全文获取类型
收费全文 | 2599篇 |
免费 | 131篇 |
国内免费 | 5篇 |
专业分类
耳鼻咽喉 | 83篇 |
儿科学 | 86篇 |
妇产科学 | 28篇 |
基础医学 | 250篇 |
口腔科学 | 184篇 |
临床医学 | 170篇 |
内科学 | 524篇 |
皮肤病学 | 134篇 |
神经病学 | 159篇 |
特种医学 | 135篇 |
外科学 | 375篇 |
综合类 | 5篇 |
预防医学 | 102篇 |
眼科学 | 26篇 |
药学 | 180篇 |
中国医学 | 2篇 |
肿瘤学 | 292篇 |
出版年
2023年 | 12篇 |
2022年 | 23篇 |
2021年 | 46篇 |
2020年 | 38篇 |
2019年 | 35篇 |
2018年 | 54篇 |
2017年 | 39篇 |
2016年 | 39篇 |
2015年 | 57篇 |
2014年 | 79篇 |
2013年 | 80篇 |
2012年 | 119篇 |
2011年 | 134篇 |
2010年 | 79篇 |
2009年 | 72篇 |
2008年 | 113篇 |
2007年 | 114篇 |
2006年 | 110篇 |
2005年 | 127篇 |
2004年 | 171篇 |
2003年 | 157篇 |
2002年 | 146篇 |
2001年 | 77篇 |
2000年 | 82篇 |
1999年 | 63篇 |
1998年 | 38篇 |
1997年 | 33篇 |
1996年 | 35篇 |
1995年 | 19篇 |
1994年 | 22篇 |
1993年 | 17篇 |
1992年 | 43篇 |
1991年 | 46篇 |
1990年 | 67篇 |
1989年 | 36篇 |
1988年 | 42篇 |
1987年 | 29篇 |
1986年 | 36篇 |
1985年 | 39篇 |
1984年 | 19篇 |
1983年 | 11篇 |
1982年 | 15篇 |
1981年 | 15篇 |
1980年 | 8篇 |
1979年 | 12篇 |
1978年 | 8篇 |
1972年 | 9篇 |
1971年 | 8篇 |
1968年 | 8篇 |
1966年 | 9篇 |
排序方式: 共有2735条查询结果,搜索用时 328 毫秒
1.
2.
Y Miyasaka M Sakurai A T Yokobori S Kuroda M Ohyama 《Bio-medical materials and engineering》1991,1(1):3-10
Long bone injuries in clinical cases are studied by comparison of roentgenograms with a rational mechanical analysis of the injuries. Fractures produced by torsional loads have a spiral shape with a smooth and even surface. Fractures induced by bending loads have uneven and rugged fracture surfaces perpendicular to the bone axis. Long bones are weak in torsion but strong in tensile stress produced by bending. This result corresponds to the clinical fact that a large direct external force is needed to produce a transverse fracture while a spiral fracture is produced by a relatively small torque. 相似文献
3.
4.
Skip mediastinal nodal metastases in non-small cell lung cancer 总被引:1,自引:0,他引:1
Fumihiro Tanaka Kazumasa Takenaka Hiroki Oyanagi Takuji Fujinaga Yosuke Otake Kazuhiro Yanagihara Harumi Ito Hiromi Wada 《European journal of cardio-thoracic surgery》2004,25(6):744-1120
Objective: To reveal the incidence and clinical significance of mediastinal nodal metastases without N1-station nodal metastases (‘skip-N2 metastases’) in non-small cell lung cancer (NSCLC). Methods: A total of 450 NSCLC patients who underwent tumor resection with a systemic mediastinal nodal dissection were retrospectively reviewed. p53 status and proliferative activity represented as proliferative index (PI) were also examined immunohistochemically. Results: Skip-N2 metastases were documented in 49 (13%) patients of all 450 patients; among 334 patients without N1-nodal involvement, 18% patients had skip-N2 metastases. The postoperative survival of skip-N2 patients was almost same as that for patients with metastases to both N1 and N2 nodes. Skip-N2 metastases were significantly more frequent in male patients and squamous cell carcinoma patients. In addition, the mean PI for tumor with skip-N2 metastases was significantly higher than that for any other pathologic nodal (pN)-status diseases. Combined with histologic type and PI, the incidences of skip-N2 metastases for adenocarcinoma showing lower PI were only 5% (7/137) of all patients and 7% (7/94) of patients without N1-nodal involvement. Conclusions: N1 nodal status is not a useful predictor of N2 nodal status in NSCLC, because skip-N2 metastases were documented in 18% patients showing no N1-nodal involvement. However, N1 node-guided dissection might be performed in patients with adenocarcinoma showing lower PI, because the incidence of skip-N2 metastases was extremely low. 相似文献
5.
Enkhtuvshin Gereltzul Yoshiyuki Baba Kimie Ohyama 《The Cleft palate-craniofacial journal》2005,42(6):679-686
OBJECTIVE: To investigate the eruption pattern of the cleft-side canine regarding its pre-eruption position relative to the cleft in bone-grafted (BG) and nongrafted (NonBG) patients with cleft lip and palate. METHODS: Fifty-three patients with cleft lip and palate (21 BG, 32 NonBG) were examined by panoramic radiography and posteroanterior cephalography taken before and after canine eruption. Subjects were categorized into BG, NonBG, and control groups. Canines at the pre-eruption stage were categorized as close to (group 1) or distant from (group 2) the cleft area. The canine angle and its change between the two stages were evaluated. RESULTS: No significant differences were noted between the initial canine angle of the BG and NonBG groups. Although canines in the BG group erupted without a significant change in angle, the canine angle increased significantly (p < .0001) in the NonBG and control groups. In group 1, a greater change in canine angle was noted in the NonBG (p < .05) and control (p < .01) groups than in the BG group. In group 2, no significant difference was noted among the three groups. CONCLUSIONS: In BG patients, a canine located near the cleft appears to erupt at the same angle as it had before grafting. However, in NonBG patients, it erupts more vertically, guided by cortical bone. For canines distant from the cleft area, there is no significant difference in the change in angulation between NonBG and BG patients. 相似文献
6.
7.
8.
M Kurihara S Shimauchi K Ohyama T Yamakawa H Watanabe S Hirakawa S Ohkuma 《Yakugaku zasshi : Journal of the Pharmaceutical Society of Japan》1990,110(10):783-787
One mol perchloric acid-soluble fraction (PASF) obtained from ascitic fluid of a patient (blood group B) with metastatic omentum tumor from ovarian cancer was a glycoprotein fraction containing 35.4% carbohydrate and exhibited A, B and Thomsen-Friedenreich (T) activities. This fraction was separated into three fractions, Frs. 1-3, by a gel filtration with Bio-Gel A-1.5 m column. Among these fractions, Fr. 1 which was obtained in a 5.5% yield to PASF, was a glycoprotein fraction with a high molecular weight, 23.3% carbohydrate and A, B and T activities. Other minor fraction, Fr. 2, and the major fraction, Fr. 3, contained 43.2% and 43.9% carbohydrate, but did not show A, B and T activities, respectively. 相似文献
9.