全文获取类型
收费全文 | 15027篇 |
免费 | 724篇 |
国内免费 | 68篇 |
专业分类
耳鼻咽喉 | 96篇 |
儿科学 | 172篇 |
妇产科学 | 156篇 |
基础医学 | 1815篇 |
口腔科学 | 356篇 |
临床医学 | 937篇 |
内科学 | 3376篇 |
皮肤病学 | 1089篇 |
神经病学 | 1556篇 |
特种医学 | 605篇 |
外科学 | 2466篇 |
综合类 | 94篇 |
预防医学 | 390篇 |
眼科学 | 126篇 |
药学 | 1418篇 |
中国医学 | 35篇 |
肿瘤学 | 1132篇 |
出版年
2022年 | 92篇 |
2021年 | 221篇 |
2020年 | 128篇 |
2019年 | 164篇 |
2018年 | 234篇 |
2017年 | 180篇 |
2016年 | 250篇 |
2015年 | 258篇 |
2014年 | 331篇 |
2013年 | 360篇 |
2012年 | 579篇 |
2011年 | 598篇 |
2010年 | 342篇 |
2009年 | 287篇 |
2008年 | 602篇 |
2007年 | 643篇 |
2006年 | 617篇 |
2005年 | 604篇 |
2004年 | 651篇 |
2003年 | 651篇 |
2002年 | 613篇 |
2001年 | 580篇 |
2000年 | 652篇 |
1999年 | 606篇 |
1998年 | 233篇 |
1997年 | 151篇 |
1996年 | 149篇 |
1995年 | 139篇 |
1994年 | 115篇 |
1993年 | 99篇 |
1992年 | 434篇 |
1991年 | 384篇 |
1990年 | 396篇 |
1989年 | 418篇 |
1988年 | 395篇 |
1987年 | 365篇 |
1986年 | 318篇 |
1985年 | 284篇 |
1984年 | 168篇 |
1983年 | 150篇 |
1982年 | 80篇 |
1979年 | 163篇 |
1978年 | 80篇 |
1977年 | 83篇 |
1975年 | 68篇 |
1974年 | 71篇 |
1973年 | 80篇 |
1972年 | 84篇 |
1970年 | 74篇 |
1969年 | 69篇 |
排序方式: 共有10000条查询结果,搜索用时 15 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
4.
Sadahiro Hijikata Igen Hongo Shu-ichi Nakayama Tetsuo Yamaguchi Yoshiyuki Sekikawa Toshihiro Nozato Takashi Ashikaga 《The Canadian journal of cardiology》2019,35(1):104.e9-104.e11
Syphilis is a sexually transmitted disease caused by Treponema pallidum. Syphilitic aortitis might coexist in a dysfunctional aortic valve, but the etiology remains unclear, because microbiological diagnosis is difficult. A 62-year-old man with low-grade fever was diagnosed with aortitis and infective endocarditis, due to Treponema pallidum infection, using polymerase chain reaction analysis. This case suggests that syphilis might cause infective endocarditis. 相似文献
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.
Kengo Maeda Shinji Kume Yoshihiko Nishio Shiro Maeda Yasuhiro Nishida Mikio Suzuki Takahiro Nakaguchi Toru Kawabata Osamu Hashimoto Takashi Hisanaga Atsunori Kashiwagi Hitoshi Yasuda 《Clinical neurology》2006,46(4):266-269
We report a 53-year-old woman with severe Graves' ophthalmopathy accompanied by uncontrolled myasthenia gravis. She presented remarkable exophthalmos, chemosis, and restriction of eye movement. Despite plasma exchange, steroid pulse therapy, local injection of steroid, and irradiation, ocular symptoms did not ameliorate. Since optic neuropathy was seen, orbital decompression surgery was performed in the left eye. Bilateral chemosis was improved after the surgery. Five years after surgery, there was no ocular palsy in the operated left eye, but in the contralateral eye. For the good prognosis of the eye movement, orbital decompression might be recommended in the severe Graves' ophthalmopathy accompanied by the optic neuropathy and/or ophthalmoplegia with proptosis. 相似文献
9.
Katsuo Kamata Ayako Makino Noriyasu Kanie Shu-ichi Oda Takayuki Matsumoto Tsuneo Kobayashi Toyohiko Kikuchi Masato Nishimura Toshio Honda 《Journal of Smooth Muscle Research》2006,42(2-3):75-88
Anthocyanins, which are responsible for a variety of bright colors (including red, blue, and purple) in fruits, vegetables, and flowers, are consumed as dietary polyphenols. Anthocyanin-containing fruits are thought to decrease coronary heart disease and are used in anti-diabetic preparations. Diabetes is associated with a variety of cardiovascular complications that may be mediated by endothelial dysfunction, and so this study was designed mainly to characterize the influence of a synthesized anthocyanidin derivative (HK-008) over acetylcholine (ACh)-induced relaxation in mesenteric arterial beds isolated from rats. In a glucose-tolerance test in intact rats, HK-008 (30 mg/kg) reduced the glucose level as effectively as the same dose of glibenclamide. The aortic relaxation induced by pinacidil (an ATP-sensitive potassium channel opener) was greatly inhibited by glibenclamide (10 microM), and also significantly inhibited by HK-008 (10 microM). Interestingly, the ACh-induced relaxation in the perfused, preconstricted mesenteric arterial bed was significantly enhanced by HK-008 (10 microM), and this enhancement was significantly attenuated by indomethacin (10 microM). The ACh-induced mesenteric relaxation was impaired by an increase in oxidative stress, viz. superoxide-generating treatment [xanthine oxidase (XO; 0.1 U/ml) plus hypoxanthine (HX; 10 microM)]. However, this impairment was strongly suppressed by HK-008 (10 microM). These results suggest that HK-008 increases endothelium-induced relaxation by suppressing oxidative stress or modulating prostanoids signaling. This compound may therefore be useful against certain cardiovascular disorders. 相似文献
10.