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https://www.readbyqxmd.com/read/28165235/structural-evolution-and-atom-clustering-in-%C3%AE-sialon-%C3%AE-si6-zalzozn8-z
#1
Clayton Cozzan, Kent J Griffith, Geneva Laurita, Jerry G Hu, Clare P Grey, Ram Seshadri
SiAlON ceramics, solid solutions based on the Si3N4 structure, are important, lightweight structural materials with intrinsically high strength, high hardness, and high thermal and chemical stability. Described by the chemical formula β-Si6-zAlzOzN8-z, from a compositional viewpoint, these materials can be regarded as solid solutions between Si3N4 and Al3O3N. A key aspect of the structural evolution with increasing Al and O (z in the formula) is to understand how these elements are distributed on the β-Si3N4 framework...
February 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28123587/analysis-of-molecular-markers-as-predictive-factors-of-lymph-node-involvement-in-breast-carcinoma
#2
Luciana Marques Paula, Luis Henrique Ferreira De Moraes, Abaeté Leite Do Canto, Laurita Dos Santos, Airton Abrahão Martin, Silvia Regina Rogatto, Renata De Azevedo Canevari
Nodal status is the most significant independent prognostic factor in breast cancer. Identification of molecular markers would allow stratification of patients who require surgical assessment of lymph nodes from the large numbers of patients for whom this surgical procedure is unnecessary, thus leading to a more accurate prognosis. However, up to now, the reported studies are preliminary and controversial, and although hundreds of markers have been assessed, few of them have been used in clinical practice for treatment or prognosis in breast cancer...
January 2017: Oncology Letters
https://www.readbyqxmd.com/read/27960141/in-vivo-confocal-raman-spectroscopy-and-molecular-dynamics-analysis-of-penetration-of-retinyl-acetate-into-stratum-corneum
#3
Laurita Dos Santos, Claudio A Téllez S, Mariane P J Sousa, Nuno G Azoia, Artur M Cavaco-Paulo, Airton A Martin, Priscila P Favero
OBJECTIVE: The purpose of this study is to elucidate the behavior of retinyl acetate in penetrating human skin without the presence of enhancers by using confocal Raman spectroscopy and molecular dynamics simulation. METHODS: In this study, in vivo confocal Raman spectroscopy was combined with molecular dynamics simulation to investigate the transdermal permeation of the aqueous suspension of retinyl acetate. RESULTS: Permeation was measured after 30min, and retinyl acetate was found up to 20μm deep inside the stratum corneum...
March 5, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/27935082/improved-separation-and-size-characterization-of-gold-nanoparticles-through-a-novel-capillary-zone-electrophoresis-method-using-poly-sodium4-styrenesulfonate-as-stabiliser-and-a-stepwise-field-strength-gradient
#4
Rosanna Ciriello, Pina Teresa Iallorenzi, Alessandro Laurita, Antonio Guerrieri
A novel Capillary Zone Electrophoresis (CZE) method was developed for an improved separation and size characterization of pristine gold nanoparticles (AuNP) using uncoated fused-silica capillaries with UV-Vis detection at 520 nm. To avoid colloid aggregation and/or adsorption during runs, poly(sodium 4-styrenesulfonate) (PSS) was added (1%, w/v) in the running buffer (CAPS 10 mM, pH 11). This polyelectrolyte conferred an enhanced stabilization to AuNP, both steric and electrostatic, exalting at the same time their differences in electrophoretic mobility...
December 9, 2016: Electrophoresis
https://www.readbyqxmd.com/read/27931874/micro-raman-spectroscopic-study-of-thyroid-tissues
#5
Lázaro Pinto Medeiros Neto, Luis Felipe das Chagas E Silva de Carvalho, Laurita Dos Santos, Cláudio Alberto Tellez Soto, Renata de Azevedo Canevari, André Bandiera de Oliveira Santos, Evandro Sobroza Mello, Marina Aparecida Pereira, Cláudio Roberto Cernea, Lenine Garcia Brandão, Aírton Abrahão Martin
Thyroid carcinomas are the most common endocrine malignancy. Inconclusive results for the analysis of malignancies are an issue in the diagnosis of thyroid carcinomas; 20% of thyroid cancer diagnoses are indeterminate or suspicious, resulting in a surgical procedure without immediate need. The use of Raman spectroscopy may help improve the diagnosis of thyroid carcinoma. In this study, 30 thyroid samples, including normal thyroid, goiter and thyroid cancer, were analyzed by confocal Raman spectroscopy. Principal component analysis (PCA), linear discriminant analysis (LDA) with cross validation and binary logistic regression (BLR) analysis were applied to discriminate among tissues...
December 5, 2016: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/27930774/dft-b3lyp-3-21g-theoretical-insights-on-the-confocal-raman-experimental-observations-in-skin-dermis-of-healthy-young-healthy-elderly-and-diabetic-elderly-women
#6
Claudio Alberto Téllez Soto, Liliane Pereira, Laurita Dos Santos, Ramu Rajasekaran, Priscila Fávero, Airton Abrahão Martin
No abstract text is available yet for this article.
December 1, 2016: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/27862778/reentrant-structural-and-optical-properties-and-large-positive-thermal-expansion-in-perovskite-formamidinium-lead-iodide
#7
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
https://www.readbyqxmd.com/read/27847170/metabolomics-of-ulva-lactuca-linnaeus-chlorophyta-exposed-to-oil-fuels-fourier-transform-infrared-spectroscopy-and-multivariate-analysis-as-tools-for-metabolic-fingerprint
#8
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...
January 30, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/27597260/formation-of-titanium-carbide-tic-and-tic-c-core-shell-nanostructures-by-ultra-short-laser-ablation-of-titanium-carbide-and-metallic-titanium-in-liquid
#9
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)...
March 1, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27583813/dynamic-stereochemical-activity-of-the-sn-2-lone-pair-in-perovskite-cssnbr3
#10
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
https://www.readbyqxmd.com/read/27411080/statistical-strategies-to-reveal-potential-vibrational-markers-for-in-vivo-analysis-by-confocal-raman-spectroscopy
#11
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
https://www.readbyqxmd.com/read/27344495/microvolt-t-wave-alternans-amplifies-spatial-dispersion-of-repolarization-in-human-subjects-with-ischemic-cardiomyopathy
#12
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
https://www.readbyqxmd.com/read/27282336/poly-l-lactic-acid-nanofiber-polyamidoamine-hydrogel-composites-preparation-properties-and-preliminary-evaluation-as-scaffolds-for-human-pluripotent-stem-cell-culturing
#13
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
https://www.readbyqxmd.com/read/27238412/mesenchymal-stem-cells-suppress-cardiac-alternans-by-activation-of-pi3k-mediated-nitroso-redox-pathway
#14
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
https://www.readbyqxmd.com/read/27192480/in%C3%A2-vitro-exposure-of-ulva-lactuca-linnaeus-chlorophyta-to-gasoline-biochemical-and-morphological-alterations
#15
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
https://www.readbyqxmd.com/read/27108785/triterpene-derivative-a-potential-signaling-pathway-for-the-fern-9-11-ene-2%C3%AE-3%C3%AE-diol-on-insulin-secretion-in-pancreatic-islet
#16
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
https://www.readbyqxmd.com/read/26986833/influence-of-structural-disorder-on-hollandites-a-x-ru4o8-a-k-rb-rb-1-x-na-x
#17
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
https://www.readbyqxmd.com/read/26900596/data-supporting-the-role-of-enzymes-and-polysaccharides-during-cassava-postharvest-physiological-deterioration
#18
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
https://www.readbyqxmd.com/read/26617011/the-role-of-ascorbate-peroxidase-guaiacol-peroxidase-and-polysaccharides-in-cassava-manihot-esculenta-crantz-roots-under-postharvest-physiological-deterioration
#19
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
https://www.readbyqxmd.com/read/26472298/workforce-projections-2010-2020-annual-supply-and-demand-forecasting-models-for-physical-therapists-across-the-united-states
#20
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
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