Results 221 to 230 of about 30,016 (261)

Probing Chromatin Structure with Magnetic Tweezers

2018
Magnetic tweezers form a unique tool to study the topology and mechanical properties of chromatin fibers. Chromatin is a complex of DNA and proteins that folds the DNA in such a way that meter-long stretches of DNA fit into the micron-sized cell nucleus.
Artur, Kaczmarczyk, Thomas B, Brouwer, Chi, Pham, Nynke H, Dekker, John, van Noort   +4 more
openaire   +2 more sources

Magnetic nanowire-enhanced optomagnetic tweezers

2009 4th IEEE International Conference on Nano/Micro Engineered and Molecular Systems, 2008
We report an optomagnetic tweezers technique that utilizes the highly localized magnetic field gradients induced near the tip of a magnetic nanowire to provide strong trapping forces on magnetic nanoparticles with high spatial resolution. Integral to our approach is a method to trap, translate, and rotate a single magnetic nanowire in three dimensions.
Karan K. Mehta, Ting-Hsiang Wu, Eric P. Y. Chiou   +2 more
openaire   +1 more source

Magnetic Tweezers for Single-Molecule Manipulation

2011
Magnetic tweezers provide a versatile tool enabling the application of force and torque on individual biomolecules. Magnetic tweezers are uniquely suited to the study of DNA topology and protein-DNA interactions that modify DNA topology. Perhaps due to its presumed simplicity, magnetic tweezers instrumentation has been described in less detail than ...
Yeonee, Seol, Keir C, Neuman
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Soft magnetic tweezers: A proof of principle

Review of Scientific Instruments, 2011
We present here the principle of soft magnetic tweezers which improve the traditional magnetic tweezers allowing the simultaneous application and measurement of an arbitrary torque to a deoxyribonucleic acid (DNA) molecule. They take advantage of a nonlinear coupling regime that appears when a fast rotating magnetic field is applied to a ...
Francesco, Mosconi, Jean François, Allemand, Vincent, Croquette   +2 more
openaire   +2 more sources

Magnetic Tweezers for Single-Molecule Experiments

2009
Over the last decade, single-molecule techniques have proven their wide applicability in the study of processive motor proteins and other enzymes, yielding insight into their kinetics and mechanochemistry. In the context of force spectroscopy of protein–nucleic acid interactions, optical tweezers, magnetic tweezers, and atomic force microscopy have ...
Vilfan, I. D., Lipfert, Jan, Koster, D. A., Lemay, S. G., Dekker, N. H.   +4 more
openaire   +1 more source

Multiplexed single-molecule measurements with magnetic tweezers

Review of Scientific Instruments, 2008
We present a method for performing multiple single-molecule manipulation experiments in parallel with magnetic tweezers. We use a microscope with a low magnification, and thus a wide field of view, to visualize multiple DNA-tethered paramagnetic beads and apply an optimized image analysis routine to track the three-dimensional position of each bead ...
Noah, Ribeck, Omar A, Saleh
openaire   +2 more sources

Single-molecule covalent magnetic tweezers

Trends in Biochemical Sciences, 2023
Soham Chakraborty, Shubhasis Haldar
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Iron Under Pressure: “Kohn Tweezers” and Remnant Magnetism

Physical Review Letters, 2011
In this work we investigate the magnetic and structural properties of bulk Fe and Fe nanoparticles under pressure with x-ray absorption and emission spectroscopies providing answers to two fundamental questions: (a) the chicken-or-egg problem for the magnetic and structural transitions and (b) magnetism in the high pressure hcp phase.
Monza, A., Meffre, Anca, Baudelet, F., Rueff, J.-P., d'Astuto, M., Munsch, P., Huotari, S., Lachaize, S., Chaudret, Bruno, Shukla, Abhay   +9 more
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Magnetic tweezers in cell mechanics

The chapter provides an overview of the applications of magnetic tweezers in living cells. It discusses the advantages and disadvantages of magnetic tweezers technology with a focus on individual magnetic tweezers configurations, such as electromagnetic tweezers. Solutions to the disadvantages identified are also outlined. The specific role of magnetic
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Quadrupole Magnetic Tweezers for Precise Cell Transportation

IEEE Transactions on Biomedical Engineering
This research introduces a quadrupole magnetic tweezers which can be used for precise cell transportation by actuating magnetic spherical microrobots. The focus of the system is on navigating and manipulating cells within environments characterized by high cellular density. Demonstrating efficacy in moving cells through densely packed cell samples, the
Yanda Yang, Max Sokolich, Sudipta Mallick, Sambeeta Das   +3 more
openaire   +2 more sources