This includes, but is not limited to, students, museum curators, designers, journalists, and academics in a number of fields, as well as independent researchers. The aim of this event, which the organisers hope will become an annual fixture in the calendar, is to create a space for those actively engaged in research into dress and textile history to present new work, and to promote awareness of the diversity and vitality of the field. The event is deliberately unthemed to allow for a wide variety of research to be presented. Society for Renaissance Studies:
For a typical small molecule e. Bacteria that do induce currents for their benefit e. Another postulated function of primitive motility, swimming for the sake of running into more molecules, also does not work: Thus, if diffusion of molecules into the cell is the only matter of concern, a bacterium will do just as well by sitting still as it will by stirring or swimming.
The reason bacteria swim is not to increase diffusion but to find locations with a higher local concentration of nutrient molecules Purcell, ; Berg, ; Vogel, However, a typical value for a is 0. Thus, fundamental physical considerations make the hypothesized stirring filament an unlikely intermediate.
Similarly, Rizzotti implies that the F0-c subunit is homologous with the flagellar motor proteins MotAB, but sequence homology has instead been discovered homology between MotAB and a phylogenetically widespread family of proteins that couple protonmotive force to diverse membrane transport processes.
The homologies could be explained by invoking additional independent cooption events, but this would require a rather more complex scenario than that presented by Rizzotti.
Therefore several of the ideas proposed here have been previously raised in informal debates about flagellar evolution. Millerand Musgrave review this aspect of the debate in detail, and Musgrave proposes a model that is similar in outline to that presented here, although his account is more general.
Phylogenetic context and assumed starting organism The paradigm for prokaryote phylogeny, if there is one, is the universal rRNA tree. This shows a number of widely separated bacterial lineages, with archaea and eukaryotes separated from them all by a very long branch.
This tree is unrooted, and many possible rootings have been proposed in the literature. As these are the most remote and difficult phylogenetic events it is possible to study, and as there is by definition no outgroup to life in general, the debate can be expected to continue for some time.
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For current purposes the most important point is that flagella are widespread across the bacterial phylogenetic tree, with losses in various taxa and no clearly primitive nonflagellate taxa. It is therefore assumed that flagella evolved near the base of the bacterial tree.
Rizzotti and others e. However, the very general consideration that most of the bacterial phyla are gram negative, including the many different taxa that come out as basal on different analyses, weighs against this hypothesis.
Therefore, we shall side with Cavalier-Smith, who argues that the last common ancestor was gram-negative. He has put forward the most detailed model for the origin of bacteria and the double membrane Cavalier-Smith, a, a.
The model thus begins with a generic double-membraned, gram-negative bacterium.Crossing the Chasm: Marketing and Selling High-Tech Products to Mainstream Customers or simply Crossing the Chasm (, revised and ), is a marketing book by Geoffrey A.
Moore that focuses on the specifics of marketing high tech products during the early start up period. Moore's exploration and expansion of the diffusions of . Research on social innovation has gained momentum over the last decade, spurred notably by the growing interest in social issues related to management, entrepreneurship, and public management.
In social dynamics, critical mass is a sufficient number of adopters of an innovation in a social system so that the rate of adoption becomes self-sustaining and creates further growth.
The term is borrowed from nuclear physics and in that field it refers to the amount of a substance needed to sustain a chain reaction. Social factors influencing critical mass . Innovation Diffusion Framework-Policy Adoption Words | 6 Pages.
Question 1: Innovation Diffusion Framework-Policy Adoption Policy diffusion is the study of policy adoption and why state and national governments make certain decisions that they make, and . Turnitin provides instructors with the tools to prevent plagiarism, engage students in the writing process, and provide personalized feedback.
Three essays on social networks and the diffusion of innovation models Tae-Hyung Pyo University of Iowa THREE ESSAYS ON SOCIAL NETWORKS AND THE DIFFUSION OF INNOVATION MODELS.
by. Tae-Hyung Pyo. A thesis submitted in partial fulfillment.