全文获取类型
收费全文 | 65503篇 |
免费 | 4046篇 |
国内免费 | 632篇 |
专业分类
耳鼻咽喉 | 1057篇 |
儿科学 | 921篇 |
妇产科学 | 1118篇 |
基础医学 | 11006篇 |
口腔科学 | 1576篇 |
临床医学 | 6118篇 |
内科学 | 12367篇 |
皮肤病学 | 2119篇 |
神经病学 | 5015篇 |
特种医学 | 3133篇 |
外科学 | 8333篇 |
综合类 | 274篇 |
现状与发展 | 1篇 |
一般理论 | 33篇 |
预防医学 | 3930篇 |
眼科学 | 1401篇 |
药学 | 5636篇 |
中国医学 | 656篇 |
肿瘤学 | 5487篇 |
出版年
2023年 | 417篇 |
2022年 | 1087篇 |
2021年 | 2517篇 |
2020年 | 1247篇 |
2019年 | 1646篇 |
2018年 | 2037篇 |
2017年 | 1512篇 |
2016年 | 2070篇 |
2015年 | 2871篇 |
2014年 | 3448篇 |
2013年 | 4062篇 |
2012年 | 6135篇 |
2011年 | 5620篇 |
2010年 | 3271篇 |
2009年 | 2731篇 |
2008年 | 4037篇 |
2007年 | 3710篇 |
2006年 | 3217篇 |
2005年 | 2890篇 |
2004年 | 2477篇 |
2003年 | 2129篇 |
2002年 | 1822篇 |
2001年 | 1405篇 |
2000年 | 1295篇 |
1999年 | 944篇 |
1998年 | 430篇 |
1997年 | 318篇 |
1996年 | 268篇 |
1995年 | 227篇 |
1994年 | 188篇 |
1993年 | 177篇 |
1992年 | 364篇 |
1991年 | 346篇 |
1990年 | 306篇 |
1989年 | 282篇 |
1988年 | 274篇 |
1987年 | 276篇 |
1986年 | 202篇 |
1985年 | 191篇 |
1984年 | 152篇 |
1983年 | 150篇 |
1982年 | 90篇 |
1981年 | 93篇 |
1980年 | 82篇 |
1979年 | 94篇 |
1978年 | 85篇 |
1975年 | 64篇 |
1974年 | 71篇 |
1973年 | 66篇 |
1970年 | 60篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
Association of low baseline free thyroxin levels with progression of coronary artery calcification over 4 years in euthyroid subjects: the Kangbuk Samsung Health Study 下载免费PDF全文
993.
994.
Robotic left colectomy with complete mesocolectomy for splenic flexure and descending colon cancer,compared with a laparoscopic procedure 下载免费PDF全文
995.
Ok-Seon Kwon Ensel Oh Jeong-Rak Park Ji-Seon Lee Gab-Yong Bae Jae-Hyung Koo Hyongbum Kim Yoon-La Choi Young Soo Choi Jhingook Kim Hyuk-Jin Cha 《Oncotarget》2015,6(39):41916-41928
While metastasis, the main cause of lung cancer-related death, has been extensively studied, the underlying molecular mechanism remains unclear. A previous clinicogenomic study revealed that expression of N-acetylgalactosaminyltransferase (GalNAc-T14), is highly inversely correlated with recurrence-free survival in those with non-small cell lung cancer (NSCLC). However, the underlying molecular mechanism(s) has not been determined. Here, we showed that GalNAc-T14 expression was positively associated with the invasive phenotype. Microarray and biochemical analyses revealed that HOXB9, the expression of which was increased in a GalNAc-T14-dependent manner, played an important role in metastasis. GalNAc-T14 increased the sensitivity of the WNT response and increased the stability of the β-catenin protein, leading to induced expression of HOXB9 and acquisition of an invasive phenotype. Pharmacological inhibition of β-catenin in GalNAc-T14-expressing cancer cells suppressed HOXB9 expression and invasion. A meta-analysis of clinical genomics data revealed that expression of GalNAc-T14 or HOXB9 was strongly correlated with reduced recurrence-free survival and increased hazard risk, suggesting that targeting β-catenin within the GalNAc-T14/WNT/HOXB9 axis may be a novel therapeutic approach to inhibit metastasis in NSCLC. 相似文献
996.
997.
998.
Jing Gao Wen He Li-Juan Du Johnson Chen David Park Michael Wells Brian Fowlkes Michael ODell 《Ultrasound in medicine & biology》2018,44(9):1931-1940
We prospectively investigated the feasibility of using quantitative ultrasound imaging (QUI) to assess the biceps brachii muscle (BBM) in individuals with chronic post-stroke spasticity. To quantify muscle echogenicity and stiffness, we measured QUI parameters (gray-scale pixel value and shear wave velocity [SWV, m/s]) of the BBM in three groups: 16 healthy BBMs; 12 post-stroke, non-spastic BBMs; and 12 post-stroke, spastic BBMs. The QUI results were compared with the Modified Ashworth Scale and Tardieu Scale. A total of 20 SWVs were measured in each BBM, once at elbow in 90° flexion and again at maximally achievable extension using acoustic radiation force impulse imaging. BBM pixel value was measured in gray-scale images captured at 90° elbow flexion using ImageJ software. Statistical analyses included analysis of variance for examining the difference in SWV and pixel values among the three groups; Bonferroni correction for testing the difference in SWV and pixel values in a paired group; t-test for examining the difference in SWV values measured at two elbow angles; and Pearson correlation coefficient for analyzing the correlation of QUI to Modified Ashworth Scale and Tardieu Scale. SWV significantly differed between spastic BBMs and non-spastic or healthy BBMs. For pixel values, each of the three groups significantly differed from the others at elbow 90° flexion. The difference in SWV measured between the two elbow angles was also significant (p?<0.01). A strong negative correlation was found between SWV and passive range of motion (R2?=??0.88, p?<0.0001) in spastic upper limbs. These results suggest that the use of QUI is feasible in quantitative assessment of spastic BBM. 相似文献
999.
Estimation of cost savings between 2011 and 2014 attributed to infliximab biosimilar in the South Korean healthcare market: real‐world evidence using a nationwide database 下载免费PDF全文
1000.