oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

4 ( 1 )

2020 ( 8 )

2019 ( 413 )

2018 ( 572 )

Custom range...

Search Results: 1 - 10 of 468771 matches for " Eduardo J. Cáceres "
All listed articles are free for downloading (OA Articles)
Page 1 /468771
Display every page Item
Nuevas citas de Zygnemataceae (Zygnematales, Chlorophyta) para el continente americano
Nora C. Ferrer,Eduardo J. Cáceres
Darwiniana , 2001,
Abstract: Dos especies de Zygnemataceae, Spirogyra nyctigama y Zygnema subcylindricum, se citan, describen e ilustran por primera vez para el continente americano. Una tercera, Z. synadelphum, se menciona por primera vez para Sudamérica, siendo éste el registro más austral para esta especie en el hemisferio occidental. El estudio se llevó a cabo en la provincia de Buenos Aires, Argentina
Fine structural study of the red seaweed Gymnogongrus torulosus (Phyllophoraceae, Rhodophyta)
Estevez,José M.; Cáceres,Eduardo J.;
Biocell , 2003,
Abstract: the present study analyzed several characters of the red seaweed gymnogongrus torulosus, such as cellular structure of the thallus, cuticle, pit plug and cell wall ultrastructure, and morphology of some organelles like plastids, golgi bodies and mitochondria. also, anomalous chloroplasts with thylakoid disorganization were found in medullary cells. the significance of this thylakoid disposition is still unclear. this is one of the first studies focused on the fine structure of a red alga recorded in argentina.
Fine structural study of the red seaweed Gymnogongrus torulosus (Phyllophoraceae, Rhodophyta)
José M. Estevez,Eduardo J. Cáceres
Biocell , 2003,
Abstract: The present study analyzed several characters of the red seaweed Gymnogongrus torulosus, such as cellular structure of the thallus, cuticle, pit plug and cell wall ultrastructure, and morphology of some organelles like plastids, Golgi bodies and mitochondria. Also, anomalous chloroplasts with thylakoid disorganization were found in medullary cells. The significance of this thylakoid disposition is still unclear. This is one of the first studies focused on the fine structure of a red alga recorded in Argentina.
Cytochemical localization of acid phosphatase in Stigeoclonium tenue (Chaetophorales, Chlorophyceae)
Michetti,Karina M.; Leonardi,Patricia I.; Cáceres,Eduardo J.;
Biocell , 2006,
Abstract: nonspecific acid phosphatases are a group of enzymes whose activity increases the availability of exogenous and endogenous orthophosphate either through extra- or intracellular hydrolysis of phosphate compounds. our study demonstrates the activity of acid phosphatases in the filamentous freshwater alga stigeoclonium tenue. these enzymes were detected following a cerium-based method in which cerium was used as an orthophosphate-capture reagent. in thalli from s. tenue from the natural environment, acid phosphatases were found in the longitudinal cell wall, plasmalemma, and vacuole. in thalli from bold's basal medium culture, these enzymes were found mainly in the plasmalemma; they were scarce in the cell wall. in the thalli grown in phosphate-enriched culture medium, enzymes were found only in the plasmalemma. the low availability of orthophosphate in the medium seems to induce the transport of these enzymes to the cell wall. its abundance, on the contrary, seems to attenuate this response without affecting the localization of acid phosphatases in the plasmalemma.
Morfología vegetativa y reproducción asexual de Draparnaldia Mutabilis (Chaetophoraceae, Chlorophyta), primer registro fundamentado para Argentina
Michetti,Karina M.; Leonardi,Patricia I.; Cáceres,Eduardo J.;
Darwiniana , 2007,
Abstract: thalli of draparnaldia mutabilis consist of a reduced, prostrate rhizoidal system and an erect system with marked differentiation between axial and lateral, highly branched, filaments, grouped in dense fascicles. the asexual reproduction is by zoospores with an erect germination pattern. this is the first verified report of this species for argentina. in addition, a key to the best-described species is provided.
Cytochemical localization of acid phosphatase in Stigeoclonium tenue (Chaetophorales, Chlorophyceae)
Karina M. Michetti,Patricia I. Leonardi,Eduardo J. Cáceres
Biocell , 2006,
Abstract: Nonspecific acid phosphatases are a group of enzymes whose activity increases the availability of exogenous and endogenous orthophosphate either through extra- or intracellular hydrolysis of phosphate compounds. Our study demonstrates the activity of acid phosphatases in the filamentous freshwater alga Stigeoclonium tenue. These enzymes were detected following a cerium-based method in which cerium was used as an orthophosphate-capture reagent. In thalli from S. tenue from the natural environment, acid phosphatases were found in the longitudinal cell wall, plasmalemma, and vacuole. In thalli from Bold's Basal Medium culture, these enzymes were found mainly in the plasmalemma; they were scarce in the cell wall. In the thalli grown in phosphate-enriched culture medium, enzymes were found only in the plasmalemma. The low availability of orthophosphate in the medium seems to induce the transport of these enzymes to the cell wall. Its abundance, on the contrary, seems to attenuate this response without affecting the localization of acid phosphatases in the plasmalemma.
Morfología vegetativa y reproducción asexual de Draparnaldia mutabilis (Chaetophoraceae, Chlorophyta), primer registro fundamentado para Argentina
Karina M. Michetti,Patricia I. Leonardi,Eduardo J. Cáceres
Darwiniana , 2007,
Abstract: Draparnaldia mutabilis posee un talo compuesto por un sistema rizoidal postrado reducido y un sistema erguido que muestra una marcada diferenciación entre filamentos axiales y laterales, estos últimos agrupados en fascículos densos, altamente ramificados. La reproducción asexual ocurre por medio de zoósporas que poseen un patrón de germinación erguido. El registro de esta especie constituye la primera cita cierta para la República Argentina. Se presenta además, una clave con las especies mejor definidas.
Precisiones sobre la morfología y ultraestructura del talo de chaetophora elegans (chaetophorales, chlorophyta)
Karina M. Michetti,Patricia I. Leonardi,Eduardo J. Cáceres
Darwiniana , 2003,
Abstract: Se describe el talo de Chaetophora elegans precisando la morfología de los sistemas postrado y erguido, se realiza el primer estudio detallado de la ultraestructura vegetativa en el género y se amplía la distribución de la especie en la República Argentina
Secondary zoospores in the algal endoparasite Maullinia ectocarpii (Plasmodiophoromycota)
Parodi,Elisa R.; Cáceres,Eduardo J.; Westermeier,Renato; Müller,Dieter G.;
Biocell , 2010,
Abstract: the present paper deals with the ultrastructure of zoospores produced by the plasmodiophorid maullinia ectocarpii, living in the marine algal host ectocarpus siliculosus. the zoospores described here are very similar to secondary zoospores of polymyxa graminis and phagomyxa sp.(the latter an algal endoparasite, also). our results indicate that m. ectocarpii produces two types of plasmodia, and suggest that is a species with a complete life cycle, as it is known for all the plasmodiophormycota that have been studied. sporogenic and sporangial plasmodia produce, respectively, primary zoospores with parallel flagella within thick walled resting sporangia, and secondary zoospores with opposite flagella within thin walled sporangia.
Caracterización citomorfomérica de Anabaena circinalis (Cyanophyta) en una proliferación masiva en el embalse Paso de Las Piedras (Provincia de Buenos Aires, Argentina)
Arga?araz Bonini,Gimena; Parodi,Elisa R.; Cáceres,Eduardo J.;
Bolet?-n de la Sociedad Argentina de Bot??nica , 2005,
Abstract: the principal goal of the work was to make a statistical analysis of the morphology of individuals of anabaena circinalis growing in a bloom in embalse paso de las piedras (provincia de buenos aires, argentina), identified by a gene probe for this species. our results suggest that 1) it is possible to characterise individuals of a. circinalis growing in eutrophic condition, by using statistical parameters of the vegetative cells dimensions, 2) the criterion based on akinete morphology should not be used for characterization given the no maturation of akinetes in eutrophic conditions and the trend to morphological uniformity between the vegetative cells and immature akinetes, and 3) spherical heterocyst and vegetative cells can be discriminated by size but not by shape, whereas both can be differentiated from ovoidal akinetes. the variance analysis of the length of vegetative cells indicates all trichomes belong to the same species.
Page 1 /468771
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.