全文获取类型
收费全文 | 573篇 |
免费 | 19篇 |
国内免费 | 9篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 29篇 |
妇产科学 | 1篇 |
基础医学 | 56篇 |
口腔科学 | 10篇 |
临床医学 | 23篇 |
内科学 | 147篇 |
皮肤病学 | 8篇 |
神经病学 | 6篇 |
特种医学 | 82篇 |
外科学 | 46篇 |
综合类 | 122篇 |
预防医学 | 18篇 |
眼科学 | 2篇 |
药学 | 17篇 |
肿瘤学 | 33篇 |
出版年
2023年 | 2篇 |
2022年 | 3篇 |
2021年 | 30篇 |
2020年 | 6篇 |
2019年 | 8篇 |
2018年 | 4篇 |
2017年 | 2篇 |
2016年 | 5篇 |
2015年 | 10篇 |
2014年 | 10篇 |
2013年 | 8篇 |
2012年 | 11篇 |
2011年 | 18篇 |
2010年 | 24篇 |
2009年 | 24篇 |
2008年 | 29篇 |
2007年 | 18篇 |
2006年 | 24篇 |
2005年 | 14篇 |
2004年 | 18篇 |
2003年 | 12篇 |
2002年 | 10篇 |
2001年 | 9篇 |
2000年 | 6篇 |
1999年 | 13篇 |
1998年 | 32篇 |
1997年 | 24篇 |
1996年 | 28篇 |
1995年 | 16篇 |
1994年 | 31篇 |
1993年 | 10篇 |
1992年 | 5篇 |
1990年 | 7篇 |
1989年 | 12篇 |
1988年 | 14篇 |
1987年 | 16篇 |
1986年 | 14篇 |
1985年 | 13篇 |
1984年 | 9篇 |
1983年 | 8篇 |
1982年 | 6篇 |
1981年 | 8篇 |
1980年 | 8篇 |
1979年 | 3篇 |
1978年 | 3篇 |
1977年 | 4篇 |
1976年 | 4篇 |
1975年 | 4篇 |
1969年 | 1篇 |
1961年 | 1篇 |
排序方式: 共有601条查询结果,搜索用时 0 毫秒
81.
Visibility of gallstone fragments at US and fluoroscopy: implications for monitoring gallstone lithotripsy 总被引:1,自引:0,他引:1
To assess the value of ultrasound (US), fluoroscopy, and spot radiography in the detection, counting, and measurement of gallstone fragments during lithotripsy, in vitro visibility studies were conducted on fragments from 20 stones. Fluoroscopic visibility was evaluated during and after lithotripsy on 185 fragments placed in an anthropomorphic phantom. Three US experiments were performed on the fragments to study the visibility of fragments as a function of size, the accuracy of the count with large numbers of fragments, and the ability of observers to detect and count fragments larger than both 4 mm and 5 mm. With fluoroscopy, fragment detection rates ranged from 20% (fragments larger than 2.5 mm) to 80% (fragments larger than 4.5 mm). With US, all fragments larger than 1.5 mm were detected, and US was significantly better than fluoroscopy and spot radiography for detection of fragments 2.5 mm or smaller. US was also more accurate than fluoroscopy (11% vs 59% error) in the assessment of the number of fragments. When fragments larger than 4 mm or 5 mm were being counted with US, 92% of the fragments were visualized. The results suggest that US is more accurate for monitoring gallstone lithotripsy than fluoroscopy or spot radiography. 相似文献
82.
U PODDAR Y CHAWLA RK DHIMAN K VAIPHEI RK VASISHTA JB DILAWARI 《Journal of gastroenterology and hepatology》1998,13(1):109-111
Ascites may be associated with fulminant hepatic failure (FHF), but spontaneous bacterial peritonitis (SBP) is an extremely rare complication. We report on two patients with FHF who developed SBP. One patient died and the other recovered. 相似文献
83.
84.
1. Ketamine has a number of effects that suggest that it may interact with α- and β-adrenoceptors. To date, the experimental evidence for this has been indirect and has been based on physiological studies using competitive blocking agents. In the present study we sought to determine from receptor binding studies whether ketamine binds directly to α- and β-adrenoceptors. 2. Membrane preparations o. α1- and β2-adrenergic binding sites were obtained from urinary bladder and urethrae of sheep. These binding sites were characterized by saturation analyses using [3H]-prazosin for α1-adrenoceptor binding sites and [125I]-cyanopindolol (CYP) for the β2-adrenoceptor binding sites. The receptors were further characterized by displacement studies using selective and non-selective antagonists. 3. Studies in which ketamine was used to displac. [3H]-prazosin revealed a Kd of 3.40±1.23× 10?3 mol/L for ketamine binding to ai-adrenoceptors. Displacement studies of [125I]-CYP by ketamine showed a Kd of 0.35±0.03× 10?3 mol/L for ketamine binding to β2-adrenoceptors. 4. We conclude that ketamine interacts directly with both ai- an. β2-adrenoceptors and that such interactions probably explain the reported effects of this agent on the vasculature and the bronchial tree. 相似文献
85.
86.
87.
Computed tomographic study of hormone-secreting microadenomas 总被引:1,自引:0,他引:1
Hemminghytt S; Kalkhoff RK; Daniels DL; Williams AL; Grogan JP; Haughton VM 《Radiology》1983,146(1):65
88.
The advantages of delayed imaging and radiographic correlation in scintigraphic localization of gastrointestinal bleeding 总被引:1,自引:0,他引:1
Two cases in which gastrointestinal bleeding was localized by serial scintigraphic imaging with red blood cells labeled in vivo with 99mTc-PYP are reported. The importance of both early serial imaging and delayed imaging and of the correlation with other radiographic techniques is demonstrated. Reflux of blood from the sigmoid into the proximal colon was observed in both cases. In one case, contrast material injected into a resected specimen confirmed the scintigraphic localization of the site of bleeding. 相似文献
89.
90.
TWR Hansen B. Henrichsen RK Rasmussen A. Carling AB Andreassen O. Skjeldal 《Acta paediatrica (Oslo, Norway : 1992)》1996,85(10):1197-1201
Many galactosaemics appear to have neuropsychological and/or linguistic problems in spite of dietary treatment. Because the neonatal screening program in Norway does not include galactosaemia, we have re-examined Norwegian galactosaemics. Of 16 known patients, 8 patients participated in the study. They had been diagnosed between 2 and 11 weeks of age, and were between 9 months and 19 years old at the time of this study. All had very low or 0 activity of galactose-1-phosphate uridyl transferase. As part of the study all were examined neurologically, and had an age-appropriate developmental/IQ test, an ABR and an EEG, and a comprehensive psycholinguistic evaluation. The three youngest patients had normal developmental/IQ tests, while the five older patients had IQ scores in or below low range of normal. The majority had delayed language development and three patients were classified as having verbal dyspraxia. ABR and EEG showed mild pathology in the oldest patient only. Galactosaemia appears to be associated with significant risks of developmental and language delays in this unscreened population. 相似文献