25 research outputs found
Generation of phase-coherent states
An interaction scheme involving nonlinear media is suggested for
the generation of phase-coherent states (PCS). The setup is based on parametric
amplification of vacuum followed by up-conversion of the resulting twin-beam.
The involved nonlinear interactions are studied by the exact numerical
diagonalization. An experimentally achievable working regime to approximate PCS
with high conversion rate is given, and the validity of parametric
approximation is discussed.Comment: To appear in PRA -- More info at http://enterprise.pv.infn.it
Untersuchung von Entscheidungsablaeufen bei der Abklaerung von Problempatienten am Beispiel Rueckenschmerzen. - Und Nachfolgeprojekt: Diskussion der gewonnenen Diagnoseschemata mit dem niedergelassenen Arzt - Akzeptanzanalyse
Research project: data processing in the Public HealthSIGLECopy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman
Behavioural adaptations of argulid parasites (Crustacea: Branchiura) to major challenges in their life cycle
Fish lice (Argulus spp.) are obligate ectoparasites, which contrary to most aquatic parasites, retain the ability to swim
freely throughout the whole of their life. In fish farms, they can quickly increase in numbers and without effective
control cause argulosis, which results in the reduced growth and survival of their fish hosts. The morphology of
Argulus spp, including their sensory organs, is suitable for both parasitism and free-swimming. By spending a
considerable amount of time away from their host, these parasites risk being excessively dispersed, which could
endanger mating success. Here we present a review of recent studies on the behaviour of Argulus spp, especially
the aggregative behaviour that mitigates the dilution of the parasite population. Aggregation of parasites, which is
especially important during the period of reproduction, occurs on different scales and involves both the
aggregation of the host and the aggregation of the parasites on the host. The main behavioural adaptations of
Argulus spp, including searches for hosts and mates, host manipulation and host choice, are all focused on the fish.
As these ectoparasites repeatedly change hosts and inflict skin damage, they can act as vectors for fish pathogens.
The development of environmentally friendly measures for the control and prevention of argulosis needs to take
into account the behaviour of the parasites.peerReviewe