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Microcytic anemia (mk) mice and Belgrade (b) rats are severely iron deficient because of impaired intestinal iron absorption and defective iron metabolism in peripheral tissues. Both animals carry a glycine to arginine substitution at position 185 in the iron transporter known as Nramp2/DMT1 (divalent metal transporter 1). DMT1 messenger RNA (mRNA) and(More)
The proton conductivity of a series of extruded Nafion membranes ͓of equivalent weight ͑EW͒ of 1100 and nominal dry thickness of 51, 89, 127, and 178 ␮m͔ has been studied. Measurements were made in 1 M H 2 SO 4 at 298 K using a four-electrode, dc technique. The membrane area resistance increases with thickness, as expected, from 0.07 to 0.16 ⍀ cm 2 for(More)
A polymer electrolyte membrane ͑PEM͒ fuel cell model that incorporates chemical degradation in perfluorinated sulfonic acid membranes is developed. The model is based on conservation principles and includes a detailed description of the transport phenomena. A degradation submodel describes the formation of hydrogen peroxide via distinct mechanisms in the(More)
We investigated 2 aspects of the hormonal regulation of maternal behavior in meadow voles (Microtus pennsylvanicus): (a) when the transition in maternal responsiveness from primarily hormonal control to regulation by pup cues occurs; and (b) the effect of housing enclosure size on maternal nest attendance in voles injected with a prolactin suppressant,(More)
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