Theoretical and experimental studies of CIDNP kinetics in recombination of radical pairs by the method of switched external magnetic field. I. Theory

1997 ◽  
Vol 107 (23) ◽  
pp. 9942-9953 ◽  
Author(s):  
Andrei Parnachev ◽  
Peter Purtov ◽  
Elena Bagryanskaya ◽  
Renad Sagdeev
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Experimental Studies ◽  
Radical Pairs

scholarly journals Can disordered radical pair systems provide a basis for a magnetic compass in animals?

2009 ◽  
Vol 7 (suppl_2) ◽  
Author(s):  
Erin Hill ◽  
Thorsten Ritz
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Radical Pair ◽  
Magnetic Compass ◽  
Magnetic Field Direction ◽  
Chemical Signal ◽  
Radical Pairs ◽  
Directional Information ◽  
Minimum Number ◽  
Signal Production

A proposed mechanism for magnetic compasses in animals is that systems of radical pairs transduce magnetic field information to the nervous system. One can show that perfectly ordered arrays of radical pairs are sensitive to the direction of the external magnetic field and can thus operate, in principle, as a magnetic compass. Here, we investigate how disorder, inherent in biological cells, affects the ability of radical pair systems to provide directional information. We consider biologically inspired geometrical arrangements of ensembles of radical pairs with increasing amounts of disorder and calculate the effect of changing the direction of the external magnetic field on the rate of chemical signal production by radical pair systems. Using a previously established signal transduction model, we estimate the minimum number of receptors necessary to allow for detection of the change in chemical signal owing to changes in magnetic field direction. We quantify the required increase in the number of receptors to compensate for the signal attenuation through increased disorder. We find radical-pair-based compass systems to be relatively robust against disorder, suggesting several scenarios as to how a compass structure can be realized in a biological cell.

External magnetic field dependent influence of lanthanide ions on the chemistry of radical pairs in micelles

1985 ◽  
Vol 120 (4-5) ◽  
pp. 397-400 ◽  
Author(s):  
Nicholas J. Turro ◽  
Xuegong Lei ◽  
Ian R. Gould ◽  
Matthew B. Zimmt
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Lanthanide Ions ◽  
Radical Pairs ◽  
Field Dependent

An Investigation of the Behaviour of Magnetorheological Fluids in the Rotary Shock-Absorber

2012 ◽  
Vol 628 ◽  
pp. 512-517 ◽  
Author(s):  
Sławomir Kciuk ◽  
Monika Kciuk ◽  
Roman Turczyn ◽  
Paweł Martynowicz
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Structure Formation ◽  
Internal Structure ◽  
Carbonyl Iron ◽  
Shock Absorber ◽  
Experimental Studies ◽  
Magnetorheological Fluids ◽  
Control Current

The main aim of the article was to present the investigation results of created megnetorheological fluids using carbonyl iron (CI) particles and analyse their behaviour in terms of the internal structure formation by a control of external magnetic field. Results of the experimental studies of a prototype magnetorheological rotary shock-absorber at various magnitudes of control current was presented in this paper.

External magnetic field effects upon chemical reactions of quasi-stable radical pairs in an SDS micelle

1993 ◽  
Vol 203 (5-6) ◽  
pp. 482-486 ◽  
Author(s):  
Hisao Murai ◽  
Natsuo Ishiwata ◽  
Keiji Kuwata ◽  
Yoshio Sakaguchi ◽  
Hisaharu Hayashi
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Chemical Reactions ◽  
Stable Radical ◽  
Magnetic Field Effects ◽  
Radical Pairs ◽  
Field Effects ◽  
Sds Micelle

Alternating Magnetic Field Responses of Magnetic Fluid Drop Adsorbed to a Small Permanent Magnet

2012 ◽  
Vol 721 ◽  
pp. 102-107 ◽  
Author(s):  
Seiichi Sudo ◽  
Daisaku Asano ◽  
Hidemasa Takana ◽  
Hideya Nishiyama
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Permanent Magnet ◽  
Magnetic Fluid ◽  
High Speed ◽  
Experimental Studies ◽  
Video Camera ◽  
Alternating Magnetic Field ◽  
Camera System ◽  
Fluid Drop

Experimental studies of the behavior of magnetic fluid drop under the effect of an external alternating magnetic field were performed using a high speed digital video camera system. A small permanent magnet was immersed in magnetic fluid drop, and it was fixed with an aluminum bar. The surface of magnetic fluid responded to the external magnetic field sensitively. The free surface of the magnetic fluid drop responded to the external alternating field in elongation and contraction along the direction of the field. The capillary magnetic fluid jet was produced at the certain external magnetic field condition.

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