bluuebunny/crossref_metadata_2025 huggingface dataset:
East Greenland ice core dust record reveals timing of Greenland ice sheet advance and retreat
Authors: Simonsen Marius Folden , Baccolo Giovanni , Blunier Thomas , Borunda Alejandra , Delmonte Barbara , Frei Robert , Goldstein Steven , Grinsted Aslak , Kjær Helle Astrid , Sowers Todd , Svensson Anders , Vinther Bo , Vladimirova Diana , Winckler Gisela , Winstrup Mai , Vallelonga Paul
Published: October 2019

Accurate estimates of the past extent of the Greenland ice sheet provide critical constraints for ice sheet models used to determine Greenland’s response to climate forcing and contribution to global sea level. Here we use a continuous ice core dust record from the Renland ice cap on the east coast of Greenland to constrain the timing of changes to the ice sheet margin and relative sea level over the last glacial cycle. During the Holocene and the previous interglacial period (Eemian) the dust record was dominated by coarse particles consistent with rock samples from central East Greenland. From the coarse particle concentration record we infer the East Greenland ice sheet margin advanced from 113.4 ± 0.4 to 111.0 ± 0.4 ka BP during the glacial onset and retreated from 12.1 ± 0.1 to 9.0 ± 0.1 ka BP during the last deglaciation. These findings constrain the possible response of the Greenland ice sheet to climate forcings.
Epigenetic patterns associated with an ascidian invasion: a comparison of closely related clades in their native and introduced ranges
Authors: Hawes Nicola A. , Amadoru Achira , Tremblay Louis A. , Pochon Xavier , Dunphy Brendon , Fidler Andrew E. , Smith Kirsty F.
Published: October 2019

Environmentally induced epigenetic modifications have been proposed as one mechanism underlying rapid adaptive evolution of invasive species.Didemnum vexillumis an invasive colonial ascidian that has established in many coastal waters worldwide. Phylogenetic analyses have revealed thatD.vexillumpopulations consist of two distinct clades; clade B appears to be restricted to the native range (Japan), whereas clade A is found in many regions throughout the world, including New Zealand. The spread ofD.vexillumclade A suggests that it might be intrinsically more invasive than clade B, despite low levels of genetic diversity compared to populations from the native region. This study investigated whetherD.vexillumclade A exhibits epigenetic signatures (specifically differences in DNA methylation) associated with invasiveness. Global DNA methylation patterns were significantly different between introduced clade A colonies, and both clades A and B in the native range. Introduced colonies also showed a significant reduction in DNA methylation levels, which could be a mechanism for increasing phenotypic plasticity. High levels of DNA methylation diversity were maintained in the introduced population, despite reduced levels of genetic diversity, which may allow invasive populations to respond quickly to changes in new environments. Epigenetic changes induced during the invasion process could provide a means for rapid adaptation despite low levels of genetic variation in introduced populations.
Centrosomal and ciliary targeting of CCDC66 requires cooperative action of centriolar satellites, microtubules and molecular motors
Authors: Conkar Deniz , Bayraktar Halil , Firat-Karalar Elif Nur
Published: October 2019

Mammalian centrosomes and cilia play key roles in many cellular processes and their deregulation is linked to cancer and ciliopathies. Spatiotemporal regulation of their biogenesis and function in response to physiological stimuli requires timely protein targeting. This can occur by different pathways, including microtubule-dependent active transport and via centriolar satellites, which are key regulators of cilia assembly and signaling. How satellites mediate their functions and their relationship with other targeting pathways is currently unclear. To address this, we studied retinal degeneration gene product CCDC66, which localizes to centrosomes, cilia, satellites and microtubules and functions in ciliogenesis. FRAP experiments showed that its centrosomal pool was dynamic and the ciliary pool associated with the ciliary axoneme and was stable. Centrosomal CCDC66 abundance and dynamics required microtubule-dependent active transport and tethering, and was inhibited by sequestration at satellites. Systematic quantitation of satellite dynamics identified only a small fraction to display microtubule-based bimodal motility, consistent with trafficking function. Majority displayed diffusive motility with unimodal persistence, supporting sequestration function. Together, our findings reveal new mechanisms of communication between membrane-less compartments.
Novel Unexpected Reconstructions of (100) and (111) Surfaces of NaCl: Theoretical Prediction
Authors: Kvashnin Alexander G. , Kvashnin Dmitry G. , Oganov Artem R.
Published: October 2019

We have predicted stable reconstructions of the (100) and (111) surfaces of NaCl using the global optimization algorithm USPEX. Several new reconstructions, together with the previously reported ones, are found. For the cleaved bare (100) surface, pure Na and pure Cl are the only stable surface phases. Our study of the (111) surface shows that a newly predicted Na3Cl-(1 × 1) reconstruction is thermodynamically stable in a wide range of chlorine chemical potentials. It has a sawtooth-like profile where each facet reproduces the (100) surface of rock-salt NaCl, hinting on the preferred growth of the (100) surface. We used Bader charge analysis to explain the preferable formation of this sawtooth-like Na3Cl-(1 × 1) reconstruction of the (111) surface of NaCl. We find that at a very high chemical potential of Na, the polar (and normally absent) (111) surface becomes part of the equilibrium crystal morphology. At both very high and very low chemical potentials of Cl, we predict a large decrease of surface energy and fracture toughness (the Rehbinder effect).
Type I toxin-dependent generation of superoxide affects the persister life cycle of Escherichia coli
Authors: Edelmann Daniel , Berghoff Bork A.
Published: October 2019

Induction of growth stasis by bacterial toxins from chromosomal toxin-antitoxin systems is suspected to favor formation of multidrug-tolerant cells, named persisters. Recurrent infections are often attributed to resuscitation and regrowth of persisters upon termination of antibiotic therapy. Several lines of evidence point to oxidative stress as a crucial factor during the persister life cycle. Here, we demonstrate that the membrane-depolarizing type I toxins TisB, DinQ, and HokB have the potential to provoke reactive oxygen species formation in Escherichia coli. More detailed work with TisB revealed that mainly superoxide is formed, leading to activation of the SoxRS regulon. Deletion of the genes encoding the cytoplasmic superoxide dismutases SodA and SodB caused both a decline in TisB-dependent persisters and a delay in persister recovery upon termination of antibiotic treatment. We hypothesize that expression of depolarizing toxins during the persister formation process inflicts an oxidative challenge. The ability to counteract oxidative stress might determine whether cells will survive and how much time they need to recover from dormancy.
Sexual dichromatism and color diversity in the spiny lava lizard Tropidurus spinulosus using lizard visual modelling
Authors: Rossi N. , Benitez-Vieyra S. , Cocucci A. , Chiaraviglio M. , Cardozo G.
Published: October 2019

Colors are important vehicles for social signals in many taxa. In Squamata, previous studies have linked color characteristics and chromatic diversity to sexual selection and, particularly, species showing male-biased body size dimorphism also showed male-biased dichromatism and color diversity. Sexual dichromatism may occur in body regions used for conspecific communication and it may be expressed at wavelengths, such as ultraviolet, easily perceivable by conspecifics. We tested this prediction in a social lizard model,Tropidurus spinulosus, using spectrophotometry and visual modelling which enable colors to be interpreted as the individuals of the same taxon see them. Our results indicate that sexual dichromatism occurs in the ventral regions and the flanks, which are the body regions involved in sexual displays. Males show greater color diversity, having larger color volumes and more contrasting colors. These findings reinforce the idea that sexual selection towards males is coupled with the evolution of male-biased, diverse, coloration which could act as a signal in social reproductive contexts.
Optical properties of folic acid in phosphate buffer solutions: the influence of pH and UV irradiation on the UV-VIS absorption spectra and photoluminescence
Authors: Baibarac Mihaela , Smaranda Ion , Nila Andreea , Serbschi Constantin
Published: October 2019

Using UV-VIS absorption spectroscopy, photoluminescence (PL) and photoluminescence excitation (PLE), the photodegradation reactions of folic acid (FA) in phosphate buffer (PB) solutions were studied. Regardless of the PB solution’s pH, the UV-VIS spectra showed a gradual decrease in absorbance at 284 nm simultaneous with an increase in the absorbance of another band in the spectral range of 320–380 nm, which was downshifted under UV irradiation. The relative intensity of the FA PL band, situated in the spectral range 375–600 nm, was dependent on the pH of the PB solution. The FA PL intensity increased as increasing UV irradiation time up to 281 min. in PB solutions with pH values of 6.4 and 5.4. Under an emission wavelength of 500 nm, the position of the FA PLE spectrum changed as the PB solution pH varied from 7 to 5.4 and the irradiation time increased to 317 min. These changes were correlated with the formation of two photodegradation products, namely, pterine-6-carboxylic acid and p-amino-benzoyl-L-glutamic acid. According to UV-VIS spectroscopy and PL and PLE studies, the presence of various excipients in commercial pharmaceutical tablets does not affect the photodegradation of FA in PB solutions. Using IR spectroscopy, new evidences for the formation of the two photodegradation products of FA in PB solutions are shown.
High-resolution Imaging of the Human Cochlea through the Round Window by means of Optical Coherence Tomography
Authors: Starovoyt Anastasiya , Putzeys Tristan , Wouters Jan , Verhaert Nicolas
Published: October 2019

The human cochlea is deeply embedded in the temporal bone and surrounded by a thick otic capsule, rendering its internal structure inaccessible for direct visualization. Clinical imaging techniques fall short of their resolution for imaging of the intracochlear structures with sufficient detail. As a result, there is a lack of knowledge concerning best practice for intracochlear therapy placement, such as cochlear implantation. In the past decades, optical coherence tomography (OCT) has proven valuable for non-invasive, high-resolution, cross-sectional imaging of tissue microstructure in various fields of medicine, including ophthalmology, cardiology and dermatology. There is an upcoming interest for OCT imaging of the cochlea, which so far was mostly carried out in small animals. In this temporal bone study, we focused on high-resolution imaging of the human cochlea. The cochlea was approached through mastoidectomy and posterior tympanotomy, both standard surgical procedures. A commercially available spectral-domain OCT imaging system was used to obtain high-resolution images of the cochlear hook region through the intact round window membrane in four cadaveric human temporal bones. We discuss the qualitative and quantitative characteristics of intracochlear structures on OCT images and their importance for cochlear implant surgery.
An intramolecular charge transfer and excited state intramolecular proton transfer based fluorescent probe for highly selective detection and imaging of formaldehyde in living cells
Authors: Chen Wen , Yang Mei , Luo Na , Wang Fenglin , Yu Ru-Qin , Jiang Jian-Hui
Published: October 2019

An intramolecular charge transfer and excited state intramolecular proton transfer based fluorescent probe was developed for highly selective detection of FA.
Quantification of total lipids based on the characteristic absorption of tetra-β-(2-octanyloxy)-substituted nickel phthalocyanine
Authors: Li Ping , Cong Fangdi , Zhang Shulin , Zhou Wenli , Zhu Hualing , Xu Yanling , Yu Jinze
Published: October 2019

Molecular mechanism for the quantification of the total lipid content based on ONPc chromophores.
Photoregulation between small DNAs and reversible photochromic molecules
Authors: Wu Zhongtao , Zhang Lei
Published: October 2019

Photochromic molecules can regulate the behaviors of DNA under light irradiation, while DNA also exerts an influence over the photochromic molecules.
Palladium-induced transformation of nematic liquid crystals to robust metallogel comprising self-assembled nanowires
Authors: Maiti Bappa , Bhattacharjee Subham , Bhattacharya Santanu
Published: October 2019

Transformation of nematic liquid crystals to metallogels.
A novel distyryl boron dipyrromethene with two functional tags for site-specific bioorthogonal photosensitisation towards targeted photodynamic therapy
Authors: Guo Xuejiao , Wong Roy C. H. , Zhou Yimin , Ng Dennis K. P. , Lo Pui-Chi
Published: October 2019

A sequential “tag-and-click” process for targeted delivery of photosensitisers for photodynamic therapy.
Electronic structure of mono(Lewis base)-stabilized borylenes
Authors: Lu Dongmei , He Yijin , Wu Chao
Published: October 2019

Mono(Lewis base)-stabilized 3c-6e borylenes are found to have multiple ground state electronic structures.
Correction: Toxicity of nanoencapsulated bifenthrin to rainbow trout (Oncorhynchus mykiss)
Authors: Blewett Tamzin A. , Qi Arthur A. , Zhang Yueyang , Weinrauch Alyssa M. , Blair Salvatore D. , Folkerts Erik J. , Sheedy Claudia , Nilsson Denise , Goss Greg G.
Published: October 2019

Correction for ‘Toxicity of nanoencapsulated bifenthrin to rainbow trout (Oncorhynchus mykiss)’ by Tamzin A. Blewett et al., Environ. Sci.: Nano, 2019, 6, 2777–2785, DOI: 10.1039/C9EN00598F.
The effect of crocetin supplementation on markers of atherogenic risk in patients with coronary artery disease: a pilot, randomized, double-blind, placebo-controlled clinical trial
Authors: Abedimanesh Saeed , Bathaie S. Zahra , Ostadrahimi Alireza , Asghari Jafarabadi Mohammad , Taban Sadeghi Mohammadreza
Published: October 2019

Two-month crocetin supplementation (10 mg day−1) in patients with Coronary Artery Disease (CAD) has positive effects on some atherogenesis-related gene expression, endothelial cell adhesion molecules, HDL, h-FABP, and homocysteine.
Regioselective synthesis, isomerisation, in vitro oestrogenic activity, and copolymerisation of bisguaiacol F (BGF) isomers
Authors: Koelewijn Steven-Friso , Ruijten Dieter , Trullemans Laura , Renders Tom , Van Puyvelde Peter , Witters Hilda , Sels Bert F.
Published: October 2019

Biobased ortho-methoxy groups ameliorate classic bisphenol chemistry in terms of synthesis, safety and processing; bisguaiacol F is used as a test case.
The fabrication and molecular alignment of poly(ethylene oxide) grating film based on hot embossing technology
Authors: Song Zhanhua , Qian Menxiang , Zhang Hangyu , Wang Tao , Ding Guangzhu , Liu Jieping
Published: October 2019

The fabrication and alignment transition of poly(ethylene oxide) grating film via hot embossing technology are demonstrated.
Antibacterial and aqueous dual-responsive sensing activities of monomeric complexes with uncoordinated imidazole sites
Authors: Liang Lili , Miao Maomao , Liu Congsen , Zong Zhihui , Zhang Jun , Fang Qiang
Published: October 2019

The butterfly-shaped monomeric complex is stable and slight soluble in water, which shows antibacterial and aqueous dual-responsive sensing activities.
Synthesis and structure–property correlation of blue fluorescence isomer emitters based on rigid pyrazine-bridged carbazole frameworks
Authors: Wei Lingjuan , Li Jie , Xue Kai , Ye Shanghui , Jiang Hongji
Published: October 2019

The unsymmetrical linking model ofTCz-3,9PA-TCzbased on pyrazine and carbazole moieties is feasible to produce efficient and stable blue-light emitters.
The magnetic graphene oxide/NHC catalyzed aerobic direct amidation and cross-dehydrogenative coupling of aldehydes
Authors: Sepahvand Heshmatollah , Ghasemi Elnaz , Sharbati Mohammad , Mohammadi Melika Sadat , Arshadi Pirlar Maghsoud , Shahverdizadeh Gholam Hossein
Published: October 2019

The synthesis of a novel recoverable catalyst based on graphene and NHC for the cross dehydrogenative coupling of aldehydes is described, as well as the synthesis of amides and the construction of the C–C bonds.
Enhancement and anticipation of the Ioffe–Regel crossover in amorphous/nanocrystalline composites
Authors: Tlili A. , Giordano V. M. , Beltukov Y. M. , Desmarchelier P. , Merabia S. , Tanguy A.
Published: October 2019

Dramatic Ioffe–Regel anticipation for wavepackets propagating in a nanocomposite with strong elastic contrast (right) with respect to amorphous (left).
Evolution of intrinsic vacancies and prolonged lifetimes of vacancy clusters in black phosphorene
Authors: Cai Yongqing , Chen Shuai , Gao Junfeng , Zhang Gang , Zhang Yong-Wei
Published: October 2019

An atomic-scale kinetic process and evolution of vacancies in black phosphorene with the formation of vacancy pairs and clusters.
The synergistic effect of Au-COF nanosheets and artificial peroxidase Au@ZIF-8(NiPd) rhombic dodecahedra for signal amplification for biomarker detection
Authors: Zhang Tingting , Song Yu , Xing Yue , Gu Yue , Yan Xiaoyi , Liu He , Lu Nannan , Xu Haixin , Xu Zhiqian , Zhang Zhiquan , Yang Ming
Published: October 2019

Nanozyme-assisted amplification strategies for sandwich-type electrochemical sensor construction.
Engineering ultrasmall metal nanoclusters for photocatalytic and electrocatalytic applications
Authors: Chai Osburg Jin Huang , Liu Zhihe , Chen Tiankai , Xie Jianping
Published: October 2019

The many fundamental properties of ultrasmall noble metal nanoclusters have made it increasingly clear that they possess enormous potential for photo- and electro-catalytic applications due to their unique electronic and optical properties.
Electronic structure and transport properties of 2D RhTeCl: a NEGF-DFT study
Authors: Qu Hengze , Guo Shiying , Zhou Wenhan , Cai Bo , Zhang Shengli , Huang Yaxin , Li Zhi , Chen Xianping , Zeng Haibo
Published: October 2019

Predicted through the density functional theory coupled with non-equilibrium Green's function method, 2D RhTeCl with promising electronic properties and device performances has the scope of becoming a potential candidate for the future low power devices.
Expression of concern: Controllable 2H-to-1T′ phase transition in few-layer MoTe2
Authors: Mühlberg Michaela
Published: October 2019

Expression of concern for ‘Controllable 2H-to-1T′ phase transition in few-layer MoTe2’ by Yuan Tan et al., Nanoscale, 2018, 10, 19964–19971.
Near-infrared light induced cationic polymerization based on upconversion and ferrocenium photochemistry
Authors: Meng Xiaoyan , Lu Huaqiao , Li Zhiquan , Wang Chen , Liu Ren , Guan Xin , Yagci Yusuf
Published: October 2019

Ferrocenium salts as unimolecular photoinitiators can efficiently initiate upconversion nanoparticle-assisted cationic photopolymerization under near-infrared light excitation.
A pillar[5]arene-based hydrogel adsorbent in aqueous environments for organic micropollutants
Authors: Ju Huaqiang , Zhou Xiaoqi , Shi Bingbing , Kong Xueqian , Xing Hao , Huang Feihe
Published: October 2019

A pillar[5]arene-based hydrogel adsorbent was prepared for the removal of multiple types of organic micropollutants based on host–guest interactions.
Metallic 1T-VS2 nanosheets featuring V2+ self-doping and mesopores towards an efficient hydrogen evolution reaction
Authors: Xu Jun , Zhu Yuan , Yu Bansui , Fang Changji , Zhang Junjun
Published: October 2019

Metallic 1T-VS2 nanosheets featuring V2+-doping and plenty of mesopores have abundant defects and high conductivity and exhibit superior catalytic activity for electrochemical water splitting.
Durable, acid-resistant copolymers from industrial by-product sulfur and microbially-produced tyrosine
Authors: Thiounn Timmy , Tennyson Andrew G. , Smith Rhett C.
Published: October 2019

Copolymers of waste sulfur and bacterially-produced tyrosine are reported.
An ultrasound-assisted approach to bio-derived nanoporous carbons: disclosing a linear relationship between effective micropores and capacitance
Authors: Bai Peiyao , Wei Shilin , Lou Xiaoxian , Xu Lang
Published: October 2019

There is a linear relationship between the effective micropore volume (surface area) and the specific capacitance of bio-derived nanoporous carbons, regardless of biomass type and activation temperature employed.
Development of an intramolecular charge transfer-type colorimetric and fluorescence sensor for water by fusion with a juloidine structure and complexation with boron trifluoride
Authors: Imato Keiichi , Enoki Toshiaki , Ooyama Yousuke
Published: October 2019

An intramolecular charge transfer-type optical sensor fused with a juloidine structure and complexed with boron trifluoride can detect and determine water over a wide concentration range.
Electrochemically switchable rotaxanes: recent strides in new directions
Authors: Schröder Hendrik V. , Schalley Christoph A.
Published: October 2019

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.
Twists or turns: stabilising alpha vs. beta turns in tetrapeptides
Authors: Hoang Huy N. , Hill Timothy A. , Ruiz-Gómez Gloria , Diness Frederik , Mason Jody M. , Wu Chongyang , Abbenante Giovanni , Shepherd Nicholas E. , Fairlie David P.
Published: October 2019

Twisting or turning peptides: ring size and chi angle in side chain cross-linked tetrapeptides together control α- or β-turn structures, which mimic irregular secondary structures in proteins.
CsPbBr3 nanocrystal inks for printable light harvesting devices
Authors: Sorrentino Roberto , Gandini Marina , Figueroa Tapia Jetsabel M. , Petrozza Annamaria
Published: October 2019

NC inks optimization for thin film solar cells printing.
Coupled nanocomposite Co5.47N–Co3Fe7 inlaid in a tremella-like carbon framework as a highly efficient multifunctional electrocatalyst for oxygen transformation and overall water splitting
Authors: Kong Fantao , Zhang Chaoqi , Qiao Yu , Li Ruijing , Kong Aiguo , Shan Yongkui
Published: October 2019

A facile hydrothermal-pyrolysis strategy is proposed to prepare the coupled Co5.47N–Co3Fe7/N-Cs nanocomposite as highly efficient multifunctional electrocatalyst.
Novel nanoparticles of cerium-doped zeolitic imidazolate frameworks with dual benefits of antibacterial and anti-inflammatory functions against periodontitis
Authors: Li Xue , Qi Manlin , Li Chunyan , Dong Biao , Wang Jia , Weir Michael D. , Imazato Satoshi , Du Liuyi , Lynch Christopher D. , Xu Lin , Zhou Yanmin , Wang Lin , Xu Hockin H. K.
Published: October 2019

Novel ZIF-8:Ce nanoparticles provide a unique insight into effective anti-inflammatory and antibacterial platforms for periodontitis treatment.
Single-component solid state white-light emission and photoluminescence color tuning of a Cd(ii) complex and its application as a luminescence thermometer
Authors: Miao Jinling , Nie Yong , Li Yexin , Qin Chengyuan , Ren Yifan , Xu Chunyue , Yan Meijing , Liu Kexin , Liu Guangning
Published: October 2019

A single-component white-light emitting Cd(ii) complex exhibits tunable photoluminescence and acts as a novel luminescence thermometer based on the correlation between temperature and color temperature.
An Interdisciplinary Capstone Design Experience on Critical Embedded Systems using Agile Methods
Authors: Acco P. , Auriol G. , Chanthery E. , Détourbe M.-A. , Hladik P.-E. , Le Botlan D. , Noullet N. , Subias A.
Published: October 2019

This paper relates a capstone design project conceived through an engineering problem-based learning approach. The project is applied to critical embedded systems and the Scrum Agile method is used. The focus of the paper is on the pedagogical experience, so the Intended Learning Outcomes and pedagogical sequence over one semester are presented. Two platforms (the Parrot AR.Drone 2 and a toy car) were used for the project. Pros and cons of such platforms are debated. Tools like Git for the version control and iceScrum for the Agile management are presented. The different roles of teachers as clients, counselors, and evaluators are detailed. This paper shows that an interdisciplinary teaching team is very important in this kind of project, so is the teachers’ engagement in the Agile philosophy. Feedback, analyses and some suggested improvements are given, based on our 5 years’ experience in such projects and surveys.
Microsurgical Resection of Multiple Giant Glomus Tumors
Authors: Ceccato Guilherme H. W. , Rassi Marcio S. , Borba Luis A. B.
Published: October 2019

Glomus tumors, also called paragangliomas, are challenging lesions, demanding accurate knowledge of complex anatomy and pertinent approaches. We present the case of a 39-year-old male presenting with headache, vertigo, tinnitus, hearing loss, and hoarseness. Neurological assessment showed facial paralysis House–Brackmann IV and lower cranial nerves deficits. Preoperative magnetic resonance imaging (MRI) demonstrated two large lesions, suggestive of a glomus jugulare, and carotid body paragangliomas. Considering worsening of the symptoms and the important mass effect of both lesions over the neurovascular structures, microsurgical excision was offered, after preoperative tumor embolization. We preferred to approach both lesions in the same operation, starting by the cervical tumor. Initially there was not an easily identifiable dissection plane between the tumor and the carotid artery, but it was achieved after performing a subadventitial dissection, being possible to resect the entire lesion. The jugular foramen lesion was approached through a postauricular transtemporal approach, skeletonizing the sigmoid sinus, jugular bulb, and facial nerve, following a complete mastoidectomy. The tumor, extending to the intradural compartment, middle ear, internal auditory canal, petrous internal carotid artery, and internal jugular vein was completely removed. Postoperative MRI demonstrated complete resection of both lesions, and pathology confirmed to be paragangliomas. In the immediate postoperative period, the facial paralysis evolved to House–Brackmann grade VI, improving to grade III during follow-up. The patient underwent a vocal cord medialization in order to improve voice quality and swallowing. These are challenging lesions and extensive laboratory training is mandatory to be familiarized with the regional anatomy and its various surgical approaches.

The link to the video can be found at: https://youtu.be/gA_ckwFq_9c.
Minimizing lattice structures for Morse potential energy in two and three dimensions
Authors: Bétermin Laurent
Published: October 2019

We investigate the local and global optimality of the triangular, square, simple cubic, face-centered-cubic (fcc) and body-centered-cubic (bcc) lattices and the hexagonal-close-packing (hcp) structure for a potential energy per point generated by a Morse potential with parameters (α, r0). In dimension 2 and for α large enough, the optimality of the triangular lattice is shown at fixed densities belonging to an explicit interval, using a method based on lattice theta function properties. Furthermore, this energy per point is numerically studied among all two-dimensional Bravais lattices with respect to their density. The behavior of the minimizer, when the density varies, matches with the one that has been already observed for the Lennard-Jones potential, confirming a conjecture we have previously stated for differences of completely monotone functions. Furthermore, in dimension 3, the local minimality of the cubic, fcc, and bcc lattices is checked, showing several interesting similarities with the Lennard-Jones potential case. We also show that the square, triangular, cubic, fcc, and bcc lattices are the only Bravais lattices in dimensions 2 and 3 being critical points of a large class of lattice energies (including the one studied in this paper) in some open intervals of densities as we observe for the Lennard-Jones and the Morse potential lattice energies. More surprisingly, in the Morse potential case, we numerically found a transition of the global minimizer from bcc, fcc to hcp, as α increases, that we partially and heuristically explain from the lattice theta function properties. Thus, it allows us to state a conjecture about the global minimizer of the Morse lattice energy with respect to the value of α. Finally, we compare the values of α found experimentally for metals and rare-gas crystals with the expected lattice ground-state structure given by our numerical investigation/conjecture. Only in a few cases does the known ground-state crystal structure match the minimizer we find for the expected value of α. Our conclusion is that the pairwise interaction model with Morse potential and fixed α is not adapted to describe metals and rare-gas crystals if we want to take into consideration that the lattice structure we find in nature is the ground-state of the associated potential energy.
Structure, electrical and magnetic properties of Co0.8Zn0.2Fe2O4/(K0.47Na0.47Li0.6) NbO3 bilayered thin films grown by pulsed laser deposition
Authors: Shamim Md Kashif , Sharma Seema , Choudhary R. J.
Published: October 2019

Structural, ferroelectric, and magnetic properties of lead-free bilayer composite films with composition (K, Na, Li) NbO3-CoZnFe2O4 (P-S) and CoZnFe2O4-(K, Na, Li) NbO3 (S-P) layers deposited on Pt/Si substrates by a pulsed laser deposition technique have been studied. Structural analysis carried out by X-ray diffraction and Raman scattering confirmed the formation of individual phases of perovskite and spinel without any intermediate/secondary phase. To probe the stoichiometric elemental composition and cationic distribution at the interstitial sites, X-ray photoelectron spectroscopy measurement was carried out, which confirmed the mixed state of Fe-ions valence, while the Zn2+ state was retained. Ferroelectric and ferromagnetic behavior of the bilayered films was observed concurrently depending upon the growth sequence adopted. Magnetic properties of the film with spinel on the top layer exhibited higher saturation magnetization. Dielectric permittivity follows the Maxwell–Wagner polarization caused by thermally agitated carriers. Appreciable ferroelectric properties were achieved in S-P films while the P-S film exhibited a lossy ferroelectric hysteresis loop, which is attributed to a high leakage current value.
Influence of chemical solution growth and vacuum annealing on the properties of (100) pseudocubic oriented BiFeO3 thin films
Authors: Nandy Subhajit , Sudakar C.
Published: October 2019

BiFeO3 (BFO), a Pb-free perovskite oxide, is being explored for its potential use in a multitude of applications. We report on the oriented growth of BFO thin films using a facile metal-organic chemical solution deposition. Unlike the growth characteristics observed in Si/SiO2 and glass/FTO substrates, the solution growth process on sapphire (0001) is found to yield highly oriented thin films along (100)pc planes. Furthermore, annealing in air (BFO-A) and high-vacuum (BFO-V) ambients are done to explore the tunable limits of its physical properties. Temperature-dependent Raman studies highlight the high quality of thin films with sharp changes in Raman modes around transition temperatures. In addition, the films exhibit a hitherto unreported anomalous shift in A1(TO) and E(TO) modes around 450 K. The bandgap of BFO-V (Eg = 2 eV) is lower than that of BFO-A (Eg = 2.12 eV) and exhibits an increased defect photoluminescence emission. The magnetization (M) is twofold higher for BFO-V [M ≈ 42 (67) emu/cm3 at 300 K (5 K)]. In-plane and out-of-plane M vs H plots show larger anisotropy and hard hysteresis for BFO-A compared to BFO-V. Piezoelectric switching with d33 values of 5–10 pm/V is the characteristic of BFO ferroelectric materials. Photoconductivity measurements show a one order increase due to vacuum annealing. Carrier generation and recombination lifetimes are twofold faster in BFO-V as compared to BFO-A thin films. The controllable physical properties of oriented BiFeO3 thin films will be useful in magnetoelectrics and photoferroelectrics applications.
Optimized hybrid functionals for defect calculations in semiconductors
Authors: Deák Peter , Lorke Michael , Aradi Bálint , Frauenheim Thomas
Published: October 2019

Defects influence the electronic and optical properties of crystals, so their identification is crucial to develop device technology for materials of micro-/optoelectronics and photovoltaics. The identification requires the accurate calculation of the electronic transitions and the paramagnetic properties of defects. The achievable accuracy is strongly limited in the case of the (semi)local approximations to density functional theory, because of the underestimation of the gap and of the degree of localization. In the past two decades, hybrid functionals, mixing semilocal and nonlocal exchange semiempirically, have emerged as an alternative. Very often, however, the parameters of such hybrids have to be tuned from material to material. In this paper, we describe the theoretical foundations for the proper tuning and show that if the relative positions of the band edge states are well reproduced, and the generalized Koopmans's theorem is fulfilled by the given parameterization, the calculated defect levels and localizations can be very accurate. As demonstrated here, this can be achieved with the two-parameter Heydt-Scuseria-Ernzerhof hybrid, HSE(α,μ) for diamond, Si, Ge, TiO2, GaAs, CuGaS(Se)2, GaSe, GaN, and Ga2O3. The paper describes details of the parameterization process and discusses the limitations of optimizing HSE functionals. Based on the gained experience, future directions for improving exchange functionals are also provided.
Measurement of the third order nonlinear susceptibility of paratellurite single crystal using multiplex CARS
Authors: Rajaofara Zakaniaina , Leproux Philippe , Capitaine Erwan , Kano Hideaki , Hayakawa Tomokatsu , Thomas Philippe , Duclère Jean-René , Couderc Vincent
Published: October 2019

We report the extraction of the real part of the third order nonlinear susceptibility for a c-cut paratellurite (TeO2 − α) single crystal using the nonresonant contribution of the multiplex coherent anti-Stokes Raman scattering (M-CARS) signal. Using fused silica and SF57 as nonlinear reference materials, we derive the absolute value of the real part of the electronic third order susceptibility and we evidence the in-plane modulation of the nonlinear refractive index. These results are in total agreement with those recently obtained by the z-scan method.
Gaseous “nanoprobes” for detecting gas-trapping environments in macroscopic films of vapor-deposited amorphous ice
Authors: Talewar Sukhpreet K. , Halukeerthi Siriney O. , Riedlaicher Regina , Shephard Jacob J. , Clout Alexander E. , Rosu-Finsen Alexander , Williams Gareth R. , Langhoff Arne , Johannsmann Diethelm , Salzmann Christoph G.
Published: October 2019

Vapor-deposited amorphous ice, traditionally called amorphous solid water (ASW), is one of the most abundant materials in the universe and a prototypical material for studying physical vapor-deposition processes. Its complex nature arises from a strong tendency to form porous structures combined with complicated glass transition, relaxation, and desorption behavior. To gain further insights into the various gas-trapping environments that exist in ASW and hence its morphology, films in the 25–100 μm thickness range were codeposited with small amounts of gaseous “nanoprobes” including argon, methane, helium, and carbon dioxide. Upon heating in the 95–185 K temperature range, three distinct desorption processes are observed which we attribute to the gas desorption out of open cracks above 100 K, from internal voids that collapse due to the glass transition at ∼125 K and finally from fully matrix-isolated gas induced by the irreversible crystallization to stacking disordered ice (ice Isd) at ∼155 K. Nanoscale films of ASW have only displayed the latter desorption process which means that the first two desorption processes arise from the macroscopic dimensions of our ASW films. Baffling the flow of water vapor toward the deposition plate greatly reduces the first desorption feature, and hence the formation of cracks, but it significantly increases the amount of matrix-isolated gas. The complex nature in which ASW can trap gaseous species is thought to be relevant for a range of cosmological processes.
Novel high pressure structures and mechanical properties of rhenium diboride
Authors: Wang Yi X. , Yan Zheng X. , Liu Wei , Zhou Gao L.
Published: October 2019

The pressure-induced phase transition and mechanical properties of rhenium diboride (ReB2) have been investigated by using the particle swarm optimization algorithm in combination with density functional theory calculations. It was found that the P63/mmc structure of ReB2 (hP6-ReB2) is the most stable phase at ambient conditions, and it will transform to P6/mmm structure (hP3-ReB2) at about 300.7 GPa. Phonon dispersion curve calculations suggest that hP6-ReB2 and hP3-ReB2 possess dynamical stabilities in a wide range of 0–400 and 120–400 GPa, respectively. Moreover, the calculated hardness of hP6-ReB2 is 38.1 GPa at ambient conditions, suggesting it is a potential hard material. However, hP3-ReB2 just possesses the hardness value of 18.9 GPa at the pressure of 120 GPa. Finally, by means of the quasiharmonic approximation method, the high-pressure and finite-temperature phase diagram of ReB2 is proposed. It is found that the transition pressure of hP6-ReB2 to hP3-ReB2 decreases with increasing temperatures.
Epitaxial stabilization of single phase κ-(InxGa1−x)2O3 thin films up to x = 0.28 on c-sapphire and κ-Ga2O3(001) templates by tin-assisted VCCS-PLD
Authors: Kneiß M. , Hassa A. , Splith D. , Sturm C. , von Wenckstern H. , Lorenz M. , Grundmann M.
Published: October 2019

High-quality (InxGa1−x)2O3 thin films in the orthorhombic κ-phase were grown by pulsed-laser deposition (PLD) on c-sapphire substrates as well as PLD-grown κ-Ga2O3 thin film templates. We varied the In-content 0 ≤ x ≤ 0.38 of the layers using a single, elliptically segmented, and tin-doped (In0.4Ga0.6)2O3/Ga2O3 target, employing the vertical continuous composition spread (VCCS) PLD-technique. A stoichiometric transfer of In and Ga from the target to the thin films has been confirmed, suggesting that the formation of volatile Ga2O and In2O suboxides is not a limiting factor in the tin-assisted growth mode. For all x, the thin films crystallized predominantly in the κ-modification as demonstrated by XRD 2θ-ω scans. However, for x > 0.28, phase separation of the cubic bixbyite and the κ-phase occurred. The κ-Ga2O3 template increased the crystalline quality of the κ-(InxGa1−x)2O3 thin film layers remarkably. Epitaxial, but relaxed growth with three in-plane rotational domains has been found for all thin films by XRD ϕ-scans or reciprocal space map measurements. Smooth surface morphologies (Rq < 3 nm) for all phase pure thin films were evidenced by atomic force microscopy measurements, making them suitable for multilayer heterostructures. The composition-dependent in- and out-of plane lattice constants follow a linear behavior according to Vegard’s law. A linear relationship can also be confirmed for the optical bandgaps that demonstrate the feasibility of bandgap engineering in the energy range of 4.1–4.9 eV. The results suggest κ-(InxGa1−x)2O3 as a promising material for heterostructure device applications or photodetectors.
Highly luminescent double-heterojunction nanorods
Authors: Drake Gryphon A. , Flanagan Joseph C. , Shim Moonsub
Published: October 2019

Anisotropic shape and band structure engineered into double-heterojunction nanorods (DHNRs) can improve and impart new optical/optoelectronic capabilities in colloidal quantum dot-based devices. However, the photoluminescence quantum yield of DHNRs, which is significantly lower than the near-ideal limit recently achieved in the state-of-the-art core/shell quantum dots, remains as their main limitation. Here, we examine how the photoluminescence of CdS/CdSe/ZnSe DHNRs is affected by (1) the length of the CdS seed nanorods, (2) the rod and tip diameter dependent variations in band offset, and (3) the CdSe-like islands on the sides of DHNRs that can result as a side-product of ZnSe shell growth. By understanding and optimizing these three key parameters, we demonstrate an improvement in the photoluminescence quantum yield up to 93% (up to 62% for excitation above CdS bandgap) while retaining useful shape anisotropy and the band structure design in DHNRs.
A force field of Li+, Na+, K+, Mg2+, Ca2+, Cl−, and SO42− in aqueous solution based on the TIP4P/2005 water model and scaled charges for the ions
Authors: Zeron I. M. , Abascal J. L. F. , Vega C.
Published: October 2019

In this work, a force field for several ions in water is proposed. In particular, we consider the cations Li+, Na+, K+, Mg2+, and Ca2+ and the anions Cl− and SO42−. These ions were selected as they appear in the composition of seawater, and they are also found in biological systems. The force field proposed (denoted as Madrid-2019) is nonpolarizable, and both water molecules and sulfate anions are rigid. For water, we use the TIP4P/2005 model. The main idea behind this work is to further explore the possibility of using scaled charges for describing ionic solutions. Monovalent and divalent ions are modeled using charges of 0.85 and 1.7, respectively (in electron units). The model allows a very accurate description of the densities of the solutions up to high concentrations. It also gives good predictions of viscosities up to 3 m concentrations. Calculated structural properties are also in reasonable agreement with the experiment. We have checked that no crystallization occurred in the simulations at concentrations similar to the solubility limit. A test for ternary mixtures shows that the force field provides excellent performance at an affordable computer cost. In summary, the use of scaled charges, which could be regarded as an effective and simple way of accounting for polarization (at least to a certain extend), improves the overall description of ionic systems in water. However, for purely ionic systems, scaled charges will not adequately describe neither the solid nor the melt.
Integrating physics demonstrations in undergraduate audiology classroom
Authors: Özmen Kübra
Published: October 2019

This paper focuses on the potential benefits of integrating physics demonstrations as a mediator for learning the physics of sound, acoustics and psychoacoustics in an undergraduate audiology classroom. The participants of this study were 54 first-year audiology students enrolled in the Physics of Sound and Acoustics course. According to the results, students’ physics achievement in a paper-pencil test (midterm exam) was found to be a good predictor for the good understanding of psychoacoustics. However, the results of a multiple regression analysis showed that student’s performance in physics demonstrations also mediate the process of learning in this course.
Learning mathematics through mathematical modeling approach using jembatan musi 2 context
Authors: Riyanto Bambang , Zulkardi  , Ilma Indra Putri Ratu , Darmawijoyo
Published: October 2019

Mathematics becomes more meaningful for students with modeling, and students are interested in this approach. The purpose of this study is how is the modeling of high school mathematics using the context of Jembatan Musi 2 taught in high schools?. This study used design research. Based on pilot teaching, learning experiments, and retrospective analysis learning devices and students worksheet are obtained for teachers teaching mathematical modeling, using the context of Jembatan Musi 2.
Students problem-solving abilities using the problem-based learning model with a metacognitive approach
Authors: Panjaitan Simon M , Hutauruk A JB
Published: October 2019

This article is about research on the study of improving students’ problem-solving abilities in the learning process using the Problem Based Learning learning model with the Metacognitive approach. This article also contains a study of the interaction between the learning model and the students’ mathematical prior knowledge towards problem-solving abilities, and the study of student behavior in improving mathematical problem-solving skills. The research uses quantitative research methods with research subjects students in the experimental class and the control class. The research instrument consisted of tests of mathematical problem-solving abilities, observation sheets, and interview guidelines. Research findings include (1) the learning model used does not have a significant difference in mathematical problem-solving skills, both overall and based on prior mathematical knowledge, (2) the learning model used does not have a significant effect on improving mathematical problem-solving abilities, both overall and based on mathematical prior experience, and (3) there is no interaction between learning models and mathematical prior knowledge to improve mathematical problem solving abilities.
Students mathematical literacy abilities in solving PISA type math problem with LRT context
Authors: Hardianti S , Zulkardi Z
Published: October 2019

One of the issues in mathematics education was many math problems requiring reasoning skills were included in the National Examination. This was part of the attempts to gradually adjust Indonesian standards to international standards such as PISA. The purpose of this article was to assess the potential effects of PISA-type math problem on students’ math literacy abilities. The method used in this article was design research type development studies, which consist of 2 stages, preliminary and formative evaluation. The preliminary stage consists of analysis and design. In the formative assessment consists of self-evaluations, expert reviews, one-to-one, small groups, and field tests. The potential effect of the problem was indicated by the results in the field test stage. The mathematical literacy abilities that emerge were communication skills, mathematics, representation, reasoning, and arguments, choosing strategies in solving problems, and the ability to use language, symbolic, formal, and technical operations. Communication skills dominate over other mathematical literacy abilities.
Virtual manipulatives media in mathematical abstraction
Authors: Hakim L L , Alghadari F , Widodo S A
Published: October 2019

By the characteristics of mathematics, which has the object of study is abstract, then the abstraction becomes an important part that can not be separated from mathematics. The development of abstraction theories, either directly or not, will be closely related to the process of learning mathematics in the classroom. Also, the rapid development of virtual manipulatives media in the world of mathematics education can bring a good influence on the learning process that takes place in the classroom. In this regard, this paper aims to examine theories of abstraction in mathematics and its possible implementation in mathematics education which is integrated with virtual manipulatives media to provide a choice to overcome various problems of learning mathematics. In the world of mathematics education, some abstract concepts in mathematics will be more easily learned through empirical abstraction processes such as introducing the concept of positive integers in students. However, when abstract concepts are not allowed to be empirically introduced to the students, the role of virtual manipulatives media can be one of the alternatives to choose from. Also, virtual media manipulatives can be utilized to facilitate the process of reflective abstraction and theoretical abstraction