This study, split into three parts, describes the behavioural changes in eight adult gorillas (Gorilla gorilla gorilla) housed at several European zoos, in response to environmental manipulations. These manipulations were aimed at encouraging more normal behaviour in captive gorillas, by increasing the complexity of food presentation (hiding food in plastic tubes, in holes, in woodwool, etc). I...

A new detection system, the magnetic immuno-polymerase chain reaction (PCR) assay (MIPA) has been developed to detect Listeria monocytogenes in food. This method separates Listeria cells from PCR-inhibitory factors present in enrichment broths containing food samples by using magnetic beads coated with specific monoclonal antibodies (MAbs). The separated bacteria were lysed, and the supernatant...

Predators can have positive impacts on their prey through such mechanisms as nutrient mineralization and prey transport. These positive feedbacks have the potential to change predictions based on food web theory, such as the assertion that enrichment is destabilizing. We present a model of a simple food web, consisting of a resource, a consumer, and its predator. We assume that the predator has...

The detection of Listeria monocytogenes from food is currently carried out using a double enrichment. For the ISO methodology, this double enrichment is performed using half-Fraser and Fraser broths, in which the overgrowth of L. innocua can occur in samples where both species are present. In this study, we analyzed the induction of phages and phage tails of Listeria spp. in these media and in ...

Abstract Behavior gives valuable information for tiger’s management care. Tigers may perform stereotypic behavior as coping mechanism or stress in captivity. Enrichment techniques can reduce those behavior. This research aims to evaluate food and environmental enrichment on Sumatran tiger. Four tigers were observed by focal animal sampling (from 08.00 a.m. 12.00 01.00 p.m. 05.00 p.m.) at Tambli...

Development of monoclonal antibody based sandwich ELISA for rapid detection of Salmonella and optimization of enrichment procedures to increase the sensitivity. Spleen cells from Balb/c mice immunized with flagellin (H=d) antigen of S. typhi were fused with NSO myeloma clones for preparation of mAbs and New Zealand rabbits were used to produce polyclonal antibody. Different enrichment broths we...