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Articles 1 - 2 of 2
Full-Text Articles in Biological Engineering
Quantitative Measurement Of The Brã¶Nsted Acid Sites In Solid Acids: Toward A Single-Site Design Of Mo-Modified Zsm-5 Zeolite, Jean-Philippe Tessonnier, Benoit Louis, Stephane Walspurger, Jean Sommer, Marc-Jacques Ledoux, Cuong Pham-Huu
Quantitative Measurement Of The Brã¶Nsted Acid Sites In Solid Acids: Toward A Single-Site Design Of Mo-Modified Zsm-5 Zeolite, Jean-Philippe Tessonnier, Benoit Louis, Stephane Walspurger, Jean Sommer, Marc-Jacques Ledoux, Cuong Pham-Huu
Jean-Philippe Tessonnier
On the basis of our previous H/D exchange studies devoted to the quantification of the number of Bro¨nsted acid sites in solid acids, we report here an innovative approach to determine both the amount and the localization of Mo atoms inside the Mo/ZSM-5 catalyst, commonly used for the methane dehydroaromatization reaction. The influence of Mo introduction in the MFI framework was studied by means of BET, X-ray diffraction, 27Al magic angle spinning NMR, NH3 temperature-programmed desorption, and H/D isotopic exchange techniques. A dependence was found between the decrease of acidic OH groups and the Mo content. Depending on the Si/Al …
Intracellular Signaling Networks In The Immune Response: Pathways Activated By Interleukin-2 And-4 Receptors And Their Roles In T Cell Proliferation, Kristen K. Comfort
Intracellular Signaling Networks In The Immune Response: Pathways Activated By Interleukin-2 And-4 Receptors And Their Roles In T Cell Proliferation, Kristen K. Comfort
Chemical and Materials Engineering Faculty Publications
Cells sense and respond to chemical and physical stimuli through signal transduction pathways, which mediate cell proliferation, differentiation, migration, and survival. The cytokines interleukin-2 (IL-2) and interleukin-4 (IL-4) are key regulators of the adaptive immune system, particularly influencing the clonal expansion and differentiation of T cells. At least in culture, both synergistic and antagonistic effects of IL-2 and -4 co-stimulation have been reported; the antagonism, when observed, is thought to arise from the utilization of a common subunit shared by IL-2 and IL-4 receptors. We have sought to characterize IL-2 and IL-4 signaling at the level of intracellular pathways activated …