全文获取类型
收费全文 | 17274篇 |
免费 | 1083篇 |
国内免费 | 162篇 |
专业分类
耳鼻咽喉 | 207篇 |
儿科学 | 362篇 |
妇产科学 | 171篇 |
基础医学 | 2179篇 |
口腔科学 | 258篇 |
临床医学 | 1329篇 |
内科学 | 4838篇 |
皮肤病学 | 327篇 |
神经病学 | 1139篇 |
特种医学 | 707篇 |
外科学 | 2421篇 |
综合类 | 215篇 |
一般理论 | 21篇 |
预防医学 | 1177篇 |
眼科学 | 377篇 |
药学 | 1046篇 |
中国医学 | 61篇 |
肿瘤学 | 1684篇 |
出版年
2023年 | 98篇 |
2022年 | 220篇 |
2021年 | 367篇 |
2020年 | 251篇 |
2019年 | 364篇 |
2018年 | 403篇 |
2017年 | 370篇 |
2016年 | 432篇 |
2015年 | 480篇 |
2014年 | 599篇 |
2013年 | 725篇 |
2012年 | 1216篇 |
2011年 | 1153篇 |
2010年 | 714篇 |
2009年 | 563篇 |
2008年 | 1094篇 |
2007年 | 1212篇 |
2006年 | 1091篇 |
2005年 | 1126篇 |
2004年 | 984篇 |
2003年 | 1065篇 |
2002年 | 995篇 |
2001年 | 232篇 |
2000年 | 204篇 |
1999年 | 222篇 |
1998年 | 205篇 |
1997年 | 201篇 |
1996年 | 164篇 |
1995年 | 151篇 |
1994年 | 114篇 |
1993年 | 97篇 |
1992年 | 132篇 |
1991年 | 110篇 |
1990年 | 99篇 |
1989年 | 107篇 |
1988年 | 82篇 |
1987年 | 72篇 |
1986年 | 74篇 |
1985年 | 74篇 |
1984年 | 53篇 |
1983年 | 59篇 |
1982年 | 41篇 |
1981年 | 41篇 |
1980年 | 37篇 |
1979年 | 38篇 |
1978年 | 34篇 |
1977年 | 54篇 |
1976年 | 30篇 |
1974年 | 29篇 |
1973年 | 28篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
When stimulating the mixed nerve to record evoked potential, both sensory and motor fibers are activated before entering the spinal cord. The N10 potential has been described as an antidromic motor evoked potential based on results obtained by recording at the anterior midneck. In the present study, we examined the changes in latencies of Erb's potential, N10, and N13 by stimulating the median nerve distally at the wrist and proximally at the elbow. The conduction velocity of N10 calculated by the difference between N10 latencies at the two stimulation points was consistent with motor conduction velocity, although N13 conduction velocity estimated by the same method reflected a sensory conduction velocity. A positive relation was also observed between the indirect latency from the stimulation point to the anterior root as calculated using the equation (F - M - 1) / 2 (ms) and the direct latency to the negative peak of the N10 potential. Our data support the notion that N10 represents antidromic motor potential originating in the spinal entry zone of the anterior root. 相似文献
32.
33.
34.
Shigeki Ohgitani Akimitsu Miyauchi Yasuyuki Takagi Yoshio Fujii Takuo Fujita Misa Nakamura Zhi-qiang Zhang Liang Shan Mitsuyo Sasaki Ryuichi Tsukino Toyoharu Yokoi Kennichi Kakudo Tomitaka Nakayama Junya Toguchida Hiroshi Kanoe Shinichi Aizawa Masao S. Sasaki Takashi Nakamura M. Suda K. Tanaka Y. Ogawa N. Tamura A. Yasoda H. Itoh M. Uehira N. Nishimoto T. Takigawa K. Shiota K. Nakao 《Journal of bone and mineral metabolism》1997,15(3):165-171
35.
Peter Reimer Sanjay Saini Ken K. Kwong Mark S. Cohen Ralph Weissleder Thomas J. Brady 《Journal of magnetic resonance imaging : JMRI》1994,4(3):331-335
To develop guidelines for clinical magnetic resonance imaging of the liver, the authors undertook an animal study to investigate the effect of dose and pulse sequence on liver signal intensity in gadopentetate dimeglumine—enhanced echo-planar imaging. Serial imaging of the liver was performed in anesthetized rats after intravenous administration of five different doses (0.01, 0.05, 0.1, 0.2, and 0.5 mmol/kg) of contrast agent, with six different pulse sequences. The results show that gadopentetate dimeglumine—enhanced echo-planar images obtained during the perfusion phase can yield either positive (due to increased T1 relaxation rates) or negative (due to susceptibility-induced increased T2 relaxation rates) liver enhancement depending on choice of pulse sequence and dose. At the current clinically recommended dose of 0.1 mmol/kg, maximal liver signal enhancement was seen with a T1-weighted inversion-recovery sequence, while maximal liver signal diminution was seen with a T2*-weighted gradient-echo sequence. The authors conclude that gadopentetate dimeglumine—enhanced echo-planar imaging can provide T1, T2, and T2* contrast that may be exploited for both lesion detection and lesion characterization. 相似文献
36.
37.
Masayuki Imamura Yutaka Shimada Yuhji Kanda Manabu Fukumoto Ken Yanagibashi Tokiharu Miyahara Takayoshi Tobe 《Surgery today》1992,22(5):409-415
In order to decrease the perioperative complications by preoperative cisplatin chemotherapy, the preoperative single administration of cisplatin (30 mg/m2) was performed weekly from one to six times in 36 consecutive patients with esophageal cancer classified as higher than Stage II. The survival curve of 17 patients in Stage III was significantly better (P<0.05) than that of patients who had been treated without preoperative cisplatin treatment. In 3 of the 12 patients who had locally invasive cancer, either the main tumors or the metastatic lymph nodes, which had invaded the trachea or the left main bronchus, sufficiently receded, so that a curative esophagectomy became possible; 2 of them have survived over 33 months while 1 died of pneumonia 33 months after surgery. The number of perioperative complications was minimal, and thus, we consider that the postoperative use of cisplatin and fluorouracil is indicated in patients in whom a histological response is noted in the resected specimens.This work was partially supported by Grant No. 02454315 from the Japanese Ministry of Education 相似文献
38.
Clinical Evaluation of a New Type of Centrifugal Pump 总被引:2,自引:0,他引:2
J. Ninomiya T. Shoji S. Tanaka M. Ikeshita M. Ochi S. Yamauchi T. Yajima H. Yamauchi T. Sugimotox T. Aizawa 《Artificial organs》1994,18(9):702-705
Abstract: The major problems with existing centrifugal pumps are leakage, mechanical trauma, and thrombus formation. In consideration of these problems, a new compact centrifugal pump system was developed. The purpose of this study was to evaluate the new centrifugal pump system clinically. Ten patients underwent open heart surgery with a centrifugal pump or a roller pump. During surgery, hemodynamic and hematological data were obtained. A pulsatile assist device in the pump circuit was used in patients with severe heart disease. There was neither operative death nor hospital mortality, and there was no difference with regard to hemodynamic data between the two groups. The centrifugal pump group, however, had significantly lower hemolysis, especially during prolonged cardiopulmonary bypass. This centrifugal pump could also create sufficient pulsatile flow with a pulsatile assist device. Postoperative macroscopic and microscopic findings demonstrated the smooth surface of the pump without thrombus formation. This centrifugal pump system might be useful for prolonged cardiopulmonary bypass. 相似文献
39.
40.