全文获取类型
收费全文 | 8457篇 |
免费 | 412篇 |
国内免费 | 139篇 |
专业分类
耳鼻咽喉 | 35篇 |
儿科学 | 274篇 |
妇产科学 | 114篇 |
基础医学 | 1138篇 |
口腔科学 | 134篇 |
临床医学 | 1032篇 |
内科学 | 1248篇 |
皮肤病学 | 31篇 |
神经病学 | 365篇 |
特种医学 | 270篇 |
外国民族医学 | 1篇 |
外科学 | 807篇 |
综合类 | 703篇 |
现状与发展 | 1篇 |
预防医学 | 1141篇 |
眼科学 | 41篇 |
药学 | 1297篇 |
1篇 | |
中国医学 | 199篇 |
肿瘤学 | 176篇 |
出版年
2023年 | 78篇 |
2022年 | 173篇 |
2021年 | 301篇 |
2020年 | 230篇 |
2019年 | 233篇 |
2018年 | 253篇 |
2017年 | 219篇 |
2016年 | 219篇 |
2015年 | 233篇 |
2014年 | 431篇 |
2013年 | 625篇 |
2012年 | 344篇 |
2011年 | 424篇 |
2010年 | 359篇 |
2009年 | 353篇 |
2008年 | 358篇 |
2007年 | 368篇 |
2006年 | 329篇 |
2005年 | 260篇 |
2004年 | 259篇 |
2003年 | 226篇 |
2002年 | 222篇 |
2001年 | 198篇 |
2000年 | 170篇 |
1999年 | 166篇 |
1998年 | 143篇 |
1997年 | 138篇 |
1996年 | 155篇 |
1995年 | 143篇 |
1994年 | 141篇 |
1993年 | 88篇 |
1992年 | 116篇 |
1991年 | 105篇 |
1990年 | 66篇 |
1989年 | 71篇 |
1988年 | 78篇 |
1987年 | 48篇 |
1986年 | 65篇 |
1985年 | 107篇 |
1984年 | 74篇 |
1983年 | 34篇 |
1982年 | 57篇 |
1981年 | 48篇 |
1980年 | 47篇 |
1979年 | 48篇 |
1978年 | 29篇 |
1977年 | 27篇 |
1976年 | 38篇 |
1975年 | 18篇 |
1973年 | 28篇 |
排序方式: 共有9008条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
目的 了解解放军总医院抗震颤麻痹药物的应用情况与用药趋势。方法 采用世界卫生组织(WHO)推荐的以限定日剂量(DDD)为指标的分析方法,对2015-2017年解放军总医院抗震颤麻痹药物的销售金额、用药频度(DDDs)、日均费用(DDC)及排序比(B/A)等进行统计分析。结果 普拉克索、多巴丝肼和恩他卡朋的用药金额始终处于前3位,普拉克索的用药金额逐渐上升,卡比多巴/左旋多巴的用药金额逐渐下降;DDDs排序列前2位的是多巴丝肼和司来吉兰,多巴丝肼的DDDs逐年上升,一直处于第1位;2015-2016年各种抗震颤麻痹药物的DDC较为稳定,2016-2017年各种抗震颤麻痹药物的DDC开始略有下降;除普拉克索和恩他卡朋的B/A始终小于1.00,其他抗震颤麻痹药物的B/A均在1.00以上波动。结论 解放军总医院抗震颤麻痹药物的使用较为合理,其中多巴丝肼、普拉克索和司来吉兰具有很好的市场前景。 相似文献
5.
多巴胺或多巴胺复合去甲肾上腺素对肝移植术中患者血液动力学、氧代谢及肾功能的影响 总被引:3,自引:0,他引:3
目的评价原位肝脏移植术(OLT)中持续输注多巴胺或多巴胺复合去甲肾上腺素对血液动力学、组织氧代谢和肾功能的影响。方法拟行OLT的患者30例,ASAⅢ或Ⅳ级,随机分为2组 (n=15)。A组:术中持续输注多巴胺,初始输注速率为1-3μg·kg-1·min-1;B组:术中持续输注多巴胺复合去甲肾上腺素,初始输注速率分别为1-3μg·kg-1·min-1和0.03μg·kg-1·min-1,多巴胺输注速率不超过5μg·kg-1·min-1;术中两组均调节输注速率维持MAP 60-80 mm Hg。分别于切皮前即刻、切肝期1 h、无肝期1 h、新肝期1h和术毕测定血液动力学、组织代谢和肾功能指标。结果两组HR、 MAP均维持较平稳。无肝期两组CVP、MPAP、PAWP、CO、CI、DO2、VO2降低(P<0.05);SVR和SVRI升高(P<0.05),但均在正常范围内。术中PVR、PVRI、pH及SvO2均较平稳。乳酸浓度增高并持续到术毕。两组术中Cr和BUN均在正常范围,B组总尿量高于A组(P相似文献
6.
N. Sinis H. O. Rennekampff M. Haerle H. -E. Schaller 《European journal of plastic surgery》2006,28(8):507-512
Intraoperative and postoperative free flap monitoring by means of oxygen tension measurement was carried out in 11 patients. We used an invasive flexible microcatheter that allowed for measurement of oxygen tension in all types of free flaps. Two cases of the measured flaps were buried free flaps which do not allow monitoring by clinical assessment. All flaps monitored in this study survived. One case of displacement of the microcatheter occurred. In one patient, the tissue pO2 monitor successfully detected early vascular thrombosis with subsequent reoperation and salvage of the free flap. 相似文献
7.
8.
9.
Stephen R. Thomas Ronald G. Pratt Ronald W. Millard R. C. Samaratunga Yoseph Shiferaw Leland C. Clark Richard E. Hoffmann 《Journal of magnetic resonance imaging : JMRI》1994,4(4):631-635
Oxygen-sensitive F-19 magnetic resonance imaging of perfluorocarbon compounds requires that fluorocarbon T1 changes correlate with the local Po2 and not with the composition of the surrounding aqueous phase. The influence of various bioconstituents and paramagnetic ions within the aqueous phase on the F-19 fluorocarbon phase T1 for PFC emulsions was evaluated at 0.14 and 0.66 T. T1 was measured for FC-43, perflubron, and a fluorinated surfactant. Controlled variables introduced in the aqueous phase included annex solution constituents, blood, pH changes, and Gd-DTPA. For a constant Po2, the F-19 T1s were independent of the emulsion constituents, blood concentration, and pH. For FC-43 and perflubron, F-19 T1 was independent of the Gd-DTPA concentration, while the aqueous phase T1 decreased by more than an order of magnitude. XMO-10 (smallest emulsion particle size) showed a slight decrease in F-19 T1 with increasing Gd-DTPA concentration at 0.66 T. 相似文献
10.
Introduction and Aims. Different self‐report methods tend to produce different estimates of alcohol consumption. The present study compares differences in rates and risk levels based on responses to a modified version of the Daily Drinking Questionnaire (m‐DDQ) and quantity‐frequency (QF) questions. Design and Methods. The sample comprised 2082 university students, 61% of whom were female and 39% male with a mean age of 23.5 years. An email containing an online link to a brief six‐question survey was emailed to students enrolled in participating faculties at the University of Wollongong, Australia. Current drinkers completed m‐DDQ and QF questions about alcohol consumption. Results. QF methods identified significantly lower estimates of consumption (Mean = 9.15, SD = 12.51) compared with m‐DDQ (Mean = 13.06, SD = 14.07). Allocation to risk categories based on the Australian Alcohol Guidelines were conducted for both the m‐DDQ and QF methods. Almost twice as many students were found to be drinking at levels considered risky using the m‐DDQ method compared with QF. In addition, the relative rank order of participants varied significantly between the two methods. Discussion and Conclusions. The m‐DDQ method identified higher rates of drinking and categorised almost twice as many individuals into risky categories of drinking compared with QF. Such variations have major implications for identification of risk groups in health promotion or prevention programs.[Utpala‐Kumar R, Deane FP. Rates of alcohol consumption and risk status among Australian university students vary by assessment questions. Drug Alcohol Rev 2009] 相似文献