全文获取类型
收费全文 | 45348篇 |
免费 | 3371篇 |
国内免费 | 135篇 |
专业分类
耳鼻咽喉 | 592篇 |
儿科学 | 1139篇 |
妇产科学 | 552篇 |
基础医学 | 5665篇 |
口腔科学 | 475篇 |
临床医学 | 4758篇 |
内科学 | 9144篇 |
皮肤病学 | 481篇 |
神经病学 | 4470篇 |
特种医学 | 1777篇 |
外科学 | 8727篇 |
综合类 | 350篇 |
现状与发展 | 1篇 |
一般理论 | 56篇 |
预防医学 | 3759篇 |
眼科学 | 805篇 |
药学 | 2845篇 |
中国医学 | 34篇 |
肿瘤学 | 3224篇 |
出版年
2024年 | 61篇 |
2023年 | 479篇 |
2022年 | 853篇 |
2021年 | 2060篇 |
2020年 | 1068篇 |
2019年 | 1711篇 |
2018年 | 2066篇 |
2017年 | 1448篇 |
2016年 | 1468篇 |
2015年 | 1620篇 |
2014年 | 2328篇 |
2013年 | 2752篇 |
2012年 | 4352篇 |
2011年 | 4243篇 |
2010年 | 2229篇 |
2009年 | 1880篇 |
2008年 | 2965篇 |
2007年 | 3070篇 |
2006年 | 2579篇 |
2005年 | 2300篇 |
2004年 | 2016篇 |
2003年 | 1691篇 |
2002年 | 1477篇 |
2001年 | 168篇 |
2000年 | 132篇 |
1999年 | 170篇 |
1998年 | 258篇 |
1997年 | 201篇 |
1996年 | 142篇 |
1995年 | 122篇 |
1994年 | 99篇 |
1993年 | 75篇 |
1992年 | 59篇 |
1991年 | 44篇 |
1990年 | 39篇 |
1989年 | 39篇 |
1988年 | 38篇 |
1987年 | 43篇 |
1986年 | 34篇 |
1985年 | 38篇 |
1984年 | 40篇 |
1983年 | 35篇 |
1982年 | 39篇 |
1981年 | 28篇 |
1980年 | 32篇 |
1979年 | 15篇 |
1978年 | 17篇 |
1974年 | 19篇 |
1973年 | 18篇 |
1972年 | 14篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Edward J Hepworth Matthew Bucknor Ankit Patel Winston C Vaughan 《Otolaryngology--head and neck surgery》2006,135(1):68-73
OBJECTIVE: To evaluate impressions and usage of sinus surgery image-guided surgical (IGS) systems by ENT surgeons in the United States. STUDY DESIGN AND SETTING: A survey was mailed to selected practicing ENT physicians, investigating regional information, practice type, IGS usage patterns, perceived benefits and limitations, and usage of the 61795 surgery code. RESULTS: Seventy-three percent of respondents use IGS. Nonusers respond that it provides no benefit or is too expensive. Eighty percent of respondents replied that IGS may allow for increased safety in certain procedures. Most users attempt reimbursement with the 61795 code. CONCLUSION: IGS usage is increasing but appears to be perceived as expensive and nonbeneficial in certain situations. Most respondents, however, felt that IGS may lead to safer surgery in certain situations, including revision and frontal procedures. Several factors appear to limit routine use including ease of use, technical setup, code reimbursement, and initial purchase costs. SIGNIFICANCE: IGS use appears to be increasing. The most frequent users appear to agree with the previously issued AAO-HNS guidelines regarding appropriate indications. Expanded use may depend on ease of use, reimbursement, and affordability. EBM rating: D-5. 相似文献
22.
Raymond Dalgleish Timothy Francis Matthew J Beckman 《Journal of orthopaedic research》2006,24(7):1571-2; author reply 1572-4
23.
Matthew Hoare Tracy Woodall Graeme J M Alexander 《Journal of interferon & cytokine research》2005,25(3):174-176
First-line therapy for hepatitis C virus (HCV) infection comprises interferon-alpha (IFN-alpha) and ribavirin for 6 or 12 months. Mild complications of therapy are common, but more serious complications are rare. Three patients with chronic HCV infection, acquired through injecting drug use, developed idiopathic facial paralysis (Bell's palsy) during therapy, with spontaneous resolution after withdrawal of treatment. Large-scale cohort studies reveal that IFNs are associated rarely with neurologic complications, and only one previous report has linked IFN-alpha therapy and Bell's palsy. We postulate that IFN-alpha therapy led to a breakdown of peripheral tolerance to myelin sheath antigens, leading to neuropathy, just as IFN-alpha therapy can cause autoimmune thyroiditis through breakdown of tolerance to native thyroid antigens. 相似文献
24.
Yair Lotan Matthew T Gettman Claus G Roehrborn Margaret S Pearle Jeffrey A Cadeddu 《JSLS, Journal of the Society of Laparoendoscopic Surgeons》2003,7(2):111-115
BACKGROUND AND OBJECTIVES: To evaluate the experience with laparoscopic nephrectomy in a large county hospital and perform a cost comparison between uncomplicated open and laparoscopic nephrectomy. METHODS: Eleven consecutive patients who underwent an uncomplicated laparoscopic nephrectomy in a large county hospital were compared with 8 patients who underwent uncomplicated open nephrectomy during the same period. Patient charts and corresponding billing records were reviewed to determine overall hospitalization cost and individual cost components. RESULTS: No perioperative complications occurred in either the laparoscopic or open group, and no statistically significant differences existed between groups with regard to patient demographics or operative parameters. The overall operating room costs favored the open nephrectomy group by dollars 1070 (P=0.003). However, the overall cost of hospitalization, surgeon professional fees, duration of hospitalization, room and board costs, laboratory, and radiology costs, pharmacy costs, intravenous solution and infusion pump costs all significantly favored the laparoscopic patient group. The mean difference in overall hospital cost between laparoscopic and open nephrectomy was dollars 1211 in favor of laparoscopy (P=0.037). CONCLUSIONS: Our experience with laparoscopic nephrectomy in a large county hospital demonstrates a clear economic advantage in favor of the laparoscopic approach. Given limited funding for public hospitals and a clear patient benefit, laparoscopic nephrectomy should constitute first-line therapy when nephrectomy is indicated. 相似文献
25.
Radionuclide targeting and dosimetry at the microscopic level: the role of microautoradiography 总被引:1,自引:0,他引:1
Matthew R. B. Puncher Philip J. Blower 《European journal of nuclear medicine and molecular imaging》1994,21(12):1347-1365
The understanding of localisation mechanisms and microdosimetry of diagnostic and therapeutic radiopharmaceuticals depends
on knowledge of their biodistribution at the microscopic level (cellular and subcellular) in the target tissues. Various methods
have been advanced for obtaining information about this microdistribution: subcellular fractionation, secondary ion mass spectrometry
imaging, microprobe elemental analysis in the electron microscope, and microautoradiography. This review compares these approaches,
and discusses in detail the methodology of microautoradiography (the most generally useful approach) with imaging and therapy
radionuclides. Literature examples of applications of microautoradiography in nuclear medicine are reviewed, and the future
potential contribution of the techniques is assessed. 相似文献
26.
27.
28.
29.
Background
Resident-led morning report is an integral part of most residency programs and is ranked among the most valuable of educational experiences. The objectives of this study were to evaluate the effect of a resident-as-teacher educational intervention on the educational and teaching experience of morning report. 相似文献30.