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   3253篇
  免费   260篇
  国内免费   15篇
耳鼻咽喉   57篇
儿科学   100篇
妇产科学   115篇
基础医学   413篇
口腔科学   155篇
临床医学   306篇
内科学   595篇
皮肤病学   81篇
神经病学   161篇
特种医学   173篇
外国民族医学   5篇
外科学   349篇
综合类   88篇
一般理论   1篇
预防医学   276篇
眼科学   79篇
药学   350篇
中国医学   19篇
肿瘤学   205篇
  2023年   36篇
  2022年   137篇
  2021年   229篇
  2020年   129篇
  2019年   153篇
  2018年   222篇
  2017年   120篇
  2016年   125篇
  2015年   124篇
  2014年   152篇
  2013年   220篇
  2012年   252篇
  2011年   243篇
  2010年   157篇
  2009年   97篇
  2008年   130篇
  2007年   114篇
  2006年   117篇
  2005年   130篇
  2004年   105篇
  2003年   80篇
  2002年   73篇
  2001年   31篇
  2000年   31篇
  1999年   45篇
  1998年   13篇
  1997年   12篇
  1996年   9篇
  1995年   7篇
  1994年   8篇
  1992年   10篇
  1991年   27篇
  1990年   21篇
  1989年   23篇
  1988年   24篇
  1987年   13篇
  1986年   14篇
  1985年   7篇
  1984年   9篇
  1983年   12篇
  1981年   4篇
  1980年   3篇
  1979年   8篇
  1978年   9篇
  1977年   3篇
  1975年   10篇
  1974年   3篇
  1973年   5篇
  1972年   5篇
  1971年   5篇
排序方式: 共有3528条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
Summary Eight patients with malignant gliomas verified on CT scan, received an intravenous injection of 50 mg of Adriamycin R, 24 hours prior to surgical removal of the tumour. Peroperatively, both tumour and surrounding tissue specimens were obtained for determination of the tissue concentrations of Adriamycin and its reduced metabolite Adriamycinol. It was found that Adriamycin could be detected in tumour tissue from all patients. The concentration varied between 0,9 and 4,6 nmol/g tissue. In contrast, Adriamycin could only be detected in surrounding brain tissue from one patient.In anin vitro study a human malignant glioma cell line (U-251 MG) was exposed to various concentrations of Adriamycin for 24 hours. It was found that an intracellular drug concentration above 30 nmol/g cells caused a concentration dependent inhibition of cell growth. Thus, it is likely that the poor effect of Adriamycin on patients with malignant gliomas is due to an ineffective drug accumulation in the tumour tissue.  相似文献   
5.
A case of a pedunculated arachnoid cyst within the third ventricle is presented. The cyst was small so as not to appear as a significant expanding lesion on CT. The clinical history, however, suggested intermittent increase of the intracranial pressure. On CT there was some widening of the lateral and third ventricles, while the fourth ventricle had normal width. This finding in combination with the clinical history prompted further neuroradiologic examinations, including pneumoencephalography and ventriculography. The presence of a pedunculated mobile cystic lesion within the third ventricle was shown and its nature further elucidated by stereotactic puncture combined with contrast injection into the cyst. After emptying of the cyst, the patient has been free of symptoms during an observation time of 2 years. The diagnostic and differential diagnostic aspects are discussed and the value of traditional neuroradiologic methods emphasized.  相似文献   
6.
Perianal mucinous adenocarcinoma is a rare tumour which may be associated with long‐standing chronic perianal sepsis. Early diagnosis is challenging and is based on a high index of clinical suspicion and specific histological features. Definitive treatment is surgical, in the form of an abdomino‐perineal resection. We hereby describe a case of a perianal mucinous adenocarcinoma arising from long‐standing recurrent perianal fistula and complement this with a brief review of the literature pertaining in particular to the management of this condition.  相似文献   
7.
Conference Reports: This section contains reports on topical conferences. Reports are usually written at the request of the editorial office, but unsolicited contributions are also welcome. Suggestions should be sent to the editorial office of the Macromolecular journals, preferably by E‐mail to macromol@wiley‐vch.de.  相似文献   
8.
9.
10.
OBJECTIVES: To present a series of women with recurrent molar pregnancies, including rare familial cases, and discuss etiology and treatment options. METHODS: We performed a detailed clinical evaluation and pedigree analysis of five Egyptian women with recurrent pregnancy loss due to molar pregnancy. RESULTS: The women had a history of four to nine consecutive hydatidiform moles but of no viable pregnancies. Two of the women had molar pregnancies with different husbands who themselves had viable offspring from previous wives; and three of them, who belonged to a family with extensive intermarriage, had a pedigree consistent with an autosomal recessive maternal-effect mutation. CONCLUSIONS: Recurrent pregnancy loss due to habitual molar pregnancy is uncommon and familial cases are extremely rare. The etiology of this disorder is not well understood but likely results from a maternal-effect mutation. Management options are limited, especially for couples who desire to have their own genetic offspring.  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