全文获取类型
收费全文 | 183154篇 |
免费 | 1342篇 |
国内免费 | 48篇 |
专业分类
耳鼻咽喉 | 1164篇 |
儿科学 | 6841篇 |
妇产科学 | 3070篇 |
基础医学 | 17806篇 |
口腔科学 | 1870篇 |
临床医学 | 13037篇 |
内科学 | 32092篇 |
皮肤病学 | 763篇 |
神经病学 | 17110篇 |
特种医学 | 9654篇 |
外科学 | 29839篇 |
综合类 | 2335篇 |
一般理论 | 1篇 |
预防医学 | 18414篇 |
眼科学 | 2788篇 |
药学 | 10108篇 |
中国医学 | 646篇 |
肿瘤学 | 17006篇 |
出版年
2022年 | 45篇 |
2021年 | 80篇 |
2020年 | 60篇 |
2019年 | 122篇 |
2018年 | 22030篇 |
2017年 | 17441篇 |
2016年 | 19618篇 |
2015年 | 1071篇 |
2014年 | 1021篇 |
2013年 | 1108篇 |
2012年 | 7412篇 |
2011年 | 21478篇 |
2010年 | 19074篇 |
2009年 | 11803篇 |
2008年 | 19875篇 |
2007年 | 22150篇 |
2006年 | 1018篇 |
2005年 | 2651篇 |
2004年 | 3834篇 |
2003年 | 4800篇 |
2002年 | 3012篇 |
2001年 | 394篇 |
2000年 | 499篇 |
1999年 | 302篇 |
1998年 | 332篇 |
1997年 | 339篇 |
1996年 | 206篇 |
1995年 | 190篇 |
1994年 | 184篇 |
1993年 | 143篇 |
1992年 | 97篇 |
1991年 | 148篇 |
1990年 | 183篇 |
1989年 | 127篇 |
1988年 | 99篇 |
1987年 | 80篇 |
1986年 | 73篇 |
1985年 | 91篇 |
1984年 | 77篇 |
1983年 | 68篇 |
1982年 | 76篇 |
1981年 | 58篇 |
1980年 | 88篇 |
1978年 | 47篇 |
1976年 | 43篇 |
1975年 | 43篇 |
1974年 | 47篇 |
1938年 | 64篇 |
1932年 | 57篇 |
1930年 | 47篇 |
排序方式: 共有10000条查询结果,搜索用时 687 毫秒
31.
杨娅 Thomas Bartel Loredana Latina Guido Caspari 王新房 Raimund Erbel 《华中科技大学学报(医学英德文版)》2002,22(2):158-163
Coronary flow reserve (CFR) has been used toassess coronary microcirculation and epicardial coro-nary stenoses[1— 3 ] . CFR is defined as the ratio ofcoronary flow under maximal coronary vasodilatationto coronary flow under resting conditions[4 ] .Whenthe cross- sectional area of epicardial coronary arteriesis constant,coronary flow velocity (CFV) ratios areequal to volume flow ratios.The most common method used clinically formeasuring CFVR is intracoronary Doppler flow(ICD) analysis re… 相似文献
32.
Olle Zetterström Christer Andersson Leif Eriksson ers Fredriksson Johan Friskopp Gunnar Heden Bernt Jansson Tord Lundgren Rolf Nilveus ers Olsson Stefan Renvert Lars Salonen Lars Sjöström ers Winell ers Östgren Stina Gestrelius 《Journal of clinical periodontology》1997,24(9):697-704
Abstract The aim of the present clinical trial was to test tolerability during 2 treatments with EMDOGAIN® in a large number of patients. An open, controlled study design in 10 Swedish specialist clinics was chosen, with a test group of 107 patients treated with EMDOGAIN® in connection with periodontal surgery at 2 surgical test sites per patient. The procedures were performed 2 to 6 weeks apart on one-rooted teeth with at least 4 mm deep intraosseous lesions. A control group of 33 patients underwent flap surgery without EMDOGAIN® at I comparable site. In total 214 test and 33 control surgeries were performed. Serum samples were obtained from test patients for analysis of total and specific antibody levels. 10 of the patients had samples taken before and after the first surgery. 56 other samples were taken after one treatment with EMDOGAIN®, and 63 after 2 treatments. None of the samples, not even from allergy-prone patients after 2 treatments, indicated deviations from established baseline ranges. This indicates that the immunogenic potential of EMDOGAIN® is extremely low when applied in conjunction with periodontal surgery. Comparison between the test and control groups demonstrated the same type and frequency of post-surgical experiences, i.e., reactions caused by the surgical procedure itself. Clinical probing and radiographic evaluation was performed at baseline and 8 months postsurgery. About half of the patients (44 test and 21 control) were also evaluated after 3 years. There was a significant difference between the test and control results at 8 months post surgery. and this difference had increased further at the 3 year follow-up. The 2.5–3 mm increase in attachment and bone level after treatment with EMDOGAIN® was of the same magnitude as seen in the studies with split-mouth design aiming for lest of effectiveness of EMDOGAIN®. 相似文献
33.
34.
35.
Irwin L. Flink 《Brain structure & function》2002,205(3):235-244
36.
37.
38.
Hinrich Böhner Detlef Kindgen-Milles Andreas Grust Rolf Buhl Wolf-Christian Lillotte Barbara T. Müller Eckhard Müller Günter Fürst Wilhelm Sandmann 《Langenbeck's archives of surgery / Deutsche Gesellschaft fur Chirurgie》2002,387(1):21-26
BACKGROUND: The efficacy of nasal continuous positive airway pressure (nCPAP) as a prophylactic method for preventing cardiopulmonary complications after major vascular surgery has not been investigated. PATIENTS/METHODS: In a prospective randomized trial, 204 patients undergoing elective midline laparotomy for vascular surgery were randomized to receive standard therapy ( n=105) or additional prophylactic nCPAP ( n=99) for the first postoperative night. Postoperative oxygenation, incidence of severe cardiac, and pulmonary complications, length of intensive care surveillance and length of total postoperative hospital stay (LOS) were compared. RESULTS: Prophylactic nCPAP significantly reduced the number of patients with severe oxygenation disturbances defined as paO(2) < 70 mmHg with FiO(2) > or = 0.7 (5 versus 17, P=.01). There were no differences with respect to death, cardiac and pulmonary complications, length of intensive care surveillance or LOS. CONCLUSION: Prophylactic 12 h nCPAP significantly reduces the occurrence of postoperative oxygenation disturbances but has no effect on cardiac or pulmonary complications, need for intensive care, LOS or mortality after major vascular surgery. 相似文献
39.
40.
Paul Hochstein Ulrich Glatzel Thomas Schmickal Andreas Wentzensen 《Trauma und Berufskrankheit》2002,4(2):s110-s114
The treatment of deep cartilage defects in load-bearing joints is a problem that still has no satisfactory solution. Full-thickness defects of the articular cartilage rarely heal spontaneously, usually leaving damage that can lead to early arthrosis. Techniques currently available for the treatment of chondral defects include abrasion, drilling, micro-fracturing, transplantation of tissue autografts and allografts, and cell transplantation. Osteochondral autograft transplantation is currently the only surgical cartilage repair technique known to lead to the formation of genuine hyaline articular cartilage and its retention at least in the medium term. The Draenert method, in which a water-cooled diamond bone-cutting system is used, is an effective procedure for resurfacing the joints affected by localised cartilaginous defects, even when there is also severe bone loss. Donor-side morbidity can be kept to a minimum by filling the defect caused by harvesting with a press-fit cylinder of cancellous bone covered with periosteum for protection. 相似文献