全文获取类型
收费全文 | 586篇 |
免费 | 50篇 |
国内免费 | 2篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 18篇 |
妇产科学 | 8篇 |
基础医学 | 52篇 |
口腔科学 | 9篇 |
临床医学 | 72篇 |
内科学 | 130篇 |
皮肤病学 | 19篇 |
神经病学 | 28篇 |
特种医学 | 13篇 |
外科学 | 89篇 |
综合类 | 10篇 |
一般理论 | 9篇 |
预防医学 | 78篇 |
眼科学 | 32篇 |
药学 | 31篇 |
中国医学 | 7篇 |
肿瘤学 | 30篇 |
出版年
2024年 | 1篇 |
2023年 | 20篇 |
2022年 | 9篇 |
2021年 | 43篇 |
2020年 | 41篇 |
2019年 | 34篇 |
2018年 | 44篇 |
2017年 | 23篇 |
2016年 | 29篇 |
2015年 | 37篇 |
2014年 | 34篇 |
2013年 | 41篇 |
2012年 | 52篇 |
2011年 | 51篇 |
2010年 | 25篇 |
2009年 | 10篇 |
2008年 | 31篇 |
2007年 | 29篇 |
2006年 | 27篇 |
2005年 | 20篇 |
2004年 | 16篇 |
2003年 | 8篇 |
2002年 | 4篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 3篇 |
1996年 | 2篇 |
1994年 | 1篇 |
排序方式: 共有638条查询结果,搜索用时 187 毫秒
31.
Somayeh Tajik Hadi Beitollahi Fariba Garkani Nejad Iran Sheikh Shoaie Mohammad A. Khalilzadeh Mehdi Shahedi Asl Quyet Van Le Kaiqiang Zhang Ho Won Jang Mohammadreza Shokouhimehr 《RSC advances》2020,10(62):37834
Scientists have categorized conductive polymers as materials having strongly reversible redox behavior and uncommon combined features of plastics and metal. Because of their multifunctional characteristics, e.g., simplistic synthesis, acceptable environmental stability, beneficial optical, electronic, and mechanical features, researchers have largely considered them for diverse applications. Therefore, their capability of catalyzing several electrode reactions has been introduced as one of their significant features. A thin layer of the conducting polymer deposited on the substrate electrode surface can augment the electrode process kinetics of several solution species. Such electrocatalytic procedures with modified conducting polymer electrodes can create beneficial utilization in diverse fields of applied electrochemistry. This review article explores typical recent applications of conductive polymers (2016–2020) as active electrode materials for energy storage applications, electrochemical sensing, and conversion fields such as electrochemical supercapacitors, lithium-ion batteries, fuel cells, and solar cells.Scientists have categorized conductive polymers as materials having strongly reversible redox behavior and uncommon combined features of plastics and metal. 相似文献
32.
Mohammadreza Sedghipour Ali Mahdavifar Rohollah Fadaei Fouladi Davoud Gharabaghi Mohammadbagher Rahbani Ghasem Amiraslanzadeh Mohammadreza Afhami 《国际眼科杂志》2012,12(3):389-392
AIM: To investigate the effect of hyaluronidase use on the quality of sub-Tenon's anaesthesia for phacoemulsification.
METHODS: This was a randomized, double-blind clinical trial which was conducted at Nikookari Eye Hospital for 5 months. Forty-two eyes of candidates for phacoemulsification under sub-Tenon's anaesthesia were randomly allocated to two equal groups and received either 2 mL of lidocaine 2% solution with (LH), or without (L) addition of hyaluronidase (150IU/mL). Akinesia was assessed 15 minutes after sub-Tenon’s injection. Patients and surgeon’s satisfaction, as well as the postoperative pain (the visual analogue scale, VAS) were investigated after operation. The contingency tables (including the Chi-square or Fisher's exact tests, when appropriate) and parametric analysis (the independent samples t test) were used for statistical analysis.
RESULTS: Complete akinesia (33.3% vs 4.8%, P=0.04), as well as the patients (85.7% vs 57.1%, P=0.04) and surgeon’s satisfaction (87.5% vs 52.4%, P=0.02) were significantly more frequent in LH than in L group. The mean VAS was significantly lower in the same group (1.90±1.45 vs 3.00±1.55, P=0.04).
CONCLUSION: Addition of hyaluronidase to lidocaine solution for sub-Tenon's anesthesia significantly improves the ocular akinesia, enhances the intra-operative patients and surgeons' satisfaction, and attenuates the postoperative pain. 相似文献
33.
Risk factors for clinically significant macular edema in a multi-ethnics population with type 2 diabetes 下载免费PDF全文
AIM: To determine the risk factors of clinically significant macular edema (CSME) in patients with non-proliferative diabetic retinopathy (NPDR) in a multi-ethnics Malaysian population.
METHODS: We performed a case control study in which 150 patients with bilateral NPDR and CSME in either eye were compared to 150 patients with bilateral NPDR and no CSME in both eyes. CSME and NPDR were graded according to Early Treatment of Diabetic Retinopathy Study criteria. Student’s t-test, odds ratio and multiple logistic regression analysis were performed to analyze the duration of diabetes, body mass index (BMI), blood pressure(BP), total cholesterol, low density lipoprotein (LDL), high density lipoprotein (HDL), triglycerides (TG), fasting blood glucose (FBG), HbA1c, full blood count, serum creatinine and proteinuria between the two groups.
RESULTS: Both groups were matched in terms of age, gender and ethnicity. Duration of diabetes, total serum cholesterol, serum LDL, FBG, HbA1c and serum creatinine were significantly higher in the CSME group (P<0.05). The hemoglobin, packed cell volume were significantly lower in the CSME group (p<0.05). There was no significant difference for serum HDL, TG, BMI, systolic and diastolic BP. Multiple logistic regression analysis showed that total serum cholesterol and HbA1c had significantly high odds of developing CSME.
CONCLUSION: HbA1c and total cholesterol are the two most important risk factors associated with CSME in patients with NPDR. 相似文献
34.
35.
36.
37.
Farahnaz Fahimipour Erfan Dashtimoghadam Morteza Rasoulianboroujeni Mostafa Yazdimamaghani Kimia Khoshroo Mohammadreza Tahriri Amir Yadegari Jose A. Gonzalez Daryoosh Vashaee Douglas C. Lobner Tahereh S. Jafarzadeh Kashi Lobat Tayebi 《Dental materials》2018,34(2):209-220
Objective
A systematic characterization of hybrid scaffolds, fabricated based on combinatorial additive manufacturing technique and freeze-drying method, is presented as a new platform for osteoblastic differentiation of dental pulp cells (DPCs).Methods
The scaffolds were consisted of a collagenous matrix embedded in a 3D-printed beta-tricalcium phosphate (β-TCP) as the mineral phase. The developed construct design was intended to achieve mechanical robustness owing to 3D-printed β-TCP scaffold, and biologically active 3D cell culture matrix pertaining to the Collagen extracellular matrix. The β-TCP precursor formulations were investigated for their flow-ability at various temperatures, which optimized for fabrication of 3D printed scaffolds with interconnected porosity. The hybrid constructs were characterized by 3D laser scanning microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and compressive strength testing.Results
The in vitro characterization of scaffolds revealed that the hybrid β-TCP/Collagen constructs offer superior DPCs proliferation and alkaline phosphatase (ALP) activity compared to the 3D-printed β-TCP scaffold over three weeks. Moreover, it was found that the incorporation of TCP into the Collagen matrix improves the ALP activity.Significance
The presented results converge to suggest the developed 3D-printed β-TCP/Collagen hybrid constructs as a new platform for osteoblastic differentiation of DPCs for craniomaxillofacial bone regeneration. 相似文献38.
39.
Ali Akbar Motedayen Mohammadreza Rezaeigolestani Carole Guillaume Valrie Guillard Nathalie Gontard 《RSC advances》2019,9(19):10938
The gas (O2 and CO2) permeability of an innovative stratified PE–organoclay (LLDPE/OMMT) nano-enabled composite films was studied for the first time and related to the self-assembly process driven by hydrophobic interactions. An 84.4% and a 70% reduction (i.e. a barrier improvement factor of about 6, sufficient for food packaging applications) were observed respectively in the oxygen and carbon dioxide permeability of the 5 bilayers coated film compared to the substrate, while only incorporating 2.4 v/v% of organoclay in the composite and increasing the thickness by 17.7%. Such drastic effect with so low amount of organoclays cannot be achieved by conventional melt blending/exfoliation of the clays into the polymer matrix and is due to a geometrical blocking effect of a brick-wall and compact layer structure of the impermeable clay tactoids. Mathematical prediction of oxygen barrier performance of PE/OMMT films has revealed that 12 bilayers would be necessary to further achieve a barrier improvement factor of 10.The gas (O2 and CO2) permeability of an innovative stratified PE–organoclay (LLDPE/OMMT) nano-enabled composite films was studied for the first time and related to the self-assembly process driven by hydrophobic interactions. 相似文献
40.
Shahin Amani Amir Bagheri Garmarudi Niloofar Rahmani Mohammadreza Khanmohammadi 《RSC advances》2019,9(55):32348
Herein, the nanosized ZSM-5 zeolite was synthesized based on a fractional factorial experimental design by a hydrothermal method to study the optimum conditions for the synthesis and formation of the ZSM-5 zeolite by employing different conditions. The samples were synthesized without any organic template, and different conditions, such as the molar composition of the synthesis gel and reaction time, were applied in a wide range. Then, the samples were analysed by X-ray diffraction to investigate the formation of the zeolite ZSM-5, and the results were compared to obtain the optimum conditions for its synthesis. The obtained samples were characterized by SEM, FTIR spectroscopy and TGA. Then, the functionalization of nano zeolite ZSM-5 crystals with β-cyclodextrin (β-CD) was investigated. The zeolite surface was first functionalized with amino groups using an amino alkoxysilane. Then, toluene diisocyanate was reacted with the amino-terminated ZSM-5 zeolite crystals and used for the incorporation of β-CD via its remaining isocyanate groups. After this, a drug delivery system (DDS) was prepared based on the cyclodextrin-modified zeolite with the curcumin anticancer drug, and its formation was studied under experimental conditions. The results of in vitro studies show that this drug delivery system has better characteristics than free curcumin in terms of stability and anti-proliferative and anti-inflammatory effects.Herein, the nanosized ZSM-5 zeolite was synthesized based on a fractional factorial experimental design by a hydrothermal method to study the optimum conditions for the synthesis and formation of the ZSM-5 zeolite by employing different conditions. 相似文献