Single vibronic level fluorescence emission spectroscopy and radiative lifetimes of H2CO(?1A2):40 and 41

1978 ◽  
Vol 69 (2) ◽  
pp. 751-757 ◽  
Author(s):  
Kazuhiko Shibuya ◽  
Robert A. Harger ◽  
Edward K. C. Lee
Keyword(s):  
Emission Spectroscopy ◽  
Fluorescence Emission ◽  
Radiative Lifetimes ◽  
Fluorescence Emission Spectroscopy ◽  
Vibronic Level

Experimental methods in chemical engineering: Fluorescence emission spectroscopy

2019 ◽  
Vol 97 (8) ◽  
pp. 2168-2175 ◽  
Author(s):  
Anderson J. Gomes ◽  
Claure N. Lunardi ◽  
Fellipy S. Rocha ◽  
Gregory S. Patience
Keyword(s):  
Emission Spectroscopy ◽  
Chemical Engineering ◽  
Fluorescence Emission ◽  
Experimental Methods ◽  
Fluorescence Emission Spectroscopy

scholarly journals Variable Region Identical Immunoglobulins Differing in Isotype Express Different Paratopes

2012 ◽  
Vol 287 (42) ◽  
pp. 35409-35417 ◽  
Author(s):  
Alena Janda ◽  
Ertan Eryilmaz ◽  
Antonio Nakouzi ◽  
David Cowburn ◽  
Arturo Casadevall
Keyword(s):  
Emission Spectroscopy ◽  
Fluorescence Emission ◽  
Variable Region ◽  
Vaccine Responses ◽  
Fluorescence Emission Spectroscopy ◽  
Novel Approach ◽  
Conformational Constraints ◽  
Label Peptide ◽  
Immunological Effects ◽  
V Region

The finding that the antibody (Ab) constant (C) region can influence fine specificity suggests that isotype switching contributes to the generation of Ab diversity and idiotype restriction. Despite the centrality of this observation for diverse immunological effects such as vaccine responses, isotype-restricted antibody responses, and the origin of primary and secondary responses, the molecular mechanism(s) responsible for this phenomenon are not understood. In this study, we have taken a novel approach to the problem by probing the paratope with 15N label peptide mimetics followed by NMR spectroscopy and fluorescence emission spectroscopy. Specifically, we have explored the hypothesis that the C region imposes conformational constraints on the variable (V) region to affect paratope structure in a V region identical IgG1, IgG2a, IgG2b, and IgG3 mAbs. The results reveal isotype-related differences in fluorescence emission spectroscopy and temperature-related differences in binding and cleavage of a peptide mimetic. We conclude that the C region can modify the V region structure to alter the Ab paratope, thus providing an explanation for how isotype can affect Ab specificity.

scholarly journals Exploring the Interfacial Phase and π–π Stacking in Aligned Carbon Nanotube/Polyimide Nanocomposites

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1158
Author(s):  
Qian Jiang ◽  
Qian Zhang ◽  
Xianyan Wu ◽  
Liwei Wu ◽  
Jia-Horng Lin
Keyword(s):  
Carbon Nanotube ◽  
Conjugated Polymer ◽  
Emission Spectroscopy ◽  
Fluorescence Emission ◽  
Interfacial Microstructure ◽  
Phase System ◽  
X Ray Diffraction ◽  
X Ray ◽  
Π Stacking ◽  
Fluorescence Emission Spectroscopy

To characterize the interfacial microstructure and interaction at a nanoscale has a significant meaning for the interface improvement of the nanocomposites. In this study, the interfacial microstructure and features of aligned multiwalled carbon nanotube (MWNT) and conjugated polymer polyimide (PI) with three molecular structures were investigated using small-angle X-ray scattering (SAXS), wide-angle X-ray diffraction (WAXD), and fluorescence emission spectroscopy. It was found that aligned MWNT/PI nanocomposites had a nonideal two-phase system with the interfaces belonging to long period stacking ordered structure. Attributed to the π–π stacking effect, MWNT/BTDA-MPD presented the most regular arrangement verified by fractal dimension. By adopting a one-dimension correlation function, each phase dimension in aligned MWNT/PI nanocomposites was calculated and verified by high resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD). The π–π stacking was demonstrated to be an important interaction between MWNT and PI via WAXD and fluorescence emission spectroscopy, and it was influenced by the linkage bond between benzene rings in PIs. This work is of significance to reveal the interfacial features between conjugated polymer and carbon nanotubes (CNTs), which is favorable for the interface design of CNT-based high performance nanocomposites.

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