Results 51 to 60 of about 148,798 (321)

An upper bound for the magnetic force gradient in graphite

, 2010
Cervenka et al. have recently reported ferromagnetism along graphite steps. We present Magnetic Force microscopy (MFM) data showing that the signal along the steps is independent of an external magnetic field.
Agustina Asenjo, David Martínez-Martín, H. Luth, Julio Gómez-Herrero, Miriam Jaafar, Rubén Pérez   +5 more
core   +1 more source

Practical aspects of Kelvin-probe force microscopy at solid/liquid interfaces in various liquid media [PDF]

, 2014
The distributions of surface charges or surface potentials on biological molecules and electrodes are directly related to various biological functions and ionic adsorptions, respectively.
Hirata, Yoshiki, Kobayashi, Kei, Matsushige, Kazumi, Oyabu, Noriaki, Umeda, Ken-ichi, Yamada, Hirofumi   +5 more
core   +1 more source

Dielectric Imaging of Fixed HeLa Cells by In-Liquid Scanning Dielectric Force Volume Microscopy

Nanomaterials, 2021
Mapping the dielectric properties of cells with nanoscale spatial resolution can be an important tool in nanomedicine and nanotoxicity analysis, which can complement structural and mechanical nanoscale measurements. Recently we have shown that dielectric
Martí Checa, Ruben Millan-Solsona, Adrianna Glinkowska Mares, Silvia Pujals, Gabriel Gomila   +4 more
doaj   +1 more source

Quantitative measurement of the surface charge density

, 2010
We present a method of measuring the charge density on dielectric surfaces. Similar to electrostatic force microscopy we record the electrostatic interaction between the probe and the sample surface, but at large tip-sample distances.
Bonnell D. A., Durand E., Elisabeth Soergel, Florian Johann, Soergel E.   +4 more
core   +1 more source

Disordered but rhythmic—the role of intrinsic protein disorder in eukaryotic circadian timing

FEBS Letters, EarlyView.
Unstructured domains known as intrinsically disordered regions (IDRs) are present in nearly every part of the eukaryotic core circadian oscillator. IDRs enable many diverse inter‐ and intramolecular interactions that support clock function. IDR conformations are highly tunable by post‐translational modifications and environmental conditions, which ...
Emery T. Usher, Jacqueline F. Pelham
wiley   +1 more source

Theory for measuring electric charge density of a ring from scanning force microscopy

AIP Advances
We consider a ring that carries an arbitrary electric charge density in the presence of a scanning force microscopy tip. We propose an algorithm that predicts this charge density from knowledge of the electrostatic ring-tip contribution to the total ...
M. Gordon, B. Goykadosh, Y. Magendzo, F. Zypman   +3 more
doaj   +1 more source

Weak dispersive forces between glass-gold macroscopic surfaces in alcohols [PDF]

, 2009
In this work we concentrate on an experimental validation of the Lifshitz theory for van der Waals and Casimir forces in gold-alcohol-glass systems. From this theory weak dispersive forces are predicted when the dielectric properties of the intervening ...
G. Palasantzas, H. B. G. Casimir, J. Israelachvili, J. Th. M. DeHosson, P. J. van Zwol   +4 more
core   +4 more sources

Nanoparticles charge response from electrostatic force microscopy [PDF]

Applied Physics Letters, 2013
Electrostatic force microscopy (EFM) allows measurement of tiny changes in tip-sample capacitance. When nanoobjects are studied by EFM, they only contribute a very small fraction of the total capacitance between the tip and the sample. We show that the analysis of 3D maps of the EFM signal allows extracting the contribution of the nanomaterial to the ...
Mottaghizadeh, A., Lang, P. L., Cui, L. M., Lesueur, J., Li, J., Zheng, D. N., Rebuttini, V., Pinna, N., Zimmers, A., Aubin, H.   +9 more
openaire   +2 more sources

The newfound relationship between extrachromosomal DNAs and excised signal circles

FEBS Letters, EarlyView.
Extrachromosomal DNAs (ecDNAs) contribute to the progression of many human cancers. In addition, circular DNA by‐products of V(D)J recombination, excised signal circles (ESCs), have roles in cancer progression but have largely been overlooked. In this Review, we explore the roles of ecDNAs and ESCs in cancer development, and highlight why these ...
Dylan Casey, Zeqian Gao, Joan Boyes
wiley   +1 more source

Revisiting contact potential difference in electrostatic force microscopy

Journal of Physics Communications
Understanding the tip–substrate interaction in Electrostatic Force Microscopy (EFM) is essential for the quantitative analysis of experimental data. In this work, the role of the contact potential difference ( V _CPD ) between tip and substrate, both ...
Lukas Lehnert, Ronald Thoelen, Hildegard Möbius   +2 more
doaj   +1 more source