scholarly journals Photoluminescence of Fully Inorganic Colloidal Gold Nanocluster and Their Manipulation Using Surface Charge Effects

2021 ◽  
pp. 2101549
Author(s):  
Anna R. Ziefuss ◽  
Torben Steenbock ◽  
Dominik Benner ◽  
Anton Plech ◽  
Jörg Göttlicher ◽  
...  
Keyword(s):  
Surface Charge ◽  
Colloidal Gold ◽  
Gold Nanocluster ◽  
Charge Effects

Surface-Charge Effects on Voltammetry in Carbon Nanocavities

2019 ◽  
Vol 91 (9) ◽  
pp. 5530-5536 ◽  
Author(s):  
Je Hyun Bae ◽  
Dengchao Wang ◽  
Keke Hu ◽  
Michael V. Mirkin
Keyword(s):  
Surface Charge ◽  
Charge Effects

Ratiometric Optical Sensing of Chloride Ions with Organic Fluorophore-Gold Nanoparticle Hybrids: A Systematic Study of Design Parameters and Surface Charge Effects

Small ◽  
2010 ◽  
Vol 6 (22) ◽  
pp. 2590-2597 ◽  
Author(s):  
Andreas Riedinger ◽  
Feng Zhang ◽  
Fabian Dommershausen ◽  
Carlheinz Röcker ◽  
Stefan Brandholt ◽  
...  
Keyword(s):  
Surface Charge ◽  
Gold Nanoparticle ◽  
Systematic Study ◽  
Optical Sensing ◽  
Chloride Ions ◽  
Design Parameters ◽  
Charge Effects ◽  
Organic Fluorophore

scholarly journals Conduction through the Inward Rectifier Potassium Channel, Kir2.1, Is Increased by Negatively Charged Extracellular Residues

2005 ◽  
Vol 125 (5) ◽  
pp. 493-503 ◽  
Author(s):  
Nazzareno D'Avanzo ◽  
Hee Cheol Cho ◽  
Illya Tolokh ◽  
Roman Pekhletski ◽  
Igor Tolokh ◽  
...  
Keyword(s):  
Surface Charge ◽  
Single Channel ◽  
Molecular Model ◽  
Chinese Hamster ◽  
Fluctuation Analysis ◽  
Channel Measurements ◽  
Surface Charges ◽  
Charge Effects ◽  
Current Decay ◽  
Inward Rectifier Potassium Channel

Ion channel conductance can be influenced by electrostatic effects originating from fixed “surface” charges that are remote from the selectivity filter. To explore whether surface charges contribute to the conductance properties of Kir2.1 channels, unitary conductance was measured in cell-attached recordings of Chinese hamster ovary (CHO) cells transfected with Kir2.1 channels over a range of K+ activities (4.6–293.5 mM) using single-channel measurements as well as nonstationary fluctuation analysis for low K+ activities. K+ ion concentrations were shown to equilibrate across the cell membrane in our studies using the voltage-sensitive dye DiBAC4(5). The dependence of γ on the K+ activity (aK) was fit well by a modified Langmuir binding isotherm, with a nonzero intercept as aK approaches 0 mM, suggesting electrostatic surface charge effects. Following the addition of 100 mM N-methyl-d-glucamine (NMG+), a nonpermeant, nonblocking cation or following pretreatment with 50 mM trimethyloxonium (TMO), a carboxylic acid esterifying agent, the γ–aK relationship did not show nonzero intercepts, suggesting the presence of surface charges formed by glutamate or aspartate residues. Consistent with surface charges in Kir2.1 channels, the rates of current decay induced by Ba2+ block were slowed with the addition of NMG or TMO. Using a molecular model of Kir2.1 channels, three candidate negatively charged residues were identified near the extracellular mouth of the pore and mutated to cysteine (E125C, D152C, and E153C). E153C channels, but not E125C or D152C channels, showed hyperbolic γ–aK relationships going through the origin. Moreover, the addition of MTSES to restore the negative charges in E53C channels reestablished wild-type conductance properties. Our results demonstrate that E153 contributes to the conductance properties of Kir2.1 channels by acting as a surface charge.

The behavior of polysilicic acid. I. Surface charge effects

1962 ◽  
Vol 58 (166) ◽  
pp. 147-184 ◽  
Author(s):  
S. A. Greenberg ◽  
T. N. Chang ◽  
R. Jarnutowski
Keyword(s):  
Surface Charge ◽  
Polysilicic Acid ◽  
Charge Effects

scholarly journals Evidence of surface charge effects in T-branch nanojunctions using microsecond-pulse testing

2011 ◽  
Vol 22 (44) ◽  
pp. 445203 ◽  
Author(s):  
I Iñiguez-de-la-Torre ◽  
J Mateos ◽  
Y Roelens ◽  
C Gardès ◽  
S Bollaert ◽  
...  
Keyword(s):  
Surface Charge ◽  
Charge Effects ◽  
Pulse Testing ◽  
Microsecond Pulse
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