全文获取类型
收费全文 | 134699篇 |
免费 | 8272篇 |
国内免费 | 1245篇 |
专业分类
耳鼻咽喉 | 2081篇 |
儿科学 | 2135篇 |
妇产科学 | 2051篇 |
基础医学 | 21525篇 |
口腔科学 | 3197篇 |
临床医学 | 12503篇 |
内科学 | 24512篇 |
皮肤病学 | 4304篇 |
神经病学 | 10975篇 |
特种医学 | 7583篇 |
外科学 | 17756篇 |
综合类 | 609篇 |
现状与发展 | 3篇 |
一般理论 | 28篇 |
预防医学 | 7079篇 |
眼科学 | 3445篇 |
药学 | 12052篇 |
中国医学 | 1519篇 |
肿瘤学 | 10859篇 |
出版年
2023年 | 950篇 |
2022年 | 2877篇 |
2021年 | 4651篇 |
2020年 | 2270篇 |
2019年 | 3143篇 |
2018年 | 3916篇 |
2017年 | 3201篇 |
2016年 | 4181篇 |
2015年 | 5796篇 |
2014年 | 6885篇 |
2013年 | 8031篇 |
2012年 | 11942篇 |
2011年 | 11435篇 |
2010年 | 6594篇 |
2009年 | 5692篇 |
2008年 | 8046篇 |
2007年 | 7602篇 |
2006年 | 6884篇 |
2005年 | 6358篇 |
2004年 | 5554篇 |
2003年 | 4846篇 |
2002年 | 4189篇 |
2001年 | 3200篇 |
2000年 | 2960篇 |
1999年 | 2271篇 |
1998年 | 964篇 |
1997年 | 729篇 |
1996年 | 548篇 |
1995年 | 481篇 |
1994年 | 407篇 |
1993年 | 355篇 |
1992年 | 783篇 |
1991年 | 749篇 |
1990年 | 669篇 |
1989年 | 596篇 |
1988年 | 512篇 |
1987年 | 499篇 |
1986年 | 356篇 |
1985年 | 388篇 |
1984年 | 276篇 |
1983年 | 214篇 |
1982年 | 142篇 |
1981年 | 176篇 |
1980年 | 144篇 |
1979年 | 247篇 |
1978年 | 185篇 |
1977年 | 143篇 |
1976年 | 144篇 |
1974年 | 150篇 |
1973年 | 130篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
Paul Tetteh Asare Nadeeka Bandara Tae-Yong Jeong Sangryeol Ryu Jochen Klumpp Kwang-Pyo Kim 《Archives of virology》2015,160(10):2647-2650
33.
Cheong-Il Shin Sang Joon Park Ji-Hyun Kim Yeonyee Elizabeth Yoon Eun-Ah Park Bon-Kwon Koo Whal Lee 《Korean journal of radiology》2021,22(5):688
ObjectiveTo compare the lumen parameters measured by the location-adaptive threshold method (LATM), in which the inter- and intra-scan attenuation variabilities of coronary computed tomographic angiography (CCTA) were corrected, and the scan-adaptive threshold method (SATM), in which only the inter-scan variability was corrected, with the reference standard measurement by intravascular ultrasonography (IVUS).Materials and MethodsThe Hounsfield unit (HU) values of whole voxels and the centerline in each of the cross-sections of the 22 target coronary artery segments were obtained from 15 patients between March 2009 and June 2010, in addition to the corresponding voxel size. Lumen volume was calculated mathematically as the voxel volume multiplied by the number of voxels with HU within a given range, defined as the lumen for each method, and compared with the IVUS-derived reference standard. Subgroup analysis of the lumen area was performed to investigate the effect of lumen size on the studied methods. Bland-Altman plots were used to evaluate the agreement between the measurements.ResultsLumen volumes measured by SATM was significantly smaller than that measured by IVUS (mean difference, 14.6 mm3; 95% confidence interval [CI], 4.9–24.3 mm3); the lumen volumes measured by LATM and IVUS were not significantly different (mean difference, −0.7 mm3; 95% CI, −9.1–7.7 mm3). The lumen area measured by SATM was significantly smaller than that measured by LATM in the smaller lumen area group (mean of difference, 1.07 mm2; 95% CI, 0.89–1.25 mm2) but not in the larger lumen area group (mean of difference, −0.07 mm2; 95% CI, −0.22–0.08 mm2). In the smaller lumen group, the mean difference was lower in the Bland-Altman plot of IVUS and LATM (0.46 mm2; 95% CI, 0.27–0.65 mm2) than in that of IVUS and SATM (1.53 mm2; 95% CI, 1.27–1.79 mm2).ConclusionSATM underestimated the lumen parameters for computed lumen segmentation in CCTA, and this may be overcome by using LATM. 相似文献
34.
35.
Widely Metastatic Squamous Cell Carcinoma Originating from Malignant Transformation of Hypertrophic Lichen Planus in a 24‐Year‐Old Woman: Case Report and Review of the Literature
下载免费PDF全文
![点击此处可从《Pediatric dermatology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Lana X. Tong B.A. Matthew J. Weinstock M.D. Reed Drews M.D. Caroline C. Kim M.D. 《Pediatric dermatology》2015,32(3):e98-e101
Hypertrophic lichen planus (HLP) is a T‐cell‐mediated process typically presenting with hypertrophic or verrucous plaques on the lower limbs. We report the case of a 24‐year‐old woman with a history of HLP since age 3 years presenting with rapid malignant transformation of one lesion into a large squamous cell carcinoma (SCC). Subsequent examination revealed progressive, widespread metastatic involvement, and the patient ultimately died from her disease. SCC associated with HLP is rare, with a review of the literature revealing fewer than 50 cases. This case highlights the need to be aware of suspicious changes in HLP and to educate patients as to when to be reevaluated. 相似文献
36.
37.
Anders Elm Pedersen Esben Gjerløff Wedebye Schmidt Jesper Freddie Sørensen Carsten Faber Boye Schnack Nielsen Kim Holmstrøm Silje Haukali Omland Peter Tougaard Søren Skov Bo Bang 《APMIS : acta pathologica, microbiologica, et immunologica Scandinavica》2015,123(7):547-555
TL1A is a TNF‐like cytokine which has been shown to co‐stimulate TH1 and TH17 responses during chronic inflammation. The expression of this novel cytokine has been investigated in inflammatory disorders like rheumatoid arthritis and inflammatory bowel disease, but little is known about expression and induction in psoriasis. Indeed, the pathogenesis in psoriasis is still not fully understood and it is speculated that cytokines other than TNF‐α are important in subsets of patients. Also, for patients with severe disease that are treated with systemic anti‐TNF‐α blockade, novel candidates to be used as disease and response biomarkers are of high interest. Here, we demonstrate TL1A expression in biopsies from psoriatic lesions. Also, we investigated spontaneous and induced TL1A secretion from PBMCs and blood levels from a cohort of psoriasis patients. Here, increased spontaneous secretion from PBMCs was observed as compared to healthy controls and a small subset of patients had highly elevated TL1A in the blood. Interestingly, activation of PBMCs with various cytokines showed a decreased sensitivity for TL1A activation in psoriasis patients compared to healthy controls.TL1A levels in blood and biopsies could not be correlated with disease activity with this patient cohort. Thus, additional large‐scale studies are warranted to investigate TL1A as a biomarker. 相似文献
38.
39.
40.
Yeon Seok Lee June Hyunkyung Lee Jae Eun Choi Joo Young Kim Tae Young Han 《Pediatric dermatology》2021,38(1):290-291
Erythema induratum of Bazin (EIB) is a form of tuberculid resulting from hypersensitivity to tuberculosis antigen. EIB occurs most commonly in middle‐aged women and is not typically seen in children. Here, we present a rare case of EIB, presenting as a chronic nodular panniculitis, in a 10‐year‐old Korean boy. 相似文献