Research Interests for Harold Layton
Research Interests: Mathematical Physiology
Professor Layton is modeling renal function at the
level of the nephron (the functional unit of
the kidney) and at the level of nephron populations. In
particular, he is studying tubuloglomerular feedback (TGF),
the urine concentrating mechanism, and the hemodynamics
of the afferent arteriole. Dynamic models for TGF
and the afferent arteriole involve small systems of semilinear hyperbolic partial
differential equations (PDEs) with timedelays,
and coupled ODES, which are
solved numerically for cases of physiological interest,
or which are linearized for qualitative analytical
investigation.
Dynamic models for the concentrating mechanism involve
large systems of coupled hyperbolic PDEs that describe
tubular convection and epithelial transport. Numerical
solutions of these PDEs help to integrate and interpret
quantities determined by physiologists in many separate
experiments.  Keywords:
 Absorption, Algorithms, Animals, Arterioles, Biological Clocks, Biological Transport, Active, Blood Pressure, Blood Vessels, Body Water, Calcium, Calcium Channels, Capillary Permeability, Cell Membrane Permeability, Cell Size, Compliance, Computer Simulation, Diet, Diffusion, Feedback, Feedback, Physiological, Glomerular Filtration Rate, Hemodynamics, Homeostasis, Humans, Hydrodynamics, Hypertrophy, Ion Transport, Kidney, Kidney Concentrating Ability, Kidney Diseases, Kidney Glomerulus, Kidney Medulla, Kidney Tubules, Kidney Tubules, Collecting, Loop of Henle, Mathematics, Membrane Potentials, Mice, Models, Animal, Models, Biological, Models, Statistical, Models, Theoretical, Muscle, Smooth, Vascular, Nephrons, Nonlinear Dynamics, Osmolar Concentration, Periodicity, Permeability, Potassium, Rats, Rats, Inbred SHR, Signal Transduction, Sodium, Sodium Chloride, Systole, Urea, Urine
 Areas of Interest:
Mathematical models of renal hemodynamics Mathematical models of the urine concentrating mechanism Numerical methods for models of renal systems Countercurrent systems in animals
 Recent Publications
 Sands, JM; Layton, HE, Advances in understanding the urineconcentrating mechanism.,
Annual Review of Physiology, vol. 76
(January, 2014),
pp. 387409, ISSN 00664278 [doi] [abs]
 Sands, JM; Mount, DB; Layton, HE, The physiology of water homeostasis,
in Core Concepts in the Disorders of Fluid, Electrolytes and AcidBase Balance
(November, 2013),
pp. 128, ISBN 9781461437703 [doi] [abs]
 NievesGonzález, A; Clausen, C; Layton, AT; Layton, HE; Moore, LC, Transport efficiency and workload distribution in a mathematical model of the thick ascending limb.,
American journal of physiology. Renal physiology, vol. 304 no. 6
(March, 2013),
pp. F653F664 [23097466], [doi] [abs]
 Sands, JM; Layton, HE, The Urine Concentrating Mechanism and Urea Transporters,
Seldin and Geibisch's The Kidney, vol. 1
(2013),
pp. 14631510 [doi]
 Layton, AT; Layton, HE, Countercurrent multiplication may not explain the axial osmolality gradient in the outer medulla of the rat kidney.,
American journal of physiology. Renal physiology, vol. 301 no. 5
(November, 2011),
pp. F1047F1056 [21753076], [doi] [abs]
