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Diversity And Structure Of Bacterial Chemolithotrophic Communities In Pine Forest And Agroecosystem Soils, J. Tolli, G. M. King
Diversity And Structure Of Bacterial Chemolithotrophic Communities In Pine Forest And Agroecosystem Soils, J. Tolli, G. M. King
Faculty Publications
Obligate lithotrophs (e.g., ammonia oxidizers) and facultative lithotrophs (e.g., CO and hydrogen oxidizers) collectively comprise a phylogenetically diverse functional group that contributes significantly to carbon and nitrogen cycles in soils and plays important roles in trace gas dynamics (e.g., carbon monoxide and nitrous and nitric oxides) that affect tropospheric chemistry and radiative forcing. In spite of their diverse physiologies, facultative and obligate lithotrophs typically possess the Calvin-Benson-Bassham cycle enzyme, ribulose-1,5-bisphosphate carboxylase/oxygenase (rubisCO). In an effort designed to understand the structure of lithotrophic communities in soil, genomic DNA extracts from surface (0 to 2 cm) and subsurface (5 to 7 cm) …
Phytochrome Evolution In Green And Nongreen Plants, Sarah Mathews
Phytochrome Evolution In Green And Nongreen Plants, Sarah Mathews
Faculty Publications
Photoreceptors are critical molecules that function at the interface between organism and environment. Plants use specific light signals to determine their place in time and space, allowing them to synchronize their growth, metabolism, and development to the environments in which they occur. Thus, innovation in light sensing mechanisms is expected to coincide with adaptation and diversification. Three studies involving the well-characterized phytochrome photoreceptor system in plants indicate that much work is yet needed to test this expectation. In early diverging dowering plants, episodic positive selection influenced the evolution of phytochrome A, but little of the functional data needed to link …
Hibernation Is Recorded In Lower Incisors Of Recent And Fossil Ground Ssquirrels (Spermophilus), Tom Goodwin, Gail R. Michener, Daniel Gonzalez, Caroline E. Rinaldi
Hibernation Is Recorded In Lower Incisors Of Recent And Fossil Ground Ssquirrels (Spermophilus), Tom Goodwin, Gail R. Michener, Daniel Gonzalez, Caroline E. Rinaldi
Faculty Publications
Incremental dentin and associated enamel, features visible on the surface of lower incisors, were characterized for 3 species of ground squirrels (Spermophilus): Pleistocene and Recent S. elegans, Recent S. richardsonii, and Recent S. parryii. A hibernation mark was evident in incisor dentin and enamel, most characteristically as a sleeve of enamel terminating basally adjacent to medially depressed dentin with indistinct and often very fine increments. This mark was absent in juveniles but present in older animals of both sexes for at least 6 weeks after hibernation, eventually being lost through growth and wear of the incisor. Temporal association with hibernation …