全文获取类型
收费全文 | 4847篇 |
免费 | 295篇 |
国内免费 | 70篇 |
专业分类
耳鼻咽喉 | 72篇 |
儿科学 | 62篇 |
妇产科学 | 124篇 |
基础医学 | 761篇 |
口腔科学 | 226篇 |
临床医学 | 512篇 |
内科学 | 991篇 |
皮肤病学 | 72篇 |
神经病学 | 318篇 |
特种医学 | 380篇 |
外科学 | 533篇 |
综合类 | 121篇 |
一般理论 | 1篇 |
预防医学 | 282篇 |
眼科学 | 48篇 |
药学 | 340篇 |
中国医学 | 54篇 |
肿瘤学 | 315篇 |
出版年
2023年 | 25篇 |
2022年 | 89篇 |
2021年 | 159篇 |
2020年 | 74篇 |
2019年 | 107篇 |
2018年 | 136篇 |
2017年 | 102篇 |
2016年 | 150篇 |
2015年 | 190篇 |
2014年 | 226篇 |
2013年 | 274篇 |
2012年 | 429篇 |
2011年 | 366篇 |
2010年 | 208篇 |
2009年 | 185篇 |
2008年 | 250篇 |
2007年 | 277篇 |
2006年 | 243篇 |
2005年 | 207篇 |
2004年 | 150篇 |
2003年 | 153篇 |
2002年 | 152篇 |
2001年 | 111篇 |
2000年 | 128篇 |
1999年 | 69篇 |
1998年 | 48篇 |
1997年 | 57篇 |
1996年 | 51篇 |
1995年 | 27篇 |
1994年 | 29篇 |
1993年 | 27篇 |
1992年 | 31篇 |
1991年 | 37篇 |
1990年 | 30篇 |
1989年 | 41篇 |
1988年 | 41篇 |
1987年 | 45篇 |
1986年 | 46篇 |
1985年 | 21篇 |
1984年 | 20篇 |
1983年 | 30篇 |
1982年 | 15篇 |
1981年 | 21篇 |
1980年 | 14篇 |
1979年 | 12篇 |
1978年 | 17篇 |
1977年 | 8篇 |
1976年 | 9篇 |
1974年 | 13篇 |
1972年 | 14篇 |
排序方式: 共有5212条查询结果,搜索用时 15 毫秒
61.
62.
63.
Serial Evaluation of Endometrial Blood Flow for Prediction of Pregnancy Outcomes in Patients Who Underwent Controlled Ovarian Hyperstimulation and In Vitro Fertilization and Embryo Transfer 下载免费PDF全文
64.
65.
Near-infrared (NIR) photoswitching transistors have been fabricated using a hybrid structure of zinc oxide (ZnO) and quantum-dots (QDs). The ZnO active layer was prepared using a solution process, while colloidal QDs were inserted between a silicon dioxide (SiO2) gate insulator and a ZnO active layer. The small band gap QDs (1.59 eV) were used to absorb low-energy NIR photons, generate photo-excited carriers, and inject them into the conduction band of the ZnO film. The device with the interfacial QDs induced photocurrents upon exposure to 780 nm-wavelength light. The photoresponsivity of the ZnO/QD device was 0.06 mA W−1, while that of the device without QDs was 1.7 × 10−5 mA W−1, which indicated that the small band gap QDs enabled a photo-induced current when exposed to NIR light. Furthermore, a photoinverter was prepared which was composed of a ZnO/QDs phototransistor and a load resistor. Photoswitching characteristics indicated that the photoinverter was well modulated by a periodic light signal of 780 nm in wavelength. The results demonstrate a useful way to fabricate NIR optoelectronics based on ZnO and QDs.A near-infrared photoinverter was fabricated based on ZnO and quantum-dots. We found that the small band gap quantum-dots could absorb low-energy near-infrared photons, generate photo-excited carriers, and inject them into the conduction band of ZnO. 相似文献
66.
67.
Behçets disease (BD) is a connective tissue disorder characterized by recurrent orogenital ulcer, uveitis, and skin lesions. Recurrent aphthous ulcer is associated with human cytomegalovirus (HCMV). To investigate the possible role of HCMV in BD, we measured the titers of IgG, IgM, and IgA anti-HCMV antibodies in 73 Korean patients with BD, 50 with scleroderma, 70 with systemic lupus erythematosus, and 50 from healthy controls by indirect immunofluorescent staining. The titer of IgG anti-HCMV antibody was significantly lower in patients with BD than in controls (geometric mean 3115.4 vs 9687.6, P=0.0001 by Wilcoxons rank sum test), as was the titer of IgA anti-HCMV antibody (geometric mean 1.9 vs 15.7, P=0.0001, Wilcoxons rank sum test). In conclusion, we found significantly lower antibody responses to HCMV in patients with BD. 相似文献
68.
69.
Lesions caused by verrucus vulgaris are commonly refractory to therapy and may become large, painful, or disfiguring in immunocompromised patients. Cidofovir is a potent nucleoside analog antiviral agent shown to have in vitro and in vivo activity against a broad spectrum of DNA viruses. We report a successful use of topical cidofovir to treat verruca vulgaris lesions in a highly immunocompromised patient, who was not considered a candidate for conventional therapy. 相似文献
70.
Limitation of the validity of the homeostasis model assessment as an index of insulin resistance in Korea 总被引:3,自引:0,他引:3
Kang ES Yun YS Park SW Kim HJ Ahn CW Song YD Cha BS Lim SK Kim KR Lee HC 《Metabolism: clinical and experimental》2005,54(2):206-211
Homeostasis model assessment of insulin resistance (HOMA-IR) is a less invasive, inexpensive, and less labor-intensive method to measure insulin resistance (IR) as compared with the glucose clamp test. The aim of this study was to evaluate the validity of HOMA-IR by comparing it with the euglycemic clamp test in determining IR. We assessed the validity of HOMA-IR by comparing it with the total glucose disposal rate measured by the 3-hour euglycemic-hyperinsulinemic clamp in subjects with type 2 diabetes (n = 47), impaired glucose tolerance (n = 21), and normal glucose tolerance (n = 22). There was a strong inverse correlation (r = -0.558; P < .001) between the log-transformed HOMA-IR and the total glucose disposal rate. There was moderate agreement between the 2 methods in the categorization according to the IR (weighted kappa = 0.294). The magnitude of the correlation coefficients was smaller in the subjects with a lower body mass index (BMI <25.0 kg/m2 , r = -0.441 vs BMI > or =25.0 kg/m2 , r = -0.615; P = .032), a lower HOMA-beta cell function (HOMA- beta <60.0, r = -0.527 vs HOMA- beta > or =60.0, r = -0.686; P = .016), and higher fasting glucose levels (fasting glucose < or =5.66 mmol/L, r = -0.556 vs fasting glucose >5.66 mmol/L, r = -0.520; P = .039). The limitation of the validity of the HOMA-IR should be carefully considered in subjects with a lower BMI, a lower beta cell function, and high fasting glucose levels such as lean type 2 diabetes mellitus with insulin secretory defects. 相似文献