170,050 research outputs found
Recensione a: Caliman, G. – Oliveira De Vasconcelos, I.C. (2016), Juventude universitaria: Percepções sobre Justiça e Direitos Humanos, Brasilia DF, UNESCO, pp. 206
No full textRecensione a: Caliman, G. – Oliveira De Vasconcelos, I.C. (2016), Juventude universitaria: Percepções sobre Justiça e Direitos Humanos, Brasilia DF, UNESCO, pp. 206
Spatial Autoregressive Models for House Price Dynamics in Italy
No full textThis paper elaborates a Spatial Autoregressive and Spatial Error Model (SAR-SE Model) to investigate the Italian house price dynamics. House prices in real terms have been modelled for the period 1995-2008 in all the 103 Italian provinces along with affordability ratio, persistency term, some social-economic variables and credit market variables. One of the key results of this paper, is the evidence on house price spatial autocorrelation, verified through the Baltagi, Song and Koh (2003) LM test. On the contrary, no evidence of housing price overvaluation has been found, in comparison with the fundamental values determined by interest rates, households income, rents, employment and construction cost.house prices, fundamentals, mean reversion, serial correlation, spatial dependence
Polyethylene glycol effects on somatic embryogenesis of papaya hybrid UENF/CALIMAN 01 seeds
No full textAmong commercial fruits, papaya (Carica papaya L.) is notably one of the most common ones around the world. The aim of the current study was to establish a somatic embryogenesis protocol for the hybrid UENF/CALIMAN 01, elucidating the effects of sucrose and 2,4-dichlorophenoxyacetic acid (2,4-D) on the induction of embryogenic cultures and the effect of polyethylene glycol (PEG) on somatic embryo maturation. Immature zygotic embryos of C. papaya hybrid UENF/CALIMAN 01 were cultured in MS culture medium supplemented with different concentrations of sucrose (30 and 60 g L-1) and 2,4-D (0, 20, 40 and 80 μM). The combination of 30 g L-1 sucrose and 20 μM 2,4-D resulted in the highest induction rates and the largest callus diameters. Furthermore, this combination was associated with the greatest potential to form somatic embryos. To promote maturation, cultures were inoculated in MS medium and exposed to different concentrations of PEG (0, 30 and 60 g L-1). The 60 g L-1 PEG treatment group had the highest average for the number, maturation and conversion of somatic embryos that resulted in plantlets at the end of the process. The addition of PEG to MS medium led to increased protein synthesis. These results are unprecedented for C. papaya hybrid UENF/CALIMAN 01 as the current study demonstrates the development of somatic embryogenesis in this high quality hybrid
Efeito da tiroxina e do hormônio folículo estimulante no desenvolvimento in vitro de folículos pré-antrais ovinos.
No full textO presente experimento foi desenvolvido a fim de se verificar o efeito da tiroxina na presença ou ausência do hormônio folículo estimulante (FSH) sobre a sobrevivência e o crescimento de folículos pré-antrais de ovinos. Fragmentos de tecido ovariano foram cultivados por 1 e 7 dias em meio essencial mínimo (?-MEM+) suplementado ou não com diferentes concentrações de tiroxina (10, 20, 50 µg/mL) na presença ou ausência de rFSH (50 ng/mL). O tecido ovariano não-cultivado (controle fresco) e os fragmentos cultivados no dia 1 e 7 nos diferentes tratamentos foram processados e analisados utilizando a técnica de histologia clássica. Quando os dias de cultivo foram comparados ao controle não-cultivado, somente no dia 1 foi verificado que os tratamentos contendo ?- MEM+, FSH, T20 e T50 mostraram percentuais de sobrevivência folicular semelhantes ao controle. Quando os tratamentos foram comparados entre si dentro de cada período de cultivo, foi observado que apenas no dia 7, o tratamento contendo T50 apresentou um percentual de folículos normais superior ao tratamento T10F. Com relação ao diâmetro folicular, não houve crescimento dos folículos em cultivo, uma vez que todos os tratamentos comportaram-se de maneira semelhante ao controle não-cultivado e ao ?- MEM+, exceto o tratamento T10. Ao se comparar os tratamentos, dentro de cada período de cultivo, foi observado que no dia 1 os tratamentos T50, T10F e T50F apresentaram diâmetro folicular superior quando comparados ao tratamento T10. Semelhante ao crescimento folicular também não houve crescimento oocitário. Para o diâmetro oocitário, no dia 1, foi verificada uma redução para os tratamentos T10 e T20F quando comparados ao não cultivado. Já no dia 7 de cultivo os tratamentos FSH, T10F e T50F reduziram o diâmetro oocitário, com a progressão do cultivo do dia 1 para o dia 7 e ainda quando comparados ao controle não-cultivado e ao ?-MEM+. Concluiu-se que altas concentrações de T4 (50 ?g/ml) proporcionaram resultados promissores no que diz respeito à sobrevivência e desenvolvimento folicular in vitro. Quanto a associação da T4 com o FSH não demonstrou resultados positivos na sobrevivência e no desenvolvimento folicular in vitro. Embora seja conhecida a atuação da tiroxina na fisiologia ovariana são necessárias mais pesquisas que verifiquem sua importância para o desenvolvimento in vitro de folículos pré-antrais ovinos. [Effects of thyroxin and follicle stimulating hormone on the in vitro development of ovine preantral follicles]. Abstract - This experiment has been developed in order to verify the thyroxine effect in the presence or absence of follicle stimulating hormone (FSH) on survival and growth of sheep preantral follicles. Fragments of ovarian tissue were grown for 1 or 7 days in a situation with a minimum essential (?-MEM +) alone or containing thyroxine (10, 20, 50 µg/mL) in the presence or absence of rFSH (50 ng/mL). The ovarian tissue non-grown (fresh control) and grown in different treatments were processed for analysis using the classical histology technique. When the days of culture were compared to the non-cultivated control, on the first day was found that the treatment with ?-MEM+, FSH, T20 and T50 showed follicular survival percentages similar to control. When the treatments have been compared between each other within the growing season was identified that only on the 7th day, the treatment containing T50 presents a percentage of normal follicles significantly superior to the treatment with T10F. Related to the follicular diameter, the follicle in culture has not grown, since all treatments have had a similar behavior when controlling non-grown and ?- MEM+, except the T10 treatment. When comparing the treatments within each growing season, it has been observed that on the first day, treatments T50, T10F and T50F have showed a follicular diameter greater when compared to T10 treatment. Similar to what happenedto follicular growth, oocitário growth has not grown either. For oocitário diameter, on the first day, there was a reduction for T10 and T20F treatments when compared to non-grown. On the 7th day of grown, FSH, T10F and T50F treatments have reduced oocitário diameter, with a progression of culture from the first day to the 7th one and even when compared to control non-grown and ?-MEM+. It was concluded that high T4 concentrations (50 g / ml) have provided promising about the survival and follicular development in vitro. The association of T4 with FSH, have not presented positive results in the survival and follicular development in vitro. Although it is known the thyroxine action on ovarian physiology, there is a need to verify its importance for the in vitro development of preantral sheep follicles.Dissertação (Mestrado em Medicina Veterinária) - Universidade Federal de Viçosa, Viçosa, MG. Orientador: Eduardo Paulino da Costa; Co-Orientador: Laércio dos Anjos Benjamin, Co-Orientador: Jeferson Ferreira da Fonseca, Embrapa Caprinos e Ovinos (CNPC); Co-Orientador: José Domingos Guimarães
Monitoring of the genetic variability in papaya parent ‘Formosa’ of ‘UENF/CALIMAN 01’ hybrid via RAPD
No full textThe genetic improvement of papaya in Brazil, in hybridizations and studies of combining ability, can broaden the genetic base of the species and brush aside the constraints in choosing cultivars for planting. The objective of this study was to monitor the advance of elfing generations in the parent Formosa of ‘UENF/CALIMAN 01", the first Brazilian papaya hybrid, using RAPD markers. For this urpose 27, 30 and 31 plants of the C; Cy and C; cycles, respectively, were genotyped. The coefficients of mean genetic dissimilarity were 0.1766, 0.0555 and 0.0445 in the C, Cyand C; cycles, respectively. The reduced mean distance in the C;cycle indicates a greater genetic homogeneity of these plants, fulfilling a basic requirement for the creation of uniform hybrids. The establishment of the C ,cycle would herefore achieve no significant gains in reducing the genetic distance but cause a delay in the release of hybrid seeds
Pós-colheita de mamão híbrido UENF/CALIMAN 01 cultivado no Rio Grande do Norte Postharvest shelf life of papaya UENF/CALIMAN 01 produced in Rio Grande do Norte
No full textNo Brasil, foi desenvolvido um novo híbrido de mamão obtido através de melhoramento do cruzamento entre um progenitor do Grupo Formosa e um progenitor do Grupo Solo. Recentemente, os produtores de mamões do Rio Grande do Norte introduziram o cultivo desse híbrido em seus pomares: no entanto, os estudos acerca do potencial de conservação desses frutos restringem-se aos testes realizados nas próprias empresas. O presente trabalho propôs-se a avaliar a vida útil pós-colheita do mamão híbrido UENF/Caliman 01 cultivado no Estado do Rio Grande do Norte. Os frutos foram provenientes de um plantio comercial, localizado no município de Ceará-Mirim-RN. Os mamões foram colhidos no estádio de maturação I (menos de 15% da superfície da casca amarela). No galpão de embalagem, os frutos passaram por lavagem, seleção, tratamentos hidrotérmico, imersão em fungicida e cera. No laboratório da Universidade Federal Rural do Semi-Árido (Mossoró-RN), os frutos foram armazenados à temperatura de 25º C ± 2º C e umidade relativa de 55% ± 5%. Aos 0; 2; 4; 6; 8 e 10 dias de armazenamento, realizaram-se avaliações sobre as seguintes variáveis: aparência externa e interna, coloração da casca, perda de massa, firmeza, sólidos solúveis, acidez titulável, pH e açúcares. Esse híbrido apresenta características fenotípicas do Grupo Formosa, com frutos alongados, massa média de 1,28 kg, polpa com espessura de 2,74 cm, coloração vermelha e conteúdo elevado de sólidos solúveis (13,65%) e açúcares (10,53%). As variáveis de qualidade analisadas limitaram a vida útil pós-colheita do híbrido UENF/Caliman 01 em oito dias.A new papaya hybrid was developed in Brazil obtained by breeding with the crossing of progenitors from Solo x Formosa groups. Recently, in the state of Rio Grande do Norte, Brazil, this hybrid was introduced by the farmers in their orchards. However, the studies concerning to the conservation potential of these fruits was limited to the tests accomplished in commercial farms. This work purpose was to evaluate the hybrid UENF/Caliman shelf life produced in the state of Rio Grande Norte. Fruit were harvested at physiological maturity, packaged and transported to the Semi-arid Federal Rural University laboratory, in Mossoró City, state of Rio Grande do Norte . Fruits were stored at 25 ºC (±2) and 55 % (± 5) of relative humidity for 0, 2, 4, 6, 8 and 10 days. The experiment was completely randomized with 6 treatments. Were evaluated the variables: mass loss, external appearance, firmness, pulp color, titratable acidity, pH, soluble solids and total soluble sugars. The hybrid presents phenotypic characteristics of the 'Formosa' papaya group, with elongated fruits, 1,28 kg of medium mass, 2,74 cm of pulp thickness, red coloration of the pulp, high content of soluble solids (13,65%) and sugars (10,53%). The quality variables analyzed limited at postharvest shelf life of the hybrid UENF/Caliman 01 to eight days
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Mitomycin C in highly myopic eyes - Author reply
No full textOphthalmology. 2005 Feb;112(2):208-18; discussion 219.
Mitomycin C modulation of corneal wound healing after photorefractive keratectomy in highly myopic eyes.
Gambato C, Ghirlando A, Moretto E, Busato F, Midena E.
SourceRefractive Surgery Service and Antimetabolite Therapy Research Unit, Department of Ophthalmology, University of Padova, Padova, Italy.
Abstract
PURPOSE: To evaluate the role of topical mitomycin C in corneal wound healing (CWH) after photorefractive keratectomy (PRK) in highly myopic eyes.
DESIGN: Prospective, double-masked, randomized clinical trial.
PARTICIPANTS: Seventy-two eyes of 36 patients affected by high (>7 diopters) myopia.
METHODS: In each patient, one eye was randomly assigned to PRK with intraoperative topical 0.02% mitomycin C application, and the fellow eye was treated with a placebo. Postoperatively, mitomycin C-treated eyes received artificial tears (3 times daily, tapered in 3 months), whereas the fellow eye was treated with fluorometholone sodium 2% and artificial tears (3 times daily, tapered in 3 months).
MAIN OUTCOME MEASURES: Uncorrected visual acuity (UCVA) and best-corrected visual acuity (BCVA), contrast sensitivity, manifest refraction, and biomicroscopy. Contrast sensitivity was determined using the Pelli-Robson chart. Corneal confocal microscopy documented CWH.
RESULTS: Mean follow-up was 18 months (range, 12-36). No side effects or toxic effects were documented. At 12-month follow-up examination, UCVAs (logarithm of the minimum angle of resolution) were 0.4+/-0.48 and 0.5+/-0.53 (P = .03) in mitomycin C-treated eyes and corticosteroid-treated eyes, respectively. At 1 year, corneal haze developed in 20% of corticosteroid-treated eyes, versus 0% of mitomycin C-treated eyes. At 12, 24, and 36 months, corneal confocal microscopy showed activated keratocytes and extracellular matrix significantly more evident in untreated eyes (Ps = 0.004, 0.024, and 0.046, respectively).
CONCLUSION: Topical intraoperative application of 0.02% mitomycin C can reduce haze formation in highly myopic eyes undergoing PRK.
Comment in
Ophthalmology. 2006 Feb;113(2):357; author reply 357-8
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
A Multi-Language Comparison of Influences on Author Verification using Character N-Grams
No full textWe create a new multi-language corpus for author verification based on Wikipedia talkpages, and evaluate the influence that differences in topic and time have on character n-gram author profiles. Topic alignment between two texts is found to increase author verification precision, and an authors writing style is found to change over time, but not more significantly after 3 years than after 1 year.Information ArchitectureWISElectrical Engineering, Mathematics and Computer Scienc
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