全文获取类型
收费全文 | 305753篇 |
免费 | 10952篇 |
国内免费 | 2006篇 |
专业分类
耳鼻咽喉 | 4260篇 |
儿科学 | 10213篇 |
妇产科学 | 9724篇 |
基础医学 | 42443篇 |
口腔科学 | 9135篇 |
临床医学 | 23918篇 |
内科学 | 55243篇 |
皮肤病学 | 6797篇 |
神经病学 | 19124篇 |
特种医学 | 14195篇 |
外国民族医学 | 100篇 |
外科学 | 44947篇 |
综合类 | 6278篇 |
一般理论 | 35篇 |
预防医学 | 24258篇 |
眼科学 | 6987篇 |
药学 | 23121篇 |
2篇 | |
中国医学 | 955篇 |
肿瘤学 | 16976篇 |
出版年
2018年 | 5044篇 |
2017年 | 4978篇 |
2016年 | 4282篇 |
2015年 | 6181篇 |
2014年 | 6024篇 |
2013年 | 5655篇 |
2012年 | 13068篇 |
2011年 | 8258篇 |
2010年 | 4329篇 |
2009年 | 5759篇 |
2008年 | 5239篇 |
2007年 | 6186篇 |
2006年 | 6426篇 |
2005年 | 14074篇 |
2004年 | 15395篇 |
2003年 | 10795篇 |
2002年 | 5904篇 |
2001年 | 10893篇 |
2000年 | 8536篇 |
1999年 | 11291篇 |
1998年 | 2316篇 |
1997年 | 1625篇 |
1992年 | 10339篇 |
1991年 | 10618篇 |
1990年 | 10603篇 |
1989年 | 10243篇 |
1988年 | 9670篇 |
1987年 | 9259篇 |
1986年 | 8807篇 |
1985年 | 7998篇 |
1984年 | 5474篇 |
1983年 | 4593篇 |
1982年 | 1941篇 |
1981年 | 1568篇 |
1980年 | 1573篇 |
1979年 | 5568篇 |
1978年 | 3442篇 |
1977年 | 2697篇 |
1976年 | 2424篇 |
1975年 | 3548篇 |
1974年 | 4340篇 |
1973年 | 4065篇 |
1972年 | 4007篇 |
1971年 | 3855篇 |
1970年 | 3580篇 |
1969年 | 3475篇 |
1968年 | 3176篇 |
1967年 | 2961篇 |
1966年 | 2657篇 |
1965年 | 1579篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
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
42.
43.
44.
45.
Lars J Vatten Tom I L Nilsen P?l R Romundstad Wenche B Dr?yvold Jostein Holmen 《European journal of cardiovascular prevention and rehabilitation》2006,13(6):909-915
OBJECTIVE: To investigate whether cardiovascular mortality related to obesity could be modified by physical activity. DESIGN: Mortality follow-up. SETTING: Population study. PARTICIPANTS: Participants in a health survey: 34 868 women and 32 872 men free from known cardiovascular disease or diabetes at baseline. MAIN OUTCOME MEASURES: Total cardiovascular mortality. MAIN RESULTS: During 16 years of follow-up, 3026 women and 3526 men had died from cardiovascular causes. In middle age, obesity [body mass index (BMI) of 30 or higher] was associated with increased risk of cardiovascular death, but the association weakened with age. After 70, there was no association between BMI and cardiovascular death. At all ages, a lower level of physical activity was associated with a higher cardiovascular mortality. In women with high physical activity, indicated by at least 30 min of moderate to vigorous activity more than once a week, cardiovascular mortality was only slightly higher in the obese compared to lean women (adjusted relative risk, 1.27; 95% confidence interval, 0.80-2.00). In men with high physical activity, cardiovascular mortality was, however, significantly higher among the obese (relative risk, 1.62; 95% confidence interval, 1.09-2.40). In both genders cardiovascular mortality was substantially higher in obese people who reported no regular physical activity compared to obese people with a high level of physical activity. CONCLUSION: In obese women, being highly active may, to a large extent, compensate for the risk-increasing effect of being obese, whereas in obese men who engage in a high level of physical activity, the risk of cardiovascular death may be higher than in lean and equally active men. 相似文献
46.
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
47.
Jaros?aw Felu? Wojciech Rad?o Bart?omiej Kowalczyk 《Chirurgia narzadów ruchu i ortopedia polska》2006,71(2):107-112
Nine wrists in eight patients were treated surgically between 1988 and 2003 for symptomatic Madelung's deformity. The pain of involved wrist followed by forearm deformation fulfilled criteria for surgery. Closing wedge osteotomy of the distal radius were carried out eight times accompanied by shortening of the ulna (four patients), excision of the distal ulna (one patient), and no ulnar surgery (three patients). Pain relieved after surgery. The follow up period ranged from 1 to 9.5 years. No pour results were stated in subjective patient's estimation during final check up. Wrist appearance were stated to be satisfactory. Limitation of the range of motion concerning supination and pronation of the forearm were stated invariably. X-ray retrospective assessment of the inclination angle, lunate coverage and presence of arthritic changes were conducted. Time and method of surgical treatment for Madelung's deformity should be considered individually. 相似文献
48.
49.
50.
Background Percutaneous abdominal aortic aneurysm(AAA) repair has been previously described using the "preclose"technique and general endotrachial anesthesia (GA). 相似文献