全文获取类型
收费全文 | 2547511篇 |
免费 | 201066篇 |
国内免费 | 3862篇 |
专业分类
耳鼻咽喉 | 34595篇 |
儿科学 | 84245篇 |
妇产科学 | 72237篇 |
基础医学 | 370198篇 |
口腔科学 | 74546篇 |
临床医学 | 232382篇 |
内科学 | 492881篇 |
皮肤病学 | 55186篇 |
神经病学 | 206227篇 |
特种医学 | 98663篇 |
外国民族医学 | 713篇 |
外科学 | 374902篇 |
综合类 | 59495篇 |
现状与发展 | 5篇 |
一般理论 | 1060篇 |
预防医学 | 205454篇 |
眼科学 | 58361篇 |
药学 | 190811篇 |
9篇 | |
中国医学 | 4483篇 |
肿瘤学 | 135986篇 |
出版年
2018年 | 25234篇 |
2016年 | 21638篇 |
2015年 | 25071篇 |
2014年 | 34574篇 |
2013年 | 53092篇 |
2012年 | 71781篇 |
2011年 | 76272篇 |
2010年 | 44705篇 |
2009年 | 42904篇 |
2008年 | 72437篇 |
2007年 | 76966篇 |
2006年 | 77290篇 |
2005年 | 75350篇 |
2004年 | 73526篇 |
2003年 | 70470篇 |
2002年 | 68627篇 |
2001年 | 113913篇 |
2000年 | 117252篇 |
1999年 | 99589篇 |
1998年 | 27916篇 |
1997年 | 25393篇 |
1996年 | 25674篇 |
1995年 | 24730篇 |
1994年 | 23123篇 |
1993年 | 21786篇 |
1992年 | 81550篇 |
1991年 | 79657篇 |
1990年 | 77699篇 |
1989年 | 75255篇 |
1988年 | 69840篇 |
1987年 | 68732篇 |
1986年 | 65608篇 |
1985年 | 62992篇 |
1984年 | 47515篇 |
1983年 | 41405篇 |
1982年 | 24477篇 |
1981年 | 22065篇 |
1980年 | 20786篇 |
1979年 | 45472篇 |
1978年 | 32309篇 |
1977年 | 27223篇 |
1976年 | 25557篇 |
1975年 | 27181篇 |
1974年 | 33143篇 |
1973年 | 32207篇 |
1972年 | 29952篇 |
1971年 | 28105篇 |
1970年 | 26126篇 |
1969年 | 24745篇 |
1968年 | 22726篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
T. M. Skerry M.D. M.R.C.V.S. R. Suswillo A. J. El Haj N. N. Ali R. A. Dodds L. E. Lanyon 《Calcified tissue international》1990,46(5):318-326
Summary Previous studies of Alcian blue-induced birefringence in adult avian cortical bone showed that a short period of intermittent
loading rapidly produces an increased level of orientation of proteoglycans within the bone tissue. In the absence of further
loading, this persists for over 24 hours. We have proposed that this phenomenon could provide a means for “capturing” the
effects of transient strains, and so provide a persistent, constantly updated strain-related influence on osteocyte populations
related to the bones' averaged recent strain history, in effect, a “strain memory” in bone tissue. In our present study, we
use the Alcian blue-induced birefringence technique to demonstrate that proteoglycan orientation also occurs after intermittent
loading of both cortical and cancellous mammalian bonein vivo andin vitro. We also show that the change in birefringence is proportional to the magnitude of the applied strain, and that the reorientation
occurs rapidly, reaching a maximal value after only 50 loading cycles. Examination of electron micrographs of bone tissue
after staining with cupromeronic blue allows direct visualization and quantification of the change in proteoglycan orientation
produced by loading. This shows that intermittent loading is associated with a realignment of the proteoglycan protein cores,
bringing them some 5 degrees closer to the direction of collagen fibrils in the bone matrix. 相似文献
992.
John R. Jarrett M.D. 《Aesthetic plastic surgery》1990,14(1):87-92
Immediate reconstruction of more than 1000 breasts was performed on high-risk patients on whom a prophylactic mastectomy was done. The mastectomy removes as much breast tissue as possible while leaving sufficient skin, and possibly the nipple-areola complex, to enable immediate reconstruction. The creation of symmetrical, well-balanced muscle pockets for the implant is the most important factor in producing satisfactory results in these cases. 相似文献
993.
Analysis and management of chronic testicular pain 总被引:3,自引:0,他引:3
A total of 45 patients was seen in consultation between May 1980 and April 1989 for chronic unilateral or bilateral orchialgia, defined as intermittent or constant testicular pain 3 months or longer in duration that significantly interferes with the daily activities of the patient so as to prompt him to seek medical attention. We analyzed 34 patients available for followup in terms of socioeconomic parameters, etiology and duration of pain, associated urological symptomatology, specific treatment and results of therapy. Of the patients 31 underwent surgical treatment after failing medical management (24 orchiectomies, 10 epididymectomies, 5 orchiopexies and 1 hydrocelectomy). Of 10 patients who underwent epididymectomy 9 underwent subsequent orchiectomy as definitive treatment. Of 15 patients who underwent inguinal orchiectomy 11 (73%) reported complete relief of pain, while 4 had partial relief. Of the 9 patients who underwent scrotal orchiectomy 5 (55%) reported complete relief of pain, 3 had partial relief and 1 denied improvement. On the basis of these results we recommend inguinal orchiectomy as the procedure of choice for the management of chronic testicular pain when conservative measures are unsuccessful. 相似文献
994.
995.
The treatment options of patients with urge incontinence are behavioral therapy, drug therapy and surgery. The evaluation and reported efficacy of these treatments, with particular reference to the potential placebo response in treatment is discussed. 相似文献
996.
997.
998.
Extravesical versus Leadbetter-Politano ureteroneocystostomy: a comparison of urological complications in 320 renal transplants 总被引:3,自引:0,他引:3
The urological complications of 320 consecutive renal transplants performed at our institution between October 17, 1985 and November 10, 1989 are reviewed. The Leadbetter-Politano technique of ureteroneocystostomy was used in the first 160 patients (group 1) and an anterior extravesical technique modified from the methods of Witzel, Sampson and Lich was performed in the second 160 patients (group 2). Urological complications occurred in 15 patients (9.4%) in group 1 and 6 (3.7%) in group 2 (p = 0.04). Ureterovesical junction obstruction occurred in 6 patients (3.7%) in group 1 and 1 (0.6%) in group 2 (p = 0.05). Complications of leakage, ureteral necrosis and ureteral stricture were comparable in the 2 groups. Therefore, we advocate the use of the anterior extravesical technique over Leadbetter-Politano ureteral reimplantation based on the lower incidence of urological complications and various technical advantages, including less operative time, avoidance of a separate cystotomy, less hematuria and ability to use short donor ureters. 相似文献
999.
1000.
Improved graft survival for flow cytometry and antihuman globulin crossmatch-negative retransplant recipients 总被引:1,自引:0,他引:1
R H Kerman C T Van Buren R M Lewis V DeVera V Baghdahsarian K Gerolami B D Kahan 《Transplantation》1990,49(1):52-56
We compared our standard NIH (extended incubation) crossmatch (XM) with antihuman globulin (AHG) and flow cytometry XMs and correlated the results with rejection episodes and graft survivals. For 89 CsA-Pred, primary renal allograft recipients, AHG and/or FCXM results did not improve on the NIH-XM-negative (NEG) graft survival results, whether testing pretransplant or historical (Hx) sera. Similarly, there was no association of a positive (POS) AHG or FCXM with increased rejection episodes in these primary recipients. However, for retransplant (Re-Tx) recipients a neg AHG or FCXM did discriminate fewer rejections and an improved graft survival compared with the NIH-XM-neg. results. The overall one-year graft survival for the 47 Re-Tx recipients studied herein was 66% (based on a neg pre-Tx NIH-XM). Pre-Tx AHG-NEG, Re-Tx recipients displayed an improved graft survival compared with NIH-XM NEG recipients (77% vs. 66%, P less than 0.05) and with AHG-POS recipients (77% vs. 47%, P less than 0.05). Similarly, pre-Tx, FCXM-NEG, Re-Tx recipients displayed improved graft survivals compared with NIH-XM-NEG recipients (83% vs. 66%, P less than 0.05) and FCXM-POS recipients (83% vs. 48%, P less than 0.05). Re-Tx recipients displaying a POS AHG and/or FCXM experienced a significantly greater number of rejections than NEG-XM recipients (P less than 0.05, respectively). The AHG and FCXM results correlated with rejections and graft survivals whether testing pre-Tx or Hx high-PRA sera. Re-Tx recipients who were AHG-XM-NEG but FCXM-POS, experienced more rejection episodes than recipients who displayed a negative XM reactivity for both AHG and FCXM (P less than 0.02), but with no resulting differences in graft survival. HLA matching, pre-Tx blood transfusions and PRA did not impact on these crossmatch and graft survival results. Use of AHG and/or FCXMs for Re-Tx, but not primary, recipients should help to improve graft survival for these high-risk recipients. 相似文献