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Genetic diversity and natural selection of Duffy binding protein of Plasmodium vivax Korean isolates
Ju, H.L.,Kang, J.M.,Moon, S.U.,Bahk, Y.Y.,Cho, P.Y.,Sohn, W.M.,Park, Y.K.,Park, J.W.,Kim, T.S.,Na, B.K. Verlag für Recht und Gesellschaft ; Elsevier 2013 Acta tropica Vol.125 No.1
Plasmodium vivax Duffy binding protein (PvDBP) is a micronemal type I membrane protein that plays an essential role in erythrocyte invasion of merozoites. PvDBP is a prime blood stage vaccine candidate antigen against P. vivax, but its polymorphic nature represents a major obstacle to the successful design of a protective vaccine against vivax malaria. In this study, we analyzed the genetic polymorphism and natural selection at the N-terminal cysteine-rich region of PvDBP (PvDBPII) among 70 P. vivax isolates collected from Korean patients during 2005-2010. Seventeen single nucleotide polymorphisms (SNP), which resulted in 14 non-synonymous and 3 synonymous mutations, were found in PvDBPII among the Korean P. vivax isolates. Sequence analyses revealed that 13 different PvDBPII haplotypes, which were clustered into 3 distinct clades, were identified in Korean P. vivax isolates. The difference between the rates of nonsynomyous and synonymous mutations suggested that the region has evolved under natural selection. High selective pressure preferentially acted on regions identified or predicted to be B- and T-cell epitopes and MHC binding regions of PvDBPII. Recombination may also contribute to genetic diversity of PvDBPII. Our results suggest that PvDBPII of Korean P. vivax isolates display a limited genetic polymorphism and are under selective pressure. These results have significant implications for understanding the nature of the P. vivax population circulating in Korea and provide useful information for development of malaria vaccines based on this antigen.
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Alexander Andersen Juhl,Peer Christiansen,Tine Engberg Damsgaard 한국유방암학회 2016 Journal of breast cancer Vol.19 No.4
Purpose: Persistent pain is a common side effect of breast cancer treatment. The present study aimed to assess the prevalence, associated treatment-related factors, and the type of pain (neuropathic or nociceptive) in patients who had undergone a unilateral mastectomy. Methods: All women who underwent a unilateral mastectomy at a University Hospital between 2009 and 2013 were eligible for inclusion. Women with breast reconstruction or active cancer were excluded. Participants were mailed a questionnaire evaluating the prevalence, location, intensity, and frequency of surgical site pain. Additionally, the painDETECT ®, a validated instrument to evaluate neuropathic pain, was mailed to all participants. Results: A total of 305 women were included, and of them, 261 (85.6%) completed the study questionnaire. After a median follow-up period of 3.0 years, 100 women (38.3%) reported experiencing pain at the surgical site. Body mass index ≥30 kg/m2, radiation therapy, and axillary lymph node dissection were significantly associated with persistent pain in univariate models. However, only body mass index ≥30 kg/m2 was independently associated with persistent pain (odds ratio, 2.13; 95% confidence interval, 1.06–4.27; p=0.034) in a multivariate analysis. Of the patients reporting pain, 71.0% were unlikely to have a neuropathic pain component. A moderate, but highly significant, positive correlation was observed between the pain intensity and the painDETECT® score (rs=0.47, p<0.001). Conclusion: Persistent pain after breast cancer treatment continues to have a high prevalence. Our results indicate that the largest proportion of patients experiencing persistent pain after breast cancer treatment do not have a clear neuropathic pain component.
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