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Zhan-Qi Cao, Yi-Chuan Wang, Ai-Hua Zou, Gábor London, Qi Zhang, Chuan Gao, Da-Hui Qu
An acid/base responsive amphiphilic [2]rotaxane switch containing a hydrophilic macrocycle component and a hydrophobic terminal bulky group was prepared and characterized. The morphology of the supramolecular assemblies formed by the rotaxanes could be switched between spherical vesicles and worm-like micelles using acid/base stimuli, as confirmed by transmission electron microscopy (TEM).
July 19, 2017: Chemical Communications: Chem Comm
Mehdi Sadeghpour, Alan Veliz-Cuba, Gábor Orosz, Krešimir Josić, Matthew R Bennett
Synthetic microbial consortia are conglomerations of multiple strains of genetically engineered microbes programmed to cooperatively bring about population-level phenotypes. By coordinating their activity, the constituent strains can display emergent behaviors that are difficult to engineer into isogenic populations. To do so, strains are engineered to communicate with one another through intercellular signaling pathways. As a result, the regulatory networks that control gene transcription throughout the population are sensitive to the extracellular concentration of the signaling molecules, and hence the relative densities of constituent strains...
March 2017: Quantitative Biology
Farshad Meshkati, Henry Chien Fu
This corrects the article DOI: 10.1103/PhysRevE.90.063006.
June 2017: Physical Review. E
Eun-Jin Kim, Rainer Hollerbach
We propose a toy model for a cyclic order-disorder transition and introduce a geometric methodology to understand stochastic processes involved in transitions. Specifically, our model consists of a pair of forward and backward processes (FPs and BPs) for the emergence and disappearance of a structure in a stochastic environment. We calculate time-dependent probability density functions (PDFs) and the information length L, which is the total number of different states that a system undergoes during the transition...
June 2017: Physical Review. E
Jeong Oen Lee, Kwang-Wook Choi, Seon-Jin Choi, Min-Ho Kang, Min-Ho Seo, Il-Doo Kim, Kyoungsik Yu, Jun-Bo Yoon
We present a fast, energy-efficient nano-thermomechanical encoding scheme for digital information storage and retrieval. Digital encoding processes are conducted by the bistable electrothermal actuation of a scalable nanobridge device. The electrothermal energy is highly concentrated by enhanced electron/phonon scattering and heat insulation in a sub-100 nm metallic layer. The efficient conversion of electrothermal energy into mechanical strain allows digital switching and programming processes within 60 nanoseconds at 0...
July 14, 2017: ACS Nano
Fu-Juan Geng, De-Hong Wu, Lin Zhou, Ping-Ping Shi, Peng-Fei Li, Ji-Xing Gao, Xuan Zheng, Da-Wei Fu, Qiong Ye
A bistable optical-electrical duple switch belongs to a class of highly satisfying intelligent materials that can transform optical and electrical responses simultaneously in one device. A perovskite-type high-temperature phase transition compound with one-dimensional chain-like crystal structure, ([(CH3)3PCH2OCH3][PbBr3], 1), displays remarkable bistable photoluminescent-dielectric duple switching behaviors. The noteworthy order-disorder transition of the phosphonium cation and the motions of anions contribute to the phase transition, leading to the space group P21/c at a low temperature phase to C2/c at a high temperature phase...
July 12, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Giovanni Piantoni, Nico Romeijn, German Gomez-Herrero, Ysbrand D Van Der Werf, Eus J W Van Someren
Perception is strongly affected by the intrinsic state of the brain, which controls the propensity to either maintain a particular perceptual interpretation or switch to another. To understand the mechanisms underlying the spontaneous drive of the brain to explore alternative interpretations of unchanging stimuli, we repeatedly recorded high-density EEG after normal sleep and after sleep deprivation while participants observed a Necker cube image and reported the durations of the alternating representations of their bistable perception...
July 12, 2017: Scientific Reports
H Suchomel, S Brodbeck, T C H Liew, M Amthor, M Klaas, S Klembt, M Kamp, S Höfling, C Schneider
Microcavity exciton polaritons are promising candidates to build a new generation of highly nonlinear and integrated optoelectronic devices. Such devices range from novel coherent light emitters to reconfigurable potential landscapes for electro-optical polariton-lattice based quantum simulators as well as building blocks of optical logic architectures. Especially for the latter, the strongly interacting nature of the light-matter hybrid particles has been used to facilitate fast and efficient switching of light by light, something which is very hard to achieve with weakly interacting photons...
July 11, 2017: Scientific Reports
Simone Fabiano, Negar Sani, Jun Kawahara, Loïg Kergoat, Josefin Nissa, Isak Engquist, Xavier Crispin, Magnus Berggren
Poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) is an organic mixed ion-electron conducting polymer. The PEDOT phase transports holes and is redox-active, whereas the PSS phase transports ions. When PEDOT is redox-switched between its semiconducting and conducting state, the electronic and optical properties of its bulk are controlled. Therefore, it is appealing to use this transition in electrochemical devices and to integrate those into large-scale circuits, such as display or memory matrices...
June 2017: Science Advances
B von Boehn, R Imbihl
Traveling interface modulations have been observed in catalytic methanol oxidation on an unpromoted Rh(110) and a partially vanadium oxide covered (θV = 0.1 MLE) Rh(110) surface. The front instabilities have been followed with photoemission electron microscopy (PEEM) in the 10(-4) mbar range at T ≈ 800 K where the reaction is bistable. Near the equistability point large amplitude excursions (up to 300 μm) from the average interface position occur which travel in a pulse-like manner along the interface.
July 6, 2017: Physical Chemistry Chemical Physics: PCCP
Debabrata Biswas, Tanmoy Banerjee, Jürgen Kurths
Birhythmicity occurs in many natural and artificial systems. In this paper, we propose a self-feedback scheme to control birhythmicity. To establish the efficacy and generality of the proposed control scheme, we apply it on three birhythmic oscillators from diverse fields of natural science, namely, an energy harvesting system, the p53-Mdm2 network for protein genesis (the OAK model), and a glycolysis model (modified Decroly-Goldbeter model). Using the harmonic decomposition technique and energy balance method, we derive the analytical conditions for the control of birhythmicity...
June 2017: Chaos
Tao Han, Linlin Liu, Mingying Wei, Cong Wang, Xiaoyan Wu, Zengqi Xie, Yuguang Ma
Evaporated naked silver nanoparticles (Ag-NPs) were embedded in the isolated layer of PTB7-based organic field-effect transistors (OFETs), where their electric bistability behavior was successfully activated by photo-irradiation. These devices showed no obvious memory behavior in the dark; while under weak photo-irradiation (0.015 mW cm(-2)), memory windows of 12.5-35 V have been achieved. Different operation modes have been designed to exhibit the memory behavior and to explore the origin of the formation of a stable charge state...
July 21, 2017: Physical Chemistry Chemical Physics: PCCP
Wun-Sin Jhang, Shih-Chiang Lo, Chen-Chao Yeh, Che-Chi Shu
The cellular behaviors under the control of genetic circuits are subject to stochastic fluctuations, or noise. The stochasticity in gene regulation, far from a nuisance, has been gradually appreciated for its unusual function in cellular activities. In this work, with Chemical Master Equation (CME), we discovered that the addition of inhibitors altered the stochasticity of regulatory proteins. For a bistable system of a mutually inhibitory network, such a change of noise led to the migration of cells in the bimodal distribution...
June 30, 2017: Scientific Reports
J Kornmeier, E Friedel, M Wittmann, H Atmanspacher
The Necker-Zeno model of bistable perception provides a formal relation between the average duration of meta-stable percepts (dwell times T) of ambiguous figures and two other basic time scales (t0, ΔT) underlying cognitive processing. The model predicts that dwell times T covary with t0, ΔT or both. We tested this prediction by exploiting that observers, in particular experienced meditators, can volitionally control dwell times T. Meditators and non-meditators observed bistable Necker cubes either passively or tried to hold their current percept...
June 27, 2017: Consciousness and Cognition
João Valente Duarte, Gabriel Nascimento Costa, Ricardo Martins, Miguel Castelo-Branco
It remains an open question whether long-range disambiguation of ambiguous surface motion can be achieved in early visual cortex or instead in higher level regions, which concerns object/surface segmentation/integration mechanisms. We used a bistable moving stimulus that can be perceived as a pattern comprehending both visual hemi-fields moving coherently downward or as two widely segregated nonoverlapping component objects (in each visual hemi-field) moving separately inward. This paradigm requires long-range integration across the vertical meridian leading to interhemispheric binding...
June 28, 2017: Human Brain Mapping
James M Kunert-Graf, Eli Shlizerman, Andrew Walker, J Nathan Kutz
The neural dynamics of the nematode Caenorhabditis elegans are experimentally low-dimensional and may be understood as long-timescale transitions between multiple low-dimensional attractors. Previous modeling work has found that dynamic models of the worm's full neuronal network are capable of generating reasonable dynamic responses to certain inputs, even when all neurons are treated as identical save for their connectivity. This study investigates such a model of C. elegans neuronal dynamics, finding that a wide variety of multistable responses are generated in response to varied inputs...
2017: Frontiers in Computational Neuroscience
François-Xavier Coudert
Zeolitic Imidazolate Framework ZIF-8 displays flexibility of its framework by rotation of its imidazolate linker. This "swing effect" has been widely described in the literature, both experimental and theoretical, as a bistable system where the linker oscillates between two structures: "open window" and "closed window". By using quantum chemistry calculations and first principles molecular dynamics simulations, it is shown that the deformation upon adsorption is in fact continuous upon pore loading, with thermodynamics the reason behind stepped adsorption isotherms experimentally observed...
June 28, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Elisa Filevich, Maxi Becker, Yuan-Hao Wu, Simone Kühn
Ambiguous images such as Rubin's vase-face can be interpreted in at least two different ways. These interpretations are typically taken to be mutually exclusive, and ambiguous images have thus served as models of perceptual competition. Here, we present data that challenges this view. In an online survey, we found that a large proportion of people within the general population reported that the two percepts were not competing but could be perceived simultaneously. Of those who reported that they could see both percepts simultaneously, we invited 17 participants to take part in a functional magnetic resonance imaging (fMRI) experiment...
2017: Frontiers in Human Neuroscience
Andy Jenkins, Matthew Macauley
The lactose operon in Escherichia coli was the first known gene regulatory network, and it is frequently used as a prototype for new modeling paradigms. Historically, many of these modeling frameworks use differential equations. More recently, Stigler and Veliz-Cuba proposed a Boolean model that captures the bistability of the system and all of the biological steady states. In this paper, we model the well-known arabinose operon in E. coli with a Boolean network. This has several complex features not found in the lac operon, such as a protein that is both an activator and repressor, a DNA looping mechanism for gene repression, and the lack of inducer exclusion by glucose...
June 21, 2017: Bulletin of Mathematical Biology
Otto Hadač, František Muzika, Vladislav Nevoral, Michal Přibyl, Igor Schreiber
Prompted by the recent growing evidence of oscillatory behavior involving MAPK cascades we present a systematic approach of analyzing models and elucidating the nature of biochemical oscillations based on reaction network theory. In particular, we formulate a minimal biochemically consistent mass action subnetwork of the Huang-Ferrell model of the MAPK signalling that provides an oscillatory response when a parameter controlling the activation of the top-tier kinase is varied. Such dynamics are either intertwined with or separated from the earlier found bistable/hysteretic behavior in this model...
2017: PloS One
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