Chara
Mostrando 13-24 de 64 artigos, teses e dissertações.
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13. Carófitas como reservatório de nutrientes e energia em uma lagoa costeira tropical sujeita a impactos antrópicos (RJ, Brasil)
Na Lagoa Imboassica, localizada em Macaé, RJ, Brasil (22º24'S e 42º42'W), foram identificadas duas espécies de macroalgas do gênero Chara (C. angolensis e C. fibrosa), apresentando ampla distribuição. A lagoa recebe vários impactos antrópicos, e o lançamento de esgoto não tratado é um dos mais importantes. A biomassa variou entre 172 e 510 gDW.m-
Brazilian Journal of Biology. Publicado em: 2004-08
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14. Natural diet of three species of shrimp in a tropical coastal lagoon
O conteúdo estomacal de 495 espécimens de Farfantepenaeus brasiliensis, 131 de F. paulensis (Penaeidae) e 102 de Macrobrachium acanthurus (Palaemonidae) foi analisado para estabelecer a composição de suas dietas. As espécies foram coletadas em uma lagoa costeira ao norte do Estado do Rio de Janeiro (lagoa Imboassica), entre agosto de 1995 a setembro de
Brazilian Archives of Biology and Technology. Publicado em: 2003-06
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15. Overlap of dietary niche and electivity of three shrimp species (Crustacea, Decapoda) in a tropical coastal lagoon (Rio de Janeiro, Brazil)
Three species of shrimp, Farfantepenaeus brasiliensis (Latreille, 1817), F. paulensis (Pérez-Farfante, 1967) (Penaeidae) and Macrobrachium acanthurus (Wiegmann, 1836) (Palaemonidae) were sampled at the Imboassica lagoon (Rio de Janeiro State, Brazil), in order to estimate the overlap of dietary niches and electivity of their prey, through the analysis of th
Revista Brasileira de Zoologia. Publicado em: 2003-03
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16. Epiphytic Cyanobacteria on Chara vulgaris Are the Main Contributors to N2 Fixation in Rice Fields
The distribution of nitrogenase activity in the rice-soil system and the possible contribution of epiphytic cyanobacteria on rice plants and other macrophytes to this activity were studied in two locations in the rice fields of Valencia, Spain, in two consecutive crop seasons. The largest proportion of photodependent N2 fixation was associated with the macro
American Society for Microbiology.
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17. A Tight-Seal Whole Cell Study of the Voltage-Dependent Gating Mechanism of K+-Channels of Protoplasmic Droplets of Chara corallina1
The biophysical properties of voltage-dependent K+-channels of protoplasmic droplets of Chara corallina Klein ex Willd., em, R.D.W. were investigated using the tight-seal whole cell method. Two potassium currents were observed in voltage-clamp mode and they can be used to explain the transient membrane potential time course observed in current-clamp mode. Th
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18. Degradation of Proteins Artificially Introduced into Vacuoles of Chara australis1
When an exogenous protein, bovine serum albumin, was introduced into the vacuole of a Chara australis internodal cell, it was degraded with time. This degradation proceeded only in the vacuole as far as could be observed by sodium dodecylsulfate-polyacrylamide gel electrophoresis. Degradation was inhibited by protease inhibitors such as antipain and leupepti
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19. Reaction kinetic model of a proposed plasma membrane two-cycle H(+)-transport system of Chara corallina.
Biophysical and numerical analysis methods were used to characterize and model the transport protein that gives rise to the acid and alkaline regions of Chara. A measuring system that permits the detection of area-specific current-voltage curves was used. These current-voltage curves, obtained from the inward current regions of Chara, underwent a parallel sh
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20. Plasmalemma Voltage Noise in Chara corallina1
Voltage noise analysis is applied to plasmalemma ion transport in Chara corallina. There is a component in the noise power spectrum that is probably associated with current fluctuations within passive transport channels, and another component that may be associated either with fluctuations in the number of open channels, or with active transport. The data al
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21. Cooperative behavior of K+ channels in the tonoplast of Chara corallina.
Spontaneous cooperatively of K+ channels is studied in excised patches of Chara corallina tonoplasts. Bar histograms (dwell time versus number of open channels) are constructed from the time series of current by means of the higher-order Hinkley detector (R. Schultze and S. Draber. 1993. J. Membr. Biol. 132:41-52). A statistical test, based on these bar hist
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22. HCO3− Influx Across the Plasmalemma of Chara corallina: Divalent Cation Requirement 1
An absolute requirement for divalent cations is reported for H14CO3− influx in Chara corallina. Effective substitution of eluted Ca2+ by Mg2+ and Sr2+ was observed, but Mn2+ was completely ineffective in restoring H14CO3− transport activity. Similarly, La3+ could not substitute for Ca2+ in this system. Low concentrations of ethylenediaminetetraacetate (0
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23. Actin of Chara Giant Internodal Cells: A Single Isoform in the Subcortical Filament Bundles and a Larger, Immunologically Related Protein in the Chloroplasts
Internodal cells of Chara corallina Klein ex. Wild have been studied to determine the number of actin isoforms they contain and whether actin occurs at locations in the cortical cytoplasm outside the filament bundles. A monoclonal antibody to chicken actin is specific for actin in numerous animal cells but binds to two Chara proteins after their separation b
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24. The Mitochondrial Genome of Chara vulgaris: Insights into the Mitochondrial DNA Architecture of the Last Common Ancestor of Green Algae and Land PlantsW⃞
Mitochondrial DNA (mtDNA) has undergone radical changes during the evolution of green plants, yet little is known about the dynamics of mtDNA evolution in this phylum. Land plant mtDNAs differ from the few green algal mtDNAs that have been analyzed to date by their expanded size, long spacers, and diversity of introns. We have determined the mtDNA sequence o
American Society of Plant Biologists.