Quantum mechanical aspects of the effects of weak magnetic fields on biological objects

BIOPHYSICS ◽  
2010 ◽  
Vol 55 (4) ◽  
pp. 652-660 ◽  
Author(s):  
A. V. Drozdov ◽  
T. P. Nagorskaya ◽  
S. V. Masyukevich ◽  
E. S. Gorshkov
Keyword(s):  
Magnetic Fields ◽  
Quantum Mechanical ◽  
Biological Objects ◽  
Weak Magnetic Fields

ON THE QUANTUM MECHANICAL GENERALIZATION OF BLOCH'S TRANSPORT EQUATION

1963 ◽  
Vol 41 (3) ◽  
pp. 533-544 ◽  
Author(s):  
J. Hajdu
Keyword(s):  
Asymptotic Behavior ◽  
Steady State ◽  
Kinetic Equation ◽  
Magnetic Fields ◽  
Transport Equation ◽  
Density Operator ◽  
Quantum Mechanical ◽  
Simple Derivation ◽  
Asymptotic Equation ◽  
Weak Magnetic Fields

A simple derivation is given of a kinetic equation for a system of free electrons moving in uniform electric and magnetic fields, and interacting with fixed scattered. The kinetic equation describes the asymptotic behavior of the single-electron density operator if it approaches a steady value, or the asymptotic behavior of its average over oscillations if the density operator oscillates in time. This equation, which is effectively the quantum mechanical generalization of Bloch's transport equation, is identical with the one recently derived by Kosevich and Andreev using Bogolyubov's method. More general considerations show that this asymptotic equation is valid, and describes the approach to the steady state for weak magnetic fields when the relaxation time is much longer than the atomic time. For strong magnetic fields, the same statement holds if the density operator is averaged over its oscillations, whereas the unaveraged approach towards the steady state is governed by a somewhat different equation. The solutions of these two equations become identical in the most important limiting cases. The results obtained previously by different authors follow from the kinetic equation when further assumptions are introduced.

Tuning the Magnetic Alignment of Cellulose Nanocrystals from Perpendicular to Parallel Using Lepidocrocite Nanoparticles

2019 ◽  
Author(s):  
Valentina Guccini ◽  
Sugam Kumar ◽  
Yulia Trushkina ◽  
Gergely Nagy ◽  
Christina Schütz ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Cellulose Nanocrystals ◽  
Small Angle Neutron Scattering ◽  
Lower Amount ◽  
Magnetic Alignment ◽  
Polarized Optical Microscopy ◽  
Parallel Orientation ◽  
Weak Magnetic Fields

The magnetic alignment of cellulose nanocrystals (CNC) and lepidocrocite nanorods (LpN), pristine and in hybrid suspensions has been investigated using contrast-matched small-angle neutron scattering (SANS) under in situ magnetic fields (0 – 6.8 T) and polarized optical microscopy. The pristine CNC (diamagnetic) and pristine LpN (paramagnetic) align perpendicular and parallel to the direction of field, respectively. The alignment of both the nanoparticles in their hybrid suspensions depends on the relative amount of the two components (CNC and LpN) and strength of the applied magnetic field. In the presence of 10 wt% LpN and fields < 1.0 T, the CNC align parallel to the field. In the hybrid containing lower amount of LpN (1 wt%), the ordering of CNC is partially frustrated in all range of magnetic field. At the same time, the LpN shows both perpendicular and parallel orientation, in the presence of CNC. This study highlights that the natural perpendicular ordering of CNC can be switched to parallel by weak magnetic fields and the incorporation of paramagnetic nanoparticle as LpN, as well it gives a method to influence the orientation of LpN.<br>

A System for Exposing Biological Objects to Variable Combinations of Electric and Magnetic Fields

1986 ◽  
Vol 5 (2) ◽  
pp. 171-185
Author(s):  
K. Saali ◽  
J. Juutilainen ◽  
T. Lahtinen
Keyword(s):  
Magnetic Fields ◽  
Biological Objects ◽  
Electric And Magnetic Fields

Dynamical mass generation in QED with weak magnetic fields

2006 ◽  
Author(s):  
A. Ayala ◽  
A. Bashir ◽  
A. Raya ◽  
E. Rojas
Keyword(s):  
Magnetic Fields ◽  
Mass Generation ◽  
Dynamical Mass ◽  
Weak Magnetic Fields ◽  
Dynamical Mass Generation

scholarly journals Sensitivity of PS/CoPd Janus particles to an external magnetic field

RSC Advances ◽  
2021 ◽  
Vol 11 (28) ◽  
pp. 17051-17057
Author(s):  
Anna Eichler-Volf ◽  
Yara Alsaadawi ◽  
Fernando Vazquez Luna ◽  
Qaiser Ali Khan ◽  
Simon Stierle ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
External Magnetic Field ◽  
Magnetic Fields ◽  
Janus Particles ◽  
Weak Magnetic Fields

PS/CoPd Janus particles respond very sensitively to application of low external magnetic fields. Owing to the magnetic properties, the PS/CoPd particles may be used, for example, to sense the presence of weak magnetic fields as micro-magnetometers.

Off-diagonal magnetoimpedance in amorphous wires and its application in miniature sensors of weak magnetic fields

2014 ◽  
Vol 78 (11) ◽  
pp. 1169-1173 ◽  
Author(s):  
N. A. Yudanov ◽  
A. A. Rudyonok ◽  
L. V. Panina ◽  
A. T. Morchenko ◽  
A. V. Kolesnikov ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Amorphous Wires ◽  
Weak Magnetic Fields

scholarly journals Superconducting transition of a two-dimensional Josephson junction array in weak magnetic fields

2005 ◽  
Vol 72 (14) ◽  
Author(s):  
In-Cheol Baek ◽  
Young-Je Yun ◽  
Jeong-Il Lee ◽  
Mu-Yong Choi
Keyword(s):  
Magnetic Fields ◽  
Josephson Junction ◽  
Two Dimensional ◽  
Superconducting Transition ◽  
Weak Magnetic Fields ◽  
Josephson Junction Array ◽  
Junction Array

Effects of weak magnetic fields on free radical recombination reactions

1998 ◽  
Vol 95 (1) ◽  
pp. 71-89 ◽  
Author(s):  
C.R. Timmel ◽  
U. Till ◽  
B. Brocklehurst ◽  
K.A. Mclauchlan ◽  
P.J. Hore
Keyword(s):  
Free Radical ◽  
Magnetic Fields ◽  
Radical Recombination ◽  
Weak Magnetic Fields ◽  
Recombination Reactions

Endless skies and open seas – how birds and fish navigate

Neuroforum ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Lisa Spiecker ◽  
Bo Leberecht ◽  
Corinna Langebrake ◽  
Malien Laurien ◽  
Shambhavi Rajendra Apte ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Magnetic Fields ◽  
Home Range ◽  
Environmental Conditions ◽  
Geomagnetic Field ◽  
Visual Cues ◽  
Quantum Mechanical ◽  
The Sun ◽  
Seasonal Migrations ◽  
Research Questions

Abstract Every year, billions of animals leave their home range and start seasonal migrations in order to find more favorable resources and to escape harsh environmental conditions. These round trips often span thousands of kilometers. To successfully navigate along their route, animals rely on various external references. While landmarks and celestial cues like stars or the sun are easy to imagine as guidance on these journeys, using the geomagnetic field for orientation is more elusive. The geomagnetic field is an omnipresent cue, which can be sensed and relied upon by many animals, even when visual cues are sparse. How magnetic fields can be perceived seems to vary between birds and fish. While birds seem to use a mechanism based on the quantum mechanical properties of electron spins, fish may have evolved a compass similar in its function to the technical devises developed by humans. How these mechanisms work precisely and how they are integrated are research questions addressed in SFB 1372.

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