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Article
Breath-hold diving: a point of view
Professor Piergiorgio Data, who passed away in September 2005, was a professor of physiology and of diving and hyperbaric medicine. The Diving and Subaquatic Activities Postgraduate Course of the Medical Schoo...
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Article
Open AccessSignal transduction events induced by extracellular guanosine 5′triphosphate in excitable cells
A better understanding of the physiological effects of guanosine-based purines should help clarify the complex subject of purinergic signalling. We studied the effect of extracellular guanosine 5′triphosphate ...
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Article
Sarcopenia: characteristics, genesis, remedies
The term sarcopenia is defined as the loss of mass and muscular function with age. It is characterized by a metabolic status in which the muscles present a reduced ability to produce and use energy. Thus, in h...
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Article
Sodium nitroprusside, a NO donor, modifies Ca2+ transport and mechanical properties in frog skeletal muscle
Recently it has been hypothesized that, in skeletal muscle, NO produced directly by high-frequency stimulation could produce contraction through reactions with thiol groups on the sarcoplasmic reticulum (SR). ...
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Article
Abstract
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Article
S-100ab increases Ca2+ release in purified sarcoplasmic reticulum vesicles of frog skeletal muscle
The S-100ab protein, a mixed isoform member of the S-100 family, stimulates Ca2+-induced Ca2+-release from sarcoplasmic reticulum vesicles purified from frog skeletal muscle cells. The effects of S-100ab appear t...
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Article
An elementary Hubbard Hamiltonian and the representability problem
Two finite size Hubbard models in two dimensions are considered at half filling: a 2×2 square lattice and a 4×4 square lattice, both with periodic boundary conditions. In the elementary case of the 2×2 lattice...
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Article
Functional aspects of calcium transport in sarcoplasmic reticulum vesicles derived from frog skeletal muscle treated with saponin
To study the physiological aspects of the excitation-contraction cycle, saponin (10–100Μg ml−1) was used as a skinning agent on muscle and sarcotubular vesicles derived from fast muscles (sartorius and tibialis a...
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Article
Finite-size calculations of FQHE states at filling ν=1/2
We present the results of numerical calculations, performed in the spherical geometry, of FQHE states ofN≤12 electrons in the lowest Landau level at filling ν=1/2. The extrapolated value for the energy per partic...
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Article
On the evaluation of molecular one-electron properties from perturbative-variational wave functions with a multidimensional CI reference space
An algorithm has been implemented for the evaluation of one-electron density matrices from correlated wave functions obtained by using a variation-perturbation procedure recently proposed, which allows the inc...
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Article
Static response to a charge impurity near a metal surface finite-barrier treatment
The static response to a charge impurity near a metal surface is computed in the RPA approximation for the case of a finite barrier. Particular attention is given to the problem of the correct infinite-volume ...
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Article
Use of the local harmonic approximation in the theory of radiationless transitions
The possibility of applying the «local harmonic approximation» to the calculation of the generating functions used in the theory of radiationless transitions has been investigated. The approximation attempts t...
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Article
The higher-order fast CI
The fast CI method is extended in order to account for the effect of triply and quadruply excited configurations.
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Article
A variational method for second-order properties in atoms and molecules
Second-order properties are computed by diagonalizing a perturbed Hamiltonian in a three-dimensional linear spaceL. The choice of the basis vectors generatingL is suggested by the coupled perturbed Hartree-Fock (...
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Article
Functional integration and theS energy levels of a three-body system
A method for finding the spherically symmetric energy levels of a three-body system is presented. IfH=T+V denotes a three-body Hamiltonian, we use Trotter's formula in order to compute the density matrix exp [−βH
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Article
Local harmonic approximation in quantum statistical mechanics
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Article
On the Hartree-Fock time-dependent problem
A previous result is generalized. An existence and uniqueness theorem is proved for the Hartree-Fock time-dependent problem in the case of a finite Fermi system interacting via a two body potential, which is s...
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Article
Functional-integration methods for the Schrödinger equation
A method for computing eigenvalues and eigenvectors of the Schrödinger equation is presented. The method consists in a numerical approximation to the path integral combined with the moment method. An estimate ...
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Article
An existence proof for the Hartree-Fock time-dependent problem with bounded two-body interaction
Using fixed point theorems for local contractions in Banach spaces, an existence and uniqueness proof for the Hartree-Fock time-dependent problem is given in the case of a finite Fermi system interacting via a...
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Article
On a limiting procedure for obtaining physical states for an infinite Fermi system
We propose a limiting procedure for obtaining physical states for an infinite non-relativistic Fermi system. We take the thermodynamic limit of vector states in the Fock representation of the C.A.R. algebra, r...
