全文获取类型
收费全文 | 43657篇 |
免费 | 2135篇 |
国内免费 | 255篇 |
专业分类
耳鼻咽喉 | 558篇 |
儿科学 | 786篇 |
妇产科学 | 458篇 |
基础医学 | 5302篇 |
口腔科学 | 1367篇 |
临床医学 | 2979篇 |
内科学 | 10212篇 |
皮肤病学 | 880篇 |
神经病学 | 3897篇 |
特种医学 | 2170篇 |
外国民族医学 | 1篇 |
外科学 | 7321篇 |
综合类 | 162篇 |
一般理论 | 6篇 |
预防医学 | 1278篇 |
眼科学 | 851篇 |
药学 | 2747篇 |
中国医学 | 83篇 |
肿瘤学 | 4989篇 |
出版年
2023年 | 250篇 |
2022年 | 451篇 |
2021年 | 819篇 |
2020年 | 479篇 |
2019年 | 588篇 |
2018年 | 771篇 |
2017年 | 635篇 |
2016年 | 815篇 |
2015年 | 788篇 |
2014年 | 1067篇 |
2013年 | 1302篇 |
2012年 | 2101篇 |
2011年 | 2177篇 |
2010年 | 1287篇 |
2009年 | 1106篇 |
2008年 | 1942篇 |
2007年 | 2192篇 |
2006年 | 2081篇 |
2005年 | 2074篇 |
2004年 | 2078篇 |
2003年 | 1951篇 |
2002年 | 1981篇 |
2001年 | 1407篇 |
2000年 | 1481篇 |
1999年 | 1371篇 |
1998年 | 615篇 |
1997年 | 485篇 |
1996年 | 467篇 |
1995年 | 370篇 |
1994年 | 367篇 |
1993年 | 344篇 |
1992年 | 1030篇 |
1991年 | 888篇 |
1990年 | 841篇 |
1989年 | 833篇 |
1988年 | 783篇 |
1987年 | 771篇 |
1986年 | 683篇 |
1985年 | 636篇 |
1984年 | 438篇 |
1983年 | 358篇 |
1979年 | 302篇 |
1978年 | 206篇 |
1977年 | 181篇 |
1974年 | 189篇 |
1973年 | 165篇 |
1972年 | 162篇 |
1971年 | 183篇 |
1970年 | 155篇 |
1969年 | 177篇 |
排序方式: 共有10000条查询结果,搜索用时 187 毫秒
1.
2.
3.
4.
5.
Masaru Sasaki Tsuyoshi Takahashi Soichiro Funaki Koji Tanaka Yasuhiro Miyazaki Naoko Ose Tomoki Makino Yukinori Kurokawa Makoto Yamasaki Kiyokazu Nakajima Yasushi Shintani Masaki Mori Yuichiro Doki 《Asian journal of endoscopic surgery》2021,14(1):116-119
We report a case of a diaphragmatic hernia after a heart transplant operation. A 43-year-old woman, who underwent orthotropic heart transplantation for hypertrophic cadiomyopathy two year earlier, presented with vomiting and epigastric pain. A computed tomography scan showed that the stomach and transverse colon were dislocated in the left thoracic cavity. We diagnosed left diaphragmatic hernia incarceration and performed laparoscopic repair of the diaphragmatic hernia. A 12 × 8 cm diaphragmatic defect was found intraoperatively on the ventrolateral aspect of the left diaphragm, and the stomach with volvulus had herniated into the thorax through the defect. The hernia was considered to be iatrogenic. The diaphragmatic defect was large, and the diaphragm was thinning. We closed the defect by mesh repair. Laparoscopic mesh repair of the diaphragmatic hernia could be performed safely and with minimal invasiveness. 相似文献
6.
7.
8.
Maria C. Chammas Andre C. Oliveira Mario J. D´Ávilla Pedro H. Moraes Marcelo Straus Takahashi 《Ultrasound in medicine & biology》2019,45(1):50-55
We prospectively evaluated the effectiveness of contrast-enhanced ultrasonography (CEUS) for differentiation of benign versus malignant portal vein thrombosis (PVT). We studied a total of 43 patients with chronic liver disease, hepatocellular carcinoma-suggestive nodules and confirmed PVT, in whom the nature of the PVT was confirmed by follow-up imaging (US, computed tomography and/or magnetic resonance imaging) performed up to 6 mo after CEUS. PVT was assessed by US, Doppler US and CEUS with respect to vessel wall disruption and/or invasion, color Doppler vascularization, pulsed Doppler vascularization pattern and CEUS enhancement and vascularization pattern, and thrombi were classified as benign or malignant based on these findings. Follow-up studies revealed malignant PVT in 22 of the 43 patients (51%) and benign PVT in 21 patients (49%). CEUS findings were consistent with follow-up studies in 41 of the 43 patients (95%), with κ?=?0.903 (p < 0.0001), sensitivity?=?91% and specificity?=?100%, indicating that CEUS can be confidently used to differentiate benign from malignant portal vein thrombosis in the setting of chronic liver disease. 相似文献
9.
Comparative safety study on severe anemia by simeprevir versus telaprevir‐based triple therapy for chronic hepatitis C
下载免费PDF全文
![点击此处可从《Journal of gastroenterology and hepatology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Eiichi Ogawa Norihiro Furusyo Eiji Kajiwara Hideyuki Nomura Akira Kawano Kazuhiro Takahashi Kazufumi Dohmen Takeaki Satoh Koichi Azuma Makoto Nakamuta Toshimasa Koyanagi Kazuhiro Kotoh Shinji Shimoda Jun Hayashi The Kyushu University Liver Disease Study Group 《Journal of gastroenterology and hepatology》2015,30(8):1309-1316
10.
Rena Fushiki Kotoe Mayahara Mai Ogawa Yasuyo Takahashi Yoko Karasawa Niina Tsurumachi 《Connective tissue research》2015,56(4):336-341
Purpose: Orthodontic tooth movement occurs during the bone remodeling induced by therapeutic mechanical strain. It is important to investigate the relation between the strength of mechanical stress and bone formation activity. The aim of this study was to determine the effect of high-magnitude mechanical strain on bone formation in detail.Materials and methods: Osteoblast-like cells isolated from fetal rat calvariae were loaded with 18% cyclic tension force (TF) for 48?h. To phenotypically investigate the effect of TF, we measured the number and the size of bone nodules stained by von Kossa technique on day 21 after cell seeding and determined the calcium content of bone nodules on day 14. Furthermore, we examined the gene expression of BMP-2, Runx2 and Msx2, which are important factors for bone nodule formation, on days 1, 4 and 7 after TF loading.Results: The maximum bone nodule size in the control group was 1620 and 719?μm in the TF group. Furthermore, the mean number of bone nodules sized over 360?μm in the TF group was significantly decreased compared to the control group. The calcium content was also significantly decreased to 42% by TF loading. The mRNA expression of BMP-2, Runx2 and Msx2 was decreased 1 and 4 days after TF loading.Conclusion: The differentiation of bone forming progenitor cells into bone nodule forming cells was inhibited by TF due to the decreased expression of bone formation related factors such as BMP-2, Runx2 and Msx2. 相似文献