Diagnostic Absolute Configuration Determination of Clavulanate Potassium: A Comprehensive Investigation of Chiroptical Spectroscopies and Theoretical Calculations
Publication date: Available online 7 August 2018Source: Journal of Pharmaceutical and Biomedical AnalysisAuthor(s): Zhen Li, Linwei Li, Yi Zheng, Cong Chen, Tiemin SunAbstractClavulanate potassium (CP) is a classic β-lactamase inhibitor, which is extensively used as a combination drug in antibiotics therapy. As a chiral drug, CP is the only effective stereoisomer revealing prominent activities. To determine the chirality of CP efficiently, we provide an accurate and convenient method based on the comprehensive investigation of circular dichroism spectra and theoretical calculations. The results demonstrate two distinguishable cotton effects in electronic circular dichroism (ECD) and a sequence of cotton effect signs at specific wavenumbers in vibrational circular dichroism (VCD) can be regarded as diagnostic characteristics for the determination of absolute configuration. Additionally, the corresponding spectroscopic appearance of CP was elucidated with the help of theoretical analysis of molecular orbitals, natural bond orbitals and molecular electrostatic potential. The explicit absolute configuration determination of CP facilitates the thorough understanding in the stereochemistry of clavulanate potassium and its derivatives.Graphical abstract
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.