全文获取类型
收费全文 | 3839篇 |
免费 | 198篇 |
国内免费 | 53篇 |
专业分类
耳鼻咽喉 | 42篇 |
儿科学 | 87篇 |
妇产科学 | 73篇 |
基础医学 | 371篇 |
口腔科学 | 115篇 |
临床医学 | 291篇 |
内科学 | 940篇 |
皮肤病学 | 51篇 |
神经病学 | 439篇 |
特种医学 | 157篇 |
外科学 | 894篇 |
综合类 | 3篇 |
预防医学 | 106篇 |
眼科学 | 105篇 |
药学 | 147篇 |
中国医学 | 2篇 |
肿瘤学 | 267篇 |
出版年
2024年 | 5篇 |
2023年 | 36篇 |
2022年 | 93篇 |
2021年 | 197篇 |
2020年 | 107篇 |
2019年 | 122篇 |
2018年 | 150篇 |
2017年 | 99篇 |
2016年 | 129篇 |
2015年 | 145篇 |
2014年 | 186篇 |
2013年 | 248篇 |
2012年 | 309篇 |
2011年 | 316篇 |
2010年 | 186篇 |
2009年 | 176篇 |
2008年 | 202篇 |
2007年 | 214篇 |
2006年 | 198篇 |
2005年 | 157篇 |
2004年 | 169篇 |
2003年 | 139篇 |
2002年 | 151篇 |
2001年 | 37篇 |
2000年 | 22篇 |
1999年 | 27篇 |
1998年 | 24篇 |
1997年 | 20篇 |
1996年 | 10篇 |
1995年 | 14篇 |
1994年 | 9篇 |
1993年 | 13篇 |
1992年 | 13篇 |
1991年 | 14篇 |
1990年 | 17篇 |
1989年 | 8篇 |
1988年 | 10篇 |
1987年 | 9篇 |
1986年 | 8篇 |
1985年 | 16篇 |
1984年 | 8篇 |
1983年 | 7篇 |
1982年 | 8篇 |
1981年 | 8篇 |
1978年 | 4篇 |
1971年 | 4篇 |
1970年 | 3篇 |
1969年 | 9篇 |
1968年 | 5篇 |
1966年 | 5篇 |
排序方式: 共有4090条查询结果,搜索用时 328 毫秒
51.
Cynthia Aristei Valentina Lancellotta Marco Piergentini Giacomo Costantini Simonetta Saldi Sara Chierchini Antonella Cavalli Luca Di Renzo Oscar Fiorucci Massimo Guasticchi Vittorio Bini Alessandro Ricci 《Brachytherapy》2019,18(1):57-62
Purpose
High-dose-rate, multicatheter interstitial brachytherapy is technically complex and operator-dependent, requiring lengthy training and specialized skills. Furthermore, until the advent of contouring on computerized tomography (CT) images, difficulties existed in locating the target volume precisely. The present article reports the results of a study that aimed at producing and validating a 3D-printed template to aid in target volume localization for multicatheter interstitial brachytherapy in patients with breast cancer.Methods and Materials
Thirteen patients, candidates for accelerated partial breast irradiation or boost, were enrolled in the study. The target volume was defined on CT slices, and a template with empty spaces corresponding to the target volume projection on the patient's skin was produced by a 3D printer. The procedure was compared with the standard method followed in our center (1) visually, by assessing overlap between the target volume projections on the patient's skin, (2) by X-ray findings, and (3) by intraclass correlation coefficient.Results
Visual assessment and X-ray findings showed the 3D-printed target volume always fell within the standard volume in all 13 patients. The intraclass correlation coefficient indicated moderate agreement for both the medial and the lateral skin projections.Conclusions
The 3-D printed templates constitute a quick, easy, and reliable method to localize the target volume for high-dose-rate interstitial multicathether brachytherapy in patients with breast cancer and can safely be used in clinical practice. 相似文献52.
53.
54.
Giacomo Zaccone Eugenia Rita Lauriano Gioele Capillo Michał Kuciel 《Acta histochemica》2018,120(7):630-641
In fishes, exploitation of aerial gas exchange has evolved independently many times, involving a variety of air-breathing organs. Indeed, air-breathing occurs in at least 49 known families of fish (Graham, 1997). Many amphibious vertebrates, at some stage of their development are actually trimodal breathers that use various combinations of respiratory surfaces to breath both water (skin and/or gill) and air (skin and/or lung). The present review examines the evolutionary implications of air-breathing organs in fishes and the morphology of the peripheral receptors and the neurotransmitter content of the cells involved in the control of air-breathing. Control of breathing, whether gill ventilation or air-breathing, is influenced by feedback from peripheral and/or central nervous system receptors that respond to changes in PO2, PCO2 and/or pH. Although the specific chemoreceptors mediating the respiratory reflexes have not been conclusively identified, studies in water-breathing teleosts have implicated the neuroepithelial cells (NECs) existing in gill tissues as the O2 sensitive chemoreceptors that initiate the cardiorespiratory reflexes in aquatic vertebrates. Some of the air-breathing fishes, such as Protopterus, Polypterus and Amia have been shown to have NECs in the gills and/or lungs, although the role of these receptors and their innervation in the control of breathing is not known. NECs have been also reported in the specialized respiratory epithelia of accessory respiratory organs (ARO’s) of some catfish species and in the gill and skin of the mudskipper Periophthalmodon schlosseri. Unlike teleosts matching an O2-oriented ventilation to ambient O2 levels, lungfishes have central and peripheral H+/CO2 receptors that control the acid-base status of the blood. 相似文献
55.
Tomaso Bottio Jonida Bejko Gianclaudio Falasco Giacomo Bortolussi Michele Gallo Vincenzo Tarzia Gino Gerosa 《Journal of artificial organs》2014,17(3):275-277
We describe the clinical course and treatment of a 58-year-old male with a primary cardiogenic shock, who underwent a minimally invasive off-pump ventricular-assist-device (VAD) implantation with the aid of paravertebral regional analgesia. He was extubated soon after the procedure, in the operating room, with the aim to reduce the right ventricle impairment. We illustrate how a minimally invasive implant may improve the clinical outcomes of VAD patients shortening their return time to active life. 相似文献
56.
Giacomo Mugnai Mariantonietta Cicoira Andrea Rossi Corrado Vassanelli 《Experimental & Clinical Cardiology》2011,16(2):51-53
Primary systemic amyloidosis is a relatively uncommon disease characterized by the production and deposition of pathological insoluble fibrillar proteins in organs and tissues. It has been estimated that between one-third and one-half of all patients with primary amyloidosis experience clinically significant cardiac involvement. The present study reports a case involving a 77-year-old woman with ischemic heart disease who presented to the cardiology department because of syncope due to slow atrial fibrillation. Laboratory tests revealed a monoclonal spike in the gamma fraction and impairment of renal function, normocytic anemia, mild hypercalcemia, hypoalbuminemia and increased levels of beta-2 microglobulin. Suspicion of cardiac involvement was supported by the echocardiographic pattern and increased levels of troponin I and brain natriuretic peptide, along with clinical signs of heart failure and systemic amyloidosis diagnosis, confirmed by abdominal fat aspiration. 相似文献
57.
58.
Michael C. Wimberly Aashis Lamsal Paolla Giacomo Ting-Wu Chuang 《The American journal of tropical medicine and hygiene》2014,91(4):677-684
The national resurgence of human West Nile virus (WNV) disease in 2012 raised questions about the factors responsible for WNV outbreaks. Interannual climatic variations may influence WNV amplification and transmission to humans through multiple pathways, including mosquito breeding habitats, gonotrophic cycles, extrinsic incubation, avian communities, and human behavior. We examined the influences of temperature and precipitation anomalies on interannual variation in human WNV cases in three regions of the United States. There were consistent positive influences of winter temperatures, weaker and more variable positive effects of spring and summer temperatures, and highly variable precipitation effects that ranged from positive to negative. The overwintering period may be a particularly important climatic constraint on the dynamics of WNV in cold-temperate regions of North America. Geographic differences in the seasonal timing and relative importance of climatic drivers of WNV risk likely reflect underlying variability in key ecological and social characteristics. 相似文献
59.
60.
Erika Limoncin Angela D’Alfonso Claudia Corallino Vincenza Cofini Giovanna Di Febbo Giacomo Ciocca 《Journal of psychosomatic obstetrics and gynaecology》2017,38(4):310-316
Introduction: To evaluate the impact of voluntary termination of pregnancy (VTOP) on the psycho-sexological well-being of females before/six months after the abortion.Methods: A sample of 194 women was recruited from three obstetrics and gynaecological divisions. The women were evaluated for the variables “sexual functioning” with the Female Sexual Function Index (FSFI), “depression” with the Beck Depression Inventory (BDI-II), and “anxiety state” with the Self-Rating Anxiety Scale (SAS) at time 0 (the beginning of the abortion procedure) and time 1 (six months after the abortion). Since 24 women refused to fill out the questionnaires, the final sample was composed of 170 women.Results: The women showed a slight although significant improvement in the mean FSFI score from time 0 (16.7?±?12.9) to time 1 (20.9?±?13.8) (p?0.001) which paralleled with a slight decrease in the incidence of clinically significant sexual dysfunction [49% (84/170) (time 0) versus 34.1% (58/170) (time 1)], (McNemar’s test; p?=?0.0241). The sub-group of younger women (18–25) showed a lesser increase in FSFI score from time 0 to time 1. In addition, both depression (p?=?0.048) and anxiety (p?0.001) significantly decreased over time. However, the female sexuality remained impaired since more than two thirds (69.5%) of women were sexually dysfunctional six months after VTOP.Discussion: Voluntary TOP may influence the sexuality of younger females differently from how it influences that of older women. Hence, the sexuality of younger female should be regularly supervised in follow-up examinations. 相似文献