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백선종,김승용,김태만,김현식 사단법인 한국질량분석학회 2013 Mass spectrometry letters Vol.4 No.4
We performed computer simulations to improve transmission efficiencies of a dual ion funnel system implemented onan FT-ICR MS. We found that the low m/z range from 50 to 150 could be significantly improved by operating the two ion funnelsat different RF amplitudes. These new operational conditions could be applied to analyze metabolome samples, whichrequire high sensitivity in the m/z range from 50 to 1,000.
Photodissociation Dynamics of$H_2O_2$ at 280-290 nm
백선종,신승근,박찬량,김홍래,Baek, Seon Jong,Sin, Seung Geun,Park, Chan Ryang,Kim, Hong Rae Korean Chemical Society 1995 Bulletin of the Korean Chemical Society Vol.16 No.3
Laser induced fluorescence spectra of OH produced from photodissociation of $H_2O_2$ at 280-290 nm in the gas phase have been observed. By analyzing the Doppler profiles, the anisotropy parameter($\beta$ =-0.7) and the center of mass translational energy of the fragments have been measured. The measured energy distribution is well described by an impulsive model. The excited state leading to dissociation is found to be of 1Au symmetry. The dissociation from this state is prompt and direct with the fragment OH rotating in the plane perpendicular to the O-O bond axis.
최치원,안혜영,이용주,이열권,윤성호,박창균,홍연혜,김건화,박재은,백선종,김현식,김성일 한국미생물학회 2013 The journal of microbiology Vol.51 No.5
The identification of novel diagnostic markers of pathogenic bacteria is essential for improving the accuracy of diagnoses and for developing targeted vaccines. Streptococcus pneumoniae is a significant human pathogenic bacterium that causes pneumonia. N-acetylglucosamine-6-phosphate deacetylase (NagA) was identified in a protein mixture secreted by S. pneumoniae and its strong immunogenicity was confirmed in an immuno-proteomic assay against the anti-serum of the secreted protein mixture. In this study, recombinant S. pneumoniae NagA protein was expressed and purified to analyze its protein characteristics, immunospecificity, and immunogenicity, thereby facilitating its evaluation as a novel diagnostic marker for S. pneumoniae. Mass spectrometry analysis showed that S. pneumoniae NagA contains four internal disulfide bonds and that it does not undergo posttranslational modification. S. pneumoniae NagA antibodies successfully detected NagA from different S. pneumoniae strains, whereas NagA from other pathogenic bacteria species was not detected. In addition, mice infected with S. pneumoniae generated NagA antibodies in an effective manner. These results suggest that NagA has potential as a novel diagnostic marker for S. pneumoniae because of its high immunogenicity and immunospecificity.