全文获取类型
收费全文 | 1712篇 |
免费 | 100篇 |
国内免费 | 26篇 |
专业分类
耳鼻咽喉 | 19篇 |
儿科学 | 44篇 |
妇产科学 | 14篇 |
基础医学 | 263篇 |
口腔科学 | 238篇 |
临床医学 | 118篇 |
内科学 | 360篇 |
皮肤病学 | 23篇 |
神经病学 | 109篇 |
特种医学 | 83篇 |
外科学 | 119篇 |
综合类 | 7篇 |
预防医学 | 188篇 |
眼科学 | 17篇 |
药学 | 158篇 |
中国医学 | 25篇 |
肿瘤学 | 53篇 |
出版年
2023年 | 17篇 |
2022年 | 40篇 |
2021年 | 56篇 |
2020年 | 42篇 |
2019年 | 62篇 |
2018年 | 57篇 |
2017年 | 41篇 |
2016年 | 51篇 |
2015年 | 59篇 |
2014年 | 79篇 |
2013年 | 79篇 |
2012年 | 128篇 |
2011年 | 136篇 |
2010年 | 69篇 |
2009年 | 62篇 |
2008年 | 83篇 |
2007年 | 83篇 |
2006年 | 87篇 |
2005年 | 57篇 |
2004年 | 58篇 |
2003年 | 63篇 |
2002年 | 45篇 |
2001年 | 28篇 |
2000年 | 23篇 |
1999年 | 26篇 |
1998年 | 29篇 |
1997年 | 23篇 |
1996年 | 26篇 |
1995年 | 17篇 |
1994年 | 14篇 |
1993年 | 18篇 |
1992年 | 11篇 |
1991年 | 17篇 |
1990年 | 16篇 |
1989年 | 20篇 |
1988年 | 23篇 |
1987年 | 16篇 |
1986年 | 6篇 |
1985年 | 8篇 |
1984年 | 6篇 |
1983年 | 7篇 |
1982年 | 7篇 |
1979年 | 6篇 |
1977年 | 5篇 |
1976年 | 3篇 |
1975年 | 7篇 |
1974年 | 3篇 |
1973年 | 2篇 |
1970年 | 2篇 |
1968年 | 2篇 |
排序方式: 共有1838条查询结果,搜索用时 0 毫秒
31.
Ismael Nilo Lino de Queiroz Ana Luíza Gomes Quinderé José Ariévilo Gurgel Rodrigues Edfranck de Sousa Oliveira Vanderlei Natássia Albuquerque Ribeiro Renata Line da Conceição Rivanor Kátia Alves Ribeiro Chistiane Oliveira Coura Karuza Maria Alves Pereira Hellíada Vasconcelos Chaves Mirna Marques Bezerra Ianna Wivianne Fernandes de Araújo Norma Maria Barros Benevides 《Inflammation research》2015,64(12):971-982
32.
33.
Pereira Silva JA Costa Dias F Fonseca JE Canhao H Resende C Viana Queiroz M 《Clinical rheumatology》2004,23(1):19-20
Scuba diving is associated with a 90% reduction in effective weight and with the loss of a weight-bearing effect on joints. These conditions are very similar to the continuous weightlessness that occurs in spaceflight and bed-rest, which are clearly associated with significant bone mass loss. Here, we studied the bone mineral density (BMD) of 66 professional scuba divers using a dual-photon densitometer, and have depicted a reduction in the BMD in comparison to a matched control group of non-divers. Our results suggest that diving is also an activity where the unloading effect alters bone metabolism, leading to a reduction in BMD.Abbreviations BMD
Bone mineral density 相似文献
34.
Dulciene Maria Magalh?es Queiroz Mayuko Saito Gifone Aguiar Rocha Andreia Maria Camargos Rocha Fabrício Freire Melo William Checkley Lúcia Libanez Bessa C. Braga Igor Sim?es Silva Robert H. Gilman Jean E. Crabtree 《Journal of clinical microbiology》2013,51(11):3735-3740
Accurate noninvasive tests for diagnosing Helicobacter pylori infection in very young children are strongly required. We investigated the agreement between the [13C]urea breath test ([13C]UBT) and a monoclonal ELISA (HpSA) for detection of H. pylori antigen in stool. From October 2007 to July 2011, we enrolled 414 infants (123 from Brazil and 291 from Peru) of ages 6 to 30 months. Breath and stool samples were obtained at intervals of at least 3 months from Brazilian (n = 415) and Peruvian (n = 908) infants. [13C]UBT and stool test results concurred with each other in 1,255 (94.86%) cases (kappa coefficient = 0.90; 95% confidence interval [CI] = 0.87 to 0.92). In the H. pylori-positive group, delta-over-baseline (DOB) and optical density (OD) values were positively correlated (r = 0.62; P < 0.001). The positivity of the tests was higher (P < 0.001; odds ratio [OR] = 6.01; 95% CI = 4.50 to 8.04) in Peru (546/878; 62.2%) than in Brazil (81/377; 21.5%) and increased with increasing age in Brazil (P = 0.02), whereas in Peru it decreased with increasing age (P < 0.001). The disagreement between the test results was associated with birth in Brazil and female gender but not with age and diarrhea. Our results suggest that both [13C]UBT and the stool monoclonal test are reliable for diagnosing H. pylori infection in very young children, which will facilitate robust epidemiological studies in infants and toddlers. 相似文献
35.
Eduarda Helena Leandro Nascimento Rocharles Cavalcante Fontenele Priscila de Azeredo Lopes Gustavo Machado Santaella Karla Faria Vasconcelos Deborah Queiroz de Freitas Anne Caroline Oenning Francisco Carlos Groppo 《Dento maxillo facial radiology》2021,50(3)
Objectives:To present the ballistic gelatin as a new material capable of simulating the soft tissues in cone-beam CT (CBCT) images.Methods:CBCT images of three piglet heads were acquired with their soft tissues intact (standard group). Subsequently, the piglet heads were fixed in a container using metallic pins and moulded with acrylic resin; the soft tissues were then removed and replaced by ballistic gelatin, with the same thickness of the original soft tissues. The images were evaluated by two oral radiologists, to check the adaptation on bone surfaces, thickness and density, penetration into large bone cavities and cancellous bone, and the presence of air bubbles using a 5-score scale. Additionally, an objective analysis was carried out by one oral radiologist. For each CBCT scan, three axial reconstructions were selected to represent the mandibular, occlusal, and maxillary levels. The mean and standard deviation (SD) of the grey values were calculated in four regions of interest determined on soft tissue areas and compared by two-way ANOVA.Results:The ballistic gelatin showed subjective scores ranging from good to excellent for all parameters evaluated. There was no significant difference in the mean and SD values of the grey values between ballistic gelatin and the gold standard groups for all levels (p > 0.05). Higher SD values were observed in the occlusal level for both groups (p < 0.05).Conclusions:Ballistic gelatin has visual and objective similarity with the gold standard. Thus, the ballistic gelatin is a promising material capable of simulating soft tissues in CBCT images. 相似文献
36.
Takahama Jr Ademar de Sousa Vitoria Iaros Tanaka Elisa Emi Ono Evelise Ito Fernanda Akemi Nakanishi Costa Priscila Paganini Pedriali Maria Beatriz Bergonse Pereira de Lima Heliton Gustavo Fornazieri Marco Aurélio Correia Leticia Sassaki Cardoso Lucienne Tibery Queiroz de Maio Carrilho Claudia Maria Dantas 《Clinical oral investigations》2021,25(3):1217-1222
Clinical Oral Investigations - This a cross-sectional study to evaluate the association between oral health findings and ventilator-associated pneumonia (VAP) among critically ill patients in... 相似文献
37.
38.
39.
Myrna Maria Arcanjo Frota Barros Maria Imaculada De Queiroz Rodrigues Francisco Wilker Mustafa Gomes Muniz Lidiany Karla Azevedo Rodrigues 《Clinical oral investigations》2020,24(2):521-532
This study aimed to systematically review the literature regarding the risk of selective removal—in comparison with stepwise and nonselective removal 相似文献
40.
Amlodipine reduces blood pressure during dynamic resistance exercise in hypertensive patients
下载免费PDF全文
![点击此处可从《Scandinavian journal of medicine & science in sports》网站下载免费的PDF全文](/ch/ext_images/free.gif)
D. R. Souza R. S. Gomides L. A. R. Costa A. C. C. Queiroz S. Barros K. C. Ortega D. Mion Jr T. Tinucci C. L. M. Forjaz 《Scandinavian journal of medicine & science in sports》2015,25(1):53-60
This study investigated the effect of the dihydropyridine calcium channel antagonist, amlodipine, on blood pressure (BP) during resistance exercise performed at different intensities in hypertensives. Eleven hypertensives underwent 4 weeks of placebo and amlodipine (random double‐blinded crossover design). In each phase, they performed knee extension exercise until exhaustion following three protocols: one set at 100% of 1 RM (repetition maximum), three sets at 80% of 1 RM, and three sets at 40% of 1 RM. Intraarterial BP was measured before and during exercise. Amlodipine reduced maximal systolic/diastolic BP values achieved at all intensities (100% = 225 ± 6/141 ± 3 vs. 207 ± 6/130 ± 6 mmHg; 80% = 289 ± 8/178 ± 5 vs. 273 ± 10/169 ± 6 mmHg; 40% = 289 ± 10/176 ± 8 vs. 271 ± 11/154 ± 6 mmHg). Amlodipine blunted the increase in diastolic BP that occurred during the second and third sets of exercise at 40% of 1RM (+75 ± 6 vs. +61 ± 5 mmHg and +78 ± 7 vs. +64 ± 5 mmHg, respectively). Amlodipine was effective in reducing the absolute values of systolic and diastolic BP during resistance exercise and in preventing the progressive increase in diastolic BP that occurs over sets of low‐intensity exercise. These results suggest that systemic vascular resistance is involved in BP increase during resistance exercise, and imply that hypertensives receiving amlodipine are at lower risk of increased BP during resistance exercise than non‐medicated patients. 相似文献