Dielectric 1/f noise of proton glass on a hydrated protein surface.
From nonexponentiality of dielectric relaxation detected in hydrated lysozyme powder we evaluate the power spectrum x(2)(omega) of the fluctuating dipole moment X(2) of one macromolecule, due to the glass of protons migrating on the protein surface. Near room temperature, the contribution to the total dipole moment by the integrated strength of the 1/f(alpha) noise in the frequency range from 10(4) to 10(6) Hz, is well consistent with early Kirkwood's predictions in solution and more recent computations. The biochemical significance of the nonequilibrium region near the Vogel-Fulcher temperature T0 approximately 268 K calls for further investigations.
Careri
G
G
Dipartimento di Fisica, Università di Roma "La Sapienza," INFM Unità Roma Uno, 00185 Roma, Italy.
Consolini
G
G
D004563:Electrochemistry; D005898:Glass; D009113:Muramidase / Q000737:chemistry* / Q000378:metabolism*; D011522:Protons; D013696:Temperature; D014867:Water / Q000737:chemistry / Q000378:metabolism
D011522:Protons; D014867:Water; D009113:Muramidase