全文获取类型
收费全文 | 45777篇 |
免费 | 2715篇 |
国内免费 | 66篇 |
专业分类
耳鼻咽喉 | 737篇 |
儿科学 | 2073篇 |
妇产科学 | 1142篇 |
基础医学 | 5312篇 |
口腔科学 | 2278篇 |
临床医学 | 4042篇 |
内科学 | 9465篇 |
皮肤病学 | 1279篇 |
神经病学 | 3700篇 |
特种医学 | 1419篇 |
外国民族医学 | 1篇 |
外科学 | 7284篇 |
综合类 | 237篇 |
一般理论 | 21篇 |
预防医学 | 2888篇 |
眼科学 | 1177篇 |
药学 | 2926篇 |
中国医学 | 182篇 |
肿瘤学 | 2395篇 |
出版年
2024年 | 51篇 |
2023年 | 431篇 |
2022年 | 322篇 |
2021年 | 936篇 |
2020年 | 609篇 |
2019年 | 950篇 |
2018年 | 1604篇 |
2017年 | 1141篇 |
2016年 | 1232篇 |
2015年 | 1088篇 |
2014年 | 1264篇 |
2013年 | 2108篇 |
2012年 | 3242篇 |
2011年 | 3861篇 |
2010年 | 1784篇 |
2009年 | 1052篇 |
2008年 | 3174篇 |
2007年 | 3407篇 |
2006年 | 3308篇 |
2005年 | 3300篇 |
2004年 | 3103篇 |
2003年 | 2885篇 |
2002年 | 2724篇 |
2001年 | 883篇 |
2000年 | 998篇 |
1999年 | 595篇 |
1998年 | 279篇 |
1997年 | 254篇 |
1996年 | 206篇 |
1995年 | 172篇 |
1994年 | 172篇 |
1993年 | 137篇 |
1992年 | 108篇 |
1991年 | 89篇 |
1990年 | 96篇 |
1989年 | 82篇 |
1988年 | 75篇 |
1987年 | 60篇 |
1986年 | 61篇 |
1985年 | 59篇 |
1984年 | 68篇 |
1983年 | 52篇 |
1982年 | 64篇 |
1981年 | 56篇 |
1980年 | 56篇 |
1979年 | 42篇 |
1978年 | 39篇 |
1977年 | 51篇 |
1976年 | 29篇 |
1973年 | 24篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
Güner Yildiz Yasin Ceylan Oktay Ucer Deniz Arslan Orçun Çelik Bülent Gunlusoy 《International urogynecology journal》2016,27(11):1667-1671
Introduction and hypothesis
The purpose of this study was to investigate the success and complication rates of single-incision sling for treating stress urinary incontinence (SUI), with a 3-year follow-up.Methods
This study comprised 173 female patients with SUI or mixed urinary incontinence (MUI) with dominant SUI who underwent minisling procedure. All patients had positive cough stress test preoperatively; they were followed up for 3 years after surgery (1, 3, 6, 12 months, and yearly).Results
Total follow-up was 36 months, and mean age 51 years (44–77); 128 (74 %) patients presented SUI and 45 (26 %) MUI. Objective and subjective cure and failure rates were 83.8 % (145 cases), 6.4 % (11 cases), and 9.8 % (17 cases), respectively. There were no differences in cure rates between 1 and 3 years. Mean body mass index was 28.7 (26.1–35.2), and mean operating time 7.9 min. (6.5–11.9). There were no major intraoperative complications. Eleven patients (6.4 %) had de novo urge incontinence that resolved using anticholinergic drugs; no patient had urinary retention. Vaginal mesh extrusion was reported in nine (5.2 %) patients.Conclusions
The minisling system attained high success rates at 3 years’ follow-up. The procedure was easy to learn and has lower complication rate.992.
Luana Marotta Reis de Vasconcellos Mary Anne Moreira Barbara Emanuel da Silva Rovai Mariana de Oliveira França Zahra Fernandes Ebrahim Luis Gustavo Oliveira de Vasconcellos Camila Deco Porto Carlos Alberto Alves Cairo 《Lasers in medical science》2016,31(5):899-905
The present study aimed to assess the effects of low-level laser therapy (GaAlAs) on the bone repair process within titanium scaffolds in the femurs of healthy and osteoporotic rats. Fifty-six rats were divided into four groups: group Sh: SHAM animals that received scaffolds; group LSh: SHAM animals that received scaffolds and were subjected to laser therapy; group OV: ovarietomized (OVX) animals that received scaffolds; and group LOV: OVX animals that received scaffolds and were subjected to laser therapy. Thirty days following ovariectomy or sham surgery, scaffolds were implanted in the left femurs of all animals in the study. Immediately after opening the surgical site, the inner part of the surgical cavity was stimulated with low-level laser (GaAlAs). In addition to this procedure, the laser group was also subjected to sessions of low-level laser therapy (LLLT) at 48-h intervals, with the first session performed immediately after surgery. The rats were sacrificed at 2 and 6 weeks, time in which femur fragments were submitted for histological and histomorphometric examination, and skin tissue above the scaffold was submitted to histological analysis. At the end of the study, greater bone formation was observed in the animals submitted to LLLT. At 2 and 6 weeks, statistically significant differences were observed between LSh and Sh groups (p?=?0.009 and 0.0001) and LOV and OV (p?=?0.0001 and 0.0001), respectively. No statistical difference was observed when assessing the estrogen variable. On the basis of our methodology and results, we conclude that LLLT improves and accelerates bone repair within titanium scaffolds in both ovariectomized and healthy rats, when compared to animals not subjected to radiation. 相似文献
993.
Z. A. Güçlü N. Dönmez T. Tüzüner M. E. Odabaş A. P. Hurt N. J. Coleman 《Lasers in medical science》2016,31(4):705-711
UltraSeal XT® hydro? is a new hydrophilic, light-cured, methacrylate-based pit and fissure sealant which has been developed by Ultradent Products, USA. The sealant is highly filled with a 53 wt.% mixture of inorganic particles which confer both thixotropy and radiopacity. The principal purpose of this study was to investigate the microleakage of UltraSeal XT® hydro? as a function of different enamel etching techniques. The occlusal surfaces of sound, extracted human molars were either acid etched, Er:YAG laser irradiated or successively laser irradiated and acid etched. UltraSeal XT® hydro? was applied to each group of teeth (n?=?10) which were subjected to a thermocycling process consisting of 2500 cycles between 5 and 50 °C with a dwell time of 30 s. Microleakage assessments were then carried out using 0.5 % fuchsin dye and optical microscopy. The microleakage score data were analysed using the Kruskal-Wallis, Mann–Whitney U test with Bonferroni adjustment. No significant differences in microleakage were noted between the individually acid etched and laser-irradiated groups (p?>?0.05); however, teeth treated with a combination of laser irradiation and acid etching demonstrated significantly lower microleakage scores (p?<?0.001). Electron microscopy with energy-dispersive X-ray analysis revealed that the mineral filler component of UltraSeal XT® hydro? essentially comprises micrometre-sized particles of inorganic silicon-, aluminium- and barium-bearing phases. Laser etching increases the roughness of the enamel surface which causes a concentrated zoning of the filler particles at the enamel-sealant interface. 相似文献
994.
Synthesis of dental matrix proteins and viability of odontoblast-like cells irradiated with blue LED
Juliana Rosa Luiz Alonso Ana Paula Silveira Turrioni Fernanda Gonçalves Basso Carlos Alberto de Souza Costa Josimeri Hebling 《Lasers in medical science》2016,31(3):523-530
To evaluate the effect of irradiation with light-emitting diode (LED; 455 nm) on the viability and synthesis of dentin matrix proteins by odontoblast-like cells, MDPC-23 cells were cultivated (104 cells/cm2) in 24-well culture plates. After 12 h incubation in Dulbecco’s modified Eagle’s medium (DMEM), the cells were submitted to nutritional restriction by means of reducing the concentration of fetal bovine serum (FBS) for an additional 12 h. Cells were irradiated one single time with one of the following energy densities (EDs): 0.5, 2, 4, 10, or 15 J/cm2 and irradiance fixed at 20 mW/cm2. Non-irradiated cells served as control. After 72 h, cells were evaluated with regard to viability (methylthiazol tetrazolium technique (MTT)), mineralization nodule (MN) formation, total protein (TP) production, alkaline phosphatase activity (ALP), and collagen synthesis (Sircol), n?=?8. The data were submitted to Kruskal–Wallis and Mann–Whitney tests (p?>?0.05). There was no statistical difference between the viability of cells irradiated or not (control), for all the EDs. However, an increase in TP was observed for all the EDs when compared with the control group. A reduced ALP activity was seen in all irradiated groups, except for the ED of 0.5 J/cm2, which did not differ from the control. There was no difference between the irradiated groups and control regarding collagen synthesis, with the exception of the ED of 10 J/cm2, which inhibited this cell function. Significant reduction in MN occurred only for the EDs of 0.5 and 2 J/cm2. The single irradiation with blue LED (455 nm), irradiance of 20 mW/cm2, and energy densities ranging from 0.5 to 15 J/cm2 exerted no effective biostimulatory capacity on odontoblast-like cells. 相似文献
995.
M. Coşkun N. Ilhan A. Elbeyli M. M. Rifaioğlu M. Inci R. Davran E. A. Tuzcu A. Yarbağ M. Davarci A. Gökçe 《Andrologia》2016,48(5):536-541
The aim of this study was to investigate whether retinal vasculature changes had occurred (retinal artery diameter, retinal vein diameter and artery/vein ratio) in patients with varicocele. This pilot study included 50 healthy subjects with any eye disease apart from slight refractive errors and 55 patients with varicocele. Retinal arteriolar and venular diameters were measured and summarised as central retinal arteriolar equivalent (CRAE) and central retinal venular equivalent (CRVE). Retinal microvascular diameters and the arteriolar–to‐venular ratio (AVR) were assessed with a digital retinal camera. All measurements and calculations were performed using a computer‐based program. The mean CRAE value was 151.8 ± 3.6 μm in the study group and 150.4 ± 4.5 μm in the control group. Mean CRVE value was 209.4 ± 5.9 μm in the study group and 200.1 ± 8.7 μm in the control group. AVR was found 0.72 ± 0.02 in the study group and 0.75 ± 0.03 in the control group. There were significant differences between groups in terms of CRVE and AVR. There were no significant differences between groups in terms of CRAE. The results of this study showed that the patients with varicocele showed significant changes on retinal vascular diameter. 相似文献
996.
997.
998.
999.