Paramecium
Mostrando 1-12 de 226 artigos, teses e dissertações.
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1. Riqueza e distribuição de eucariontes unicelulares em três córregos sob influência antrópica na cidade de Ivinhema, Mato Grosso do Sul, Brasil
Eucariontes unicelulares são abundantes na maioria dos ambientes aquáticos, contribuindo de várias maneiras nos ecossistemas, tais como produtores, consumidores primários e secundários, exercendo um importante papel no declínio e controle de comunidades bacterianas e ciclagem de nutrientes. O objetivo desse estudo foi descrever a riqueza e distribuiç�
Rev. Ambient. Água. Publicado em: 2013-08
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2. Estudo biológico de linhagens do protozoário ciliado Paramecium Caudatum Ehrenberg, 1833 e avaliação experimental do efeito tóxico do agrotóxico Fipronil
Protozoários têm sido propostos como indicadores biológicos de poluição aquática devido à sua sensibilidade a alterações ambientais, ao seu curto ciclo de vida e facilidade para cultivo, o presente trabalho pretendeu estudar duas linhagens do protozoário ciliado Paramecium caudatum Ehrenberg, 1833 (PC1, isolada da Represa do Monjolinho - São Carlo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/11/2010
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3. Os estudos experimentais de Herbert Spencer Jennings com protozoários (1908-1912): aspectos evolutivos e genéticos
Esta tese trata das contribuições de Herbert Spencer Jennings (18681947) para a genética e evolução de 1908 a 1912. Durante este período o biólogo norte-americano desenvolveu uma série de experimentos com Paramecium, inclusive procurando testar experimentalmente a ação dos processos de seleção. O objetivo desta tese é analisar os resultados dos
Publicado em: 2009
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4. Estudo das interações fitoplâncton-protozooplâncton no reservatório de Barra Bonita, SP, com ênfase na toxicidade de microcistinas
The increasing eutrophication of aquatic environments, resulting from the human activities, is related to cyanobacterial blooms that are described, all over the world, as the agents causing toxicity and death in humans, domestic and wild animals. Recently, studies are being conducted aiming to prove the possibility of the biotransference of the cyanobacteria
Publicado em: 2009
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5. Avaliação da atividade microbiana metanogênica na lagoa de estabilização anaeróbia da estação de tratamento de esgotos sanitários do município de Cajati, Vale do Ribeira do Iguape, Estado de São Paulo / Assessment of anaerobic methanogenic microbial activity at anaerobic stabilization pond of domestic wastewater plant at Cajati city, Vale do Ribeira de Iguape, São Paulo State, Brazil
Microbial diversity studies have remarkable relevance since the knowledge about the microbiology of process can improve plants and system efficiency. This work assessed microbial activity, specially methanogenic, at anaerobic pond for domestic wastewater treatment in the city of Cajati, São Paulo State, Brazil. Poliphasic taxonomy was adopted in onder to co
Publicado em: 2007
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6. A single telomerase RNA is sufficient for the synthesis of variable telomeric DNA repeats in ciliates of the genus Paramecium.
Paramecium telomeric DNA consists largely of a random distribution of TTGGGG and TTTGGG repeats. Given the precise nature of other ciliate telomerases, it has been postulated that there are two distinct types of the Paramecium enzyme, each synthesizing perfect telomeric repeats: one with a template RNA that specifies the addition of TTTGGG and the second dic
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7. A mutant Paramecium with a defective calcium-dependent potassium conductance has an altered calmodulin: a nonlethal selective alteration in calmodulin regulation.
The Paramecium mutant, pantophobiac A, has a defect that results in an in vivo loss of calcium-dependent potassium efflux channel activity. This defect is corrected fully by the microinjection of wild-type Paramecium calmodulin into pantophobiac A cells and is partially restored by calmodulins from other organisms, but it cannot be restored by microinjection
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8. Okadaic acid, an inhibitor of protein phosphatase 1 in Paramecium, causes sustained Ca2(+)-dependent backward swimming in response to depolarizing stimuli.
Backward swimming is a stereotypic behavioural response of Paramecium. It is triggered by depolarizing stimuli, which open calcium channels in the excitable ciliary membrane. The influx of Ca2+ causes the reversal of ciliary beat and initiates backward swimming. Here, we demonstrate that the protein phosphatase inhibitor okadaic acid does not affect the norm
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9. Analysis of NADH dehydrogenase proteins, ATPase subunit 9, cytochrome b, and ribosomal protein L14 encoded in the mitochondrial DNA of Paramecium.
The mitochondrial (mt) encoded ndh1, ndh3, ndh4, ndh5, rpl14, cyt b and atp9 gene products were identified by sequence comparisons with known proteins. Amino acid sequence comparisons between predicted Paramecium mt gene products and proteins in current databases were quantitated approximately by the means of similarity scores for pairs of aligned sequences.
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10. Isolation and translation of mRNA coding for the variant surface antigens of Paramecium.
In the poly(A)+RNA isolated from the ciliate Paramecium primaurelia is found a discrete and abundant mRNA species of high molecular weight (corresponding to about 9,000 nucleotides). This mRNA species has size and abundance characteristics that identify it tentatively as the message coding for the variant cell-surface antigens. After microinjection of the hi
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11. 3'-modified antisense oligodeoxyribonucleotides complementary to calmodulin mRNA alter behavioral responses in Paramecium.
The calcium-binding protein calmodulin has been shown to modulate the Ca(2+)-dependent ion channels of Paramecium tetraurelia. Mutations in the calmodulin gene of Paramecium result in an altered pattern of behavioral responses. Antisense oligodeoxyribonucleotides (ODNs), complementary to calmodulin mRNA in Paramecium, were synthesized from a modified solid s
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12. The nucleotide sequences of 5S rRNAs from three ciliated protozoa.
The nucleotide sequences of 5S rRNAs from three ciliated protozoa, Paramecium tetraurelia, Tetrahymena thermophila and Blepharisma japonicum have been determined. All of them are 120 nucleotides long and the sequence of probable tRNA binding site of position 41-44 is GAAC which is characteristic of the plant 5S rRNAs. The sequence similarity percents are 87%