全文获取类型
收费全文 | 172653篇 |
免费 | 15032篇 |
国内免费 | 7373篇 |
专业分类
耳鼻咽喉 | 1440篇 |
儿科学 | 3232篇 |
妇产科学 | 2591篇 |
基础医学 | 24913篇 |
口腔科学 | 3461篇 |
临床医学 | 14432篇 |
内科学 | 27037篇 |
皮肤病学 | 2881篇 |
神经病学 | 12598篇 |
特种医学 | 3312篇 |
外国民族医学 | 54篇 |
外科学 | 13401篇 |
综合类 | 26574篇 |
现状与发展 | 27篇 |
预防医学 | 11736篇 |
眼科学 | 3865篇 |
药学 | 22215篇 |
43篇 | |
中国医学 | 7047篇 |
肿瘤学 | 14199篇 |
出版年
2024年 | 443篇 |
2023年 | 2530篇 |
2022年 | 5292篇 |
2021年 | 6465篇 |
2020年 | 5651篇 |
2019年 | 5536篇 |
2018年 | 5562篇 |
2017年 | 6140篇 |
2016年 | 6185篇 |
2015年 | 6444篇 |
2014年 | 10716篇 |
2013年 | 12752篇 |
2012年 | 11370篇 |
2011年 | 12466篇 |
2010年 | 10147篇 |
2009年 | 9633篇 |
2008年 | 9523篇 |
2007年 | 8899篇 |
2006年 | 8009篇 |
2005年 | 6972篇 |
2004年 | 6080篇 |
2003年 | 5187篇 |
2002年 | 4261篇 |
2001年 | 3566篇 |
2000年 | 3070篇 |
1999年 | 2631篇 |
1998年 | 2380篇 |
1997年 | 2082篇 |
1996年 | 1836篇 |
1995年 | 1729篇 |
1994年 | 1417篇 |
1993年 | 1191篇 |
1992年 | 1008篇 |
1991年 | 838篇 |
1990年 | 767篇 |
1989年 | 601篇 |
1988年 | 479篇 |
1987年 | 427篇 |
1986年 | 393篇 |
1985年 | 692篇 |
1984年 | 716篇 |
1983年 | 473篇 |
1982年 | 560篇 |
1981年 | 394篇 |
1980年 | 372篇 |
1979年 | 280篇 |
1978年 | 199篇 |
1977年 | 183篇 |
1976年 | 179篇 |
1975年 | 132篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
31.
32.
《Diagnostic and interventional imaging》2020,101(9):555-564
PurposeThe purpose of this study was to determine whether computed tomography (CT)-based machine learning of radiomics features could help distinguish autoimmune pancreatitis (AIP) from pancreatic ductal adenocarcinoma (PDAC).Materials and MethodsEighty-nine patients with AIP (65 men, 24 women; mean age, 59.7 ± 13.9 [SD] years; range: 21–83 years) and 93 patients with PDAC (68 men, 25 women; mean age, 60.1 ± 12.3 [SD] years; range: 36–86 years) were retrospectively included. All patients had dedicated dual-phase pancreatic protocol CT between 2004 and 2018. Thin-slice images (0.75/0.5 mm thickness/increment) were compared with thick-slices images (3 or 5 mm thickness/increment). Pancreatic regions involved by PDAC or AIP (areas of enlargement, altered enhancement, effacement of pancreatic duct) as well as uninvolved parenchyma were segmented as three-dimensional volumes. Four hundred and thirty-one radiomics features were extracted and a random forest was used to distinguish AIP from PDAC. CT data of 60 AIP and 60 PDAC patients were used for training and those of 29 AIP and 33 PDAC independent patients were used for testing.ResultsThe pancreas was diffusely involved in 37 (37/89; 41.6%) patients with AIP and not diffusely in 52 (52/89; 58.4%) patients. Using machine learning, 95.2% (59/62; 95% confidence interval [CI]: 89.8–100%), 83.9% (52:67; 95% CI: 74.7–93.0%) and 77.4% (48/62; 95% CI: 67.0–87.8%) of the 62 test patients were correctly classified as either having PDAC or AIP with thin-slice venous phase, thin-slice arterial phase, and thick-slice venous phase CT, respectively. Three of the 29 patients with AIP (3/29; 10.3%) were incorrectly classified as having PDAC but all 33 patients with PDAC (33/33; 100%) were correctly classified with thin-slice venous phase with 89.7% sensitivity (26/29; 95% CI: 78.6–100%) and 100% specificity (33/33; 95% CI: 93–100%) for the diagnosis of AIP, 95.2% accuracy (59/62; 95% CI: 89.8–100%) and area under the curve of 0.975 (95% CI: 0.936–1.0).ConclusionsRadiomic features help differentiate AIP from PDAC with an overall accuracy of 95.2%. 相似文献
33.
Ahmed M. Abu El-Asrar Ajmal Ahmad Eef Allegaert Mohammad Mairaj Siddiquei Priscilla W. Gikandi Gert De Hertogh 《Ocular immunology and inflammation》2020,28(4):575-588
ABSTRACT
Purpose
To investigate the expression of IL-11 and its receptor IL-11Rα and to quantify density of CD163+ M2 macrophages in proliferative diabetic retinopathy (PDR). 相似文献34.
目的探讨单纯 Ilizarov 环形外固定技术治疗合并骨筋膜室综合征的胫骨平台骨折的疗效。方法2013 年 9 月—2017 年 3 月,收治 30 例合并骨筋膜室综合征的胫骨平台骨折患者,采用单纯 Ilizarov 环形外固定技术治疗。男 23 例,女 7 例;年龄 23~43 岁,平均 34.4 岁。致伤原因:交通事故伤 12 例,高处坠落伤 4 例,摔伤 8 例,重物砸伤 6 例。受伤至入院时间 1~12 h,平均 4.8 h。骨折 Schatzker 分型:Ⅱ型 1 例、Ⅲ型 3 例、Ⅳ型 10 例、Ⅴ型 7 例、Ⅵ型 9 例。30 例均因骨筋膜室综合征行切开减压;切开减压至手术时间为 10~15 d,平均 12.5 d。治疗后采用膝关节学会评分系统(KSS)及 Ilizarov 方法研究与应用协会(ASAMI)协议评价膝关节功能。结果手术时间 110~155 min,平均 123.1 min;术中出血量 100~500 mL,平均 245 mL;术后住院时间 3~5 d,平均 3.8 d。患者均获随访,随访时间 20~24 周,平均 22.7 周。除 2 例患者出现针道感染征象外,无其他并发症发生。X 线片复查显示骨折均愈合,愈合时间 10~20 周,平均 14.6 周。末次随访时,膝关节 KSS 临床评分总分为 70~95 分,平均 87.5 分;功能评分总分为 70~90 分,平均 79.0 分。参照 ASAMI 协议评价获优 24 例、良 3 例、可 2 例、差 1 例。结论对于合并骨筋膜室综合征的胫骨平台骨折,单纯 Ilizarov 环形外固定技术治疗后患者关节功能可以基本恢复且并发症少,是一项相对安全、有效的治疗方法。 相似文献
35.
Primary cutaneous anaplastic large cell lymphomas with 6p25.3 rearrangement exhibit particular histological features 下载免费PDF全文
36.
37.
JeongYun Choi Haeseung Lee EunJi Kwon HyeonJoon Kong OkSeon Kwon HyukJin Cha 《Molecular oncology》2021,15(2):679
The acquisition of chemoresistance remains a major cause of cancer mortality due to the limited accessibility of targeted or immune therapies. However, given that severe alterations of molecular features during epithelial‐to‐mesenchymal transition (EMT) lead to acquired chemoresistance, emerging studies have focused on identifying targetable drivers associated with acquired chemoresistance. Particularly, AXL, a key receptor tyrosine kinase that confers resistance against targets and chemotherapeutics, is highly expressed in mesenchymal cancer cells. However, the underlying mechanism of AXL induction in mesenchymal cancer cells is poorly understood. Our study revealed that the YAP signature, which was highly enriched in mesenchymal‐type lung cancer, was closely correlated to AXL expression in 181 lung cancer cell lines. Moreover, using isogenic lung cancer cell pairs, we also found that doxorubicin treatment induced YAP nuclear translocation in mesenchymal‐type lung cancer cells to induce AXL expression. Additionally, the concurrent activation of TGFβ signaling coordinated YAP‐dependent AXL expression through SMAD4. These data suggest that crosstalk between YAP and the TGFβ/SMAD axis upon treatment with chemotherapeutics might be a promising target to improve chemosensitivity in mesenchymal‐type lung cancer.
Abbreviations
- AUC
- area under the curve
- AXL
- AXL receptor tyrosine kinase
- BCL2
- B‐cell lymphoma 2
- CTD2
- cancer target discovery and development
- CTGF
- connective tissue growth factor
- DEG
- differentially expressed genes
- DOXO
- doxorubicin
- EMT
- epithelial–mesenchymal transition
- Eto
- etoposide
- FDA
- Food and Drug Administration
- ITGB3
- integrin beta‐3
- MAPK
- mitogen‐activated protein kinase
- MMP2
- matrix metalloproteinase‐2
- MMP9
- matrix metalloproteinase‐9
- mRNA
- messenger RNA
- NF‐κB
- nuclear factor kappa‐light‐chain‐enhancer of activated B cells
- SBE
- SMAD binding element
- SERPINE1
- serpin family E member 1
- siRNA
- small interfering RNA
- ssGSEA
- single‐sample gene set enrichment analysis
- TCGA
- The Cancer Genome Atlas
- TGFβ
- transforming growth factor beta
- YAP
- Yes‐associated protein
- YAP8SA
- mutants of inhibitory phosphorylation site at eight serine to Alanine of YAP
- ZEB1
- zinc finger E‐box binding homeobox 1
- ZEB2
- zinc finger E‐box‐binding homeobox 2
38.
《Journal of vascular surgery》2020,71(6):1921-1929
ObjectiveIdentifying biomarkers for abdominal aortic aneurysms (AAA) could prove beneficial in prognosis of AAA and thus the selection for treatment. Microfibrillar-associated protein 4 (MFAP4) is an extracellular matrix protein that is highly expressed in aorta. MFAP4 is involved in several tissue remodeling-related diseases. We aimed to investigate the potential role of plasma MFAP4 (pMFAP4) as a biomarker of AAA.MethodsPlasma samples and data were obtained for 504 male AAA patients and 188 controls in the Viborg Vascular (VIVA) screening trial. The pMFAP4 levels were measured by Alphalisa. The Mann-Whitney U test assessed differences in pMFAP4 levels between the presence and absence of different exposures of interest. The correlation between pMFAP4 and aorta growth rate were investigated through spearman's correlation analysis. Immunohistochemistry and multiple logistic regression adjusted for potential confounders assessed the association between pMFAP4 and AAA. Multiple linear regression assessed the correlation between pMFAP4 and aorta growth rate. Cox regression and competing risk regression were used to investigate the correlation between AAA patients with upper tertile pMFAP4 and the risk of undergoing later surgical repair.ResultsA significant negative correlation between pMFAP4 and aorta growth rate was observed using spearman's correlation analysis (ρ = −0.14; P = .0074). However, this finding did not reach significance when applying multiple linear regression. A tendency of decreased pMFAP4 was observed in AAA using immunohistochemistry. Competing risk regression adjusted for potential confounders indicated that patients with upper tertile pMFAP4 had a hazard ratio of 0.51 (P = .001) for risk of undergoing later surgical repair.ConclusionsHigh levels of pMFAP4 are associated with a decreased likelihood of receiving surgical repair in AAA. This observation warrants confirmation in an independent cohort. 相似文献
39.
40.
A growing body of data suggests that therapies based on Toll-like receptors (TLR) targeting, in particular TLR4, holds promise in curing autoimmune and inflammatory pathologies still lacking specific treatment, included several rare diseases. While TLR4 activators (agonists) have already found successful clinical application as vaccine adjuvants, the use of TLR4 blockers (antagonists) as antisepsis agents or as agents against inflammatory diseases (including arthritis, multiple sclerosis, neuroinflammations) and cancer is still at a preclinical phase of development. This minireview focuses on recent achievements on the development of TLR4 modulators based on lipid A structure simplification, in particular on compounds having disaccharide or monosaccharide structures. As the TLR4 activity of natural TLR4 ligands (lipopolysaccharide, LPS and its biologically active part, the lipid A) depends on both the structure of endotoxin aggregates in solution and on single-molecule interaction with MD-2 and CD14 receptors, the rational design of TLR4 modulators should in principle take into account both these factors. In the light of the most recent advances in the field, in this minireview we discuss the structure–activity relationship in simplified lipid A analogs, with cationic or anionic amphiphilic structures. 相似文献