全文获取类型
收费全文 | 51679篇 |
免费 | 6040篇 |
国内免费 | 4094篇 |
专业分类
耳鼻咽喉 | 448篇 |
儿科学 | 748篇 |
妇产科学 | 608篇 |
基础医学 | 5479篇 |
口腔科学 | 990篇 |
临床医学 | 6710篇 |
内科学 | 6939篇 |
皮肤病学 | 371篇 |
神经病学 | 2477篇 |
特种医学 | 1824篇 |
外国民族医学 | 33篇 |
外科学 | 4771篇 |
综合类 | 10592篇 |
现状与发展 | 19篇 |
一般理论 | 2篇 |
预防医学 | 3995篇 |
眼科学 | 1457篇 |
药学 | 6002篇 |
66篇 | |
中国医学 | 3908篇 |
肿瘤学 | 4374篇 |
出版年
2024年 | 100篇 |
2023年 | 915篇 |
2022年 | 1631篇 |
2021年 | 2781篇 |
2020年 | 2344篇 |
2019年 | 1962篇 |
2018年 | 1965篇 |
2017年 | 1969篇 |
2016年 | 1784篇 |
2015年 | 2769篇 |
2014年 | 3170篇 |
2013年 | 2988篇 |
2012年 | 4371篇 |
2011年 | 4598篇 |
2010年 | 3171篇 |
2009年 | 2731篇 |
2008年 | 3058篇 |
2007年 | 2782篇 |
2006年 | 2654篇 |
2005年 | 2377篇 |
2004年 | 1705篇 |
2003年 | 1608篇 |
2002年 | 1345篇 |
2001年 | 1123篇 |
2000年 | 1029篇 |
1999年 | 979篇 |
1998年 | 568篇 |
1997年 | 530篇 |
1996年 | 440篇 |
1995年 | 440篇 |
1994年 | 349篇 |
1993年 | 209篇 |
1992年 | 254篇 |
1991年 | 223篇 |
1990年 | 171篇 |
1989年 | 140篇 |
1988年 | 150篇 |
1987年 | 116篇 |
1986年 | 87篇 |
1985年 | 70篇 |
1984年 | 33篇 |
1983年 | 29篇 |
1982年 | 20篇 |
1981年 | 14篇 |
1980年 | 7篇 |
1979年 | 15篇 |
1978年 | 9篇 |
1972年 | 3篇 |
1970年 | 4篇 |
1966年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
43.
目的 了解早期全身运动(GMs)评估结果为异常/可疑的非脑瘫早产儿与筛查正常的早产儿在婴幼儿期神经、认知等各方面整体发育水平的差异,以探索GMs评估与儿童轻微神经功能障碍的关系。方法 选取2009-2017年在上海市闵行区妇幼保健院扭动阶段或不安阶段至少进行过1次GMs评估的早产儿,于矫正后9、12、24月龄评估其智力指数(MI)、发育商(DQ)。结果 单因素分析显示,扭动阶段/不安阶段结果为异常/可疑的非脑瘫早产儿与正常结果相比,MI与DQ差异均无统计学意义(P>0.05);多因素分析显示,不安运动结果为异常/可疑与正常相比,发育异常结局的可能性大(9月龄:OR=3.075,95%CI:1.013~9.331;12月龄:OR=3.638,95%CI:1.552~8.527;24月龄:OR=2.750,95%CI:1.213~6.242);不安运动评估结果对不同年龄发育异常结局预测的灵敏度较低(8.82%~18.60%),特异度较高(>95%)。结论 GMs评估在预测婴幼儿后期神经、运动发育情况存在局限性,不可取代后续的各类发育评估与监测。 相似文献
44.
45.
Yuan Zhang Ying Zheng Xuesong Yang Xuqing Liu Haiying Zhang Xiaoluan Xu Fankun Meng 《Ultrasound in medicine & biology》2019,45(3):684-692
The purpose of this study was to compare acoustic structure quantification (ASQ) with transient elastography for staging liver fibrosis. One hundred eighty-two patients with chronic hepatitis B and without moderate to severe hepatic steatosis scheduled for liver biopsy underwent ASQ and transient elastography examinations. All ASQ parameters, including total mode, total average, red mode, red average, red standard deviation, blue mode, blue average, blue standard deviation and focal disturbance (FD) ratio and liver stiffness obtained via transient elastography were found to correlate with fibrosis stage (Spearman's r?=?0.783, 0.791, 0.750, 0.771, 0.544, 0.718, 0.691, 0.439, 0.815 and 0.814, respectively; all p values < 0.001). Among the ASQ parameters, the FD ratio had the highest correlation with the stage of fibrosis. The areas under the receiver operating characteristic curves (AUCs) of FD ratio and liver stiffness were 0.911 and 0.906 for F ≥ F1, 0.918 and 0.882 for F ≥ F2, 0.911 and 0.914 for F ≥ F3 and 0.926 and 0.978 for F?=?F4, respectively. There was no significant difference in AUCs between FD ratio and liver stiffness in predicting different stages of fibrosis (p?=?0.062–0.912). ASQ is a promising technique for assessing liver fibrosis in the absence of moderate to severe hepatic steatosis. 相似文献
46.
Xin Yuan Xin Huang Ben Wang Yin‐xue Huang Yi‐ya Zhang Yan Tang Jin‐yan Yang Qi Chen Dan Jian Hong‐fu Xie Wei Shi Ji Li 《The Journal of dermatology》2019,46(3):219-225
Although patients with rosacea often consult dermatologists for dietary factors that might be related to their skin disorders, few studies have been conducted to research the relationship between rosacea and dietary factors. The purpose of this study was to evaluate the potential relationship between rosacea and diet among the large Chinese population with rosacea, which would provide dietary guidelines for patients with rosacea. A multicenter case–control study was conducted. The feeding frequency 2 years before the occurrence of rosacea was collected by standardized questionnaires. Multiple logistic regression analysis was used to calculate risks related to the diet. One thousand three hundred and forty‐seven patients with rosacea and 1290 controls were enrolled in our study. We found that high‐frequency intake of fatty food and tea presented a positive correlation with rosacea, while high‐frequency dairy product intake showed significant negative correlation with rosacea. Sweet food, coffee and spicy food appeared to be independent of any subset of rosacea in our study. However, high‐frequency dairy product intake showed a borderline beneficial effect on rosacea severity. We further analyzed the correlation between diet and the subtype of rosacea. We found that high‐frequency fatty intake was associated with erythematotelangiectatic rosacea (ETR) and phymatous rosacea, while high‐frequency tea intake was only associated with ETR. In addition, high‐frequency dairy product intake showed negative correlations with ETR and papulopustular rosacea. Rosacea is associated with some dietary factors, and our study is valuable in establishing dietary guidelines to prevent and improve rosacea. 相似文献
47.
48.
BackgroundAutoimmune hepatitis is a chronic inflammatory disease, the abnormal immunological function is the main pathogenesis. Interleukin-34 is a newly identified cytokine that shares the same receptor as colony stimulating factor-1.MethodsWe used interleukin-34 knockout and wild-type mice in a Con A-induced hepatitis model and cocultured RAW264.7 macrophage cells with interleukin-34. We then detected associated inflammatory cytokine and chemokine levels to elucidate the role of interleukin-34.ResultsIn this study, we found that the loss of interleukin-34 resulted in higher sensitivity to Con A-induced hepatitis. RAW264.7 macrophage cells were able to differentiate to the M2 phenotype upon interleukin-34 stimulation.ConclusionsWe conclude that interleukin-34 may protect the liver from Con A-mediated hepatitis by driving M2 macrophage polarization and suppressing inflammation. 相似文献
49.
50.