Quantification of nucleotides and their sugar conjugates in biological samples: Purposes, instruments and applications
Publication date: 5 September 2018Source: Journal of Pharmaceutical and Biomedical Analysis, Volume 158Author(s): Xuan Qin, Xin WangAbstractNucleotides and their sugar conjugates are fundamental molecules in life, participating in processes of DNA/RNA composition, cell wall build-up, glycosylation reactions, and signal conduction. Therefore, the quantification of these compounds in biological samples significantly benefits the understanding of their functions. However, nucleotides and nucleotide sugars are extremely hydrophilic, causing bad retention and peak symmetry on regular C18 chromatographic columns. To solve this problem, ion-pair (IP) chromatography, ion-exchange (IE) chromatography and hydrophilic interaction chromatography (HILIC) were applied, of which differentiated mechanisms were utilized to increase the retention of the analytes on the stationary phases. IP-HPLC and HILIC were convenient for coupling with many kinds of detectors (ultraviolet, UV or mass spectrometry, MS). Combining these two kinds of techniques, the advantages of better separation and retention were increased, while disadvantages like irreversible adsorption by stationary phases were greatly decreased. Due to the high concentrations of nonvolatile buffer salts used, IE-HPLC was not suitable for MS detectors. Protein precipitation and solid phase extraction were the common methods for sample treatment in the analysis of nucleotides and nucleotide sugars. By carefully optimizing the LCUV or LCMS...
Publication date: Available online 16 November 2019Source: Journal of Health EconomicsAuthor(s): Dimitris Christelis, Dimitris Georgarakos, Anna Sanz-de-GaldeanoAbstractEconomic theory predicts that a reduction in background risk should induce financial risk-taking, particularly for individuals with low stock market participation costs. Hence, health insurance coverage could affect financial risk-taking by offsetting health-related background risk. We use a regression discontinuity design to examine whether Medicare eligibility at age 65 increases stockholding in the US and find that it does so for those with college educa...
In this study, serum IL6 was measured by ELISA, and the HSD11B1rs12086634(T/G) polymorphism was analyzed using a TaqMan allelic discrimination assay technique. There were statistically significant differences between the two studied groups concerning the serum IL-6 level and HSD11B1rs12086634(T/G) genotype distribution, with increased serum IL6 and increased frequencies of the GG and TG genotypes in patients with PCO. The GG genotype of HSD11B1 rs12086634(T/G) and its associated high level of serum IL-6 may represent genetic risk factors for PCOS.
Publication date: Available online 17 November 2019Source: European UrologyAuthor(s): Tom Marcelissen, Kevin Rademakers
Publication date: Available online 17 November 2019Source: European UrologyAuthor(s): Zhengzheng Xu, Guangzhe Ge, Bao Guan, Zhentao Lei, Xueyu Hao, Yuanyuan Zhou, Yue Shi, Huan Lu, Jilu Wang, Ding Peng, XiKang Wu, Huiying He, Bao Zhang, Xuesong Li, Liqun Zhou, Weimin Ci
Publication date: Available online 16 November 2019Source: European UrologyAuthor(s): Pirus Ghadjar, Thomas Wiegel
Publication date: Available online 16 November 2019Source: European UrologyAuthor(s): Elise De Bleser, Piet Ost
ConclusionThe CFQL-2 is a brief, reliable scale that effectively measures psychosocial aspects of QoL and is sensitive to changes in QoL in families of children with ASD or related neurodevelopmental disorders. Child externalizing behavior is strongly associated with reductions in multiple aspects of child and family psychosocial QoL.
ConclusionThis meta-analysis suggested a significant association between MTHFR gene polymorphism (C677T and A1298C) and ASD risk.
ConclusionGiven that obtaining negative margins is important in reducing the risk of recurrence, the method of surgical resection utilized is based on the amount of future functional residual hepatic parenchyma.
ConclusionsTattooing of axillary LNs is safe and easily performed. Tattooing was helpful in identifying the marked LN in the majority of cases. This technique helps to ensure that metastatic LNs are identified and removed at surgery after NAT.
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