全文获取类型
收费全文 | 1030篇 |
免费 | 55篇 |
国内免费 | 4篇 |
专业分类
耳鼻咽喉 | 11篇 |
儿科学 | 18篇 |
妇产科学 | 15篇 |
基础医学 | 187篇 |
口腔科学 | 23篇 |
临床医学 | 117篇 |
内科学 | 192篇 |
皮肤病学 | 13篇 |
神经病学 | 97篇 |
特种医学 | 49篇 |
外国民族医学 | 1篇 |
外科学 | 159篇 |
综合类 | 15篇 |
预防医学 | 51篇 |
眼科学 | 28篇 |
药学 | 59篇 |
中国医学 | 11篇 |
肿瘤学 | 43篇 |
出版年
2024年 | 3篇 |
2023年 | 18篇 |
2022年 | 44篇 |
2021年 | 100篇 |
2020年 | 50篇 |
2019年 | 71篇 |
2018年 | 54篇 |
2017年 | 60篇 |
2016年 | 42篇 |
2015年 | 43篇 |
2014年 | 67篇 |
2013年 | 71篇 |
2012年 | 102篇 |
2011年 | 83篇 |
2010年 | 35篇 |
2009年 | 28篇 |
2008年 | 44篇 |
2007年 | 34篇 |
2006年 | 34篇 |
2005年 | 26篇 |
2004年 | 16篇 |
2003年 | 17篇 |
2002年 | 13篇 |
2001年 | 7篇 |
2000年 | 4篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1996年 | 4篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有1089条查询结果,搜索用时 0 毫秒
991.
Sadegh Chinikar Seyed Mojtaba Ghiasi Nariman Shah-Hosseini Ehsan Mostafavi Maryam Moradi Sahar Khakifirouz Fereshteh Sadat Rasi Varai Mahboubeh Rafigh Tahmineh Jalali Mohammad Mehdi Goya Mohammad Reza Shirzadi Mohammad Zainali Anthony R. Fooks 《Travel medicine and infectious disease》2013,11(3):166-169
992.
993.
Xuexian Yan Jian Kang Yanli Zhou Ramisa Ehsan Raghuveer Halkar Kimberly E. Applegate David M. Schuster 《Annals of nuclear medicine》2013,27(6):508-514
Objective
The purpose of this study is to investigate potential differences in the image quality of inpatient versus outpatient F-18-FDG PET/CT to provide evidence for appropriate policies and procedures to be promulgated on inpatient referrals.Methods
100 consecutive inpatient and 100 outpatient F-18-FDG PET/CT scans were compared from the same time period and PET/CT scanner. Each study was evaluated for a subjective overall rating (optimal vs. suboptimal), and also by objective measurements (SUVmean) in four background structures (brain, blood pool, liver, and muscle).Results
96 outpatient scans were rated optimal and 4 suboptimal whereas corresponding numbers for inpatient scans were 77 and 23 (p < 0.001). Of the objective indices, cerebellar SUV was significantly different in inpatient versus outpatient (5.3 vs. 6.9; p < 0.001) as well as suboptimal versus optimal rated groups (4.8 vs. 6.3; p < 0.001). While mean blood glucose was higher for inpatients (108.01 vs. 101.49 mg/dl; p = 0.017), it was not significantly different between optimal and suboptimal exams. Linear regression analysis between blood glucose levels and cerebellar uptake revealed an inverse relationship (R = ?0.38, p < 0.001).Conclusions
There was a significantly higher number of inpatient PET/CT scans rated as suboptimal in comparison to outpatient scans. Decreased cerebellar uptake was present in suboptimal rated studies and in inpatient studies. Altered biodistribution is thus a potential etiology of reduced scan quality among inpatients. These findings, if duplicated among other readers and centers, may form the basis of quality control recommendations for inpatient PET/CT ordering patterns. 相似文献994.
Saber Esamaeili Kayhan Azadmanesh Saied Reza Naddaf Minoarisoa Rajerison Elisabeth Carniel Ehsan Mostafavi 《Emerging infectious diseases》2013,19(9):1549-1551
Disease caused by Powassan virus (POWV), a tick-borne flavivirus, ranges from asymptomatic to severe neurologic compromise and death. Two cases of POWV meningoencephalitis in New York, USA, highlight diagnostic techniques, neurologic outcomes, and the effect of POWV on communities to which it is endemic. 相似文献
995.
996.
Ehsan Javanmard Hamed Mirjalali Maryam Niyyati Esfandiar Jalilzadeh Seyed Javad Seyed Tabaei Hamid Asadzadeh Aghdaei Ehsan Nazemalhosseini-Mojarad Mohammad Reza Zali 《International journal of hygiene and environmental health》2018,221(4):642-651
Background
Human-infecting microsporidia are a group of spore-forming eukaryotic microorganisms that can infect both animals and humans. Recent evidences indicate waterborne transmission of microsporidia spores to human via either drinking water or irrigation of vegetable farms with contaminated water resources. The current study aimed to evaluate the presence of human-infecting microsporidia in treated wastewater (TW) and vegetable farms irrigated with treated wastewater during a year.Methods
Totally, twelve samples of each treated wastewater and vegetables were collected. In order to recover microsporidia spores, filtration using cellulose nitrate membrane (pore size 0.4?μm) and sedimentation were employed. DNA extraction was performed for all samples and genus/species were characterized using specific primers. In order to characterize genotypes, ITS fragment of E. bieneusi was amplified, sequenced and compared in GenBank database. Phylogenetic tree was employed to analysis the probable correlation between obtained genotypes with those E. bieneusi genotypes, which were previously obtained from human and animals from same region.Results
After nested PCR, expected fragments of E. bieneusi and Encephalitozoon spp were observed among 5/12 (41.7%) and 1/12 (8.33%) of vegetable samples, respectively. From total of 12 TW samples, expected fragments of E. bieneusi and Encephalitozoon spp were amplified among 7/12 (53.8%) and 1/12 (8.33%) of TW samples, respectively. Genotypes D and E were characterized from both TW and vegetables samples. Phylogenetic analysis showed close-relationship between E. bieneusi from TW and vegetable samples with E. bieneusi from animals and humans obtained from the same region.Conclusion
Our findings suggested the key role of animals in epidemiology of zoonotic transmission of E. bieneusi. Moreover, our findings revealed the occurrence of human-infecting microsporidia in treated wastewater because of either insufficiency of treatment process or distribution of microsporidia spores in wastewater treatment plant via animals. 相似文献997.
Zohreh Fattahi Maryam Beheshtian Marzieh Mohseni Hossein Poustchi Erin Sellars Sayyed Hossein Nezhadi Amir Amini Sanaz Arzhangi Khadijeh Jalalvand Peyman Jamali Zahra Mohammadi Behzad Davarnia Pooneh Nikuei Morteza Oladnabi Akbar Mohammadzadeh Elham Zohrehvand Azim Nejatizadeh Mohammad Shekari Maryam Bagherzadeh Ehsan Shamsi‐Gooshki Stefan Brno Bernd Timmermann Aliakbar Haghdoost Reza Najafipour Hamid Reza Khorram Khorshid Kimia Kahrizi Reza Malekzadeh Mohammad R. Akbari Hossein Najmabadi 《Human mutation》2019,40(11):1968-1984
Considering the application of human genome variation databases in precision medicine, population‐specific genome projects are continuously being developed. However, the Middle Eastern population is underrepresented in current databases. Accordingly, we established Iranome database ( www.iranome.com ) by performing whole exome sequencing on 800 individuals from eight major Iranian ethnic groups representing the second largest population of Middle East. We identified 1,575,702 variants of which 308,311 were novel (19.6%). Also, by presenting higher frequency for 37,384 novel or known rare variants, Iranome database can improve the power of molecular diagnosis. Moreover, attainable clinical information makes this database a good resource for classifying pathogenicity of rare variants. Principal components analysis indicated that, apart from Iranian‐Baluchs, Iranian‐Turkmen, and Iranian‐Persian Gulf Islanders, who form their own clusters, rest of the population were genetically linked, forming a super‐population. Furthermore, only 0.6% of novel variants showed counterparts in “Greater Middle East Variome Project”, emphasizing the value of Iranome at national level by releasing a comprehensive catalog of Iranian genomic variations and also filling another gap in the catalog of human genome variations at international level. We introduce Iranome as a resource which may also be applicable in other countries located in neighboring regions historically called Greater Iran (Persia). 相似文献
998.
Noori Jafar Spotin Adel Ahmadpour Ehsan Mahami-Oskouei Mahmoud Sadeghi-Bazargani Homayoun Kazemi Tohid Sakhinia Ebrahim Aghebati-Maleki Leili Shahrivar Firooz 《Parasitology research》2018,117(6):1717-1727
Parasitology Research - The study of pathogenesis mechanisms of larval stages in the Taeniidae has recently focused on host genetic factors, particularly toll-like receptor (TLR) variations.... 相似文献
999.
1000.
Ehsan Latif 《Health economics》2014,23(6):751-759
The paper used longitudinal Canadian data from the National Population Health Survey to estimate the impact of macroeconomic conditions measured by provincial unemployment rate on individual obesity and BMI. To control for individual‐specific unobserved heterogeneity, the study utilized the conditional fixed effect logit and fixed effects models. The study found that unemployment rate had a significant positive impact on the probability of being severely obese. The study also found that unemployment rate significantly increased BMI. However, the study did not find any significant impact of unemployment rate on the probability of being overweight or obese. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献