全文获取类型
收费全文 | 1890篇 |
免费 | 102篇 |
国内免费 | 14篇 |
专业分类
耳鼻咽喉 | 7篇 |
儿科学 | 35篇 |
妇产科学 | 50篇 |
基础医学 | 207篇 |
口腔科学 | 41篇 |
临床医学 | 141篇 |
内科学 | 439篇 |
皮肤病学 | 58篇 |
神经病学 | 97篇 |
特种医学 | 28篇 |
外科学 | 341篇 |
综合类 | 50篇 |
预防医学 | 192篇 |
眼科学 | 37篇 |
药学 | 181篇 |
中国医学 | 6篇 |
肿瘤学 | 96篇 |
出版年
2023年 | 27篇 |
2022年 | 49篇 |
2021年 | 114篇 |
2020年 | 62篇 |
2019年 | 77篇 |
2018年 | 88篇 |
2017年 | 64篇 |
2016年 | 57篇 |
2015年 | 53篇 |
2014年 | 91篇 |
2013年 | 86篇 |
2012年 | 138篇 |
2011年 | 145篇 |
2010年 | 111篇 |
2009年 | 67篇 |
2008年 | 70篇 |
2007年 | 100篇 |
2006年 | 73篇 |
2005年 | 96篇 |
2004年 | 76篇 |
2003年 | 69篇 |
2002年 | 39篇 |
2001年 | 26篇 |
2000年 | 13篇 |
1999年 | 16篇 |
1998年 | 5篇 |
1997年 | 11篇 |
1996年 | 4篇 |
1994年 | 6篇 |
1993年 | 3篇 |
1992年 | 8篇 |
1991年 | 18篇 |
1990年 | 7篇 |
1989年 | 9篇 |
1988年 | 10篇 |
1987年 | 7篇 |
1986年 | 13篇 |
1985年 | 6篇 |
1983年 | 4篇 |
1979年 | 3篇 |
1977年 | 8篇 |
1974年 | 4篇 |
1973年 | 12篇 |
1972年 | 16篇 |
1971年 | 10篇 |
1970年 | 3篇 |
1969年 | 5篇 |
1968年 | 5篇 |
1967年 | 6篇 |
1966年 | 3篇 |
排序方式: 共有2006条查询结果,搜索用时 0 毫秒
11.
12.
Abdallah MA Abdullah HI Kang S Taylor DD Nakajima ST Gercel-Taylor C 《Fertility and sterility》2007,87(4):978-981
We describe our experience of over 300 cycles of preimplantation genetic diagnosis (PGD) and report clinical pregnancy rates (35%-67%) that support using this technology to screen for genetic disorders and chromosomal abnormalities. In clinical practice for over ten years, PGD offers couples the earliest form of genetic screening and may help improve ongoing pregnancy rates in poor-prognosis patients. 相似文献
13.
M. Abdallah M. A. Hegazy H. Ahmed Arej S. Al-Gorair H. Hawsawi M. Morad F. Benhiba I. Warad A. Zarrouk 《RSC advances》2022,12(27):17050
New cationic Gemini surfactant (CGS) molecules were synthesized and investigated as anticorrosive materials for carbon steel (CS) in 1 M HCl solution by chemical, electrochemical and theoretical studies such as DFT and MDS approaches. The anticorrosion efficacy increased with the increase in the CGS concentration. It reached 95.66% at 5 × 10−3 M of the CGS molecule using PDP measurements. PDP studies confirm that the CGS molecule acts as a mixed inhibitor. The EIS outcomes were explained by an equivalent circuit in which a constant phase element (CPE) rather than a double-layer capacitance (Cdl) was exploited to donate a more precise fit of the experimental outcomes. The CGS molecule follows the Langmuir isotherm as it is chemically adsorbed onto the surface of CS. To explore the kinetic and adsorption mechanisms, the thermodynamic characteristics of the activation and adsorption processes were assessed under the impact of temperature. Frontier molecular orbitals (FMOs) were achieved by the density functional theory (DFT) method. The study of interatomic interactions at the [CS (Fe(110))]/CGS level was discussed using molecular dynamics (MD) simulation.New cationic Gemini surfactant (CGS) molecules were synthesized and investigated as anticorrosive materials for carbon steel (CS) in 1 M HCl solution by chemical, electrochemical and theoretical studies such as DFT and MDS approaches. 相似文献
14.
15.
Mamdooh Ghoneum Heba Allah M. Elbaghdady Abdallah A. El-Shebly Deyu Pan Edward Assanah Greg Lawson 《Journal of radiation research》2013,54(5):852-862
Hydroferrate fluid, MRN-100, an iron-based compound derived from bivalent and trivalent ferrates, is a potent antioxidant compound. Therefore, we examined the protective effect of MRN-100 against γ-radiation-induced lethality and damage to hematopoietic tissues in fish. A total of 216 Nile tilapia fish (Oreochromis niloticus) were randomly divided into four groups. Group 1 served as a control that was administered no radiation and no MRN-100 treatment. Group 2 was exposed only to γ-radiation (15 Gy). Groups 3 and 4 were pre-treated with MRN-100 at doses of either 1 ml/l or 3 ml/l in water for 1 week, and subsequently exposed to radiation while continuing to receive MRN-100 for 27 days. The survival rate was measured, and biochemical and histopathological analyses of hematopoietic tissues were performed for the different treatment groups at 1 and 4 weeks post-radiation. Exposure to radiation reduced the survival rate to 27.7%, while treatment with MRN-100 maintained the survival rate at 87.2%. In addition, fish exposed to γ-radiation for 1 week showed a significant decrease in the total number of white blood cells (WBCs) and red blood cells (RBCs) series. However, treatment with MRN-100 protected the total WBC count and the RBCs series when compared with irradiated fish. Furthermore, significant histological lesions were observed in the hepatopancreas, spleen and gills of irradiated fish. However, treatment with MRN-100 protected the histopathology of various organs. We conclude that MRN-100 is a radioprotective agent in fish and may be useful as an adjuvant treatment to counteract the adverse side effects associated with radiation exposure. 相似文献
16.
17.
ObjectiveThe prognostic value of MAC severity is important not only because it shares a common risk factors with vascular atherosclerotic changes but also through increasing the cardiovascular morbidity and mortality. This study was conducted in order to evaluate association between severity of MAC and left sided echocardiographic abnormalities mainly left sided valvular abnormalities as well as left atrial systolic and diastolic functional abnormalities.MethodsWe prospectively obtained 12-leads electrocardiograms and transthoracic echocardiograms (TTE) on patients scheduled for non-emergent echocardiographic assessment at tertiary care hospital. MAC was graded as mild, moderate and severe. LA linear dimensions, LA filling and emptying volumes and left atrium ejection fraction were done specifically in addition to commonly measured TTE parameters.ResultsFrom the 80 patients considered for the study, 47 patients had mild MAC, 29 patients had moderate MAC and 4 patients had severe MAC. Valvular affection through echo-doppler assessment that included mainly mitral stenosis, mitral incompetence, aortic sclerosis as well as aortic incompetence showed a highly significant statistical difference (p-values 0.00, 0.00, 0.00 and 0.00 respectively). There was a highly significant statistical difference between patients with different degrees of MAC and LA linear dimension (p-value 0.00), all LA filling and emptying volumes as well as LA ejection fractions with the exception of LA passive emptying volume and LA passive ejection fraction was insignificant.ConclusionsThere is a direct proportionate relationship between severity of MAC and associated left sided valvular affection, increase LA linear dimension as well as lower overall LA function. 相似文献
18.
19.
Abdallah El Sabbagh Mackram F. Eleid Mohammed Al-Hijji Nandan S. Anavekar David R. Holmes Vuyisile T. Nkomo Gustavo S. Oderich Stephen D. Cassivi Sameh M. Said Charanjit S. Rihal Jane M. Matsumoto Thomas A. Foley 《Current cardiology reports》2018,20(6):47
Purpose of Review
To highlight the various applications of 3D printing in cardiovascular disease and discuss its limitations and future direction.Recent Findings
Use of handheld 3D printed models of cardiovascular structures has emerged as a facile modality in procedural and surgical planning as well as education and communication.Summary
Three-dimensional (3D) printing is a novel imaging modality which involves creating patient-specific models of cardiovascular structures. As percutaneous and surgical therapies evolve, spatial recognition of complex cardiovascular anatomic relationships by cardiologists and cardiovascular surgeons is imperative. Handheld 3D printed models of cardiovascular structures provide a facile and intuitive road map for procedural and surgical planning, complementing conventional imaging modalities. Moreover, 3D printed models are efficacious educational and communication tools. This review highlights the various applications of 3D printing in cardiovascular diseases and discusses its limitations and future directions.20.
Rima Moghnieh Dania Abdallah Lyn Awad Tamima Jisr Anas Mugharbil Ali Youssef Hani Tamim Samer Khaldieh Oula Massri Najat Rashini Youssef Hamdan Ahmad Ibrahim 《Infection》2018,46(6):823-835