全文获取类型
收费全文 | 2002篇 |
免费 | 145篇 |
国内免费 | 2篇 |
专业分类
耳鼻咽喉 | 15篇 |
儿科学 | 104篇 |
妇产科学 | 38篇 |
基础医学 | 260篇 |
口腔科学 | 74篇 |
临床医学 | 166篇 |
内科学 | 370篇 |
皮肤病学 | 40篇 |
神经病学 | 175篇 |
特种医学 | 114篇 |
外科学 | 282篇 |
综合类 | 42篇 |
预防医学 | 163篇 |
眼科学 | 62篇 |
药学 | 110篇 |
中国医学 | 1篇 |
肿瘤学 | 133篇 |
出版年
2021年 | 17篇 |
2019年 | 35篇 |
2018年 | 27篇 |
2017年 | 16篇 |
2016年 | 23篇 |
2015年 | 23篇 |
2014年 | 44篇 |
2013年 | 81篇 |
2012年 | 87篇 |
2011年 | 56篇 |
2010年 | 58篇 |
2009年 | 43篇 |
2008年 | 68篇 |
2007年 | 69篇 |
2006年 | 71篇 |
2005年 | 76篇 |
2004年 | 62篇 |
2003年 | 66篇 |
2002年 | 58篇 |
2001年 | 38篇 |
2000年 | 51篇 |
1999年 | 41篇 |
1998年 | 34篇 |
1997年 | 53篇 |
1996年 | 47篇 |
1995年 | 31篇 |
1994年 | 38篇 |
1993年 | 27篇 |
1992年 | 46篇 |
1991年 | 47篇 |
1990年 | 44篇 |
1989年 | 52篇 |
1988年 | 39篇 |
1987年 | 47篇 |
1986年 | 42篇 |
1985年 | 54篇 |
1984年 | 29篇 |
1982年 | 24篇 |
1981年 | 17篇 |
1980年 | 21篇 |
1979年 | 40篇 |
1978年 | 27篇 |
1977年 | 21篇 |
1976年 | 22篇 |
1975年 | 18篇 |
1974年 | 20篇 |
1973年 | 21篇 |
1972年 | 28篇 |
1971年 | 25篇 |
1970年 | 17篇 |
排序方式: 共有2149条查询结果,搜索用时 390 毫秒
1.
V Aerra M Kuduvalli AN Moloto AK Srinivasan AD Grayson BM Fabri AY Oo 《Journal of cardiothoracic surgery》2006,1(1):6-5
Background
Atrial fibrillation can occur in up to 40% of patients undergoing coronary surgery. 相似文献2.
Paul M. Brunet Jennifer J. Heisz Catherine J. Mondloch David I. Shore Louis A. Schmidt 《Journal of anxiety disorders》2009,23(7):909-914
Contrary to popular beliefs, a recent empirical study using eye tracking has shown that a non-clinical sample of socially anxious adults did not avoid the eyes during face scanning. Using eye-tracking measures, we sought to extend these findings by examining the relation between stable shyness and face scanning patterns in a non-clinical sample of 11-year-old children. We found that shyness was associated with longer dwell time to the eye region than the mouth, suggesting that some shy children were not avoiding the eyes. Shyness was also correlated with fewer first fixations to the nose, which is thought to reflect the typical global strategy of face processing. Present results replicate and extend recent work on social anxiety and face scanning in adults to shyness in children. These preliminary findings also provide support for the notion that some shy children may be hypersensitive to detecting social cues and intentions in others conveyed by the eyes. Theoretical and practical implications for understanding the social cognitive correlates and treatment of shyness are discussed. 相似文献
3.
C E Paniak D L Shore B P Rourke 《Journal of clinical and experimental neuropsychology》1989,11(5):631-644
This study examined selective reminding and recognition memory performance of 21 severe closed-head injured patients tested within 6 months of regaining consciousness and then again after at least 1 year. Performances on selective reminding parameters were highly correlated and patients performed significantly worse at both testings than did hospitalized controls matched for age, education, and sex. Patients improved from testing 1 to testing 2 on only four of six memory variables. Average Impairment Rating at testing 1 was a marginally better predictor of memory performance at testing 2 than was length of coma. Results are discussed in terms of (a) utility of selective reminding parameters and predictors of outcome and (b) dissociations in recovery of memory parameters. 相似文献
4.
Bone and joint sepsis 总被引:1,自引:0,他引:1
5.
6.
目的由于卒中风险随着狭窄严重程度的增加而升高,因此认为颈内动脉(ICA)接近闭塞患者的卒中风险很高。在现有的随机试验中,还没有专门针对这种情况进行探讨,因此其处理尚存在争汶。方法:对相关文献进行系统评价。结果:对ICA接近闭塞患者的处理还存在争议:一些学者支持进行干预,而另一些学者则认为存在风险或没有益处而反对进行干预。在ICA接近闭塞的有症状患者中进行一项比较外科治疗与最佳内科治疗的多中心前瞻性随机试验似乎非常困难,因为这类研究需要大量的患者。尽管如此,基于目前的证据,似乎很难拒绝手术治疗。结论:由于目前对ICA接近闭塞患者的最佳处理方案仍存在着争议,因此需要前瞻性观察性研究以证实其在有症状和无症状人群中的患病率以及相关的卒中风险。基于目前的证据,大多数医疗中心选择手术治疗,但它相对干内科治疗的特粱尚右待证章. 相似文献
7.
8.
J W Shore C T Westfall C R Leone R K Newman F W Shagets 《Ophthalmic plastic and reconstructive surgery》1987,3(1):13-15
A 38-year-old man presented with hyperophthalmia, enophthalmos, and upper eyelid retraction 18 months following an osteoplastic flap and frontal sinus obliteration for mucocele. Computerized tomography confirmed the presence of frontal bone absorption in the roof of the orbit with traction and elevation of the orbital contents into the obliterated frontal sinus. A fracture of the orbital roof with penetration of periorbita at the time of original surgery was the suspected precipitating cause of the complication. Surgical management included lysis of the cicatrix between the orbit and frontal sinus and interposition of a silicone sheet between the orbit and sinus, which restored the appropriate anatomic relationships and prevented recurrence. 相似文献
9.
10.
Evolution of the extracorporeal shock wave lithotripsy technique involves not just second generation technology but operator innovations and experience. Retrospective analysis of the first 512 treatments at a university medical stone unit using the Dornier HM3 lithotriptor was compared to 3 intervals of 100 consecutive treatments during the next 2-year period (1985 to 1987). Patient referral and selection as well as treatment techniques and rates of endourological interventions were analyzed. Patient demographics, stone types and retreatment rates remained constant during 2,500 treatments. However, the use of local anesthesia and internal ureteral stents became increasingly common. Of the 1987 cohort 29% were treated with the patient under local anesthesia, and 23 of the 44 with a stent (52%) received internal ureteral stents. Other treatment trends identified during the study period included increasing number of large (greater than 2 cm.) and multiple stones treated; increasing use of internal and external ureteral catheters before treatment, fewer stents for small, mobile renal calculi and decreasing length of hospital stay (2.7 to 2.1 days) with increasing use of stents before lithotripsy. The increasing average number of shock waves per treatment (1,382 versus 1,580) during the study period can be attributed to the larger proportion of patients with high stone burdens and the impact of an increased number of operators with more varied criteria for endoscopy and treatment end point. 相似文献