bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dislocation‐Free and Atomically Flat GaN Hexagonal Microprisms for Device Applications
Authors: Khalilian Maryam , Bi Zhaoxia , Johansson Jonas , Lenrick Filip , Hultin Olof , Colvin Jovana , Timm Rainer , Wallenberg Reine , Ohlsson Jonas , Pistol Mats‐Erik , Gustafsson Anders , Samuelson Lars 
Published: June 2020

AbstractIII‐nitrides are considered the material of choice for light‐emitting diodes (LEDs) and lasers in the visible to ultraviolet spectral range. The development is hampered by lattice and thermal mismatch between the nitride layers and the growth substrate leading to high dislocation densities. In order to overcome the issue, efforts have gone into selected area growth of nanowires (NWs), using their small footprint in the substrate to grow virtually dislocation‐free material. Their geometry is defined by six tall side‐facets and a pointed tip which limits the design of optoelectronic devices. Growth of dislocation‐free and atomically smooth 3D hexagonal GaN micro‐prisms with a flat, micrometer‐sized top‐surface is presented. These self‐forming structures are suitable for optical devices such as low‐loss optical cavities for high‐efficiency LEDs. The structures are made by annealing GaN NWs with a thick radial shell, reforming them into hexagonal flat‐top prisms with six equivalents either m‐ or s‐facets depending on the initial heights of the top pyramid and m‐facets of the NWs. This shape is kinetically controlled and the reformation can be explained with a phenomenological model based on Wulff construction that have been developed. It is expected that the results will inspire further research into micron‐sized III‐nitride‐based devices.
Modular Molecular Self‐Assembly for Diversified Chiroptical Systems
Authors: Wang Zhuoer , Zhang Heng , Hao Aiyou , Zhao Yanli , Xing Pengyao 
Published: June 2020

AbstractBottom‐up multicomponent molecular self‐assembly is an efficient approach to fabricate and manipulate chiral nanostructures and their chiroptical activities such as the Cotton effect and circular polarized luminescence (CPL). However, the integrated coassembly suffers from spontaneous and inherent systematic pathway complexity with low yield and poor fidelity. Consequently, a rational design of chiral self‐assembled systems with more than two components remains a significant challenge. Herein, a modularized, ternary molecular self‐assembly strategy that generates chiroptically active materials at diverse hierarchical levels is reported. N‐terminated aromatic amino acids appended with binding sites for charge transfer and multiple hydrogen bonds undergo the evolution of supramolecular chirality with unique handedness and luminescent color, generating abundant CPL emission with high luminescence dissymmetry factor values in precisely controlled modalities. Ternary coassembly facilitates high‐water‐content hydrogel formation constituted by super‐helical nanostructures, demonstrating a helix to toroid topological transition. This discovery would shed light on developing complicated multicomponent systems in mimicking biological coassembly events.
Bottom‐Up Design of Composite Supraparticles for Powder‐Based Additive Manufacturing
Authors: Canziani Herbert , Chiera Salvatore , Schuffenhauer Thomas , Kopp Sebastian‐Paul , Metzger Florian , Bück Andreas , Schmidt Michael , Vogel Nicolas 
Published: June 2020

AbstractAdditive manufacturing promises high flexibility and customized product design. Powder bed fusion processes use a laser to melt a polymer powder at predefined locations and iterate the scheme to build 3D objects. The design of flowable powders is a critical parameter for a successful fabrication process that currently limits the choice of available materials. Here, a bottom‐up process is introduced to fabricate tailored polymer‐ and composite supraparticles for powder‐based additive manufacturing processes by controlled aggregation of colloidal primary particles. These supraparticles exhibit a near‐spherical shape and tailored composition, morphology, and surface roughness. These parameters can be precisely controlled by the mixing and size ratio of the primary particles. Polystyrene/silica composite particles are chosen as a model system to establish structure–property relations connecting shape, morphology, and surface roughness to the adhesion within the powder, which is accessed by tensile strength measurements. The adhesive properties are then connected to powder flowability and it is shown that the resulting powders allow the formation of dense powder films with uniform coverage. Finally, successful powder bed fusion is demonstrated by producing macroscopic single layer specimens with uniform distribution of nanoscale silica additives.
Nanopore Targeted Sequencing for the Accurate and Comprehensive Detection of SARS‐CoV‐2 and Other Respiratory Viruses
Authors: Wang Ming , Fu Aisi , Hu Ben , Tong Yongqing , Liu Ran , Liu Zhen , Gu Jiashuang , Xiang Bin , Liu Jianghao , Jiang Wen , Shen Gaigai , Zhao Wanxu , Men Dong , Deng Zixin , Yu Lilei , Wei Wu , Li Yan , Liu Tiangang 
Published: June 2020

AbstractThe ongoing global novel coronavirus pneumonia COVID‐19 outbreak has engendered numerous cases of infection and death. COVID‐19 diagnosis relies upon nucleic acid detection; however, currently recommended methods exhibit high false‐negative rates and are unable to identify other respiratory virus infections, thereby resulting in patient misdiagnosis and impeding epidemic containment. Combining the advantages of targeted amplification and long‐read, real‐time nanopore sequencing, herein, nanopore targeted sequencing (NTS) is developed to detect SARS‐CoV‐2 and other respiratory viruses simultaneously within 6–10 h, with a limit of detection of ten standard plasmid copies per reaction. Compared with its specificity for five common respiratory viruses, the specificity of NTS for SARS‐CoV‐2 reaches 100%. Parallel testing with approved real‐time reverse transcription‐polymerase chain reaction kits for SARS‐CoV‐2 and NTS using 61 nucleic acid samples from suspected COVID‐19 cases show that NTS identifies more infected patients (22/61) as positive, while also effectively monitoring for mutated nucleic acid sequences, categorizing types of SARS‐CoV‐2, and detecting other respiratory viruses in the test sample. NTS is thus suitable for COVID‐19 diagnosis; moreover, this platform can be further extended for diagnosing other viruses and pathogens.
The anti‐microbial activities of secosteroids isolated from Physalis angulata
Authors: Cuong Le Canh Viet , Dat Ton That Huu , Nhiem Nguyen Xuan , Cuc Nguyen Thi , Yen Duong Thi Hai , Anh Hoang Le Tuan 
Published: June 2020

AbstractIn this article, four secosteroids, including physalin B (1), physalin D (2), physalin F (3), and physalin G (4) were isolated from the dichloromethane extract of P. angulata growing in Thai Binh, Vietnam by using various chromatographic methods. Their chemical structures were determined by analyses of 1D and 2D‐NMR spectral data as well as comparison with those published in the literature. Anti‐microbial assays showed that compounds 1‐3 exhibited anti‐microbial against a panel of clinically significant microorganisms with MIC values from 32 to 128 μg/mL.
Using oxygen depletion to reduce maize weevils without chemicals in a storage minienvironment
Authors: Van Duong Nguyen , Khanh Le Quoc , Xuan Bui Thanh , Hung Chu Tam , Que Le Xuan 
Published: June 2020

AbstractThe growth of main maize weevils Sitophilus zeamais (Motschulsky) (SzM) was studied in maize storage minienvironments (MEs) with different oxygen concentration (CO2) ranging from 0 %, 5 %, 10 %, 15 % and 21 %. The obtained results showed that at low oxygen concentrations of 15 %, 10 % and 5 %, the total number of weevils presented in the MEs (alive or dead) at moments of tallying weevils, decreased as a function of CO2. In ME at 5 % oxygen, after 80 testing days there were 90 weevils appeared; but in ME at 21 % oxygen there were 576 weevils appeared. In ME at CO2 = 0 % there was no weevils appeared. Consequently there was not found any dead weevil, in terms of pure mathematics as same as at oxygen concentration of 21 %. It was found that, in the test frame at oxygen concentration range of 5‐21 %, the lower the oxygen concentration in the ME, the lower the number of weevils appeared, and the larger the number of death weevils. However the ME with CO2 = 0 %, where was no weevil SzM appeared, was considered as one of the most suitable for the maize grain preservation without using any chemical.
Coordination complexes of slight tetrylene with platinum(II)‐8‐hydroxyquinolines: Structure and bonding analysis
Authors: Loan Huynh Thi Phuong , Van Duc Hoang , Quy Phan Tu , Thuy Bui Thi Phuong , Van Tat Pham , Quang Duong Tuan , Nhung Nguyen Thi Ai 
Published: June 2020

AbstractThe structure and bonding situation in platinum complexes containing slight tetrylene ligands [{PtCl‐C9H6NO}‐NHE] (Pt‐NHE) with E = C, Si, Ge were examined by DFT calculations with the levels are BP86/def2‐SVP and BP86/def2‐TZVPP. The predicted equilibrium structure of the ligands NHE in Pt‐NHE are bonded in distorted end‐on way to PtCl‐8‐hydroxyquinolines fragment with the bending angle, α, exhibits the biggest value in carbenes systems then slightly decrease from Pt‐NHC to Pt‐NHGe. Bond dissociation energies (BDEs), De (kcal.mol‐1), decrease from the carbene complex to the weaker bonded silylene and germylene manners. The BDE when considering dispersion correction at the BP86‐D3(BJ)/def2‐TZVPP level confirms that Pt‐E bond in Pt‐NHE belongs to the effect of the bulky group in slight tetrylene NHE and Pt(II)‐group fragment which makes the intrinsic Pt‐E bond strength decreases from carbene to germylene complexes. The hybridization of atoms E and Pt have large p characters while the hybridization of atom Pt has greater d character which lead to the Pt‐E bond possesses not only NHE→{PtCl‐C9H6NO} strong σ‐donation but also a significant contribution π‐donation NHE→{PtCl‐C9H6NO} and weak π‐backdonation metal‐ligand NHE←{PtCl‐C9H6NO} in complexes Pt‐NHE.
Preliminary assessment of the sediment quality of Bach Dang estuary using Embryo assay of the Pacific oyster, Crassostrea gigas
Authors: Mai Huong , Hue Nguyen Thi , Van Tuan Nguyen , Sinh Le Xuan 
Published: June 2020

AbstractThe Pacific oyster, Crassostrea gigas, was used as a bioindicator organism to investigate the sediment quality of at Dinh Vu port and Dong Bai intertidal in the Bach Dang estuary. The embryos of oyster were exposed to sediment contacts for 24 h to quantify the abnormality percentage of the development of D‐shape oyster larvae. In the sediments collected from April to July 2016, the results showed that the low sediment concentrations (0.5 and 1.0 g.L‐1) had higher development defect for oyster embryos. The development of oyster embryos had no affected because the concentration of ammonium and particulate organic carbon were low in Bach Dang estuary.
Chemical constituents from ethyl acetate extract of the stems of Rourea oligophlebia Merr.
Authors: Thuc Dinh Ngoc , Thuy Vu Thi , Mai Vu Thi Ha , Thanh Le Nguyen , Van Quan Vo 
Published: June 2020

AbstractRourea oligophlebia (Connaraceae) plant has been traditionally used for the treatment of bleeding and bone fractures. Chemical study on the ethyl acetate extract of the stem of Rourea oligophlebia, collected at Ben En National Park, Thanh Hoa province, have led to the isolation of five compounds including friedelin (1), friedelinol (2), coniferyl alcohol (3), 7α‐hydroxyl‐3β‐sistosterol (4) and scopoletin (5). The structures of these compounds have been elucidated by NMR, MS spectroscopic data and comparison with the reported literatures. This is the first report of chemical study on Rourea oligophlebia stems. Compounds 1‐4 were isolated from Rourea genus for the first time.
Rapid classification of rice in Northern Vietnam by using FTIR spectroscopy combined with chemometrics methods
Authors: Giang Le Truong , Thien Tran Lam Thanh , Yen Dao Hai 
Published: June 2020

AbstractFourier‐transform infrared spectroscopy were used to analyze 42 commercial rice samples from 7 different rice varieties available in Vietnamese market. Infrared data were recorded by attenuated total reflection mode (ATR mode). The obtained data from the analysis were collected and statistically proceeded by the virtue of chemometric method including Principal Component Analysis (PCA), Partial Least Squares (PLS) and Orthogonal Partial Least Square‐Discriminant Analysis (OPLS‐DA). The combination of infrared signal data (FTIR fingerprints) and suitable data processing method brought about the ability to distinguish types of rice examined in this study. When PCA and OPLS‐DA techniques are applied, 100 % of rice samples is correctly classified. The results illustrated that the method utilized in this study has been a quick and powerful tool to successfully classify the varieties of rice on the market contributing to rapid detection of mixing and falsifying the rice categories.
Several explosion behaviours of the emulsion explosives sensitized by cenospheres
Authors: Sang Dam Quang , Anh Nguyen Tuan 
Published: June 2020

AbstractThe paper presents the influence of contents and particle sizes of cenospheres (a product extracted from fly ashes of thermal power plants) on the velocity of detonation (VOD) and brisance of emulsion explosives. Experimental results show that cenospheres are hollow balloons with 95 % of the particles in a range of 60‐270 μm, and their main chemical compositions are SiO2 and Al2O3. With cenosphere contents in a range of 10‐15 % over 100 % of the emulsion matrix, the VOD reaches approximately 4000 m/s at 31.38 mm of charge diameter and the brisance is in a range of 14‐16 mm. In addition, explosives, sensitized by cenospheres smaller than 160 μm, have VOD and brisance are better than which using cenospheres greater than 160 μm or unsieved cenospheres. Emulsion explosives sensitized by 10 % of unsieved cenospheres have maximum VOD of 5409 m/s, explosion heat of 999 cal/g, and work capability of 85 % compared to TNT.
Pregnanes from the leaves of Dregea volubilis
Authors: Phuong Phan Tuan , Thuy Nguyen Thi Kim , Van Huan Nguyen , Nhiem Nguyen Xuan , Van Kiem Phan 
Published: June 2020

AbstractOne known pregnane, 17β‐marsdenin (1), and three pregnane glycosides, stavaroside H (2), hoyacarnoside G (3), and dregeoside A11 (4) were isolated from the leaves of Dregea volubilis. Their chemical structures were determined using NMR spectra and comparing with the reported data. This is the first report of compounds 1 and 3 from D. volubilis and of 2 from Dregea genus.
Synthesis of Ag nano/TiO2 by electron beam irradiation for photo‐degradation of rhodamine B compound in water
Authors: Lan Nguyen Thi Kim , Duoc Nguyen Thanh , Duy Nguyen Ngoc , Van Chung Cao , Du Bui Duy , Hien Nguyen Quoc 
Published: June 2020

AbstractStudy on a thorough treatment of organic compounds in the polluted environment is always a prime concern of each country. In this study, silver nano doped on TiO2 (Ag nano/TiO2) samples with different initial Ag concentrations in the range of 0.5‐3 % were synthesized by electron beam irradiation method. The synthesized Ag nano/TiO2 material was characterized by transmission electron microscopy (TEM), X‐ray diffraction (XRD) and Brunauer‐Emmett‐Teller measurement (BET). The size of Ag nanoparticles was in the range of 2 ‐ 30 nm. The photocatalytic activity of Ag nano/TiO2 materials with different initial Ag contents for Rhodamine B (RhB) decomposition was also investigated. The photocatalytic efficiency of RhB degradation by Ag nano/TiO2 material was higher than that of TiO2 about 33% after 2.5 hours under visible light irradiation.
Evaluation on antimicrobial potential of dipterocarpol and dammarenolic acid derivatives from Dipterocarpus alatus
Authors: Smirnova Irina E. , Thao Tran Thi Phuong 
Published: June 2020

AbstractDerivatives of natural dipterocarpol, dammarenolic acid and semisynthetic hollongdione were modified by the Beckman rearrangement 2 type, amination and Willgerodt ‐ Kindler reactions. The structures of new compounds were confirmed by MS, 1H‐NMR and 13C‐NMR spectroscopic analysis. Antibacterial and antifungal activities of the compounds were estimated at the University of Queensland (Australia). The result of the in vitro antimicrobial inhibitory activity revealed N‐methylpiperazinyl amide of dammarenolic acid a new lead compound with significant antifungal activity against Cryptococcus neoformans var. Grubii (MICs ≤ 0.25 μg/ml) being about ≈ 30 fold more active than the reference compound of fluconazole.
Seltene Erkrankungen der Kieferhöhle
Authors: Hildenbrand T. , Klein S. B. , Schramek N. , Weber R. K. 
Published: June 2020

ZusammenfassungHintergrundDas Silent-Sinus-Syndrom (SSS), das organisierte Hämatom (OH) und der Pneumosinus dilatans (PD) sind seltene, meist einseitige Erkrankungen der Kieferhöhle. Häufig kommt es aufgrund einer Fehleinschätzung entweder zu einem Übermaß oder zu einer Verzögerung von Diagnostik und Therapie.Ziel der ArbeitErarbeitung sinnvoller und nachvollziehbarer Kriterien für eine verbesserte Diagnosestellung und Therapie dieser Erkrankungen.MethodenIn einer retrospektiven Fallserie wurden alle im Zeitraum 01.01.2012–30.06.2019 stationär behandelten Patienten mit den Diagnosen SSS, OH und PD identifiziert. Die Anamnese und Diagnostik mit Befunden sowie der postoperative Verlauf wurden ausgewertet und mit der Literatur verglichen.ErgebnisseIm betrachteten Zeitraum wurden 7 Patienten mit SSS, 3 Patienten mit PD und 2 Patient mit OH behandelt und konnten nachuntersucht werden. Durch den Vergleich unseres Patientenkollektivs mit der Literatur konnten typische Diagnosekriterien erarbeitet werden.SchlussfolgerungDie anamnestischen, endoskopischen und radiologischen Diagnosekriterien sollen die präoperative Diagnose dieser 3 seltenen Erkrankungen der Kieferhöhle erleichtern und eine Abgrenzung gegenüber weiteren Differenzialdiagnosen erleichtern. Auf diese Weise soll die Morbidität aufseiten der Patienten minimiert werden.
Relaxation analysis in a data driven problem with a single outlier
Authors: Röger Matthias , Schweizer Ben 
Published: June 2020

AbstractWe study a scalar elliptic problem in the data driven context. Our interest is to study the relaxation of a data set that consists of the union of a linear relation and single outlier. The data driven relaxation is given by the union of the linear relation and a truncated cone that connects the outlier with the linear subspace.
Temporary materials: comparison of in vivo and in vitro performance
Authors: Sari Tuğrul , Usumez Aslihan , Strasser Thomas , Şahinbas Abdurrahman , Rosentritt Martin 
Published: June 2020

Abstract
Objective
The aim of this investigation was to compare clinical performance and in vitro wear of temporary CAD/CAM and cartridge crowns. This study is an approach to estimate the influence of in vivo use and laboratory simulation on temporary crowns.

Materials and methods
A total of 90 crowns were fabricated from each temporary CAD/CAM or cartridge material. Also, 10 crowns of each material were clinically applied for 14 days, and 80 identical duplicate restorations were investigated in the laboratory after storage in water (14 days; 37 °C) and subsequent thermal cycling and mechanical loading (TCML, 240.000 × 50N ML, 600 × 5°C/55 °C). After in vivo application or in vitro aging, facture force, superficial wear (mean and maximum), surface roughness (Ra, Rz), thermal weight loss (TGA), and heat of reaction (DSC) were determined for all crowns. Statistics: Bonferroni post hoc test; one-way analysis of variance (ANOVA); α = 0.05).

Results
The fracture resistance of the temporary materials varied between 1196.4 (CAD in vivo) and 1598.3 N (cartridge crown in vitro). Mean (maximum) wear data between 204.7 (386.7 μm; cartridge in vitro) and 353.0 μm (621.8 μm; CAD in vitro) were found. Ra values ranged between 4.4 and 4.9 μm and Rz values between 36.0 and 40.8 μm. DSC and TG analysis revealed small differences between the materials but a strong influence of the aging process.

Conclusions
Comparison of in vivo and in vitro aging led to no significant differences in fracture force and wear but differences in roughness, DSC, and TGA. SEM evaluation confirmed comparability. Comparison of CAD/CAM and cartridge temporary materials partially showed significant differences.

Clinical relevance
In vitro aging methods might be helpful to estimate materials’ properties before principal clinical application. CAD/CAM and cartridge temporary materials provided comparable good clinical performance.
Ototoxicity and Platinum Uptake Following Cyclic Administration of Platinum-Based Chemotherapeutic Agents
Authors: Gersten Benjamin K. , Fitzgerald Tracy S. , Fernandez Katharine A. , Cunningham Lisa L. 
Published: June 2020

AbstractCisplatin is a widely used anti-cancer drug used to treat a variety of cancer types. One of the side effects of this life-saving drug is irreversible ototoxicity, resulting in permanent hearing loss in many patients. In order to understand why cisplatin is particularly toxic to the inner ear, we compared the hearing loss and cochlear uptake of cisplatin to that of two related drugs, carboplatin and oxaliplatin. These three drugs are similar in that each contains a core platinum atom; however, carboplatin and oxaliplatin are considered less ototoxic than cisplatin. We delivered these three drugs to mice using a 6-week cyclic drug administration protocol. We performed the experiment twice, once using equimolar concentrations of the drugs and once using concentrations of the drugs more proportional to those used in the clinic. For both concentrations, we detected a significant hearing loss caused by cisplatin and no hearing loss caused by carboplatin or oxaliplatin. Cochlear uptake of each drug was measured using inductively coupled plasma mass spectrometry (ICP-MS) to detect platinum. Cochlear platinum levels were highest in mice treated with cisplatin followed by oxaliplatin, while carboplatin was largely excluded from the cochlea. Even when the drug doses were increased, cochlear platinum remained low in mice treated with oxaliplatin or carboplatin. We also examined drug clearance from the inner ear by measuring platinum levels at 1 h and 24 h after drug administration. Our findings suggest that the reduced cochlear platinum we observed with oxaliplatin and carboplatin were not due to increased clearance of these drugs relative to cisplatin. Taken together, our data indicate that the differential ototoxicity among cisplatin, carboplatin, and oxaliplatin is attributable to differences in cochlear uptake of these three drugs.