Connor Call

All Publications

• Evaluating the Rheo-electric Performance of Aqueous Suspensions of Oxidized Carbon Black. Journal of colloid and interface science Ramos, P. Z., Call, C. C., Simitz, L. V., Richards, J. J. 2022; 634: 379-387

  Abstract

  HYPOTHESIS: The macroscopic properties of carbon black suspensions are primarily determined by the agglomerate microstructure built of primary aggregates. Conferring colloidal stability in aqueous carbon black suspensions should thus have a drastic impact on their viscosity and conductivity.EXPERIMENTS: Carbon black was treated with strong acids following a wet oxidation procedure. An analysis of the resulting particle surface chemistry and electrophoretic mobility was performed in evaluating colloidal stability. Changes in suspension microstructure due to oxidation were observed using small-angle X-ray scattering. Utilizing rheo-electric measurements, the evolution of the viscosity and conductivity of the carbon black suspensions as a function of shear rate and carbon content was thoroughly studied.FINDINGS: The carboxyl groups installed on the carbon black surface through oxidation increased the surface charge density and enhanced repulsive interactions. Electrostatic stability inhibited the formation of the large-scale agglomerates in favor of the stable primary aggregates in suspension. While shear thinning, suspension conductivities were found to be weakly dependent on the shear intensity regardless of the carbon content. Most importantly, aqueous carbon black suspensions formulated from electrostatically repulsive primary aggregates displayed a smaller rise in conductivity with carbon content compared to those formulated from attractive agglomerates.

  View details for DOI 10.1016/j.jcis.2022.12.017

  View details for PubMedID 36542968

• Author Correction: Modular, programmable RNA sensing using ADAR editing in living cells. Nature biotechnology Kaseniit, K. E., Katz, N., Kolber, N. S., Call, C. C., Wengier, D. L., Cody, W. B., Sattely, E. S., Gao, X. J. 2022

  View details for DOI 10.1038/s41587-022-01617-3

  View details for PubMedID 36418591

• Modular, programmable RNA sensing using ADAR editing in living cells. Nature biotechnology Kaseniit, K. E., Katz, N., Kolber, N. S., Call, C. C., Wengier, D. L., Cody, W. B., Sattely, E. S., Gao, X. J. 2022

  Abstract

  With the increasing availability of single-cell transcriptomes, RNA signatures offer a promising basis for targeting living cells. Molecular RNA sensors would enable the study of and therapeutic interventions for specific cell types/states in diverse contexts, particularly in human patients and non-model organisms. Here we describe a modular, programmable system for live RNA sensing using adenosine deaminases acting on RNA (RADAR). We validate, and then expand, our basic design, characterize its performance, and analyze its compatibility with human and mouse transcriptomes. We identify strategies to boost output levels and improve the dynamic range. Additionally, we show that RADAR enables compact AND logic. In addition to responding to transcript levels, RADAR can distinguish disease-relevant sequence alterations of transcript identities, such as point mutations and fusions. Finally, we demonstrate that RADAR is a self-contained system with the potential to function in diverse organisms.

  View details for DOI 10.1038/s41587-022-01493-x

  View details for PubMedID 36198772

• Risuteganib-directed staining localizes in the Retinal Pigment Epithelium of Retinal Tissue from Aged, but not Young, Mice Koo, J., Call, C., Zhou, D., Park, J., Karageozian, H., Shao, V., Shao, Z., Kornfield, J. A. ASSOC RESEARCH VISION OPHTHALMOLOGY INC. 2022

  View details for Web of Science ID 000844437006177