards drinking during pregnancy in the general population over the same period of time, and (3) possible connections between (1) and (2). The investigation was designed as a cross-sectional study. Our subjects were two representative samples of pregnant women in Oslo, n = 577 and 425, and two representative samples of the Norwegian population, n = 1004 and 1204. The main outcome measures were a self-completed questionnaire for the pregnant women and a personal interview for the general population sample. There was a significant reduction (50% decrease) in alcohol consumption among the second cohort of pregnant women compared with the first. Furthermore, we found an increase during the 5-year period in the number of persons with a restrictive attitude towards alcohol use during pregnancy. There seems to be a connection between these two phenomena, but with our present state of knowledge it is hard to say anything about the causal relationship between them.  相似文献   
94.
Corpus cavernosography in a patient with erectile dysfunction revealed absence of communication between the 2 cavernous bodies. No similar case was found in a review of 100 consecutive cavernosograms or in the literature. The abnormality may be a source of error in pressure recordings or in intravenous injection of pharmaceutical agents.  相似文献   
95.
96.
97.
The urological complications of 320 consecutive renal transplants performed at our institution between October 17, 1985 and November 10, 1989 are reviewed. The Leadbetter-Politano technique of ureteroneocystostomy was used in the first 160 patients (group 1) and an anterior extravesical technique modified from the methods of Witzel, Sampson and Lich was performed in the second 160 patients (group 2). Urological complications occurred in 15 patients (9.4%) in group 1 and 6 (3.7%) in group 2 (p = 0.04). Ureterovesical junction obstruction occurred in 6 patients (3.7%) in group 1 and 1 (0.6%) in group 2 (p = 0.05). Complications of leakage, ureteral necrosis and ureteral stricture were comparable in the 2 groups. Therefore, we advocate the use of the anterior extravesical technique over Leadbetter-Politano ureteral reimplantation based on the lower incidence of urological complications and various technical advantages, including less operative time, avoidance of a separate cystotomy, less hematuria and ability to use short donor ureters.  相似文献   
98.
99.
Preservation of the breast with a good or excellent cosmetic appearance is achievable in most patients. Careful attention to the details of surgical technique allows these procedures to be carried out easily and comfortably for the patient and the surgeon alike.  相似文献   
100.
A retrospective analysis of results of treatment of 104 patients with fractures of long tubular bones associated with injuries of peripheral nerves has shown complex therapy to be necessary. Main components of this treatment were biogenic stimulators, vitamin B12, spasmolytic and dehydration drugs in combination with electrophoresis with potassium iodide and thermal procedures. Rapid disturbance of conductivity of nerve trunks after trauma should be followed by revision of the given segment of the extremity in order to remove hematoma and make reposition of displaced fragments of the bone, which can provide recovery of the disturbed function of the nerve.  相似文献   
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