全文获取类型
收费全文 | 42747篇 |
免费 | 2046篇 |
国内免费 | 152篇 |
专业分类
耳鼻咽喉 | 325篇 |
儿科学 | 1291篇 |
妇产科学 | 1465篇 |
基础医学 | 5411篇 |
口腔科学 | 2486篇 |
临床医学 | 4594篇 |
内科学 | 6607篇 |
皮肤病学 | 919篇 |
神经病学 | 2992篇 |
特种医学 | 1616篇 |
外国民族医学 | 10篇 |
外科学 | 5370篇 |
综合类 | 779篇 |
一般理论 | 22篇 |
预防医学 | 3712篇 |
眼科学 | 1323篇 |
药学 | 3870篇 |
中国医学 | 444篇 |
肿瘤学 | 1709篇 |
出版年
2023年 | 1449篇 |
2022年 | 2121篇 |
2021年 | 2245篇 |
2020年 | 3018篇 |
2019年 | 1878篇 |
2018年 | 2255篇 |
2017年 | 2262篇 |
2016年 | 1989篇 |
2015年 | 1441篇 |
2014年 | 3105篇 |
2013年 | 2522篇 |
2012年 | 3219篇 |
2011年 | 3295篇 |
2010年 | 2531篇 |
2009年 | 2122篇 |
2008年 | 2080篇 |
2007年 | 2072篇 |
2006年 | 1530篇 |
2005年 | 1079篇 |
2004年 | 676篇 |
2003年 | 548篇 |
2002年 | 348篇 |
2001年 | 244篇 |
2000年 | 192篇 |
1999年 | 142篇 |
1998年 | 30篇 |
1997年 | 24篇 |
1996年 | 18篇 |
1995年 | 17篇 |
1994年 | 19篇 |
1993年 | 12篇 |
1992年 | 43篇 |
1991年 | 34篇 |
1990年 | 23篇 |
1989年 | 19篇 |
1988年 | 28篇 |
1987年 | 10篇 |
1985年 | 7篇 |
1984年 | 11篇 |
1983年 | 9篇 |
1982年 | 22篇 |
1981年 | 17篇 |
1980年 | 19篇 |
1979年 | 30篇 |
1978年 | 26篇 |
1977年 | 30篇 |
1976年 | 28篇 |
1975年 | 18篇 |
1974年 | 15篇 |
1973年 | 12篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
《Arab Journal Of Gastroenterology》2022,23(2):89-94
Background and study aimsPregnancy in association with cirrhosis is a rather uncommon and highly risky situation for both mother and child. We aim to study all factors and the utility of liver stiffness (LS) measurement by Acoustic Radiation Force Impulse elastography (ARFI) to predict hepatic decompensation in pregnant cirrhotic patients.Patients and methodsWe prospectively recruited 224 pregnant women at the multidisciplinary clinic of liver disease with pregnancy, Cairo University. LS was measured using ARFI (Siemens ACUSON S3000 ultrasound system) during the second trimester and 8–12 weeks post-delivery. The outcome of pregnancy and the incidence of hepatic decompensation were assessed.ResultsOur cohort comprised 128 normal pregnancies, 37 patients with pregnancy-related liver disease (Intrahepatic cholestasis (n = 6), preeclampsia (n = 23), and hyperemesis gravidarum (n = 8)) and 59 patients with an established chronic liver disease not related to pregnancy. In all patients, LS significantly decreased after delivery from 1.19 m/s to 0.94 m/s (P < 0.001). In multivariate analysis, LS was an independent predictor for the outcome of pregnancy in all patients (odds ratio (OR) = 5.442 (3.01–6.82), cut-off = 1.21 m/s). Patients with cirrhosis, mean LS was 1.57 ± 0.66 m/s and 26 (44%) patients had hepatic decompensation (hepatocellular jaundice (n = 8), ascites (n = 9) and variceal bleeding (n = 6)). In multivariate analysis; LS, platelets, albumin, and bilirubin were independent predictors of decompensation post-delivery and the OR for LS was 6.141(4.32–7.98). The optimal cut off value of LS to predict decompensation was 1.46 m/s (8.4 kPa) with AUROC of 0.827.ConclusionLS can be used to predict hepatic decompensation after delivery in pregnant women with manifest cirrhosis. 相似文献
3.
4.
《Journal of pharmaceutical sciences》2022,111(11):3029-3037
This study aimed to characterize a stable nano-niosome formulation, which could reduce the adverse effects of carboplatin (CB) and improve its therapeutic efficacy in the treatment of breast cancer. For this purpose, CB-loaded polyethylene glycol (PEG)ylated niosome nanoparticles (PEG-NS-CB) were synthesized using the reverse-phase evaporation method. PEG-NS-CB (226.0 ± 10.6 nm) could release CB in a controlled manner and, compared to CB and CB-loaded non-PEGylated niosome (NS-CB), caused higher cytotoxicity effects against mouse breast cancer 4T1 cells (IC50: 83.4, 26.6, and 22.5 µM for CB, NS-CB, and PEG-NS-CB, respectively). Also, PEG-NS-CB demonstrated higher stability, in which its profile of drug release, cytotoxicity, and LE% did not change significantly three months after preparation compared to those at the production time. In addition, the in vivo results demonstrated that PEG-NS-CB caused higher therapeutic (the number of alive mice: 12, 15, and 17 out of 20 in CB, NS-CB, and PEG-NS-CB receiver groups, respectively) and less toxicity effects (weight loss of 17, 12.5, and 10% in CB, NS-CB, and PEG-NS-CB receiver groups, respectively), compared to NS-CB and CB in breast cancer-bearing mice. Overall, the results of this study suggest that PEG-NS-CB could be a promising formulation for the treatment of breast cancer. 相似文献
5.
Clinical Effectiveness of Erlova in EGFR-Mutated Non-Small Cell Lung Cancer: An Affordable Price with Clinical Benefit 下载免费PDF全文
Sharareh SeifiBabak SalimiZahra Esfahani-MonfaredRamin RadmaneshSaeed YaghoubifardSara TalebianpourAdnan Khosravi 《Asian Pacific journal of cancer prevention》2022,23(4):1155-1158
Background: Thyrosin kinase inhibitors (TKIs) is approved for the first line treatment of non-small cell lung cancer (NSCLC) patients with epidermal growth factor receptor (EGFR) mutation. This study performed to assess clinical effectiveness and safety of Erlova (generic form of Erlotinib). Methods: Somatic mutations of EGFR gene were studied in tumor tissue by polymerase chain reaction (PCR) and bi-directional sequencing in 513 chemonaive and histologically verified lung adenocarcinoma Iranian patients. Patients with EGFR mutation received Erlova at 150 mg/day as first line treatment. Primary endpoint was progression free survival (PFS). Results: About 21% (n=109) cases had EGFR mutation. Most EGFR mutations were occurred at exon 19. Among them, sixty nine patients treated with Erlova. Median PFS was 11.4 months and objective response rate (ORR) was about 88%. Most frequent treatment related adverse events was skin rash. Conclusion: Our findings showed Erlova had remarkable effectiveness. In mutation-positive patients with EGFR, Erlova can be used safely instead of other tyrosine-kinase inhibitors. 相似文献
6.
《Immunobiology》2022,227(3):152211
ObjectiveThe present study was intended to investigate the role of embryonic stem cell-derived exosomes (ESC-Exos) in Müller cell retrodifferentiation and their specific mechanism.MethodsFollowing co-incubation of the extracted ESC-Exos and Müller cells, their effects on the retrodifferentiation and proliferation of Müller cells were measured by EdU staining, immunofluorescence, and western blot. ESCs transfected with small interfering RNA of BDNF were co-incubated with Müller cells to determine Müller cell proliferation and retrodifferentiation. β-catenin expression in the nucleus and GSK-3β phosphorylation were measured to determine the role of the Wnt pathway in Müller cells. The function of the retina in RCS rats was observed using flash electroretinogram.ResultsCo-incubation of ESCs with Müller cells or overexpression of BDNF contributed to Müller cell retrodifferentiation and proliferation, as evidenced by increased cell proliferation, fluorescence intensities of proliferation markers and retinal stem cell markers, and expression of BDNF and β-catenin, and suppressed GSK-3β phosphorylation. However, co-incubation with ESCs silencing BDNF or treatment with GW4869 inhibited the proliferation and retrodifferentiation of retinal Müller cells. In addition, exosome injection increased BDNF, BrdU, PH3, SOX2, and Pax6 expression, enhanced β-catenin expression in the nucleus, diminished GSK-3β, and improved retinal degeneration in RCS rats.ConclusionESC-Exos accelerated Müller cell retrodifferentiation and proliferation through Wnt pathway activation by delivering BDNF protein to Müller cells. 相似文献
7.
《Current problems in cardiology》2022,47(10):100929
Neutrophil extracellular traps (NETs) are net-like chromatin fibers that are released from dying neutrophils during infections. NETs are a sort of scaffold, ideal to retain microbes. The main function of NETs is the trapping and killing pathogens, as such as bacteria, fungi, viruses (including SARS-CoV-2) and protozoa. The death of neutrophils via NETs formation is called “NETosis.” Nevertheless, recent studies suggest that NETosis is involved in several diseases, other than infections. Very recently, it has been shown that NETs formation contributes to venous thromboembolism but also to atherosclerosis progression, creating a link between venous and arterial thrombosis. The presence of NETs in the luminal portion of human atherosclerotic vessels and coronary specimens obtained from patients after acute myocardial infarction has been detected. This review provides evidence of the most important updates about the role of NETs in myocardial infarction, in heart failure and in the process of atherosclerosis itself. The prognostic significance of NETs-related markers in cardiovascular diseases will be discussed, in order to assess targeted therapeutic strategies. 相似文献
8.
《Survey of ophthalmology》2023,68(4):628-640
Tamoxifen (TAM) is a selective estrogen receptor modulator that is used in the treatment of breast cancer. As there are estrogen receptors in the retina, retinal pigment epithelium, and choroid, these tissues may also be affected by TAM. We describe the reported effects of TAM on the retina and choroid. Medical databases were searched using relevant keywords and the results were extracted and pooled. The incidence of retinal/choroidal toxicity ranged from 0.9% to 12%. There was a wide range for the time of exposure before the development of TAM retinopathy (3 weeks to 13 years). While functional measurements may be appropriate for assessment of TAM retinopathy, they have not been effective for screening patients. There is no generally accepted screening modality, but serial funduscopy and optical coherence tomography imaging seem to be the most reasonable approach for detecting early TAM-induced retinal toxicity. 相似文献
9.
10.