Diatom Analysis
Mostrando 1-12 de 25 artigos, teses e dissertações.
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1. The characterization and comparison of exopolysaccharides from two benthic diatoms with different biofilm formation abilities
ABSTRACT Exopolysaccharide (EPS) of two benthic diatoms, Amphora sp. and Stauroneis sp., with different biofilm formation abilities were investigated. The ratio of suspension-cells/biofilm-cells was employed to indicate the diatom biofilm formation abilities. The soluble EPS from the supernatant of whole culture, tightly bound EPS from floating cells, loosel
An. Acad. Bras. Ciênc.. Publicado em: 2018-04
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2. Taxonomic studies of centric diatoms (Diatomeae): unusual nanoplanktonic forms and new records for Brazil
There have been few taxonomic studies of centric diatoms in lotic freshwater environments in Brazil, especially in terms of those including nanoplanktonic forms, which are often neglected in studies of local floras, because of their small size or confusing taxonomy. This is the first study focusing on centric diatoms in the flora of the state of Bahia, in no
Acta Bot. Bras.. Publicado em: 2013-06
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3. Assembléias de diatomáceas em sedimentos holocênicos no estremo sul do Brasil : reconstruções paleoambientais
This paper describes the diatom assemblages present in a sediment profile in the Lagoa do Peixe, Middle Littoral of Rio Grande do Sul, in order to make the palaeoenvironmental reconstruction and identify periods of increased marine influence and hydrodynamics, as a consequence of changes sea level occurred during the Holocene. The drill core T09 was selected
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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4. Flora diatomácea do reservatório de Tanque Grande, município de Guarulhos SP como indicadora da qualidade de água
The Tanque Grande Reservoir is responsible for supplying 10% of the total population of the city of Guarulhos, State of São Paulo, Brazil. It was constructed in order to dam the Tanque Grande River waters, an affluent of the Baquirivu-Guaçu River, which flows to the Tietê River, within the Greater São Paulo Metropolitan area. The reservoir is located wit
Publicado em: 2008
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5. Evolution of holocene lagunar sedimentation in Jaguaruna, Santa Catarina State, Brazil: a sedimentary and micropaleontological approach / Evolução da sedimentação lagunar holocênica na região de Jaguaruna, Estado de Santa Catarina: uma abordagem sedimentológica-micropaleontológica integrada
O estudo de três testemunhos rasos (até 2,5m de profundidade) coletados na região de Jaguaruna, litoral centro-sul de Santa Catarina, permitiu reconstituir parte da história de evolução sedimentar holocênica na área. Para isso, foi feita a análise integrada de quatro tipos de variáveis: sedimentológicas, diatomológicas, palinológicas e geoquími
Publicado em: 2008
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6. Produtividade Primária do Biofilme em Cultivos dos Camarões Marinhos Farfantepenaeus paulensis e Litopenaeus vannamei.
The primary production of biolm, or periphyton (a microorganisms community attached to submerged natural or artificial substrates) has been used for a long time as a strategy to improve the water quality and as a complementary food source for raised organisms. In spite of the importance of natural productivity in aquaculture systems less atention is given to
Publicado em: 2008
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7. Distribuição espacial e temporal da comunidade fitoplanctônica em uma área de malacocultura no município de Anchieta ES
The actual paper was made in the coastol region near Anchieta estuarian area in Espírito Santo State in na malacoculture area. The samples were taken monthly from January to December 2004 in 10 (ten) points: Rio, 1A, 1B, 1C, 2A, 2B, 2C, 3A, 3B, 3C. The analysis made were both a phytoplankton comunity quali-quantitative and environmental variables as water t
Publicado em: 2007
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8. A utilizaÃÃo da microalga skeletonema costatum (greville) cleve (bacillariophyceae) na avaliaÃÃo da qualidade ambiental de Ãreas estuarinas de Pernambuco
Coastal environments are characterized by the high complexity and biological diversity, where the variety overcomes others ecosystems. The estuaries represent one of the most productive ecosystems of the world, due to the great contribution of inorganic dissolved nutritients, coming from the continent. It has been changing in the last years, as a result of a
Publicado em: 2007
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9. Diatom Plastids Possess a Phosphoribulokinase with an Altered Regulation and No Oxidative Pentose Phosphate Pathway1
The chloroplast enzyme phosphoribulokinase (PRK; EC 2.7.1.19) is part of the Calvin cycle (reductive pentose phosphate pathway) responsible for CO2 fixation in photosynthetic organisms. In green algae and vascular plants, this enzyme is light regulated via reversible reduction by reduced thioredoxin. We have sequenced and characterized the gene of the PRK fr
American Society of Plant Biologists.
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10. The Diatom EST Database
The Diatom EST database provides integrated access to expressed sequence tag (EST) data from two eukaryotic microalgae of the class Bacillariophyceae, Phaeodactylum tricornutum and Thalassiosira pseudonana. The database currently contains sequences of close to 30 000 ESTs organized into PtDB, the P.tricornutum EST database, and TpDB, the T.pseudonana EST d
Oxford University Press.
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11. Nitrate Reductase from the Marine Diatom Skeletonema costatum (Biochemical and Immunological Characterization).
Assimilatory nitrate reductase (NR) was purified from the marine diatom Skeletonema costatum (clone Skel) using Cibacron blue-Sepharose affinity chromatography. The single-step purification scheme yielded a 103-fold purification of specific activity with an overall recovery of 40.8%. Only NADH-dependent NR activity (form EC 1.6.6.1) was observed in this spec
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12. Isolation and characterization of glutamine synthetase from the marine diatom Skeletonema costatum.
Two peaks of glutamine synthetase (GS) activity were resolved by anion-exchange chromatography from the marine diatom Skeletonema costatum Grev. The second peak of activity accounted for greater than 93% of total enzyme activity, and this isoform was purified over 200-fold. Results from denaturing gel electrophoresis and gel-filtration chromatography suggest