Heather L. Smith

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Tonic receptors convey stimulus duration and intensity and are implicated in homeostatic control. However, how tonic homeostatic signals are generated and how they reconfigure neural circuits and modify animal behavior is poorly understood. Here we show that Caenorhabditis elegans O2-sensing neurons are tonic receptors that continuously signal ambient [O2](More)
Vibrio cholerae was isolated from cloacal swabs and freshly voided feces collected from 20 species of aquatic birds in Colorado and Utah during 1986 and 1987. About 17% (198 of 1,131) fecal specimens collected from July 1986 through August 1987 contained the organism. Both O1 and non-O1 V. cholerae strains were isolated from the fecal specimens. Isolates(More)
Many methods have been devised to detect the action of bacterial cultures in or on gelatin media. The traditional gelatin stab technique involves incubation of the culture below the thermal liquefaction point of the gelatin in order to inaintain the gel structure so that the shape and size of the liquefied portion can be observed. A long incubation time is(More)
Non-O1 Vibrio cholerae was isolated from rivers, creeks, washes, irrigation canals, and ditches in western Colorado during the summer of 1985. The organism occurred in fresh water (less than or equal to 5 mmol of Na+ per liter) as well as in water of higher salinity (approximately equal to 17 mmol per liter). Sixteen serovars of non-O1 V. cholerae were(More)
Analyses of fluted point technology and Paleoindian technological risk have contributed to our understanding of human adaptation across North America in the late Pleistocene and early Holocene. However, poor chronological control has dissuaded similar studies of fluted points found in Alaska and northern Yukon and our understanding of their adaptive role in(More)
Beringia for origins of the first Americans, explaining the peopling of the Americas as the result of migration from Asia to North America via Beringia, the northern expanse that connected the two continents during the late Pleistocene. Beringia and Siberia, however, have yet to provide an obvious archaeological progenitor predating and resembling Clovis(More)
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