The role of surface hydrophobicity in offset ink setting

2007 ◽  
Vol 22 (1) ◽  
pp. 57-60 ◽  
Author(s):  
Wei Gu ◽  
Douglas W. Bousfield ◽  
Carl P. Tripp
Keyword(s):  
Surface Hydrophobicity ◽  
Ink Setting

Bacteria Transport and Deposition under Unsaturated Flow Conditions: The Role of Water Content and Bacteria Surface Hydrophobicity

2008 ◽  
Vol 7 (2) ◽  
pp. 406-419 ◽  
Author(s):  
G. Gargiulo ◽  
S. A. Bradford ◽  
J. Simunek ◽  
P. Ustohal ◽  
H. Vereecken ◽  
...  
Keyword(s):  
Water Content ◽  
Unsaturated Flow ◽  
Surface Hydrophobicity ◽  
Flow Conditions ◽  
Bacteria Transport

scholarly journals Physiological function of Flo11p domains and the particular role of amyloid core sequences of this adhesin in Saccharomyces cerevisiae

2021 ◽  
Author(s):  
Clara Bouyx ◽  
Marion Schiavone ◽  
Marie-Ange Teste ◽  
Etienne Dague ◽  
Nathalie Sieczkowski ◽  
...  
Keyword(s):  
Cell Wall ◽  
Amyloid Β ◽  
Surface Hydrophobicity ◽  
Yeast Cells ◽  
Invasive Growth ◽  
Specific Domain ◽  
A Genome ◽  
A Cell ◽  
Cellular Aggregates

Flocculins are a family of glycosylated proteins that provide yeast cells with several properties such as biofilm formation, flocculation, invasive growth or formation of velum. These proteins are similarly organised with a N-terminal (adhesion) domain, a stalk-like central B-domain with several repeats and a C-terminal sequence carrying a cell wall anchor site. They also contain amyloid β-aggregation-prone sequences whose functional role is still unclear. In this work, we show that Flo11p differs from other flocculins by the presence of unique amyloid-forming sequences, whose the number is critical in the formation of adhesion nanodomains under a physical shear force. Using a genome editing approach to identify the function of domains in Flo11p phenotypes, we show that the formation of cellular aggregates whose density increases with the number of amyloid sequences cannot be attributed to a specific domain of Flo11p. The same is true for plastic adhesion and surface hydrophobicity the intensity of which depends mainly on the abundance of Flo11p on the cell surface. In contrast, the N and C domains of Flo11p are essential for invasive growth in agar, whereas a reduction in the number of repeats of the B domain weakens this phenotype. However, expression of FLO11 alone is not sufficient to trigger this invasion phenotype. Finally, we show that this flocculin contributes to the integrity of the cell wall.

scholarly journals Determination of surface-induced platelet activation by applying time-dependency dissipation factor versus frequency using quartz crystal microbalance with dissipation

2011 ◽  
Vol 8 (60) ◽  
pp. 988-997 ◽  
Author(s):  
Julien Fatisson ◽  
Sania Mansouri ◽  
Daniel Yacoub ◽  
Yahye Merhi ◽  
Maryam Tabrizian
Keyword(s):  
Platelet Activation ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Dissipation Factor ◽  
Surface Hydrophobicity ◽  
Activation Rate ◽  
Immunofluorescence Labelling ◽  
Activation Rates

Platelet adhesion and activation rates are frequently used to assess the thrombogenicity of biomaterials, which is a crucial step for the development of blood-contacting devices. Until now, electron and confocal microscopes have been used to investigate platelet activation but they failed to characterize this activation quantitatively and in real time. In order to overcome these limitations, quartz crystal microbalance with dissipation (QCM-D) was employed and an explicit time scale introduced in the dissipation versus frequency plots ( Df–t ) provided us with quantitative data at different stages of platelet activation. The QCM-D chips were coated with thrombogenic and non-thrombogenic model proteins to develop the methodology, further extended to investigate polymer thrombogenicity. Electron microscopy and immunofluorescence labelling were used to validate the QCM-D data and confirmed the relevance of Df–t plots to discriminate the activation rate among protein-modified surfaces. The responses showed the predominant role of surface hydrophobicity and roughness towards platelet activation and thereby towards polymer thrombogenicity. Modelling experimental data obtained with QCM-D with a Matlab code allowed us to define the rate at which mass change occurs ( A / B ), to obtain an A / B value for each polymer and correlate this value with polymer thrombogenicity.

scholarly journals Enhanced production of exopolysaccharide matrix and biofilm by a menadione-auxotrophic Staphylococcus aureus small-colony variant

2010 ◽  
Vol 59 (5) ◽  
pp. 521-527 ◽  
Author(s):  
Rachna Singh ◽  
Pallab Ray ◽  
Anindita Das ◽  
Meera Sharma
Keyword(s):  
Staphylococcus Aureus ◽  
Tricarboxylic Acid Cycle ◽  
Surface Hydrophobicity ◽  
Tricarboxylic Acid ◽  
Polysaccharide Intercellular Adhesin ◽  
Wild Type ◽  
Small Colony Variant ◽  
Enhanced Production ◽  
Small Colony

The role of Staphylococcus aureus small-colony variants (SCVs) in the pathogenesis of biofilm-associated infections remains unclear. This study investigated the mechanism behind increased biofilm-forming potential of a menadione-auxotrophic Staphylococcus aureus SCV compared with the wild-type parental strain, as recently reported by our laboratory. SCVs displayed an autoaggregative phenotype, with a greater amount of polysaccharide intercellular adhesin (PIA), significantly reduced tricarboxylic acid cycle activity and a decreased susceptibility to aminoglycosides and cell-wall inhibitors compared with wild-type. The biofilms formed by the SCV were highly structured, consisting of large microcolonies separated by channels, and contained more biomass as well as significantly more PIA than wild-type biofilms. The surface hydrophobicity of the two phenotypes was similar. Thus, the autoaggregation and increased biofilm-forming capacity of menadione-auxotrophic Staphylococcus aureus SCVs in this study was related to the enhanced production of PIA in these variants.

Role of lactobacillus cell surface hydrophobicity as probed by AFM in adhesion to surfaces at low and high ionic strength

2005 ◽  
Vol 41 (1) ◽  
pp. 33-41 ◽  
Author(s):  
Virginia Vadillo-Rodríguez ◽  
Henk J. Busscher ◽  
Henny C. van der Mei ◽  
Joop de Vries ◽  
Willem Norde
Keyword(s):  
Ionic Strength ◽  
Cell Surface ◽  
Cell Surface Hydrophobicity ◽  
Surface Hydrophobicity ◽  
High Ionic Strength

scholarly journals Factors associated with adherence to and biofilm formation on polystyrene byStenotrophomonas maltophilia: the role of cell surface hydrophobicity and motility

2008 ◽  
Vol 287 (1) ◽  
pp. 41-47 ◽  
Author(s):  
Arianna Pompilio ◽  
Raffaele Piccolomini ◽  
Carla Picciani ◽  
Domenico D'Antonio ◽  
Vincenzo Savini ◽  
...  
Keyword(s):  
Cell Surface ◽  
Biofilm Formation ◽  
Cell Surface Hydrophobicity ◽  
Surface Hydrophobicity ◽  
Factors Associated

Evaluation of the Role of Surfactant on the Surface Characterisation of Coal

2013 ◽  
Vol 634-638 ◽  
pp. 755-758
Author(s):  
Liang Gong ◽  
Zhi Yuan Yang ◽  
Jiang Long
Keyword(s):  
Sodium Dodecyl ◽  
Surface Hydrophobicity ◽  
Coal Surface ◽  
Surface Characterisation ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Higher Rank ◽  
The Impact ◽  
Coal Type

The surfaces of three China coals varying widely in coal type(Baode,Xiangshan,Jincheng) have been modified by adsorption of three surfactants( Sodium dodecyl sulfate,Polyethoxylated fatty alcohols,Alkyl phenol gather oxygen vinyl ether).The impact about coals of the surfactant has been explored by correlating three chemical characterisation techniques.Changes in coal surface hydrophobicity were assessed using contact angle measurements at the coal/water interface.The largest variation in zeta potential resulting from addition of surfactants was seen for the higher rank coals.The Specific surface area decreased when surfactants were present.

Sign in / Sign up

Export Citation Format

Share Document