Published by Elsevier B.V.”
“The effects of graphene oxide (GO) on the yield stress-pH of -Al2O3 (alumina) suspensions were investigated. For micron-sized platelet alumina suspensions, micron-sized GO additive increased the maximum

yield find more stress by as much as six-folds. This was attributed to GO-mediated bridging interactions between the platelet particles. This type of bridging interactions was much less effective with submicron-sized, spherical, and irregular shape alumina. Adsorption of the anionic GO reflected by the shift of pH of zero zeta potential to a lower pH is particularly high for platelet alumina. The 1.0 dwb % GO concentration added is sufficient to reinforce each platelet particle-particle bond, assisted by a directed GO-platelet interaction configuration. This BIX 01294 Epigenetics inhibitor is, however, not true with submicron-sized particles as the particle concentration

increases sharply with the inverse of the particle diameter to power of 3. Moreover, a GO sheet can adsorb several submicron-sized particles and this does not produce the right interaction configuration. (c) 2013 American Institute of Chemical Engineers AIChE J, 59: 3633-3641, 2013″
“1. Plants produce biomass and then allocate some of it to reproductive structures, so the relationship between reproductive (R) and vegetative (V) mass is a fundamental aspect of a plants reproductive strategy.\n\n2. Differences among populations or taxa in the allometric relationship between R and V have been attributed to environmental CX-6258 clinical trial conditions. We hypothesize that populations and taxa living at high elevations should exhibit a lower log R vs. log V slope than those in more benign environments, because the environmental limits on size in alpine environments should favour a relatively large reproductive allocation at smaller sizes and a smaller investment in reproduction per additional unit of biomass accumulated.\n\n3. We investigated variation in the allometric relationship

between R and V among 44 naturally occurring populations representing 24 species of Pedicularis in the Tibetan Plateau, to test the hypothesis that the slope of the relationship declines with increasing elevation.\n\n4. There was a significant negative relationship between the slope of the log R vs. log V relationship and elevation among populations, although the relationship among populations within species varied. We interpret this in terms of abiotic limitations on size and decreasing efficiency of resource allocation to reproduction with increasing plant size (measured as vegetative biomass) at high elevations. We also found a significant positive relationship between the gamma-intercept of the regression of log R on log V and elevation across species, but the relationship was not significant among populations within species.