全文获取类型
收费全文 | 1281088篇 |
免费 | 97975篇 |
国内免费 | 1996篇 |
专业分类
耳鼻咽喉 | 18446篇 |
儿科学 | 44477篇 |
妇产科学 | 35045篇 |
基础医学 | 182485篇 |
口腔科学 | 33615篇 |
临床医学 | 111389篇 |
内科学 | 258651篇 |
皮肤病学 | 28122篇 |
神经病学 | 100545篇 |
特种医学 | 51246篇 |
外国民族医学 | 660篇 |
外科学 | 196818篇 |
综合类 | 27100篇 |
现状与发展 | 1篇 |
一般理论 | 377篇 |
预防医学 | 95882篇 |
眼科学 | 27949篇 |
药学 | 95045篇 |
2篇 | |
中国医学 | 2432篇 |
肿瘤学 | 70772篇 |
出版年
2018年 | 13193篇 |
2017年 | 10009篇 |
2016年 | 10957篇 |
2015年 | 12427篇 |
2014年 | 17217篇 |
2013年 | 26319篇 |
2012年 | 36144篇 |
2011年 | 38181篇 |
2010年 | 22890篇 |
2009年 | 21871篇 |
2008年 | 36730篇 |
2007年 | 39375篇 |
2006年 | 39602篇 |
2005年 | 38544篇 |
2004年 | 37658篇 |
2003年 | 36532篇 |
2002年 | 35883篇 |
2001年 | 64029篇 |
2000年 | 66544篇 |
1999年 | 56459篇 |
1998年 | 15148篇 |
1997年 | 13765篇 |
1996年 | 14209篇 |
1995年 | 13467篇 |
1994年 | 12775篇 |
1993年 | 11805篇 |
1992年 | 44589篇 |
1991年 | 43496篇 |
1990年 | 42237篇 |
1989年 | 40140篇 |
1988年 | 36929篇 |
1987年 | 36264篇 |
1986年 | 33647篇 |
1985年 | 32297篇 |
1984年 | 24150篇 |
1983年 | 20291篇 |
1982年 | 11739篇 |
1981年 | 10700篇 |
1980年 | 9524篇 |
1979年 | 21357篇 |
1978年 | 14832篇 |
1977年 | 12547篇 |
1976年 | 11714篇 |
1975年 | 12645篇 |
1974年 | 14683篇 |
1973年 | 14133篇 |
1972年 | 12959篇 |
1971年 | 11752篇 |
1970年 | 11072篇 |
1969年 | 10039篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
A. Ríos A.I. López-Navas M.A. Ayala G. Garrido M.J. Sebastián J. Carrillo Á. Sánchez J. Flores-Medina J.J. Ruiz-Manzanera A.M. Hernández P. Ramírez P. Parrilla 《Transplantation proceedings》2019,51(2):258-260
The Latin American population has a double way of immigration, one toward the United States by proximity and another toward Spain by sociocultural affinity. This population increase is affecting organ donation and transplantation in receiving countries.
Objective
To analyze the brain death (BD) concept knowledge in the Dominican Republic immigrant population in Florida (United States) and Spain.Method
Population under study: Population born in the Dominican Republic, resident in Florida (United States) and in Spain. Inclusion criteria: Population older than 15 years stratified by age and sex. Assessment instrument: Donation attitude questionnaire PCID-DTO-Ríos. Fieldwork: Random selection based on stratification. Immigration support association collaboration in Florida and Spain was needed to locate potential respondents. Completion was anonymous and self-administered, with verbal consent.Results
A total of 123 respondents, 57 residents in Spain and 66 in Florida, have been included in the study. The 27% (n = 33) of the respondents knowledgeable of the BD concept consider it the death of an individual. Of the remainder, 52% (n = 64) do not know about it, and the remaining 21% (n = 26) believe it does not mean the death of a patient. No differences were observed regarding migration countries (P > .05). There was no association of the BD concept with other psychosocial factors analyzed or with the attitude toward organ donation.Conclusions
Knowledge of the BD concept among the Dominican immigrant population is similar in Spain and Florida, and, unlike most studies, there is no objective association with the attitude toward organ donation. 相似文献92.
93.
94.
Prevalence of Potentially Inappropriate Prescribing Among Hong Kong Older Adults: A Comparison of the Beers 2003, Beers 2012, and Screening Tool of Older Person's Prescriptions and Screening Tool to Alert doctors to Right Treatment Criteria 下载免费PDF全文
95.
A high resolution depth attenuation product (Kdhires) was developed using MODIS 500 m and 250 m spectral bands. The Kdhires was compared with Wang’s operational Kd for the Chesapeake Bay. Minimal differences were observed between the two methods, with greatest deviation occurring in areas of high turbidity in the tributaries. After tuning the new Kdhires, the mean absolute error and bias between the two algorithms was 0.22 m?1 and 0.026 m?1, indicating good agreement. Higher spatial resolution provides for improved retrievals along the coast and into the narrow sections of the tributaries, coinciding with areas of concern to estuarine health and coastal management applications. 相似文献
96.
Abdelhadi Lahoum Nasserdine Sabaou Christian Bijani Noureddine Bouras Frédéric Pont Selma P. Snini Florence Mathieu 《Saudi Pharmaceutical Journal》2019,27(1):56-65
The actinobacterium strain ABH26 closely related to Saccharothrix xinjiangensis, isolated from an Algerian Saharan soil sample, exhibited highly antagonist activity against Gram-positive bacteria, yeasts and filamentous fungi. Its ability to produce antimicrobial compounds was investigated using several solid culture media. The highest antimicrobial activity was obtained on Bennett medium. The antibiotics secreted by strain ABH26 on Bennett medium were extracted by methanol and purified by reverse-phase HPLC using a C18 column. The chemical structures of the compounds were determined after spectroscopic (1H NMR, 13C NMR, 1H-1H COSY and 1H-13C HMBC spectra), and spectrometric (mass spectrum) analyses. Two new cyanogriside antibiotics named cyanogriside I (1) and cyanogriside J (2), were characterized along with three known caerulomycins, caerulomycin A (3), caerulomycin F (4) and caerulomycinonitrile (5). This is the first report of cyanogrisides and caerulomycins production by a member of the Saccharothrix genus. The minimum inhibitory concentrations (MIC) of these antibiotics were determined against pathogenic microorganisms. 相似文献
97.
98.
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
99.
100.
Bernard–Soulier syndrome (BSS) is a rare autosomal recessively inherited bleeding disorder. Pregnancy in patients with BSS is characterized by ante‐, intra‐, or postpartum haemorrhage, which may be delayed and severe. There is no consensus in the management of BSS in pregnancy and so far only 16 pregnancies in nine patients have been described. We report a further three pregnancies in two women with the syndrome. We also outline our management of pregnant patients with BSS. 相似文献