oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

4 ( 1 )

2019 ( 48 )

2018 ( 340 )

2017 ( 332 )

Custom range...

Search Results: 1 - 10 of 194519 matches for " Wagner F. da;Finger "
All listed articles are free for downloading (OA Articles)
Page 1 /194519
Display every page Item
Conserva??o e qualidade pós-colheita de quiabo sob diferentes temperaturas e formas de armazenamento
Mota, Wagner F da;Finger, Fernando Luiz;Cecon, Paulo Roberto;Silva, Derly José H da;Corrêa, Paulo César;Firme, Lúcia P;Mizobutsi, Gisele P;
Horticultura Brasileira , 2010, DOI: 10.1590/S0102-05362010000100003
Abstract: this work had the goal to evaluate the influence of pvc film and temperature on the postharvest storage life in four cultivars of okra. the treatments were displayed in randomized complete blocks, in split-split-plot design, where the parcels were the temperatures of 5 and 10oc, and in the sub parcels a 2 (control and pvc wrapped fruits) x 4 (cultivars amarelinho, red velvet, star of david and mammoth spinless) factorial, and in the sub-sub parcels six sampling moments, containing four blocks. storage at 10oc and wrapping the fruits with pvc film improved the control of fresh mass loss. the film was more efficient in maintaining higher water content in the fruit pericarp at 5 or 10oc. the cultivar amarelinho lost less fresh mass and maintained higher water content. fruits stored at 5oc had higher vitamin c content. the cultivars mammoth spinless and star of david showed lower losses of vitamin c. cultivar mammoth spinless had the highest content of chlorophyll and amarelinho the lowest. in general the development of chilling and browning was higher in fruits without pvc film at 5oc. the cultivar amarelinho had better postharvest conservation at 10oc and using pvc film.
Caracteriza??o físico-química de frutos de quatro cultivares de quiabo
Mota, Wagner F. da;Finger, Fernando Luiz;Silva, Derly José H. da;Corrêa, Paulo César;Firme, Lúcia P.;Neves, Ludmila L. de M.;
Horticultura Brasileira , 2005, DOI: 10.1590/S0102-05362005000300006
Abstract: in an experiment some physical and chemical characteristics of four okra cultivars were evaluated. the experimental design was of randomized blocks, where the treatments were the cultivars amarelinho, red velvet, star of david and mammoth spinless with five replications. at commercial maturity fruits of the cultivar star of david presented the largest diameter, total fresh matter, content of dry matter, smallest length, content of water and vitamin c in comparison to the other cultivars. the cultivar red velvet presented the smallest diameter, total fresh matter, content of dry matter, reducing sugars and content of chlorophyll a, b and total, but the largest content of water and vitamin c. the cultivar amarelinho produced the longest fruits and the smallest content of chlorophyll a, b and total. the cultivars amarelinho and mammoth spinless showed higher contents of total reducing sugars.
Armazenamento de frutos de quiabo embalados com filme de PVC em condi??o ambiente
Mota, Wagner F da;Finger, Fernando Luiz;Cecon, Paulo Roberto;Silva, Derly José H da;Corrêa, Paulo César;Firme, Lúcia P;Neves, Ludmila L de M;
Horticultura Brasileira , 2006, DOI: 10.1590/S0102-05362006000200028
Abstract: the present work evaluated the influence of pvc film on the postharvest shelf life of four cultivars of okra stored at room temperature. the experiment was arranged in random blocks, in sub split parcels, where the parcels were a factorial 2x4, with and without pvc film and the cvs. amarelinho, red velvet, star of david and mammoth spinless, and the subparcels the six sample time with four blocks. the characteristics evaluated were: percentage of weight loss, relative water content, total chlorophyll and chlorophyll a and b, content of vitamin c, visual browning. the pvc was efficient in controlling the weight loss and retained the water content through storage. the lowest losses were observed for the cvs. amarelinho and star of david, without and with pvc, respectively. there was higher retention of vitamin c in the fruits wrapped with pvc and the cvs. red velvet and star of david kept higher content of it. in general, the cv. mammoth spinless kept higher content of chlorophyll. the higher incidence of browning was in fruits stored without pvc. the red velvet had better shelf life due to lower browning.
Waxes and plastic film in relation to the shelf life of yellow passion fruit
Mota, Wagner Ferreira da;Salom?o, Luiz Carlos Chamhum;Cecon, Paulo Roberto;Finger, Fernando Luiz;
Scientia Agricola , 2003, DOI: 10.1590/S0103-90162003000100008
Abstract: the high perishability of the yellow passion fruit (passiflora edulis f. flavicarpa) reduces its postharvest conservation and availability, mainly for in natura consumption. these losses of quality and commercial value occur due to the high respiration and loss of water. this work aimed to evaluate the influence of a modified atmosphere - wax emulsions and plastic film - on the shelf life of the yellow passion fruit. plastic film (cryovac d-955, 15 mm thickness) reduced fresh weight loss and fruit wilting, kept higher fruit and rind weight and higher pulp osmotic potential over the storage period. however, it was not efficient in the control of rottenness. sparcitrus wax (22-23% polyethylene/maleyc resin) caused injury to the fruit, high fruit weight losses and wilting and resulted in lower pulp osmotic potential; this wax lead to a higher concentration of acid and a lower relation of soluble solids/acidity. among the tested waxes, fruit wax (18-21% carnauba wax) was the best, promoting reduced weight loss, wilting and rottenness.
Waxes and plastic film in relation to the shelf life of yellow passion fruit
Mota Wagner Ferreira da,Salom?o Luiz Carlos Chamhum,Cecon Paulo Roberto,Finger Fernando Luiz
Scientia Agricola , 2003,
Abstract: The high perishability of the yellow passion fruit (Passiflora edulis f. flavicarpa) reduces its postharvest conservation and availability, mainly for in natura consumption. These losses of quality and commercial value occur due to the high respiration and loss of water. This work aimed to evaluate the influence of a modified atmosphere - wax emulsions and plastic film - on the shelf life of the yellow passion fruit. Plastic film (Cryovac D-955, 15 mum thickness) reduced fresh weight loss and fruit wilting, kept higher fruit and rind weight and higher pulp osmotic potential over the storage period. However, it was not efficient in the control of rottenness. Sparcitrus wax (22-23% polyethylene/maleyc resin) caused injury to the fruit, high fruit weight losses and wilting and resulted in lower pulp osmotic potential; this wax lead to a higher concentration of acid and a lower relation of soluble solids/acidity. Among the tested waxes, Fruit Wax (18-21% carnauba wax) was the best, promoting reduced weight loss, wilting and rottenness.
Composi??o mineral de frutos de quatro cultivares de quiabeiro
Mota, Wagner Ferreira da;Finger, Fernando Luiz;Silva, Derly José Henriques da;Corrêa, Paulo César;Firme, Lúcia Pittol;Ribeiro, Rosilene Ant?nio;
Ciência e Agrotecnologia , 2008, DOI: 10.1590/S1413-70542008000300009
Abstract: this experiment was carried out at universidade federal de vi?osa and had the objective to evaluate the mineral composition of four cultivars of okra fruits. the experimental design was in randomized blocks, where the treatments were composed by the cultivars amarelinho, red velvet, star of david and mammoth spinless, with five blocks. the cultivar red velvet had the highest content of calcium, phosphorus, sulfur and magnesium. the cultivar mammoth spinless had the highest content of total nitrogen, ammonium and manganese and the lowest content of phosphorus. the cultivars red velvet and star of david had the lowest contents of total nitrogen, ammonium, and manganese. lower contents of calcium, sulfur and magnesium were present in the cultivars amarelinho, star of david and mammoth spinless.
Mudan?as metabólicas após recondicionamento a 15oC de tubérculos de batata armazenados a baixa temperatura
Chapper, Marilice;Loureiro, Marcelo E.;Mosquim, Paulo R.;Araújo, Wagner L.;Pereira, Arione da S.;Finger, Fernando L.;Sim?es, Adriano N.;
Horticultura Brasileira , 2004, DOI: 10.1590/S0102-05362004000400007
Abstract: potato tubers of cultivars atlantic, eliza and pérola were firstl stored at 2oc for 10 days and then reconditioned at 15oc for 10 or 20 days, in order to verify if these treatments could reduce the cold-sweetening. the reconditioning was associated to reduced tuber sucrose levels in all cultivars analyzed, and was followed by a clear reduction in the activity of sucrose-phosphate syntase, udp-glucose pyrophosphorylase, and sucrose synthase. the decrease in invertase activity was only transient, and limited to some genotypes. these treatments also reduced linearly the glucose levels in pérola and atlantic tubers, which in turn suggest that stronger reductions could be observed under longer reconditioning periods. starch contents were not changed in reconditioned tubers, although a transient decrease in the activity of starch phosphorylase and total amidolitic activity was observed in some genotypes. these data indicate that reconditioning, even under short time periods (20 days) and mild temperatures (15°c), result in a strong and heterogeneous effect on tuber carbohydrate metabolism. more importantly, these results indicate that the reconditioning could reduce cold-sweetening in the cultivars pérola and atlantic.
Effect of pH and temperature on peroxidase and polyphenoloxidase activities of litchi pericarp
Mizobutsi, Gisele Polete;Finger, Fernando Luiz;Ribeiro, Rosilene Ant?nio;Puschmann, Rolf;Neves, Ludmila Lafetá de Melo;Mota, Wagner Ferreira da;
Scientia Agricola , 2010, DOI: 10.1590/S0103-90162010000200013
Abstract: after harvesting litchi, the red color of the fruit pericarp is rapidly lost resulting in discoloration and browning during storage and marketing. the loss of the red color is caused by the degradation or loss of stability of anthocyanins. the action of peroxidase and polyphenoloxidase is usually related to the browning and discoloration of fruits of various species. this study aimed to evaluate the influence of ph and temperature on peroxidase and polyphenoloxidase activities, in a partially purified preparation of pericarp of the litchi cultivar bengal. fruits were harvested at the ripe stage and polyphenoloxidase was partially purified by sequential saturation in 80% ammonium sulfate. at concentrations of 40-50% and 60-70% ammonium sulfate the activities of polyphenoloxidase and peroxidase were, respectively, 124 times and 158 times higher than in the crude extract. the activity of peroxidase and polyphenoloxidase was maximum at ph 6.5 and 7.0, respectively, and no activity was detected at ph 2.5 and 9.5. pre-incubation of the enzyme extract for 45 min at ph 2.5 or 9.5 completely inactivated the enzymes, with the highest degree of efficiency at ph 2.5. peroxidase activity was highest at 70oc and remained active for a period of 120 min at 70 and 80oc. peroxidase became completely inactive when maintained at 90oc for 10 min or 1 min at 100oc. polyphenoloxidase activity was highest at 20oc and remained active for a period of 120 min at 40 and 50oc and was inactivated after 10 min at 60oc. due to the high temperature of inactivation of the peroxidase and polyphenoloxidase activities, the enzymes can be inactivated more easily in fruits using acid or alkaline solutions.
Modelling a DR shaft operated with pure hydrogen using a physical-chemical and CFD approach
Andrea Ranzani Da Costa,D. Wagner,F. Patisson,D. Ablitzer
Physics , 2009,
Abstract: The hydrogen-based route could be a valuable way to produce steel considering its low carbon dioxide emissions. In ULCOS, it is regarded as a long-term option, largely dependent on the emergence of a hydrogen economy. To anticipate its possible development, it was decided to check the feasibility of using 100% H2 in a Direct Reduction shaft furnace and to determine the best operating conditions, through appropriate experimental and modelling work. We developed from scratch a new model, called REDUCTOR, for simulating this process and predicting its performance. This sophisticated numerical model is based on the mathematical description of the detailed physical, chemical and thermal phenomena occurring. In particular, kinetics were derived from experi-ments. The current version is suited to the reduction with pure hydrogen, but an extension of the model to CO is planned so that it will also be adapted to the simulation and optimisation of the current DR processes. First re-sults have confirmed that the reduction with hydrogen is much faster than that with CO, making it possible to design a hydrogen-operated shaft reactor quite smaller than current MIDREX and HYL.
Caracteriza??o agron?mica da produ??o de rizomas de clones de taro
Pereira, Francisco Hevilásio F.;Puiatti, Mário;Miranda, Glauco V.;Silva, Derly José H. da;Finger, Fernando Luiz;
Horticultura Brasileira , 2003, DOI: 10.1590/S0102-05362003000100021
Abstract: clones of taro, from the germoplasm bank of the universidade federal de vi?osa, brazil, were agronomically characterized. the experiment was carried out from 19/09/2000 to 13/07/2001, in a randomized complete block design, with 36 treatments (clones) and five replicates. the experimental unit was comprised of four rows spaced 1.0 m apart, with four meters in length. the distance between plants in the row was 0.5 m. we evaluated the average commercial rhizome weight; number of commercial rhizomes/plant; total and commercial rhizome yield; format ratio (longitudinal/transversal diameter) of the commercial production, and rhizomes classification according to the transversal diameter (large offspring >47 mm; medium offspring = 40-47 mm; small offspring = 33-40 mm; and discard < 33 mm). clones bgh 5916, bgh 6137, and bgh 6298 presented good rhizome shape (ratio between 1.1 and 1.7) and higher values of mean corm fresh commercial weight, commercial and total yields. these clones did not differ from bgh 5925 (japanese), presenting significantly higher values than bgh 5928 (chinese), the two most common taros grown in brazil. clones bgh 6307 and bgh 6308, presented slightly inferior commercial corm fresh weight than bgh 5916, bgh 6298, and bgh 6137. however, due to the higher commercial rhizomes number/plant, the commercial and total yields were similar. correlation was positive and significant between average commercial corm fresh weight per plant (0.6370 and 0.7450), number of commercial corm per plant (0.7133 and 0.5338), and yield of large corm offspring (0.9107 and 0.9451), when compared to commercial and total yields, respectively; between yield of commercial (0.9455) and of mother corm (0.8753) when compared to total yield; between commercial mean corm fresh weight (0.8519) when compared to yield of large offspring. primary components presenting high positive correlation in comparison to commercial yield were: commercial mean corm fresh weight, number of commercial c
Page 1 /194519
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.