Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 9 of 9
Full-Text Articles in Physics
Ultrasound Regulated Flexible Protein Materials: Fabrication, Structure And Physical-Biological Properties., Bowen Cai, Hanling Gu, Fang Wang, Kyle Printon, Zhenggui Gu, Xiao Hu
Ultrasound Regulated Flexible Protein Materials: Fabrication, Structure And Physical-Biological Properties., Bowen Cai, Hanling Gu, Fang Wang, Kyle Printon, Zhenggui Gu, Xiao Hu
Faculty Scholarship for the College of Science & Mathematics
Ultrasound can be used in the biomaterial field due to its high efficiency, easy operation, no chemical treatment, repeatability and high level of control. In this work, we demonstrated that ultrasound is able to quickly regulate protein structure at the solution assembly stage to obtain the designed properties of protein-based materials. Silk fibroin proteins dissolved in a formic acid-CaCl solution system were treated in an ultrasound with varying times and powers. By altering these variables, the silks physical properties and structures can be fine-tuned and the results were investigated with Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron …
Structural And Morphological Properties Of Wool Keratin And Cellulose Biocomposites Fabricated Using Ionic Liquids, Karleena Rybacki, Stacy A. Love, Bailey Blessing, Abneris Morales, Emily Mcdermott, Kaylyn Cai, Xiao Hu, David Salas-De La Cruz
Structural And Morphological Properties Of Wool Keratin And Cellulose Biocomposites Fabricated Using Ionic Liquids, Karleena Rybacki, Stacy A. Love, Bailey Blessing, Abneris Morales, Emily Mcdermott, Kaylyn Cai, Xiao Hu, David Salas-De La Cruz
Faculty Scholarship for the College of Science & Mathematics
In this study, the structural, thermal, and morphological properties of biocomposite films composed of wool keratin mixed with cellulose and regenerated with ionic liquids and various coagulation agents were characterized and explored. These blended films exhibit different physical and thermal properties based on the polymer ratio and coagulation agent type in the fabrication process. Thus, understanding their structure and molecular interaction will enable an understanding of how the crystallinity of cellulose can be modified in order to understand the formation of protein secondary structures. The thermal, morphological, and physiochemical properties of the biocomposites were investigated by Fourier transform infrared (FTIR) …
Replicating Analyses Of Item Response Curves Using Data From The Force And Motion Conceptual Evaluation, Connor J. Richardson, Trevor Smith, Paul J. Walter
Replicating Analyses Of Item Response Curves Using Data From The Force And Motion Conceptual Evaluation, Connor J. Richardson, Trevor Smith, Paul J. Walter
Faculty Scholarship for the College of Science & Mathematics
Ishimoto, Davenport, and Wittmann have previously reported analyses of data from student responses to the Force and Motion Conceptual Evaluation (FMCE), in which they used item response curves (IRCs) to make claims about American and Japanese students’ relative likelihood to choose certain incorrect responses to some questions. We have used an independent dataset of over 6,500 American students’ responses to the FMCE to generate IRCs to test their claims. Converting the IRCs to vectors, we used dot product analysis to compare each response item quantitatively. For most questions, our analyses are consistent with Ishimoto, Davenport, and Wittmann, with some results …
Air-Spun Silk-Based Micro-/Nanofibers And Thin Films For Drug Delivery, Christopher R Gough, Xiao Hu
Air-Spun Silk-Based Micro-/Nanofibers And Thin Films For Drug Delivery, Christopher R Gough, Xiao Hu
Faculty Scholarship for the College of Science & Mathematics
Micro-/nanofibers have shown high promise as drug delivery vehicles due to their high porosity and surface-area-to-volume ratio. The current study utilizes air-spraying, a novel fiber fabrication technique, to create silk micro-/nanofibers without the need for a high voltage power source. Air-spraying was used to create silk fibrous mats embedded with several model drugs with high efficiency. In order to compare the effect of biomaterial geometry on the release of the model drugs, silk films were also created and characterized. Fourier-transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and a drug release study were …
Silk-Cellulose Acetate Biocomposite Materials Regenerated From Ionic Liquid, Ashley Rivera-Galetti, Chrtstopher R. Gough, Farhan Kaleem, Michael Burch, Chris Ratcliffe, Ping Lu, David Salas-De La Cruz, Xiao Hu
Silk-Cellulose Acetate Biocomposite Materials Regenerated From Ionic Liquid, Ashley Rivera-Galetti, Chrtstopher R. Gough, Farhan Kaleem, Michael Burch, Chris Ratcliffe, Ping Lu, David Salas-De La Cruz, Xiao Hu
Faculty Scholarship for the College of Science & Mathematics
The novel use of ionic liquid as a solvent for biodegradable and natural organic biomaterials has increasingly sparked interest in the biomedical field. As compared to more volatile traditional solvents that rapidly degrade the protein molecular weight, the capability of polysaccharides and proteins to dissolve seamlessly in ionic liquid and form fine and tunable biomaterials after regeneration is the key interest of this study. Here, a blended system consisting of Bombyx Mori silk fibroin protein and a cellulose derivative, cellulose acetate (CA), in the ionic liquid 1-ethyl-3-methylimidazolium acetate (EMIMAc) was regenerated and underwent characterization to understand the structure and physical …
Protein And Polysaccharide-Based Electroactive And Conductive Materials For Biomedical Applications, Xiao Hu, Samuel Ricci, Sebastian Naranjo Naranjo, Zachary Hill, Peter Gawason
Protein And Polysaccharide-Based Electroactive And Conductive Materials For Biomedical Applications, Xiao Hu, Samuel Ricci, Sebastian Naranjo Naranjo, Zachary Hill, Peter Gawason
Faculty Scholarship for the College of Science & Mathematics
Electrically responsive biomaterials are an important and emerging technology in the fields of biomedical and material sciences. A great deal of research explores the integral role of electrical conduction in normal and diseased cell biology, and material scientists are focusing an even greater amount of attention on natural and hybrid materials as sources of biomaterials which can mimic the properties of cells. This review establishes a summary of those efforts for the latter group, detailing the current materials, theories, methods, and applications of electrically conductive biomaterials fabricated from protein polymers and polysaccharides. These materials can be used to improve human …
Selection Rule For Topological Amplifiers In Bogoliubov De Gennes Systems, Hong Y. Ling, Ben Kain
Selection Rule For Topological Amplifiers In Bogoliubov De Gennes Systems, Hong Y. Ling, Ben Kain
Faculty Scholarship for the College of Science & Mathematics
Dynamical instability is an inherent feature of bosonic systems described by the Bogoliubov de Geenes (BdG) Hamiltonian. Since it causes the BdG system to collapse, it is generally thought that it should be avoided. Recently, there has been much effort to harness this instability for the benefit of creating a topological amplifier with stable bulk bands but unstable edge modes which can be populated at an exponentially fast rate. We present a theorem for determining the stability of states with energies sufficiently away from zero, in terms of an unconventional commutator between the number conserving part and number nonconserving part …
Chemical, Thermal, Time, And Enzymatic Stability Of Silk Materials With Silk I Structure, Meihui Zhao, Zhenzhen Qi, Xiaosheng Tao, Chad Newkirk, Xiao Hu, Shenzhou Lu
Chemical, Thermal, Time, And Enzymatic Stability Of Silk Materials With Silk I Structure, Meihui Zhao, Zhenzhen Qi, Xiaosheng Tao, Chad Newkirk, Xiao Hu, Shenzhou Lu
Faculty Scholarship for the College of Science & Mathematics
The crystalline structure of silk fibroin Silk I is generally considered to be a metastable structure; however, there is no definite conclusion under what circumstances this crystalline structure is stable or the crystal form will change. In this study, silk fibroin solution was prepared from B. Mori silkworm cocoons, and a combined method of freeze-crystallization and freeze-drying at different temperatures was used to obtain stable Silk I crystalline material and uncrystallized silk material, respectively. Different concentrations of methanol and ethanol were used to soak the two materials with different time periods to investigate the effect of immersion treatments on the …
Dual-Crystallizable Silk Fibroin/Poly(L-Lactic Acid) Biocomposite Films: Effect Of Polymer Phases On Protein Structures In Protein-Polymer Blends, Fang Wang, Yingying Li, Christopher R. Gough, Qichun Liu, Xiao Hu
Dual-Crystallizable Silk Fibroin/Poly(L-Lactic Acid) Biocomposite Films: Effect Of Polymer Phases On Protein Structures In Protein-Polymer Blends, Fang Wang, Yingying Li, Christopher R. Gough, Qichun Liu, Xiao Hu
Faculty Scholarship for the College of Science & Mathematics
Biopolymer composites based on silk fibroin have shown widespread potential due to their brilliant applications in tissue engineering, medicine and bioelectronics. In our present work, biocomposite nanofilms with different special topologies were obtained through blending silk fibroin with crystallizable poly(L-lactic acid) (PLLA) at various mixture rates using a stirring-reflux condensation blending method. The microstructure, phase components, and miscibility of the blended films were studied through thermal analysis in combination with Fourier-transform infrared spectroscopy and Raman analysis. X-ray diffraction and scanning electron microscope were also used for advanced structural analysis. Furthermore, their conformation transition, interaction mechanism, and thermal stability were also …