31 research outputs found
Minkowski Solutions of IIB Supergravity
No full textWe classify Minkowski4 solutions of IIB supergravity with an symmetry geometrically realized by an S2-foliation in the remaining six dimensions. For the various cases of the classification, we reduce the supersymmetric system of equations to PDEs. These cases often accommodate systems of intersecting branes and half-maximally supersymmetric AdS5, 6, 7 solutions when they exist. As an example, we analyze the AdS6 case in more detail, reducing the supersymmetry equations to a single cylindrical Laplace equation. We also recover an already known linear dilaton background dual to the (1, 1) Little String Theory (LST) living on NS5-branes, and we find a new Minkowski5 linear dilaton solution from brane intersections. Finally, we also discuss some simple Minkowski4 solutions based on compact conformal Calabi-Yau manifolds
Dynamic tests and modal identification of Corso Grosseto viaduct decks before the dismounting
No full textThis paper describes the dynamic test campaign carried out on four prestressed concrete decks being part of the viaduct of Corso Grosseto in Turin, before its demolition after a service life of 50 years. Subsequently, 25 beams, 4 box girders and 2 pier caps were collected from the tested decks to be deeply investigated within the frame of BRIDGE|50 research project. The purpose of the preliminary test campaign is to characterize the dynamic behavior of the decks in their service condition. Dynamic measurements were acquired on each deck by using different excitation sources. The collected data have been analyzed in order to extract the principal modal components and the outcomes have been compared to the analytical results given by a FE model. The results of the tests will be used to better investigate the effectiveness of the dynamic tests in the assessment of ageing infrastructures, to explore the effects of damages on single beams and its influence on the global response of this bridge typology
Deconstruction of the Corso Grosseto viaduct and setup of a testing site for full scale load tests
No full textBRIDGE|50 is a research project recently launched in Italy in the context of the Torino-Ceres construction works jointly with Politecnico di Milano, Politecnico di Torino, public authorities and private companies. The aim of the BRIDGE|50 research project is to investigate the residual structural performance of the Corso Grosseto 50-year-old prestressed concrete bridge through an experimental campaign. The dismantling and demolition procedures of Corso Grosseto viaduct are presented in this paper, including the setup of the field laboratory where several deck beams and pier caps will be tested up to collapse
Deconstruction of the Corso Grosseto viaduct and setup of a testing site for full scale load tests
No full textBRIDGE|50 is a research project recently launched in Italy in the context of the Torino-Ceres construction works jointly with Politecnico di Milano, Politecnico di Torino, public authorities and private companies. The aim of the BRIDGE|50 research project is to investigate the residual structural performance of the Corso Grosseto 50-year-old prestressed concrete bridge through an experimental campaign. The dismantling and demolition procedures of Corso Grosseto viaduct are presented in this paper, including the setup of the field laboratory where several deck beams and pier caps will be tested up to collapse
Dynamic tests and modal identification of Corso Grosseto viaduct decks before the dismounting
No full textThis paper describes the dynamic test campaign carried out on four prestressed concrete decks being part of the viaduct of Corso Grosseto in Turin, before its demolition after a service life of 50 years. Subsequently, 25 beams, 4 box girders and 2 pier caps were collected from the tested decks to be deeply investigated within the frame of BRIDGE|50 research project. The purpose of the preliminary test campaign is to characterize the dynamic behavior of the decks in their service condition. Dynamic measurements were acquired on each deck by using different excitation sources. The collected data have been analyzed in order to extract the principal modal components and the outcomes have been compared to the analytical results given by a FE model. The results of the tests will be used to better investigate the effectiveness of the dynamic tests in the assessment of ageing infrastructures, to explore the effects of damages on single beams and its influence on the global response of this bridge typology
Kalanchoe gastonis-bonnieri Rayn.-Hamet & H.Perrier e Kalanchoe pinnata Pers. (Crassulaceae): atividade antifúginca e estudo farmacognóstico comparativo
No full textCrassulaceae apresenta interesse para estudos pois atende às diversas abordagens de estudos de prospecção (etológica, quimiotaxonômica e etnodirigida). Pouco se estudou sobre a distinção das espécies de Kalanchoe que podem ser confundidas, contribuindo para o risco de intoxicações. A falta de opções terapêuticas para o tratamento de micoses, o surgimento de cepas resistentes aos medicamentos tradicionais e sua toxicidade indicam a necessidade do estudo de novas substâncias ativas, das quais as plantas historicamente são fornecedoras. Visou-se à caracterização anatômica, histoquímica, físico-química e fitoquímica preliminar de Kalanchoe gastonis-bonnieri e Kalanchoe pinnata para contribuir com sua identificação e avaliar a atividade antifúngica contra cepas ATCC de Candida (C. albicans 90028, C. parapsilosis 22019, C. krusei 6258, C. tropicalis 750 e C. glabrata 90030) e Cryptococcus neoformans 90012). O estudo anatômico revelou grande semelhança entre as plantas, que diferiram quanto à distribuição de compostos fenólicos na nervura central. O parênquima clorofiliano é homogêneo, com epiderme uniestratificada de células tabulares e tricomas glandulares claviformes, bisseriados na cabeça e no pedúnculo. No estudo histoquímico distingue-se K. gastonis-bonnieri de K. pinnata por esta apresentar antocianinas e a primeira apresentar esteroides, ambas apresentaram alcaloides, compostos fenólicos, taninos e terpenoides com grupo carbonila. Na triagem fitoquímica e técnicas cromatográficas, confirmaram-se os resultados da histoquímica e identificou-se glicosídeos cardiotônicos...Crassulaceae is an interesting family to study because it meets the diverse approaches to prospection studies. There are few studies about differences between species of Kalanchoe so they could be confused, increasing the risk of intoxication. In addition, lack of options to treat diseases caused by yeasts and the appearance of species that no longer are susceptible to traditional drugs and toxicity of these drugs suggests that studies are necessary to find new active substances that can be found in plants. Aim of this study was anatomical, histochemical, physical-chemical and phytochemical characterization of Kalanchoe gastonis-bonnieri and Kalanchoe pinnata to contribute with their identification and to evaluate their activity against ATCC strains of Candida (Candida albicans 90028, Candida parapsilosis 22019, Candida krusei 6258, Candida tropicalis 750 and Candida glabrata 90030) and Cryptococcus neoformans 90012. Anatomical study showed great similarity between both Kalanchoe differing in the distribution of the phenolic compounds through the central nerve. Chlorophyllous parenchyma is homogeneous with uniseriate epidermis of tabular cells and glandular trychomas in a club shape and biseriated head and peduncle. K. gastonis-bonnieri showed steroids and K. pinnata antocianins in histochemical study, and both of them showed alcaloids, phenolic compounds, tannins and terpenoids with carbonyl groups. Phytochemical and chromatography studies confirmed the results of histochemistry... (Complete abstract click electronic access below)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES
Kalanchoe gastonis-bonnieri Rayn.-Hamet & H.Perrier e Kalanchoe pinnata Pers. (Crassulaceae): atividade antifúginca e estudo farmacognóstico comparativo
No full textCrassulaceae apresenta interesse para estudos pois atende às diversas abordagens de estudos de prospecção (etológica, quimiotaxonômica e etnodirigida). Pouco se estudou sobre a distinção das espécies de Kalanchoe que podem ser confundidas, contribuindo para o risco de intoxicações. A falta de opções terapêuticas para o tratamento de micoses, o surgimento de cepas resistentes aos medicamentos tradicionais e sua toxicidade indicam a necessidade do estudo de novas substâncias ativas, das quais as plantas historicamente são fornecedoras. Visou-se à caracterização anatômica, histoquímica, físico-química e fitoquímica preliminar de Kalanchoe gastonis-bonnieri e Kalanchoe pinnata para contribuir com sua identificação e avaliar a atividade antifúngica contra cepas ATCC de Candida (C. albicans 90028, C. parapsilosis 22019, C. krusei 6258, C. tropicalis 750 e C. glabrata 90030) e Cryptococcus neoformans 90012). O estudo anatômico revelou grande semelhança entre as plantas, que diferiram quanto à distribuição de compostos fenólicos na nervura central. O parênquima clorofiliano é homogêneo, com epiderme uniestratificada de células tabulares e tricomas glandulares claviformes, bisseriados na cabeça e no pedúnculo. No estudo histoquímico distingue-se K. gastonis-bonnieri de K. pinnata por esta apresentar antocianinas e a primeira apresentar esteroides, ambas apresentaram alcaloides, compostos fenólicos, taninos e terpenoides com grupo carbonila. Na triagem fitoquímica e técnicas cromatográficas, confirmaram-se os resultados da histoquímica e identificou-se glicosídeos cardiotônicos...Crassulaceae is an interesting family to study because it meets the diverse approaches to prospection studies. There are few studies about differences between species of Kalanchoe so they could be confused, increasing the risk of intoxication. In addition, lack of options to treat diseases caused by yeasts and the appearance of species that no longer are susceptible to traditional drugs and toxicity of these drugs suggests that studies are necessary to find new active substances that can be found in plants. Aim of this study was anatomical, histochemical, physical-chemical and phytochemical characterization of Kalanchoe gastonis-bonnieri and Kalanchoe pinnata to contribute with their identification and to evaluate their activity against ATCC strains of Candida (Candida albicans 90028, Candida parapsilosis 22019, Candida krusei 6258, Candida tropicalis 750 and Candida glabrata 90030) and Cryptococcus neoformans 90012. Anatomical study showed great similarity between both Kalanchoe differing in the distribution of the phenolic compounds through the central nerve. Chlorophyllous parenchyma is homogeneous with uniseriate epidermis of tabular cells and glandular trychomas in a club shape and biseriated head and peduncle. K. gastonis-bonnieri showed steroids and K. pinnata antocianins in histochemical study, and both of them showed alcaloids, phenolic compounds, tannins and terpenoids with carbonyl groups. Phytochemical and chromatography studies confirmed the results of histochemistry... (Complete abstract click electronic access below)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES
Resistência adesiva à dentina após clareamento dental
No full textCom a introdução de várias técnicas de clareamento dental, bem como o lançamento de vários agentes clareadores em diferentes concentrações e formas de ativação (química e física), se faz necessária a investigação de sua ação sobre as estruturas dentais. Assim, o objetivo desse estudo foi testar as hipóteses de que a técnica de clareamento dental com peróxido de hidrogênio a 35% (Whiteness HP) diminui a resistência adesiva à dentina dos sistemas adesivos convencionais contendo como solvente acetona (Prime & Bond NT) ou água e etanol (Single Bond) e do sistema adesivo autocondicionante (Clearfil SE Bond) e que após sete dias do clareamento os valores de resistência adesiva à dentina humana retornam aos valores dos dentes não submetidos a clareamento. Foram confeccionados 162 espécimes, divididos em 9 grupos: GRUPO 1- (controle) - sistema adesivo convencional Prime & Bond NT. GRUPO 2- (controle) - sistema adesivo convencional Single Bond; GRUPO 3- (controle) - sistema adesivo autocondicionante Clearfil SE Bond; GRUPO 4 - clareamento com Whiteness HP e adesão imediata com sistema adesivo convencional Prime & Bond NT; GRUPO 5 - clareamento com Whiteness HP e adesão imediata com sistema adesivo convencional Single Bond; GRUPO 6 - clareamento com Whiteness HP e adesão imediata com sistema adesivo autocondicionante Clearfil SE Bond; GRUPO 7 - clareamento com Whiteness HP; armazenamento em estufa a 37°C durante 7 dias e sistema adesivo Prime & Bond NT GRUPO 8 - clareamento dental com Whiteness HP; armazenamento em estufa a 37% durante 7 dias e sistema adesivo convencional Single Bond; GRUPO 9 - clareamento com Whiteness HP; armazenamento em estufa a 37% durante 7 dias e sistema adesivo autocondicionante Clearfil SE Bond. Todos os dentes foram restaurados com resina composta TPH e submetidos ao teste de microtração à velocidade de 1.0 mm/min em uma máquina de ensaios universal (Emic, Brasil). As médias e respectivos desvios - padrão para cada grupo foram: G1-25.73 ±3.84; G2- 24.26 ±3.78; G3- 30.95 ±5.02; G4- 23.81 ±6.68; G5- 23.60 ±5.88; G6-28.85 ±3.81; G7- 32.69 ± 8.06; G8- 25.86 ±6.16; G9- 27.45 ±8.97. Após análise estatística pelos testes ANOVA a um critério e Tukey , para comparações individuais, foi possível concluir que a técnica de clareamento dental com o peróxido de hidrogênio a 35% promoveu uma diminuição da resistência adesiva à dentina do sistema adesivo que apresenta acetona como solvente (Prime & Bond NT), sendo que os valores de resistência adesiva foram recuperados sete dias após o clareamento dental; a técnica de clareamento dental com o peróxido de hidrogênio a 35% não alterou a resistência adesiva à dentina do sistema adesivo que apresenta água e etanol como solvente (Single Bond) e para o sistema adesivo autocondicionante (Clearfil SE Bond).The aim of this study was to evaluate the effect of a bleaching agent and the influence of delaying the bonding procedures on bond strength to human dentin using different adhesive systems. The first hypothesis to test was that the bleaching technique with 35% hydrogen peroxide (Whiteness HP) decreases the bond strength to dentin when two conventional adhesive systems (an acetone-based - Prime&Bond NT (PB); a water/ ethanol based - Single Bond (SB)) and a self- etching system (Clearfil SE Bond (SE) are applied. The second hypothesis was that there is no difference in bond strength values 7 days after bleaching. Thirty six specimens were prepared and divided into 9 groups: G1- PB (control), G2- SB (control); G3- SE (control), G4- Whiteness HP (HP) + immediate bonding procedure with PB, G5- HP + immediate bonding with SB, G6- HP + immediate bonding with SE, G7- HP + storage at 37oC for 7 days + PB, G8- HP + storage at 37o C for 7 days + SB, G9- HP + storage at 37oC for 7 days + SE. After bonding agent application, all teeth were restored with resin composite TPH and submitted to microtensile test in a Universal Testing Machine (Emic, Brazil) at a crosshead speed of 1mm/ min. Data were analyzed by ANOVA and Tukey tests (5%). The mean values (MPa) and standard deviation for each group was: G1- 25.73 ± 3.84; G2- 24.26 ± 3.78, G3- 30.95 ± 5.02, G4-23.81 ± 6.68, G5- 23.60 ± 5.88, G6- 28.85 ± 3.81, G7- 32.69 ± 8.06, G8- 25.86 ± 6.16, G9- 27.45 ± 8.97. It can be concluded that the bleaching technique using 35% hydrogen peroxide decreased the bond strength to dentin when acetonebased system (PB) was applied. However, the bond strength mean values were reversed 7 days after bleaching. There was no influence of 35% hydrogen peroxide bleaching treatment on bond strength when SB (water/ ethanol based) and SE (self- etching) were used
Kalanchoe gastonis-bonnieri Rayn.-Hamet & H.Perrier e Kalanchoe pinnata Pers. (Crassulaceae): atividade antifúginca e estudo farmacognóstico comparativo
No full textCrassulaceae apresenta interesse para estudos pois atende às diversas abordagens de estudos de prospecção (etológica, quimiotaxonômica e etnodirigida). Pouco se estudou sobre a distinção das espécies de Kalanchoe que podem ser confundidas, contribuindo para o risco de intoxicações. A falta de opções terapêuticas para o tratamento de micoses, o surgimento de cepas resistentes aos medicamentos tradicionais e sua toxicidade indicam a necessidade do estudo de novas substâncias ativas, das quais as plantas historicamente são fornecedoras. Visou-se à caracterização anatômica, histoquímica, físico-química e fitoquímica preliminar de Kalanchoe gastonis-bonnieri e Kalanchoe pinnata para contribuir com sua identificação e avaliar a atividade antifúngica contra cepas ATCC de Candida (C. albicans 90028, C. parapsilosis 22019, C. krusei 6258, C. tropicalis 750 e C. glabrata 90030) e Cryptococcus neoformans 90012). O estudo anatômico revelou grande semelhança entre as plantas, que diferiram quanto à distribuição de compostos fenólicos na nervura central. O parênquima clorofiliano é homogêneo, com epiderme uniestratificada de células tabulares e tricomas glandulares claviformes, bisseriados na cabeça e no pedúnculo. No estudo histoquímico distingue-se K. gastonis-bonnieri de K. pinnata por esta apresentar antocianinas e a primeira apresentar esteroides, ambas apresentaram alcaloides, compostos fenólicos, taninos e terpenoides com grupo carbonila. Na triagem fitoquímica e técnicas cromatográficas, confirmaram-se os resultados da histoquímica e identificou-se glicosídeos cardiotônicos...Crassulaceae is an interesting family to study because it meets the diverse approaches to prospection studies. There are few studies about differences between species of Kalanchoe so they could be confused, increasing the risk of intoxication. In addition, lack of options to treat diseases caused by yeasts and the appearance of species that no longer are susceptible to traditional drugs and toxicity of these drugs suggests that studies are necessary to find new active substances that can be found in plants. Aim of this study was anatomical, histochemical, physical-chemical and phytochemical characterization of Kalanchoe gastonis-bonnieri and Kalanchoe pinnata to contribute with their identification and to evaluate their activity against ATCC strains of Candida (Candida albicans 90028, Candida parapsilosis 22019, Candida krusei 6258, Candida tropicalis 750 and Candida glabrata 90030) and Cryptococcus neoformans 90012. Anatomical study showed great similarity between both Kalanchoe differing in the distribution of the phenolic compounds through the central nerve. Chlorophyllous parenchyma is homogeneous with uniseriate epidermis of tabular cells and glandular trychomas in a club shape and biseriated head and peduncle. K. gastonis-bonnieri showed steroids and K. pinnata antocianins in histochemical study, and both of them showed alcaloids, phenolic compounds, tannins and terpenoids with carbonyl groups. Phytochemical and chromatography studies confirmed the results of histochemistry... (Complete abstract click electronic access below)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Universidade Estadual Paulista (UNESP
Evaluating the Effects of an Ophthalmic Solution of Coenzyme Q10 and Vitamin E in Open-Angle Glaucoma Patients. A Study Protocol
No full textIntroduction: The CoQun® study is a multicenter, controlled trial aimed to evaluate the neuroprotective effects of Coqun®, an ophthalmic solution of Coenzyme q10 (CoQ10) and Vitamin E (VitE), in patients affected by primary open-angle glaucoma (POAG). Pre-clinical studies and small non-controlled clinical trials have previously shown a potential role of CoQ10 and VitE in glaucoma neuroprotection, both in vitro and in vivo. Methods: Randomized, parallel arm, multicenter, double-blind study. POAG patients with an IOP ranging from 17 to 21 mm Hg on monotherapy with a prostaglandin analogue (PGA) will be considered for study enrollment. Inclusion criteria will be visual field (VF) mean deviation between − 4 and − 10 dB and VF Pattern Standard Deviation between 4 and 10 dB. Eligible patients will be randomized to receive CoQun® (Arm A) or placebo (Arm B), in addition to PGA monotherapy. Planned Outcomes: Primary outcome will be time to progression, defined as the time between the baseline visit and the visit with confirmed VF progression. A total of 612 patients are planned to be enrolled, to detect a hazard ratio of 0.65, with a power of 80% and an alpha error of 0.05 (two-sided). For study power calculation, 10% non-evaluable patients are assumed. This is the first study investigating, in a randomized, double-blind and controlled fashion, the neuroprotective effects of CoQ10 and VitE in POAG patients. Trial Registration: ClinicalTrials.gov identifier, NCT03611530
