scholarly journals Direct Visualization and Characterization of Interfacially Adsorbed Polymer atop Nanoparticles and within Nanocomposites

2021 ◽  
Author(s):  
Katelyn Randazzo ◽  
Malgorzata Bartkiewicz ◽  
Bartlomiej Graczykowski ◽  
Daniele Cangialosi ◽  
George Fytas ◽  
...  
Keyword(s):  
Direct Visualization ◽  
Adsorbed Polymer

scholarly journals Cell elastimetry in the detection of antineutrophil antibodies

Blood ◽  
1981 ◽  
Vol 57 (1) ◽  
pp. 22-24
Author(s):  
ME Miller ◽  
LA Boxer ◽  
EJ Kawaoka ◽  
WA Border
Keyword(s):  
Single Cell ◽  
Immune Complexes ◽  
Negative Pressure ◽  
Direct Visualization ◽  
Cell Assay ◽  
Membrane Rigidity ◽  
Blind Fashion

Cell elastimetry has been applied to the measurement of antineutrophil antibodies. This technique measures, under direct visualization, the negative pressure required of aspirate PMNs into small-pored pipettes. Two groups of studies were carried out: (A) In the first group of studies, normal PMNs were incubated with 1 of 8 known antineutrophil serums. Each serum significantly decreased membrane deformability-- i.e., cells became more rigid. The study was conducted in an entirely blind fashion. Randomly coded serums from patients and controls were studied for deformability by observers unaware of the code. (B) In the second group of studies, sera containing immune complexes were incubated with normal PMNs. No significant effects were noted upon deformability. As a single cell assay that partially reflects membrane rigidity, elastimetry may, therefore, have potential in the further characterization of mechanisms by which such antineutrophil antibodies compromise neutrophil functions.

Characterization of Human Coronary Sinus Valves by Direct Visualization during Biventricular Pacemaker Implantation

2007 ◽  
Vol 31 (1) ◽  
pp. 78-82 ◽  
Author(s):  
D.J. ANH ◽  
CHRISTIAN S. EVERSULL ◽  
HENRY A. CHEN ◽  
PIROOZ MOFRAD ◽  
NICHOLAS J. MOURLAS ◽  
...  
Keyword(s):  
Coronary Sinus ◽  
Pacemaker Implantation ◽  
Direct Visualization ◽  
Biventricular Pacemaker

Preparation and Characterisation of Surface Adsorbed Reduced Graphene Oxide/Polyaniline Nanocomposite on Polymer Membrane for Trimethylamine Sensing

2015 ◽  
Vol 1119 ◽  
pp. 24-28
Author(s):  
Rey Alfred G. Rañola ◽  
Isabella Concina ◽  
Elisabetta Comini ◽  
Fortunato B. Sevilla ◽  
Giorgio Sberveglieri
Keyword(s):  
Self Assembly ◽  
Limit Of Detection ◽  
Polymer Nanocomposite ◽  
Solution Blending ◽  
Flexible Material ◽  
Adsorbed Polymer ◽  
Blending Method ◽  
Reduced Graphene ◽  
Ft Ir

A graphene/polyaniline (rGO/PANi) nanocomposite was synthesized by solution blending method and deposited on to a nylon-6 membrane via vacuum assisted self-assembly (VASA) method to fabricate a flexible material applied as a chemoresistive gas sensor for trimethylamine (TMA). The morphological and structural characterization of surfaced adsorbed polymer nanocomposite was carried out by FT-IR, SEM, UV-Vis and surface profilometry. While, electrical property was carried out by four-point probe measurement. Prepared rGO/PANi nanocomposite has a percolation threshold around 0.40% vol. fraction, with a conductivity of 8.28 S/m (rsd = 3.0%, n=3) and thickness around 38.58 μm (rsd = 7.63%, n=3. The composite sensor exhibited linear range from 45 to 230 mg/L (r2= 0.9962) and the calculated limit of detection was 25.30 mg/L. It exhibited a repeatable response to TMA gas.

scholarly journals Mutational analysis of the Drosophila miniature-dusky (m-dy) locus: effects on cell size and circadian rhythms.

Genetics ◽  
1991 ◽  
Vol 128 (3) ◽  
pp. 571-582
Author(s):  
L M Newby ◽  
L White ◽  
S M DiBartolomeis ◽  
B J Walker ◽  
H B Dowse ◽  
...  
Keyword(s):  
Cell Size ◽  
Mutational Analysis ◽  
Genetic Characterization ◽  
Wing Development ◽  
Direct Visualization ◽  
Wild Type ◽  
Genetic Studies ◽  
Single Complex ◽  
And Behavior

Abstract A mutational analysis has been performed to explore the function of the Drosophila melanogaster miniature-dusky (m-dy) locus. Mutations at this locus affect wing development, fertility and behavior. The genetic characterization of 13 different mutations suggests that m and dy variants are alleles of a single complex gene. All of these mutations alter wing size, apparently by reducing the volume of individual epidermal cells of the developing wing. In m mutants, epidermal cell boundaries persist in the mature wing, whereas they normally degenerate 1-2 hr after eclosion in wild-type or dy flies. This has permitted the direct visualization of cell size differences among several m mutants. Mutations at the m-dy locus also affect behavioral processes. Three out of nine dy alleles (dyn1, dyn3 and dyn4) lengthen the circadian period of the activity and eclosion rhythms by approximately 1.5 hr. In contrast, m mutants have normal circadian periods, but an abnormally large percentage of individuals express aperiodic bouts of activity. These behavior genetic studies also indicate that an existing "rhythm" mutation known as Andante is an allele of the m-dy locus. The differential effects of certain m-dy mutations on wing and behavioral phenotypes suggest that separable domains of function exist within this locus.

scholarly journals The origin and characterization of conformational heterogeneity in adsorbed polymer layers

1997 ◽  
Vol 9 (37) ◽  
pp. 7699-7718 ◽  
Author(s):  
Jack F Douglas ◽  
Hildegard M Schneider ◽  
Peter Frantz ◽  
Robert Lipman ◽  
Steve Granick
Keyword(s):  
Conformational Heterogeneity ◽  
Polymer Layers ◽  
Adsorbed Polymer

Characterization of the Content of the Cavity Behind a High-Speed Supercavitating Body

2006 ◽  
Vol 129 (2) ◽  
pp. 136-145 ◽  
Author(s):  
Xiongjun Wu ◽  
Georges L. Chahine
Keyword(s):  
Sound Speed ◽  
High Speed ◽  
Test Facility ◽  
Direct Visualization ◽  
Acoustic Measurements ◽  
Supercavitating Flow ◽  
Flow Test ◽  
High Sound ◽  
Very High

A high speed/high flow test facility was designed and implemented to study experimentally the supercavitating flow behind a projectile nose in a controlled laboratory setting. The simulated projectile nose was held in position in the flow and the cavity interior was made visible by having the walls of the visualization facility “cut through” the supercavity. Direct visualization of the cavity interior and measurements of the properties of the cavity contents were made. Transducers were positioned in the test section within the supercavitation volume to enable measurement of the sound speed and attenuation as a function of the flow and geometry parameters. These characterized indirectly the content of the cavity. Photography, high speed videos, and acoustic measurements were used to investigate the contents of the cavity. A side sampling cell was also used to sample in real time the contents of the cavity and measure the properties. Calibration tests conducted in parallel in a vapor cell enabled confirmation that, in absence of air injection, the properties of the supercavity medium match those of a mixture of water vapor and water droplets. Such a mixture has a very high sound speed with strong sound attenuation. Injection of air was also found to significantly decrease sound speed and to increase transmission.

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