Showing papers by "National University of Comahue published in 1991"
TL;DR: The zymograms of embryos exposed for 72 or 120 hr to malathion and then transferred to uncontaminated medium for 120 hr were similar to that of control embryos, and Acrylamide disc electrophoresis showed several bands of esterase activity in control embryos.
19 citations
TL;DR: Alstroemeria aurea recovered after vegetative-shoot cutting by producing new vegetative shoots and curtailing the development of reproductive shoots, which could prevent further invasions by ruderals.
13 citations
TL;DR: Results suggest that after agonist-dependent hydrolysis of phosphoinositides, PIP and PIP 2 kinases are activated in control but not in Dieldrin-treated oocytes.
12 citations
TL;DR: Intensive sampling of a small temperate lake of the Araucanian region (Argentina), revealed changes in the demography of Bosmina longirostris when the diatom Asterionella formosa density increased (to 54 000 cells ml−1).
Abstract: Intensive sampling of a small temperate lake of the Araucanian region (Argentina), revealed changes in the demography of Bosmina longirostris when the diatom Asterionella formosa density increased (to 54 000 cells ml−1). Bosmina population behaviour in the field was consistent with the idea that large numbers of Asterionella caused its starvation. Individuals were actually colourless and fecundity dropped to zero, as was evident when Asterionella reached 99.4% of total phytoplankton biovolume. Since cyanophytes, as a whole, are scarce in these lakes, we propose that the flagellate/diatom ratio has a direct effect on cladoceran demography.
10 citations
TL;DR: Pomphorhynchus patagonicus n.
Abstract: Pomphorhynchus patagonicus n. sp. is described from Lake Rosario, Chubut Province, Argentina. It is characterized by a long neck forming an asymmetrical bulb with 2 well differentiated dorsal protruberances and 14 alternating rows of 13 and 14 proboscis hooks, each row with a stout fourth hook. It most closely resembles Pomphorhynchus sebastichthydis Yamaguti, 1939, from Japan, but differs in the bulb protruberances and in having more rows of hooks and more hooks per row and in the shapes of the fourth and basal hooks. Among American species P. patagonicus shows some similarities to Pomphorhynchus yamagutii Schmidt and Hugghins, 1973, from Chile, but differs with respect to the longer neck, bulb protruberances, and proboscis armature. Pomphorhynchus patagonicus is endemic to Patagonia, where its definitive type host is the endemic fish Patagonina hatcheri (Atherinidae) and its intermediate host the endemic freshwater amphipod Hyalella patagonica. It has been found also in autochthonous fishes belonging to the families Galaxiidae and Percichthyidae and in introduced salmonid fishes.
10 citations
01 Jan 1991
8 citations
TL;DR: A physiological and biochemical study of the noxious effect of Dieldrin on the toad embryonic development and the inhibition of cholinesterases during early development.
Abstract: Dieldrin is a cylclodiene insecticide highly persistent in nature due to its chemical stability. The exposure of toad embryos to Dieldrin induces hyperactivity in the swimming larvae and inhibition of cholinesterases. However, the inhibition of these enzymes during early development is not life threatening. The present report provides a physiological and biochemical study of the noxious effect of Dieldrin on the toad embryonic development.
7 citations
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TL;DR: The authors observar el fenomeno de la Lectura literaria en un cuento de Jorge Luis Borges titulado "Pierre Menard, autor del Quijote", publicado en Buenos Aires en 1944 en una coleccion de cuentos titulada ficciones.
Abstract: El proposito del presente trabajo es observar el fenomeno de la Lectura literaria en un cuento de Jorge Luis Borges titulado "Pierre Menard, autor del Quijote", publicado en Buenos Aires en 1944 en una coleccion de cuentos titulada ficciones, y en Respiracion Artificial
1 citations