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| Registros recuperados: 2.860 | |
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| Amaral,Adriana; Takaki,Massanori. |
| The germination of achenes of Bidens pilosa L. was analyzed during the life span of the mother plant. Decrease in the range of achene size was monitored until the senescence of the mother plant when the shortest achenes were harvested. The analysis of the germination percentage confirmed the presence of two distinct classes, formerly defined as short and long ones. Because length can not be used for the separation of those classes, the morphological characteristics of the tegument, specially of the ornament must be used for separation of the achenes with verrucose tegument (formerly named as short achenes) and achenes without ornament of the tegument (formerly named as long achenes). The achenes with verrucose tegument presented dormancy and light... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bidens pilosa; Seed dimorphism; Phytochrome; Seed germination. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000100002 |
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| Neves,Valdir Augusto; Lourenço,E. J.. |
| Peroxidase from peach fruit was purified 28.9-fold by DEAE-cellulose, Sephadex G-100 and hydroxylapatite chromatography. The purified enzyme showed only one peak of activity with an optimum pH of 5.0 and temperature of 40ºC. The calculated activation energy (Ea) for the reaction was 7.97 kcal/mol. The enzyme was heat-labile in the temperature range of 60 to 80ºC with a fast inactivation at 80ºC. PAGE of the inactivation course at 70ºC showed only one band of activity. Different sugars increased the heat stability of the activity in the following order: sucrose>lactose>glucose>fructose. Measurement of residual activity showed a stabilizing effect of sucrose at various temperature/sugar concentrations (10 to 40%, w/w) with the Ea for inactivation... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Peach peroxidase; Purification; Heat stability; Regeneration. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000200002 |
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| Araújo,Francisco Gerson. |
| An adaptation of index of biotic integrity (IBI) was performed for the first time in Brazil at the Rio Paraíba do Sul, between Barra Mansa and Barra do Piraí, a very important extent of this river because of the high pollution levels, and for being the main abstraction source of Rio de Janeiro city water supply. A monthly standardised sampling programme, from March-1995 to February-1996, was carried out at four sites. Seines, casting nets and net trays were used for catching fishes. IBI was obtained by integrating 12 ecological and environmental attributes of fish taxocene, populations, and individual organisms to assess biological integrity based in Species Composition, Trophic Structure and Fish Condition. Overall, water quality was classified between... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rio Paraíba do Sul; Integridade Biótica; Peixes; Poluição. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000300016 |
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| Couto,Erminda da Conceição Guerreiro; Savian,Michelle. |
| Sediment cores 40 cm depth were taken in triplicate at nine points along an unvegetable intertidal flat, to assess the ecological implications of sedimentological characteristics. Each core was sectioned in 5 cm depht layers. In these sub-samples temperature, pH, water, organic matter and carbonate content were determined. Granulometric analysis, porosity, qualitative and quantitative identification of sediment components were also carried. The sediments presented low water (15.6 - 37.2 %), organic matter (0.7 - 5.0 %) and carbonates (0.3 - 1.0 %) contents, prevailing fine to very fine sand at surface. Statistical analysis showed a strong horizontal homogeneity regarding sedimentological and physiochemical parameters. Organic matter exhibit a general trend... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Planície intertidal; Sedimento; Análise granulométrica; Calcáreo biodetrítico. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000200011 |
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| Silveira,Mauricio M.; Berbert-Molina,M.; Prata,A. M. R.; Schmidell,W.. |
| In batch mode, Klebsiella pneumoniae growth and 2,3-butanediol/acetoin formation are increasingly inhibited by initial sucrose concentrations (S0) over 60 g/L. At non inhibitory conditions, a maximum sucrose consumption rate of 1,5 g/L/h was measured. With S0=204 g/L however, this rate decreased to 0.15 g/L/h. K. pneumoniae fermented 204 g/L sucrose to produce 84.3 g/L of a mixture 2,3-butanediol/acetoin with a yield of 0.41 g/g and a productivity of 1.06 g/L/h. Higher oxygen transfer rates improved the overall process rate but the product yield was reduced. Avoiding substrate inhibition, by performing the fermentation in fed-batch mode, a final 2,3-butanediol/acetoin concentration of 80.0 g/L was achieved. In this case, a productivity of 2.63 g/L/h and a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Klebsiella pneumoniae 2; 3-butanediol/batch process fed-batch process. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000300009 |
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| Grossmann,Maria Victória E.; Mandarino,José Marcos G.; Yabu,Márcia Cristina. |
| Flours with different physicochemical and functional properties were obtained from malted corn. Response surface methodology (RSM) was used to study the effects of malting time (1,3, 5 days), malting temperature (20, 25, 30º C) and gibberelic acid concentration (0.0; 0.5; 1.0 %) on these properties. The chemical composition and paste viscosity of flours were significantly affected by malting time and temperature, while water solubility index (WSI) and water absorption index (WAI) varied only with malting time. Gibberelic acid did not significantly influenced any of the studied properties. Germination at 20-25ºC for 3 days was recomended to obtain corn flour with high WAI, low viscosity and medium WSI, without excessive loss of proteins. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Malting; Corn flour; Functional properties. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000200003 |
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| Mendonça,Joalice de Oliveira; Cervi,Armando Carlos; Guimarães,Olavo Araújo. |
| An inventory of the Erythroxylum's species from the State of Paraná, Brazil, was done and the following species were found: E. ambiguum Peyr., E. amplifolium (Mart.) O.E. Schulz, E. anguifugum Mart., E. argentinum O.E. Schulz, E. buxus Peyr., E. campestre A. St.-Hil., E. cuneifolium (Mart.) O.E. Schulz, E. cuspidifolium Mart., E. deciduum A. St.-Hil., E. gonocladum (Mart.) O.E. Schulz, E. nanum A. St.-Hil., E. pelleterianum A. St.-Hil., E. microphyllum A. St.-Hil., E. myrsinites Mart. and E. suberosum A. St.-Hil.. All of then are taxonomically revised and a new synonym is presented: E. cuneifolium (Mart.) O.E. Schulz var. squarrosum O.E. Schulz as synonym of E. cuneifolium (Mart.) O.E. Schulz. Is also discussed the validity of the genus name Erythroxylon... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Erythroxylaceae; Erythroxylum; Flora; Paraná; Taxonomy. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000300013 |
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| Beneditto,Ana Paula Madeira Di; Ramos,Renata Maria Arruda; Lima,Neuza Rejane Wille. |
| Research on fishing activity at Atafona village, in Northern Rio de Janeiro, Brazil (21°35'S), was carried out between 1987-96 for the purpose of relating it to the accidental capture of small cetaceans and of estimating the relationship between fishing activity and the diet of small cetaceans. Data on fishing operations were obtained at the cold storage plants management, from interviews with fishermen and personal observations. The most representative fishing resources were Xyphopenaeus kroyeri, Micropogonias furnieri, Carcharhinus plumbeus, C. acronotus,and Rhizoprionodon porosus. Gillnets are responsible for the accidental capture of small cetaceans in the region, mainly Pontoporia blainvillei and Sotalia fluviatilis (marine form). Four types of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fishery; Accidental capture; Pontoporia blainvillei; Sotalia fluviatilis. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000300004 |
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| Teodoro,Ueslei; Galati,Eunice A.B.; Kühl,João Balduíno; Lozovei,Ana Leuch; Barbosa,Orlando Carlos. |
| Evaluation of DDT insecticide used to sand flies control in domiciles and domestic animal shelters in an endemic area of cutaneous leishmaniasis. Collections of sand flies were made with Falcão traps in houses, in one pigsty and in one tree in Jussara Farm, municipality of Jussara, State of Paraná, Brazil, between 10 p.m. and 2 a.m. during 7 days from March 24 to April 1, 1992. In May, 1992 DDT insecticide (Dicloro Difenil Tricloro Etano) (1 g/square meter of area) was applied internally and externally on houses and in pigsty. After this, new collections of sand flies were made from July 1992 to February 1993, once a month, with Falcão traps installed in the same hour and conditions mentioned above. Before DDT insecticide application 12,960 sand flies were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Leishmania; Leishmaniose; Controle de flebotomíneos; DDT. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000300014 |
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| Pirozi,Mônica R.; Germani,Rogério. |
| The aim of this work was to evaluate changes in technological properties of newly milled flours of BR-23, BR-35 and Anahuac varieties (Brazilian grown wheat) during storage for 180 days. Quality of samples was analysed for their rheological properties, acidity, falling number, glutomatic test and baking test, after periods of 0, 7, 15, 30, 60, 90, 120, 150 and 180 days. Most evident changes were the increase in flour acitidy and dough elasticity. The other characteristics did not show expressive changes. The flour of Anahuac variety was less influenced by the storage than the other ones. The results showed an increment in the flour quality, during 60-90 days of storage, althoug the baking test did not show expressive changes during all the period of storage. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Farinha de trigo; Qualidade tecnológica; Armazenamento; Maturação. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000100015 |
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| Registros recuperados: 2.860 | |
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