Ciliates Protozoa
Mostrando 1-12 de 34 artigos, teses e dissertações.
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1. First report of Epibiont ciliates (Ciliophora: Peritrichia) living on larvae of Leptophlebiidae (Ephemeroptera) from Brazil
ABSTRACT Epibiosis was understood as a commensalism relation between two or more organisms. However, some studies have shown that epibionts can cause deleterious effects to their host. Here, we reported the first report of epibiosis between protozoa Epibiont ciliates (Ciliophora: Peritrichia) living on larvae of Ephemeroptera from Brazil.
Braz. arch. biol. technol.. Publicado em: 02/05/2017
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2. Abundance and diversity of rumen protozoa in lambs fed Gliricidia sepium silage
The objective of this study was to evaluate changes in ruminal protozoa in lambs after partial replacement of feed concentrates in their diets with Gliricidia sepium silage. Twenty-four male Santa Ines lambs with an average initial weight of 14.5 kg were used. The experimental design was completely randomized, with four treatments and six replications. Treat
R. Bras. Zootec.. Publicado em: 2014-08
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3. Protozoans bacterivory in a subtropical environment during a dry/cold and a rainy/warm season
In aquatic ecosystems, bacteria are controlled by several organisms in the food chain, such as protozoa, that use them as food source. This study aimed to quantify the ingestion and clearance rates of bacteria by ciliates and heterotrophic nanoflagellates (HNF) in a subtropical freshwater reservoir (Monjolinho reservoir -São Carlos -Brazil) during one year
Braz. J. Microbiol.. Publicado em: 2014
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4. Quantitative and differential analysis of ciliate protozoa in rumen content samples filtered before and after fixation
The objective of this study was to assess whether the straining of rumen content samples influences the estimation of protozoal density. Ninety rumen samples were obtained from 30 cattle (three samples per animal). The samples were subjected to one of three treatments at the moment of collection: 1) fixation informalin without straining(control treatment), 2
R. Bras. Zootec.. Publicado em: 2013-11
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5. VARIAÇÃO ESTACIONAL DAS POPULAÇÕES DE PROTOZOÁRIOS CILIADOS (PROTISTA, CILIOPHORA) DO RÚMEN DE OVINOS (Ovis aries L.) MANTIDOS EM PASTAGENS NATURAIS NO SEMI-ÁRIDO DE PERNAMBUCO, BRASIL
Os protozoários ciliados do rúmen integram a microbiota ruminal e junto das bactérias, fungos e protozoários flagelados participam da digestão fermentativa nos ruminantes. Entretanto, o papel desempenhado por estes microorganismos no metabolismo do hospedeiro apresenta pontos controversos os quais se devem em parte, à complexidade da dinâmica populaci
Publicado em: 2007
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6. Efeitos da levedura, monensina sódica e salinomicina na degradabilidade, digestibilidade, parâmetros ruminais e protozoários ciliados de novilhos Nelore arraçoados com dietas concentradas / Effects of the yeast, monensin and salinomycin in the degradability, digestibility, rumen parameters and ciliates protozoa in termination diet Nellore steers
Foram utilizados quatro Novilhos nelore, com peso vivo médio de 190 ± 32 kg, canulados no rúmen num experimento com delineamento Quadrado Latino 4x4, onde o objetivo do trabalho foi avaliar o efeito da levedura, monensina e salinomicina sobre os parâmetros ruminais e o aparecimento de protozoários ciliados ruminais.O experimento foi executado no Campus
Publicado em: 2006
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7. Diurnal changes in concentration of rumen ciliates and in occurrence of dividing forms in water buffalo (Bubalus bubalus) fed once daily.
When buffalo were fed once daily, significant diurnal variations in concentration of rumen ciliates and occurrence of dividing protozoa were found. Differences in proportions of dividing Entodinium- and Diplodinium-type ciliates were also observed. Results obtained suggest that the range of diurnal fluctuations in rumen protozoa concentration may be related
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8. Fungicide Enhancement of Nitrogen Fixation and Colonization of Phaseolus vulgaris by Rhizobium phaseoli
The number and weight of pods and the weight and nitrogen content of the tops of beans (Phaseolus vulgaris) derived from seeds inoculated with a thiram-resistant strain of Rhizobium phaseoli were increased if the seeds were treated with thiram before sowing in soil. A greater percentage of the nodules on 21-day-old plants were derived from the resistant stra
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9. Population Dynamics of Active and Total Ciliate Populations in Arable Soil Amended with Wheat
Soil protozoa are characterized by their ability to produce cysts, which allows them to survive unfavorable conditions (e.g., desiccation) for extended periods. Under favorable conditions, they may rapidly excyst and begin feeding, but even under optimal conditions, a large proportion of the population may be encysted. The factors governing the dynamics of a
American Society for Microbiology.
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10. Size-selective grazing on bacteria by natural assemblages of estuarine flagellates and ciliates.
The small average cell size of in situ bacterioplankton, relative to cultured cells, has been suggested to be at least partly a result of selection of larger-sized cells by bacterivorous protozoa. In this study, we determined the relative rates of uptake of fluorescence-labeled bacteria (FLB), of various cell sizes and cell types, by natural assemblages of f
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11. Separation of small ciliate protozoa from bacteria by sucrose gradient centrifugation.
Small ciliate protozoa of the genus Uronema were separated from labeled bacteria by means of a discontinuous sucrose gradient. More than 98% of the radioactivity associated with the bacteria was found in the upper portion of the gradient, whereas the remaining portion of the gradient contained the ciliates.
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12. Protozoan Bacterivory and Escherichia coli Survival in Drinking Water Distribution Systems
The development of bacterial communities in drinking water distribution systems leads to a food chain which supports the growth of macroorganisms incompatible with water quality requirements and esthetics. Nevertheless, very few studies have examined the microbial communities in drinking water distribution systems and their trophic relationships. This study
American Society for Microbiology.