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   31113篇
  免费   2746篇
  国内免费   1049篇
耳鼻咽喉   299篇
儿科学   561篇
妇产科学   515篇
基础医学   4762篇
口腔科学   932篇
临床医学   2731篇
内科学   5736篇
皮肤病学   594篇
神经病学   2673篇
特种医学   1159篇
外国民族医学   2篇
外科学   4151篇
综合类   2469篇
一般理论   8篇
预防医学   1896篇
眼科学   680篇
药学   2910篇
中国医学   413篇
肿瘤学   2417篇
  2023年   94篇
  2022年   198篇
  2021年   424篇
  2020年   253篇
  2019年   384篇
  2018年   663篇
  2017年   529篇
  2016年   527篇
  2015年   616篇
  2014年   786篇
  2013年   1019篇
  2012年   1379篇
  2011年   1380篇
  2010年   890篇
  2009年   762篇
  2008年   1249篇
  2007年   1344篇
  2006年   1216篇
  2005年   1021篇
  2004年   912篇
  2003年   831篇
  2002年   702篇
  2001年   2291篇
  2000年   2198篇
  1999年   1810篇
  1998年   672篇
  1997年   452篇
  1996年   316篇
  1995年   277篇
  1994年   241篇
  1993年   224篇
  1992年   1000篇
  1991年   890篇
  1990年   796篇
  1989年   883篇
  1988年   800篇
  1987年   739篇
  1986年   690篇
  1985年   608篇
  1984年   382篇
  1983年   318篇
  1982年   181篇
  1981年   138篇
  1980年   117篇
  1979年   201篇
  1973年   93篇
  1972年   92篇
  1971年   94篇
  1970年   83篇
  1968年   83篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
We report a Chinese family with members affected by epidermolytic ichthyosis (EI), caused by KRT gene mutations. The proband was a 14‐year‐old boy who had simultaneous appearance of nephroblastoma and epidermolytic ichthyosis (EI). Both the patient and his mother exhibited the specific clinical and pathological manifestations of EI. We analysed all exons and flanking sequences of the KRT1 and KRT10 genes using PCR, and found that the proband and his mother had a G>C transition at nucleotide position 1432 in exon 7 of KRT1, resulting in an amino acid substitution of glutamate (GAA) to glutamine (CAA) at codon 478 (E478Q). The KRT10 gene had no mutations.  相似文献   
2.
Porocarcinoma is an unusual, locally aggressive and potentially fatal neoplasm. Several cutaneous malignancies have been described in association with porocarcinoma, including squamous cell carcinoma, basal cell carcinoma and tricholemmal carcinoma. Previous reports have indicated that the occurrence of malignant tumours in combination with porocarcinoma is extremely rare, in particular with regard to Bowen disease (BD). We report an uncommon case of porocarcinoma occurring synchronously in a single BD lesion in a 63‐year‐old woman with multiple BD lesions. The clinical and histological findings confirmed this diagnosis.  相似文献   
3.
4.

Background

Arterial vascular anomalies in patients undergoing kidney transplantation (KT) are correlated with a higher incidence of early surgical complications, potentially causing graft loss. Arterial reconstruction allows patients to overcome these surgical challenges, thus minimizing the risk of poor outcomes. The aim of the present study is to retrospectively investigate the safety and effectiveness of the multiple arterial reconstruction technique with a Teflon patch in case of an unavailable aortic patch: to do so, surgical complications, graft function, and patient survival were evaluated.

Methods

During the period January 2009 to August 2016, 202 adult deceased-donor KTs were performed at our center. Group A (n = 27; reconstruction of multiple arteries) and Group B (n = 175; control group) were compared.

Results

No differences were observed between the 2 groups in terms of early postoperative course, with no vascular complication observed in Group A. No vascular patch infections were reported, nor longer cold ischemia time rates. Similarly, long-term survival rates were similar between the 2 groups.

Conclusions

The Teflon-patch arterial reconstruction technique appears to be safe and effective, with an acceptable balance of benefits and potential risks of using a prosthetic material. Studies based on larger series are needed to further validate this approach.  相似文献   
5.
6.
While therapeutic approaches for psoriasis are widely available, preventive regimens are lacking. We aimed to determine whether improvements in epidermal function could prevent psoriasis relapse. Two self‐controlled cohort studies were designed, enrolling two cohorts of patients with psoriasis (n = 30 and n = 60) to be treated topically with an in‐house‐prepared emollient or ATOPALM® cream applied twice daily to one forearm for 20 and 30 days, respectively, while the same sites on the contralateral arm served as the untreated control. Epidermal function on both arms was assessed prior to and at the end of the trials. Delayed relapse on the treated arm was seen in 54.5% and 71% of patients in the first and second cohort, respectively. The time of psoriatic relapse correlated with the extent of abnormalities in baseline epidermal function. These results suggest that improvements in epidermal function with topical emollients can prevent/attenuate the development of psoriasis.  相似文献   
7.
8.
9.
Pancreatic cancer is a lethal disease characterized by early metastasis, local invasion, and resistance to conventional therapies. To understand its etiology and eventually make prevention of it possible and effective, appropriate carcinogenesis models will certainly help us understand the effects of environmental and genetic elements on pancreatic carcinogenesis. The development of new treatment strategies to control cancer metastasis is of immediate urgency. Fulfillment of this task relies on our knowledge of the cellular and molecular biology of pancreatic cancer metastasis and the availability of biologically and clinically relevant model systems. Many of the existing pancreatic cancer carcinogenesis and metastasis animal models are described in this review. The advantages and disadvantages of each model and their clinical implications are discussed, and special attention is focused on experimental therapeutic strategies targeting pancreatic cancer metastasis.  相似文献   
10.
应用常用的计算机软件建立了适合于教学医院图书馆的图书书目管理数据库,包括分类数据库、图书资产数据库等,并在我校的教学医院应用.管理数据库具有条目齐全、操作简单、查询方便等优点,在应用中取得了良好的效果.  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