Sadornas

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Project for Heidi Sadornas
Study on Glucose Metabolism and Diabetes
1. Write a description of the interaction of glucose and insulin in the body. Describe how
the sources enter and are removed during the metabolic process. Give a physiological
description what happens in the glucose tolerance test (GTT) where after fasting, a
subject is given a large quantity of glucose, then monitored to see how his or her body
responds. What happens when a subject has Type I diabetes (juvenile diabetes) and how
does this affect his or her response to the GTT. Give your best explanation of what is
known about the disease as far as causes, what initiates its onset, and how is it detected.
2. The Ackerman model for the blood glucose regulatory response to the GTT satisfies
the linear model given by
dg
 a1 g  a2 h  J (t )
dt
dh
 b1 g  b2 h
dt
From the physiology, determine if the constants a1, a2, b1, and b2 are positive, negative,
or zero. With J(t) = 0, solve this system of differential equations. (You can use Maple.)
Explain the type of solution and how diabetes would affect the solution for this model.
3. Find some data for the glucose tolerance test (for example http://wwwrohan.sdsu.edu/%7Ejmahaffy/courses/s00/math121/lectures/intro.html ). Fit this model to
these data. Give an explanation of how the GTT can be used to detect diabetes. What are
strengths and weaknesses of this model.
4. Use the web to browse for more recent mathematical models on detection of diabetes.
Discuss something about the models and how well they perform.
References:
E. Ackerman, L. Gatewood, J. Rosevear, and G. Molnar, Blood glucose regulation and
diabetes, Chap. 4 in Concepts and Models of Biomathematics, F. Heinmets, ed. Marcel
Dekker, 1969, 131-156.
M. Braun, Differential Equations and Their Applications, 3rd Edition, Springer-Verlag,
New York, 1983.
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