Synthesis, structures and magnetism of a series of dinuclear and one-dimensional Ni–Ln complexes: single-molecule magnetic behavior in one-dimensional nitrate-bridged Dy analogue

2015 ◽  
Vol 39 (11) ◽  
pp. 8356-8363 ◽  
Author(s):  
Min-Xia Yao ◽  
Xing-Yun Lu ◽  
Zhao-Xia Zhu ◽  
Xiao-Wei Deng ◽  
Su Jing
Keyword(s):  
Single Molecule ◽  
Magnetic Behavior ◽  
One Dimensional

By using a salen-type ligand and changing the reaction solvent, a series of NiII–LnIII complexes have been obtained and structurally and magnetically characterized.

scholarly journals Hopping and Flipping of RNA Polymerase on DNA during Recycling for Reinitiation after Intrinsic Termination in Bacterial Transcription

2021 ◽  
Vol 22 (5) ◽  
pp. 2398
Author(s):  
Wooyoung Kang ◽  
Seungha Hwang ◽  
Jin Young Kang ◽  
Changwon Kang ◽  
Sungchul Hohng
Keyword(s):  
Single Molecule ◽  
Transcription Initiation ◽  
Molecular Mechanisms ◽  
Facilitated Diffusion ◽  
One Dimensional ◽  
Bacterial Transcription ◽  
Fluorescence Measurements ◽  
Dimensional Diffusion ◽  
Single Molecule Studies ◽  
Hopping Diffusion

Two different molecular mechanisms, sliding and hopping, are employed by DNA-binding proteins for their one-dimensional facilitated diffusion on nonspecific DNA regions until reaching their specific target sequences. While it has been controversial whether RNA polymerases (RNAPs) use one-dimensional diffusion in targeting their promoters for transcription initiation, two recent single-molecule studies discovered that post-terminational RNAPs use one-dimensional diffusion for their reinitiation on the same DNA molecules. Escherichia coli RNAP, after synthesizing and releasing product RNA at intrinsic termination, mostly remains bound on DNA and diffuses in both forward and backward directions for recycling, which facilitates reinitiation on nearby promoters. However, it has remained unsolved which mechanism of one-dimensional diffusion is employed by recycling RNAP between termination and reinitiation. Single-molecule fluorescence measurements in this study reveal that post-terminational RNAPs undergo hopping diffusion during recycling on DNA, as their one-dimensional diffusion coefficients increase with rising salt concentrations. We additionally find that reinitiation can occur on promoters positioned in sense and antisense orientations with comparable efficiencies, so reinitiation efficiency depends primarily on distance rather than direction of recycling diffusion. This additional finding confirms that orientation change or flipping of RNAP with respect to DNA efficiently occurs as expected from hopping diffusion.

Inducing Single Molecule Magnetic Behavior in a [Co4O4] Cubane via a Pronounced Solvatomagnetic Effect

2014 ◽  
Vol 53 (6) ◽  
pp. 2976-2982 ◽  
Author(s):  
Felix J. Klinke ◽  
Animesh Das ◽  
Serhiy Demeshko ◽  
Sebastian Dechert ◽  
Franc Meyer
Keyword(s):  
Single Molecule ◽  
Magnetic Behavior

Magnetic behavior of nonet tetracarbene as a model for one-dimensional organic ferromagnets

1986 ◽  
Vol 108 (3) ◽  
pp. 368-371 ◽  
Author(s):  
Tadashi. Sugawara ◽  
Shunji. Bandow ◽  
Keisaku. Kimura ◽  
Hiizu. Iwamura ◽  
Koichi. Itoh
Keyword(s):  
Magnetic Behavior ◽  
One Dimensional ◽  
Organic Ferromagnets

Single-Molecule Magnetic Behavior in a Calix[8]arene-Capped Heterometallic {DyIII 4 CoII 4 } Square-Antiprismatic Cluster

2017 ◽  
Vol 2017 (41) ◽  
pp. 4879-4883 ◽  
Author(s):  
Haitao Han ◽  
Xiao-Lei Li ◽  
Xiaofei Zhu ◽  
Guoshuai Zhang ◽  
Xinxin Hang ◽  
...  
Keyword(s):  
Single Molecule ◽  
Magnetic Behavior

Quasi one-dimensional magnetic behavior of (C5H5NH)MnCl3 (PMCA) and (C5H5NH)NiCl3 (PNCA)

1980 ◽  
Vol 34 (8) ◽  
pp. 667-670 ◽  
Author(s):  
J.C. Schouten ◽  
H. Hadders ◽  
K. Kopinga ◽  
W.J.M. de Jonge
Keyword(s):  
Magnetic Behavior ◽  
One Dimensional

scholarly journals Bio-Molecular Applications of Recent Developments in Optical Tweezers

Biomolecules ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 23 ◽  
Author(s):  
Dhawal Choudhary ◽  
Alessandro Mossa ◽  
Milind Jadhav ◽  
Ciro Cecconi
Keyword(s):  
Photonic Crystal ◽  
Optical Tweezers ◽  
Single Molecule ◽  
Continuous Wave ◽  
Imaging Techniques ◽  
Resolving Power ◽  
Optical Traps ◽  
Laser Source ◽  
One Dimensional

In the past three decades, the ability to optically manipulate biomolecules has spurred a new era of medical and biophysical research. Optical tweezers (OT) have enabled experimenters to trap, sort, and probe cells, as well as discern the structural dynamics of proteins and nucleic acids at single molecule level. The steady improvement in OT’s resolving power has progressively pushed the envelope of their applications; there are, however, some inherent limitations that are prompting researchers to look for alternatives to the conventional techniques. To begin with, OT are restricted by their one-dimensional approach, which makes it difficult to conjure an exhaustive three-dimensional picture of biological systems. The high-intensity trapping laser can damage biological samples, a fact that restricts the feasibility of in vivo applications. Finally, direct manipulation of biological matter at nanometer scale remains a significant challenge for conventional OT. A significant amount of literature has been dedicated in the last 10 years to address the aforementioned shortcomings. Innovations in laser technology and advances in various other spheres of applied physics have been capitalized upon to evolve the next generation OT systems. In this review, we elucidate a few of these developments, with particular focus on their biological applications. The manipulation of nanoscopic objects has been achieved by means of plasmonic optical tweezers (POT), which utilize localized surface plasmons to generate optical traps with enhanced trapping potential, and photonic crystal optical tweezers (PhC OT), which attain the same goal by employing different photonic crystal geometries. Femtosecond optical tweezers (fs OT), constructed by replacing the continuous wave (cw) laser source with a femtosecond laser, promise to greatly reduce the damage to living samples. Finally, one way to transcend the one-dimensional nature of the data gained by OT is to couple them to the other large family of single molecule tools, i.e., fluorescence-based imaging techniques. We discuss the distinct advantages of the aforementioned techniques as well as the alternative experimental perspective they provide in comparison to conventional OT.

scholarly journals Bloch surface wave-coupled emission from quantum dots by ensemble and single molecule spectroscopy

RSC Advances ◽  
2015 ◽  
Vol 5 (67) ◽  
pp. 54403-54411 ◽  
Author(s):  
Krishanu Ray ◽  
Ramachandram Badugu ◽  
Joseph R. Lakowicz
Keyword(s):  
Quantum Dots ◽  
Photonic Crystal ◽  
Surface Wave ◽  
Single Molecule ◽  
Single Molecule Spectroscopy ◽  
One Dimensional ◽  
Fluorescence Studies ◽  
Emission Lifetime ◽  
Crystal Substrate ◽  
Bloch Surface Wave

Single particle fluorescence studies demonstrate increased brightness and reduced emission lifetime of individual QD575 on one-dimensional photonic crystal substrate.

Sign in / Sign up

Export Citation Format

Share Document