全文获取类型
收费全文 | 2716篇 |
免费 | 209篇 |
国内免费 | 13篇 |
专业分类
耳鼻咽喉 | 19篇 |
儿科学 | 57篇 |
妇产科学 | 59篇 |
基础医学 | 516篇 |
口腔科学 | 53篇 |
临床医学 | 292篇 |
内科学 | 626篇 |
皮肤病学 | 29篇 |
神经病学 | 296篇 |
特种医学 | 41篇 |
外科学 | 295篇 |
综合类 | 4篇 |
预防医学 | 232篇 |
眼科学 | 40篇 |
药学 | 193篇 |
中国医学 | 15篇 |
肿瘤学 | 171篇 |
出版年
2023年 | 23篇 |
2022年 | 43篇 |
2021年 | 103篇 |
2020年 | 57篇 |
2019年 | 75篇 |
2018年 | 105篇 |
2017年 | 70篇 |
2016年 | 72篇 |
2015年 | 82篇 |
2014年 | 100篇 |
2013年 | 147篇 |
2012年 | 253篇 |
2011年 | 263篇 |
2010年 | 157篇 |
2009年 | 107篇 |
2008年 | 205篇 |
2007年 | 204篇 |
2006年 | 200篇 |
2005年 | 179篇 |
2004年 | 140篇 |
2003年 | 158篇 |
2002年 | 126篇 |
2001年 | 5篇 |
2000年 | 4篇 |
1999年 | 8篇 |
1998年 | 12篇 |
1997年 | 9篇 |
1996年 | 5篇 |
1995年 | 7篇 |
1994年 | 2篇 |
1993年 | 5篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1987年 | 2篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1982年 | 1篇 |
1978年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有2938条查询结果,搜索用时 375 毫秒
31.
Unlike in most of the world, HIV incidence in the former Soviet Union continues to rise. While international labor migration has been identified as a potentially important contributor to this trend, most attention has been focused on risks of male migrants themselves. This study uses recent household survey data to examine HIV-related perceptions and actions of migrants’ left-behind wives in Armenia. Multivariate logistic regression analyses show that migrants’ wives are significantly more likely to suspect their husbands of extramarital sex than are non-migrants’ wives. The analyses detect greater worries about HIV infection and a higher likelihood of spousal communication on HIV matters among migrants’ wives, compared to non-migrants’ wives, but these differences are largely explained by the suspicion of husband’s extramarital sex. Finally, no difference between the two categories of women in the probability of consistent condom use with husbands is found. These findings are interpreted within the context of patriarchal culture and unequal gender relations in Armenian society as they are further reinforced by male migration. Implications of these findings for policies to increase women’s awareness of HIV risks associated with migration and their ability to reduce those risks are discussed. 相似文献
32.
Frédéric Gabriel Ayman Sabra Sofiane El-Kirat-Chatel Sophie Pujol Valérie Fitton-Ouhabi Daniel Brèthes Karine Dementhon Isabelle Accoceberry Thierry No?l 《Antimicrobial agents and chemotherapy》2014,58(8):4476-4485
We characterized two additional membrane transporters (Fur4p and Dal4p) of the nucleobase cation symporter 1 (NCS1) family involved in the uptake transport of pyrimidines and related molecules in the opportunistic pathogenic yeast Candida lusitaniae. Simple and multiple null mutants were constructed by gene deletion and genetic crosses. The function of each transporter was characterized by supplementation experiments, and the kinetic parameters of the uptake transport of uracil were measured using radiolabeled substrate. Fur4p specifically transports uracil and 5-fluorouracil. Dal4p is very close to Fur4p and transports allantoin (glyoxyldiureide). Deletion of the FUR4 gene confers resistance to 5-fluorouracil as well as cross-resistance to triazoles and imidazole antifungals when they are used simultaneously with 5-fluorouracil. However, the nucleobase transporters are not involved in azole uptake. Only fluorinated pyrimidines, not pyrimidines themselves, are able to promote cross-resistance to azoles by both the salvage and the de novo pathway of pyrimidine synthesis. A reinterpretation of the data previously obtained led us to show that subinhibitory doses of 5-fluorocytosine, 5-fluorouracil, and 5-fluorouridine also were able to trigger resistance to fluconazole in susceptible wild-type strains of C. lusitaniae and of different Candida species. Our results suggest that intracellular fluorinated nucleotides play a key role in azole resistance, either by preventing azoles from targeting the lanosterol 14-alpha-demethylase or its catalytic site or by acting as a molecular switch for the triggering of efflux transport. 相似文献
33.
34.
35.
Adan Hernandez Chunfeng Tan Florian Plattner Aric F. Logsdon Karine Pozo Mohammad A. Yousuf Tanvir Singh Ryan C. Turner Brandon P. Luke-Wold Jason D. Huber Charles L. Rosen James A. Bibb 《Molecular brain》2018,11(1):64
Direct or indirect exposure to an explosion can induce traumatic brain injury (TBI) of various severity levels. Primary TBI from blast exposure is commonly characterized by internal injuries, such as vascular damage, neuronal injury, and contusion, without external injuries. Current animal models of blast-induced TBI (bTBI) have helped to understand the deleterious effects of moderate to severe blast forces. However, the neurological effects of mild blast forces remain poorly characterized. Here, we investigated the effects caused by mild blast forces combining neuropathological, histological, biochemical and neurophysiological analysis. For this purpose, we employed a rodent blast TBI model with blast forces below the level that causes macroscopic neuropathological changes. We found that mild blast forces induced neuroinflammation in cerebral cortex, striatum and hippocampus. Moreover, mild blast triggered microvascular damage and axonal injury. Furthermore, mild blast caused deficits in hippocampal short-term plasticity and synaptic excitability, but no impairments in long-term potentiation. Finally, mild blast exposure induced proteolytic cleavage of spectrin and the cyclin-dependent kinase 5 activator, p35 in hippocampus. Together, these findings show that mild blast forces can cause aberrant neurological changes that critically impact neuronal functions. These results are consistent with the idea that mild blast forces may induce subclinical pathophysiological changes that may contribute to neurological and psychiatric disorders. 相似文献
36.
37.
Andr��a Chabot-Naud George Rakovich Karine Chagnon Denise Ouellette Gilles Beauchamp 《Canadian respiratory journal》2011,18(2):79-80
A case of azygos lobe is presented. An azygos lobe is an accessory lobe of the lung that may occasionally be confused with a pathological process such as a bulla, lung abscess or neoplasm. Its pathogenesis is discussed, as are the characteristic x-ray features that enable an accurate diagnosis. 相似文献
38.
Helle Håkonsen Karine Lees Else-Lydia Toverud 《International journal of clinical pharmacy》2014,36(6):1144-1151
Background Western societies’ need for knowledge about how to meet the challenges in health care following increased immigration has emerged as studies have showed that non-Western immigrants tend to experience more obstacles to drug use and poorer communication with health professionals. Objectives To identify the cultural barriers encountered by Norwegian community pharmacists in providing service to non-Western immigrant patients and to outline how they are being addressed. Setting Community pharmacies in Oslo, Norway. Methods A qualitative study consisting of four focus groups was conducted. In total 19 ethnic Norwegian pharmacists (17 female and 2 male; mean age: 40.6 years) participated. They were recruited from 13 pharmacies situated in areas of Oslo densely populated by non-Western immigrants. The audio-records of the focus group discussions were transcribed verbatim. A thematic content analysis was conducted. Main outcome measure Cultural barriers identified by Norwegian community pharmacists in the encounter with non-Western immigrants. Results All the pharmacists were in contact with non-Western immigrant patients on a daily basis. They said that they found it challenging to provide adequate service to these patients, and that the presence of language as well as other cultural barriers not only affected what the patients got out of the available information, but also to a great extent what kind of and how much information was provided. Although the pharmacists felt that immigrant patients were in great need of drug counselling, there were large disparities in how much effort was exerted in order to provide this service. They were all uncomfortable with situations where family or friends acted as interpreters, especially children. Otherwise, cultural barriers were related to differences in body language and clothing which they thought distracted the communication. All the pharmacists stated that they had patients asking about the content of pork gelatin in medicines, but few said that they habitually notified the patients of this unless they were asked directly. Ramadan fasting was not identified as a subject during drug counselling. Conclusion This focus group study shows that language and other cultural barriers, including differences in body language, non-Western gender roles, and all-covering garments, are of great concern for ethnic Norwegian community pharmacists in the encounter with non-Western immigrant patients. Although the pharmacists recognise their role as drug information providers for immigrant patients, large disparities were detected with respect to kind of and amount of information provided to these patients. 相似文献
39.
40.
Karine Pérès Ahmadou Alioum Pascale Barberger-Gateau 《Disability and rehabilitation》2013,35(5):263-276
Purpose:?To study the factors associated with progression, recovery and death from different grades of disability in elderly people.Method:?The sample included 3198 participants of the PAQUID (‘Personnes Agées QUID’) cohort, aged 65 and over and community-dwellers at baseline. Subjects were re-interviewed 1, 3, 5, 8 and 10 years after baseline. A five-state Markov model was used to estimate transition intensities between four grades of disability and toward death. We used a hierarchic scale of disability, which combines basic and instrumental activities of daily living and mobility. Several explanatory variables were investigated: medical, personal and environmental factors.Results:?The factors associated with progression and/or no recovery of disability were cardiovascular diseases, stroke and diabetes, low cognition, visual impairment and dyspnoea (for pathologies and impairments), older age, female gender, low educational level (for risk factors), depression (for intra-individual factor) and being married, recent hospitalization and number of drugs (for extra-individual factors). Older age, male gender, tobacco consumption and living in an urban area were associated with mortality.Conclusions:?These findings confirm the independent contribution of each group of variables in the disablement process and stress their different impact on progression of disability or on recovery from different grades of disability. 相似文献