Daily Archives: February 4, 2014

Electrospun Meta-aramid Mats and Their Application

This week’s Engineering Research Center-Bioengineering Joint Seminar, Friday February 7, 11 a.m., McNair Hall, Auditorium:

Topic: Electrospun Meta-aramid Mats and Their Application

headshot of Dr. Kim

Dr. Hak Yong Kim

Speaker: Dr. Hak Yong Kim, Professor of Bio-Info-Nano Fusion Technology and Professor of Organic Materials and Fiber, Chonbuk National University, Jeonbuk, Korea.  Dr. Kim’s areas of research include biomaterials, polymeric composites and functional materials. He has 245 refereed journal publications with a total of over 5,200 citations. He holds 6 U.S. patents and 80 Korean patents.

Abstract: The effect of salt formation during condensation polymerization on the  morphology of electrospun meta-aramid fibers was investigated. The presence of a by-product salt (calcium chloride, CaCl2) improved the electrospinnability of the meta-aramid solution and induced the formation of a spider-web-like structure in the mats.

The effect of the concentration of the solution and applied voltage on the formation of the spider-web-like fibrous structure was investigated. FE-SEM images indicated that the very thin fibers were uniformly distributed with thick fibers throughout the mats in the form of a spider-web-like structure. TGA showed that the thermal stability of the electrospun meta-aramid mats was affected by CaCl2.

The observed enhancement in the thermal and mechanical properties of the mats, which was attributed to the formation of the spider-web-like structure, may increase the number of potential applications of meta-aramid, such as second battery separator, water/air filtration, protective clothing and electrical insulation.

Weekly Biology seminar: Kinase regulation

This week’s Department of Biology weekly seminar,  Wednesday February 5, noon, Barnes Hall, Room 221:

Topic: New and Emerging Modes of Kinase Regulation

Speaker: Dr. Robert Newman, Assistant Professor of Biology

Abstract: Protein phosphorylation, mediated by protein kinases, is one of the most widespread regulatory mechanisms in eukaryotes. Inside the cell, kinases and their respective substrates are organized into complex phosphorylation networks that govern nearly all cellular processes.

To achieve signaling specificity in response to a given environmental stimulus, these networks must be precisely coordinated in cellular space and time. This involves regulation both at the level of kinase activity and at the level of substrate selection. Consequently, much effort has been devoted to understanding how these parameters are controlled inside cells.

In this seminar, we will explore two modes of kinase regulation, namely proteolytic processing and reversible oxidation, that have been relatively understudied but are emerging as important modulators of kinase activity in health and disease.