Events

Abstract [1]: Carbon nanotube field effect transistors have been shown to be effective low concentration biosensors. Low detection limits are important because it allows for early detection of diseases like cancer. The response of nanotubes to adsorped protein is still not fully understood, and we are investigating this response as a function of flow rate, concentration of protein, and dimensionality of the nanotube sensor. We have used polylysine adsorption as a model system to compare theoretical predictions with experiment

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Since the early work of Pauling and Corey, the paradigm for thinking about and modeling protein backbone geometry has been that of a single ideal set of bond lengths and angles for the peptide unit. Based on the crystallographically determined structures of proteins, I published work in the mid-90s showing that there is strong evidence for systematic variations in bond angles as a function of the conformational differences only involving rotations around single bonds. We are now surveying protein structures determined at <1 � resolution to better characterize the systematic variations.

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In this presentation I will report a strongly interacting new dendrimer system with an extended spectroscopic unit (coherent domain) beyond the trimer configuration. Strong cooperative enhancement of - two photon absorption cross-section was observed when going from the trimer arrangement to the next generation.

1. Density-functional study of the BaBi(Q)TiO_3 perovskite solid solution
   Using density-functional theory we predict properties of the solid solution perovskites BaBi(Q)TiO_3 where Q is Mg, Ni or Zn. These properties are strongly affected by the presence of both A-site and B-site disorder. We study all distinct orderings within a given 2x2x2 supercell.
2. Electrostatic signatures of single protein dynamics for detection with carbon nanotube sensors
   

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