scholarly journals Electrochemically switchable rotaxanes: recent strides in new directions

2019 ◽  
Vol 10 (42) ◽  
pp. 9626-9639 ◽  
Author(s):  
Hendrik V. Schröder ◽  
Christoph A. Schalley
Keyword(s):  
Recent Progress ◽  
Molecular Machines ◽  
New Directions ◽  
Molecular Shuttles

Electrochemically controllable rotaxanes are prime examples of supramolecular switches and promising prototypes for artificial molecular machines. This perspective discusses recent progress and applications beyond classical molecular shuttles.

Dehydrogenation of light alkanes to mono-olefins

2021 ◽  
Vol 50 (7) ◽  
pp. 4359-4381
Author(s):  
Chunyi Li ◽  
Guowei Wang
Keyword(s):  
Recent Progress ◽  
Light Alkanes ◽  
Alkane Dehydrogenation ◽  
Light Alkane ◽  
New Directions

This review summarizes recent progress in the catalysts and reactors for light alkane dehydrogenation, providing new directions for dehydrogenation technologies.

Recent Developments in Artificial Molecular-Machine–Based Active Nanomaterials and Nanosystems

MRS Bulletin ◽  
2008 ◽  
Vol 33 (3) ◽  
pp. 226-231 ◽  
Author(s):  
Tony Jun Huang
Keyword(s):  
Single Molecule ◽  
Interdisciplinary Research ◽  
Recent Progress ◽  
High Strain ◽  
Molecular Machines ◽  
High Impact ◽  
Molecular Machine ◽  
Mechanical Motion ◽  
Structures And Properties ◽  
Recent Developments

AbstractArtificial molecular machines capable of converting chemical, electrochemical, and photochemical energy into mechanical motion represent a high-impact, fast-growing field of interdisciplinary research. These molecular-scale systems utilize a “bottom-up” technology centered upon the design and manipulation of molecular assemblies and are potentially capable of delivering efficient actuation at length scales dramatically smaller than traditional microscale actuators. As actuation materials, molecular machines have many advantages, such as high strain (40%–60%), high force and energy densities, and the capability to maintain their actuation properties from the level of a single molecule to the macroscale. These advantages have inspired researchers to develop molecular-machine–based active nanomaterials and nanosystems, including electroactive and photoactive polymers. This article will discuss the structures and properties of artificial molecular machines, as well as review recent progress on efforts to move molecular machines from solution to surfaces to devices.

Structural Mechanisms for Replicating DNA in Eukaryotes

2021 ◽  
Vol 90 (1) ◽  
Author(s):  
Ilan Attali ◽  
Michael R. Botchan ◽  
James M. Berger
Keyword(s):  
Nucleic Acid ◽  
Online Publication ◽  
Recent Progress ◽  
Molecular Machines ◽  
Cellular Process ◽  
Annual Review ◽  
Publication Date ◽  
Working Together ◽  
Protein Nucleic Acid ◽  
Structural Mechanisms

The faithful and timely copying of DNA by molecular machines known as replisomes depends on a disparate suite of enzymes and scaffolding factors working together in a highly orchestrated manner. Large, dynamic protein–nucleic acid assemblies that selectively morph between distinct conformations and compositional states underpin this critical cellular process. In this article, we discuss recent progress outlining the physical basis of replisome construction and progression in eukaryotes. Expected final online publication date for the Annual Review of Biochemistry, Volume 90 is June 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

scholarly journals Dynamics of Phononic Materials and Structures: Historical Origins, Recent Progress, and Future Outlook

2014 ◽  
Vol 66 (4) ◽  
Author(s):  
Mahmoud I. Hussein ◽  
Michael J. Leamy ◽  
Massimo Ruzzene
Keyword(s):  
Recent Progress ◽  
Structural System ◽  
Electronic Band ◽  
Dynamical Characteristics ◽  
Constituent Material ◽  
New Directions ◽  
Experimental Approaches ◽  
Historical Developments ◽  
Ribbed Shells

The study of phononic materials and structures is an emerging discipline that lies at the crossroads of vibration and acoustics engineering and condensed matter physics. Broadly speaking, a phononic medium is a material or structural system that usually exhibits some form of periodicity, which can be in the constituent material phases, or the internal geometry, or even the boundary conditions. As such, its overall dynamical characteristics are compactly described by a frequency band structure, in analogy to an electronic band diagram. With roots extended to early studies of periodic systems by Newton and Rayleigh, the field has grown to encompass engineering configurations ranging from trusses and ribbed shells to phononic crystals and metamaterials. While applied research in this area has been abundant in recent years, treatment from a fundamental mechanics perspective, and particularly from the standpoint of dynamical systems, is needed to advance the field in new directions. For example, techniques already developed for the incorporation of damping and nonlinearities have recently been applied to wave propagation in phononic materials and structures. Similarly, numerical and experimental approaches originally developed for the characterization of conventional materials and structures are now being employed toward better understanding and exploitation of phononic systems. This article starts with an overview of historical developments and follows with an in-depth literature and technical review of recent progress in the field with special consideration given to aspects pertaining to the fundamentals of dynamics, vibrations, and acoustics. Finally, an outlook is projected onto the future on the basis of the current trajectories of the field.

Amide-based molecular shuttles (2001-2006)

2007 ◽  
Vol 79 (1) ◽  
pp. 39-54 ◽  
Author(s):  
José Berná ◽  
Giovanni Bottari ◽  
David A. Leigh ◽  
Emilio M. Pérez
Keyword(s):  
Molecular Machines ◽  
Stimuli Responsive ◽  
Short Period ◽  
Molecular Shuttles

Stimuli-responsive molecular shuttles are rotaxanes in which the macrocycle can be translocated from one position on the thread to a second site in response to an external trigger. Here, we present a brief overview of the contributions of the Leigh group to the field from 2001 to 2006. In this short period of time, molecular shuttles have moved from little more than laboratory curiosities to truly functional molecular machines.

scholarly journals Chromatin remodelling comes into focus

F1000Research ◽  
2020 ◽  
Vol 9 ◽  
pp. 1011
Author(s):  
Ramasubramian Sundaramoorthy ◽  
Tom Owen-Hughes
Keyword(s):  
Recent Progress ◽  
Molecular Machines ◽  
Chromatin Remodelling ◽  
Contact Dna

ATP-dependent chromatin remodelling enzymes are molecular machines that act to reconfigure the structure of nucleosomes. Until recently, little was known about the structure of these enzymes. Recent progress has revealed that their interaction with chromatin is dominated by ATPase domains that contact DNA at favoured locations on the nucleosome surface. Contacts with histones are limited but play important roles in modulating activity. The ATPase domains do not act in isolation but are flanked by diverse accessory domains and subunits. New structures indicate how these subunits are arranged in multi-subunit complexes providing a framework from which to understand how a common motor is applied to distinct functions.

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