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With the mass asymmetry described by the dynamical collective fragmentation coordinate ξ, and with use of the asymmetric two-center shell model, the fission mass distributions for 226Ra, 236U, and 258Fm (which are typical representatives for triple-, double-, and single-humped distributions) are explained.
Los Lumbrineridae están comprendidos en la superfamilia Eunicoidea dentro de la cual se relacionan por un lado con los Eunicidae, Onuphidae e Iphiltimidae y por otro con los Arabellidae. Con los primeros tienen algunas afinidades en la estnlctura del complejo maxilo-mandiblllar, y con los segundos coinciden en la morfologÍa externa (extremo anterior, parapodios). En el área considerada han sido halladas 15 especies, todas las cuales están representadas en las colecciones estudiadas. Dos de ellas son nuevas para la ciencia y once son citadas por primera vez para la provincia biogeográfica Argentina. De los 5 géneros comprendidos. dos han sido creados en este trabajo, e incluyen varias especies antes asignadas al género axial Lumbrineris. Ello fue posible por haberse dispuesto de ejemplaTes muy bien conservados que pel'luitieron un detenido estudio comparativo de las mandíbulas, maxilas, parapodios, etc.
The factors responsible for determining the host-plants and feeding sites of aphids, and the various probing activities (the role of the labium, stylet insertion, surface saliva deposition, the behaviour of the aphid, virus transmission) are examined. There is a brief review of stylet structure and movement and the possible sensory nature of these organs, followed by a detailed review of the characteristics of aphid stylet paths in plant tissues. The penetration of epidermis and vascular tissues is treated separately while that within the intermediate tissues is covered in relation to leaves and stems, roots, trees, galls and excised tissue as well as in separate sections on Aphis fabae Scopoli and Myzus persicae (Sulzer). Stylet destinations and behaviour in the sieve tubes are discussed together with general features such as rate and depth of penetration, guidance to the feeding site, effects of tissue hardness and stylet withdrawal. The ingestion rate of plant sap is reviewed and its constitution and importance examined together with the significance of artificial diets. The salivary secretions including sheaths and tracks, their functions and their role in the transference of material between aphid and host are dealt with. The nature of the physical and internal damage resulting from aphid feeding is briefly covered, and also some plant-insect interrelations. The aphid species whose stylets have been examined in plant tissue are listed.