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Displaying 551 - 575 of 1721

Heat release and structural collapse of flexible polyurethane foam

January 1, 2010
Author(s)
Roland H. Kraemer, Mauro Zammarano, Gregory T. Linteris, Ulf W. Gedde, Jeffrey W. Gilman
Flexible polyurethane foam used in upholstered furniture remains one of the major fire hazards to date. The heat release rate of burning items made of foam depends strongly on the foam's physical behavior, notably its collapse to a burning liquid that can

IMMOBILIZED ENZYME CATALYZED POLYMERIZATION REACTIONS IN MICROREACTORS

January 1, 2010
Author(s)
Santanu S. Kundu, Atul Bhangale, William E. Wallace, Kathleen M. Flynn, Richard Gross, Kathryn L. Beers
Application of microreactor technologies enable improved safety, selectivity and yield in a range of chemical reactions in addition to new measurement methods that are often faster, cheaper and more accurate than traditional methods. In this study we have

IMPACT OF IMMOBILIZATION SUPPORTS FOR POLYESTERS SYNTHESIS ACTIVITY OF CANDIDA ANTARTICA LIPASE B

January 1, 2010
Author(s)
Atul Bhangale, Santanu S. Kundu, Wenchun Xie, William E. Wallace, Kathleen M. Flynn, Kathryn L. Beers, Richard Gross
Epoxy functionalized supports are known to be suitable for industrial-scale immobilization of enzymes for biocatalysis. However, chemistry across these epoxy groups is known to affect the catalytic performance of the enzymes.In order to achieve a balance

Nanofiber Supported Phospholipid Bilayers

December 27, 2009
Author(s)
Feng Yi, Jian Xu, David A. LaVan
This work reports on the creation and characterization of nanofiber supported bilayers to mimic the hydrodynamic, chemical and mechanical environment provided by the actin network which supports natural lipid bilayers within a cell. Lipid bilayers were

Gradient Nanofiber Scaffold Libraries for Rapid Screening of Cell-Material Interactions

December 1, 2009
Author(s)
Carl G. Simon Jr., Murugan Ramalingam, Marian F. Young, Vinoy Thomas
Scaffolds play a key role in tissue engineering wherein they provide structural support for cells to adhere, grow and guide them to synthesize tissue. Scaffolds made of multiple biomaterials are typically required to mimic the three-dimensional (3D)

NIST Reference Material Scaffolds for Tissue Engineering

December 1, 2009
Author(s)
Carl G. Simon Jr.
The National Institute of Standards and Technology (NIST) has deployed Reference Material (RM) scaffolds for tissue engineering: a series of well-characterized 3D tissue scaffolds with differing porosities (RM 8395, RM 8396 and RM 8397) (Fig. 1). Customers

Microstructure and Mineral Composition of Dystrophic Calcification Associated with the Idiopathic Inflammatory Myopathies

October 26, 2009
Author(s)
Naomi Eidelman, A Boyde, A.J. Bushby, P.G.T. Howell, Jirun Sun, F.W. Miller, P Robey, Lisa Rider
Calcified deposits are present in 30% of children with juvenile dermatomyositis (JDM) and less frequently in adult dermatomyositis (DM). This study aimed to determine the microstructure, composition and stiffness of these deposits. Specimens were analyzed

Viscoelastic Properties of Confined Polymer Films Measured via Thermal Wrinkling

October 8, 2009
Author(s)
Kirt A. Page, Edwin Chan, Se Hyuk Im, Derek L. Patton, Rui Huang, Christopher Stafford
We present a new measurement technique to quantify the viscoelastic properties of polymer thin films. This approach utilizes thermally-induced surface wrinkling to measure the rubbery modulus and shear viscosity of polymer thin films. Specifically, by

MORPHOLOGY AND FRACTURE OF ENAMEL

September 16, 2009
Author(s)
Sang-Won Myoung, James J. Lee, Paul Constantino, Peter Lucas, Brian R. Lawn
Teeth are remarkable biological structures, brittle but resilient. Here we examine the inter-relation between enamel morphology and crack resistance by sectioning human molar teeth after loading to fracture. The sections reveal that many cracks start from

PEG-HYDROGELS: SYNTHESIS, CHARACTERIZATION, AND CELL ENCAPSULATION

September 15, 2009
Author(s)
Sheng Lin-Gibson, Kaushik Chatterjee, James A. Cooper, William E. Wallace, Matthew Becker, Carl G. Simon Jr., Ferenc Horkay
A simple reaction to prepare controlled molecular mass (MM) poly(ethylene glycol) dimethacrylates (PEGDMs) of high purity and low polydispersity is outlined. PEGDMs were photo-polymerized to form hydrogels with and without bioactive moieties. The structure

Synthesis and Characterization of Elastin Mimetic Hybrid Polymers with Alternating Molecular Architecture and Elastomeric Properties

September 15, 2009
Author(s)
Sheng Lin-Gibson, Sarah E. Grieshaber, Alexandra J. Farran, Kristi L. Kiick, Xinqiao Jia
We are interested in developing elastin mimetic hybrid polymers (EMHPs) that capture the multiblock molecular architecture of tropoelastin as well as the remarkable elasticity of mature elastin. In this study, multiblock EMHPs containing flexible synthetic

Microbial colonization on polymers: Effects of sample preparation and incorporation of quaternary ammonium salts

September 13, 2009
Author(s)
Nancy J. Lin, Diana N. Zeiger, Joseph M. Antonucci, Bruce O. Fowler, Christopher M. Stafford, Sheng Lin-Gibson
Controlling bacterial growth in the oral environment presents many challenges. To address these challenges, new materials and treatments are needed along with controlled, reproducible methods to evaluate their efficacy. In this study, a reproducible method

Adhesion and Mechanics of Complex Polymer Interfaces

August 16, 2009
Author(s)
Christopher M. Stafford, Jun Y. Chung, Heqing Huang, Adam J. Nolte, Peter M. Johnson, Edwin P. Chan
The structure and properties of polymer interfaces play an integral role in numerous technological applications, particularly in the areas of coatings and adhesives. These interfacial interactions are dependent on a host of factors, including interfacial

Cell Interactions with Biomaterials Gradients and Arrays

August 4, 2009
Author(s)
Yanyin Yang, Vinoy Thomas, Abby W. Morgan, Shauna M. Dorsey, Carl Simon Jr.
Gradients and arrays have become very useful to the fields of tissue engineering and biomaterials.  Both gradients and arrays make efficient platforms for screening cell response to biomaterials.  Graded biomaterials also have functional applications and
Displaying 551 - 575 of 1721