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Douglas H Fabini, Constantinos C Stoumpos, Geneva Laurita, Andreas Kaltzoglou, Athanassios G Kontos, Polycarpos Falaras, Mercouri G Kanatzidis, Ram Seshadri
The structure of the hybrid perovskite HC(NH2 )2 PbI3 (formamidinium lead iodide) reflects competing interactions associated with molecular motion, hydrogen bonding tendencies, thermally activated soft octahedral rotations, and the propensity for the Pb(2+) lone pair to express its stereochemistry. High-resolution synchrotron X-ray powder diffraction reveals a continuous transition from the cubic α-phase (Pm3‾ m, #221) to a tetragonal β-phase (P4/mbm, #127) at around 285 K, followed by a first-order transition to a tetragonal γ-phase (retaining P4/mbm, #127) at 140 K...
November 10, 2016: Angewandte Chemie
Fernanda Kokowicz Pilatti, Fernanda Ramlov, Eder Carlos Schmidt, Christopher Costa, Eva Regina de Oliveira, Claudia M Bauer, Miguel Rocha, Zenilda Laurita Bouzon, Marcelo Maraschin
Fossil fuels, e.g. gasoline and diesel oil, account for substantial share of the pollution that affects marine ecosystems. Environmental metabolomics is an emerging field that may help unravel the effect of these xenobiotics on seaweeds and provide methodologies for biomonitoring coastal ecosystems. In the present study, FTIR and multivariate analysis were used to discriminate metabolic profiles of Ulva lactuca after in vitro exposure to diesel oil and gasoline, in combinations of concentrations (0.001%, 0...
November 12, 2016: Marine Pollution Bulletin
Angela De Bonis, Antonio Santagata, Agostino Galasso, Alessandro Laurita, Roberto Teghil
Laser ablation of bulk target in liquid allows to obtain stable nanoparticles and nanostructures, also in metastable phases, limiting the use of hazardous reagents and extreme reaction conditions. Titanium carbide (TiC) is a ceramic compound with several technological applications ranging from biocompatible materials to wear resistant coatings. The possibility to obtain core/shell structures expands its range of application due to the ability of modify the surface properties of the core ceramic material. TiC and metallic titanium targets have been ablated by means of an ultra-short laser source in different liquid media (water, acetone, n-hexane and toluene)...
August 31, 2016: Journal of Colloid and Interface Science
Douglas H Fabini, Geneva Laurita, Jonathon S Bechtel, Constantinos C Stoumpos, Hayden A Evans, Athanassios G Kontos, Yannis S Raptis, Polycarpos Falaras, Anton Van der Ven, Mercouri G Kanatzidis, Ram Seshadri
Stable s(2) lone pair electrons on heavy main-group elements in their lower oxidation states drive a range of important phenomena, such as the emergence of polar ground states in some ferroic materials. Here we study the perovskite halide CsSnBr3 as an embodiment of the broader materials class. We show that lone pair stereochemical activity due to the Sn(2+) s(2) lone pair causes a crystallographically hidden, locally distorted state to appear upon warming, a phenomenon previously referred to as emphanisis...
September 14, 2016: Journal of the American Chemical Society
Thiago de Oliveira Mendes, Liliane Pereira Pinto, Laurita Dos Santos, Vamshi Krishna Tippavajhala, Claudio Alberto Téllez Soto, Airton Abrahão Martin
No abstract text is available yet for this article.
July 1, 2016: Journal of Biomedical Optics
Tilak Pasala, Mary Dettmer, Peter J Leo, Kenneth R Laurita, Elizabeth S Kaufman
INTRODUCTION: In experimental models, spatial dispersion of repolarization (DOR) due to discordant cellular alternans predisposes to ventricular fibrillation. To test the hypothesis that microvolt T-wave alternans (MTWA) in humans causes spatial DOR, we measured Tpeak-Tend interval (Tpe) and Tpe/QT ratio, electrocardiographic indices of spatial DOR. METHODS: Mean Tpe and Tpe/QT were compared in ischemic cardiomyopathy patients with positive and negative MTWA studies...
September 2016: Journal of Electrocardiology
Chiara Gualandi, Nora Bloise, Nicolò Mauro, Paolo Ferruti, Amedea Manfredi, Maurilio Sampaolesi, Anna Liguori, Romolo Laurita, Matteo Gherardi, Vittorio Colombo, Livia Visai, Maria Letizia Focarete, Elisabetta Ranucci
Electrospun poly-l-lactic acid (PLLA) nanofiber mats carrying surface amine groups, previously introduced by nitrogen atmospheric pressure nonequilibrium plasma, are embedded into aqueous solutions of oligomeric acrylamide-end capped AGMA1, a biocompatible polyamidoamine with arg-gly-asp (RGD)-reminiscent repeating units. The resultant mixture is finally cured giving PLLA-AGMA1 hydrogel composites that absorb large amounts of water and, in the swollen state, are translucent, soft, and pliable, yet as strong as the parent PLLA mat...
June 10, 2016: Macromolecular Bioscience
Prasongchai Sattayaprasert, Drew M Nassal, Xiaoping Wan, Isabelle Deschenes, Kenneth R Laurita
BACKGROUND: The paracrine action of non-cardiac progenitor cells is robust, but not well understood. Mesenchymal stem cells (MSC) have been shown to enhance calcium (Ca(++)) cycling in myocytes. Therefore, we hypothesized that MSCs can suppress cardiac alternans, an important arrhythmia substrate, by paracrine action on Ca(++) cycling. METHODS AND RESULTS: Human cardiac myocyte monolayers derived from iPS cells (hCM) were cultured without or with human MSCs (hMSC) directly or plated on a transwell insert...
September 2016: Journal of Molecular and Cellular Cardiology
Fernanda Kokowicz Pilatti, Fernanda Ramlov, Eder Carlos Schmidt, Marianne Kreusch, Débora Tomazi Pereira, Christopher Costa, Eva Regina de Oliveira, Cláudia M Bauer, Miguel Rocha, Zenilda Laurita Bouzon, Marcelo Maraschin
Refined fuels have considerable share of pollution of marine ecosystems. Gasoline is one of the most consumed fuel worldwide, but its effects on marine benthic primary producers are poorly investigated. In this study, Ulva lactuca was chosen as a biological model due to its cosmopolitan nature and tolerance to high levels and wide range of xenobiotics and our goal was to evaluate the effects of gasoline on ultrastructure and metabolism of that seaweed. The experimental design consisted of in vitro exposure of U...
August 2016: Chemosphere
Gabrielle da Luz, Marisa Jádna Silva Frederico, Allisson Jhonatan Gomes Castro, Ana Luiza Ludwig Moraes, Francieli Kanumfre de Carvalho, Leandro Espíndola, Éder Carlos Schmidt, Zenilda Laurita Bouzon, Moacir Geraldo Pizzolatti, Fátima Regina Mena Barreto Silva
AIM: Triterpenes and their derivatives influence on carbohydrate metabolism. In vivo and in vitro treatment investigated the effect of the natural triterpene fern-9(11)-ene-2α,3β-diol (1), isolated from Croton heterodoxus, and a derivative triterpene (2) on glucose homeostasis. MAIN METHODS: The antidiabetic effect of the crude extract from C. heterodoxus leaves, the natural triterpene (1) as well as the derivative triterpene (2) were assayed on glucose tolerance...
June 1, 2016: Life Sciences
Geneva Laurita, Rosa Grajczyk, Matthew Stolt, Italo Coutinho, Arthur W Sleight, M A Subramanian
Structural disorder can play an important role in the electrical properties of correlated materials. In this work we examine the average and local disorder in hollandites A(x)Ru4O8 (A(+) = K, Rb, Rb(1-x)Na(x)) through neutron total scattering techniques. Samples with A(+) = Rb, Rb(1-x)Na(x) exhibit the largest amount of local disorder as evidenced by higher atomic displacement parameters, and as a result, a weakened temperature dependence of the resistivity is observed upon cooling as compared to K(x)Ru4O8...
April 4, 2016: Inorganic Chemistry
Virgílio Gavicho Uarrota, Rodolfo Moresco, Eder Carlos Schmidt, Zenilda Laurita Bouzon, Eduardo da Costa Nunes, Enilto de Oliveira Neubert, Luiz Augusto Martins Peruch, Miguel Rocha, Marcelo Maraschin
This data article is referred to the research article entitled The role of ascorbate peroxidase, guaiacol peroxidase, and polysaccharides in cassava (Manihot esculenta Crantz) roots under postharvest physiological deterioration by Uarrota et al. (2015). Food Chemistry 197, Part A, 737-746. The stress duo to PPD of cassava roots leads to the formation of ROS which are extremely harmful and accelerates cassava spoiling. To prevent or alleviate injuries from ROS, plants have evolved antioxidant systems that include non-enzymatic and enzymatic defence systems such as ascorbate peroxidase, guaiacol peroxidase and polysaccharides...
March 2016: Data in Brief
Virgílio Gavicho Uarrota, Rodolfo Moresco, Eder Carlos Schmidt, Zenilda Laurita Bouzon, Eduardo da Costa Nunes, Enilto de Oliveira Neubert, Luiz Augusto Martins Peruch, Miguel Rocha, Marcelo Maraschin
This study aimed to investigate the role of ascorbate peroxidase (APX), guaiacol peroxidase (GPX), polysaccharides, and protein contents associated with the early events of postharvest physiological deterioration (PPD) in cassava roots. Increases in APX and GPX activity, as well as total protein contents occurred from 3 to 5 days of storage and were correlated with the delay of PPD. Cassava samples stained with Periodic Acid-Schiff (PAS) highlighted the presence of starch and cellulose. Degradation of starch granules during PPD was also detected...
April 15, 2016: Food Chemistry
Michel D Landry, Laurita M Hack, Elizabeth Coulson, Janet Freburger, Michael P Johnson, Richard Katz, Joanne Kerwin, Megan H Smith, Henry C Bud Wessman, Diana G Venskus, Patricia L Sinnott, Marc Goldstein
BACKGROUND: Health human resources continue to emerge as a critical health policy issue across the United States. OBJECTIVE: The purpose of this study was to develop a strategy for modeling future workforce projections to serve as a basis for analyzing annual supply of and demand for physical therapists across the United States into 2020. DESIGN: A traditional stock-and-flow methodology or model was developed and populated with publicly available data to produce estimates of supply and demand for physical therapists by 2020...
January 2016: Physical Therapy
Michelle M J Nassal, Xiaoping Wan, Kenneth R Laurita, Michael J Cutler
BACKGROUND: Atrial fibrillation (AF) is the most common arrhythmia in humans, yet; treatment has remained sub-optimal due to poor understanding of the underlying mechanisms. Cardiac alternans precede AF episodes, suggesting an important arrhythmia substrate. Recently, we demonstrated ventricular SERCA2a overexpression suppresses cardiac alternans and arrhythmias. Therefore, we hypothesized that atrial SERCA2a overexpression will decrease cardiac alternans and arrhythmias. METHODS: Adult rat isolated atrial myocytes where divided into three treatment groups 1) Control, 2) SERCA2a overexpression (Ad...
2015: PloS One
Paul A Giardina, Matthew J Laurita, Shikhar K Shah
Researchers have attempted to link incidences of papillary thyroid cancer with radioiodine releases from nuclear power plants. Thyroid cancer detection rates are examined together with overall population exposure to ionizing radiation and actual radioiodine releases from the Indian Point Energy Center to determine if a causal relationship exists. A critical review of the statistical analyses used in previous papers is then presented.
September 2015: Health Physics
N J Laurita, J Deisenhofer, LiDong Pan, C M Morris, M Schmidt, M Johnsson, V Tsurkan, A Loidl, N P Armitage
Theoretical models of the spin-orbital liquid (SOL) FeSc2S4 have predicted it to be in close proximity to a quantum critical point separating a spin-orbital liquid phase from a long-range ordered magnetic phase. Here, we examine the magnetic excitations of FeSc2S4 through time-domain terahertz spectroscopy under an applied magnetic field. At low temperatures an excitation emerges that we attribute to a singlet-triplet excitation from the SOL ground state. A threefold splitting of this excitation is observed as a function of applied magnetic field...
May 22, 2015: Physical Review Letters
Camila Francieli da Silva Malone, Janaína Rigonato, Haywood Dail Laughinghouse, Éder Carlos Schmidt, Zenilda Laurita Bouzon, Annick Wilmotte, Marli Fátima Fiore, Célia Leite Sant'Anna
For more than a decade, the taxonomy of the Phormidiaceae has been problematic, since morphologically similar organisms represent phylogenetically distinct entities. Based on 16S rRNA gene sequence analyses, the polyphyletic genus Phormidium and other gas-vacuolated oscillatorioids appear scattered throughout the cyanobacterial tree of life. Recently, several studies have focused on understanding the oscillatorioid taxa at the generic level. At the specific level, few studies have characterized cyanobacterial strains using combined datasets (morphology, ultrastructure and molecular multilocus analyses)...
September 2015: International Journal of Systematic and Evolutionary Microbiology
Daniela Barbieri, Marco Boselli, Francesca Cavrini, Vittorio Colombo, Matteo Gherardi, Maria Paola Landini, Romolo Laurita, Anna Liguori, Augusto Stancampiano
Low power atmospheric pressure inductively coupled thermal plasma sources integrated with a quenching device (cold ICP) for the efficient production of biologically active agents have been recently developed for potential biomedical applications. In the present work, in vitro experiments aimed at assessing the decontamination potential of a cold ICP source were carried out on bacteria typically associated with chronic wounds and designed to represent a realistic wound environment; further in vitro experiments were performed to investigate the effects of plasma-irradiated physiological saline solution on eukaryotic cells viability...
2015: Biointerphases
Bradley N Plummer, Haiyan Liu, Xiaoping Wan, Isabelle Deschênes, Kenneth R Laurita
BACKGROUND: In myocardial infarction (MI), repolarization alternans is a potent arrhythmia substrate that has been linked to Ca2+ cycling proteins, such as sarcoplasmic reticulum Ca2+ ATPase (SERCA2a), located in the sarcoplasmic reticulum. MI is also associated with oxidative stress and increased xanthine oxidase (XO) activity, an important source of reactive oxygen species (ROS) in the sarcoplasmic reticulum that may reduce SERCA2a function. We hypothesize that in chronic MI, XO-mediated oxidation of SERCA2a is a mechanism of cardiac alternans...
February 2015: Circulation. Arrhythmia and Electrophysiology
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