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28 results on '"Lamar M"'

2. Periodic Orbit Continuation in Multiple Time Scale Systems.

Author

Krauskopf, Bernd, Osinga, Hinke M., Galán-Vioque, Jorge, Guckenheimer, John, and LaMar, M. Drew

Abstract

Continuation methods utilizing boundary value solvers are an effective tool for computing unstable periodic orbits of dynamical systems. Auto [7] is the standard implementation of these procedures. Unfortunately, the collocation methods used in Auto often require very fine meshes for convergence on problems with multiple time scales. This inconvenience prompts the search for alternative methods for computing such periodic orbits; we introduce here new multiple-shooting algorithms based on geometric singular perturbation theory. [ABSTRACT FROM AUTHOR]

Published
2007
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3. Biophysical changes in subcortical nuclei: the impact of diabetes and major depression

Author

Kumar, A, Yang, S, Ajilore, O, Wu, M, Cohen, J, Lamar, M, and Bhaumik, D

Abstract

Magnetization transfer (MT) is a neuroimaging technique that is frequently used to characterize the biophysical abnormalities in both gray and white matter regions of the brain. In our study, we used MT to examine the integrity of key nodes in frontal-subcortical circuits in four subject groups: patients diagnosed with type 2 diabetes with and without major depression (MDD), a healthy control group, and a group diagnosed with MDD without diabetes. In the MDD group, MT studies demonstrated lower magnetization transfer ratios (MTR), a marker of abnormalities in the macromolecular protein pool, in the thalami when compared with the control groups. The group with diabetes and MDD showed lower MTR in the globus pallidus when compared with the group with MDD. Biophysical measures, in subcortical nuclei, correlated inversely with measures of glycemic control, cerebrovascular burden and depression scores. These findings have broad implications for the underlying neuronal circuitry and neurobiology of mood disorders.

Published
2016
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28. LETTERS.

Author

LaMar, M. G., Thomas, Hartley, Madden, John, Moettus, Alda, and VanderPutten, Carl J.

Subjects
LETTERS to the editor, PHYSICIANS, MEDICAL appointments, EMERGENCY medical services, EMERGENCY medicine
Abstract

Several letters to the editor are presented in response to articles in previous issues including "Physician Bias Leads to Longer Waits" in the December 30, 2008 issue and the experience of an emergency department physician on the dangers of being a medical director in a clinic owned by a nonphysician.

Published
2009

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