全文获取类型
收费全文 | 14972篇 |
免费 | 1020篇 |
国内免费 | 262篇 |
专业分类
耳鼻咽喉 | 175篇 |
儿科学 | 302篇 |
妇产科学 | 499篇 |
基础医学 | 1788篇 |
口腔科学 | 745篇 |
临床医学 | 1421篇 |
内科学 | 2883篇 |
皮肤病学 | 157篇 |
神经病学 | 1505篇 |
特种医学 | 521篇 |
外科学 | 1972篇 |
综合类 | 903篇 |
一般理论 | 1篇 |
预防医学 | 982篇 |
眼科学 | 425篇 |
药学 | 1008篇 |
4篇 | |
中国医学 | 179篇 |
肿瘤学 | 784篇 |
出版年
2023年 | 114篇 |
2022年 | 204篇 |
2021年 | 328篇 |
2020年 | 230篇 |
2019年 | 255篇 |
2018年 | 300篇 |
2017年 | 296篇 |
2016年 | 292篇 |
2015年 | 407篇 |
2014年 | 414篇 |
2013年 | 580篇 |
2012年 | 693篇 |
2011年 | 847篇 |
2010年 | 623篇 |
2009年 | 561篇 |
2008年 | 713篇 |
2007年 | 782篇 |
2006年 | 713篇 |
2005年 | 636篇 |
2004年 | 615篇 |
2003年 | 600篇 |
2002年 | 576篇 |
2001年 | 480篇 |
2000年 | 447篇 |
1999年 | 396篇 |
1998年 | 207篇 |
1997年 | 173篇 |
1996年 | 140篇 |
1995年 | 121篇 |
1994年 | 144篇 |
1993年 | 118篇 |
1992年 | 239篇 |
1991年 | 235篇 |
1990年 | 203篇 |
1989年 | 198篇 |
1988年 | 198篇 |
1987年 | 161篇 |
1986年 | 163篇 |
1985年 | 160篇 |
1984年 | 110篇 |
1983年 | 114篇 |
1982年 | 71篇 |
1980年 | 62篇 |
1979年 | 87篇 |
1978年 | 78篇 |
1977年 | 70篇 |
1975年 | 96篇 |
1974年 | 71篇 |
1973年 | 64篇 |
1972年 | 69篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
K. Dahan V. Audard F. Roudot-Thoraval D. Desvaux M. Abtahi H. Mansour M. Kumal P. Lang P. Grimbert 《American journal of transplantation》2006,6(7):1725-1730
The clinical outcome and appropriate management for patients showing 'borderline changes' on allograft biopsy after renal transplantation is still controversial. In an attempt to identify predictive factors of clinical outcome of patients with such lesions, we reviewed the clinical course of 91 patients with borderline changes. Multivariate analysis revealed significant and independent effects of histological stage (i + t < or = or > 2) and time to borderline changes (< or = or > 3 months after transplant) on serum creatinine levels at 1 year from borderline changes episodes (respectively, p = 0.04 and p = 0.02) and only a significant effect of time to borderline changes on serum creatinine levels at 2 years (p = 0.005). Renal function at 1 year and 2 years as 5- and 8-year graft survival were not significantly different in the group of patients treated with antirejection therapy (T group, n = 49) compared with the untreated group (UT group, n = 42). This study strongly suggests that borderline changes with histological score (i + t) > 2 and late episodes of borderline changes should be considered to be of poor prognosis. 相似文献
2.
Lisa A. Lang DDS MS David C. Holmes DDS MS Craig Passon DDS MS Robert M. Trombly DDS JD Jeffrey D. Astroth DDS MSPH Arnold F. Tavel DMD 《Journal of prosthodontics》2003,12(3):206-210
Using complete denture treatment as an introduction to clinical patient care for dental students, the purposes of the Complete Denture Prosthodontics Transition Clinic at the University of Colorado School of Dentistry are to reduce the time lapse between the preclinical complete denture prosthodontics course and the first denture patient experience, and to encourage development of student self-confidence and skills. In the 2002 spring semester, faculty at the University of Colorado School of Dentistry initiated the Complete Denture Prosthodontics Transition Clinic for DS-II (second-year) dental students, as an introduction to clinical patient care. Each patient was assigned to a team of two dental students. Three Division of Prosthodontics faculty members staffed each clinic session, providing a student-to-faculty ratio of approximately 6.6:1 and a patient-to-faculty ratio of approximately 3.3:1. All DS-II students in the Class of 2004 delivered their first complete dentures no later than 8 months (average, 184 days) after the last day of the preclinical complete denture prosthodontics course. The time from the diagnostic appointment through the denture placement appointment averaged 39 days for patients treated in this program, compared with an average of 98 days or more for previous classes. The program was successful in achieving the goal of reducing the time lapse between the preclinical complete denture prosthodontics course and the first denture patient experience. 相似文献
3.
The possible reversal by calcium of the inhibitory action of verapamil on the atrioventricular (AV) node was investigated in anesthetized, atropinized dogs, with cardiac pacing. The His bundle potentials were recorded by endocavitory electrode and the AV node effective refractory period measured by the extrastimulus method. Calcium infusion was effective against the impairment of AV nodal conduction induced by verapamil, provided it remained moderate: the gradual rise in the plasma calcium concentration counteracted the effects of an infusion of verapamil on conduction time and effective refractory period in the AV node, as long as it did not exceed 5 mmol/L. However, beyond this level, calcium appeared less and less capable of reversing the effects of verapamil. Thus, the protective action of calcium had a bell-shaped dose-response curve, with the optimum at 5 mmol/L. This biphasic influence is consistent with the opposite opinions previously given concerning the antagonism between calcium and calcium blockers, depending on whether hypercalcemia brought into play was mild or major. In any case, the prominent role played by calcium in the slow inward current in the AV node accounts for the antagonism, observed in vivo, between calcium and verapamil. The pacemaker activity of the sinoatrial (SA) node was less influenced by both calcium blocker and calcium. 相似文献
4.
Frank Lindseth Thomas Lang? Jon Bang Toril A Nagelhus Hernes 《Computer aided surgery》2002,7(4):197-222
5.
6.
7.
8.
9.
K H Orend N Zarbis H Schelzig G Halter G Lang L Sunder-Plassmann 《European journal of vascular and endovascular surgery》2007,34(6):666-672
OBJECTIVES: To present a single centers' 7-year experience in the endovascular treatment of acute traumatic lesions of the descending thoracic aorta (ATL of the DTA). MATERIALS & METHODS: Between March 1999 and December 2006, 34 consecutive acute traumatic lesions of the descending aorta (23 men, mean age 44 years) were treated endovascularly. Stentgrafts used were TAG Excluder, Zenith TX2 and Talent. In 23 patients the Left Subclavian Artery (LSA) was covered. Mean procedural duration was 20 to 75 minutes. RESULTS: Exclusion of the rupture site was achieved in all cases with no conversion to open surgery. Overall 30-day mortality was 8.8%. Two patients died on post operative day (pod) 1 and one on pod 22 from cranial injuries. No death or neurological deficit related to the endovascular treatment was reported. Four type I endoleaks required treatment either by balloon reexpansion (n=2) or by additional stentgraft implantation (n=2). In two patients the stentgraft collapsed totally several days postoperatively. Two patients required secondary surgical procedures (iliac access complication and revascularisation of the left subclavian artery n=1). The average follow-up was 43.8 months (1-93 months). No stentgraft related abnormality has been subsequently documented. CONCLUSIONS: The endovascular treatment of ATL of the DTA may offer the best means of therapy in a polytrauma patient. 相似文献
10.