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Biochemistry, general
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Article
Biophysical aspects of dielectrophoresis
Dielectrophoresis, the translational motion produced by the action of a nonuniform electric field upon neutral polarizable bodies, is proving useful in handling biological systems. It is especially useful in s...
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DNA repair efficiency for ultraviolet induced damage
Ultraviolet radiation causes lesions in bacterial DNA which are repaired by several enzyme systems. Wide variations in the efficiency of repair for differentE. Coli strains are inadequately explained by a simple ...
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Ion transport through thin lipid films
Currents through thin lipid films were measured versus temperature, applied voltage, pH value, ionic strength and ionic species. All experimental data tend to fit a two-component current theory, that is, the f...
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On the applicability of ising and other statistical models to phase transition in biomembranes
The current literature is critically examined as regards to the applicability of statistical mechanics to the dipole model in order to describe phase transition in biological membranes. The numerical calculati...
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Electrical capacitances of thin lipid films
Based on the considerations of surface charge and surface recombination (or ion binding), the capacitances of the diffused double layer and the polar region are calculated as functions of ionic strength, pH va...
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What is “Biological Physics”? A resource letter
The purpose of this resource letter is threefold: To attempt a refinement of the tenuous definition of the term “Biological Physics”. To do this via a compendium, albeit inexhaustive and incomplete, of materia...
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Electrical measurements in epithelial tissues: Theory and practice
The transport of ions from one side to the other of the continuous sheet of cells that constitutes an epithelium is most easily explored with the chambered preparation, in which the tissue is maintained betwee...
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The theory of impedance in biological systems
The basic relations of impedance as they pertain to biological systems is slowly varying electric fields are developed. One of the boundary conditions for the quasi-steady state is derived in terms of impedanc...
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Comparing the efficiency of sensory systems: A biophysical approach
This article is an exposition of the view that the complexity of biological systems permitsintensive (as opposed toextensive) research on any level. Specifically, (i) new views onstructural information theory use...
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Microwave Hall effect measurements in biomacromolecular systems
Microwave Hall effect measurements have recently been applied to the study of the electronic properties of biological materials. A basic outline of the relevance of the Hall effect for such biological studies ...
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Approximate bandwidths for π and σ energy states in poly (dA.dT)
Using energy levels of the π and σ orbitals for adenine and thymine obtained by the CNDO method, the widths of those levels for poly (dA · dT) are calculated approximately. The results indicate that the bands are...
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Electron transfer mechanisms in electron transfer chains
Mechanisms responsible for the transfer of electrons through mitochondrial and photosynthetic electron transport chains are considered. Mechanisms considered include diffusion, ligand-mediated transfer, tunnel...
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Hydrodynamic shearing of biological cells
An understanding of hydrodynamic shearing of biological cells provides basic information about the mechanical properties of cells, their deformations occurring in natural circulations and is necessary for effe...
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Low angle x-ray diffraction and biology
The use of the low-angle x-ray diffraction method in biology is described. Some x-ray diffraction patterns have been known since the early 1930's but, in the last decade, many new patterns, which show more ref...
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Leonhardi Euleri's “Principia pro motu sanguinis per arterias determinando”
The purpose of this publication as a pedagogical contribution is to illustrate the uniqueness of the method Euler used to determine the unsteady flow of blood in the circulatory system. In his presentation, he...
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Electric field distribution in biological systems
Electric field distribution in biological systems was investigated. In the analysis both the conductive and the dielectric properties of biological systems were considered. Making use of the complex dielectric...
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Surface dipoles, surface charges and negative steady-state resistance in biological membranes
A theoretical expression for the steady-state current-voltage characteristic of biological membranes is given, justifying various assumptions which are usually made in the framework of the electrodiffusion the...
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Properties of membrane stationary states. 2. The isobaric isothermal ensemble
A multi-state membrane transport system serves as the basic model for a comparison of equilibrium and stationary state distributions of ions within an ensemble of membrane channels. Transition probabilities fo...
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Quasi one-dimensional electronic conduction and nomadic polarization in polymers
The molecular semiconductors exhibit a wide range of electronic properties not necessarily shown by conventional covalent or ionic semiconductors. Study of the conductive organic solids, particularly the polym...
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Biological effects of ultrasound
When ultrasound is absorbed by tissue, heat is produced which may be destructive or, if controlled, can be therapeutic. In addition, ultrasound produces biological effects which cannot be explained on the basi...
