Digital Commons Network^™

The Impact Of Firm Characteristics On Speed Of Adjustment To Target Leverage: A Uk Study, James Fitzgerald, J. Ryan

Articles

Responding to the need to investigate heterogeneity in the speed of adjustment (SOA) to target leverage in a manner that reflects the fractional nature of leverage, we estimate SOA across sub-samples of UK firms using the Dynamic Panel Fractional (DPF) estimator. Using firm characteristics to identify firms subject to varying costs of deviation from and adjustment to target leverage, we find significant evidence of heterogeneity in the speeds at which UK firms adjust to target leverage. Our results show that small, high growth and low dividend paying firms adjust to target leverage faster than their large, low growth and high …

Cooking A Corporation Tax Controversy: Apple, Ireland And The Eu., Ciara Graham, Brendan O'Rourke

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Given the centrality of corporations in distribution of income and wealth studies, discursive constructions of corporate taxation are essential to understanding the production of inequality. The focus of this study is an interview with Apple’s Chief Executive Tim Cook on the Irish state broadcaster, Raidió Teilifís Éireann’s (RTÉ) flagship news programme, Morning Ireland, following the ruling by the European Commission (EC) on the corporation tax arrangements between Apple Inc. and Ireland. Drawing on a Critical Discourse Analysis (CDA) approach, a frame analysis is provided. The significance and extent of the EC’s ruling has potential implications for corporation taxation policy, within …

Degradation Kinetics Of Cold Plasma-Treated Antibiotics And Their Antimicrobial Activity, Chaitanya Sarangapani, Dana Ziuzina, Patrice Behan, Daniela Boehm, Brendan F. Gilmore, Patrick J. Cullen, Paula Bourke

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Antibiotics, such as ofloxacin (OFX) and ciprofloxacin (CFX), are often detected in considerable concentrations in both wastewater effluents and surface water. This poses a risk to non-target organisms and to human health. The aim of this work was to study atmospheric cold plasma (ACP) degradation of antibiotics in water and meat effluent and to explore any residual antimicrobial activity of samples submitted to the plasma process. The results revealed that ACP successfully degraded the studied antibiotics and that the reaction mechanism is principally related to attack by hydroxyl radicals and ozone. According to the disk diffusion assay, the activity of …

Cost-Efficient And Easy To Perform Pcr-Based Assay To Identify Met Exon 14 Skipping In Formalin-Fixed Paraffin-Embedded (Ffpe) Non-Small Cell Lung Cancer (Nsclc) Samples, Odharnaith O'Brien, Mark C. Wright, Cathal O'Brien, Orla Geoghegan, Niamh Leonard, Siobhan Nicolson, Sinead Cuffe, Aurelie Fabre, Wolfram Jochum, Markus Joerger, Steven G. Gray, Stephen P. Finn

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MET is a receptor tyrosine kinase (RTK) that plays important roles in carcinogenesis. Despite being frequently overexpressed in cancer, clinical responses to targeting this receptor have been limited. Recently novel splicing mutations involving the loss of exon 14 (called METex14 skipping) have emerged as potential biomarkers to predict for responsiveness to targeted therapies with Met inhibitors in non-small cell lung cancer (NSCLC). Currently, the diverse genomic alterations responsible for METex14 skipping pose a challenge for routine clinical diagnostic testing. In this report, we examine three different methodologies to detect METex14 and assess their potential utility for use as a diagnostic …

Ultrasound/Elastography Techniques, Lipidomic And Blood Markers Compared To Magnetic Resonance Imaging In Non-Alcoholic Fatty Liver Disease Adults, Irene Cantero, Mariana Elorz, Itziar Abete, Bertha Araceli Marin, Jose Ignacio Herrero, Jose Ignacio Monreal, Alberto Benito, Jorge Quiroga, Ana Martínez, Pilar Huarte, Juan Isidro Uriz-Otano, Josep Antoni Tur, John Kearney, J. Alfredo Martinez, M. Angeles Zulet

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Introduction: Non-alcoholic fatty liver disease (NAFLD) may progress to steatohepatitis, cirrhosis and complicated hepatocellular carcinoma with defined differential symptoms and manifestations. Objective: To evaluate the fatty liver status by several validated approaches and to compare imaging techniques, lipidomic and routine blood markers with magnetic resonance imaging in adults subjects with non-alcoholic fatty liver disease. Materials and methods: A total of 127 overweight/obese with NAFLD, were parallelly assessed by Magnetic Resonance Imaging (MRI), ultrasonography, transient elastography and a validated metabolomic designed test to diagnose NAFLD in this cross-sectional study. Body composition (DXA), hepatic related biochemical measurements as well as the Fatty …

Effect Of Neoadjuvant Chemoradiation On Preoperative Pulmonary Physiology, Postoperative Respiratory Complications And Quality Of Life In Patients With Oesophageal Cancer, J. A. Elliott, L. O'Byrne, G. Foley, C. F. Murphy, Suzanne Doyle, S. King, E. M. Guinan, N. Ravi, V. Reynolds

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Background: It remains controversial whether neoadjuvant chemoradiation (nCRT) for oesophageal cancer influences operative morbidity, in particular pulmonary, and quality of life. This study combined clinical outcome data with systematic evaluation of pulmonary physiology to determine the impact of nCRT on pulmonary physiology and clinical outcomes in locally advanced oesophageal cancer.

Methods: Consecutive patients treated between 2010 and 2016 were included. Three-dimensional conformal radiation was standard, with a lung dose–volume histogram of V20 less than 25 per cent, and total radiation between 40 and 41⋅4Gy. Forced expiratory volume in 1 s (FEV1), forced vital capacity (FVC) and diffusion capacity …

A Web-Based Dietary Intervention In Early Pregnancy And Neonatal Outcomes: A Randomized Controlled Trial, Rachel Ak Kennedy, C.M.E. Reynolds, Shona Cawley, E. O'Malley, D.M. Mccartney, M.J. Turner

Articles

Background Maternal nutrition is a determinant of pregnancy outcomes. Few studies have evaluated the potential of online nutrition resources to modify behaviour. This randomized controlled trial aimed to determine whether access to a customized evidence-based nutrition website in pregnancy improved neonatal outcomes.

Methods Women < 18 weeks gestation were recruited at their convenience. The control group received standard care. In addition to standard care, the intervention group received access to an evidence-based nutrition website, customized to the preferences of pregnant women.

Results Of the 250 women, there were no differences in characteristics between the two groups. Of the women, 91.0% reported they make a conscious effort currently to eat a healthy diet. However, only 19.6% met dietary requirements for calcium, 13.2% for iron, 2.7% for folate and 2.3% for iodine. The most popular website section was pregnancy …

The Effect Of Atmospheric Cold Plasma On Bacterial Stress Responses And Virulence Using Listeria Monocytogenes Knockout Mutants, Apurva Patange, Conor O'Byrne, Daniela Boehm, Patrick J. Cullen, Kevin Keener, Paula Bourke

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Listeria monocytogenes is an opportunistic intracellular pathogen commonly associated with serious 16 infections and multiple food-borne outbreaks. In this study, we investigated the influence of 17 atmospheric cold plasma (80 kV, 50 Hz) on L. monocytogenes (EGD-e) and its knockout mutants of 18 sigB, rsbR, prfA, gadD and lmo0799 genes at different treatment time intervals. Further, to ascertain if 19 sub-lethal environmental stress conditions could influence L. monocytogenes survival and growth 20 responses, atmospheric cold plasma (ACP) resistance was evaluated for the cultures exposed to cold 21 (4°C) or acid (pH 4) stress for 1 h. The results demonstrate that …

Disarming Pseudomonas Aeruginosa Virulence By The Inhibitory Action Of 1,10-Phenanthroline-5,6-Dione- Based Compounds: Elastase B (Lasb) As A Chemotherapeutic Target, Anna Clara M. Galdino, Livia Vigano, Aleaxandre A. De Castron, Elaine F.F; Da Cunha, Thais P. Mello, Larissa M. Mattos, Marcos D. Pereira, Mary Hunt, Megan O'Shaughnessy, Orla L. Howe, Michael Devereux, Malachy Mccann, Teodorico C. Ramalho, Marta H. Branquinha, André L.S. Santos

Articles

negative pathogen Pseudomonas aeruginosa, and this enzyme orchestrates several physiopathological events during bacteria-host interplays. LasB is considered to be a potential target for the development of an innovative chemotherapeutic approach, especially against multidrug-resistant strains. Recently, our group showed that 1,10-phenanthroline-5,6-dione (phendione), [Ag(phendione)2]ClO4 (Ag-phendione) and [Cu(phendione)3](ClO4)2.4H2O (Cu-phendione) had anti-P. aeruginosa action against both planktonic- and biofilm-growing cells. In the present work, we have evaluated the effects of these compounds on the (i) interaction with the lasB active site using in silico approaches, (ii) lasB proteolytic activity by using a specific fluorogenic peptide substrate, (iii) lasB gene expression by real time-polymerase chain …

The Abundance Of Akkermansia Muciniphila And Its Relationship With Sulphated Colonic Mucins In Health And Ulcerative Colitis, Helen Earley, Grainne Earley, Aine Balfe, J. Calvin Coffey, Desmond C. Winter, Ronan O'Connell

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Akkermansia muciniphila utilises colonic mucin as its substrate. Abundance is reduced in ulcerative colitis (UC), as is the relative proportion of sulphated mucin in the mucus gel layer (MGL). It is unknown if these phenomena are related, however reduced sulphated mucins could contribute to reduced abundance, owing to a lack of substrate. The aim of this study was to quantify A. muciniphila within the MGL and to relate these findings with markers of inflammation and the relative proportion of sulphomucin present. Colonic biopsies and mucus brushings were obtained from 20 patients with active UC (AC), 14 with quiescent UC (QUC) …

Dough Properties And Baking Characteristics Of White Bread, As Affected By Addition Of Raw, Germinated And Toasted Pea Flour, Kim A. Millar, Catherine Barry-Ryan, Roisin Burke, Sinead Mccarthy, Eimear Gallagher

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Thermal and non-thermal processing may alter the structure and improve the techno-functional properties of pulses and pulse flours, increasing their range of applications in protein-enhanced foods. The effects of germination and toasting of yellow peas (Pisum sativum) on flour and dough characteristics were investigated. Wheat flour was substituted with raw, germinated and toasted pea flour (30%). The resulting bread-baking properties were assessed. Toasting increased dough water absorption and improved dough stability compared with germinated and raw pea flour (p < 0.05). This resulted in bread loaves with comparable specific volume and loaf density to that of a wheat flour control. Significant correlations between dough rheological properties and loaf characteristics were observed. Addition of pea flours increased the protein content of the breads from 8.4% in the control white bread, to 10.1–10.8% (p < 0.001). Toasting demonstrated the potential to improve the techno-functional properties of pea flour. Results highlight the potential application of pea flour in bread-making to increase the protein content.

The Most Revealing Word In The United States Reports, Richard Primus

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The most prominent issue in NFIB v. Sebelius was whether Congress’s regulatory power under the Commerce Clause stops at a point marked by a distinction between “activity” and “inactivity.” According to the law’s challengers, prior decisions about the scope of the commerce power already reflected the importance of the distinction between action and inaction. In all of the previous cases in which exercises of the commerce power had been sustained, the challengers argued, that power had been used to regulate activity. Never had Congress tried to regulate mere inactivity. In NFIB, four Justices rejected that contention, writing that such …

An American Approach To Social Democracy: The Forgotten Promise Of The Fair Labor Standards Act, Kate Andrias

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There is a growing consensus among scholars and public policy experts that fundamental labor law reform is necessary in order to reduce the nation’s growing wealth gap. According to conventional wisdom, however, a social democratic approach to labor relations is uniquely un-American—in deep conflict with our traditions and our governing legal regime. This Article calls into question that conventional account. It details a largely forgotten moment in American history: when the early Fair Labor Standards Act (FLSA) established industry committees of unions, business associations, and the public to set wages on an industry-by-industry basis. Alongside the National Labor Relations Act, …

Class Actions, Indivisibility, And Rule 23(B)(2), Maureen Carroll

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The federal class-action rule contains a provision, Rule 23(b)(2), that authorizes class-wide injunctive or declaratory relief for class-wide wrongs. The procedural needs of civil rights litigation motivated the adoption of the provision in 1966, and in the intervening years, it has played an important role in managing efforts to bring about systemic change. At the same time, courts have sometimes struggled to articulate what plaintiffs must show in order to invoke Rule 23(b)(2). A few years ago, the Supreme Court weighed in, stating that the key to this type of class action is the “indivisible” nature of the remedy the …

Targeting Poverty In The Courts: Improving The Measurement Of Ability To Pay Fines, Meghan M. O'Neil, J.J. Prescott

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Ability-to-pay determinations are essential when governments use money-based alternative sanctions, like fines, to enforce laws. One longstanding difficulty in the U.S. has been the extreme lack of guidance on how courts are to determine a litigant’s ability to pay. The result has been a seat-of-the-pants approach that is inefficient and inaccurate, and, as a consequence, very socially costly. Fortunately, online platform technology presents a promising avenue for reform. In particular, platform technology offers the potential to increase litigant access, reduce costs, and ensure consistent and fair treatment—all of which should lead to more accurate sanctions. We use interviews, surveys, and …

Risk Factors Associated With Myopia In Schoolchildren In Ireland, Síofra Harrington, Jim Stack, Veronica O'Dwyer

Articles

Aim To examine the demographic and social factors associated with myopia in schoolchildren in Ireland.

Methods Thirty-seven schools participated, representing a mix of urban and rural schools and schools in socioeconomically disadvantaged and non-disadvantaged areas in Ireland. Examination included cyclopleged autorefraction (1% cyclopentolate hydrochloride). Height and weight of participants were measured. Parents filled in a participant’s lifestyle questionnaire, including questions on daily screen time use and daylight exposure. Myopia was defined as spherical equivalent ≤−0.50 D.

Results Data from 1626 participants (881 boys, 745 girls) in two age groups, 6–7 years (728) and 12–13 years (898), were examined. Myopia prevalence …

A U-Net Deep Learning Framework For High Performance Vessel Segmentation In Patients With Cerebrovascular Disease, Michelle Livne, Jana Rieger, Orhun Utku Aydin, Abdel Aziz Taha, Ela Marie Akay, Tabea Kossen, Jan Sobesky, John D. Kelleher, Kristian Hildebrand, Dietmar Frey, Vince I. Madai

Articles

Brain vessel status is a promising biomarker for better prevention and treatment in cerebrovascular disease. However, classic rule-based vessel segmentation algorithms need to be hand-crafted and are insufficiently validated. A specialized deep learning method—the U-net—is a promising alternative. Using labeled data from 66 patients with cerebrovascular disease, the U-net framework was optimized and evaluated with three metrics: Dice coefficient, 95% Hausdorff distance (95HD) and average Hausdorff distance (AVD). The model performance was compared with the traditional segmentation method of graph-cuts. Training and reconstruction was performed using 2D patches. A full and a reduced architecture with less parameters were trained. We …

Capturing And Measuring Thematic Relatedness, Magdalena Kacmajor, John D. Kelleher

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In this paper we explain the difference between two aspects of semantic relatedness: taxonomic and thematic relations. We notice the lack of evaluation tools for measuring thematic relatedness, identify two datasets that can be recommended as thematic benchmarks, and verify them experimentally. In further experiments, we use these datasets to perform a comprehensive analysis of the performance of an extensive sample of computational models of semantic relatedness, classified according to the sources of information they exploit. We report models that are best at each of the two dimensions of semantic relatedness and those that achieve a good balance between the …

Large-Scale Green Supplier Selection Approach Under A Q-Rung Interval-Valued Orthopair Fuzzy Environment, Limei Liu, Wenzhi Cao, Biao Shi, Ming Tang

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As enterprises pay more and more attention to environmental issues, the green supply chain management (GSCM) mode has been extensively utilized to guarantee profit and sustainable development. Greensupplierselection(GSS),whichisakeysegmentofGSCM,hasbeeninvestigated to put forward plenty of GSS approaches.

The "Invisible Hand" Of Peer Review: The Implications Of Author-Referee Networks On Peer Review In A Scholarly Journal, Pierpaolo Dondio, Niccolo Casnici, Nigel Gilbert, Francisco Grimaldo, Flaminio Squazzoni

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Peer review is not only a quality screening mechanism for scholarly journals. It also connects authors and referees either directly or indirectly. This means that their positions in the network structure of the community could influence the process, while peer review could in turn influence subsequent networking and collaboration. This paper aims to map these complex network implications by looking at 2232 author/referee couples in an interdisciplinary journal that uses double blind peer review. By reconstructing temporal co-authorship networks, we found that referees tended to recommend more positively submissions by authors who were within three steps in their collaboration network. …

Adaptive Heuristics That (Could) Fit: Information Search And Communication Patterns In An Online Forum Of Investors Under Market Uncertainty, Niccolo Casnici, Marco Castellani, Flaminio Squazzoni, Manuela Testa, Pierpaolo Dondio

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This article examines information-search heuristics and communication patterns in an online forum of investors during a period of market uncertainty. Global connections, real-time communication, and technological sophistication have created an unpredictable market environment. As such, investors try to deal with semantic, strategic, and operational uncertainty by following heuristics that reduce information redundancy. In this study, we have tried to find traces of cognitive communication heuristics in a large-scale data set including 8 years of online posts (2004–2012) for a forum of Italian investors. We identified various market volatility conditions on a daily basis to understand the influence of market uncertainty …

Direct Instruction And Its Extension With A Community Of Inquiry: A Comparison Of Mental Workload, Performance And Efficiency, Giuliano Orru, Luca Longo

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This paper investigates the efficiency of two instructional design conditions: a traditional design based on the direct instruction approach to learning and its extension with a collaborative activity based upon the community of inquiry approach to learning. This activity was built upon a set of textual trigger questions to elicit cognitive abilities and support knowledge formation. A total of 115 students participated in the experiments and a number of third-level computer science classes where divided in two groups. A control group of learners received the former instructional design while an experimental group also received the latter design. Subsequently, learners of …

Refractive Error And Visual Impairment In Ireland Schoolchildren, Síofra Harrington, Jim Stack, Kathryn Saunders, Veronica O'Dwyer

Articles

Aim To report refractive error prevalence and visual impairment in Republic of Ireland (henceforth 'Ireland') schoolchildren.

Methods The Ireland Eye Study examined 1626 participants (881 boys, 745 girls) in two age groups, 6–7 years (728) and 12–13 years (898), in Ireland between June 2016 and January 2018. Participating schools were selected by stratified random sampling, representing a mix of school type (primary/postprimary), location (urban/rural) and socioeconomic status (disadvantaged/advantaged). Examination included monocular logarithm of the minimum angle of resolution (logMAR) presenting visual acuity (with spectacles if worn) and cycloplegic autorefraction (1% Cyclopentolate Hydrochloride). Parents completed a questionnaire to ascertain participants’ lifestyle. …

Concentric Double Hollow Grid Cathode Discharges, C. T. Teodorescu-Soare, S. A. Irimiciuc, C. Ionita, D. G. Dimitriu, B. Hodoroaba, T. O'Hara, O. Vasilovici, L. Amarandi, R. W. Schrittwieser

Articles

A new cathode system, consisting of two concentric spherical hollow grids with two aligned orifices, is investigated by space-resolved Langmuir probe measurements and non-linear dynamics analysis. Negative biases of this spherical hollow grids arrangement lead to the formation of two complex space charge structures in the regions of the orifices. The overall dynamics of the current-voltage characteristic (I–V characteristic) of each discharge is characterized by strong oscillatory behaviour with various waveforms correlated with jumps in the static I–V characteristics. Space-resolved measurements through the two aligned orifices of the two grids show a peak increase of the electron temperature and particle …

The Case Against Expanding Defamation Law, Yonathan A. Arbel, Murat Mungan

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It is considered axiomatic that defamation law protects reputation. This proposition--commonsensical, pervasive, and influential-- is faulty. Underlying this fallacy is the failure to appreciate audience effects: the interaction between defamation law and members of the audience.

Defamation law seeks to affect the behavior of speakers by making them bear a cost for spreading untruthful information. Invariably, however, the law will also affect members of the audience, as statements made in a highly regulated environment tend to appear more reliable than statements made without accountability. Strict defamation law would tend to increase the perceived reliability of statements, which in some cases …

Evaluating Food Safety Knowledge And Practices Among Foodservice Staff In Al Madinah Hospitals, Saudi Arabia, Anushree Priyadarshini, Nada Ahmad Alqurashi, Amit Jaiswal

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This study examines food safety knowledge and practices of food service staff in Al Madinah hospitals, Saudi Arabia. A total of 163 food service staff participated voluntarily from 10 hospitals across the city of Al Madinah. The participants completed a questionnaire composed of threeparts: Generalcharacteristics,foodsafetyknowledge,andfoodsafetypractices. Resultsshowed that respondents generally had good food safety knowledge with the highest pass rate of 77.9% for knowledge of cross contamination followed by 52.8% for knowledge of food poisoning, and 49.7% of knowledge of food storage. Food safety practices were also strongly observed in the hospitals with a pass rate of 92.6%. Food safety knowledge …

An Exploratory Study Of Extremesport Athletes’ Nature Interactions:From Well-Being To Pro-Environmental Behavior, Tadhg Eoghan Macintyre, Andree M. Walkin, Juergen Beckmann, Giovanna Calogiuri, Susan Gritzka, Greig Oliver, Aoife Donnelly, Giles Warrington

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Traditionally, perceptions about extreme sport athletes being disconnected fromnature and a risk-taking population have permeated the research literature. Drawingupon theoretical perspectives from environmental, sport, organizational and positivepsychology, this qualitative study attempts to explore the lived experiences of fourmale and four female extreme sport athletes. The purpose of this study was togain insight and understanding into the individuals’ attitudes toward the benefits ofextreme sport activities for well-being, resilience and pro-environmental behavior. Eightparticipants (Mean age = 40.5 years;SD=±12.9) provided written informed consentto partake in semi-structured interviews. Each athlete provided written consented toallow the publication of their identifiable data and in order to …

Plasma-Treated Air And Water—Assessment Of Synergistic Antimicrobial Effects For Sanitation Of Food Processing Surfaces And Environment, Uta Schnabel, Oliver Handorf, Kateryna Yarova, Björn Zessin, Susann Zechlin, Diana Sydow, Elke Zellmer, Jörg Stachowiak, Mathias Andrasch, Harald Below, Jörg Ehlbeck

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The synergistic antimicrobial effects of plasma-processed air (PPA) and plasma-treated water (PTW), which are indirectly generated by a microwave-induced non-atmospheric pressure plasma, were investigated with the aid of proliferation assays. For this purpose, microorganisms (Listeriamonocytogenes, Escherichiacoli, Pectobacteriumcarotovorum, sporulatedBacillusatrophaeus) were cultivated as monocultures on specimens with polymeric surface structures. Both the distinct and synergistic antimicrobial potential of PPA and PTW were governed by the plasma-on time (5–50 s) and the treatment time of the specimens with PPA/PTW (1–5 min). In single PTW treatment of the bacteria, an elevation of the reduction factor with increasing treatment time could be observed (e.g., reduction …

High Voltage Atmospheric Cold Air Plasma Control Of Bacterial Biofilms On Fresh Produce, Apurva Patange, D. Boehm, Dana Ziuzina, Patrick J. Cullen, Brendan Gilmore, Paula Bourke

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Atmospheric cold plasma (ACP) offers great potential for decontamination of food borne pathogens. This study examined the antimicrobial efficacy of ACP against a range of pathogens of concern to fresh produce comparing planktonic cultures, monoculture biofilms (Escherichia coli, Salmonella enterica, Listeria monocytogenes, Pseudomonas fluorescens) and mixed culture biofilms (Listeria monocytogenes and Pseudomonas fluorescens). Biotic and abiotic surfaces commonly occurring in the fresh food industry were investigated. Microorganisms showed varying susceptibility to ACP treatment depending on target and process factors. Bacterial biofilm populations treated with high voltage (80 kV) ACP were reduced significantly (p <  0.05) in both mono- and mixed species biofilms after 60 s of treatment and yielded non-detectable levels after extending treatment time to 120 s. However, an extended time was required to reduce the challenge mixed culture biofilm of L. monocytogenes and P. fluorescens inoculated on lettuce, which was dependent on biofilm formation conditions and substrate. Contained treatment for 120 s reduced L. monocytogenes and P. fluorescens inoculated as mixed cultures on lettuce (p <  0.05) by 2.2 and 4.2 Log10 CFU/ml respectively. When biofilms were grown at 4 °C on lettuce, there was an increased resistance to ACP treatment by comparison with biofilm grown at temperature abuse conditions of 15 °C. Similarly, L. monocytogenes and P. fluorescens exposed to cold stress (4 °C) for 1 h demonstrated increased tolerance to ACP treatment compared to non-stressed cells. These finding demonstrates that bacterial form, mono versus mixed challenges as well as environmental stress conditions play an important role in ACP inactivation efficacy.

Compact Broadband Triple-Ring Five-Port Reflectometer For Microwave Brain Imaging Applications, Toufiq Md Hossain, Mohd Faizal Jamlos, Mohd Aminudin Jamlos, Ping Jack Shoh, Siti Zuraidah Ibrahim, Muammar Mohamad Isa, Dominque M.M.-P. Schreurs, Adam Narbudowicz, Mohd Fairusham Ghazali

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The broadband five-port refectometer (FPR) is proposed using a triple-ring based technique. The design introduces a tapering in the inter-ring transmission lines (TLs), which provides additional degrees of freedom for optimization and contributes to increased bandwidth. The miniaturization strategy allows incorporating the third ring without signifcant size increase. In addition, a method for expressing the effective physical dimension of a planar symmetric FPR is also presented in an easily comprehensible way, which can be implemented for other symmetric planar junctions with more than four ports. The proposed design comprises three concentric rings with phase-shifting arrangements between the inter-ring TLs and …