RHA™ anti-Ractopamine monoclonal antibody, clone RCT

Natural aggregates replaced partially or fully with recycled concrete aggregates (RCA) in preparing concrete has emerged as a sustainable construction technique and investigating the properties of such concrete has already been the focus of number of published studies. However, limited data are available for the case of recycled aggregate concrete (RAC) when it is exposed to extreme conditions like elevated temperatures resulting from accidental fires. In this study emphasis was, therefore, made to investigate residual properties of RAC in terms of compressive and tensile strengths, modulus of elasticity, Poisson's ratio, and concrete mass loss of RAC subjected to elevated temperatures by conducting a detailed experimental investigation. For this purpose, concrete cylindrical specimens were cast having 0%, 30%, 50%, 70% and 100% RCA. These cylinders were then exposed to elevated temperatures ranging from 250 to 900 degrees C. Based on the experimental results, Elastic modulus and Poisson's ratio were found to be significantly influenced for the specimens having percentages of recycled aggregates above 30% and when subjected to temperature elevation of above 500 degrees C. Overall, behaviour of RAC was more or less similar to natural aggregate concrete with a higher degree of deterioration. Furthermore, a residual strength factor (RSF) was also proposed to predict the residual strengths of RAC exposed to elevated temperatures which can be used effectively to estimate residual strengths of NAC and RAC when exposed to elevated temperatures.

Motile human-skin fibroblasts form macroscopic swirling patterns when grown to confluence on a culture dish. In this paper, we investigate the effect of coating the culture-dish surface with collagen on the resulting pattern, using human-skin fibroblast NB1RGB cells as the model system. The presence of the collagen coating is expected to enhance the adherence of the fibroblasts to the dish surface, and thereby also enhance the traction that the fibroblasts have as they move. We find that, contrary to our initial expectation, the coating does not significantly affect the motility of the fibroblasts. Their eventual number density at confluence is also unaffected. However, the coherence length of cell orientation in the swirling pattern is diminished. We also find that the fibroblasts cultured in collagen-coated dishes are rounder in shape and shorter in perimeter, compared with those cultured in uncoated polystyrene or glass culture dishes. We hypothesise that the rounder cell-shape which weakens the cell-cell nematic contact interaction is responsible for the change in coherence length. A simple mathematical model of the migrating fibroblasts is constructed, which demonstrates that constant motility with weaker nematic interaction strength does indeed lead to the shortening of the coherence length.