全文获取类型
收费全文 | 12246篇 |
免费 | 537篇 |
国内免费 | 67篇 |
专业分类
耳鼻咽喉 | 89篇 |
儿科学 | 164篇 |
妇产科学 | 135篇 |
基础医学 | 1357篇 |
口腔科学 | 451篇 |
临床医学 | 773篇 |
内科学 | 3119篇 |
皮肤病学 | 274篇 |
神经病学 | 825篇 |
特种医学 | 653篇 |
外科学 | 2224篇 |
综合类 | 51篇 |
预防医学 | 368篇 |
眼科学 | 190篇 |
药学 | 879篇 |
中国医学 | 19篇 |
肿瘤学 | 1279篇 |
出版年
2023年 | 69篇 |
2022年 | 75篇 |
2021年 | 199篇 |
2020年 | 109篇 |
2019年 | 146篇 |
2018年 | 215篇 |
2017年 | 173篇 |
2016年 | 215篇 |
2015年 | 180篇 |
2014年 | 294篇 |
2013年 | 356篇 |
2012年 | 527篇 |
2011年 | 595篇 |
2010年 | 327篇 |
2009年 | 300篇 |
2008年 | 545篇 |
2007年 | 565篇 |
2006年 | 565篇 |
2005年 | 593篇 |
2004年 | 554篇 |
2003年 | 512篇 |
2002年 | 529篇 |
2001年 | 448篇 |
2000年 | 493篇 |
1999年 | 458篇 |
1998年 | 165篇 |
1997年 | 137篇 |
1996年 | 113篇 |
1995年 | 101篇 |
1994年 | 97篇 |
1993年 | 74篇 |
1992年 | 233篇 |
1991年 | 234篇 |
1990年 | 243篇 |
1989年 | 249篇 |
1988年 | 211篇 |
1987年 | 235篇 |
1986年 | 230篇 |
1985年 | 214篇 |
1984年 | 147篇 |
1983年 | 108篇 |
1979年 | 114篇 |
1978年 | 87篇 |
1977年 | 80篇 |
1975年 | 55篇 |
1974年 | 63篇 |
1973年 | 66篇 |
1972年 | 57篇 |
1969年 | 62篇 |
1968年 | 53篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
Masato Nakajima Koji Tsuchiya Yoshihiro Honda Hiroshi Koshiyama Tatsuho Kobayashi 《General thoracic and cardiovascular surgery》2009,57(12):654-656
Although the causes of stroke are diverse, thromboembolism due to a mobile aortic thrombus is rare. We describe a surgical
case of acute massive pulmonary embolism after critical cerebral infarction associated with a mobile ascending aortic thrombus
in a 52-year-old woman. Concomitant surgical removal of the aortic thrombus and pulmonary embolectomy was performed successfully,
and the patient has been stable without recurrent thromboembolic complications after 18 months of follow-up. 相似文献
43.
A prototype electronic radial scan ultrasound endoscope has been developed by Olympus (Tokyo, Japan) for endoscopic ultrasound (EUS) study. The ultrasound view‐angle of this model is 360° vertical to the scope. Though the diameter of the scanner and the shaft of the scope is bigger than those of the present mechanical radial scan model, clinical manipulation of the new scope is the same as that of the present model. Image quality of the ultrasound picture demonstrated by the electronic radial model was as clear as those provided by the mechanical radial scan model. Ultrasound penetration was better and satisfactory because of less echoic reduction compared to the mechanical radial model. The newly developed electronic radial model can be evaluated as an ultrasound endoscope for the next generation. The advantage of this system is to facilitate the clinical use of color Doppler function and tissue harmonic imaging, and this system can be operated by the same monitor unit as a convex model of ultrasound endoscope. 相似文献
44.
Type A aortic dissection: evaluation with ultrafast CT 总被引:3,自引:0,他引:3
45.
46.
Y Hayashi O Uchida O Takaki Y Ohnishi T Nakajima H Kataoka M Kuro 《Anesthesia and analgesia》1992,74(5):688-693
Central venous catheterization for pressure monitoring and drug administration is often important in the anesthetic management of infants undergoing cardiovascular surgery. We examined the effects of patient age, weight, and central venous pressure and the experience of the anesthesiologist on the rate of successful catheterization and catheterization time of the internal jugular vein (IJV) in a prospective study. We studied 106 infants undergoing IJV catheterization for cardiovascular surgery over a 7-mo period at our institution. We catheterized the IJV by the high approach. The direct venipuncture or the Seldinger method was used according to the patient's weight. Overall successful catheterization rate was 97.2%, and the average catheterization time was 353 +/- 21 s (mean +/- SEM). Complications included arterial puncture in 12 cases (11.3%), hematoma formation in four cases (3.8%), and catheter malposition in two cases (1.9%), but pneumothorax was not observed. When a patient was younger than 3 mo or weighed less than 4.0 kg, successful catheterization rate decreased significantly to 81.3% and 78.6%, respectively. Catheterization time was inversely correlated with both age and weight, whereas central venous pressure did not affect either successful catheterization rate or catheterization time. We were unable to demonstrate that the experience of the anesthesiologist plays a significant role in the success or complication of the catheterization procedure. Our results indicate that IJV catheterization by the high approach is a reliable and useful technique in infants, and that the weight and age of the patient significantly influence the rate of successful catheterization. 相似文献
47.
Toshiaki Tadai M.D. Hideko Kanai M.D Michihiko Nakamura M.D. Teruo Nakajima M.D. Mitsue Fujita M.D. Yoshihide Nakai M.D. 《Psychiatry and clinical neurosciences》1994,48(3):541-545
Abstract: The Self-Rating Body Image (SRBI) test was used to determine whether the patients with eating disorders such as anorexia nervosa or bulimia showed their body image disturbance or not. The SRBI was completed by 120 subjects who consisted of 30 low weight (LW) controls, 30 normal weight (NW) controls, 30 high weight (HW) controls, 18 anorexic patients (AN) and 12 bulimic patients (BN). The AN group had a significantly greater dissatisfaction with the scales of the body shape, visceral organ and face image of the SRBI than the weight-matched LW group. The BN group had a significantly greater dissatisfaction with the visceral organ image than the weight-matched NW group. However, no significant difference in the body shape and face images between the BN and NW groups was found. Our results suggest that the anorexic patients may disturb more parts of the body image than the bulimic patients though both the anorexic and bulimic patients showed the disturbance of body image. 相似文献
48.
Dr. Ichiro Shimoyama Yoshio Nakajima Toshihiko Ito Tadahiko Shibata 《Brain topography》1997,9(4):271-274
Summary We recorded visual evoked potentials (VEPs) elicited with high or low imaginable Chinese characters (HIC or LIC), representing concrete objects or absolute concepts, respectively. A closed circle (CC) acts as control stimulus. These were displayed (at 1.6° visual angle) for 35 ms on a TV monitor. Twenty-one channel VEPs (band-pas filter: 0.05–60 Hz), using balanced non-cephalic electrodes, were recorded from –100 to 924 ms for 11 right-handed male volunteers. The VEPs were analyzed by multivariate analysis of variance (MANOVA) and comparison of topographies at four remarkable peaks (P110, N160, P230 and N320). MANOVA showed significant differences (p< 0.001) for both conditions of channel and stimuli (HIC, LIC or CC). P100 for the CC-VEPs, N160 for the HIC-and LIC-VEPs, P230 for the CC-VEPs, and N320 for the HIC-VEPs were remarkable in the posterior scalp regions. Topographies at P100 and N160 showed no difference between the HIC-and LIC-stimuli. However, those at N320 showed difference between the HIC-and LIC-stimuli over the occipital and posterior temporal areas. Those results suggest that the responses at P100 and N160 might segregate Chinese characters from non Chinese characters. N320 suggested certain processes in imagery on recognizing Chinese characters over the occipital and posterior temporal areas.We are grateful to Dr. Yoshiji Kojima of Hamamatsu University for helpful comments. 相似文献
49.
50.