freely distributed and have been invaluable resources Rosa Beddington died on May 18, 2001; she was to the community. just 45. Rosa moved again, in 1993, to take up the position Rosa was an embryologist of the greatest distinction; of Head of the Division of Mammalian Development at she had extraordinary technical skills, a piercing intellithe Medical Research Council’s National Institute for g...

In the late-twentieth century in the United States, Catherine DeAngelis was a pediatric physician, researcher, and editor of multiple medical journals. During her time with the Journal of the American Medical Association [2], DeAngelis became the journal?s first female editor. At Johns Hopkins University [3] in Baltimore, Maryland, she studied how physician-nurse interactions affected patient c...

The histogenetic and neoplastic potentials of defined regions of the 8th day mouse embryonic egg cylinder were examined following ectopic transfer to beneath the testis capsule. No differences in histogenetic potential were detected between anterior and posterior slices of the embryo, either when composed of all three germ layers or of embryonic ectoderm alone. Small anterior and distal fragmen...

INTRODUCTION In the last two decades the molecular analysis of axis induction and embryonic patterning has provided a blueprint for body axis formation and organizer function in several species, including amphibians, chicken, zebrafish and mouse (Arnold and Robertson, 2009; De Robertis et al., 2000; Niehrs, 2004; Nowotschin and Hadjantonakis, 2010). In the mouse, the anterior-posterior (A-P) ax...

We investigate the long-term web structure emerging in evolutionary food web models when different types of functional responses are used. We find that large and complex webs with several trophic layers arise only if the population dynamics is such that it allows predators to focus on their best prey species. This can be achieved using modified Lotka-Volterra or Holling/Beddington functional re...

This paper is concerned with a diffusive predator-prey model with BeddingtonDeAngelis functional response under Robin boundary conditions. We establish the existence and nonexistence of coexistence solutions and give some sufficient and necessary conditions. In addition, the stability of coexistence solutions is investigated. Furthermore, the extinction and permanence of time-dependent system a...

Background: What are now increasingly called individual based models (IBMs) have been used in ecology since the 1970s when theoretical ecology began in earnest. The best known examples from that time include the forest computer simulation model (named JABOWA) of Daniel Botkin (Botkin et al 1972) and the computer simulation model of Donald DeAngelis (DeAngelis et al 1991) for a freshwater fish c...

One of the grand challenges for society is global security in food and nutrition. The ‘‘perfect storm’’ metaphor has been used by Sir John Beddington to describe the scenario that wemight be heading for, with simultaneous shortages for food, water, and energy within the foreseeable future. This Select highlights the need for a truly multipronged approach across scientific disciplines and countr...