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Bioscience

Biomaterials

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Displaying 1201 - 1225 of 1729

Biaxial Stress Dependence of the GaAs-Like and AlAs-Like Raman Lines in Al x Ga 1-x As

January 1, 2003
Author(s)
Grady S. White, Albert J. Paul, Kristine A. Bertness, Alexana Roshko
Raman peak shifts of Al xGa 1-xAs have been measured as a function of both x and applied biaxial stress in a backscatter geometry. Within the precision of the Raman measurements, the stress-induced peak shifts of the Raman singlet GaAs-like and AlAs-like

Chitosan Hydrogels Crosslink Kinetics and Gel Properties

January 1, 2003
Author(s)
Sheng Lin-Gibson, H J. Walls, S B. Kennedy, E R. Welsh
Cure kinetics and network properties of biocompatible hydrogels prepared by the reaction of chitosan and a water soluble blocked diisocyanate have been measured using rheometry. The reactions follow the Arrhenius behavior from which apparent activation

Glass-Fiber/Resin Interfacial Strength the Microbond Test and Chemical Evaluation

January 1, 2003
Author(s)
Walter G. McDonough, Joseph M. Antonucci, Joy Dunkers, Gary E. Schumacher
The quest for durable, aesthetic and bondable materials that can restore both the function and appearance of lost tooth structure has been a major concern for dental materials researchers. A significant advance, which ushered in the modern era of

Machining Damage Cracks: How to Find and Characterize Them by Fractography

January 1, 2003
Author(s)
George D. Quinn, L K. Ives, S Jahanmir
Subsurface machining cracks may control strength and performance of finished ceramics. Previously, machining cracks had been though to be difficult or impossible to detect and characterize, especially in toughened ceramics with interlocking grain

MALDI of Structured Polymer Particles

January 1, 2003
Author(s)
Barry J. Bauer, Kathleen M. Flynn
A layered preparation method is introduced that produces structured MALDI targets with well-defined phase sizes and compositions. Tri-a-naphthyl benzene is a glassy matrix that forms smooth films. It is layered with polystyrenes or polyethylene glycol

Measuring the Mechanical Properties of a Thin Polymeric Film by AFM

January 1, 2003
Author(s)
P M. McGuiggan, D J. Yarusso
The atomic force microscope is used to measure the tan delta (loss modulus/storate modulus) of a thin film of poly(n-butylacrylate) as a function of frequency. The AFM results are in good agreement with indenter measurements. The results demonstrate that

Mechanical Testing for Ceramics

January 1, 2003
Author(s)
George D. Quinn
This article describes (briefly) the common tests used for strength testing of ceramics.

Oxidative DNA Damage Biomarkers Used in Tissue Engineered Skin

January 1, 2003
Author(s)
H Rodriguez, Pawel Jaruga, M Birincioglu, Peter E. Barker, C D. O'Connell, M. Dizdaroglu
To assure that tissue engineered medical products are free of genetic changes that might occur from inflammation during the development phase of the product, our laboratory is responding to the need for test methods used to assess the safety and

Recent Developments in the Characterization of Anisotropic Void Populations in Thermal Barrier Coatings Using Ultra-Small Angle X-ray Scattering

January 1, 2003
Author(s)
Gabrielle G. Long, T A. Dobbins, Andrew J. Allen, J Ilavsky, P Jemain, A Kulkarni, H Herman
Thermal barrier coatings (TBC) have complex void microstructures which control their in service properties. In the research reported here, ultra-small-angle X-ray scattering (USAXS) has been used to characterize anisotropic void populations in TBC s. A new
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