bluuebunny/crossref_metadata_2025 huggingface dataset:
Predictors of the pulsatility index in the middle cerebral artery of acute stroke patients
Authors: Bill Olivier , Lambrou Dimitris , Sotomayor Guillermo Toledo , Meyer Ivo , Michel Patrik , Moreira Tiago , Niederhauser Julien , Hirt Lorenz
Published: October 2020

Cervical and transcranial Doppler (TCD) are widely used as non-invasive methods in the evaluation of acute ischemic stroke (AIS) patients. High-grade carotid artery stenosis induces haemodynamic changes such as collateral flow and a so-called post-stenotic flow pattern of the middle cerebral artery (MCA), which appears flattened, with a reduction of the velocity difference between systole and diastole. We studied the influence of carotid artery stenosis and other variables on the flow pattern in the MCA using the pulsatility index (PI), a quantitative TCD parameter reflecting the flow spectrum in a large of cohort AIS patients. We performed ultrasound examinations of 1825 AIS patients at the CHUV from October 2004 to December 2014. We extracted patient characteristics from the ASTRAL registry. Carotid stenosis severity was classified as < 50%, 50–70%, 70–90% and > 90%, or occlusion, according to Doppler velocity criteria. We first determined variables associated with stenosis grade. Then we performed a multivariate analysis after adjusting for baseline differences, using MCA PI as dependent variable. Carotid stenosis > 70% (− 0.07) and carotid stenosis > 90%, or occlusion (− 0.14) and left side (− 0.02) are associated with lower MCA PI values. Age (+0.006 PI units per decade), diabetes (+0.07), acute ischemic changes on initial CT (+0.03) and severe plaque morphology (+0.18) are associated with higher MCA PI values. We found a number of clinical and radiological conditions that significantly influence the PI of the MCA, including high-grade ipsilateral carotid stenosis in AIS patients. We provide for the first time a quantitative evaluation of the effect of these influencing factors from a large cohort of AIS patients.
The non-Newtonian maxwell nanofluid flow between two parallel rotating disks under the effects of magnetic field
Authors: Ahmadian Ali , Bilal Muhammad , Khan Muhammad Altaf , Asjad Muhammad Imran
Published: October 2020

The main feature of the present numerical model is to explore the behavior of Maxwell nanoliquid moving within two horizontal rotating disks. The disks are stretchable and subjected to a magnetic field in axial direction. The time dependent characteristics of thermal conductivity have been considered to scrutinize the heat transfer phenomena. The thermophoresis and Brownian motion features of nanoliquid are studied with Buongiorno model. The lower and upper disk's rotation for both the cases, same direction as well as opposite direction of rotation is investigated. The subsequent arrangement of the three dimensional Navier Stoke’s equations along with energy, mass and Maxwell equations are diminished to a dimensionless system of equations through the Von Karman’s similarity framework. The comparative numerical arrangement of modeled equations is further set up by built-in numerical scheme “boundary value solver” (Bvp4c) and Runge Kutta fourth order method (RK4). The various physical constraints, such as Prandtl number, thermal conductivity, magnetic field, thermal radiation, time relaxation, Brownian motion and thermophoresis parameters and their impact are presented and discussed briefly for velocity, temperature, concentration and magnetic strength profiles. In the present analysis, some vital characteristics such as Nusselt and Sherwood numbers are considered for physical and numerical investigation. The outcomes concluded that the disk stretching action opposing the flow behavior. With the increases of magnetic field parameter $$M$$
M
the fluid velocity decreases, while improving its temperature. We show a good agreement of the present work by comparing with those published in literature.
Usefulness of a novel device to divide core needle biopsy specimens in a spatially matched fashion
Authors: Shiraishi Takumi , Inui Shogo , Inoue Yuta , Saito Yumiko , Taga Hideto , Kaneko Masatomo , Tsuji Keisuke , Ueda Saya , Ueda Takashi , Matsugasumi Toru , Taniguchi Hidefumi , Ueno Akihisa , Yamada Takeshi , Yamada Yasuhiro , Iwata Tsuyoshi , Fujihara Atsuko , Hongo Fumiya , Ukimura Osamu
Published: October 2020

We developed a novel dividing device that can split needle biopsy tissues along longitude axis aiming to achieve definitive molecular-biological and genetical analysis with reference of pathological diagnosis of the side-by-side divided tissue as spatially matched information. The aim of this study was to evaluate the feasibility and potential usefulness of the novel dividing device to provide the appropriate materials for molecular diagnosis. The new device was examined using mouse xenograft tumors. Real-time quantitative PCR and genetic test were performed to evaluate the feasibility and usefulness of the device. All the samples from needle biopsy were successfully divided into two pieces. Quality and quantity from divided samples harbor high enough to perform gene expression analysis (real-time PCR) and genetic test. Using two divided samples obtained from xenograft tumor model by needle biopsy, the % length of xenograft tumor (human origin) was significantly correlated with the % human genomic DNA (p = 0.00000608, r = 0.987), indicating that these divided samples were spatially matched. The novel longitudinally dividing device of a needle biopsy tissue was useful to provide the appropriate materials for molecular-biological and genetical analysis with reference of pathological diagnosis as spatially matched information.
Publisher Correction: Ultrasound-assisted intralesional corticosteroid infiltrations for patients with hidradenitis suppurativa
Authors: Salvador‑Rodriguez Luis , Arias‑Santiago Salvador , Molina‑Leyva Alejandro
Published: October 2020

An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Association of foveal avascular zone with the metamorphopsia in epiretinal membrane
Authors: Shiihara Hideki , Terasaki Hiroto , Sonoda Shozo , Kakiuchi Naoko , Yamaji Hidetaka , Yamaoka Shinnosuke , Uno Toshihiko , Watanabe Mutsumi , Sakamoto Taiji
Published: October 2020

This study was to investigate the relationship between the metamorphopsia and foveal avascular zone (FAZ) parameter in eyes with epiratinal membrane (ERM). We studied patients with an ERM visited retinal service unit at the Kagoshima University Hospital or Shirai Hospital. The best-corrected visual acuity (BCVA), and the degree of metamorphopsia by M -CHARTS™ were evaluated. The 3 × 3 mm optical coherence tomography angiography (OCTA) images of the superficial layer were obtained. Area (mm2), the circularity, eigen value were calculated using ImageJ software. The relationship between visual function, such as best corrected visual acuity (BCVA) and metamorphopsia, and FAZ parameters were studied by Pearson’s correlational coefficient. Fifty-four eyes of 51 patients (24 men and 27 women) with an ERM were studied. The mean age of the patients was 69.6 ± 8.20 years. The mean BCVA and metamorphopsia score was 0.31 ± 0.29 logMAR units and 0.49 ± 0.42. There was no significant relationship between BCVA and FAZ parameters. While, metamorphopsia score was significantly and negatively correlated with all of FAZ parameters (area R = − 0.491, P < 0.001; circularity R = − 0.385, P = 0.004; eigenvalue ratio R = − 0.341; P = 0.012). Multiple regression analysis showed the FAZ area was solely and significantly correlated with metamorphopsia score (β − 0.479, P < 0.001). The size but not the shape of the FAZ was significantly correlated with the degree of metamorphopsia suggesting that it could be an objective parameter of metamorphopsia in ERM patients.
Ellipsometric spectroscopy of rubidium vapor cell at near-normal incidence
Authors: Mosleh M. , Ranjbaran M. , Hamidi S. M. , Tehranchi M. M.
Published: October 2020

Various efforts have been made to overcome Doppler broadening in hyperfine measurement limitations in the atomic vapors spectroscopy and associated applications. The present study measured and calculated hyperfine resolved ellipsometric parameters through the near-normal reflectance spectra of the rubidium vapor cell in two experimental setups based on continuous and modulated pathway. The results indicated that valuable information could be extracted from the ellipsometric parameters about the atomic medium. Change in the ellipsometric parameters in each transition line confirms the existence of the elliptical polarization of the reflected light when it is exposed to the alkali metal vapor. Our results show that the ellipticity at 5S1/2 (Fg = 1, 2) → 5P1/2 (Fe = 1, 2) hyperfine transitions of 87Rb (D1 line) is small, and accordingly hyperfine transitions between the ground 5S1/2 (Fg = 2, 3) and excited 5P1/2 (Fe = 2, 3) states of the 85Rb isotope are considerable. These ellipsometric parameters, as phase difference, can trace the behavior of the relative orientation of the electric field and atom velocity in the interface based on van der Waals dipole–dipole interaction and is directly proportional to the strength of the light-matter interaction which extremely useful instead complicated atomic spectroscopic methods.
Nonlinear association between blood lead and hyperhomocysteinemia among adults in the United States
Authors: Li Minghui , Hu Lihua , Zhou Wei , Wang Tao , Zhu Lingjuan , Zhai Zhenyu , Bao Huihui , Cheng Xiaoshu
Published: October 2020

Evidence regarding the association between blood lead levels (BLL) and hyperhomocysteinemia (HHcy) in US adults was limited. We aimed to investigate the association of BLL with the risk of HHcy, and to examine possible effect modifiers using US National Health and Nutrition Examination Survey (NHANES) database. We performed a cross-sectional study using data from up to 9,331 participants aged ≥ 20 years of NHANES from 2001 to 2006. BLL was measured by atomic absorption spectrometry. HHcy was defined as plasma homocysteine level > 15 µmol/L. The weighted prevalence of HHcy was 6.87%. The overall mean BLL was 1.9 μg/dL. Overall, there was a nonlinear positive association between Ln-transformed BLL (LnBLL) and the risk of HHcy. The Odds ratios (95% CI) for participants in the second (0.04–0.49 μg/dL), third (0.5–0.95 μg/dL) and fourth quartiles (> 0.95 μg/dL) were 1.12 (95% CI: 0.71, 1.76), 1.13 (95% CI: 0.73, 1.77), and 1.67 (95% CI: 1.07, 2.61), respectively, compared with those in quartile 1. Consistently, a significantly higher risk of HHcy (OR: 1.49; 95% CI: 1.19, 1.88) was found in participants in quartile 4 compared with those in quartiles 1–3. Furthermore, a strongly positive association between LnBLL and HHcy was observed in participants with estimated glomerular filtration rate (eGFR) < 60 mL/min−1/1.73 m−2. Our results suggested that a higher level of BLL (LnBLL > 0.95 μg/dL) was associated with increased risk of HHcy compared with a lower level of BLL (LnBLL ≤ 0.95 μg/dL) among U.S. adults, and the association was modified by the eGFR.
Characterization of thymine microcrystals by CARS and SHG microscopy
Authors: Dementjev Andrej , Rutkauskas Danielis , Polovy Ivan , Macernis Mindaugas , Abramavicius Darius , Valkunas Leonas , Dovbeshko Galina
Published: October 2020

Identification of chemically homologous microcrystals in a polycrystal sample is a big challenge and requires developing specific highly sensitive tools. Second harmonic (SHG) and coherent anti-Stokes Raman scattering (CARS) spectroscopy can be used to reveal arrangement of thymine molecules, one of the DNA bases, in microcrystalline sample. Strong dependence of CARS and SHG intensity on the orientation of the linear polarization of the excitation light allows to obtain high resolution images of thymine microcrystals by additionally utilizing the scanning microscopy technique. Experimental findings and theoretical interpretation of the results are compared. Presented experimental data together with quantum chemistry-based theoretical interpretation allowed us to determine the most probable organization of the thymine molecules.
Mechanochemical conversion kinetics of red to black phosphorus and scaling parameters for high volume synthesis
Authors: Pedersen Samuel V. , Muramutsa Florent , Wood Joshua D. , Husko Chad , Estrada David , Jaques Brian J.
Published: October 2020

Adopting black phosphorus (BP) as a material in electronic and optoelectronic device manufacturing requires the development and understanding of a large-scale synthesis technique. To that end, high-energy planetary ball milling is demonstrated as a scalable synthesis route, and the mechanisms and conversion kinetics of the BP phase transformation are investigated. During the milling process, media collisions rapidly compress amorphous red phosphorus (RP) into crystalline, orthorhombic BP flakes, resulting in a conversion yield of ≈90% for ≈5 g of bulk BP powder. Milling conversion kinetics, monitored via ex situ x-ray diffraction, manifest a sigmoidal behavior best described by the Avrami rate model with each impact of sufficient energy (>25 mJ) producing BP nuclei; the process appears to be limited by grain growth. Using a kinematic model for ball trajectories and impact energies, the optimum milling condition is determined to be an impact energy near ≈25 mJ and a milling dose near ≈100 kJ/gram. Photoexcitation of exfoliated BP flakes reveals emission in the near-infrared, indicating the formation of few-layer BP, a promising advance for optoelectronic device applications.
Early detection and tracking of bulbar changes in ALS via frequent and remote speech analysis
Authors: Stegmann Gabriela M. , Hahn Shira , Liss Julie , Shefner Jeremy , Rutkove Seward , Shelton Kerisa , Duncan Cayla Jessica , Berisha Visar
Published: October 2020

Bulbar deterioration in amyotrophic lateral sclerosis (ALS) is a devastating characteristic that impairs patients’ ability to communicate, and is linked to shorter survival. The existing clinical instruments for assessing bulbar function lack sensitivity to early changes. In this paper, using a cohort of N = 65 ALS patients who provided regular speech samples for 3–9 months, we demonstrated that it is possible to remotely detect early speech changes and track speech progression in ALS via automated algorithmic assessment of speech collected digitally.
Protein-crystal detection with a compact multimodal multiphoton microscope
Authors: Cheng Qing-di , Chung Hsiang-Yu , Schubert Robin , Chia Shih-Hsuan , Falke Sven , Mudogo Celestin Nzanzu , Kärtner Franz X. , Chang Guoqing , Betzel Christian
Published: October 2020

There is an increasing demand for rapid, effective methods to identify and detect protein micro- and nano-crystal suspensions for serial diffraction data collection at X-ray free-electron lasers or high-intensity micro-focus synchrotron radiation sources. Here, we demonstrate a compact multimodal, multiphoton microscope, driven by a fiber-based ultrafast laser, enabling excitation wavelengths at 775 nm and 1300 nm for nonlinear optical imaging, which simultaneously records second-harmonic generation, third-harmonic generation and three-photon excited ultraviolet fluorescence to identify and detect protein crystals with high sensitivity. The instrument serves as a valuable and important tool supporting sample scoring and sample optimization in biomolecular crystallography, which we hope will increase the capabilities and productivity of serial diffraction data collection in the future.
Structural role of essential light chains in the apicomplexan glideosome
Authors: Pazicky Samuel , Dhamotharan Karthikeyan , Kaszuba Karol , Mertens Haydyn D. T. , Gilberger Tim , Svergun Dmitri , Kosinski Jan , Weininger Ulrich , Löw Christian
Published: October 2020

Gliding, a type of motility based on an actin-myosin motor, is specific to apicomplexan parasites. Myosin A binds two light chains which further interact with glideosome associated proteins and assemble into the glideosome. The role of individual glideosome proteins is unclear due to the lack of structures of larger glideosome assemblies. Here, we investigate the role of essential light chains (ELCs) in Toxoplasma gondii and Plasmodium falciparum and present their crystal structures as part of trimeric sub-complexes. We show that although ELCs bind a conserved MyoA sequence, P. falciparum ELC adopts a distinct structure in the free and MyoA-bound state. We suggest that ELCs enhance MyoA performance by inducing secondary structure in MyoA and thus stiffen its lever arm. Structural and biophysical analysis reveals that calcium binding has no influence on the structure of ELCs. Our work represents a further step towards understanding the mechanism of gliding in Apicomplexa.
Author Correction: Laser cooling of ytterbium-doped silica glass
Authors: Mobini Esmaeil , Rostami Saeid , Peysokhan Mostafa , Albrecht Alexander , Kuhn Stefan , Hein Sigrun , Hupel Christian , Nold Johannes , Haarlammert Nicoletta , Schreiber Thomas , Eberhardt Ramona , Tünnermann Andreas , Sheik-Bahae Mansoor , Mafi Arash
Published: October 2020

An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Analysis of benzodiazepines by thermal desorption direct analysis in real time mass spectrometry (TD-DART-MS)
Authors: Jones Sydney , Sisco Edward , Marginean Ioan
Published: October 2020

TD-DART-MS was shown to accurately and sensitively detect a wide range of benzodiazepines.
Is DAPI assay of cellular nucleic acid reliable in the presence of protein aggregates?
Authors: Mora Aruna K. , Khan Sufiyan , Patro Birija S. , Nath Sukhendu
Published: October 2020

Intracellular amyloid fibrils prevent exclusive staining of nuclei by DAPI.
Selective C–C bond cleavage of amides fused to 8-aminoquinoline controlled by a catalyst and an oxidant
Authors: Li Sen , Jie Kun , Yan Wenjie , Pan Qingjun , Zhang Min , Wang Yufeng , Fu Zhengjiang , Guo Shengmei , Cai Hu
Published: October 2020

Herein, copper-catalyzed direct C–C bond cleavage of amides fused to 8-aminoquinoline as a directing group to form urea in the presence of amines and dioxygen is reported.
Revisiting amorphous molybdenum sulfide's activity for the electro-driven reduction of dinitrogen and N-containing substrates
Authors: Yang Kun , Koepf Matthieu , Artero Vincent
Published: October 2020

Amorphous molybdenum sulfide exhibits partial nitrogenase-like activity allowing for the electro driven reduction of azides under aqueous conditions.
Dynamically tuning transient silicone polymer networks with hydrogen bonding
Authors: Yepremyan Akop , Osamudiamen Andrew , Brook Michael A. , Feinle Andrea
Published: October 2020

Hydrogen bonds on a silicone polymer permit supramolecular silicones to form transient polymer networks with energy absorbing properties that depend on the number of available OH groups.
Detection of pollutants in water bodies: electrochemical detection or photo-electrochemical detection?
Authors: Li Zhi , Zhu Mingshan
Published: October 2020

Both electrochemical and photo-electrochemical detection methods have been widely used for the detection of environmental pollutants, but which one is better?
New insights into unusual droplets: from mediating the wettability to manipulating the locomotion modes
Authors: Liu Xianchen , Yang Fuchao , Guo Jie , Fu Jing , Guo Zhiguang
Published: October 2020

The ability to manipulate droplets can be utilized to develop various smart sensors or actuators, endowing them with fascinating applications for drug delivery, detection of target analytes, environmental monitoring, intelligent control, and so on.
Enantioselective dearomative [3+2] annulation of 5-amino-isoxazoles with quinone monoimines
Authors: Liu Hui , Yan Yingkun , Zhang Jiayan , Liu Min , Cheng Shaobing , Wang Zhouyu , Zhang Xiaomei
Published: October 2020

Enantioselective dearomative [3+2] annulation of 5-amino-isoxazoles with quinone monoimines provided various (bridged) isoxazolines fused dihydrobenzofurans with moderate to good yields in moderate to good enantioselectivities.
Arylation of aryllithiums with S-arylphenothiazinium ions for biaryl synthesis
Authors: Morofuji Tatsuya , Yoshida Tatsuki , Tsutsumi Ryosuke , Yamanaka Masahiro , Kano Naokazu
Published: October 2020

Aryllithiums were arylated with S-arylphenothiazinium ions through selective ligand coupling of intermediary sulfuranes. Various unsymmetrical biaryls were obtained without transition-metal catalysis.
A thermolytic route to a polysilyne
Authors: Lee Peter T. K. , Samedov Kerim , Belli Roman G. , Clarke C. Jonathan , Gates Derek P. , Rosenberg Lisa
Published: October 2020

Thermal rearrangement of a linear polysilane gives a new, hyperbranched polymer reminiscent of classic polysilynes, without hazardous reductive coupling.
Bench-stable imine surrogates for the one-pot and catalytic asymmetric synthesis of α-amino esters/ketones
Authors: Xu Huacheng , Nazli Adila , Zou Cheng , Wang Zhi-Peng , He Yun
Published: October 2020

An unpresented catalytic asymmetric method for the synthesis of α-amino esters and ketones from novel imine surrogates is reported.
Progress on cocrystallization of poorly soluble NME's in the last decade
Authors: Roy Parag , Ghosh Animesh
Published: October 2020

Cocrystallization of pharmaceuticals has been an exciting field of interest to both academia and industries, demonstrated from its increasing growth rate of publications, patents, and marketed formulations.
Understanding the electrochemical properties of bulk phase and surface structures of Na3TMPO4CO3(TM= Fe, Mn, Co, Ni) from first principles calculations
Authors: Li Yuhan , Tang Shuwei , Zhang Jingping , Yamashita Koichi , Ni Lei
Published: October 2020

First-principle calculations suggest that enlarging the specific area of surfaces (110), (101) and (12−1) can enhance the electrochemical performance of Na3MnPO4CO3.
Brushes and lamellar mesophases of comb-shaped (co)polymers: a self-consistent field theory
Authors: Mikhailov Ivan V. , Zhulina Ekaterina B. , Borisov Oleg V.
Published: October 2020

Superimposed distributions of main chain ends in brush of comb polymers with different length and grafting density of side chains.
From megahertz to terahertz qubits encoded in molecular ions: theoretical analysis of dipole-forbidden spectroscopic transitions in N2+
Authors: Najafian Kaveh , Meir Ziv , Willitsch Stefan
Published: October 2020

Theoretical study of the implementation of qubits and clock transitions in the spin, rotational, and vibrational degrees of freedom of molecular nitrogen ions including the effect of magnetic fields.
Energy conversion based on superhydrophobic surfaces
Authors: Chen Yang , Liu Jiyu , Song Jinlong , Liu Rui , Zhao Danyang , Hua Shungang , Lu Yao
Published: October 2020

Different forms of energy conversion based on superhydrophobic surfaces.
Temperature- and pressure-dependent rate coefficient measurement for the reaction of CH2OO with CH3CH2CHO
Authors: Liu Yiqiang , Zhou Xiaohu , Chen Yang , Chen Maodu , Xiao Chunlei , Dong Wenrui , Yang Xueming
Published: October 2020

The rate coefficients of the CH2OO + CH3CH2CHO reaction were studied at temperatures and pressures in the range of 283–318 K and 5–200 Torr.
Palladium-catalysed methoxycarbonylation of ethene with bidentate diphosphine ligands: a density functional theory study
Authors: Ahmad Shahbaz , Crawford L. Ellis , Bühl Michael
Published: October 2020

The mechanism and origin of selectivity of Pd-catalysed formation of methyl propionate is elucidated through DFT calculations.
Site-specific dynamic nuclear polarization in a Gd(iii)-labeled protein
Authors: Heiliger Jörg , Matzel Tobias , Çetiner Erhan Can , Schwalbe Harald , Kuenze Georg , Corzilius Björn
Published: October 2020

Direct DNP transfer rates can be used to measure electron–nuclear distances and to provide site-specificity in NMR.
Low-coordinate Sm(ii) and Yb(ii) complexes derived from sterically-hindered 1,2-bis(imino)acenaphthene (ArBIG-bian)
Authors: Lukina Daria A. , Skatova Alexandra A. , Sokolov Vladimir G. , Baranov Evgenii V. , Demeshko Serhiy , Ketkov Sergey Yu. , Fedushkin Igor L.
Published: October 2020

Reduction of ArBIG-bian with metallic Sm or Yb affords monomeric Ln(ii) complexes. In (ArBIG-bian)Sm, the metal reveals a low coordination number. The stabilization of the Sm center is provided by interaction with three Ph rings.
Microfluidic platform for integrated compartmentalization of single zoospores, germination and measurement of protrusive force generated by germ tubes
Authors: Sun Yiling , Tayagui Ayelen , Garrill Ashley , Nock Volker
Published: October 2020

We introduce a platform capable of trapping and compartmentalizing spores of oomycetes and fungi for germination and protrusive force sensing on individual germ tubes.
Microgel organocatalysts: modulation of reaction rates at liquid–liquid interfaces
Authors: Kleinschmidt Denise , Nothdurft Katja , Anakhov Mikhail V. , Meyer Anna A. , Mork Matthias , Gumerov Rustam A. , Potemkin Igor I. , Richtering Walter , Pich Andrij
Published: October 2020

Responsive colloidal microgel-catalysts were applied to an aldol reaction to study how temperature and the effect of cononsolvency can be used as triggers to modulate reaction rates in homogenous phase and on liquid–liquid interfaces.
Electrospray-based synthesis of fluorescent poly(d,l-lactide-co-glycolide) nanoparticles for the efficient delivery of an anticancer drug and self-monitoring its effect in drug-resistant breast cancer cells
Authors: Chatterjee Manosree , Maity Ritwik , Das Souvik , Mahata Nibedita , Basu Biswarup , Chanda Nripen
Published: October 2020

A novel approach used to synthesize antimetabolite-conjugated and intense blue fluorescence-emitting smart polymeric nanoparticles is reported for the efficient delivery of anticancer drugs and self-monitoring their effect in drug-resistant metastatic breast cancer cells.
Overview of sterilization methods for UHMWPE through surface analysis
Authors: Machado Rodrigues Melissa , Kerstner Baldin Estela K. , Fontoura Cristian Padilha , Leidens Leonardo Mathias , Barbieri Rodrigo Antônio , Frassini Rafaele , de Fraga Malfatti Célia , Roesch-Ely Mariana , Figueroa Carlos Alejandro , Aguzzoli Cesar
Published: October 2020

A comprehensive study on the effects of sterilization methods on UHMWPE is reported, highlighting surface properties and biological outcomes.
Novel paraben derivatives of tetracyclic spermine cyclotriphosphazenes: synthesis, characterization and biosensor based DNA interaction analysis
Authors: Kızılkaya Perihan , Şenkuytu Elif , Davarcı Derya , Pala Uğur , Ölçer Zehra , Yenilmez Çiftçi Gönül
Published: October 2020

A new series of paraben-substituted dispiroansa (tetracyclic) spermine derivatives of cyclotriphosphazenes likely to be biologically active were synthesized for the first time and their effects on DNA were studied.
Synthesis and electrochemical characterization of a new benzodioxocine-fused poly(N-methylpyrrole) derivative: a joint experimental and DFT study
Authors: Kurtay Gülbin , Soganci Tugba , Sarikavak Kübra , Ak Metin , Güllü Mustafa
Published: October 2020

Synthesis of a new electropolymerizable monomer, XyPMe, regarding the reaction of diethylN-methyl-3,4-dihydroxypyrrole-2,5-dicarboxylate and 1,2-bis(bromomethyl)benzene with concomitant hydrolysis and decarboxylation reactions was accomplished.
D–A type luminophores with a twisted molecular conformation constructed by phenoxazine and diphenylsulfone showing high contrast mechanofluorochromism
Authors: Zhou Hongke , Zhang Zhan , Liu Xingliang , Xu Defang , Zhang Weidong , Fu Shengjie , Feng Xiucun , Huang Qian
Published: October 2020

Two new stimulus-response luminescence materials PXZ-DPS and BPXZ-DPS possessing the twisted molecular conformation exhibit a unique ICT effect, effective solid-state fluorescence, and high-contrast and reversible mechanofluorochromism.
2.2.2-Cryptand as a bidentate ligand in rare-earth metal chemistry
Authors: Chung Amanda B. , Huh Daniel N. , Ziller Joseph W. , Evans William J.
Published: October 2020

Crystal structures demonstrate that 2.2.2-cryptand can function as a κ2-O,O′ bidentate ligand to rare-earth metal ions.
Thermodynamic insights into interfacial interactions in TiN/amorphous Al2O3 heterostructures: ab initio molecular dynamics and first principles investigation
Authors: Park Hwanyeol , Han Dong-Hoon , Lim Hong Taek , Yoon Euijoon , Lee Gun-Do
Published: October 2020

The nature and the mechanism of the film interaction with the substrate at the film/substrate interface are still far from being fully understood.
Li(Na)2FeSiO4/C hybrid nanotubes: promising anode materials for lithium/sodium ion batteries
Authors: Tang Yakun , Gao Yang , Liu Lang , Zhang Yue , Xie Jing , Zeng Xingyan
Published: October 2020

Porous Li(Na)2FeSiO4/C hybrid nanotubes were successfully synthesized by a modified sol–gel strategy and a subsequent calcination process. These nanohybrids exhibited excellent electrochemical performances as anodes for lithium/sodium ion batteries.
Poplar flower-like nitrogen-doped carbon nanotube@VS4 composites with excellent sodium storage performance
Authors: Yang Fei , Zhong Wen , Ren Manman , Liu Weiliang , Li Mei , Li Guangda , Su Liwei
Published: October 2020

As a new anode material for sodium-ion batteries (SIBs), VS4 shows impressive energy storage potential due to its unique one-dimensional parallel chain structure, large chain spacing and high sulfur content.
Achieving enhanced ML or RTP performance: alkyl substituent effect on the fine-tuning of molecular packing
Authors: Yu Yun , Fan Yuanyuan , Wang Can , Wei Yao , Liao Qiuyan , Li Qianqian , Li Zhen
Published: October 2020

By changing the substituted alkyl chain of PIth–C derivatives to well regulate the stacking angles of molecular dimers, and considering the efficient intermolecular interactions, their ML/RTP performance could be well tuned.
Direct measurement of K+ ion efflux from neuronal cells using a graphene-based ion sensitive field effect transistor
Authors: Li Hongmei , Walsh Kenneth B , Bayram Ferhat , Koley Goutam
Published: October 2020

A graphene-based ISFET has been developed and demonstrated high sensitivity and direct measurement of K+ ion efflux from live cells.
Cadmium sulfide net framework nanoparticles for photo-catalyzed cell redox
Authors: Chang Zhaoyu , Zhang Jian , Dong Wanyuan , Meng Xiangqi , Wang Hualei , Wei Dongzhi , Ren Yuhong
Published: October 2020

CdS net framework (CdS-NF) nanoparticles were synthesized under mild reaction conditions and used to construct an Escherichia coli–CdS-NF hybrid system which used NADH regeneration to promote the redox reaction.
Morphology of Cu clusters supported on reconstructed polar ZnO (0001) and (0001̄) surfaces
Authors: Higham Michael D. , Mora-Fonz David , Sokol Alexey A. , Woodley Scott M. , Catlow C. Richard A.
Published: October 2020

Unbiased Monte Carlo procedures are applied to investigate the structure of Cu clusters of various sizes deposited over reconstructed polar ZnO surfaces.
Sonication-induced electrostatic assembly of an FeCO3@Ti3C2 nanocomposite for robust lithium storage
Authors: Yang Shiqi , Yao Junyi , Hu Huimin , Zeng Youze , Huang Xue , Liu Tingting , Bu Liangmin , Tian Kai , Lin Yanping , Li Xiangyi , Jiang Shuli , Zhou Shaowen , Li Wanying , Bashir Tariq , Choi Jin-Ho , Gao Lijun , Zhao Jianqing
Published: October 2020

The sonication-induced electrostatic assembly plays an important role in composite construction and chemical bonding of active FeCO3 nanorods and a Ti3C2 substrate towards superior cycling and rate performance for lithium storage.
Porous cobalt/tungsten nitride polyhedra as efficient bifunctional electrocatalysts for overall water splitting
Authors: Wu Aiping , Gu Ying , Yang Bairui , Wu Han , Yan Haijing , Jiao Yanqing , Wang Dongxu , Tian Chungui , Fu Honggang
Published: October 2020

A porous polyhedral Co/WN heterojunction catalyst was successfully synthesized as an efficient bifunctional electrocatalyst for overall water splitting.
Unravelling the effect of fluorinated ligands in hybrid EUV photoresists by X-ray spectroscopy
Authors: Wu Lianjia , Bespalov Ivan , Witte Katharina , Lugier Olivier , Haitjema Jarich , Vockenhuber Michaela , Ekinci Yasin , Watts Benjamin , Brouwer Albert M. , Castellanos Sonia
Published: October 2020

A fluorinated ligand in an extreme ultraviolet hybrid photoresist yields C–F bond dissociation upon exposure, thus enhancing its overall sensitivity.
Effects of polymer crystallinity on non-fullerene acceptor based organic solar cell photostability
Authors: Yi Xueping , Ho Carr Hoi Yi , Gautam Bhoj , Lei Lei , Chowdhury Ashraful Haider , Bahrami Behzad , Qiao Qiquan , So Franky
Published: October 2020

Organic solar cell shows significantly different degradation rate with different donor polymer crystallinity, even the donors and acceptors are all photostable.
A supramolecular photonic crystal hydrogel based on host–guest interactions for organic molecule recognition
Authors: Sun Yongqi , Wang Dan , Long Yue , Li Lu , Du Kuishan , Hou Kai , Ji Jiecheng , Yang Cheng , Zhong Kuo , Cai Huaqiang , Li Jinshan , Song Kai
Published: October 2020

The host component β-cyclodextrin (β-CD) and the guest component tertiary-butyl (t-Bu) were introduced into the polymeric backbone material of an inverse opal hydrogel.
0.67‐μm2 /bitcell two‐transistor leakage‐based physically unclonable function with native bit‐instability of 0.89% at 65 nm
Authors: Li Gang , Wang Pengjun , Ma Xuejiao , Chen Bo
Published: October 2020

A compact and robust physically unclonable function (PUF) for secure key generation is proposed. With the help of a cross‐coupled amplifier, the leakage‐current mismatch between the two transistors was digitised to produce a unique chip identification. The measurement results show that the proposed PUF has the best‐in‐class randomness and uniqueness, as well as the following features: (i) an ultra‐small PUF cell with a minimum feature size of 159 F2, being the lowest reported to date in CMOS, (ii) a low native BER (bit‐instability) of 0.16% (0.89%) was measured at the golden condition, and (iii) an autocorrelation of 0.007 at 95% confidence was achieved.
Investigation of electrical characteristics of residential light bulbs in load modelling studies with novel similarity score method
Authors: Doğan Rasim , Akarslan Emre
Published: October 2020

In load modelling studies, the behaviour and electrical characteristic of a load are the main entries used in the identification of that load. This study is focused on the electrical characteristics of light bulbs (compact fluorescent light, fluorescent, incandescent, and light‐emitting diode) with different characteristics that can be found in a house. While discovering these characteristics, current waveforms were used and electrical features were revealed. In addition, a novel method is proposed to identify individual loads by using these features. In this scope, a novel similarity score measure is introduced. In the presented study, similarity score measure is calculated from the total harmonic distortion, power, and harmonic current features. The experiments on randomly selected loads demonstrate that the proposed method successfully identified the loads even if they have similar characteristics or power consumption.
Evolutionary and pulsation properties of Type II Cepheids
Authors: Bono G. , Braga V. F. , Fiorentino G. , Salaris M. , Pietrinferni A. , Castellani M. , Di Criscienzo M. , Fabrizio M. , Martínez-Vázquez C. E. , Monelli M.
Published: October 2020

We discuss the observed pulsation properties of Type II Cepheids (TIICs) in the Galaxy and in the Magellanic Clouds. We found that period (P) distributions, luminosity amplitudes, and population ratios of the three different sub-groups (BL Herculis [BLH, P < 5 days], W Virginis [WV, 5 ≤ P < 20 days], RV Tauri [RVT, P > 20 days]) are quite similar in different stellar systems, suggesting a common evolutionary channel and a mild dependence on both metallicity and environment. We present a homogeneous theoretical framework based on horizontal branch (HB) evolutionary models, showing that TIICs are mainly old (t ≥ 10 Gyr) low-mass stars. The BLH stars (BLHs) are predicted to be post-early asymptotic giant branch (PEAGB) stars (double shell burning) on the verge of reaching their AGB track (first crossing of the instability strip), while WV stars (WVs) are a mix of PEAGB and post-AGB stars (hydrogen shell burning) moving from the cool to the hot side (second crossing) of the Hertzsprung-Russell Diagram. This suggests that they are a single group of variable stars. The RVT stars (RVTs) are predicted to be a mix of post-AGB stars along their second crossing (short-period tail) and thermally pulsing AGB stars (long-period tail) evolving towards their white dwarf cooling sequence. We also present several sets of synthetic HB models by assuming a bi-modal mass distribution along the HB. Theory suggests, in agreement with observations, that TIIC pulsation properties marginally depend on metallicity. Predicted period distributions and population ratios for BLHs agree quite well with observations, while those for WVs and RVTs are almost a factor of two smaller and higher than observed, respectively. Moreover, the predicted period distributions for WVs peak at periods shorter than observed, while those for RVTs display a long-period tail not supported by observations. We investigate several avenues to explain these differences, but more detailed calculations are required to address these discrepancies.
More insights into bar quenching
Authors: George K. , Joseph P. , Mondal C. , Subramanian S. , Subramaniam A. , Paul K. T.
Published: October 2020

The underlying nature of the process of star formation quenching in the central regions of barred disc galaxies that is due to the action of stellar bar is not fully understood. We present a multi-wavelength study of four barred galaxies using the archival data from optical, ultraviolet, infrared, CO, and HI imaging data on star formation progression and stellar and gas distribution to better understand the process of bar quenching. We found that for three galaxies, the region between the nuclear or central sub-kiloparsec region and the end of the bar (bar region) is devoid of neutral and molecular hydrogen. While the detected neutral hydrogen is very negligible, we note that molecular hydrogen is present abundantly in the nuclear or central sub-kiloparsec regions of all four galaxies. The bar co-rotation radius is also devoid of recent star formation for three out of four galaxies. One galaxy shows significant molecular hydrogen along the bar, which might mean that the gas is still being funnelled to the centre by the action of the stellar bar. Significant star formation is also present along the bar co-rotation radius of this galaxy. The study presented here supports a scenario in which gas redistribution as a result of the action of stellar bar clears the bar region of fuel for further star formation and eventually leads to star formation quenching in the bar region.
Ring dynamics around an oblate body with an inclined satellite: the case of Haumea
Authors: Marzari Francesco
Published: October 2020

Context. The recent discovery of rings and massive satellites around minor bodies and dwarf planets suggests that they may often coexist, as for example around Haumea.

Aims. A ring perturbed by an oblate central body and by an inclined satellite may disperse on a short timescale. The conditions under which a ring may survive are explored both analytically and numerically.

Methods. The trajectories of ring particles are integrated under the influence of the gravitational field of a triaxial ellipsoid and (a) massive satellite(s), including the effects of collisions.

Results. A ring initially formed in the equatorial plane of the central body will be disrupted if the satellite has an inclination in the Kozai–Lidov regime (39.2° < i < 144.8). For lower inclinations, the ring may relax to the satellite orbital plane thanks to an intense collisional damping. On the other hand, a significant J2 term easily suppresses the perturbations of an inclined satellite within a critical semi-major axis, even in the case of Kozai–Lidov cycles. However, if the ring is initially inclined with respect to the equatorial plane, the same J2 perturbations are not a protective factor but instead disrupt the ring on a short timescale. The ring found around Haumea is stable despite the rise in the impact velocities that is due to the asymmetric shape of the body and the presence of a 3:1 resonance with the rotation of the central body.

Conclusions. A ring close to an oblate central body should be searched for in the proximity of the equatorial plane, where the J2 perturbations protect it against the perturbations of an external inclined satellites. In an inclined configuration, the J2 term is itself disruptive.
Models of ultraluminous X-ray transient sources
Authors: Hameury J.-M. , Lasota J.-P.
Published: October 2020

Context. It is now widely accepted that most ultraluminous X-ray sources (ULXs) are binary systems whose large (above 1039 erg s−1) apparent luminosities are explained by super-Eddington accretion onto a stellar-mass compact object. Many of the ULXs, especially those containing magnetized neutron stars, are highly variable; some exhibit transient behaviour. Large luminosities might imply large accretion discs that could be therefore prone to the thermal–viscous instability known to drive outbursts of dwarf novae and low-mass X-ray binary transient sources.

Aims. The aim of this paper is to extend and generalize the X-ray transient disc-instability model to the case of large (outer radius larger than 1012 cm) accretion discs and apply it to the description of systems with super-Eddington accretion rates at outburst and, in some cases, super-Eddington mass transfer rates.

Methods. We have used our disc-instability-model code to calculate the time evolution of the accretion disc and the outburst properties.

Results. We show that, provided that self-irradiation of the accretion disc is efficient even when the accretion rate exceeds the Eddington value, possibly due to scattering back of the X-ray flux emitted by the central parts of the disc on the outer portions of the disc, heating fronts can reach the disc’s outer edge generating high accretion rates. We also provide analytical approximations for the observable properties of the outbursts. We have successfully reproduced the observed properties of galactic transients with large discs, such as V404 Cyg, as well as some ULXs such as M51 XT-1. Our model can reproduce the peak luminosity and decay time of ESO 243-39 HLX-1 outbursts if the accretor is a neutron star.

Conclusions. Observational tests of our predicted relations between the outburst duration and decay time with peak luminosity would be most welcome.
Exploiting NIKA2/XMM-Newtonimaging synergy for intermediate-mass high-zgalaxy clusters within the NIKA2 SZ large program
Authors: Kéruzoré F. , Mayet F. , Pratt G. W. , Adam R. , Ade P. , André P. , Andrianasolo A. , Arnaud M. , Aussel H. , Bartalucci I. , Beelen A. , Benoît A. , Berta S. , Bourrion O. , Calvo M. , Catalano A. , De Petris M. , Désert F.-X. , Doyle S. , Driessen E. F. C. , Gomez A. , Goupy J. , Kramer C. , Ladjelate B. , Lagache G. , Leclercq S. , Lestrade J.-F. , Macías-Pérez J. F. , Mauskopf P. , Monfardini A. , Perotto L. , Pisano G. , Pointecouteau E. , Ponthieu N. , Revéret V. , Ritacco A. , Romero C. , Roussel H. , Ruppin F. , Schuster K. , Shu S. , Sievers A. , Tucker C.
Published: October 2020

High-resolution mapping of the intracluster medium (ICM) up to high redshift and down to low masses is crucial to derive accurate mass estimates of the galaxy cluster and to understand the systematic effects affecting cosmological studies based on galaxy clusters. We present a spatially resolved Sunyaev-Zel’dovich (SZ)/X-ray analysis of ACT-CL J0215.4+0030, a high-redshift (z = 0.865) galaxy cluster of intermediate mass (M500 ≃ 3.5 × 1014 M⊙) observed as part of the ongoing NIKA2 SZ large program, which is a follow-up of a representative sample of objects at 0.5 ≤ z ≤ 0.9. In addition to the faintness and small angular size induced by its mass and redshift, the cluster is contaminated by point sources that significantly affect the SZ signal. This is therefore an interesting case study for the most challenging sources of the NIKA2 cluster sample. We present the NIKA2 observations of this cluster and the resulting data. We identified the point sources that affect the NIKA2 maps of the cluster as submillimeter galaxies with counterparts in catalogs of sources constructed by the SPIRE instrument on board theHerschelobservatory. We reconstructed the ICM pressure profile by performing a joint analysis of the SZ signal and of the point-source component in the NIKA2 150 GHz map. This cluster is a very weak source that lies below the selection limit of thePlanckcatalog. Nonetheless, we obtained high-quality estimates of the ICM thermodynamical properties with NIKA2. We compared the pressure profile extracted from the NIKA2 map to the pressure profile obtained from X-ray data alone by deprojecting the publicXMM-Newtonobservations of the cluster. We combined the NIKA2 pressure profile with the X-ray deprojected density to extract detailed information on the ICM. The radial distribution of its thermodynamic properties (the pressure, temperature and entropy) indicate that the cluster has a highly disturbed core. We also computed the hydrostatic mass of the cluster, which is compatible with estimations from SZ and X-ray scaling relations. We conclude that the NIKA2 SZ large program can deliver quality information on the thermodynamics of the ICM even for one of its faintest clusters after a careful treatment of the contamination by point sources.
USuRPER: Unit-sphere representation periodogram for full spectra
Authors: Binnenfeld A. , Shahaf S. , Zucker S.
Published: October 2020

We introduce an extension of the periodogram concept to time-resolved spectroscopy. USuRPER, the unit-sphere representation periodogram, is a novel technique that opens new horizons in the analysis of astronomical spectra. It can be used to detect a wide range of periodic variability of the spectrum shape. Essentially, the technique is based on representing spectra as unit vectors in a multidimensional hyperspace, hence its name. It is an extension of the phase-distance correlation periodogram we had introduced in previous papers, to very high-dimensional data such as spectra. USuRPER takes the overall shape of the spectrum into account, which means that it does not need to be reduced into a single quantity such as radial velocity or temperature. Through simulations, we demonstrate its performance in various types of spectroscopic variability: single-lined and double-lined spectroscopic binary stars, and pulsating stars. We also show its performance on actual data of a rapidly oscillating Ap star. USuRPER is a new tool to explore large time-resolved spectroscopic databases such as APOGEE, LAMOST, and the RVS spectra of Gaia. We have made a public GitHub repository with a Python implementation of USuRPER available to the community, to experiment with it and apply it to a wide range of spectroscopic time series.