bluuebunny/crossref_metadata_2025_split huggingface dataset:
P
olynucleobacter
Authors: Hahn Martin W. , Hoetzinger Matthias 
Published: March 2019

Abstract

Po.ly.nu.cle.o.bac'ter. Gr. adj.
polys,
many, numerous; L. masc. n.
nucleus,
a little nut, kernel; N.L. masc. n.
bacter,
a rod; N.L. masc. n.
polynucleobacter,
the rod (bacterium) with many nucleoids.

Proteobacteria / Betaproteobacteria / Burkholderiales / Burkholderiaceae / Polynucleobacter

The genus
Polynucleobacter
harbors bacteria with distinct lifestyles, dwelling either as free‐living organisms contributing to bacterioplankton in the water columns of freshwater systems or as obligate endosymbionts in the cytoplasm of ciliates (
Euplotes
). Obligate endosymbionts represent derived evolutionary stages of the primary free‐living strains.
Polynucleobacter
bacteria are cosmopolitan and ubiquitous in freshwater systems, which means, they dwell in freshwater systems worldwide and are omnipresent at least in lakes and ponds but frequently also dwell in running waters. Planktonic
Polynucleobacter
are abundant in many lakes and ponds, especially in acidic waters. Investigations on a broad variety of systems reported relative abundances of
Polynucleobacter
bacteria in the range of <1% up to 60% of bacterioplankton. The strains are usually characterized by small genomes of 1.5–2.5 Mb with medium G + C contents of 40–50 mol%. Cultivated strains require complex media and grow as aerobic chemoorganoheterotrophs; however, some strains contain genes putatively encoding anoxygenic photosynthesis or proteorhodopsins. Free‐living strains form small circular convex colonies with shiny surface on agar plates, and usually lack pigmentation. The majority of strains are characterized by small cell sizes and appear as curved or straight rods. Currently (August 2018), the genus contains 16 described species including one endosymbiotic taxon.

DNA G + C content
of
P. necessarius
47.7 mol% (melting point profile) and 44.9 mol% (buoyant density).

Type species
:
Polynucleobacter necessarius
Heckmann and Schmidt 1987, 457
VP
.
Autobiographical memory and autobiographical narrative of a staged event: The influence of the listener
Authors: Elmi Benedetta , Bartoli Eleonora , Smorti Andrea 
Published: March 2019

SummaryThe purpose of the present study was to investigate the role of narration and listening conditions in autobiographical memory of a staged event. Eighty young adults were recruited for the present research. First, they were interviewed on current issues (staged event). Second, they were asked to complete a memory questionnaire about the content of the interview. Then, they were assigned to three retrieval conditions: narration to an empathic listener, narration to a detached listener, and retrieving thinking silently about the event. Finally, 1 week later, the participants were asked to complete the memory questionnaire again to assess the influence of narration and listening conditions on memory. The results show that the experimental conditions significantly influenced the memory trend for a staged event. The emphatic listening condition promoted memory significantly more than did the other two conditions. The authors interpret these results in terms of the theory of narrativization.
Hydrophilic Doped Quantum Dots “Ink” and Their Inkjet‐Printed Patterns for Dual Mode Anticounterfeiting by Reversible Cation Exchange Mechanism
Authors: Huang Wenyi , Xu Meng , Liu Jiajia , Wang Jingyu , Zhu Yibin , Liu Jia , Rong Hongpan , Zhang Jiatao 
Published: March 2019

AbstractLuminescent quantum dots (QDs) patterns have attracted great attention in anticounterfeiting applications because they can emit fluorescence upon excitation. Here, different from traditional luminescent patterns for anticounterfeiting purposes, a novel strategy based on the reversible cation exchange enabled Ag doped CdS quantum dots (CdS:Ag QDs) is reported to provide a higher security for anticounterfeiting. First, the reversibility of cation exchange enabled doped QDs crystal engineering have been revealed. The switch from nonluminescence to luminescence for several cycles by such a mechanism has been achieved. Second, the hydrophilic doped QDs “ink” can be prepared by surface modification, and then flexible bulk‐sized patterns can be printed on different substrates by inkjet printing technology, such as the parchment paper, PET foil, and paper currency substrates. Third, owing to the characteristic of stable crystal structure of CdS:Ag QDs, the patterns of such doped QDs on substrates can be switched by in situ cation exchange to achieve conversion of the disappearance and recovery of luminescent signals, from which a multiple dual mode anticounterfeiting verification can be provided.
Polyhedral Liquid Marbles
Authors: Geyer Florian , Asaumi Yuta , Vollmer Doris , Butt Hans‐Jürgen , Nakamura Yoshinobu , Fujii Syuji 
Published: March 2019

AbstractA new type of armored droplet, a so‐called polyhedral liquid marble, is introduced in this work. These armored liquid marbles consist of liquid droplets stabilized by hydrophobic hexagonal plates made of poly(ethylene terephthalate), which adsorb to the liquid–air interface. Depending on the specific combination of plate size and droplet diameter, the plates self‐assemble into highly ordered hexagonally arranged domains. Even tetrahedral‐, pentahedral‐, and cube‐shaped liquid marbles composed of only 4 to 6 plates are demonstrated. During evaporation of the internal liquid, due to the high adsorption energy of the plates at the liquid–air interface, the overall surface area stays constant, resulting in strongly deformed polyhedral liquid marbles. In line with this, highly asymmetric polyhedral liquid marbles and letters are obtained due to the strong interfacial jamming exerted by the rigid hexagonal plates. This is particularly pronounced for larger plate sizes, leading to liquid marbles with unusually sharp edges (for example, rectangular edges). The polyhedral liquid marbles exhibit various stimuli‐responsive behaviors simultaneously being exposed to water, ammonia, or tetrahydrofuran vapors. Air‐driven polyhedral liquid marbles floating on water can reach velocities of several centimeters per second.
Scalable Synthesis of Ultrathin Mn3N2 Exhibiting Room‐Temperature Antiferromagnetism
Authors: Xiao Xu , Urbankowski Patrick , Hantanasirisakul Kanit , Yang Yao , Sasaki Stephen , Yang Long , Chen Chi , Wang Hao , Miao Ling , Tolbert Sarah H. , Billinge Simon J. L. , Abruña Héctor D. , May Steven J. , Gogotsi Yury 
Published: March 2019

AbstractUltrathin and 2D magnetic materials have attracted a great deal of attention recently due to their potential applications in spintronics. Only a handful of stable ultrathin magnetic materials have been reported, but their high‐yield synthesis remains a challenge. Transition metal (e.g., manganese) nitrides are attractive candidates for spintronics due to their predicted high magnetic transition temperatures. Here, a lattice matching synthesis of ultrathin Mn3N2 is employed. Taking advantage of the lattice match between a KCl salt template and Mn3N2, this method yields the first ultrathin magnetic metal nitride via a solution‐based route. Mn3N2 flakes show intrinsic magnetic behavior even at 300 K, enabling potential room‐temperature applications. This synthesis procedure offers an approach to the discovery of other ultrathin or 2D metal nitrides.
Propranolol‐Loaded Mesoporous Silica Nanoparticles for Treatment of Infantile Hemangiomas
Authors: Wu Haiwei , Wang Xuan , Zheng Jiawei , Zhang Ling , Li Xiaoming , Yuan Wei‐En , Liu Xuejian 
Published: March 2019

AbstractInfantile hemangioma (IH) is one of the most common neoplasm of infancy. Although with the potential to involute slowly after proliferation, IH has several subsets that could develop severe complications and lead to functional impairment or permanent disfigurement. In the present study, a novel propranolol (PRN) delivery system is developed that encapsulated in mesoporous silica nanoparticles (MSN). The primary nanoparticles are further treated with polyvinyl alcohol (PVA) to form PVA‐MSN‐PRN nanoparticles. The encapsulation efficiency is 58.8% ± 7.2%, and nanoparticles could release PRN in a controlled‐release way. It is discovered that PVA‐MSN‐PRN could significantly suppress hemangioma stem cell (Hemsc) proliferation, promote Hemsc apoptosis in vitro, and inhibit the growth of hemangiomain xenografts in vivo. A conclusion could be made that this novel nanodrug delivery system has high therapeutic efficacy, low cytotoxicity, low administration frequency, and provides an attractive strategy for efficient IH therapy.
Fabrication of a Biocompatible Liquid Crystal Graphene Oxide–Gold Nanorods Electro‐ and Photoactive Interface for Cell Stimulation
Authors: Duc Daniela , Stoddart Paul R. , McArthur Sally L. , Kapsa Robert M. I. , Quigley Anita F. , Boyd‐Moss Mitchell , Moulton Simon E. 
Published: March 2019

AbstractFor decades, electrode–tissue interfaces are pursued to establish electrical stimulation as a reliable means to control neuronal cells behavior. However, spreading of electrical currents in tissues limits its spatial precision. Thus, optical cues, such as near‐infrared (NIR) light, are explored as alternatives. Presently, NIR stimulation requires higher energy input than electrical methods despite introduction of light absorbers, e.g., gold nanoparticles. As potential solution, NIR and electrical costimulation are proposed but with limited interfaces capable of sustaining this stimulation technique. Here, a novel electroactive nanocomposite with photoactive properties in the NIR range is constructed by N‐(3‐dimethylaminopropyl)‐N′‐ethylcarbodiimide hydrochloride/N‐hydroxysulfosuccinimide sodium (EDC)/NHS conjugation of liquid crystal graphene oxide (LCGO) to protein‐coated gold nanorods (AuNR). The liquid crystal graphene oxide–gold nanorod nanocomposite (LCGO–AuNR) is fabricated into a hydrophilic electrode‐coating via drop‐casting, making it appropriate for versatile electrode–tissue interface fabrication. UV–vis spectrophotometry results demonstrate that LCGO–AuNR presents an absorbance peak at 798 nm (NIR range). Cyclic voltammetry measurements further confirm its electroactive capacitive properties. Furthermore, LCGO–AuNR coating supports cell adhesion, proliferation, and differentiation of NG108‐15 neuronal cells. This biocompatible interface is anticipated, with ideal electrical and optical properties for NIR and electrical costimulation, to enable further development of the technique for energy‐efficient and precise neuronal cell modulation.
Cell and Material‐Specific Phage Display Peptides Increase iPS‐MSC Mediated Bone and Vasculature Formation In Vivo
Authors: Ramaraju Harsha , Kohn David H. 
Published: March 2019

AbstractBiomimetically designed materials matching the chemical and mechanical properties of tissue support higher mesenchymal stem cell (MSC) adhesion. However, directing cell‐specific attachment and ensuring uniform cell distribution within the interior of 3D biomaterials remain key challenges in healing critical sized defects. Previously, a phage display derived MSC‐specific peptide (DPIYALSWSGMA, DPI) was combined with a mineral binding sequence (VTKHLNQISQSY, VTK) to increase the magnitude and specificity of MSC attachment to calcium‐phosphate biomaterials in 2D. This study investigates how DPI‐VTK influences quantity and uniformity of iPS‐MSC mediated bone and vasculature formation in vivo. There is greater bone formation in vivo when iPS‐MSCs are transplanted on bone‐like mineral (BLM) constructs coated with DPI‐VTK compared to VTK (p < 0.002), uncoated BLM (p < 0.037), acellular BLM/DPI‐VTK (p < 0.003), and acellular BLM controls (p < 0.01). This study demonstrates, for the first time, the ability of non‐native phage‐display designed peptides to spatially control uniform cell distribution on 3D scaffolds and increase the magnitude and uniformity of bone and vasculature formation in vivo. Taken together, the study validates phage display as a novel technology platform to engineer non‐native peptides with the ability to drive cell specific attachment on biomaterials, direct bone regeneration, and engineer uniform vasculature in vivo.
Electrochemically Controlled Drug Release from a Conducting Polymer Hydrogel (PDMAAp/PEDOT) for Local Therapy and Bioelectronics
Authors: Kleber Carolin , Lienkamp Karen , Rühe Jürgen , Asplund Maria 
Published: March 2019

AbstractIn this study, the release of fluorescein from a photo‐crosslinked conducting polymer hydrogel made from a hydrogel precursor poly(dimethylacrylamide‐co‐4‐methacryloyloxy benzophenone (5%)‐co‐4‐styrenesulfonate (2.5%)) (PDMAAp) and the conducting polymer poly(3,4‐ethylenedioxythiophene) (PEDOT) is investigated. Fluorescein, here used as a model for a drug, is actively released through application of an electrical trigger signal. The detected quantity is more than six times higher in comparison to that released from a conventional PEDOT/polysterene sulfonate (PSS) system. Release profiles, drug dose, and timing can be tailored by the application of different trigger signals and pretreatments. To demonstrate that the novel drug release system can be used for a drug relevant for local delivery to a neural interface, experiments are furthermore performed with the anti‐inflammatory drug dexamethasone (Dex). The conducting polymer hydrogel facilitates the active release of Dex, in comparison to the previously used PEDOT/Dex. It is suggested that PEDOT/PDMAAp is an interesting alternative for conducting polymer based drug release systems, with the potential to offer more volume for storage, yet retaining the excellent electrochemical properties known for PEDOT electrodes.
Design, Formulation, and Evaluation of Novel Dissolving Microarray Patches Containing Rilpivirine for Intravaginal Delivery
Authors: Mc Crudden Maelíosa T. C. , Larrañeta Eneko , Clark Annie , Jarrahian Courtney , Rein‐Weston Annie , Creelman Benjamin , Moyo Yolanda , Lachau‐Durand Sophie , Niemeijer Nico , Williams Peter , McCarthy Helen O. , Zehrung Darin , Donnelly Ryan F. 
Published: March 2019

AbstractAntiretroviral (ARV) drugs have, for many years, been studied and administered in the prevention and treatment of human immunodeficiency virus (HIV). Intramuscular (IM) injection of long acting (LA) ARVs are in clinical development, but injectable formulations require regular access to healthcare facilities and disposal facilities for sharps. The development of a discrete, self‐administered, and self‐disabling vehicle to deliver ARVs could obviate these issues. This study describes the formulation, mechanical characterization, and in vivo evaluation of dissolving microarray patches (MAPs) containing a LA nanosuspension of the ARV, rilpivirine (RPV, RPV LA), for vaginal delivery. This is the first study to apply MAPs into vaginal tissue. The RPV LA MAPs penetrate ex vivo skin and a synthetic vaginal skin model and withstand the effects of potential dragging motion across synthetic vaginal epithelium. In in vivo studies, the mean plasma concentration of RPV in rats at the 56 day endpoint (116.5 ng mL−1) is comparable to that achieved in the IM control cohort (118.9 ng mL−1). RPV is detected systemically, in lymph and vaginal tissue, indicating the potential to deliver RPV LA to primary sites of viral challenge and replication. This innovative research has future potential for patients and healthcare workers, particularly in low‐resource settings.
Physical Structuring of Injectable Polymeric Systems to Controllably Deliver Nanosized Extracellular Vesicles
Authors: Nikravesh Niusha , Davies Owen G. , Azoidis Ioannis , Moakes Richard J. A. , Marani Lucia , Turner Mark , Kearney Cathal J. , Eisenstein Neil M. , Grover Liam M. , Cox Sophie C. 
Published: March 2019

AbstractExtracellular vesicles (EVs) are emerging as a promising alternative approach to cell‐therapies. However, to realize the potential of these nanoparticles as new regenerative tools, healthcare materials that address the current limitations of systemic administration need to be developed. Here, two technologies for controlling the structure of alginate based microgel suspensions are used to develop sustained local release of EVs, in vitro. Microparticles formed using a shearing technique are compared to those manufactured using vibrational technology, resulting in either anisotropic sheet‐like or spheroid particles, respectively. EVs harvested from preosteoblasts are isolated using differential ultracentrifugation and successfully loaded into the two systems, while maintaining their structures. Promisingly, in addition to exhibiting even EV distribution and high stability, controlled release of vesicles from both structures is exhibited, in vitro, over the 12 days studied. Interestingly, a significantly greater number of EVs are released from the suspensions formed by shearing (69.9 ± 10.5%), compared to the spheroids (35.1 ± 7.6%). Ultimately, alterations to the hydrogel physical structures have shown to tailor nanoparticle release while simultaneously providing ideal material characteristics for clinical injection. Thus, the sustained release mechanisms achieved through manipulating the formation of such biomaterials provide a key to unlocking the therapeutic potential held within EVs.
3D Bioprinting of Functional Islets of Langerhans in an Alginate/Methylcellulose Hydrogel Blend
Authors: Duin Sarah , Schütz Kathleen , Ahlfeld Tilman , Lehmann Susann , Lode Anja , Ludwig Barbara , Gelinsky Michael 
Published: March 2019

AbstractTransplantation of pancreatic islets is a promising strategy to alleviate the unstable blood‐glucose control that some patients with diabetes type 1 exhibit and has seen many advances over the years. Protection of transplanted islets from the immune system can be accomplished by encapsulation within a hydrogel, the most investigated of which is alginate. In this study, islet encapsulation is combined with 3D extrusion bioprinting, an additive manufacturing method which enables the fabrication of 3D structures with a precise geometry to produce macroporous hydrogel constructs with embedded islets. Using a plottable hydrogel blend consisting of clinically approved ultrapure alginate and methylcellulose (Alg/MC) enables encapsulating pancreatic islets in macroporous 3D hydrogel constructs of defined geometry while retaining their viability, morphology, and functionality. Diffusion of glucose and insulin in the Alg/MC hydrogel is comparable to diffusion in plain alginate; the embedded islets continuously produce insulin and glucagon throughout the observation and still react to glucose stimulation albeit to a lesser degree than control islets.
Support and Interface Effects in Water‐Splitting Electrocatalysts
Authors: Zhang Jian , Zhang Qiuyu , Feng Xinliang 
Published: March 2019

AbstractWater‐splitting electrolyzers that can convert electricity into storable hydrogen are a fascinating and scalable energy conversion technology for the utilization of renewable energies. To speed up the sluggish hydrogen and oxygen evolution reactions (HER and OER), electrocatalysts are essential for reducing their kinetic energy barriers and eventually improving the energy conversion efficiency. As efficient strategies for modulating the binding ability of water‐splitting intermediates on electrocatalyst surface, the support effect and interface effect are drawing growing attention. Herein, some of the recent research progress on the support and interface effects in HER, OER, and overall water‐splitting electrocatalysts is highlighted. Specifically, the correlation between the electronic interaction of the constituent components and the electrocatalytic water‐splitting performance of electrocatalysts is profoundly discussed, with the aim of advancing the development of highly efficient water‐splitting electrocatalysts, which may eventually replace the noble‐metal‐based electrocatalysts and bring the practically widespread utilization of water‐splitting electrolyzers into a reality.
Micron‐Scale Patterning of High Quantum Yield Quantum Dot LEDs
Authors: Azzellino Giovanni , Freyria Francesca S. , Nasilowski Michel , Bawendi Moungi G. , Bulović Vladimir 
Published: March 2019

AbstractMicron‐scale resolution patterning of colloidal quantum dots (QDs) is demonstrated by adopting inkjet printing as a technique that is solvent and room temperature compatible, maintains optical and electronic properties of printed QD films, and results in minimal materials waste during the deposition process. With a combination of solvent engineering and substrate patterning single prints of PbS–CdS core–shell QDs (with peak photoluminescence emission at λ = 1270 nm wavelength) are deployed to form QD films of nanoscale‐thickness, with regular micron‐scale patterns. Inkjet printing of infrared QD films is chosen as a case study for manufacture of QD‐light emitting diodes (QD‐LEDs), and demonstrates devices with a record peak external quantum efficiency in excess of 2% that is finally comparable with state‐of‐the‐art spin‐coated prototypes.
Dynamic Metasurfaces Using Phase‐Change Chalcogenides
Authors: Ding Fei , Yang Yuanqing , Bozhevolnyi Sergey I. 
Published: March 2019

AbstractMetasurfaces have attracted increasing attention and provide promising solutions for cost‐effective and highly efficient optics due to their unprecedented capabilities in light manipulation. In recent years, phase‐change materials (PCMs), especially phase‐change chalcogenides, are integrated into metasurfaces to explore innovative configurations exhibiting remarkable tunability and reconfigurability due to the dramatic optical contrasts available in PCMs along with their high chemical and long‐term stability and high switching speeds. In this review, the current achievements and ongoing developments in dynamic metasurfaces based on phase‐change chalcogenides, an emerging field in nanophotonics and optoelectronics, are outlined. Starting with the basic material properties of phase‐change chalcogenides, the structural transformations and dielectric functions of two main chalcogenides are described. This is followed by an overview of the main progress in typical dynamic metasurfaces based on phase‐change chalcogenides enabling global and local amplitude/phase modulation. The review ends with a short conclusion and outlook on possible future developments.
Biomimetic Superstructures Assembled from Au Nanostars and Nanospheres for Efficient Solar Evaporation
Authors: Song Guofen , Yuan Yang , Liu Jie , Liu Qinglei , Zhang Wang , Fang Jing , Gu Jiajun , Ma Dongling , Zhang Di 
Published: March 2019

AbstractThe control of the shapes and assembling structures of plasmonic nanoparticles is vital for the optical properties and photothermal conversion performance. Here, gold nanospheres and nanostars are assembled into ridges/disordered nanohole arrays architecture in nanoparticle colloids using light‐trapping Papilio Paris forewings (OPPs) as templates. In solar steam generation, water evaporation efficiency reaches 83.3% for nanostar assemblies (NSAs) and 68.6% for nanosphere assemblies (NSPAs) under 1‐sun (1 kW m−2) irradiation. Both the biomimetic superstructures exhibit significant enhancement of near‐infrared light absorption compared to OPPs, and NSAs show higher absorption than NSPAs in the range of 200–2500 nm. Finite element method simulations reveal such broadband absorption is ascribed to the hybridization of localized surface plasmon modes of continuous‐assembled Au nanoparticles in the biomimetic structures as well as the wing photonic structures with light‐transferring ridges with an inverted V shape and light‐trapping disordered nanohole arrays. It is revealed that optical properties of superstructures can be tuned not only by controlling their 3D structures but also by changing the shape of nanosized building blocks. It is hoped that this work will provide inspirations for the design and assembly of nanophotonic structures and devices for solar energy conversion.