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Articles 4531 - 4560 of 7320
Full-Text Articles in Entire DC Network
The Vine (2007-03)
The Vine, 1994-2008
The Vine was a successor to Reflections in Ink, published from 1994 to 2008. It transitioned from a mostly African American student perspective to a multi-cultural one.
[2007-02-22] Minutes Of A Regular Meeting Of The Board Of Visitors Of Virginia Commonwealth University February 22, 2007., Virginia Commonwealth University. Board Of Visitors
[2007-02-22] Minutes Of A Regular Meeting Of The Board Of Visitors Of Virginia Commonwealth University February 22, 2007., Virginia Commonwealth University. Board Of Visitors
VCU Board of Visitors Minutes
Official minutes of the VCU Board of Visitors and its Executive Committee.
Geometrical Modeling Of Fibrous Materials Under Compression, Benoit Maze, Hooman Vahedi Tafreshi, Behnam Pourdeyhimi
Geometrical Modeling Of Fibrous Materials Under Compression, Benoit Maze, Hooman Vahedi Tafreshi, Behnam Pourdeyhimi
Mechanical and Nuclear Engineering Publications
Many fibrous materials such as nonwovens are consolidated via compaction rolls in a so-called calendering process. Hot rolls compress the fiber assembly and cause fiber-to-fiber bonding resulting in a strong yet porous structure. In this paper, we describe an algorithm for generating three dimensional virtual fiberwebs and simulating the geometrical changes that happen to the structure during the calendering process. Fibers are assumed to be continuous filaments with square cross sections lying randomly in the x or y direction. The fibers are assumed to be flexible to allow bending over one another during the compression process. Lateral displacement is not …
Interaction Of Glycolysis And Mitochondrial Respiration In Metabolic Oscillations Of Pancreatic Islets, Richard Bertram, Leslie S. Satin, Morten Gram Pedersen, Dan S. Luciani, Arthur Sherman
Interaction Of Glycolysis And Mitochondrial Respiration In Metabolic Oscillations Of Pancreatic Islets, Richard Bertram, Leslie S. Satin, Morten Gram Pedersen, Dan S. Luciani, Arthur Sherman
Pharmacology and Toxicology Publications
Abstract
Insulin secretion from pancreatic β-cells is oscillatory, with a typical period of 2–7 min, reflecting oscillations in membrane potential and the cytosolic Ca2+ concentration. Our central hypothesis is that the slow 2–7 min oscillations are due to glycolytic oscillations, whereas faster oscillations that are superimposed are due to Ca2+ feedback onto metabolism or ion channels. We extend a previous mathematical model based on this hypothesis to include a more detailed description of mitochondrial metabolism. We demonstrate that this model can account for typical oscillatory patterns of membrane potential and Ca2+ concentration in islets. It also …
Electrospun Nitrocellulose And Nylon: Design And Fabrication Of Novel High Performance Platforms For Protein Blotting Applications, Ashley E. Manis, James R. Bowman, Gary L. Bowlin, David G. Simpson
Electrospun Nitrocellulose And Nylon: Design And Fabrication Of Novel High Performance Platforms For Protein Blotting Applications, Ashley E. Manis, James R. Bowman, Gary L. Bowlin, David G. Simpson
Anatomy and Neurobiology Publications
Background
Electrospinning is a non-mechanical processing strategy that can be used to process a variety of native and synthetic polymers into highly porous materials composed of nano-scale to micron-scale diameter fibers. By nature, electrospun materials exhibit an extensive surface area and highly interconnected pore spaces. In this study we adopted a biological engineering approach to ask how the specific unique advantages of the electrospinning process might be exploited to produce a new class of research/diagnostic tools.
Methods
The electrospinning properties of nitrocellulose, charged nylon and blends of these materials are characterized.
Results
Nitrocellulose electrospun from a starting concentration of < 110 mg/ml acetone deposited as 4–8 μm diameter beads; at 110 mg/ml-to-140 mg/ml starting concentrations, this polymer deposited as 100–4000 nm diameter fibers. Nylon formed fibers when electrospun from 60–140 mg/ml HFIP, fibers ranged from 120 nm-6000 nm in diameter. Electrospun nitrocellulose exhibited superior protein retention and increased sensitivity in slot blot experiments with respect to the parent nitrocellulose material. Western immunoblot experiments using fibronectin as a model protein demonstrated that electrospun nylon exhibits increased protein binding and increased dynamic range in the chemiluminescence detection of antigens than sheets of the parent starting material. Composites of electrospun nitrocellulose and electrospun nylon exhibit high protein binding activity and provide increased sensitivity for the immuno-detection of antigens.
Conclusion …
Menorah Review (No. 67, Summer/Fall, 2007)
Menorah Review (No. 67, Summer/Fall, 2007)
Menorah Review
A Poem by Richard E. Sherwin -- Camp Sisters: Women and the Holocaust -- From the Feminist's Corner -- Modern History and Modern Letters -- The Roots of Anti-Semitism -- Noteworthy Books
Art To Bring About Change: The Work Of Tyree Guyton, Melanie L. Buffington
Art To Bring About Change: The Work Of Tyree Guyton, Melanie L. Buffington
Art Education Publications
Public art takes many forms including commemorative sculptures, site-specific works, and collaborative murals. Additionally, public art can beautify an urban environment (Riley, 2005) or raise awareness of social issues in a manner similar to the AIDS quilt (Russell, 2004). Another possibility is that public works of art are a form of discourse and open conversations and dialogue. Such works of art can help communities work toward unity and empowerment (Hall, 1989; The Heidelberg Project, n.d.; Senie, 2006). As noted by Russell (2004) and Argiro (2004), studying public works of art can be an important part of art education. Tyree Guyton …