bluuebunny/crossref_metadata_2025_split huggingface dataset:
Atlas® Listeria monocytogenes LmG2 Detection Assay Using Transcription Mediated Amplification to Detect Listeria monocytogenes in Selected Foods and Stainless Steel Surface
Authors: Bres Vanessa , Yang Hua , Hsu Ernie , Ren Yan , Cheng Ying , Wisniewski Michele , Hanhan Maesa , Zaslavsky Polina , Noll Nathan , Weaver Brett , Campbell Paul , Reshatoff Michael , Becker Michael 
Published: September 2014

Abstract
The Atlas Listeria monocytogenes LmG2 Detection Assay, developed by Roka Bioscience Inc., was compared to a reference culture method for seven food types (hot dogs, cured ham, deli turkey, chicken salad, vanilla ice cream, frozen chocolate cream pie, and frozen cheese pizza) and one surface (stainless steel, grade 316). A 125 g portion of deli turkey was tested using a 1:4 food:media dilution ratio, and a 25 g portion for all other foods was tested using 1:9 food:media dilution ratio. The enrichment time and media for Roka's method was 24 to 28 h for 25 g food samples and environmental surfaces, and 44 to 48 h for 125 g at 35 ± 2°C in PALCAM broth containing 0.02 g/L nalidixic acid. Comparison of the Atlas Listeria monocytogenes LmG2 Detection Assay to the reference method required an unpaired approach. For each matrix, 20 samples inoculated at a fractional level and five samples inoculated at a high level with a different strain of Listeria monocytogenes were tested by each method. The Atlas Listeria monocytogenes LmG2 Detection Assay was compared to the Official Methods of Analysis of AOAC INTERNATIONAL 993.12 method for dairy products, the U.S. Department of Agriculture, Food Safety and Inspection Service, Microbiology Laboratory Guidebook 8.08 method for ready-to-eat meat and environmental samples, and the U.S. Food and Drug Administration Bacteriological Analytical Manual, Chapter 10 method for frozen foods. In the method developer studies, Roka's method, at 24 h (or 44 h for 125 g food samples), had 126 positives out of 200 total inoculated samples, compared to 102 positives for the reference methods at 48 h. In the independent laboratory studies, vanilla ice cream, deli turkey and stainless steel grade 316 were evaluated. Roka's method, at 24 h (or 44 h for 125 g food samples), had 64 positives out of 75 total inoculated samples compared to 54 positives for the reference methods at 48 h. The Atlas Listeria monocytogenes LmG2 Detection Assay detected all 50 L. monocytogenes strains that encompassed 13 serotypes across the various lineages and none of the 30 exclusive organisms, including seven other Listeria species. The product consistency and kit stability studies revealed no statistical differences between the three lots tested or to the term of the shelf life. Finally, the robustness study demonstrated no statistical differences when samples were incubated at 33 ± 2°C or 37 ± 2°C, when enrichment aliquots were 1.3 mL or 1.7 mL, or when the samples were analyzed the same day or five days later. Overall the Atlas Listeria monocytogenes LmG2 Detection Assay is statistically equivalent to or better than the reference methods and is robust to the tested variations.
Ultrasonic Extraction with Ultra-Performance Liquid Chromatography/Tandem Mass Spectrometry for the Determination of Ochratoxin A in Processed Cereal Products
Authors: Nguyen Kieu Thi Ngoc , Ryu Dojin 
Published: September 2014

Abstract
A rapid, simple, and reliable method using ultra-performance LC/MS/MS (UPLC/MS/MS) was developed for determination of ochratoxin A (OTA) in processed cereal products. OTA was ultrasonically extracted from the sample with acetonitrile–water (80 + 20, v/v), and the extract was then injected into the UPLC/MS/MS system after filtration. The calibration curves had good linearity with coefficients of determination greater than 0.999. Recoveries of OTA were in the range of 90–104%. LOD and LOQ of OTA in samples were 0.6 and 2.0 ng/g, respectively, and no significant matrix effect was found. This method was applied to determine OTA in 25 oat-based cereal samples. OTA was detected in five samples (20%) in the range of 2.4 to 7.3 ng/g.
Fingerprinting of Secondary Metabolites of Liverworts: Chemosystematic Approach
Authors: Ludwiczuk Agnieszka , Asakawa Yoshinori 
Published: September 2014

Abstract
The relationship between various types of plants can be predicted based on the similarity in the chemical substances present in them. Compounds that belong to the category of secondary metabolites are of great value in identifying such relationships. Additionally, results from the chemical investigations, together with the other biological or genetic information, can help to understand real relationships among the taxa. Liverworts are small spore-forming plants with simple morphological organization. On the other hand, many liverwort species demonstrate wide geographical distribution and grow under diverse ecological conditions. Because of this, the identification of these plants is especially challenging. One of the outstanding features of the liverworts is their chemistry. They produce a wide array of secondary metabolites, mainly terpenoids and aromatic compounds. Many of these compounds are characterized by unique structures, and some have not been found in any other plants, fungi, or marine organisms. The potential use of chromatographic fingerprinting of the liverworts, as complementary to morphological and genetic information, to resolve the taxonomic problems at the species, genus, and family levels are discussed.
História e Internet: conexões possíveis
Authors: Oliveira Nucia Alexandra Silva de 
Published: September 2014

Este artigo pretende problematizar as conexões possíveis entre história e internet. O ponto de partida de tal discussão é a constatação da presença da internet na vida social e dos impactos desta mídia nas formas de obter e publicar conhecimentos. Procura-se, de modo mais específico, discutir como a internet tem produzido novos documentos para o trabalho do historiador e, ainda, como tem lidado com eles. Para isso, listam-se alguns trabalhos feitos por historiadores que utilizam a internet como fonte. Nesta parte do trabalho, a ideia é apontar os documentos digitais escolhidos pelos historiadores para a realização de suas análises, ad dificuldades encontradas e as potencialidades destas fontes. Compreende-se que a internet oferece grandes possibilidades ao trabalho historiográfico e, em particular, à História do Tempo Presente. Na segunda parte deste artigo são trazidas informações a partir da pesquisa intitulada “www.historia.com: uma investigação sobre marcos históricos brasileiros tematizados em sítios eletrônicos”. Seu objetivo é investigar narrativas produzidas e apresentadas em sites de pesquisa escolar a respeito de marcos históricos brasileiros. Nesta etapa da discussão, o propósito é debater os usos da história feitos por estes espaços. Percebe-se que se têm apresentado narrativas em que os fatos históricos aparecem de forma linear, simplificada e seguindo o que se costuma chamar de história tradicional. Nesse duplo movimento de observação, espera-se contribuir com o debate sobre esta importante questão: produção e divulgação do saber histórico. Palavras-chave: História – Estudo e Ensino; Internet.
Intolerância ao Sul da América: estudo comparado de grupos fascistas do Brasil e da Argentina na Internet (1996-2007)
Authors: Maynard Dilton Cândido Santos 
Published: September 2014

Este artigo investiga os usos da internet realizados por grupos de fascistas do Brasil e da Argentina. Utilizamos como principais fontes sites declaradamente fascistas criados pouco depois da popularização da internet. Através da perspectiva oferecida pela metodologia comparativa defendida por Marc Bloch, o texto analisa a relação entre as homepages brasileiras e o mais conhecido site sul-americano de extrema direita, Ciudad Libertad Opinión, criado em 1999, com a principal finalidade de disseminar ideias fascistas e prestar apoio a outros grupos extremistas. Apontamos o papel estratégico que o portal Libre Opinión cumpriu como articulador entre os grupos fascistas da América do Sul, sendo um colaborador fundamental na difusão de páginas brasileiras marcadas por veicularem regularmente mensagens xenófobas, racistas, antissemitas e homofóbicas.Palavras-chave: Fascismo – Brasil; Fascismo – Argentina; Internet; América do sul.
Para americano e brasileiro ver: uma memória das relações bilaterais por meio da rede social Flickr
Authors: Saraiva João Gilberto Neves 
Published: September 2014

Este trabalho investiga a memória das relações bilaterais produzida pela Embaixada dos Estados Unidos no Brasil na rede social Flickr nos primeiros meses de governo do presidente democrata Barack Obama. Analisa-se aqui o conjunto de imagens e textos de 19 postagens realizadas pela embaixada na rede no primeiro semestre de 2009. São estabelecidos elos entre a produção da memória, a conjuntura política norte-americana e mitos políticos estadunidenses, como Abraham Lincoln e John Kennedy. Também problematiza as formas lembrar e esquecer diversos eventos das relações bilaterais ao longo do século XX e XXI, além dos posicionamentos publicados na rede social em relação à política e à história do Brasil.Palavras-chave: Redes sociais online; Flickr; Presidentes – Estados Unidos.
Invariant soil water potential at zero microbial respiration explained by hydrological discontinuity in dry soils
Authors: Manzoni S. , Katul G. 
Published: September 2014

AbstractSoil microbial respiration rates decrease with soil drying, ceasing below water potentials around −15 MPa. A proposed mechanism for this pattern is that under dry conditions, microbes are substrate limited because solute diffusivity is halted due to breaking of water film continuity. However, pore connectivity estimated from hydraulic conductivity and solute diffusivity (at Darcy's scale) is typically interrupted at much less negative water potentials than microbial respiration (−0.1 to −1 MPa). It is hypothesized here that the more negative respiration thresholds than at the Darcy's scale emerge because microbial activity is restricted to microscale soil patches that retain some hydrological connectivity even when it is lost at the macroscale. This hypothesis is explored using results from percolation theory and meta‐analyses of respiration‐water potential curves and hydrological percolation points. When reducing the spatial scale from macroscale to microscale, hydrological and respiration thresholds become consistent, supporting the proposed hypothesis.
Variability in categories of Arctic sea ice in Fram Strait
Authors: Hansen E. , Ekeberg O.‐C. , Gerland S. , Pavlova O. , Spreen G. , Tschudi M. 
Published: September 2014

AbstractAn attempt to quantify the temporal variability in the volume composition of Arctic sea ice is presented. Categories of sea ice in the Transpolar Drift in Fram Strait are derived from monthly ice thickness distributions obtained by moored sonars (1990–2011). The inflection points on each side of the old ice modal peak are used to separate modal ice from ice which is thinner and thicker than ice in the modal range. The volume composition is then quantified through the relative amount of ice belonging to each of the three categories thin, modal, and thick ice in the monthly ice thickness distributions. The trend of thin ice was estimated to be negative at −8.8% per decade (relative to the long‐term mean), which was compensated for by increasing trends in modal and thick ice of 7.9% and 4.7% per decade, respectively. A 7–8 year cycle is apparent in the thin and thick ice records, which may explain a loss of deformed ice since 2007. We also quantify how the categories contribute to the mean ice thickness over time. Thick (predominantly deformed) ice dominates the mean ice thickness, constituting on average 66% of the total mean. Following the loss of deformed ice since 2007, the contribution of thick ice to the mean decreased from 75% to 52% at the end of the record. Thin deformed ice did not contribute to this reduction; it was pressure ridges thicker than 5 m that were lost and hence caused the decrease in mean ice thickness.
TaiWan Ionospheric Model (TWIM) prediction based on time series autoregressive analysis
Authors: Tsai L. C. , Macalalad Ernest P. , Liu C. H. 
Published: September 2014

AbstractAs described in a previous paper, a three‐dimensional ionospheric electron density (Ne) model has been constructed from vertical Ne profiles retrieved from the FormoSat3/Constellation Observing System for Meteorology, Ionosphere, and Climate GPS radio occultation measurements and worldwide ionosonde foF2 and foE data and named the TaiWan Ionospheric Model (TWIM). The TWIM exhibits vertically fitted α‐Chapman‐type layers with distinct F2, F1, E, and D layers, and surface spherical harmonic approaches for the fitted layer parameters including peak density, peak density height, and scale height. To improve the TWIM into a real‐time model, we have developed a time series autoregressive model to forecast short‐term TWIM coefficients. The time series of TWIM coefficients are considered as realizations of stationary stochastic processes within a processing window of 30 days. These autocorrelation coefficients are used to derive the autoregressive parameters and then forecast the TWIM coefficients, based on the least squares method and Lagrange multiplier technique. The forecast root‐mean‐square relative TWIM coefficient errors are generally <30% for 1 day predictions. The forecast TWIM values of foE and foF2 values are also compared and evaluated using worldwide ionosonde data.
Selektive C‐C‐Bindungsspaltung zur stereoselektiven Synthese acyclischer Systeme
Authors: Marek Ilan , Masarwa Ahmad , Delaye Pierre‐Olivier , Leibeling Markus 
Published: September 2014

AbstractChemiker setzen seit jeher auf die Entwicklung kreativer Strategien zum Aufbau von Kohlenstoff‐Kohlenstoff‐ und Kohlenstoff‐Heteroatom‐Bindungen. Innerhalb dieses Aufsatzes wird ein weiterer Ansatz eingeführt, der schwierige Molekülstrukturen durch selektive C‐C‐Bindungsspaltung zugänglich macht. Obwohl C‐C‐Einfachbindungen nur eingeschränkt reaktiv sind, soll gezeigt werden, dass diese Methodik einen regio‐, diastereo‐ und enantioselektiven Zugang zu facettenreichen Produkten bietet. Die Entwicklung solcher Strategien mag in Zukunft einen schwerwiegenden Einfluss auf die Syntheseplanung haben und zu neuen und innovativen Prozessen unter Verwendung einfacher oder komplexer Kohlenwasserstoffe führen.
Electrical Network of Single‐Crystalline Metal Oxide Nanoclusters Wired by π‐Molecules
Authors: Tsunashima Ryo , Iwamoto Yoshifumi , Baba Yusuke , Kato Chisato , Ichihashi Katsuya , Nishihara Sadafumi , Inoue Katsuya , Ishiguro Katsuya , Song Yu‐Fei , Akutagawa Tomoyuki 
Published: September 2014

AbstractIn a mixed‐valence polyoxometalate, electrons are usually delocalized within the cluster anion because of low level of inter‐cluster interaction. Herein, we report the structure and electrical properties of a single crystal in which mixed‐valence polyoxometalates were electrically wired by cationic π‐molecules of tetrathiafulvalene substituted with pyridinium. Electron‐transport characteristics are suggested to represent electron hopping through strong interactions between cluster and cationic π‐molecules.
Reversal of the Regiochemistry in the Rhodium‐Catalyzed [4+3] Cycloaddition between Vinyldiazoacetates and Dienes
Authors: Guzmán Pablo E. , Lian Yajing , Davies Huw M. L. 
Published: September 2014

AbstractA regio‐, diastereo‐, and enantioselective [4+3] cycloaddition between vinylcarbenes and dienes has been achieved using the dirhodium tetracarboxylate catalyst [Rh2(S‐BTPCP)4]. This methodology provides facile access to 1,4‐cycloheptadienes that are regioisomers of those formed from the tandem cyclopropanation/Cope rearrangement reaction of vinylcarbenes with dienes.
Synthesis and Reactivity of a CAAC–Aminoborylene Adduct: A Hetero‐Allene or an Organoboron Isoelectronic with Singlet Carbenes
Authors: Dahcheh Fatme , Martin David , Stephan Douglas W. , Bertrand Guy 
Published: September 2014

AbstractA one‐electron reduction of a cyclic (alkyl)(amino)carbene (CAAC)–bis(trimethylsilyl)aminodichloroborane adduct leads to a stable aminoboryl radical. A second one‐electron reduction gives rise to a CAAC–aminoborylene adduct, which features an allenic structure. However, in manner similar to that of stable electrophilic singlet carbenes, this compound activates small molecules, such as CO and H2.
Highly Stable Water‐Soluble Platinum Nanoparticles Stabilized by Hydrophilic N‐Heterocyclic Carbenes
Authors: Baquero Edwin A. , Tricard Simon , Flores Juan Carlos , de Jesús Ernesto , Chaudret Bruno 
Published: September 2014

AbstractControlling the synthesis of stable metal nanoparticles in water is a current challenge in nanochemistry. The strategy presented herein uses sulfonated N‐heterocyclic carbene (NHC) ligands to stabilize platinum nanoparticles (PtNPs) in water, under air, for an indefinite time period. The particles were prepared by thermal decomposition of a preformed molecular Pt complex containing the NHC ligand and were then purified by dialysis and characterized by TEM, high‐resolution TEM, and spectroscopic techniques. Solid‐state NMR studies showed coordination of the carbene ligands to the nanoparticle surface and allowed the determination of a 13C–195Pt coupling constant for the first time in a nanosystem (940 Hz). Additionally, in one case a novel structure was formed in which platinum(II) NHC complexes form a second coordination sphere around the nanoparticle.
Copolymer MCJS as a retarder of the acid–rock reaction speed for the stimulation of deep carbonate reservoirs
Authors: Quan Hongping , Li Huan , Huang Zhiyu , Dai Shanshan , Jiang Jifeng 
Published: September 2014

ABSTRACTThe fast reaction rate between hydrochloric acid and carbonates causes the most acid consumption near the wells, and the acid cannot penetrate the deeper places of the carbonate reservoir; this limits the application of acidizing modifications for the reservoir. In this study, we chose acrylamide, 2‐acrylamido‐2‐methyl‐1‐propane sulfonic acid (AMPS), allyl alcohol polyoxyethylene ether (APEG), and N‐dimethyl‐N‐vinyl nonadecan‐1‐aminium chloride (DMAAC‐18) to synthesize a quadripolymer (MCJS) that could reduce the reaction rate mentioned previously. The molecular structure of MCJS was characterized by Fourier transform infrared and 1H‐NMR spectroscopy. The molecular weight and molecular weight distribution of MCJS was determined by gel permeation chromatography. Carbonate rock was analyzed by X‐ray diffraction and energy‐dispersive X‐ray spectroscopy. The retarding properties of the acid mixed with MCJS (MCJS acid) were investigated, and the resulting reaction rate between the acid and carbonate decreased obviously, even at a low viscosity. Scanning electron microscopy and core flood experiments showed that the MCJS could be adsorbed on the carbonate rock surface and form a hydrated film that delayed the reaction. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41471.
Efficient and Selective Oxidation of D‐Glucose into Gluconic acid under Low‐Frequency Ultrasonic Irradiation
Authors: Rinsant Damien , Chatel Gregory , Jérôme François 
Published: September 2014

AbstractThe production of gluconic acid from D‐glucose represents an attractive target for industry. In this work, we propose an efficient, eco‐friendly, and selective method to oxidize D‐glucose with aqueous H2O2 in the presence of FeSO4 as a catalyst. The reaction was improved significantly under ultrasonic (US) activation, which led to excellent yields in only a few minutes. In addition, we determined that the reaction occurred through a sono‐Fenton process by studying the production of hydroxyl radicals and optimizing the experimental conditions of the reaction. The energy consumption of the process was also investigated in this study.
Activation of Small Molecules by Phosphorus Biradicaloids
Authors: Hinz Alexander , Kuzora Rene , Rosenthal Uwe , Schulz Axel , Villinger Alexander 
Published: September 2014

AbstractThe reactivity of biradicaloid [P(μ‐NTer)]2 was employed to activate small molecules bearing single, double, and triple bonds. Addition of chalcogens (O2, S8, Sex and Tex) led to the formation of dichalcogen‐bridged P2N2 heterocycles, except from the reaction with molecular oxygen, which gave a P2N2 ring featuring a dicoordinated PIII and a four‐coordinated PV center. In formal [2πe+2πe] addition reactions, small unsaturated compounds such as ethylene, acetylene, acetone, acetonitrile, tolane, diphenylcarbodiimide, and bis(trimethylsilyl)sulfurdiimide are readily added to the P2N2 heterocycle of the biradicaloid [P(μ‐NTer)]2, yielding novel heteroatom cage compounds. The synthesis, reactivity, and bonding of the biradicaloid [P(μ‐NTer)]2 were studied in detail as well as the synthesis, properties, and structural features of all addition products.
Gender Differences in Coronary Artery Diameter Are Not Related to Body Habitus or Left Ventricular Mass
Authors: Hiteshi Amit K. , Li Dong , Gao Yanlin , Chen Andy , Flores Ferdinand , Mao Song Shou , Budoff Matthew J. 
Published: September 2014

AbstractBackgroundSmaller coronary artery diameter portends worse outcomes after coronary artery bypass grafting (CABG) and percutaneous coronary intervention (PCI). The suggestion that women have smaller coronary artery diameters than men has not been validated by a large‐scale study.HypothesisWe sought to confirm a gender difference with respect to coronary artery diameter, even after accounting for body habitus and left ventricular mass (LVM).MethodsFrom 4200 subjects evaluated for cardiovascular disease by computed tomography angiography, we selected 710 subjects (383 males, 327 females) with coronary artery calcium (CAC) scores <100, eliminating patients with artery remodeling. Diameters of the left main (LM), left anterior descending (LAD), left circumflex (CX), and right coronary arteries (RCA), were measured. Measurements were compared using a 2‐sample t test and the multiple regression model, accounting for body habitus and LVM.ResultsAfter adjusting for age, race, weight, height, body mass index, body surface index, LVM, and CAC, women have smaller diameters in the LM (males 4.35 mm, females 3.91 mm), LAD (males 3.54 mm, females 3.24 mm), CX (males 3.18, females 2.75 mm), and RCA (males 3.70 mm, females 3.26 mm) (P < 0.001). This difference is not related to body habitus or LVM.ConclusionsGender significantly influences artery diameter of the LM, LAD, CX, and RCA. This may warrant gender specific approaches during PCI and CABG. As neither body habitus nor LVM relate to the difference in coronary artery diameter, our study encourages a search for inherent differences between genders that can account for this difference.