Biochemistry 410/411 Textbook - 5th Edition - Custom Texas A&M University
Biochemistry 410/411 Textbook - 5th Edition - Custom Texas A&M University
5th Edition
ISBN: 9781119302940
Author: Voet
Publisher: WILEY C
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Chapter 13, Problem 3E

(a)

Summary Introduction

To explain: The biochemical changes that are required to convert tyrosine to norepinephrine.

Concept introduction: Tyrosine is an aromatic amino acid that is the precursor molecule for the production of three neurotransmitters, dopamine, epinephrine and norepinephrine.

(b)

Summary Introduction

To explain: The biochemical changes that are required to convert tyrosine to epinephrine.

Concept introduction: Tyrosine is an aromatic amino acid that is the precursor molecule for the production of three neurotransmitters: dopamine, epinephrine and norepinephrine.

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Background Freezing isn't the only challenge in cryopreservation - thawing can be just as difficult. A microwave oven seems like a nice solution, since it deposits energy quickly and microwaves are non-ionizing radiation (they do not cause DNA mutation). However, water absorbs microwaves more effectively than ice does, meaning that the portion of an organ that has already melted will get warmer at a higher rate than the remaining ice – the opposite of what we want! - The transmission of radiation through a weakly absorbing material such as ice or water can be modeled by Beer's law, which assumes that the rate of absorption at a depth x is proportional to the local radiation intensity I(x) times an absorption coefficient, which is often written as μ or a or just µ). Noting that absorption decreases the intensity, we can write a differential equation a Solving the differential equation with the boundary condition on the surface being gives the relationship For a standard microwave oven…
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