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Displaying 626 - 650 of 1736

Designing artificial cells to harness the biological ion gradient

November 23, 2008
Author(s)
Jian Xu, David A. LaVan
Cell membranes contain numerous natural nanoscale conductors, i.e. ion channels and ion pumps1-4, that work in concert to form transmembrane or transcellular ion gradients that can be triggered to release an action potential (AP)1, 5. Can artificial cells

Beta-Sheet Formation and RGD-Presentation Effects on Osteoblast Differentiation

November 15, 2008
Author(s)
Carl G. Simon Jr., Matthew Becker, Sheng Lin-Gibson, Kristen E. Roskov, David L. Kaplan, Abby W. Morgan
This report highlights our recent investigation into -sheet formation and RGD epitope presentation on the surface of blended silk films.1 Surface characterization of biomaterials for tissue engineering applications is of great importance to understand how

Electronic Structure and Chemistry of Iron-Based Metal Oxide Nanostructured Materials: A NEXAFS Investigation of BiFeO3, Bi2Fe4O9, a-Fe2O3, g-Fe2O3, and Fe/Fe3O4

November 6, 2008
Author(s)
Tae-Jin Park, S Sambasivan, Daniel A. Fischer, R Ramesh, J A. Misewich, S S. Wong
We present a systematic and detailed Near Edge X-ray Absorption Fine Structure (NEXAFS) experimental investigation of the electronic structure and chemistry of iron-based metal oxide nanostructured (FeMONS) materials including BiFeO3, Bi2Fe4O9, a-Fe2O3, ?-

Gradient Nanofiber Scaffold Libraries for Tissue Regeneration by Electrospinning

October 15, 2008
Author(s)
Carl G. Simon Jr., Murugan Ramalingam, Marian F. Young, Vinoy Thomas
Functional tissue engineering is a rapidly emerging biomedical field that holds great potential for healthcare in addressing the gap between need and availability of donor tissues and organs. The dogma in the field of tissue engineering is to harvest a

Impact of Sucrose Level on Storage Stability of Proteins in Freeze-Dried Solids: II. Correlation of Aggregation Rate with Protein Structure and Molecular Mobility

October 13, 2008
Author(s)
Bingquan S. Wang, Serguei Tchessalov, Marcus T. Cicerone, Nicholas W. Warne, Michael Pikal
The purpose of this study is to investigate the impact of sucrose level on storage stability of dried proteins and thus better understand the mechanism of protein stabilization by disaccharides in lyophilized products. Three IgG1 fusion proteins and two

Multi-sample micro-slit rheometry

September 17, 2008
Author(s)
Doyoung Moon, Anthony J. Bur, Kalman D. Migler
We have developed a multi-sample micro-slit rheometer MMR which is capable of measurements over a broad range of temperatures, viscosities and shear rates. The instrument is mechanically simple as the flow is generated by external gas pressure and the

Characterization of Laminin on Silanized Polydimethylsiloxane

August 21, 2008
Author(s)
Joy P. Dunkers, Lisa M. Hughes, Hae-Jeong Lee, Marvi Matos, Marcus T. Cicerone
In this work, we characterize a protein surface on a flexible polydimethylsiloxane substrate (PDMS) capable of undergoing strain. We compare the results from two different surface treatments: physically adsorbed laminin on PDMS and laminin deposited on

Characterization of Monolayer Formation on Aluminum-Doped Zinc Oxide Thin Films

August 21, 2008
Author(s)
C Rhodes, S E. Lappi, Daniel A. Fischer, S Sambasivan, Jan Genzer, S Franzen
The optical and electronic properties of aluminum-doped zinc oxide (AZO) thin films on a glass substrate have been investigated experimentally and theoretically. Optical studies with coupling in the Kretschmann configuration reveal an angle-dependent

Magnetic Resonance Microscopy of Collagen Mineralization

August 1, 2008
Author(s)
Ingrid E. Chesnick, Jeffrey T. Mason, Anthony A. Giuseppetti, Naomi Eidelman, Kimberlee Potter
A model mineralizing system was subjected to magnetic resonance microscopy (MRM), to investigate how water proton transverse (T2) relaxation times and magnetization transfer ratios (MTRs) can be applied to monitor collagen mineralization. In our model

Nature of Transition Layers at the SiO 2 /SiC Interface

July 14, 2008
Author(s)
T Zheleva, Aivars Lelis, G Duscher, F Liu, Igor Levin, M Das
Electrical performance of SiC-based microelectronic devices is strongly affected by the densities of interfacial traps introduced by the chemical and structural changes at the SiO2/SiC interfaces during processing. We analyzed the structure and chemistry

Roughness-Induced Superhydrophobicity: A Way to Design Non-Adhesive Surfaces

July 4, 2008
Author(s)
Michael Nosonovsky, Bharat Bhushan
Non-adhesive and water-repellent surfaces are required for many tribological applications. Roughness-induced superhydrophobicty has been suggested as a way to reduce adhesion and stiction. In this paper, the theory of roughness-induced superhydrophobicity

Finite element analysis of a crack tip in silicate glass: No evidence for a plastic zone

May 15, 2008
Author(s)
Theo Fett, G Rizzi, D Creek, Susanne Wagner, J.P. Guinn, JM Lopez-Cepero, Sheldon M. Wiederhorn
Recently, the claim was made that cracks in silicate glasses propagate by the nucleation, growth, and coalescence of cavities at crack tips, which is the same way as in metals but at a much smaller scale. This hypothesis for crack growth is based in part

Close Proximity Self-Aligned Shadow Mask for Sputter Deposition Onto a Membrane or Cavity

May 5, 2008
Author(s)
Ravi Kummamuru, L Hu, Lawrence P. Cook, M Y. Efremov, E A. Olson, Martin L. Green, L H. Allen
In this paper we report fabrication of a shadow mask designed for sputtering into cavities or on the back surface of freestanding silicon nitride (SiNx) membranes. Sputter deposition through a shadow mask typically results in spreading of the deposited

EVALUATION OF MULTI-SAMPLE MICRO-CAPILLARY RHEOMETER

May 5, 2008
Author(s)
Doyoung Moon, Anthony J. Bur, Kalman D. Migler
We present a Multi-sample Micro-capillary Rheometer (MMR) which is capable of measurements over a broad range of temperatures, viscosities and shear rates. The instrument is simple as the flow is generated by external gas pressure and the shear rate is

Crystal Structure, Stoichiometry, and Dielectric Relaxation in Bi 3.32 Nb 7.09 O 22.7 and Structurally Related Ternary Phases

April 17, 2008
Author(s)
I E. Grey, Terrell A. Vanderah, W G. Mumme, Robert S. Roth, Jorge T. Guzman, Juan C. Nino, Igor Levin
Ceramic materials which exhibit high relative dielectric permittivities and are processible at temperatures in the 1000 C to 1200 C range are of interest for embedded elements such as capacitor, resonators, and filters. Complex titanates, niobates, and
Displaying 626 - 650 of 1736
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