全文获取类型
| 收费全文 | 704398篇 |
| 免费 | 49919篇 |
| 国内免费 | 1296篇 |
专业分类
| 耳鼻咽喉 | 9204篇 |
| 儿科学 | 23255篇 |
| 妇产科学 | 17598篇 |
| 基础医学 | 110383篇 |
| 口腔科学 | 19949篇 |
| 临床医学 | 63675篇 |
| 内科学 | 134170篇 |
| 皮肤病学 | 16157篇 |
| 神经病学 | 49412篇 |
| 特种医学 | 25728篇 |
| 外国民族医学 | 76篇 |
| 外科学 | 104473篇 |
| 综合类 | 14811篇 |
| 现状与发展 | 2篇 |
| 一般理论 | 160篇 |
| 预防医学 | 51320篇 |
| 眼科学 | 16306篇 |
| 药学 | 53928篇 |
| 3篇 | |
| 中国医学 | 2354篇 |
| 肿瘤学 | 42649篇 |
出版年
| 2021年 | 5437篇 |
| 2018年 | 7856篇 |
| 2017年 | 6106篇 |
| 2016年 | 6822篇 |
| 2015年 | 7554篇 |
| 2014年 | 10271篇 |
| 2013年 | 15382篇 |
| 2012年 | 20498篇 |
| 2011年 | 21496篇 |
| 2010年 | 12721篇 |
| 2009年 | 11934篇 |
| 2008年 | 19996篇 |
| 2007年 | 21514篇 |
| 2006年 | 21902篇 |
| 2005年 | 20447篇 |
| 2004年 | 19997篇 |
| 2003年 | 18950篇 |
| 2002年 | 18458篇 |
| 2001年 | 36331篇 |
| 2000年 | 36898篇 |
| 1999年 | 30378篇 |
| 1998年 | 7876篇 |
| 1997年 | 6663篇 |
| 1996年 | 6971篇 |
| 1995年 | 6627篇 |
| 1994年 | 6098篇 |
| 1993年 | 5590篇 |
| 1992年 | 22969篇 |
| 1991年 | 22925篇 |
| 1990年 | 22310篇 |
| 1989年 | 22076篇 |
| 1988年 | 20040篇 |
| 1987年 | 19421篇 |
| 1986年 | 18467篇 |
| 1985年 | 17306篇 |
| 1984年 | 12699篇 |
| 1983年 | 10742篇 |
| 1982年 | 5921篇 |
| 1979年 | 11518篇 |
| 1978年 | 8128篇 |
| 1977年 | 6832篇 |
| 1976年 | 6594篇 |
| 1975年 | 7268篇 |
| 1974年 | 8498篇 |
| 1973年 | 8141篇 |
| 1972年 | 7658篇 |
| 1971年 | 7127篇 |
| 1970年 | 6877篇 |
| 1969年 | 6306篇 |
| 1968年 | 5780篇 |
排序方式： 共有10000条查询结果，搜索用时 15 毫秒
111.
Éktova L. V. Goryunova O. V. Eremina V. A. Tikhonova N. I. Medvedeva L. A. 《Pharmaceutical Chemistry Journal》2019,53(7):604-609
Pharmaceutical Chemistry Journal - Use of formylindolylacetic acid as a reagent at the stage of preparing the glycosides of bis(indolyl)furan-2,5-diones and dioxane as solvent increased yields from... 相似文献
112.
113.
114.
115.
116.
117.
Cécile Vicier Lillian Werner Jonathan Chipman Lauren C. Harshman Dattatraya H. Patil Raina N. Fichorova Jennifer R. Rider Martin G. Sanda Lorelei A. Mucci Christopher J. Sweeney 《Clinical genitourinary cancer》2019,17(1):32-37
Background
Inflammation and infections have been associated with prostate cancer progression. We assessed whether elevated serum cytokines or T. vaginalis seropositivity at the time of diagnosis was associated with higher grade or lethal prostate cancer.Patients and Methods
Men with localized or metastatic prostate cancer were included in this study. Cytokine serum levels including interleukin (IL)-1α, IL-1β, IL-2, IL-6, IL-8, monocyte chemotactic protein 1 (CCL-2), tumor necrosis factor α, and growth-regulated oncogene α (CXCL-1) using a multiplex enzyme-linked immunosorbent assay and T. vaginalis serology were measured in blood samples at diagnosis.Results
A total of 324 patients were identified at time of localized disease and 118 at time of metastatic disease. Of the 189 patients with localized disease and clinical follow-up data (median, 73 months), 28 developed lethal disease. There was no association between circulating cytokine levels above median concentrations nor T. vaginalis seropositivity and risk of intermediate- to high-risk or lethal prostate cancer.Conclusion
Higher levels of serum cytokine levels and T. vaginalis seropositivity at diagnosis are not associated with high-grade or lethal prostate cancer and do not aid risk stratification of localized prostate cancer. 相似文献118.
119.
Anton A. Semenistyy Elena A. Litvina EA Anna G. Fedotova Chukwuweike Gwam Andrey N. Mironov 《Injury》2019,50(2):515-520
Background
Intramedullary nailing is considered a “gold standard” for treatment of tibial shaft fractures. However, some types of fractures are typically considered as “difficult for nailing”. This group includes the periarticular fractures, fractures of both bones at the same level, comminuted and segmental fractures of the tibia. Fixator-assisted nailing (FAN) is an effective method treatment of these types of fractures. The main requirements for the ideal reduction device are an ease of its installation and an ability of multiplanar fracture reduction. Fixator-assisted nailing (FAN) with the use of two perpendicular to each other monolateral tubular frames perfectly meets these requirements. In this study we present this new surgical technique and the analysis of first 30 cases.Methods
A prospective analysis was conducted for 30 patients with “difficult for nailing” tibial fractures treated with fixator-assisted nailing in our institution between September 1st, 2017, and March 1st, 2018. The duration of surgery and its different stages, the time of fluoroscopy, difficulties encountered during surgery, were analyzed. Clinical and radiological methods were used to evaluated reduction quality.Results
In all 30 cases the acceptable reduction was achieved. The mean duration of the surgical procedure was 73.7?±?3?min. The mean duration of fluoroscopy 85.9?±?4.8?s. In 7 cases we faced with technical difficulties, which were successfully addressed.Conclusion
The described technique of FAN is an effective method for the treatment of “difficult for nailing” tibial fractures. Future multi-centered studies with a larger number of patients are needed to validate our results. 相似文献120.