全文获取类型
收费全文 | 25019篇 |
免费 | 1213篇 |
国内免费 | 136篇 |
专业分类
耳鼻咽喉 | 280篇 |
儿科学 | 379篇 |
妇产科学 | 284篇 |
基础医学 | 3262篇 |
口腔科学 | 445篇 |
临床医学 | 1704篇 |
内科学 | 6721篇 |
皮肤病学 | 658篇 |
神经病学 | 1915篇 |
特种医学 | 999篇 |
外科学 | 4186篇 |
综合类 | 108篇 |
一般理论 | 2篇 |
预防医学 | 674篇 |
眼科学 | 418篇 |
药学 | 1683篇 |
中国医学 | 93篇 |
肿瘤学 | 2557篇 |
出版年
2023年 | 153篇 |
2022年 | 282篇 |
2021年 | 439篇 |
2020年 | 232篇 |
2019年 | 352篇 |
2018年 | 439篇 |
2017年 | 347篇 |
2016年 | 410篇 |
2015年 | 483篇 |
2014年 | 606篇 |
2013年 | 768篇 |
2012年 | 1228篇 |
2011年 | 1356篇 |
2010年 | 733篇 |
2009年 | 611篇 |
2008年 | 1119篇 |
2007年 | 1279篇 |
2006年 | 1193篇 |
2005年 | 1284篇 |
2004年 | 1194篇 |
2003年 | 1150篇 |
2002年 | 1175篇 |
2001年 | 759篇 |
2000年 | 785篇 |
1999年 | 730篇 |
1998年 | 325篇 |
1997年 | 254篇 |
1996年 | 274篇 |
1995年 | 231篇 |
1994年 | 216篇 |
1993年 | 159篇 |
1992年 | 541篇 |
1991年 | 546篇 |
1990年 | 505篇 |
1989年 | 494篇 |
1988年 | 395篇 |
1987年 | 355篇 |
1986年 | 377篇 |
1985年 | 341篇 |
1984年 | 235篇 |
1983年 | 202篇 |
1982年 | 109篇 |
1980年 | 108篇 |
1979年 | 182篇 |
1978年 | 123篇 |
1977年 | 112篇 |
1974年 | 101篇 |
1972年 | 106篇 |
1969年 | 98篇 |
1968年 | 100篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Hideyuki Masuda Makoto Kimura Akiko Nishioka Hiroshi Kato Akimichi Morita 《Journal of dermatological science》2019,93(2):109-115
Background
Photosensitizers used for photodynamic therapy (PDT) to treat dermatologic disease are metabolized into mainly protoporphyrin IX (PpIX), which has five absorption wavelength peaks: 410?nm, 510?nm, 545?nm, 580?nm, and 630?nm. Although only red light around 635?nm and blue light around 400?nm are used as light sources for PDT, the efficiency of PDT might be improved by using multiple wavelengths, including those that correspond to the other absorption peaks of PpIX. Furthermore, because the target disease often occurs on the face, a flexible-type light-source unit that can be fitted to the lesion without unnecessarily exposing the mucous membranes, e.g., the eyes, nostrils, and mouth, is preferred.Objective
We investigated the efficacy of a flexible light-emitting diode (LED) unit that emits multiple wavelengths to improve PDT effects.Methods
HaCaT cells were incubated with 5-ALA and subsequently irradiated with either a single wavelength or sequentially with two wavelengths. Cell viability and reactive oxygen species were analyzed. Nude mice were implanted with COLO679 cells by subcutaneous injection into the flank. 5-ALA was subcutaneously injected into the tumor. The tumor was irradiated with 50?J/cm2 (day 0) and assessed daily until day 21.Results
The synergistic PDT effects of dual-wavelength irradiation and reactive oxygen species production were highest with the 405-nm and 505-nm wavelength combination. This dual wavelength combination was also the most effective in vivo.Conclusion
We could therefore conclude that dual-wavelength PDT is an efficient strategy for improving the therapeutic effects of PDT. Using a flexible LED unit is expected to achieve more uniform irradiation of uneven areas. 相似文献2.
3.
4.
Kensuke Kudou Hiroshi Saeki Yuichiro Nakashima Shun Sasaki Tomoko Jogo Kosuke Hirose Qingjiang Hu Yasuo Tsuda Koichi Kimura Ryota Nakanishi Nobuhide Kubo Koji Ando Eiji Oki Tetsuo Ikeda Yoshihiko Maehara 《American journal of surgery》2019,217(4):757-763
Background
There were few studies assessed the postoperative sarcopenia in patients with cancers. The objective of present study was to assess whether postoperative development of sarcopenia could predict a poor prognosis in patients with adenocarcinoma of esophagogastric junction, (AEG) and upper gastric cancer (UGC).Methods
Patients with AEG and UGC who were judged as non-sarcopenic before surgery were reassessed the presence of postoperative development of sarcopenia 6 months after surgery. Patients were divided into the development group or non-development group, and clinicopathological factors and prognosis between these two groups were analyzed.Results
The 5-year overall survival rates were significantly poorer in the development group than non-development group (68.0% vs. 92.6%, P?=?0.0118). Multivariate analyses showed that postoperative development of sarcopenia was an independent prognostic factor for poor overall survival (P?=?0.0237).Conclusions
Postoperative development of sarcopenia was associated with a poor prognosis in patients with AEG and UGC. 相似文献5.
<正>Stroke is a leading cause of mortality and severe neurological disability worldwide; however, curative therapeutic options are limited. Although recanalization therapy using endovascular thrombectomy has demonstrated great benefits in the functional outcome of patients with acute ischemic stroke, the rate of excellent clinical outcomes remains limited. Therefore, the current recanalization 相似文献
6.
7.
8.
Taisuke Inada Satoshi Fukushima Masayuki Murai Masatoshi Jinnin Azusa Miyashita Satoshi Nakahara Junji Yamashita Jun Aoi Shinichi Masuguchi Hironobu Ihn 《The Journal of dermatology》2015,42(2):198-201
miRNA‐221 (miR‐221) is known to be abnormally expressed in many human cancers. The serum levels of miR‐221 have been reported as a tumor marker for malignant melanoma (MM). We hypothesized that the hair shaft miR‐221 levels may be increased in patients with MM. We therefore assessed the possibility that hair shaft miR‐221 levels could be a marker for MM. The hair shaft miR‐221 levels were significantly higher in patients with MM than controls. The rates of increased hair shaft miR‐221 levels above the cut‐off value were comparable to those of serum 5‐S‐CD, which is a tumor marker commonly used for MM. Measurements of the hair shaft miR‐221 levels could have potential clinical value in the detection of MM. This is the first report investigating the hair shaft levels of an miRNA in patients with MM. Our investigations offer new insight into the relationship between miR‐221 and MM, and may provide a new, non‐invasive way to screen for melanoma. 相似文献
9.
John Lennon Silva Cunha Amanda Almeida Leite Thamiris de Castro Abrantes Lorena Passoni Vervloet Thayn Melo de Lima Morais Gerson de Oliveira Paiva Neto Tatiana Nayara Librio Kimura Snia Maria Soares Ferreira Ricardo Luiz Cavalcanti de Albuquerque‐Júnior Aline Corrêa Abraho Mario Jos Romaach Bruno Augusto Benevenuto de Andrade Oslei Paes de Almeida Ciro Dantas Soares 《Journal of cutaneous pathology》2021,48(1):24-33
10.
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