全文获取类型
收费全文 | 4586篇 |
免费 | 354篇 |
国内免费 | 12篇 |
专业分类
耳鼻咽喉 | 30篇 |
儿科学 | 138篇 |
妇产科学 | 50篇 |
基础医学 | 540篇 |
口腔科学 | 29篇 |
临床医学 | 611篇 |
内科学 | 934篇 |
皮肤病学 | 42篇 |
神经病学 | 396篇 |
特种医学 | 159篇 |
外科学 | 981篇 |
综合类 | 72篇 |
一般理论 | 5篇 |
预防医学 | 373篇 |
眼科学 | 94篇 |
药学 | 250篇 |
中国医学 | 4篇 |
肿瘤学 | 244篇 |
出版年
2023年 | 44篇 |
2022年 | 88篇 |
2021年 | 212篇 |
2020年 | 81篇 |
2019年 | 156篇 |
2018年 | 173篇 |
2017年 | 137篇 |
2016年 | 142篇 |
2015年 | 184篇 |
2014年 | 265篇 |
2013年 | 287篇 |
2012年 | 379篇 |
2011年 | 376篇 |
2010年 | 180篇 |
2009年 | 170篇 |
2008年 | 269篇 |
2007年 | 249篇 |
2006年 | 226篇 |
2005年 | 222篇 |
2004年 | 199篇 |
2003年 | 195篇 |
2002年 | 181篇 |
2001年 | 18篇 |
2000年 | 16篇 |
1999年 | 22篇 |
1998年 | 27篇 |
1997年 | 15篇 |
1996年 | 20篇 |
1995年 | 13篇 |
1994年 | 10篇 |
1992年 | 13篇 |
1991年 | 11篇 |
1989年 | 10篇 |
1987年 | 15篇 |
1986年 | 10篇 |
1984年 | 10篇 |
1983年 | 13篇 |
1982年 | 17篇 |
1981年 | 14篇 |
1980年 | 18篇 |
1979年 | 21篇 |
1978年 | 23篇 |
1977年 | 15篇 |
1976年 | 13篇 |
1975年 | 12篇 |
1973年 | 9篇 |
1972年 | 16篇 |
1971年 | 10篇 |
1964年 | 9篇 |
1940年 | 9篇 |
排序方式: 共有4952条查询结果,搜索用时 15 毫秒
81.
Jeffrey
L. Moran Anton L. Cottrill Jesse D. Benck Pingwei Liu Zhe Yuan Michael S. Strano Jacopo Buongiorno 《RSC advances》2018,8(38):21389
Closed-cell foams are widely applied as insulation and essential for the thermal management of protective garments for extreme environments. In this work, we develop and demonstrate a strategy for drastically reducing the thermal conductivity of a flexible, closed-cell polychloroprene foam to 0.031 ± 0.002 W m−1 K−1, approaching values of an air gap (0.027 W m−1 K−1) for an extended period of time (>10 hours), within a material capable of textile processing. Ultra-insulating neoprene materials are synthesized using high-pressure processing at 243 kPa in a high-molecular-weight gas environment, such as Ar, Kr, or Xe. A Fickian diffusion model describes both the mass infusion and thermal conductivity reduction of the foam as a function of processing time, predicting a 24–72 hour required exposure time for full charging of a 6 mm thick 5 cm diameter neoprene sample. These results enable waterproof textile insulation that approximates a wearable air gap. We demonstrate a wetsuit made of ultra-low thermally conductive neoprene capable of potentially extending dive times to 2–3 hours in water below 10 °C, compared with <1 hour for the state-of-the-art. This work introduces the prospect of effectively wearing a flexible air gap for thermal protection in harsh environments.Herein, we develop, demonstrate, and model a repeatable process for synthesizing ultra-low-thermal-conductivity closed-cell neoprene garments by infusing high-molecular-weight noble gases. 相似文献
82.
83.
84.
Phlorizin: a review 总被引:4,自引:0,他引:4
The dihydrochalcone phlorizin is a natural product and dietary constituent found in a number of fruit trees. It has been used as a pharmaceutical and tool for physiology research for over 150 years. Phlorizin's principal pharmacological action is to produce renal glycosuria and block intestinal glucose absorption through inhibition of the sodium-glucose symporters located in the proximal renal tubule and mucosa of the small intestine.This review covers the role phlorizin has played in the history of diabetes mellitus and its use as an agent to understand fundamental concepts in renal physiology as well as summarizes the physiology of cellular glucose transport and the pathophysiology of renal glycosuria. It reviews the biology and pathobiology of glucose transporters and discusses the medical botany of phlorizin and the potential effects of plant flavonoids, such as phlorizin, on human metabolism. Lastly, it describes the clinical pharmacology and toxicology of phlorizin, including investigational uses of phlorizin and phlorizin analogs in the treatment of diabetes, obesity, and stress hyperglycemia. 相似文献
85.
Wojciech Jurczak Simon Rule Peter Martin Rebecca Auer Brad S. Kahl Agnieszka Giza Bożena Jachimczak Ranjana H. Advani Jorge Romaguera Michael Williams Jacqueline Barrientos Ewa Chmielowska John Radford Stephan Stilgenbauer Jesse McGreivy Fong Clow Darrin M. Beaupre Lori Kunkel Michael L. Wang 《Acta haematologica Polonica》2013,44(3):314-318
Bruton's tyrosine kinase (BTK) is a central mediator of B-cell receptor (BCR) signaling essential for normal B-cell development. Ibrutinib is an oral BTK inhibitor that induces apoptosis and inhibits migration and adhesion of malignant B-cells. Updated results of this international, multicenter, phase 2 study of single agent ibrutinib in relapsed or refractory MCL will be presented.Ibrutinib 560 mg PO QD was administered continuously until disease progression. Tumor response was assessed every 2 cycles (one cycle = 28 days). The study enrolled 115 patients (65 bortezomib-naïve, 50 bortezomib-exposed); 111 patients were treated; 110 were evaluable for response. Baseline characteristics included: median age 68 years, time since diagnosis 42 months, number of prior treatments 3; bulky disease (>10 cm) 13%, prior stem cell transplant 10%, high risk MIPI 49%.Median time on treatment was 9.2 months; 53% of patients remain on therapy. Median PFS was 13.9 months and DOR has not yet been reached. Responses increased with longer treatment: comparing to previous data described at ASH 2011, the CR rate increased from 16% to 39%, and the ORR increased from 69% to 75%. 相似文献
86.
87.
88.
Jiang Wei Wang Xiaoyu Ren Jinchang Li Sen Sun Meijun Wang Zheng Jin Jesse S. 《Cognitive computation》2021,13(5):1287-1296
Cognitive Computation - Different artists have their unique painting styles, which can be hardly recognized by ordinary people without professional knowledge. How to intelligently analyze such... 相似文献
89.
90.