bluuebunny/crossref_metadata_2025 huggingface dataset:
Comprehensive functional enrichment analysis of male infertility
Authors: Razavi Seyed Morteza , Sabbaghian Marjan , Jalili Mahdi , Divsalar Adeleh , Wolkenhauer Olaf , Salehzadeh-Yazdi Ali
Published: November 2017

Spermatogenesis is a multifactorial process that forms differentiated sperm cells in a complex microenvironment. This process involves the genome, epigenome, transcriptome, and proteome to ensure the stability of the spermatogonia and supporting cells. The identification of signaling pathways linked to infertility has been hampered by the inherent complexity and multifactorial aspects of spermatogenesis. Systems biology is a promising approach to unveil underlying signaling pathways and genes and identify putative biomarkers. In this study, we analyzed thirteen microarray libraries of infertile humans and mice, and different classes of male infertility were compared using differentially expressed genes and functional enrichment analysis. We found regulatory processes, immune response, glutathione transferase and muscle tissue development to be among the most common biological processes in up-regulated genes, and genes involved in spermatogenesis were down-regulated in maturation arrest (MArrest) and oligospermia cases. We also observed the overexpression of genes involved in steroid metabolism in post-meiotic and meiotic arrest. Furthermore, we found that the infertile mouse model most similar to human MArrest was the Dazap1 mutant mouse. The results of this study could help elucidate features of infertility etiology and provide the basis for diagnostic markers.
Artificial topography changes the growth strategy of Spartina alterniflora, case study with wave exposure as a comparison
Authors: Hong Hualong , Dai Minyue , Lu Haoliang , Liu Jingchun , Zhang Jie , Chen Chaoqi , Xia Kang , Yan Chongling
Published: November 2017

This paper reports findings about the growth ofSpartina alterniflora(Loisel.) near an engineered coastal protection defences to discover the potential influences on vegetation growth from the artificial topography. Impacts of the artificial topography on the sediment element composition were detected by comparing the fixed effects caused by artificial topography and wave exposure using linear mixed models. Surficial sediments under the impacts of artificial topography contain elevated levels of biogenic elements and heavy metals, including C (and organic carbon), N, S, Al, Fe, Mn, Cu, Zn, As, Cd, Cr, Ni, and Pb. The results showed that element enrichment caused by artificial topography reduced the vegetation sexual reproduction. Contrary to the potential inhibition caused by direct wave exposure, which was due to the biomass accumulation limit, the inhibition caused by artificial topography was related to the transition of growth strategy. The contents of Cu, Mn, N, Ni, S and As in the sediments were critical in considering the relationship between the change in the sediment element composition and the alteration in the plant growth. Our study emphasizes the importance of rethinking the impacts of coastal development projects, especially regarding the heterogeneity of sediment element composition and its ecological consequences.
Bulk double emulsification for flow cytometric analysis of microfluidic droplets
Authors: Sukovich David J. , Kim Samuel C. , Ahmed Noorsher , Abate Adam R.
Published: November 2017

We describe a simple bulk method to prepare double emulsions for high-throughput analysis and sorting with flow cytometers.
A Europium ion post-functionalized indium metal–organic framework hybrid system for fluorescence detection of aromatics
Authors: Wu J. X. , Yan B.
Published: November 2017

A Eu3+-functionalized indium metal–organic framework hybrid system is employed as a fluorescent probe for the discrimination of BTEX in both the liquid and the gas phase.
CaCO3 nanoparticles as the tags for potentiometric detection of a cardiac biomarker using a calcium ion-selective electrode
Authors: Fu Xiaohong , Xu Kun , Feng Xueyu , Chang Bo , Yang Fan , Huang Rong
Published: November 2017

A novel potentiometric immunosensing protocol was developed for the detection of myoglobin on a calcium ion-selective electrode by using bovine serum albumin-functionalized calcium carbonate nanoparticles as the signal-generation tags.
pH-controlled fluorescence changes in a novel semiconducting polymer dot/pyrogallic acid system and a multifunctional sensing strategy for urea, urease, and pesticides
Authors: Huang Hui , Li Jiao , Liu Mengxian , Wang Zizhun , Wang Bingdi , Li Meini , Li Yongxin
Published: November 2017

pH-controlled fluorescence changes in a semiconducting polymer dot/pyrogallic acid system and a multifunctional sensing strategy for urea, urease, and pesticides.
Catalytic CO oxidation over Pd70Au30(111) alloy surfaces: spectroscopic evidence for Pd ensemble dependent activity
Authors: Toyoshima Ryo , Hiramatsu Nana , Yoshida Masaaki , Amemiya Kenta , Mase Kazuhiko , Mun Bongjin Simon , Kondoh Hiroshi
Published: November 2017

We report active Pd ensembles for catalytic CO oxidation over Pd70Au30(111) alloy surfaces by direct in situ spectroscopic observations.
A bimetallic carbide derived from a MOF precursor for increasing electrocatalytic oxygen evolution activity
Authors: Qian Jinjie , Li Ting-Ting , Hu Yue , Huang Shaoming
Published: November 2017

Through different thermal treatments, an obvious phase transformation has been observed in a microporous bimetallic metal–organic framework InOF-16, from binary In2O3 and Co3O4 in oxygen to binary In2O3 and Co3InC0.75 in argon.
Synthesis of Z-alkenes via visible light promoted photocatalytic E → Z isomerization under metal-free conditions
Authors: Cai Wenbin , Fan Huaqiang , Ding Dazhong , Zhang Yongqiang , Wang Wei
Published: November 2017

The synthesis of thermodynamically less stable Z-alkenes via visible light promoted photocatalytic E-to-Z isomerization has been reported.
A combinatorial immunoassay for multiple biomarkersviaa stable isotope tagging strategy
Authors: Sun Gongwei , Huang Biao , Zhang Yi , Zhang Yuqing , Xing Zhi , Zhang Sichun , Zhang Xinrong
Published: November 2017

A combinatorial immunoassay method for biomarker detection based on a stable isotope tagging strategy was proposed.
Highly thermally stable heterogeneous catalysts: study of 0D and 3D porphyrinic MOFs
Authors: Amayuelas E. , Fidalgo-Marijuán A. , Bazán B. , Urtiaga M. K. , Barandika G. , Arriortua M. I.
Published: November 2017

Porphyrin-based MOFs as heterogeneous catalysts show high catalytic activity, recyclability and selectivity towards alkene oxidation.
Characterising the evaporation kinetics of water and semi-volatile organic compounds from viscous multicomponent organic aerosol particles
Authors: Ingram Stephen , Cai Chen , Song Young-Chul , Glowacki David R. , Topping David O. , O’Meara Simon , Reid Jonathan P.
Published: November 2017

Here we present methods to simultaneously investigate diffusivities and volatilities in studies of evolving single aerosol particle size and composition.
Voltage dependent admittance spectroscopy for the detection of near interface defect states for thin film solar cells
Authors: Weiss Thomas Paul , Nishiwaki Shiro , Bissig Benjamin , Buecheler Stephan , Tiwari Ayodhya N.
Published: November 2017

Deep acceptor states at the Cu(In,Ga)Se2/CdS interface were detected by voltage dependent admittance spectroscopy for state of the art low temperature processed chalcopyrite solar cells.
Construction of magnetically separable NiAl LDH/Fe3O4–RGO nanocomposites with enhanced photocatalytic performance under visible light
Authors: Ni Jie , Xue Jinjuan , Xie LinFang , Shen Jing , He Guangyu , Chen Haiqun
Published: November 2017

The characterization and photocatalytic properties of magnetic NiAl LDH/Fe3O4–RGO composites were investigated.
Ethanol synthesis from syngas over Cu(Pd)-doped Fe(100): a systematic theoretical investigation
Authors: Wang Wei , Wang Ye , Wang Gui-Chang
Published: November 2017

The selectivity of ethanol formation are in the order of Fe3Cu6/Fe(100) > Fe3Pd6/Fe(100) > Fe9/Fe(100) > Cu9/Fe(100).
Fundamental peak disappears upon binding of a noble gas: a case of the vibrational spectrum of PtCO in an argon matrix
Authors: Ono Yuriko , Yagi Kiyoshi , Takayanagi Toshiyuki , Taketsugu Tetsuya
Published: November 2017

Anharmonic vibrational state calculations were performed for PtCO and Ar–PtCO via the direct vibrational configuration interaction (VCI) method to get insights into the anomalous effect of a solid argon matrix on the vibrational spectra of PtCO.
A novel strategy to construct Janus metallamacrocycles with both a Ru–arene face and an imidazolium face
Authors: Li Ji , Zhang Peipei , Xu Yan , Su Zhi , Qian Yong , Li Shunli , Yu Tao , Sadler Peter J. , Liu Hong-Ke
Published: November 2017

We report a novel strategy to synthesize Janus metallocyclic Ru–arene complexes with both a Ru–arene face and a didentate imidazolium face, which possess unusual structures and properties.
Electro-synthesis of ammonia from nitrogen at ambient temperature and pressure in ionic liquids
Authors: Zhou Fengling , Azofra Luis Miguel , Ali Muataz , Kar Mega , Simonov Alexandr N. , McDonnell-Worth Ciaran , Sun Chenghua , Zhang Xinyi , MacFarlane Douglas R.
Published: November 2017

High faradaic efficiency reduction of N2 to NH3 is achieved in ionic liquid media under ambient conditions.
Transition-metal-free and organic solvent-free conversion of N-substituted 2-aminobiaryls into corresponding carbazoles via intramolecular oxidative radical cyclization induced by peroxodisulfate
Authors: Natarajan Palani , Priya Priya , Chuskit Deachen
Published: November 2017

An atom-economical and environmentally benign synthesis of N-substituted carbazoles is described. This methodology afforded products in 90–120 minutes.
Synthesis and photophysical study of new fluorescent proton transfer dihydropyrimidinone hybrids as potential candidates for molecular probes
Authors: de Souza Vanessa P. , Vendrusculo Vinicius , Morás Ana M. , Steffens Luiza , Santos Fabiano S. , Moura Dinara J. , Rodembusch Fabiano S. , Russowsky Dennis
Published: November 2017

New photoactive hybrid dihydropyrimidinones were achieved by the Biginelli multicomponent reaction.
Heterogenization of a homogenous catalyst: synthesis and characterization of imidazolium ionene/OH−@SiO2 as an efficient basic catalyst for biodiesel production
Authors: Sammah Neda , Ghiaci Mehran
Published: November 2017

This study provides a new route for heterogenization of a homogeneous catalyst. The catalyst applied for at least 5 cycles.
Development of solidification of floating organic drops liquid–liquid microextraction in a newly designed extraction device
Authors: Torbati Mohammadali , Farajzadeh Mir Ali , Torbati Mostafa , Afshar Mogaddam Mohammad Reza
Published: November 2017

A new approach to continuous homogeneous liquid–liquid microextraction based on the solidification of organic droplets has been developed in a newly designed home-made extraction device.
Stabilization of hybrid perovskite CH3NH3PbI3thin films by graphene passivation
Authors: Tseng Wei-Shiuan , Jao Meng-Huan , Hsu Chen-Chih , Huang Jing-Shun , Wu Chih-I. , Yeh N.-C.
Published: November 2017

Long-term passivation of water-sensitive hybrid perovskites with monolayer graphene.
Surface properties of MoS2 probed by inverse gas chromatography and their impact on electrocatalytic properties
Authors: Otyepková Eva , Lazar Petr , Luxa Jan , Berka Karel , Čépe Klára , Sofer Zdeněk , Pumera Martin , Otyepka Michal
Published: November 2017

Differences in the electrochemistry of MoS2 samples are caused by their surface properties.
Boronic acid recognition of non-interacting carbohydrates for biomedical applications: increasing fluorescence signals of minimally interacting aldoses and sucralose
Authors: Resendez Angel , Halim Md Abdul , Singh Jasmeet , Webb Dominic-Luc , Singaram Bakthan
Published: November 2017

To address carbohydrates that are commonly used in biomedical applications with low binding affinities for boronic acid based detection systems, two chemical modification methods were utilized to increase sensitivity.
Manipulating the stereoselectivity of the thermostable Baeyer–Villiger monooxygenase TmCHMO by directed evolution
Authors: Li Guangyue , Fürst Maximilian J. L. J. , Mansouri Hamid Reza , Ressmann Anna K. , Ilie Adriana , Rudroff Florian , Mihovilovic Marko D. , Fraaije Marco W. , Reetz Manfred T.
Published: November 2017

The thermostable Baeyer–Villiger monooxygenase TmCHMO and evolved mutants are viable catalysts in stereoselective reactions of structurally different ketones.
Steering with light: indexable photomotility in liquid crystalline polymers
Authors: Babaei Mahnoush , Clement J. Arul , Dayal Kaushik , Shankar M. Ravi
Published: November 2017

Harnessing light to achieve manipulation and motility in meso and mm-scale systems offers the ability to remotely trigger actuation without requiring on-board power.
Comparison of the characteristic properties of reduced graphene oxides synthesized from natural graphites with different graphitization degrees
Authors: Jiao Xuan , Qiu Yangshuai , Zhang Lingyan , Zhang Xudong
Published: November 2017

Graphites with a low degree of graphitization are more appropriate to prepare thin layer graphene with a high degree of defects and high specific capacitance.
H2O2-microwave treated graphite stabilized stearic acid as a composite phase change material for thermal energy storage
Authors: Li Chuanchang , Xie Baoshan , Chen Jian , Chen Zhongsheng , Sun Xiaoqin , Gibb Stuart W.
Published: November 2017

Decorating the surface of graphite by hydrogen peroxide-microwave treatment for facile preparation of shape-stabilized PCMs.
Application of an Au/B-ZnO/PET–GR flexible composite structure in photocatalysts and supercapacitor electrodes
Authors: Wang Wei , Ai Taotao , Fan Yuanyuan , Li Wenhu
Published: November 2017

The Au/B-ZnO/PET–GR composite structure with different boron doping concentrations was prepared on a flexible double-layer substrate of PET–GR using the hydrothermal technique assisted by the ion sputtering method.
Using self-efficacy beliefs to understand how students in a general chemistry course approach the exam process
Authors: Willson-Conrad Angela , Grunert Kowalske Megan
Published: November 2017

Retention of students who major in STEM continues to be a major concern for universities. Many students cite poor teaching and disappointing grades as reasons for dropping out of STEM courses. Current college chemistry courses often assess what a student has learned through summative exams. To understand students' experiences of the exam process, including how students prepare for an exam, take an exam, and respond to feedback from an exam, data was collected through interviews with students in an introductory college chemistry course. The interview data was analyzed using emergent coding to describe students' experiences of the exam process using phenomenography. Data indicated that students' experiences with the exam process could be categorized based on their reported exam performance. Overall, differences could be seen between these students' self-efficacy beliefs and metacognitive skills based on the grade each student reported receiving on the exam. The students who performed highest on the exam had self-efficacy beliefs primarily from their mastery experience, and middle performing students' self-efficacy beliefs came from vicarious experience. The lowest performing student had low self-efficacy beliefs. Students who received the highest grades on the exam viewed learning as making meaningful connections between topics, and students who received lower grades viewed learning as memorization. By further understanding students study habits, their views on the exam process, and the development of their self-efficacy beliefs, instructors may be better able to assist low and middle performing students in our general chemistry courses. The findings from this study suggest several ways instructors could facilitate more effective studying and promote higher self-efficacy beliefs, including promoting group work, talking with students about study skills, and encouraging attendance at office hours to review exam responses.
Exemplar Variability Facilitates Retention of Word Learning by Children With Specific Language Impairment
Authors: Aguilar Jessica M. , Plante Elena , Sandoval Michelle
Published: November 2017

Purpose

Variability in the input plays an important role in language learning. The current study examined the role of object variability for new word learning by preschoolers with specific language impairment (SLI).

Method

Eighteen 4- and 5-year-old children with SLI were taught 8 new words in 3 short activities over the course of 3 sessions. Half of the children saw 3 identical objects corresponding to each new word during training (No Variability group); the other half of the children saw 3 different objects corresponding to each new word during training (High Variability group). Children completed vocabulary learning tests for objects seen during training and for new within-category objects that were never seen during training as a test of category generalization. Learning was assessed the day after each training activity, and retention was assessed 3 weeks after the last training session.

Results

There were no group differences on trained or generalization items immediately following training sessions. However, children in the High Variability group demonstrated significantly better retention 3 weeks after experimental training.

Conclusion

These findings demonstrate that object variability facilitates retention of new word learning by children with SLI.

Supplemental Material

https://doi.org/10.23641/asha.5583979
Speech-Language Services for Chinese-Speaking People With Aphasia (C-PWA): Considerations for Assessment and Intervention
Authors: Pak-Hin Kong Anthony
Published: November 2017

Chinese is the world's most widely spoken language with about 1.2 billion speakers. Yet, the majority of the aphasia research to date has been focused on speakers of Indo-European languages. The goals of this paper are threefold: (a) to highlight major research findings that are specific to Chinese speakers with aphasia, (b) to provide a review of the state-of-the-art tools and resources for assessing and managing aphasia in Chinese, and (c) to discuss factors to consider for evaluating and treating Chinese aphasia.
Toward Identifying Mild Cognitive Impairment in Hispanic and African American Adults
Authors: Fleming Valarie B. , Harris Joyce L.
Published: November 2017

Across the breadth of acquired neurogenic communication disorders, mild cognitive impairment (MCI) may go undetected, underreported, and untreated. In addition to stigma and distrust of healthcare systems, other barriers contribute to decreased identification, healthcare access, and service utilization for Hispanic and African American adults with MCI. Speech-language pathologists (SLPs) have significant roles in prevention, education, management, and support of older adults, the population must susceptible to MCI.
Decolonizing Speech-Language Pathology Practice in Acquired Neurogenic Disorders
Authors: Penn Claire , Armstrong Elizabeth , Brewer Karen , Purves Barbara , McAllister Meaghan , Hersh Deborah , Godecke Erin , Ciccone Natalie , Lewis Abigail
Published: November 2017

Indigenous peoples throughout the world, despite being known to suffer from increased risk of stroke and traumatic brain injury (TBI), are marginalised in terms of access to rehabilitation services and have poorer health outcomes than non-indigenous peoples. Speech-language pathology services for indigenous people with aphasia have rarely been discussed in either clinical or research fora in this field, with few guidelines available for clinicians when working with indigenous clients, families, and communities. Exploiting the broad input gathered through the collective problem-solving of a focus group, the paper integrates the input of a group of practitioners and researchers at an international roundtable held in 2016 to generate a “declaration” of issues that need to be addressed regarding aphasia services for indigenous clients with aphasia. The paper aims to promote a transformative approach to service delivery that is driven by decolonizing attitudes and practices, and acknowledges historical, sociopolitical, linguistic, and family contexts as a framework for understanding indigenous clients with aphasia.
Précarité énergétique et fiscalité écologique, retour sur l'expérience avortée du chèque vert français
Authors: Missemer Antoine , Swaton Sophie
Published: November 2017

À la fin des années 2000, un mécanisme de chèque vert a été imaginé en France pour corriger les distorsions résultant de la mise en place d'une taxe carbone. Parmi ces distorsions figurait une aggravation de la précarité énergétique. En partant d'une définition multidimensionnelle de cette précarité, nous montrons que les dispositifs de type chèque vert conçus autour des années 2010 ne permettaient pas de lutter convenablement contre la précarité énergétique. En cause, un mauvais ciblage du dispositif, mais surtout une difficile identification des ménages les plus vulnérables. Ainsi, nous défendons l'idée que le principal problème à traiter est celui de la définition précise de la précarité énergétique, en particulier dans ses dimensions structurelles (logement, transport). Ce travail passe sans doute par une approche circonstanciée et locale, potentiellement peu compatible avec une fiscalité écologique à portée nationale.
Bis[N,N′-(2-indanolyl)]-1,5-diazacyclooctane as Unique Metal Ligand: Self-Assembly of Palladium Nanoparticles and Catalytic Reactivity on C–C Bond Formation
Authors: Tanaka Katsunori , Fujiki Katsumasa
Published: November 2017

A previously unreported 1,5-diazacyclooctane-palladium(II) complex was synthesized using bis[N,N′-(2-indanolyl)]-1,5-diazacyclooctane, which was readily prepared via a novel [4+4] homocyclization of the unsaturated imine intermediate generated from acrolein and 1-amino-2-indanol. Interestingly, the 1,5-diazacyclooctane-palladium(II) complex self-assembled to form palladium nanoparticles. This approach readily provided palladium nanoparticles simply by heating a mixture of palladium(II) acetate and bis[N,N′-(2-indanolyl)]-1,4-diazacyclooctane in dichloroethane at mild temperatures. The 1,5-diazacyclooctane-derivative-palladium nanoparticles were successfully deployed in synthetic applications as a heterogeneous catalyst, facilitating Suzuki coupling and a challenging C–C bond formation via C(sp3)–H activation under low catalyst loading conditions.
Intramolecular Aminotrifluoromethanesulfinyloxylation of ω-Aminoalkenes by CF3SO2Na/Pd(OAc)2/PhI(OAc)2/
t
BuOCl/PivOH System
Authors: Shibata Norio , Suzuki Satoru , Kamo Tomohiro , Fukushi Kazunobu , Tokunaga Etsuko , Sumii Yuji
Published: November 2017

The first example of palladium-catalyzed intramolecular aminotrifluoromethanesulfinyloxylation of unactivated ω-aminoalkenes has been achieved. Reaction conditions are rather unique with a complex consisting of CF3SO2Na/Pd(OAc)2/PhI(OAc)2/
t
BuOCl/PivOH to provide 6-endo-cyclized type products with a piperidine skeleton. Yields are moderate, and SO2 is not extruded. This method also provides the first synthesis of 3-trifluoromethanesulfinyloxy piperidine derivatives.
The Value of Implementing Multidisciplinary Perinatal Care Conference in the Private Practice Setting
Authors: Johnston Robert , Haeri Sina , Hale Richard , Lindsley William , McCormick Annette , Su Eric
Published: November 2017

Objective The objective of this study was to estimate the impact of multidisciplinary (Multi-D) perinatal care conference (PCC) implementation in the private practice setting.

Methods After the initial 12-month period following implementation of the monthly PCC by private maternal–fetal medicine and neonatology practitioners, conference attendees were asked to completed a modified version of the Attitudes Toward Health Care Teams Scale, involving 19 questions assessing their attitudes and opinions toward Multi-D team care on a five-point Likert's scale.

Results Of the 51 average attendees to the PCC, 82.3% completed the survey. A majority of respondents agreed that Multi-D team care resulted in improved care for patients and family, was not overly complex to coordinate, and resulted in significant job satisfaction and improved medical knowledge.

Conclusion Multi-D care is an effective approach to the complicated needs of maternal–fetal medicine patients which may lead to improved patient and family outcomes, high provider satisfaction, and can easily be implemented and utilized within a private practice or community hospital setting.
Nasenmuscheloperation: Welche olfaktorischen Leistungen werden eingeschränkt
Authors: Laudien Martin
Published: November 2017

Konstantinidis I et al. Intranasal trigeminal function in patients with empty nose syndrome. Laryngoscope 2017;127: 1263–1267

Das trigeminale System vermittelt die Wahrnehmung des nasalen Luftflusses. Eine griechische Arbeitsgruppe hat nun in einer Studie untersucht,
inwieweit bei „Syndrom der leeren Nase“-Patienten (Empty Nose Syndrome, ENS) die geschädigte intranasale Trigeminusfunktion Teil einer
paradoxen Nasenatmungsbehinderung ist.
Bioresorbierbare Scaffolds – Therapiekonzept mit Zukunft?
Authors: Rottländer Dennis , Degen Hubertus , Haude Michael
Published: November 2017

Drug eluting Stents (DES) sind aufgrund ihrer hohen Effektivität und Sicherheit die Standardtherapie im Rahmen der perkutanen Koronarintervention. Bioresorbierbare Scaffolds (BRS) bestehen aus einem resorbierbaren Grundgerüst und einer antiproliferativen Beschichtung. Sie wurden mit dem Ziel der Wiederherstellung der Gefäßintegrität und Vasomotion konzipiert. Die aktuellen Daten zum Absorb-BRS weisen jedoch auf vermehrte Sicherheits- (Thrombosen) und Effizienzlimitationen (Revaskularisationen) im Vergleich zu DES hin. Ein routinemäßiger Einsatz von BRS im Rahmen der PCI kann aktuell nicht empfohlen werden. Eine individuelle Indikationsstellung unter Abwägung der potenziellen Vorteile und Risiken sollte vor Implantation eines BRS erfolgen. Eine Weiterentwicklung der Technologie mit dünneren Streben und besseren mechanischen Eigenschaften könnten diese Limitationen allerdings überwinden und den Stellenwert der BRS neu definieren.
Feasibility, safety, and diagnostic yield of the Extra Wide Angle View (EWAVE) colonoscope for the detection of colorectal lesions
Authors: Bronzwaer Maxime , Dekker Evelien , Weingart Vincens , Groth Stefan , Pioche Mathieu , Rivory Jérôme , Beyna Torsten , Neuhaus Horst , Ponchon Thierry , Allescher Hans , Fockens Paul , Rösch Thomas
Published: November 2017

Background and study aims The adenoma detection rate (ADR) of conventional colonoscopy can still be improved. We conducted a prospective multicenter cohort study to assess the feasibility, safety, and diagnostic yield of the Extra Wide Angle View (EWAVE) colonoscope, which offers a 235° view obtained from a forward-viewing and two lateral backward-viewing lenses incorporated into one image.

Patients and methods The study was performed between November 2015 and June 2016. EWAVE colonoscopy was performed in patients with an increased risk of colorectal cancer by experienced and EWAVE-trained endoscopists (≥ 500 colonoscopies, ≥ 10 with the EWAVE system).

Results A total of 193 patients underwent EWAVE colonoscopy. The cecal intubation rate was 97.4 %. EWAVE colonoscopy had a polyp detection rate (PDR) of 61.1 % (118 /193), ADR of 39.9 % (77 /193), and advanced ADR of 13.5 % (26 /193). No adverse events occurred.

Conclusions EWAVE colonoscopy is feasible and safe. The ADR appears comparable to those achieved with conventional colonoscopes in similar patient populations. To further elucidate the additional benefits of wide-angle-view colonoscopes, randomized trials would be required. Clinical trials registration number: NTR4536 (www.trialregister.nl)
The Gothic bet: Riccardo Freda’s I vampiri (1957) and the birth of Italian horror cinema from an industrial perspective
Authors: Guarneri Michael
Published: November 2017

Scholars tend to agree on Riccardo Freda’s I vampiri (1957) being the first Italian horror film. Indeed, prior to Freda’s Paris-set Gothic potboiler, which mixes the Erzsébet Báthory legend with the Frankenstein myth, no horror movie proper seems to have been made in Italy. Drawing from a series of interviews given by the director over the years, the existing literature about Italian horror cinema conceives of I vampiri as a film appearing out of the blue, born on the fly because of an alleged bet and shot at breakneck speed in a couple of weeks. Freda’s use of the word “bet” in these interviews, and the film’s meagre returns at the domestic box-office, have led academics to see I vampiri as an epically brave, if commercially unsuccessful, challenge to the dominant taste—an experiment carried out by inventive yet unlucky pioneers, skilled artisans too ahead of their time. Resultantly, a great deal has been written about “the supposedly non-industrial quality” of Italian horror movies, “which apparently relied only on the craftsmanship of talented directors” (Di Chiara, 2016, p 30), such as Freda, Mario Bava and Antonio Margheriti. By revisiting Freda’s often-quoted anecdotes about the extemporaneous genesis of I vampiri in the light of the film’s production and distribution data preserved at the Archivio Centrale dello Stato in Rome, the present article seeks to shift the focus of discussion from the ‘Great Men’ to the broader economic, political and cultural context in which I vampiri was manufactured. The article reveals that it was the very nature of the post-war Italian film industry as regulated by the Christian-Democrat laws of 1949 that allowed Freda and his producers Ermanno Donati, Luigi Carpentieri and Goffredo Lombardo to place their bet on an unprecedented ‘Gothic made in Italy’. By adopting this materialistic approach, Freda’s experiment in terror ultimately emerges as a minor, low-risk speculation, and a market test confirming a long-standing Italian bias against home-grown horror narratives, to the point that it is more appropriate to consider Terence Fisher’s Dracula (1958) as the ‘originary film’ of Italian horror cinema.
Water based fluidic radio frequency metamaterials
Authors: Cai Xiaobing , Zhao Shaolin , Hu Mingjun , Xiao Junfeng , Zhang Naibo , Yang Jun
Published: November 2017

Electromagnetic metamaterials offer great flexibility for wave manipulation and enable exceptional functionality design, ranging from negative refraction, anomalous reflection, super-resolution imaging, transformation optics to cloaking, etc. However, demonstration of metamaterials with unprecedented functionalities is still challenging and costly due to the structural complexity or special material properties. Here, we demonstrate for the first time the versatile fluidic radio frequency metamaterials with negative refraction using a water-embedded and metal-coated 3D architecture. Effective medium analysis confirms that metallic frames create an evanescent environment while simultaneously water cylinders produce negative permeability under Mie resonance. The water-metal coupled 3D architectures and the accessory devices for measurement are fabricated by 3D printing with post electroless deposition. Our study also reveals the great potential of fluidic metamaterials and versatility of the 3D printing process in rapid prototyping of customized metamaterials.
Development and application of a 2-electron reduced density matrix approach to electron transport via molecular junctions
Authors: Hoy Erik P. , Mazziotti David A. , Seideman Tamar
Published: November 2017

Can an electronic device be constructed using only a single molecule? Since this question was first asked by Aviram and Ratner in the 1970s [Chem. Phys. Lett. 29, 277 (1974)], the field of molecular electronics has exploded with significant experimental advancements in the understanding of the charge transport properties of single molecule devices. Efforts to explain the results of these experiments and identify promising new candidate molecules for molecular devices have led to the development of numerous new theoretical methods including the current standard theoretical approach for studying single molecule charge transport, i.e., the non-equilibrium Green’s function formalism (NEGF). By pairing this formalism with density functional theory (DFT), a wide variety of transport problems in molecular junctions have been successfully treated. For some systems though, the conductance and current-voltage curves predicted by common DFT functionals can be several orders of magnitude above experimental results. In addition, since density functional theory relies on approximations to the exact exchange-correlation functional, the predicted transport properties can show significant variation depending on the functional chosen. As a first step to addressing this issue, the authors have replaced density functional theory in the NEGF formalism with a 2-electron reduced density matrix (2-RDM) method, creating a new approach known as the NEGF-RDM method. 2-RDM methods provide a more accurate description of electron correlation compared to density functional theory, and they have lower computational scaling compared to wavefunction based methods of similar accuracy. Additionally, 2-RDM methods are capable of capturing static electron correlation which is untreatable by existing NEGF-DFT methods. When studying dithiol alkane chains and dithiol benzene in model junctions, the authors found that the NEGF-RDM predicts conductances and currents that are 1-2 orders of magnitude below those of B3LYP and M06 DFT functionals. This suggests that the NEGF-RDM method could be a viable alternative to NEGF-DFT for molecular junction calculations.
Investigating magnetic proximity effects at ferrite/Pt interfaces
Authors: Collet M. , Mattana R. , Moussy J.-B. , Ollefs K. , Collin S. , Deranlot C. , Anane A. , Cros V. , Petroff F. , Wilhelm F. , Rogalev A.
Published: November 2017

Spintronic devices based on pure spin currents have drawn a lot of attention during the last few years for low energy device design. One approach to generate pure spin currents is to combine a metallic or insulating ferromagnetic layer with a non-magnetic metallic layer with a large spin-orbit coupling. A recent controversy has arisen in the possible role of magnetic proximity effects at ferromagnetic/non-magnetic interfaces, which can hamper the understanding of pure spin current generation mechanisms. While magnetic proximity effects have been frequently observed at ferromagnetic metal/non-magnetic interfaces, there are only a few studies on ferromagnetic insulator/non-magnetic interfaces. Regarding the use of ferromagnetic insulators, the focus has been mainly on yttrium iron garnet (YIG). However, investigation of induced magnetic moments at YIG/Pt interfaces has engendered contradictory results. Here, we propose to study insulating ferrites for which electronic and magnetic properties can be modulated. Magnetic proximity effects have been investigated at MnFe2O4/Pt, CoFe2O4/Pt, and NiFe2O4/Pt interfaces by X-ray circular magnetic dichroism (XMCD) measurements at the Pt L3 edge. Although hybridization with Pt seems to be different among the ferrites, we do not detect any XMCD signal as the signature of an induced magnetism in Pt. We have then studied the Fe3O4 ferrite below and above the Verwey transition temperature. No XMCD signal has been measured in the insulating or conducting phase of Fe3O4. This suggests that the absence of magnetic proximity effects at ferrite/Pt interfaces is not linked to the insulating character or not of the ferrites.
Modulational instability of electrostatic waves in a magnetized dusty plasma with kappa distributed electrons
Authors: Akhtar Naseem , Mahmood Shahzad , Jehan Nusrat , Mirza Arshad M.
Published: November 2017

The modulational instability of dust-ion acoustic wave (DIAW) and dust-ion cyclotron wave (DICW) is investigated in a magnetized plasma containing static dust particles. The static dust particles can be positively or negatively charged, while ions are taken to be dynamic and inertialess electrons follow the kappa distribution in a magnetized dusty plasma. The nonlinear Schrödinger equation is derived to study the amplitude modulation of obliquely propagating electrostatic waves in a magnetized dusty plasma using the Krylov-Bogoliubov-Mitropolsky method. The dispersive and nonlinear coefficients, i.e., P and Q of nonlinear Schrödinger equation, are obtained which depend on the dust charge concentration, the magnetic field intensity, dust charge polarity, angle of wave propagation, and spectral index kappa for the nonthermal electrons. The modulationally stable and unstable regions of DIAW and DICW are investigated numerically, and the illustration of contour plots of product PQ with wave propagation angle θ and critical wave number kc is also presented. It is found that DIAW and DICW become modulationally unstable at low values of wave number k for negatively charged dust particles in comparison with positively charged dust particles or without dust particles case in a magnetized plasma. The stable region for DIAW, whose wave frequency now depends also on wave propagation angle in a magnetized plasma, is found to be increased in comparison with the unmagnetized plasma case. The observations and existence of positively and negatively charged dust particles in different regions of space plasmas and in laboratory experiments are also pointed out.
Probing cluster surface morphology by cryo kinetics of N2 on cationic nickel clusters
Authors: Mohrbach Jennifer , Dillinger Sebastian , Niedner-Schatteburg Gereon
Published: November 2017

We present the stepwise N2 adsorption kinetics of size selected Nin+ (n = 5-20) clusters at 26 K as obtained by a hybrid tandem ion trap instrument. Pseudo-first-order kinetic fits confirm consecutive adsorption steps without evidence of cluster isomers and up to adsorption limits, which scale with the cluster size. The reaction rates for the initial N2 adsorption increase smoothly with the cluster size and similar to hard sphere cluster modeling. The isothermal kinetics allow for the tentative elucidation of cluster surface morphologies and for their classification into highly symmetrical clusters with all smooth surfaces, small clusters with rough surfaces, and large clusters with partially rough and smooth surface areas. The parallel characterization of the vibrational spectroscopy of some cluster adsorbate complexes supports and refines the achieved conclusions and is published back to back with this contribution [S. Dillinger, J. Mohrbach, and G. Niedner-Schatteburg, J. Chem. Phys. 147, 184305 (2017)]. These two studies elucidate the adsorbate to cluster interaction, and they confirm and specify the sometimes considerable structural fluxionality of finite and curved metal surfaces in high detail. This work precedes further studies along the present lines of thought.
Probing cluster surface morphology by cryo spectroscopy of N2 on cationic nickel clusters
Authors: Dillinger Sebastian , Mohrbach Jennifer , Niedner-Schatteburg Gereon
Published: November 2017

We present the cryogenic (26 K) IR spectra of selected [Nin(N2)m]+ (n = 5–20, m = 1 − mmax), which strongly reveal n- and m-dependent features in the N2 stretching region, in conjunction with density functional theory modeling of some of these findings. The observed spectral features allow us to refine the kinetic classification [cf. J. Mohrbach, S. Dillinger, and G. Niedner-Schatteburg, J. Chem. Phys. 147, 184304 (2017)] and to define four classes of structure related surface adsorption behavior: Class (1) of Ni6+, Ni13+, and Ni19+ are highly symmetrical clusters with all smooth surfaces of equally coordinated Ni atoms that entertain stepwise N2 adsorption up to stoichiometric N2:Nisurface saturation. Class (2) of Ni12+ and Ni18+ are highly symmetrical clusters minus one. Their relaxed smooth surfaces reorganize by enhanced N2 uptake toward some low coordinated Ni surface atoms with double N2 occupation. Class (3) of Ni5+ and Ni7+ through Ni11+ are small clusters of rough surfaces with low coordinated Ni surface atoms, and some reveal semi-internal Ni atoms of high next-neighbor coordination. Surface reorganization upon N2 uptake turns rough into rough surface by Ni atom migration and turns octahedral based structures into pentagonal bipyramidal structures. Class (4) of Ni14+ through Ni17+ and Ni20+ are large clusters with rough and smooth surface areas. They possess smooth icosahedral surfaces with some proximate capping atom(s) on one hemisphere of the icosahedron with the other one largely unaffected.
Homogeneous-oxide stack in IGZO thin-film transistors for multi-level-cell NAND memory application
Authors: Ji Hao , Wei Yehui , Zhang Xinlei , Jiang Ran
Published: November 2017

A nonvolatile charge-trap-flash memory that is based on amorphous indium-gallium-zinc-oxide thin film transistors was fabricated with a homogeneous-oxide structure for a multi-level-cell application. All oxide layers, i.e., tunneling layer, charge trapping layer, and blocking layer, were fabricated with Al2O3 films. The fabrication condition (including temperature and deposition method) of the charge trapping layer was different from those of the other oxide layers. This device demonstrated a considerable large memory window of 4 V between the states fully erased and programmed with the operation voltage less than 14 V. This kind of device shows a good prospect for multi-level-cell memory applications.
Superluminal and negative delay times in isotropic-anisotropic one-dimensional photonic crystal
Authors: Ouchani N. , El Moussaouy A. , Aynaou H. , El Hassouani Y. , El Boudouti E. H. , Djafari-Rouhani B.
Published: November 2017

In this work, we investigate the possibility of superluminal and negative delay times for electromagnetic wave propagation in a linear and passive periodic structure consisting of alternating isotropic and anisotropic media. This phenomenon is due to the birefringence of the anisotropic layers of the structure. By adjusting the orientations of these layers, the delay times of transmitted waves can be controlled from subluminality to superluminality and vice versa. Numerical results indicate that the apparent superluminal propagation of light occurs inside the photonic band-gaps when the principal axes of the anisotropic layers are parallel or perpendicular to the fixed axes. For other orientations of these layers, tunneling and superluminal regimes appear inside the photonic bandgaps and in the allowed bands for frequencies close to the transmission minima. The effect of the number of unit cells of the photonic crystal structure on the propagation of light with superluminal and negative delay times is also investigated. We show that the structure exhibits the Hartman effect in which the tunneling delay time of the electromagnetic wave through the photonic band-gap of the structure converges asymptotically to a finite value with increasing the number of layers. The Green's function approach has been used to derive the transmission and reflection coefficients, the density of states, and the delay times of electromagnetic waves propagating through the structure. The control of the magnitude and the sign of the delay time of light propagation represent a key point in slow and fast light technologies. The proposed structure in this study represents a new system for controlling the delay times of wave propagation without a need of active or non-linear media as well as lossy or asymmetric periodic structures.
Spectrally resolved surface plasmon resonance dispersion using half-ball optics
Authors: Dehmel Raphael , Baumberg Jeremy J. , Steiner Ullrich , Wilts Bodo D.
Published: November 2017

In this work, a variant of a Kretschmann-type surface plasmon resonance (SPR) sensor is introduced. k-space imaging is combined with half-ball glass optics to facilitate the measurement of SPRs across the visible spectral range. In contrast to current state-of-the-art techniques, which are widely utilized in commercially available systems, the presented method allows single-shot-acquisition of the full angular reflection without any moving parts, as well as mapping of the surface plasmon dispersion by scanning across the entire visible wavelength range. Measurements on various thin metallic films demonstrate the sensitivity of the system towards minute changes of the metal surface and its close vicinity. The fast and precise measurement of surface plasmon resonances paves the way for improved detection in applications such as immunoassays or gas-sensors, especially for real-time in situ measurements.
Anomalous Nernst effect in a microfabricated thermoelectric element made of chiral antiferromagnet Mn3Sn
Authors: Narita Hideki , Ikhlas Muhammad , Kimata Motoi , Nugroho Agustinus Agung , Nakatsuji Satoru , Otani YoshiChika
Published: November 2017

Toward realizing a thermopile made of the chiral anti-ferromagnet Mn3Sn, focused ion beam (FIB) lithography was employed to microfabricate a thermoelectric element consisting of a Ta/Al2O3/Mn3Sn layered structure. In this device, the Ta layer acts as a heater producing Joule heat diffusing across the Al2O3 insulating layer into the thin Mn3Sn layer. The measured Nernst signal exhibits a clear hysteresis in an applied temperature gradient and magnetic field at 300 K, and its magnitude is proportional to the square of the electrical current applied to the Ta heater. The spontaneous, zero field voltage signal in the device is of the order of a few μV, which is almost the same order of magnitude as observed in the bulk single-crystal Mn3Sn under a temperature gradient. The anomalous Nernst coefficient SANE of the microfabricated element was determined using a temperature gradient simulated by finite-element modeling. The obtained value of SANE is 0.27 μV/K, which is in good agreement with that of the reported experimental value of SANE (0.3 μV/K) for bulk single-crystal Mn3Sn. This result indicates that FIB microfabrication does not significantly alter the thermoelectric properties of bulk Mn3Sn. As the chiral antiferromagnet produces almost no stray field, our study opens the avenue for the fabrication of an efficient thermopile by densely packing the microfabricated antiferromagnetic elements.
Effects of pressure on suspended micromechanical membrane arrays
Authors: Naesby Andreas , Naserbakht Sepideh , Dantan Aurélien
Published: November 2017

The effects of pressure on micromechanical air-filled cavities made by a pair of suspended, parallel silicon nitride membranes are investigated in the free molecular and quasi-molecular regimes. Variations of the fundamental drummode mechanical resonant frequencies and damping with air pressure are determined by means of optical interferometry. A kinetic damping linear friction force and a positive resonant frequency shift due to the compression of the fluid between the membranes are observed to be proportional to pressure in the range of 0.01–10 mbars. For resonators with near-degenerate modes, hybridization of the modes due to this squeeze film effect is also observed and well accounted for by a simple spring-coupled oscillator model.