全文获取类型
收费全文 | 8137篇 |
免费 | 296篇 |
国内免费 | 233篇 |
专业分类
耳鼻咽喉 | 209篇 |
儿科学 | 53篇 |
妇产科学 | 13篇 |
基础医学 | 268篇 |
口腔科学 | 101篇 |
临床医学 | 860篇 |
内科学 | 578篇 |
皮肤病学 | 143篇 |
神经病学 | 316篇 |
特种医学 | 356篇 |
外国民族医学 | 8篇 |
外科学 | 639篇 |
综合类 | 2084篇 |
预防医学 | 893篇 |
眼科学 | 134篇 |
药学 | 830篇 |
5篇 | |
中国医学 | 904篇 |
肿瘤学 | 272篇 |
出版年
2024年 | 19篇 |
2023年 | 83篇 |
2022年 | 96篇 |
2021年 | 86篇 |
2020年 | 78篇 |
2019年 | 108篇 |
2018年 | 126篇 |
2017年 | 70篇 |
2016年 | 110篇 |
2015年 | 99篇 |
2014年 | 261篇 |
2013年 | 257篇 |
2012年 | 279篇 |
2011年 | 348篇 |
2010年 | 273篇 |
2009年 | 337篇 |
2008年 | 332篇 |
2007年 | 330篇 |
2006年 | 340篇 |
2005年 | 367篇 |
2004年 | 375篇 |
2003年 | 323篇 |
2002年 | 291篇 |
2001年 | 332篇 |
2000年 | 320篇 |
1999年 | 273篇 |
1998年 | 245篇 |
1997年 | 262篇 |
1996年 | 262篇 |
1995年 | 245篇 |
1994年 | 187篇 |
1993年 | 151篇 |
1992年 | 134篇 |
1991年 | 163篇 |
1990年 | 155篇 |
1989年 | 161篇 |
1988年 | 137篇 |
1987年 | 97篇 |
1986年 | 82篇 |
1985年 | 80篇 |
1984年 | 65篇 |
1983年 | 83篇 |
1982年 | 68篇 |
1981年 | 50篇 |
1980年 | 44篇 |
1979年 | 13篇 |
1978年 | 8篇 |
1977年 | 7篇 |
1976年 | 8篇 |
1958年 | 10篇 |
排序方式: 共有8666条查询结果,搜索用时 15 毫秒
51.
Effect of autocontrol micromotion intramedullary interlocking nail on fracture healing: an experimental study 总被引:1,自引:0,他引:1
Objective: To investigate the effect of autocontrol micromotion locking nail ( AMLN ) on experimental fracture healing and its mechanism. Methods: 16 goats undergoing both sides of transverse osteotomy of the femoral shafts were fixed intramedullary with AMLN and Gross-Kempf (GK) nail, respectively. The follow-up time was 7, 14, 28 and 56 days. Roentgenographic, biomechanical, histological, scanning electromicroscopic and biochemical analyses were done. Results: (1) The strength of anticompression, antiflexion and antitorsion in the fractural end in the AMLN-fixed group was higher than that of GK nail-fixed group; whereas, the rate of stress shelter in the fractured end decreased significantly (P<0.01). (2) The content of the total collagen, insoluble collagen, calcium and phosphate in the AMLN-fixed group was higher than that in the GK nail-fixed group (P<0.05). (3) Histological observation and quantitative analysis of calluses revealed that AMLN could promote the growth of bridge calluses and periosteum calluses. Hence the facture healing and remolding process achieved early, which was much better than traditional GK nail fixation. (P<0.05). (4) 7-14 days postoperation, the calluses of AMLN-fixed group was flourish and camellarly arranged and the collagen fibril formed constantly in the absorption lacuna of bone trabecula. 28-56 days postoperation, the collagen fibril was flourish around the absorption lacuna and was parallel to the bone's longitudinal axis. Active bony absorption and formation were seen, so was remolding and rebuilding. Haversian system was intact and the bony structural net was very tenacious because of the deposition of calcium salt. None of the above findings was observed in the GK nailfixed group. Conclusions: The design of AMLN accords well with the plastic fixation theory. As the geometry ametabolic system constituted by the intramedullary fixation instruments and the proximal and distal end of the fracture is very firm and stable, the disturbance to the physical stress distributed in the fractural end is light. The generation and conduct of the intermittent physical stress between the fractural parts could reach the balance between stress conduct and stress protection. The feature that the healing and remolding take place at the same time speeds up the fractural healing process. 相似文献
52.
53.
抗人生长激素免疫血清的制备和鉴定 总被引:1,自引:1,他引:0
Using small dosage of human growth hormone to immunize rabbit or guinea pig, it is able to induce anti-hGH antibody formation with high titre and high affinity that could be applied to hGH RIA. In the present study five rabbits and three guinea pigs were immunized with 125-200 micrograms and 250-285 micrograms per animal of hGH respectively, followed by boosters of 10-20 or 160-250 micrograms of hGH at 2-4 week intervals for 6 or 3 months. Blood was drown 1-2 weeks before each booster for determination of antibody formation. Antibody titre and affinity were successively observed and specificity of antibody was determined for the final bleeding. It was shown that titres of immune sera from guinea pigs were much higher than those of rabbit immune sera, but vice versa for antibody affinity. This might be due to larger immunogen dose used for guinea pigs than for rabbits. Fourteen different peptide hormones were tested in reference to cross-immunoreactivity to anti-hGH antibody. It could be demonstrated that the major cross-reactive hormones are hFSH and hLH, and hTSH also reacts to rabbit anti-hGH immune sera at a lesser degree. These cross reactivities are obviously owing to the molecular homogeneities between hGH and these hormones especially of their alpha-subunits. 相似文献
54.
<正> 肱骨外科颈骨折并肩关节脱位,是一种复杂而严重的创伤,临床上并不多见。其手法整复难度大,目前大多数人主张手术治疗,但术后易并发肩关节功能障碍,如处理不当,可造成严重致残。我科自1985~1990年共收治该病10例,均经闭合手法整复,小夹板外固定治疗,疗效满意。1 一般资料本组共10例,男3例,女7例。年龄最小7岁,最大70岁,平均51岁。病史最短3小时,最长15天,平均6.5天。左侧7例,右侧3例。 相似文献
55.
慢性胃炎、十二指肠球部溃疡等疾病与幽门螺杆菌(HP)的感染密切相关。国内外的学者们均在致力于寻求有效的清除、根治HP的治疗方法。近年来我们用中药治疗胃内HP感染,并与丽珠得乐做了对照,疗效较满意,小结如下: 一般资料:治疗组23例,全部为住院病人,男18例、女5例,年龄最小为16岁,最大70岁,平均38.7岁。45岁以下为15例,46~60岁6例,61岁以上2例。病程1~10年不等,平均2.6年,对照组17例,一般资料与对照组基本相似,具有可比性。 相似文献
56.
57.
带血管蒂岛状筋膜瓣移植治疗晚期类风湿性髋关节炎 总被引:1,自引:0,他引:1
目的:阐明带血管蒂岛状筋膜瓣移植治疗晚期类风湿性髋关节炎的疗效。材料和方法:对42例48髋晚期类风湿性髋关节炎病人采用以旋股外侧血管降支为蒂的股前外侧筋膜瓣移植行患髋成形术。结果:术后随访4~10.5年,平均4.5年,髋关节活动范围术前平均16.5°,术后228.6°,按照Charnley和吴之康人工髋关节置换术后的疗效评定标准,优良29髋、很好13髋、好6髋,尚可、差、很差无。结论:患者年龄在15~40岁之间为合适的治疗年龄。与人工髋关节置换术相比,本方法对髋关节正常结构破坏小;一旦手术失败仍可选用其它治疗方法弥补;且并发症少、费用低、远期效果好。 相似文献
58.
59.
60.