全文获取类型
收费全文 | 3918篇 |
免费 | 258篇 |
国内免费 | 17篇 |
专业分类
耳鼻咽喉 | 30篇 |
儿科学 | 149篇 |
妇产科学 | 145篇 |
基础医学 | 460篇 |
口腔科学 | 63篇 |
临床医学 | 490篇 |
内科学 | 974篇 |
皮肤病学 | 71篇 |
神经病学 | 124篇 |
特种医学 | 183篇 |
外科学 | 210篇 |
综合类 | 153篇 |
现状与发展 | 1篇 |
预防医学 | 451篇 |
眼科学 | 53篇 |
药学 | 358篇 |
1篇 | |
中国医学 | 103篇 |
肿瘤学 | 174篇 |
出版年
2023年 | 45篇 |
2022年 | 143篇 |
2021年 | 206篇 |
2020年 | 102篇 |
2019年 | 107篇 |
2018年 | 98篇 |
2017年 | 74篇 |
2016年 | 92篇 |
2015年 | 107篇 |
2014年 | 116篇 |
2013年 | 150篇 |
2012年 | 223篇 |
2011年 | 186篇 |
2010年 | 146篇 |
2009年 | 119篇 |
2008年 | 187篇 |
2007年 | 174篇 |
2006年 | 132篇 |
2005年 | 138篇 |
2004年 | 99篇 |
2003年 | 108篇 |
2002年 | 76篇 |
2001年 | 53篇 |
2000年 | 40篇 |
1999年 | 43篇 |
1998年 | 56篇 |
1997年 | 62篇 |
1996年 | 55篇 |
1995年 | 47篇 |
1994年 | 59篇 |
1993年 | 43篇 |
1992年 | 33篇 |
1991年 | 28篇 |
1990年 | 27篇 |
1989年 | 39篇 |
1988年 | 46篇 |
1987年 | 38篇 |
1986年 | 33篇 |
1985年 | 29篇 |
1984年 | 23篇 |
1983年 | 22篇 |
1982年 | 19篇 |
1981年 | 26篇 |
1980年 | 18篇 |
1959年 | 35篇 |
1958年 | 58篇 |
1957年 | 87篇 |
1956年 | 45篇 |
1955年 | 75篇 |
1954年 | 67篇 |
排序方式: 共有4193条查询结果,搜索用时 15 毫秒
121.
Hoang Huong Thi Xuan Molassiotis Alex Chan Choi Wan Nguyen Thi Huong Liep Nguyen Van 《Sleep & breathing》2020,24(1):241-251
Sleep and Breathing - Although insomnia is common among cancer patients, its prevalence remains variable, and its risk factors and correlation with other cancer-related symptoms are not fully... 相似文献
122.
Geri G Wechsler B Thi Huong du L Isnard R Piette JC Amoura Z Resche-Rigon M Cacoub P Saadoun D 《Medicine》2012,91(1):25-34
Cardiac abnormalities in patients with Beh?et disease (BD) include pericarditis, myocarditis, endocarditis with valvular regurgitation, intracardiac thrombosis, endomyocardial fibrosis, coronary arteritis with or without myocardial infarction, and aneurysms of the coronary arteries or sinus of Valsalva. Data regarding the clinical spectrum, prevalence, and outcome of cardiac lesions in BD are lacking. In this study, we report the main characteristics, treatment, and long-term outcomes of 52 patients with cardiac lesions from a cohort of 807 (6%) BD patients. Forty-five (86.5%) patients were male, with a mean (±SD) age at BD diagnosis of 29.3 ± 10.3 years.Cardiac involvement was the first feature of BD in 17 (32.7%) patients. Cardiac lesions included pericarditis (n = 20; 38.5%), endocarditis (mostly aortic insufficiency) (n = 14; 26.9%), intracardiac thrombosis (n = 10; 19.2%), myocardial infarction (n = 9; 17.3%), endomyocardial fibrosis (n = 4; 7.7%) and myocardial aneurysm (n = 1; 1.9%). Patients with cardiac involvement were more frequently male (86.5% vs. 64.9%; p < 0.01) and had more arterial (42.3% vs. 11.1%; p < 0.01) and venous lesions (59.6% vs. 35.8%; p < 0.01) compared to those without cardiac manifestations. Factors associated with complete remission of cardiac involvement were treatment regimens with oral anticoagulants, immunosuppressants, and colchicine. The 5-year survival rate was 83.6% and 95.8% (p = 0.03) in BD patients with and without cardiac involvement, respectively. After a median (Q1-Q3) follow-up of 3.0 (1.75-4.2) years, 8 patients had died, in 3 cases directly related to cardiac involvement.In conclusion, cardiac lesions affected 6% of our large cohort of BD patients. The prognosis of cardiac involvement in BD is poor and improves with oral anticoagulation, immunosuppressive therapy, and colchicine. 相似文献
123.
124.
There is an evidence of abnormal metabolism in the vitamin D endocrine system of patients with leprosy. Bone deformities usually occur in patients with leprosy. Genetic factors, such as the vitamin D receptor, the major histocompatibility complex region, chromosome 20, human toll-like receptors, the natural resistance-associated macrophage protein 1, the nucleotide-binding oligomerization domain containing 2, phosphate-regulating gene with homologies to endopeptidase on the X chromosome and the tyrosine kinase growth factor receptor-ErbB-2, contribute to both vitamin D status and leprosy. The role of vitamin D in leprosy has been demonstrated by its effects on Bacillus Calmette-Guérin vaccination, vascular endothelial growth factor, prostaglandins, reactive oxygen species, reactive nitrogen intermediates, matrix metalloproteinases, antiphospholipid syndrome and the nerve growth factor. Vitamin D plays a definite role in leprosy. Vitamin D, itself, may effect on leprosy through the vitamin D receptors or may influence leprosy through indirect effects. 相似文献
125.
126.
127.
128.
129.
130.
Nguyen Tat Thang Le Thi Hong Nguyen Hoang Thoan Chu Manh Hung Nguyen Van Duy Nguyen Van Hieu Nguyen Duc Hoa 《RSC advances》2020,10(22):12759
Fabrication of a high-performance room-temperature (RT) gas sensor is important for the future integration of sensors into smart, portable and Internet-of-Things (IoT)-based devices. Herein, we developed a NO2 gas sensor based on ultrathin MoS2 nanoflowers with high sensitivity at RT. The MoS2 flower-like nanostructures were synthesised via a simple hydrothermal method with different growth times of 24, 36, 48, and 60 h. The synthesised MoS2 nanoflowers were subsequently characterised by scanning electron microscopy, X-ray diffraction, Raman spectroscopy, energy-dispersive X-ray spectroscopy and transmission electron microscopy. The petal-like nanosheets in pure MoS2 agglomerated to form a flower-like structure with Raman vibrational modes at 378 and 403 cm−1 and crystallisation in the hexagonal phase. The specific surface areas of the MoS2 grown at different times were measured by using the Brunauer–Emmett–Teller method. The largest specific surface area of 56.57 m2 g−1 was obtained for the MoS2 nanoflowers grown for 48 h. This sample also possessed the smallest activation energy of 0.08 eV. The gas-sensing characteristics of sensors based on the synthesised MoS2 nanostructures were investigated using oxidising and reducing gases, such as NO2, SO2, H2, CH4, CO and NH3, at different concentrations and at working temperatures ranging from RT to 150 °C. The sensor based on the MoS2 nanoflowers grown for 48 h showed a high gas response of 67.4% and high selectivity to 10 ppm NO2 at RT. This finding can be ascribed to the synergistic effects of largest specific surface area, smallest crystallite size and lowest activation energy of the MoS2-48 h sample among the samples. The sensors also exhibited a relative humidity-independent sensing characteristic at RT and a low detection limit of 84 ppb, thereby allowing their practical application to portable IoT-based devices.Controlled synthesis of ultrathin MoS2 nanoflowers is crucial to develop a high-performance room-temperature NO2 gas sensor for the future integration of sensors into smart, portable and Internet-of-Things (IoT)-based devices. 相似文献