Biomedical Instrumentation Systems
1st Edition
ISBN: 9781133478294
Author: Chatterjee
Publisher: Cengage
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What is the main particularity of a MS signal for a molecule having:
An enriched level of 13C atoms (up to 50/50 12C/13C)?
a. If two signals differ by 1.5 ppm in a 300 MHz spectrometer, by how much do they differ in a 500 MHz spectrometer?
b. If two signals differ by 90 Hz in a 300 MHz spectrometer, by how much do they differ in a 500 MHz spectrometer?
On what does the strength of MRI signal depend on? i.e. can we increase it or control it?
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- What is the chemical shift in ppm of a carbon that resonates at 1325 Hz on a 250 MHz instrument (Answer is not 5.3 ppm)?arrow_forwardDraw block diagram of IR spectrophotometer and describe the basic components.arrow_forwardWhy does fluorescence tend to be the mirror image of absorption?arrow_forward
- A)What absorbance value corresponds to 80% transmittance? B)What is the new % transmittance value if the absorbance value in A increases by 0.250?arrow_forwardWhat absorbance corresponds to 1% transmittance? To 50% transmittance?arrow_forwardIf two signals differ by 90 Hz in a 300 MHz spectrometer, by how much do they differ in a 500 MHzspectrometer?arrow_forward
- What is the main particularity of a MS signal for a molecule having: a: Cl atom? b: A Br atom? c: An odd number of nitrogen atoms? d: An enriched level of 13C atoms (up to 50/50 12C/13C)? e: An adduct with sodium?arrow_forwardThe absorbance of sample A is higher than the absorbance of sample B. Therefore, sample A has (circle the correct one) more / less dissolved solute than sample B. The absorbance is (circle the correct one) directly / inversely related to the transmittance of a sample.arrow_forward
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