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Full-Text Articles in Physical Sciences and Mathematics
An Investigation Of Thermal Shock In Porous Clay Ceramics, Nima Rahbar, F. Nyongesa, S. Obwoya, J. Zimba, B. Aduda, W. Soboyejo
An Investigation Of Thermal Shock In Porous Clay Ceramics, Nima Rahbar, F. Nyongesa, S. Obwoya, J. Zimba, B. Aduda, W. Soboyejo
Nima Rahbar
The thermal shock resistance of porous ceramic materials is often characterized by the Hasselman parameters. However, in other scenarios, the room-temperature residual strengths after thermal shock are also used to quantify the damage due to thermal shock. This paper attempts to link the measured residual strengths to the dominant crack features that are introduced due to thermal shock in porous clay ceramics produced by the sintering of clay powders with well-controlled size ranges. Residual strength estimates from bend tests are compared with fracture mechanics predictions. The implications of the residual strength results are then discussed for the characterization of damage …
Progress Toward Removal Of The Purification Tag In A Putative Toxin Protein Via Site-Specific Mutagenesis And Proteolytic Cleavage, Joanna L. Fridlund, Bethany G. Taylor, Michael H. Godsey
Progress Toward Removal Of The Purification Tag In A Putative Toxin Protein Via Site-Specific Mutagenesis And Proteolytic Cleavage, Joanna L. Fridlund, Bethany G. Taylor, Michael H. Godsey
CUP Undergraduate Research
Putative toxin protein BC_2332, isolated from Bacillus cereus, which is a relative of Bacillus anthracis, shows similarity in the active site to ADP-ribosylating proteins present in cholera and diphtheria. Preliminary attempts to measure the activity of the putative toxin were unsuccessful leading to the hypothesis that the purification tag is hindering the activity. This hypothesis is supported by crystal structure analysis showing the putative active site occupied by the purification tag. Our objective was to remove the purification tag, via two different methods, in order to relieve potential inhibition. Both methods have faced obstacles and the work is continuing.