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In this work, we demonstrated that calcium (Ca+2) is able to induce a conformational change in trans-dehydroandrosterone (DHEA). To this respect, solid-state NMR spectroscopy was applied to a series of DHEA molecules that were incubated with Ca+2 under different concentrations. The high-resolution 13C NMR spectra of the DHEA/Ca+2 mixtures exhibited two distinct sets of signals; one was attributed...
In this paper, we propose a new criterion, named PICa, to simultaneously select explanatory variables in the mean model and variance model in heteroscedastic linear models based on the model structure. We show that the new criterion can select the true mean model and a correct variance model with probability tending to 1 under mild conditions. Simulation studies and a real example are presented to...
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