全文获取类型
收费全文 | 154229篇 |
免费 | 6506篇 |
国内免费 | 492篇 |
专业分类
耳鼻咽喉 | 2594篇 |
儿科学 | 4555篇 |
妇产科学 | 3520篇 |
基础医学 | 20751篇 |
口腔科学 | 5527篇 |
临床医学 | 9662篇 |
内科学 | 37574篇 |
皮肤病学 | 4948篇 |
神经病学 | 12431篇 |
特种医学 | 3470篇 |
外国民族医学 | 2篇 |
外科学 | 18650篇 |
综合类 | 953篇 |
一般理论 | 43篇 |
预防医学 | 15114篇 |
眼科学 | 3347篇 |
药学 | 10867篇 |
中国医学 | 871篇 |
肿瘤学 | 6348篇 |
出版年
2023年 | 992篇 |
2022年 | 1665篇 |
2021年 | 4144篇 |
2020年 | 2052篇 |
2019年 | 3925篇 |
2018年 | 5636篇 |
2017年 | 3331篇 |
2016年 | 3181篇 |
2015年 | 3571篇 |
2014年 | 4775篇 |
2013年 | 6854篇 |
2012年 | 10775篇 |
2011年 | 11607篇 |
2010年 | 6085篇 |
2009年 | 4713篇 |
2008年 | 8938篇 |
2007年 | 9451篇 |
2006年 | 8752篇 |
2005年 | 8721篇 |
2004年 | 7793篇 |
2003年 | 7249篇 |
2002年 | 6719篇 |
2001年 | 4375篇 |
2000年 | 4948篇 |
1999年 | 3865篇 |
1998年 | 822篇 |
1997年 | 633篇 |
1996年 | 522篇 |
1995年 | 461篇 |
1994年 | 369篇 |
1993年 | 300篇 |
1992年 | 1486篇 |
1991年 | 1234篇 |
1990年 | 1119篇 |
1989年 | 919篇 |
1988年 | 796篇 |
1987年 | 733篇 |
1986年 | 741篇 |
1985年 | 637篇 |
1984年 | 454篇 |
1983年 | 382篇 |
1979年 | 425篇 |
1975年 | 298篇 |
1974年 | 380篇 |
1973年 | 386篇 |
1972年 | 328篇 |
1971年 | 357篇 |
1970年 | 323篇 |
1969年 | 345篇 |
1968年 | 304篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
An important part of fundamental research in catalysis is based on theoretical and modeling foundations which are closely connected with studies of single-crystalline catalyst surfaces. These so-called model catalysts are often prepared in the form of epitaxial thin films, and characterized using advanced material characterization techniques. This concept provides the fundamental understanding and the knowledge base needed to tailor the design of new heterogeneous catalysts with improved catalytic properties. The present contribution is devoted to development of a model catalyst system of CeO2 (ceria) on the Cu(111) substrate. We propose ways to experimentally characterize and control important parameters of the model catalyst—the coverage of the ceria layer, the influence of the Cu substrate, and the density of surface defects on ceria, particularly the density of step edges and the density and the ordering of the oxygen vacancies. The large spectrum of controlled parameters makes ceria on Cu(111) an interesting alternative to a more common model system ceria on Ru(0001) that has served numerous catalysis studies, mainly as a support for metal clusters. 相似文献
32.
Rubens Souza de OLIVEIRA Lanna Jamile Corrêa da COSTA Fernanda Atanaena Gon?alves de ANDRADE Wilson UIEDA Luzia Fátima Alves MARTORELLI Ana Paula de Arruda Geraldes KATAOKA Elizabeth Salbé Travassos da ROSA Pedro Fernando da Costa VASCONCELOS Armando de Souza PEREIRA Ant?nio Ismael Barros do CARMO Marcus Emanuel Barroncas FERNANDES 《Revista do Instituto de Medicina Tropical de S?o Paulo》2015,57(6):497-503
The outbreaks of rabies in humans transmitted by Desmodus rotundus in 2004 and 2005,
in the northeast of the Brazilian State of Para, eastern Amazon basin, made this a
priority area for studies on this zoonosis. Given this, the present study provides
data on this phenomenon in an urban context, in order to assess the possible
circulation of the classic rabies virus (RABV) among bat species in Capanema, a town
in the Amazon basin. Bats were collected, in 2011, with mist nets during the wet and
dry seasons. Samples of brain tissue and blood were collected for virological and
serological survey, respectively. None of the 153 brain tissue samples analyzed
tested positive for RABV infection, but 50.34% (95% CI: 45.67-55.01%) of the serum
samples analyzed were seropositive. Artibeus planirostris was the most common
species, with a high percentage of seropositive individuals (52.46%, 95% CI: 52.31
52.60%). Statistically, equal proportions of seropositive results were obtained in
the rainy and dry seasons (c2 = 0.057, d.f. = 1, p = 0.88). Significantly
higher proportions of males (55.96%, 95% CI: 48.96-62.96%) and adults (52.37%, 95%
CI: 47.35-57.39%) were seropositive. While none of the brain tissue samples tested
positive for infection, the high proportion of seropositive specimens indicates that
RABV may be widespread in this urban area. 相似文献
33.
Dalia Magaña 《Health communication》2020,35(5):649-657
ABSTRACTThis study closely examines 51 breast cancer narratives Latina and Spanish women wrote for other patients to illuminate how they conceptualize their health, with insights for addressing health disparities. Using discourse analysis of the role of language and culture in health care communication, this study focuses on the use of metaphors in the narratives. This provides revelations about the cultural and linguistic aspects of how the writers conceptualize their disease. Building on past research on metaphor use in cancer discourse in the English language, this study reveals the prevalence of metaphors comparing cancer to combat, or more generally, violence (e.g., “my battle against cancer”), or a journey (e.g., “my path with cancer”). Writers used this metaphorical language to offer advice to others with cancer and to mark their membership in a larger community of people with cancer. We also find that Spanish women use metaphors more frequently than Latinas and that they differed in their metaphorical portrayals of cancer. This research uncovers culturally embedded themes that are central to how women with cancer think about the disease, such as the prominence of spirituality in Latinas’ metaphorical constructions, a pattern not evident in Spanish women’s narratives. 相似文献
34.
G Steinitz M C Martín N Gazit-Yaari M L Quesada J de la Nuez R Casillas U Malik Z B Begin 《Applied radiation and isotopes》2006,64(4):520-524
Multi-day signals, generally with duration of 2-10 days, are a prominent temporal variation type of radon (Rn) in geogas in the unsaturated zone. Rare multi-day Rn signals have been found which are characterized by: (a) a declining limb lasting up to 10 days which conforms to the radioactive decay of Rn, (b) recurs at the same location and (c) is recorded in diverse situations-volcanic and seismogenic. It suggested that a Rn blob is injected at a lower level on a steady upward flow of geogas whereby the rise and final fall of the signal are attributed to the edges of the blob while the central Rn-decay segment records the passing of the decaying blob itself. Rn-decay signals are a small subset of multi-day Rn signals which are considered as highly irregular and unusable for the understanding of geophysical processes. In difference, it is concluded that multi-day Rn signals are probably proxies of subtle geodynamic processes at upper crustal levels and are therefore significant for studying such processes. 相似文献
35.
H. Wessling C. L. Simosono M. Escosa-Bagé P. de las Heras-Echeverría 《Acta neurochirurgica》2006,148(6):673-675
Summary We present a case of blindness and Anton’s syndrome in a psychiatric patient with late diagnosis of a giant frontal meningioma.
The criteria for advanced diagnostic imaging in the psychiatric population are discussed. We conclude that MR or CT scan is
indicated in psychiatric in-patients who fail to improve with standard psychiatric treatment. This strategy should be submitted
to a cost-benefit analysis. 相似文献
36.
I García-Rubio C Martínez-Cócera T Robledo Echarren S Vázquez Cortés 《Journal of investigational allergology & clinical immunology》2006,16(4):264-265
Eye drops contain several ophthalmic medications which can produce allergic reactions. We report the case of a patient with contact dermatitis from neomycin and a probable fixed exanthema after parenteral administration of tobramycin who tolerated topical tobramycin and other aminoglycosides. 相似文献
37.
José Luis R Martin Víctor Pérez Montse Sacristán Fernando Rodríguez-Artalejo Cristóbal Martínez Enric Alvarez 《European psychiatry》2006,21(1):11-20
OBJECTIVE: To assess antipsychotic medication in the treatment of schizophrenia, based on trial drop-out rates. METHOD: The studies included were randomised controlled trials that compared any of the four clinically best-established atypical antipsychotics (quetiapine, olanzapine, risperidone or clozapine) against either of two typical antipsychotics regarded as the gold standard (haloperidol or chlorpromazine). RESULTS: Meta-analysis indicated less risk of all-cause patient withdrawal from atypical medication trials where dosage was flexible, in both the short, relative risk (RR) 0.70 (95% CI 0.64-0.76), P<0.00001, and long term, RR 0.72 (0.65-0.80), P<0.00001. Similar results were observed for withdrawal due to adverse events, RR: 0.54 (0.41-0.72), P<0.0001. Nevertheless, the favourable effects of atypical medication disappeared in trials relying on fixed dosage. CONCLUSIONS: We detected a significant positive effect in terms of the outcome of treatment discontinuation for atypical versus typical medication, though only where the use of flexible rather than fixed doses (closer to an experimental control situation) was possible. 相似文献
38.
Mariana Spitz Alexandre Aluízio Costa Machado Rodrigo do Carmo Carvalho Fernanda Martins Maia Monica Santoro Haddad Dagoberto Calegaro Milberto Scaff Egberto Reis Barbosa 《Movement disorders》2006,21(9):1520-1522
We report on 3 patients with pseudoathetosis, which are involuntary, slow, writhing movements due to loss of proprioception. 相似文献
39.
40.