Answered: What is the difference between…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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What is the difference between functional magnetic resonance, electron paramagnetic resonance and nuclear paramagnetic resonance?

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a) Functional magnetic resonance (fMRI):

Functional magnetic resonance (fMRI)	Electron paramagnetic resonance (EPR)/Electron spin resonance (ESR)	Nuclear paramagnetic resonance (NMR)
It works on the principle that uses magnetic properties of hemoglobin and create the images of changes in cortical blood flow	It uses the microwave radiations to probe species with unpaired electrons like radicals, radical cations, triplets in presence of external static magnetic field	It uses the interaction of radiofrequency (rf) electromagnetic radiations with the nuclei of molecules in presence of strong magnetic field
Relaxation time units vary from milliseconds to seconds	Relaxation time units vary from nanoseconds to microseconds	Relaxation time units vary from milliseconds to seconds
Uses strong magnetic field i.e 1.5 T or higher. The frequency and magnetic field ratio i.e Gyromagnetic ratio is 43 MHz/Tesla	The frequency and magnetic field ratio i.e Gyromagnetic ratio is 28 GHz/Tesla	The frequency and magnetic field ratio i.e Gyromagnetic ratio is 42.5 MHz/Tesla
It does not use any radiations	It uses microwave radiations i.e 1000 MHz to 300000 MHz	It uses radiofrequency wave radiation i.e 100 MHz to 800 MHz

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