Physics of Biology

0909 Submissions

[2] viXra:0909.0053 [pdf] submitted on 28 Sep 2009

Electro Mechanical Contributions to Low Frequency Dielectric Responses of Biological Cells in Colloidal Suspension

Authors: Andrew Beckwith
Comments: 18 pages. Part of a different analogy to bio phyics dielectric constants explored by the author with Dr. Patrick Xie and Dr. James Claycomb at the Texas center for super conductivity, Houston, Texas, in early 2002.

We investigate electro-mechanical contributions to the low frequency dielectric response of biological cells in colloidal suspension. Prior simulations of biological cells in colloidal suspension yield maximum dielectric constant values about 103 in magnitude as the frequency of applied electric fields drops below the kHz range. Experimentally measured relative dielectric values in yeast cells , on the other hand, have maximal values up to 107 - 108 . We consider both electrical and mechanical energy stored in cellular suspension and show that low frequency mechanical contributions can give rise to dielectric constant values of this magnitude.
Category: Physics of Biology

[1] viXra:0909.0019 [pdf] submitted on 6 Sep 2009

Photorefractive Protein Bacteriorhodopsin, BR , as a Material for Holographic Data-Recording

Authors: Rafael-Andrés Alemañ-Berenguer, María Gomariz
Comments: 7 pages

The search of materials of biological origin with specific estates of potential technologic applications whose structure and functions come out from a process of adaptive evolution experienced by the organisms in extreme environments, is one of the most active fields in the modern biophysics. In short, the protein bacteriorhodopsin, acts like a protonic bomb whose photocycle has demonstrated interesting implications in the technologies of optic storage of information by means of holographic methods. In the present work some results of the investigation undertaken by our group are exposed, consistent mainly in the study of the influence that working conditions (pH, state of aggregation of the environment, intensity and time of illumination, etc.) have over photophysical and photochemical states of bacteriorhodopsin as well as in the tracking of the possible presence of bacteriorhodopsin proteins and xantorhodopsin, in the salines of Santa Pola (Alicante, Spain).
Category: Physics of Biology