Search

Your search keyword '"Kang, Xiong"' showing total 2 results
2 results on '"Kang, Xiong"'

1. Undirected Structural Markov Property for Bayesian Model Determination.

Author

Kang, Xiong, Hu, Yingying, and Sun, Yi

Subjects
*UNDIRECTED graphs, *BAYESIAN field theory, *ALGORITHMS, *PROBABILITY theory
Abstract

This paper generalizes the structural Markov properties for undirected decomposable graphs to arbitrary ones. This helps us to exploit the conditional independence properties of joint prior laws to analyze and compare multiple graphical structures, while being able to take advantage of the common conditional independence constraints. This work provides a theoretical support for full Bayesian posterior updating about the structure of a graph using data from a certain distribution. We further investigate the ratio of graph law so as to simplify the acceptance probability of the Metropolis–Hastings sampling algorithms. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

2. Sodium Perchlorate Effects on the Helical Stability of a Mainly Alanine Peptide

Author

Sanford A. Asher, Eliana K. Asciutto, Kang Xiong, Ignacio J. General, and Jeffry D. Madura

Subjects
Circular dichroism, Inorganic chemistry, Biophysics, Peptide, 02 engineering and technology, 010402 general chemistry, Sodium perchlorate, 01 natural sciences, Protein Structure, Secondary, chemistry.chemical_compound, Molecular dynamics, Protein structure, Computational chemistry, chemistry.chemical_classification, Alanine, Ions, Perchlorates, Protein Stability, Circular Dichroism, Solvation, Temperature, Water, 021001 nanoscience & nanotechnology, Sodium Compounds, Biological Systems and Multicellular Dynamics, 0104 chemical sciences, chemistry, Models, Chemical, Osmolyte, 0210 nano-technology, Peptides, Algorithms
Abstract

Sodium perchlorate salt (NaClO(4)) is commonly used as an internal intensity standard in ultraviolet resonance Raman (UVRR) spectroscopy experiments. It is well known that NaClO(4) can have profound effects on peptide stability. The impact of NaClO(4) on protein stability in UVRR experiments has not yet been fully investigated. It is well known from experiment that protein stability is strongly affected by the solution composition (water, salts, osmolytes, etc.). Therefore, it is of the utmost importance to understand the physical basis on which the presence of salts and osmolytes in the solution impact protein structure and stability. The aim of this study is to investigate the effects of NaClO(4), on the helical stability of an alanine peptide in water. Based upon replica-exchange molecular dynamics data, it was found that NaClO(4) solution strongly stabilizes the helical state and that the number of pure helical conformations found at room temperature is greater than in pure water. A thorough investigation of the anion effects on the first and second solvation shells of the peptide, along with the Kirkwood-Buff theory for solutions, allows us to explain the physical mechanisms involved in the observed specific ion effects. A direct mechanism was found in which ClO(4)(-) ions are strongly attracted to the folded backbone.

Published
2010
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results