全文获取类型
收费全文 | 2088篇 |
免费 | 94篇 |
国内免费 | 11篇 |
专业分类
耳鼻咽喉 | 25篇 |
儿科学 | 26篇 |
妇产科学 | 35篇 |
基础医学 | 295篇 |
口腔科学 | 44篇 |
临床医学 | 173篇 |
内科学 | 455篇 |
皮肤病学 | 51篇 |
神经病学 | 147篇 |
特种医学 | 77篇 |
外科学 | 382篇 |
综合类 | 6篇 |
预防医学 | 52篇 |
眼科学 | 22篇 |
药学 | 141篇 |
中国医学 | 4篇 |
肿瘤学 | 258篇 |
出版年
2023年 | 7篇 |
2022年 | 24篇 |
2021年 | 49篇 |
2020年 | 22篇 |
2019年 | 32篇 |
2018年 | 42篇 |
2017年 | 35篇 |
2016年 | 27篇 |
2015年 | 39篇 |
2014年 | 41篇 |
2013年 | 66篇 |
2012年 | 133篇 |
2011年 | 148篇 |
2010年 | 71篇 |
2009年 | 56篇 |
2008年 | 112篇 |
2007年 | 122篇 |
2006年 | 125篇 |
2005年 | 115篇 |
2004年 | 110篇 |
2003年 | 87篇 |
2002年 | 84篇 |
2001年 | 63篇 |
2000年 | 73篇 |
1999年 | 67篇 |
1998年 | 25篇 |
1997年 | 17篇 |
1996年 | 14篇 |
1995年 | 16篇 |
1994年 | 21篇 |
1993年 | 14篇 |
1992年 | 34篇 |
1991年 | 39篇 |
1990年 | 23篇 |
1989年 | 31篇 |
1988年 | 25篇 |
1987年 | 22篇 |
1986年 | 16篇 |
1985年 | 16篇 |
1984年 | 17篇 |
1983年 | 17篇 |
1982年 | 7篇 |
1979年 | 6篇 |
1976年 | 8篇 |
1973年 | 5篇 |
1971年 | 6篇 |
1970年 | 7篇 |
1969年 | 5篇 |
1968年 | 14篇 |
1967年 | 8篇 |
排序方式: 共有2193条查询结果,搜索用时 15 毫秒
1.
Soichiro Yoshida Tetsuo Hayashi Makoto Morozumi Hisato Osada Norinari Honda Takumi Yamada 《International journal of urology》2007,14(7):665-667
The incidence of stonestreet formation after extracorporeal shock wave lithotripsy (ESWL) rises with increasing stone burden. However, stonestreet after ESWL is often experienced even in stones smaller than 20 mm. To examine whether the non-contrast helical computed tomography (CT) data could predict stonestreet formation in these stones, 53 radiopaque stones of 5-20 mm treated with ESWL were evaluated. Maximal dimension was measured on plain radiograph. From an attenuation value histogram graphed from the CT data, total stone volume and mean attenuation value were calculated. Seven stonestreets longer than 25 mm developed. There was no significant difference in maximal dimension and total stone volume between stones that did and stones that did not develop stonestreet. Mean attenuation value was the sole significant predictive factor. Application of mean attenuation value with cut-off level of 650 HU would anticipate stonestreet formation with a sensitivity of 85.7% and a specificity of 71.7%. The estimated risk of stonestreet formation is high in the treatment of stones with higher mean attenuation value. 相似文献
2.
3.
4.
5.
Bladder function in elderly men with subclinical brain magnetic resonance imaging lesions. 总被引:1,自引:0,他引:1
Among 43 men more than 60 years old who complained of urinary irritative symptoms 40 had subclinical lesions in the brain on magnetic resonance imaging (MRI). Of these 40 patients 23 (57.5%) had detrusor hyperreflexia. The mean age of the patients with and without detrusor hyperreflexia was 75.8 and 68.2 years, respectively, which is a statistically significant difference. Patients with detrusor hyperreflexia were more likely to have lesions of the basal ganglia than patients without detrusor hyperreflexia. This study suggests that detrusor hyperreflexia, subclinical MRI lesions in the brain and aging are intimately interrelated. 相似文献
6.
Safety evaluation of surgical materials by cytotoxicity testing 总被引:2,自引:1,他引:1
The cytotoxicity of three kinds of commercially available absorbable hemostats [oxidized cellulose (Surgicel, gauze and cotton
types), microfibrillar collagen (Avitene), and cotton-type collagen (Integran)] and one adhesion barrier [sodium hyaluronate
and carboxymethyl-cellulose membrane (Seprafilm)] were comparatively assessed by a colony assay using V79 cells and a minimum
essential medium (MEM) elution assay in combination with a neutral red assay using L929 cells. Strong cytotoxicity was detected
for Surgicel by both the MEM elution assay and the colony assay. For Avitene, both methods revealed weak cytotoxicity. For
Seprafilm, no cytotoxicity was detected by the MEM elution assay, while a moderate degree of cytotoxicity was observed in
the colony assay. For Integran cytotoxicity was not detected by either the MEM elution or the colony assay. The results of
the different methods showed some inconsistency in terms of the degree of cytotoxicity of the materials. It is proposed that
the combination of two or more sensitive cytotoxicity testing methods for the evaluation of biomaterials is necessary to avoid
false-negative results for biomaterials at the preclinical stage. Furthermore, investigation of the correlation between the
cytotoxicity and the extraction period of the surgical materials is helpful for predicting the effect of prolonged in vivo
use of biomaterials on surrounding cells, tissues, and organs. 相似文献
7.
Mitsuru Masaki Tadashi Kuroda Naoki Hosen Hisao Hirota Kazuo Terai Yuichi Oshima Yoshikazu Nakaoka Shoko Sugiyama Ryusuke Kimura Satoshi Yoshihara Manabu Kawakami Norishige Iizuka Yasuhiko Tomita Hiroyasu Ogawa Ichiro Kawase Keiko Yamauchi-Takihara 《Journal of the American Society of Echocardiography》2004,17(4):397-398
A 57-year-old man with a history of renal cell carcinoma presented with presyncope. He underwent nephrectomy years earlier followed by HLA-matched allogeneic peripheral-blood stem-cell transplantation. Echocardiographic investigation revealed a solitary right ventricle mass without contiguous vena caval or right atrial involvement. The mass was pathologically confirmed to be metastatic carcinoma in the right ventricular cavity. This case highlights the need to consider an underlying neoplastic syndrome in patients presenting isolated right ventricle mass by echocardiography. 相似文献
8.
K Baba M Yajima N Ohyama T Iwamoto T Osada T Inoue T Shinagawa 《Hinyokika kiyo. Acta urologica Japonica》1990,36(12):1467-1470
Metastatic tumor of the penis is uncommon and only 95 cases have been reported in Japan. A 70-year-old man, who had squamous cell carcinoma of the lower pharynx, complained of urethral induration. Biopsy was performed and pathological diagnosis was metastatic tumor of penis originating from the lower pharynx. Although partial response in tumor size was noted by irradiation therapy, the patient died of multiple metastases in the 4th month after the diagnosis. This case is the first report of metastatic penile tumor originating from the lower pharynx. 相似文献
9.
10.
OBJECTIVE: We investigate the synaptic factor for the recovery function of evoked responses using a repetitive stimulation technique. METHODS: Somatosensory evoked cortical magnetic field (SEF) was recorded following stimulation of the median nerve using single to 6-train stimulation in 8 healthy subjects. The SEF responses after each stimulus in the train stimulation were extracted by subtraction of the waveforms. RESULTS: An attenuation of the SEF components was recognized after the second of the stimuli, but there was no significant attenuation with the third or later stimulations. The root mean square (RMS) of the 1M (peak latency at 20 ms after stimulation) and 4M (70 ms) components were smaller than that of the single stimulation during the train stimulation, while the 2M (30 ms) and 3M (45 ms) components were not attenuated, but the 3M was facilitated at the fourth to sixth stimulation. CONCLUSION: The synaptic factor was not responsible for the attenuation of the SEF components during repetitive stimulation in healthy subjects. The SEF change disclosed a functional difference among the SEF components during the train stimulation, especially among the later components. 相似文献