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We developed a mean field, metapopulation model to study the consequences of habitat destruction on a predator-prey interaction. The model complements and extends earlier work published by Bascompte and Solé (1998, J. theor. Biol.195, 383-393) in that it also permits use of alternative prey (i.e., resource supplementation) by predators. The current model is(More)
677 The consequences of delegation to independent agencies: Separation of powers, discursive governance and the regulation of telecommunications in Germany Abstract. Whereas the delegation of regulatory powers is usually examined from the prin-cipal's perspective, this article explores the consequences of delegation for the regulatory output. Empirically,(More)
RESEARCH QUESTIONS To investigate how the daily physical activities of elderly patients can be enhanced by systematic counselling conducted by general practitioners (GPs). METHODS In this feasibility study with pre-post design, 29 people (14 females, mean age 72.2 years, SD = 6.1) were enrolled during routine visits by two general practitioners. A(More)
BACKGROUND Few empirical data exist on the impact of preventive human immunodeficiency virus (HIV) interventions on intended and actual sexual behavior of international tourists. The present cross-sectional study is based on a 2 3 2 design. METHODS The sample consisted of departing and arriving passengers (n = 3100) at Zurich Airport with destinations in(More)
Adolescents' perceptions of family relationships were studied using the FAST, a spatial technique in which wooden figures were placed on a board to represent cohesion and power. 150 subjects, drawn equally from sixth, ninth, and twelfth grades, portrayed the family in 2 representations: as perceived typically and ideally. Father-mother, father-child, and(More)
All rights reserved. No part of this book may be reproduced in any form by any electronic or mechanical means (including photocopying, recording, or information storage and retrieval) without permission in writing from the publisher. MIT Press books may be purchased at special quantity discounts for business or sales promotional use. Institutional(More)
To develop and test a counselling programme based on the Transtheoretical Model of behavioural change, for promoting exercise in people over the age of 65. The sample (n  =  448) consisted of women and men aged between 65 and 92, recruited from Swiss GPs’ practices between 2000 and 2004. After a baseline measurement (T1) and an initial counselling session,(More)