全文获取类型
收费全文 | 19639篇 |
免费 | 982篇 |
国内免费 | 101篇 |
专业分类
耳鼻咽喉 | 149篇 |
儿科学 | 242篇 |
妇产科学 | 226篇 |
基础医学 | 2336篇 |
口腔科学 | 460篇 |
临床医学 | 1188篇 |
内科学 | 4755篇 |
皮肤病学 | 1232篇 |
神经病学 | 1877篇 |
特种医学 | 810篇 |
外科学 | 3227篇 |
综合类 | 113篇 |
预防医学 | 477篇 |
眼科学 | 188篇 |
药学 | 1714篇 |
中国医学 | 62篇 |
肿瘤学 | 1666篇 |
出版年
2023年 | 75篇 |
2022年 | 133篇 |
2021年 | 332篇 |
2020年 | 196篇 |
2019年 | 236篇 |
2018年 | 341篇 |
2017年 | 269篇 |
2016年 | 363篇 |
2015年 | 377篇 |
2014年 | 465篇 |
2013年 | 523篇 |
2012年 | 893篇 |
2011年 | 941篇 |
2010年 | 529篇 |
2009年 | 460篇 |
2008年 | 878篇 |
2007年 | 952篇 |
2006年 | 893篇 |
2005年 | 891篇 |
2004年 | 929篇 |
2003年 | 981篇 |
2002年 | 901篇 |
2001年 | 641篇 |
2000年 | 682篇 |
1999年 | 677篇 |
1998年 | 302篇 |
1997年 | 192篇 |
1996年 | 207篇 |
1995年 | 178篇 |
1994年 | 180篇 |
1993年 | 134篇 |
1992年 | 477篇 |
1991年 | 409篇 |
1990年 | 421篇 |
1989年 | 442篇 |
1988年 | 415篇 |
1987年 | 400篇 |
1986年 | 327篇 |
1985年 | 299篇 |
1984年 | 180篇 |
1983年 | 153篇 |
1982年 | 99篇 |
1981年 | 75篇 |
1979年 | 170篇 |
1978年 | 85篇 |
1977年 | 94篇 |
1974年 | 73篇 |
1973年 | 82篇 |
1972年 | 88篇 |
1970年 | 78篇 |
排序方式: 共有10000条查询结果,搜索用时 234 毫秒
1.
2.
Shingo Hashimoto Masaki Katsurada Rie Muramatsu Kumiko Asai Kenichiro Tanaka Kensuke Hayashi Yoshiaki Kibe Koichiro Nakajima Yukiko Hattori Hiromitsu Iwata Jun-etsu Mizoe Hiroyuki Ogino Yuta Shibamoto 《Practical radiation oncology》2019,9(2):e149-e155
Purpose
Suppression of respiratory movement of the liver would be desirable for high-precision radiation therapy for liver tumors. We aimed to investigate the effect of our original device-free compressed shell fixation method and breathing instruction on suppression of respiratory movement. The characteristics of liver motion based on the movement of a fiducial marker were also analyzed.Methods and Materials
First, respiratory amplitudes of the liver with the device-free compressed shell were analyzed from the data of 146 patients. The effect of this shell fixing method on liver movement was evaluated. Second, as another cohort study with 166 patients, interfractional internal motion of the liver for patients fixed in the shell was calculated using the fiducial marker coordinate data of images for position setting before daily irradiation. Third, in another 12 patients, intrafractional internal motion was calculated from the fiducial marker coordinate data using x-ray images before and after irradiation.Results
The median respiratory movement without the shell, after fixing with the shell, and after instructing on the breathing method with the shell was 14.2 (interquartile range, 10.7-19.8), 11.5 (8.6-17.5), and 10.4 mm (7.3-15.8), respectively. Systematic and random errors of interfractional internal motion were all ≤2 mm in the left-right and anteroposterior directions and 3.7 and 3.0 mm, respectively, in the craniocaudal direction. Systematic and random errors of intrafractional internal motion were all ≤1.3 mm in the left-right and anteroposterior directions and 0.8 and 2.4 mm, respectively, in the craniocaudal direction.Conclusions
The device-free compressed shell fixation method was effective in suppressing the respiratory movement of the liver. Irradiation position matching using the fiducial marker can correct the interfractional internal motion on each day, which would contribute to the reduction of the margin to be given around the target. 相似文献3.
A case of bullous pemphigoid associated with psoriasis vulgaris showing Hailey–Hailey disease‐like histopathological changes in regenerated epidermis without genomic mutation in ATP2C1 or ATP2A2 gene
下载免费PDF全文
![点击此处可从《Journal of the European Academy of Dermatology and Venereology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
4.
5.
6.
Hiroto Kinoshita Hitomi Nishioka Aya Ikeda Kyoko Ikoma Yoichi Sameshima Hidehisa Ohi Mizuki Tatsuno Junka Kouyama Chiaki Kawamoto Tomohiro Mitsui Yuko Tamura Yu Hashimoto Masashi Nishio Tsuyoshi Ogashiwa Yusuke Saigusa Shin Maeda Hideaki Kimura Reiko Kunisaki Kazuhiko Koike 《Journal of gastroenterology and hepatology》2019,34(11):1929-1939
7.
neurogenetics - Mediator (MED) is a key regulator of protein-coding gene expression, and mutations in MED subunits are associated with a broad spectrum of diseases. Because mutations in MED17... 相似文献
8.
9.
Shinji Naganawa Rintaro Ito Hisashi Kawai Toshiaki Taoka Tadao Yoshida Michihiko Sone 《Magnetic resonance in medical sciences》2020,19(4):375
Purpose:It has been reported previously that intravenously administered gadolinium-based contrast agent (GBCA) leaks into the subarachnoid space around the cortical veins at 4 h after injection in all old people over 37 years, but not in younger people up to 37 years of age in 3D-real IR images. The purpose of this study was to investigate whether there was a strict threshold of 37 years of age for the leakage of the GBCA into the subarachnoid space.Methods:The subjects included 190 patients, that were scanned for 3D-real IR images at 4 hours after intravenous injection of GBCA as a diagnostic test for endolymphatic hydrops. The patient’s age ranged from 14 to 81 years. Two experienced neuroradiologists evaluated the images to determine whether the GBCA leakage around the cortical veins was positive or negative. Any discrepancies between the two observers were discussed and a consensus was obtained.A Mann–Whitney U test and receiver operating characteristic (ROC) curve analysis were used to compare the positive and the negative group and to set the age cut-off value for the prediction of GBCA leakage.Results:The GBCA leakage around the cortical veins was negative in 35 patients and positive in 155 patients. The average age was 33 ± 11 years in the negative group, and 55 ± 12 years in the positive group (P < 0.01). In the ROC analysis for the age and leakage of the GBCA, an area under the curve was 0.905 and the cut-off age was 37.317 years (sensitivity of 0.942 and specificity of 0.771).Conclusion:Intravenously administered GBCA leaks into the subarachnoid space around the cortical veins in most patients over 37 years of age. However, it should be noted that it can be found occasionally in patients under 37 years of age. 相似文献