16,644 Result(s)
within
English
Biochemistry, general
Neurosciences
Yi** **
Article
-
Article
Bacterial chemotaxis in a two-dimensional attractant gradient
The motion of a population of chemotactic bacteria in a radial exponential gradient of attractant in a cylindrical container has been calculated using a mathematical model suggested by Keller and Segel. Numeri...
-
Article
Computer simulation of temperature regulation and feedback control as undergratuate physiology exercises
Two exercises illustrating the application of the quantitative techniques of physics to the understanding of biological processes have been developed and tested with undergraduate physiology classes. The first...
-
Article
Transformation of the viscoelastic functions of calcified tissues and interfacial biomaterials into a common representation
Since both connective and calcified tissues are markedly viscoelastic in nature, an understanding of the behavior of these tissues intrinsically as materials on their own, as well as in composite formation wit...
-
Article
Pulsed nuclear magnetic resonance studies in sickled erythrocytes
Pulsed proton magnetic resonance studies were made to determine T1 (spin-lattice) and T2 (spin-spin) relaxation times for normal and sickled blood cells in the oxygenated and deoxygenated states as a function of ...
-
Article
A review of the applications of solid state physics concepts to biological systems
The evidence for solid state physical processes in diverse biological systems is reviewed. Semiconduction of electrons across the enzyme particles as the rate-limiting process in cytochrome oxidase is evidence...
-
Article
Transmission of time varying magnetic field through body tissue
Based on the principles of interaction of electromagnetic waves with semi-infinite media, a simplified model is developed for the study of biological tissue — EM wave interaction problems. The four common type...
-
Article
II. An electrochemical model of the brain: Collective behaviour, irreversibility and information
Here the theory developed in a previous paper is applied to a many-neuron model representing the brain. It is shown that this model may exhibit quiet states in which it functions as a system of coupled harmoni...
-
Article
I. An electrochemical model of the brain: General theory and the single neuron
In order to give definite structure to a density matrix descriptive of informational processes, a brain model based on cell energetics is developed and tested against experimental data. Specifically, the creat...
-
Article
Self-consistent band theoretic models of DNA
Previously investigated models are further elaborated here, with particular application to DNA. Accepting the premise that DNA may be characterized as an intrinsic semiconductor with a band gap energy of appro...
-
Article
Adiabatic heating and membrane excitation
Excitable membranes can be induced to show an increase in conductivity such as that encountered in the “action potential.” We suggest that this transient condition may be the result of heating of the sites thr...
-
Article
Thermogravimetric analysis of human femur bone
Thermal decomposition analysis of human femur bone has been carried out in the temperature range between 25°C and about 1000°C. In this temperature range, the differential primary weight loss curve yielded fou...
-
Article
Rayleigh linewidths of laser light inelastically scattered from neural membranes
Laser light is scattered off the surface of nerve from the walking legs ofHomarus Americanus and the spectral power density of the Rayleigh line is obtained.
-
Article
An infrared spectroscopy study of the molecular structure changes of DNA after electron and ultraviolet irradiation
Samples of calf thymus DNA and two different leukemic leukocyte DNA's in the solid state have been irradiated (at 300°K) with 800 keV electrons and 4.9 eV (2537Å) ultraviolet rays. The subsequent effects on th...
-
Article
P. F. Verhulst's “notice sur la loi que la populations suit dans son accroissement” from correspondence mathematique et physique. Ghent, vol. X, 1838
The purpose of this publication as a pedagogical contribution is to report what is perhaps the first mathematical treatment of population statistics. This translation of an important paper by P. F. Verhulst wa...
-
Article
Electric field distribution in biological systems
-
Article
Molecular alterations produced in bacterial cells by ionizing radiation
Biochemical effects of high doses of 0.8 Mev electrons onEscherichia coli B were studied using infrared spectroscopy (IR). Aqueous suspensions of the bacterial cells were irradiated in open petri dishes. After ex...
-
Article
What is being done in biological physics in the United Kingdom
In an earlier issue of this journal (Volume 1, number 2) we outlined current research projects and graduate training programs in American universities. This article is similar in that it includes relevant data...
-
Article
The opiate receptors
-
Article
The effect of methionine on the uptake, distribution, and binding of the convulsant methionine sulfoximine in the rat
The effect of methionine on the uptake, distribution, and binding of the convulsant methionine sulfoximine (MSO) in 7 rat brain regions, the spinal cord, the liver, and the kidney was investigated. The adminis...
-
Article
Resolution and reconstitution of glutamate decarboxylase from cerebellum
Brain glutamate decraboxylase (EC 4.1.1.15) catalyzes the biosynthesis of the postulated neurotransmitterγ-aminobutyric acid according to the following chemical equation:L-glutamate →γ-aminobutyric acid+CO2. Hydr...
