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Articles 63781 - 63810 of 294521
Full-Text Articles in Physical Sciences and Mathematics
Landscape-Level Impacts Of Mesquite Canopy Cover On Herbaceous Species Composition, D. B. Murray, C. E. Cooper
Landscape-Level Impacts Of Mesquite Canopy Cover On Herbaceous Species Composition, D. B. Murray, C. E. Cooper
IGC Proceedings (1977-2023)
Woody encroachment of mesquite (Prosopis) and acacia (Acacia) species into grasslands has widespread and ongoing impacts on grassland ecosystems. Changes in the herbaceous layer are associated with changes in the canopy cover of these sparse-canopied species, which do not exclude the herbaceous component, but often change species composition under the canopy relative to surrounding open areas. These effects are often differential based on productivity of the site and herbaceous species composition of the grassland. Here we investigated landscape-scale changes in the herbaceous composition resulting from changes in canopy cover of honey mesquite (Prosopis glandulosa) …
Interactive Effects Of Drought And Fire On Co-Existing Woody And Herbaceous Communities In A Temperate Mesic Grassland, R. Keen, J. Nippert, E. Tooley, K. O’Keefe, S. Bachle, M. Sandwick
Interactive Effects Of Drought And Fire On Co-Existing Woody And Herbaceous Communities In A Temperate Mesic Grassland, R. Keen, J. Nippert, E. Tooley, K. O’Keefe, S. Bachle, M. Sandwick
IGC Proceedings (1977-2023)
Increased drought and woody encroachment are likely to have substantial and interactive effects on grassland carbon and water cycling in the future. However, we currently lack necessary information to accurately predict grassland responses to drought-by-fire interactions in areas experiencing woody encroachment. A more thorough understanding of these interactive effects on grass-shrub physiology would improve the effectiveness of demographic vegetation models and refine predictions of future changes in grassland ecosystem function. To this end, we constructed passive rainout shelters over mature Cornus drummondii shrubs and co-existing grasses in two fire treatments (1-year and 4-year burn frequency) at the Konza Prairie Biological …
Interacting Effects Of Disease And Weather Variability On Rangeland Biodiversity Associated With Black-Tailed Prairie Dog (Cynomys Ludovicianus) Colonies, Courtney J. Duchardt, J. D. Hennig, D. Pellatz
Interacting Effects Of Disease And Weather Variability On Rangeland Biodiversity Associated With Black-Tailed Prairie Dog (Cynomys Ludovicianus) Colonies, Courtney J. Duchardt, J. D. Hennig, D. Pellatz
IGC Proceedings (1977-2023)
Rangeland ecosystems worldwide are experiencing novel pressures during the Anthropocene, including land conversion, disease dynamics, non-native species, and climate change. These issues can be compounded in rangelands occupied by burrowing rodents. Often considered keystone species important for maintaining rangeland biodiversity, these species often experience widespread control efforts because of their potential to reduce forage for livestock. We examined the effects of climatic variation and disease on bird communities associated with a North American burrowing rodent, the black-tailed prairie dog (Cynomys ludovicianus). Following an outbreak of sylvatic plague (Yersinia pestis) in the prairie dog population, we observed …
Influence Of Grazing Intensity On Nutrient Concentrations In Grass Tissue: Evidence From Two Savannah Grass Species, C. Munyati
IGC Proceedings (1977-2023)
High grazing intensity can accelerate the recycling of animal nutrients on savannah rangelands through the deposition of dung and, subsequently, nutrient mineralisation, uptake and concentration in grass tissue. The actual magnitude of this influence can vary depending on the grazing system. This study derived grazing system-dependent magnitudes of the influence of grazing intensity on concentrations of major (N, P, K, Ca, Mg, Na) and trace (B, Co, Cu, Cr, Fe, Mn, Mo, Ni, Se, Zn) animal nutrients in above ground grass tissue. Two grass species were examined: Brachiaria nigropedata, a decreaser, and Eragrostis lehmanniana, an increaser. For the …
Residue–Residue Contact Changes During Functional Processes Define Allosteric Communication Pathways, Xin-Qiu Joe Yao, Donald Hamelberg
Residue–Residue Contact Changes During Functional Processes Define Allosteric Communication Pathways, Xin-Qiu Joe Yao, Donald Hamelberg
Chemistry Faculty Publications
Allosteric regulation plays a central role in orchestrating diverse cellular processes. A prerequisite for allostery is a flexible biomolecule within which two distal sites can communicate via concerted or sequential conformational changes. We introduce a computational method to elucidate allosteric communication pathways, comprising critical allosteric residues, in biomolecules by taking advantage of conformational changes during a functional process. Conformational changes are modeled explicitly since they modulate the network of residue–residue interactions, which could propagate allosteric signals between two or more distal sites. The method implements the suboptimal path analysis in the framework of the difference contact network analysis or dCNA. …
Mgrre_Thinsections_Mgrre-78a_19, Mgrre
Mgrre_Thinsections_Mgrre-78a_7, Mgrre
Mgrre_Thinsections_Mgrre-78a_25, Mgrre
Mgrre_Thinsections_Mgrre-78a_15, Mgrre
Mgrre_Thinsections_Mgrre-78a_17, Mgrre
Mgrre_Thinsections_Mgrre-78a_1, Mgrre
Mgrre_Thinsections_Mgrre-78a_3, Mgrre
Mgrre_Thinsections_Mgrre-78a_4, Mgrre
Mgrre_Thinsections_Mgrre-78a_6, Mgrre
Mgrre_Thinsections_Mgrre-78a_8, Mgrre
Mgrre_Thinsections_Mgrre-78a_11, Mgrre
Mgrre_Thinsections_Mgrre-78a_10, Mgrre
Mgrre_Thinsections_Mgrre-78a_12, Mgrre
Mgrre_Thinsections_Mgrre-78a_14, Mgrre
Mgrre_Thinsections_Mgrre-78a_17, Mgrre
Mgrre_Thinsections_Mgrre-78a_18, Mgrre
Mgrre_Thinsections_Mgrre-78a_20, Mgrre
Mgrre_Thinsections_Mgrre-78a_21, Mgrre
Mgrre_Thinsections_Mgrre-78a_22, Mgrre
Mgrre_Thinsections_Mgrre-78a_23, Mgrre
Mgrre_Thinsections_Mgrre-78a_24, Mgrre
Mgrre_Thinsections_Mgrre-78a_3, Mgrre
Mgrre_Thinsections_Mgrre-78a_4, Mgrre