全文获取类型
收费全文 | 6751篇 |
免费 | 709篇 |
国内免费 | 12篇 |
专业分类
耳鼻咽喉 | 54篇 |
儿科学 | 187篇 |
妇产科学 | 125篇 |
基础医学 | 912篇 |
口腔科学 | 216篇 |
临床医学 | 784篇 |
内科学 | 1081篇 |
皮肤病学 | 218篇 |
神经病学 | 893篇 |
特种医学 | 373篇 |
外科学 | 1076篇 |
综合类 | 119篇 |
一般理论 | 4篇 |
预防医学 | 629篇 |
眼科学 | 70篇 |
药学 | 372篇 |
中国医学 | 2篇 |
肿瘤学 | 357篇 |
出版年
2021年 | 94篇 |
2020年 | 73篇 |
2019年 | 95篇 |
2018年 | 130篇 |
2017年 | 94篇 |
2016年 | 100篇 |
2015年 | 115篇 |
2014年 | 160篇 |
2013年 | 222篇 |
2012年 | 299篇 |
2011年 | 303篇 |
2010年 | 182篇 |
2009年 | 177篇 |
2008年 | 275篇 |
2007年 | 291篇 |
2006年 | 303篇 |
2005年 | 292篇 |
2004年 | 300篇 |
2003年 | 275篇 |
2002年 | 270篇 |
2001年 | 270篇 |
2000年 | 265篇 |
1999年 | 227篇 |
1998年 | 86篇 |
1997年 | 60篇 |
1996年 | 82篇 |
1995年 | 77篇 |
1994年 | 78篇 |
1993年 | 69篇 |
1992年 | 160篇 |
1991年 | 175篇 |
1990年 | 151篇 |
1989年 | 139篇 |
1988年 | 118篇 |
1987年 | 125篇 |
1986年 | 90篇 |
1985年 | 99篇 |
1984年 | 86篇 |
1982年 | 49篇 |
1980年 | 47篇 |
1979年 | 66篇 |
1978年 | 54篇 |
1977年 | 51篇 |
1976年 | 58篇 |
1975年 | 70篇 |
1974年 | 62篇 |
1973年 | 61篇 |
1972年 | 64篇 |
1971年 | 50篇 |
1967年 | 40篇 |
排序方式: 共有7472条查询结果,搜索用时 15 毫秒
991.
Comparison of methods for detecting medication errors in 36 hospitals and skilled-nursing facilities. 总被引:8,自引:0,他引:8
Elizabeth A Flynn Kenneth N Barker Ginette A Pepper David W Bates Robert L Mikeal 《American journal of health-system pharmacy》2002,59(5):436-446
The validity and cost-effectiveness of three methods for detecting medication errors were examined. A stratified random sample of 36 hospitals and skilled-nursing facilities in Colorado and Georgia was selected. Medication administration errors were detected by registered nurses (R.N.s), licensed practical nurses (L.P.N.s), and pharmacy technicians from these facilities using three methods: incident report review, chart review, and direct observation. Each dose evaluated was compared with the prescriber's order. Deviations were considered errors. Efficiency was measured by the time spent evaluating each dose. A pharmacist performed an independent determination of errors to assess the accuracy of each data collector. Clinical significance was judged by a panel of physicians. Observers detected 300 of 457 pharmacist-confirmed errors made on 2556 doses (11.7% error rate) compared with 17 errors detected by chart reviewers (0.7% error rate), and 1 error detected by incident report review (0.04% error rate). All errors detected involved the same 2556 doses. All chart reviewers and 7 of 10 observers achieved at least good comparability with the pharmacist's results. The mean cost of error detection per dose was $4.82 for direct observation and $0.63 for chart review. The technician was the least expensive observer at $2.87 per dose evaluated. R.N.s were the least expensive chart reviewers at $0.50 per dose. Of 457 errors, 35 (8%) were deemed potentially clinically significant; 71% of these were detected by direct observation. Direct observation was more efficient and accurate than reviewing charts and incident reports in detecting medication errors. Pharmacy technicians were more efficient and accurate than R.N.s and L.P.N.s in collecting data about medication errors. 相似文献
992.
993.
994.
995.
Composite tissue allotransplantation of the hand and face: a new frontier in transplant and reconstructive surgery 总被引:3,自引:0,他引:3
Brian Gander Charles S. Brown Dalibor Vasilic Allen Furr Joseph C. Banis Jr Michael Cunningham Osborne Wiggins Claudio Maldonado Iain Whitaker Gustavo Perez-Abadia Johannes M. Frank John H. Barker 《Transplant international》2006,19(11):868-880
Each year an estimated 7-million people in the USA need composite tissue reconstruction because of surgical excision of tumors, accidents and congenital malformations. Limb amputees alone comprise over 1.2 million of these. This figure is more than double the number of solid organs needed for transplantation. Composite tissue allotransplantation in the form of hand and facial tissue transplantation are now a clinical reality. The discovery, in the late 1990s, that the same immunotherapy used routinely in kidney transplantation was also effective in preventing skin rejection made this possible. While these new treatments seem like major advancements most of the surgical, immunological and ethical methods used are not new at all and have been around and routinely used in clinical practice for some time. In this review of composite tissue allotransplantation, we: (i) outline the limitations of conventional reconstructive methods for treating severe facial disfigurement, (ii) review the history of composite tissue allotransplantation, (iii) discuss the chronological scientific advances that have made it possible, (iv) focus on the two unique clinical scenarios of hand and face transplantation, and (v) reflect on the critical issues that must be addressed as we move this new frontier toward becoming a treatment in mainstream medicine. 相似文献
996.
997.
998.
P. B. Barker S. J. Blackband J. C. Chatham B. J. Soher M. A. Samphilipo C. A. Magee J. D. Hilton J. D. Strandberg J. H. Anderson 《Magnetic resonance in medicine》1993,30(4):458-464
Quaintitative, single voxel proton nuclear magnetic resonance (NMR) spectroscopy and histological analysis was performed in eight dogs implanted with the transplantable canine glioma model of Wodinsky (Proc. Am. Assoc. Cancer Res. 10, 99 (1969). Signals from choline, creatine, N-Acetyl Aspartate (NAA) and lactate were converted to molar concentration units and correlated with the quantitative analysis of histologically determined tissue types within the localized volume selected for NMR spectroscopy. In general, compared with normal brain, the lesions were associated with reductions in all metabolite concentrations, with the exception of lactate, which was increased. NAA and creatine decreases were most significantly correlated with the total lesion volume (P < 0.01), suggesting that these compounds are present in normal brain only. Changes in choline levels did not correlate strongly with any particular tissue type. Lactate was found to increase with increasing total lesion volume (P < 0.01), but not with increasing percent tumor, suggesting that it accumulates in abnormal tissue other than the tumor. The spectra reported were similar to those observed in human glioblastomas, with the exception that elevations of choline were not observed. The transplant-able canine gliosarcoma system appears to be a suitable tumor model for evaluation by clinical radiological techniques such as magnetic resonance imaging (MRI) and proton NMR spectroscopy. 相似文献
999.
A telephone questionnaire was targeted at 189 paediatric senior house officers (SHOs) throughout England and Wales in order to evaluate their attitudes towards paediatrics and gain insight into methods by which recruitment could be improved in future years. A total of 152 senior house officers were interviewed. The group consisted mainly of general practice trainees, but included 51 career paediatricians. The majority were female (57%) and 44% were married. Our assessment revealed a perceived high work-load, but also showed that paediatrics remains a satisfying specialty. Training while in post was perceived as unsatisfactory by 32% of those questioned. Sixty per cent reported a decline in their social life since starting their post. Paediatrics was seen as the busiest of a number of specialties. This perception persisted, and in fact increased, between SHO and consultant grade. It is foreseen that this may lead to further problems in recruitment. 相似文献
1000.