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Nature Nanotechnology

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https://www.readbyqxmd.com/read/29133926/genetic-programs-can-be-compressed-and-autonomously-decompressed-in-live-cells
#1
Nicolas Lapique, Yaakov Benenson
Fundamental computer science concepts have inspired novel information-processing molecular systems in test tubes (1-13) and genetically encoded circuits in live cells (14-21) . Recent research has shown that digital information storage in DNA, implemented using deep sequencing and conventional software, can approach the maximum Shannon information capacity (22) of two bits per nucleotide (23) . In nature, DNA is used to store genetic programs, but the information content of the encoding rarely approaches this maximum (24) ...
November 13, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/29109539/controllable-molecular-motors-engineered-from-myosin-and-rna
#2
Tosan Omabegho, Pinar S Gurel, Clarence Y Cheng, Laura Y Kim, Paul V Ruijgrok, Rhiju Das, Gregory M Alushin, Zev Bryant
Engineering biomolecular motors can provide direct tests of structure-function relationships and customized components for controlling molecular transport in artificial systems (1) or in living cells (2) . Previously, synthetic nucleic acid motors (3-5) and modified natural protein motors (6-10) have been developed in separate complementary strategies to achieve tunable and controllable motor function. Integrating protein and nucleic-acid components to form engineered nucleoprotein motors may enable additional sophisticated functionalities...
November 6, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/29062066/electric-polarization-switching-in-an-atomically-thin-binary-rock-salt-structure
#3
LETTER
Jose Martinez-Castro, Marten Piantek, Sonja Schubert, Mats Persson, David Serrate, Cyrus F Hirjibehedin
Inducing and controlling electric dipoles is hindered in the ultrathin limit by the finite screening length of surface charges at metal-insulator junctions (1-3) , although this effect can be circumvented by specially designed interfaces (4) . Heterostructures of insulating materials hold great promise, as confirmed by perovskite oxide superlattices with compositional substitution to artificially break the structural inversion symmetry (5-8) . Bringing this concept to the ultrathin limit would substantially broaden the range of materials and functionalities that could be exploited in novel nanoscale device designs...
October 23, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/29035400/protein-recognition-by-a-pattern-generating-fluorescent-molecular-probe
#4
Zohar Pode, Ronny Peri-Naor, Joseph M Georgeson, Tal Ilani, Vladimir Kiss, Tamar Unger, Barak Markus, Haim M Barr, Leila Motiei, David Margulies
Fluorescent molecular probes have become valuable tools in protein research; however, the current methods for using these probes are less suitable for analysing specific populations of proteins in their native environment. In this study, we address this gap by developing a unimolecular fluorescent probe that combines the properties of small-molecule-based probes and cross-reactive sensor arrays (the so-called chemical 'noses/tongues'). On the one hand, the probe can detect different proteins by generating unique identification (ID) patterns, akin to cross-reactive arrays...
October 16, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/29035399/towards-zero-threshold-optical-gain-using-charged-semiconductor-quantum-dots
#5
Kaifeng Wu, Young-Shin Park, Jaehoon Lim, Victor I Klimov
Colloidal semiconductor quantum dots are attractive materials for the realization of solution-processable lasers. However, their applications as optical-gain media are complicated by a non-unity degeneracy of band-edge states, because of which multiexcitons are required to achieve the lasing regime. This increases the lasing thresholds and leads to very short optical gain lifetimes limited by nonradiative Auger recombination. Here, we show that these problems can be at least partially resolved by employing not neutral but negatively charged quantum dots...
October 16, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28991242/hot-carrier-enhanced-interlayer-electron-hole-pair-multiplication-in-2d-semiconductor-heterostructure-photocells
#6
Fatemeh Barati, Max Grossnickle, Shanshan Su, Roger K Lake, Vivek Aji, Nathaniel M Gabor
Strong electronic interactions can result in novel particle-antiparticle (electron-hole, e-h) pair generation effects, which may be exploited to enhance the photoresponse of nanoscale optoelectronic devices. Highly efficient e-h pair multiplication has been demonstrated in several important nanoscale systems, including nanocrystal quantum dots, carbon nanotubes and graphene. The small Fermi velocity and nonlocal nature of the effective dielectric screening in ultrathin layers of transition-metal dichalcogenides (TMDs) indicates that e-h interactions are very strong, so high-efficiency generation of e-h pairs from hot electrons is expected...
October 9, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28991241/multifunctional-high-performance-van-der-waals-heterostructures
#7
Mingqiang Huang, Shengman Li, Zhenfeng Zhang, Xiong Xiong, Xuefei Li, Yanqing Wu
A range of novel two-dimensional materials have been actively explored for More Moore and More-than-Moore device applications because of their ability to form van der Waals heterostructures with unique electronic properties. However, most of the reported electronic devices exhibit insufficient control of multifunctional operations. Here, we leverage the band-structure alignment properties of narrow-bandgap black phosphorus and large-bandgap molybdenum disulfide to realize vertical heterostructures with an ultrahigh rectifying ratio approaching 10(6) and on-off ratio up to 10(7)...
October 9, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28967894/inner-and-outer-wall-sorting-of-double-walled-carbon-nanotubes
#8
Han Li, Georgy Gordeev, Sören Wasserroth, Venkata Sai Kiran Chakravadhanula, Shyam Kumar Chethala Neelakandhan, Frank Hennrich, Ado Jorio, Stephanie Reich, Ralph Krupke, Benjamin Scott Flavel
Double-walled carbon nanotubes (DWCNTs) consist of two coaxially aligned single-walled carbon nanotubes (SWCNTs), and previous sorting methods only achieved outer-wall electronic-type selectivity. Here, a separation technique capable of sorting DWCNTs by semiconducting (S) or metallic (M) inner- and outer-wall electronic type is presented. Electronic coupling between the inner and outer wall is used to alter the surfactant coating around each of the DWCNT types, and aqueous gel permeation is used to separate them...
October 2, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28967893/a-synthetic-intrabody-based-selective-and-generic-inhibitor-of-gpcr-endocytosis
#9
Eshan Ghosh, Ashish Srivastava, Mithu Baidya, Punita Kumari, Hemlata Dwivedi, Kumari Nidhi, Ravi Ranjan, Shalini Dogra, Akiko Koide, Prem N Yadav, Sachdev S Sidhu, Shohei Koide, Arun K Shukla
Beta-arrestins (βarrs) critically mediate desensitization, endocytosis and signalling of G protein-coupled receptors (GPCRs), and they scaffold a large number of interaction partners. However, allosteric modulation of their scaffolding abilities and direct targeting of their interaction interfaces to modulate GPCR functions selectively have not been fully explored yet. Here we identified a series of synthetic antibody fragments (Fabs) against different conformations of βarrs from phage display libraries. Several of these Fabs allosterically and selectively modulated the interaction of βarrs with clathrin and ERK MAP kinase...
October 2, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28945241/single-molecule-dna-sequencing-getting-to-the-bottom-of-the-well
#10
Hagan Bayley
No abstract text is available yet for this article.
September 25, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28920964/directed-emission-of-cdse-nanoplatelets-originating-from-strongly-anisotropic-2d-electronic-structure
#11
Riccardo Scott, Jan Heckmann, Anatol V Prudnikau, Artsiom Antanovich, Aleksandr Mikhailov, Nina Owschimikow, Mikhail Artemyev, Juan I Climente, Ulrike Woggon, Nicolai B Grosse, Alexander W Achtstein
Intrinsically directional light emitters are potentially important for applications in photonics including lasing and energy-efficient display technology. Here, we propose a new route to overcome intrinsic efficiency limitations in light-emitting devices by studying a CdSe nanoplatelets monolayer that exhibits strongly anisotropic, directed photoluminescence. Analysis of the two-dimensional k-space distribution reveals the underlying internal transition dipole distribution. The observed directed emission is related to the anisotropy of the electronic Bloch states governing the exciton transition dipole moment and forming a bright plane...
September 18, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28892102/length-independent-dna-packing-into-nanopore-zero-mode-waveguides-for-low-input-dna-sequencing
#12
Joseph Larkin, Robert Y Henley, Vivek Jadhav, Jonas Korlach, Meni Wanunu
Compared with conventional methods, single-molecule real-time (SMRT) DNA sequencing exhibits longer read lengths than conventional methods, less GC bias, and the ability to read DNA base modifications. However, reading DNA sequence from sub-nanogram quantities is impractical owing to inefficient delivery of DNA molecules into the confines of zero-mode waveguides-zeptolitre optical cavities in which DNA sequencing proceeds. Here, we show that the efficiency of voltage-induced DNA loading into waveguides equipped with nanopores at their floors is five orders of magnitude greater than existing methods...
September 11, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/29109549/high-performance-semiconductor-quantum-dot-single-photon-sources
#13
REVIEW
Pascale Senellart, Glenn Solomon, Andrew White
Single photons are a fundamental element of most quantum optical technologies. The ideal single-photon source is an on-demand, deterministic, single-photon source delivering light pulses in a well-defined polarization and spatiotemporal mode, and containing exactly one photon. In addition, for many applications, there is a quantum advantage if the single photons are indistinguishable in all their degrees of freedom. Single-photon sources based on parametric down-conversion are currently used, and while excellent in many ways, scaling to large quantum optical systems remains challenging...
November 7, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/29109548/how-to-build-an-educational-bridge
#14
Pierfrancesco Riccardi, Claudio Goletti
No abstract text is available yet for this article.
November 7, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/29109547/skin-to-e-skin
#15
EDITORIAL
(no author information available yet)
No abstract text is available yet for this article.
November 7, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28967892/emulsions-simple-shaking-yields-bicontinuity
#16
Ali Mohraz
No abstract text is available yet for this article.
November 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28967891/field-free-deterministic-ultrafast-creation-of-magnetic-skyrmions-by-spin-orbit-torques
#17
Felix Büttner, Ivan Lemesh, Michael Schneider, Bastian Pfau, Christian M Günther, Piet Hessing, Jan Geilhufe, Lucas Caretta, Dieter Engel, Benjamin Krüger, Jens Viefhaus, Stefan Eisebitt, Geoffrey S D Beach
Magnetic skyrmions are stabilized by a combination of external magnetic fields, stray field energies, higher-order exchange interactions and the Dzyaloshinskii-Moriya interaction (DMI). The last favours homochiral skyrmions, whose motion is driven by spin-orbit torques and is deterministic, which makes systems with a large DMI relevant for applications. Asymmetric multilayers of non-magnetic heavy metals with strong spin-orbit interactions and transition-metal ferromagnetic layers provide a large and tunable DMI...
November 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28945242/bicontinuous-structured-liquids-with-sub-micrometre-domains-using-nanoparticle-surfactants
#18
Caili Huang, Joe Forth, Weiyu Wang, Kunlun Hong, Gregory S Smith, Brett A Helms, Thomas P Russell
Bicontinuous jammed emulsions (or bijels) are tortuous, interconnected structures of two immiscible liquids, kinetically trapped by colloidal particles that are irreversibly bound to the oil-water interface. A wealth of applications has been proposed for bijels in catalysis, energy storage and molecular encapsulation, but large domain sizes (on the order of 5 µm or larger) and difficulty in fabrication pose major barriers to their use. Here, we show that bijels with sub-micrometre domains can be formed via homogenization, rather than spinodal decomposition...
November 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28945240/atomically-precise-graphene-nanoribbon-heterojunctions-from-a-single-molecular-precursor
#19
Giang D Nguyen, Hsin-Zon Tsai, Arash A Omrani, Tomas Marangoni, Meng Wu, Daniel J Rizzo, Griffin F Rodgers, Ryan R Cloke, Rebecca A Durr, Yuki Sakai, Franklin Liou, Andrew S Aikawa, James R Chelikowsky, Steven G Louie, Felix R Fischer, Michael F Crommie
The rational bottom-up synthesis of atomically defined graphene nanoribbon (GNR) heterojunctions represents an enabling technology for the design of nanoscale electronic devices. Synthetic strategies used thus far have relied on the random copolymerization of two electronically distinct molecular precursors to yield GNR heterojunctions. Here we report the fabrication and electronic characterization of atomically precise GNR heterojunctions prepared through late-stage functionalization of chevron GNRs obtained from a single precursor...
November 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28945239/focal-molography-is-a-new-method-for-the-in-situ-analysis-of-molecular-interactions-in-biological-samples
#20
Volker Gatterdam, Andreas Frutiger, Klaus-Peter Stengele, Dieter Heindl, Thomas Lübbers, Janos Vörös, Christof Fattinger
Focal molography is a next-generation biosensor that visualizes specific biomolecular interactions in real time. It transduces affinity modulation on the sensor surface into refractive index modulation caused by target molecules that are bound to a precisely assembled nanopattern of molecular recognition sites, termed the 'mologram'. The mologram is designed so that laser light is scattered at specifically bound molecules, generating a strong signal in the focus of the mologram via constructive interference, while scattering at nonspecifically bound molecules does not contribute to the effect...
November 2017: Nature Nanotechnology
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