El presente artículo tiene por objetivo determinar los beneficios que ofrece la helicicultura en el ámbito internacional. Para ello, se presenta un estudio de caso fue aplicado municipio San Vicente Ferrer (Antioquia), siendo este referente manejo le ha dado a como actividad económica. través aplicación una metodología cualitativa, esta investigación empleó procedimiento exploratorio y descript...

Conformational properties of several similar FMRFamide-like neuropeptides from mollusks were investigated by nuclear magnetic resonance (NMR) spectroscopy. It was found that amino acid substitutions in the N-terminal variable regions of the peptides had dramatic effects on the populations of reverse turns in solution. The populations of turns, as measured by two independent NMR parameters, were...

Phenotypic plasticity and canalization are important topics in quantitative genetics and evolution. Both concepts are related to environmental sensitivity. The latter can be modeled using a model with genetically structured environmental variance. This work reports the results of a genetic analysis of adult weight in the snail Helix aspersa. Several models of heterogeneous variance are fitted u...

Terrestrial snails choose their microhabitat according to a number of environmental factors. We evaluated the effect of light intensity and substratum complexity on microhabitat preference of the terrestrial snail Helix aspersa using a multi-factorial design. The snails were offered two levels of light intensity and two types of structural complexity, hence 16 treatments in total were used: 12 ...

N,β-D-glucopyranosyl vincosamide (GPV), a major alkaloid of Psychotria leiocarpa, constitutes up to 2.5% of the dry weight in leaves. Alkaloid content was not elicited by mechanical wounding or jasmonate. At concentrations found in natural conditions or 2.5 fold higher, GPV did not inhibit herbivory in two unrelated generalist models (Helix aspersa and Spodoptera frugiperda) or in a specific in...

The cation of methyl green carries two positive charges, that of malachite green only one; but the two dyes behave towards tissue-constituents in almost exactly the same way. These dyes are not specific for chromatin. They colour certain objects that are devoid of DNA, even when they are used in very dilute solution. The granules of cells called Kornchenzellen in the connective tissue of the co...

When a snail withdraws into its shell the only parts of the body left exposed to the air are a number of fleshy extensions of the mantle; the so-called mantle collar. This area of the body is a potentially serious source of water loss in the inactive terrestrial snail. The evaporation of water from active specimens of the common garden snail, Helix aspersa, is nearly identical to that from a fr...