Bernardi A.C.C.,Embrapa Pecuaria Sudeste Soil Fertility |
Mota E.P.,University of Sao Paulo |
Cardosa R.D.,UNICASTELO |
Monte M.B.M.,CETEM |
Oliveira P.P.A.,Embrapa Pecuaria Sudeste
Communications in Soil Science and Plant Analysis | Year: 2014
Nitrogen (N) loss by ammonia (NH3) volatilization is the main factor for poor efficiency of urea fertilizer applied to the soil surface. Losses can be suppressed by addition of zeolite minerals to urea fertilizer. The objective of this study was to evaluate ammonia volatilization from soil and dry-matter yield and nitrogen levels of Italian ryegrass. A greenhouse experiment was carried out with the treatments of urea, urea incorporated into soil, urea + urease inhibitor, urea + zeolite, ammonium nitrate, and unfertilized treatment. Ammonia was captured by a foam absorber with a polytetrafluoroethylene tape. There were few differences between zeolite and urease inhibitor amendments concerning NH3 volatilization from urea. Results indicate that zeolite minerals have the potential to improve the N-use efficiency and contributed to increasing N uptake. Zeolite and urea mixture reduced 50% the losses by volatilization observed with urea. © 2014 Taylor and Francis Group, LLC.
Chiarelli-Neto O.,University of Sao Paulo |
Pavani C.,University of Sao Paulo |
S. Ferreira A.,University of Sao Paulo |
Uchoa A.F.,Unicastelo |
And 2 more authors.
Free Radical Biology and Medicine | Year: 2011
We have studied the spectroscopic properties of hair (white, blond, red, brown, and black) under illumination with visible light, giving special emphasis to the photoinduced generation of singlet oxygen ( 1O 2). Irradiation of hair shafts (λ ex > 400 nm) changed their properties by degrading the melanin. Formation of C3 hydroperoxides in the melanin indol groups was proven by 1H NMR. After 532-nm excitation, all hair shafts presented the characteristic 1O 2 emission (λ em = 1270 nm), whose intensity varied inversely with the melanin content. 1O 2 lifetime was also shown to vary with hair type, being five times shorter in black hair than in blond hair, indicating the role of melanin as a 1O 2 suppressor. Lifetime ranged from tenths of a nanosecond to a few microseconds, which is much shorter than the lifetime expected for 1O 2 in the solvents in which the hair shafts were suspended, indicating that 1O 2 is generated and suppressed inside the hair structure. Both eumelanin and pheomelanin were shown to produce and to suppress 1O 2, with similar efficiencies. The higher amount of 1O 2 generated in blond hair and its longer lifetime is compatible with the stronger damage that light exposure causes in blond hair. We propose a model to explain the formation and suppression of 1O 2 in hair by photosensitization of melanin with visible light and the deleterious effects that an excess of visible light may cause in hair and skin. © 2011 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
PubMed | Unicastelo, National University of La Plata, Brooklyn College, Brazilian Nuclear Energy Research Institute (IPEN) and 3 more.
Type: | Journal: Photochemistry and photobiology | Year: 2017
Here, ten guidelines are presented for a standardized definition of type I and II photosensitized oxidation reactions. Because of varied notions of reactions mediated by photosensitizers, a checklist of recommendations is provided for their definitions. Type I and type II photoreactions are oxygen-dependent and involve unstable species such as the initial formation of radical cation or neutral radicals from the substrates and/or singlet oxygen (
PubMed | Sao Leopoldo Mandic Institute and Research Center and Unicastelo
Type: Journal Article | Journal: European journal of dentistry | Year: 2014
The aim of this study was to evaluate in vitro the effect of photodynamic therapy (PDT) using LASER or light emitting diode (LED) on cariogenic bacteria (Streptococcus mutans [SM] and Lactobacillus casei [LC]) in bovine dentin.Twenty five fragments of dentin were contaminated with SM and LC strands and divided into five experimental groups according to the therapy they received (n = 5): C - control (no treatment), SCLED - no dye/LED application (94 J/cm(2)), SCLASER - no dye/LASER application (94 J/cm(2)), CCLED - dye/LED application (94 J/cm(2)) and CCLASER - dye/LASER application (94 J/cm(2)). The dye used was methylene blue at 10 mM. Dentin scrapes were harvested from each fragment and prepared for counts of colony forming units (CFU)/mL. The data were analyzed using Kruskal-Wallis, followed by Student-Newman-Keuls ( =0.05).Regarding SM, groups CCLASER and CCLED showed a significant reduction in CFU/mL, which was statistically superior to the SCLASER, SCLED and C groups. Regarding LC, the groups CCLASER and CCLED caused a significant reduction in CFU/mL when compared with SCLASER, which showed intermediate values. SCLED and C had a lesser effect on reducing CFU/mL, where the former showed values similar to those of SCLASER.In conclusion, PDT combined with LASER or LED and methylene blue had a significant antimicrobial effect on cariogenic bacteria in the dentin.
Vanzela L.S.,UNICASTELO |
Grecco D.L.G.,Fernandopolis SP |
Da Costa Neto J.N.,Fernandopolis SP |
Santos G.O.,São Paulo State University
Engenharia Agricola | Year: 2014
The siltation is a natural process, but can be accelerated by human actions and results in major problems for the reservoirs, reducing its useful volume for irrigation. An example of this problem was the reduction of the area of mirror water of Fernandópolis municipal dam in 48.3% during 20 years. Therefore, this study aimed to evaluate the production of sediments and siltation of Fernandópolis municipal dam from a methodology that can be applied to small earth dams for agricultural purposes. For this, it was monitored, monthly throughout the year, the volume of sediment deposited in the reservoir. The percentage of retention sediment in Fernandópolis municipal dam ranged from 53.9 to 94.5%, that associated with a high specific sediment yield, will cause its full silting in at most 57 years. It is recommended to minimize this process the restoration of permanent preservation areas and the removal of 17,500 m3 of sediment from the riverbed of the dam.
Aparecido C.F.F.,UNICASTELO |
Vanzela L.S.,Campus de FernandopolisSP |
Vazquez G.H.,Campus de FernandopolisSP |
Lima R.C.,São Paulo State University
IRRIGA | Year: 2016
Studies on the use and occupation of soil explored by various segments of urban, rural and industrial societies, associated to the watershed characteristics are extremely important for water resources management and sustainability. Therefore, this work aimed to evaluate the influence of different managements of soil use and occupation associated to declivity and superficial flow water resources of watersheds located in Triângulo Mineiro – MG. The study was conducted by monitoring the flow and sediment in 4 basins from September 2013 to October 2014, besides the determination of soil use and occupation, declivity and superficial flow during this time. The obtained mathematical models showed that the ratio of the different soil uses and occupations interferes with the specific production and sediment concentration and the specific flow of watersheds as well, while the amount of superficial flow interferes with the specific sediment production. The simulations results of the management of watersheds’ use and occupation showed that the conservation of native forests, the conservationist techniques of soil use and the minimization techniques of diffuse transport from urban areas are essential for keeping water availability and quality. © 2016, Universidade Estadual Paulista - UNESP. All rights reserved.
Correia N.M.,São Paulo State University |
Leite M.B.,São Paulo State University |
Bioscience Journal | Year: 2013
This work aimed to study the intercropping of corn and Urochloa ruziziensis cv. Common, regarding to vegetative growth and corn yield, capacity of production of forage dry matter, the infestation of weeds and the effect of this system of production in the soybean crop in rotation. Two forms of sowing (hand-sowing and on-line sowing) of U. ruziziensis, four amounts of seeds (200, 400, 600 e 800 points of cultural value, PCV = quantities of seeds x cultural value) and one treatment additional with the single corn were studied. The intercropping did not affect negatively the vegetative growth and corn yield when compared to the single corn. The sowing of 200 PCV of U. ruziziensis seeds, hand-sowed and on-line sowed to 22 days after of sowing of the corn was enough for the maintenance of adequate amount of straw on the soil. At the moment of the harvest of the corn, the dry matter of weed reduced with the increase of the amount of U. ruziziensis seeds and was bigger when the forager was hand-sowed. In the soybean crop in rotation, the density and dry matter of weed reduced linearly with the increase of the amount of U. ruziziensis seeds used in the first year of the research. The intercropping of corn and U. ruziziensis in the first year of the experiment benefited the plants population, plants height and yield of soybean when compared to the monoculture of corn in the same period.
Vanzela L.S.,UNICASTELO |
Hernandez F.B.T.,São Paulo State University |
Franco R.A.M.,São Paulo State University
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2010
Land occupation and its use have a remarkable influence on the superficial water flow and the carrying of sediments to the riverbed and may change the quality and availability of water. The current study aimed to check the influence of the land occupation and use on the Três Barras stream resources, in Marinópolis, SP, Brazil. To check this influence, an analysis of Pearsońs correlation between the parameters of quality and availability and use of water and land was developed. The samples covered the period of January, 2006 until December, 2007. It may be concluded that areas occupied by forests and pastures (in less intensity) favoured the availability and quality of water of the watershed. The inhabited areas and those used for agriculture, and the degraded forests in general, reduced the availability and quality of water in the watershed.
Coimbra E.C.,UNICASTELO |
Vazquez G.H.,São Paulo State University |
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2014
The objective of this research was to test methods of breaking dormancy, besides to assess the efficiency of fungicide in storage of teak diaspores which suffered pre-germination treatments. The experimental design was in completely randomized factorial scheme 7 × 2 × 2 (seven methods of dormancy breaking, with and without fungicide; two stages of evaluation , zero and after 120 days). The methods employed were: immersion in running water (24 h) and in hot water (85-90 °C for 8 min); scarification with sandpaper + immersion in standing water (48 h); scarification with sulfuric acid for 15 min + running water washing (72 h); heating in oven at 80 °C (4 h for 3 days) + standing water immersion (12 h); solarization for 48 hours + standing water immersion (12 h); and the control. The methods of dormancy breaking with dry heating of the teak fruits were able to shorten, increase, and standardize the germination, being the use of the solar collector a good choice for not consuming energy and of low cost. The use of Fludioxonil + Metalaxyl-M fungicide and the storage of teak diaspores which have suffered dormancy breaking treatment are not recommended. © 2014, Departamento de Engenharia Agricola - UFCG/Cnpq. All rights reserved.
Peres A.R.,UNICASTELO |
Vazquez G.H.,UNICASTELO |
Revista Brasileira de Sementes | Year: 2012
The effect of mixture of seeds of Brachiaria brizantha, cv. Marandu, with different sources, granulometry, and phosphatic fertilizer doses during various periods of exposure on the physiological potential of the seeds has been assessed. The treatments consisted in seed exposure during periods of 0, 3, 6, 12, 24, 36, 48, 72, 96, and 120 h to the following fertilizers: ground granulated single superphosphate (SS), and powdered (SSp); and ground granulated ammonium monophosphate (AMP), at doses of 40 and 80 kg P 2O 5 ha -1. Tests of germination, tetrazolium, moisture content, and vigor (first count, electrical conductivity, emergence, emergence speed, and fresh mass of seedlings) were performed. It has been concluded that seed physiological potential of B. brizantha cv. Marandu is reduced with increase on the exposure period to phosphatic fertilizer. Such effect, however, is dependent on the product source, granulometry, and dose. SSp was the most harmful to seeds, followed by SSp and AMP, respectively. Moreover, considering a 60% germination rate as acceptable, it may be inferred that seeds can be kept in contact with AMP and SSp, in dose of 80 kg of P 2O 5 ha -1, respectively, for periods of 71.2 and 16.2 hours.