The University of South Florida, also known as USF, is a member institution of the State University System of Florida, one of the state's three flagship universities for public research, and is located in Tampa, Florida, USA. Founded in 1956, USF is the eighth largest university in the nation and the third largest in the state of Florida, with a total enrollment of 47,122 as of 2009. USF has an autonomous campus in St. Petersburg, and branch centers in Sarasota and Lakeland. Wikipedia.
Breitbart M.,University of South Florida
Annual Review of Marine Science | Year: 2012
Over the past two decades, marine virology has progressed from a curiosity to an intensely studied topic of critical importance to oceanography. At concentrations of approximately 10 million viruses per milliliter of surface seawater, viruses are the most abundant biological entities in the oceans. The majority of these viruses are phages (viruses that infect bacteria). Through lysing their bacterial hosts, marine phages control bacterial abundance, affect community composition, and impact global biogeochemical cycles. In addition, phages influence their hosts through selection for resistance, horizontal gene transfer, and manipulation of bacterial metabolism. Recent work has also demonstrated that marine phages are extremely diverse and can carry a variety of auxiliary metabolic genes encoding critical ecological functions. This review is structured as a scientific "truth or dare," revealing several well-established "truths" about marine viruses and presenting a few "dares" for the research community to undertake in future studies. Copyright © 2012 by Annual Reviews. All rights reserved.
Batzill M.,University of South Florida
Surface Science Reports | Year: 2012
Graphene, a single atomic layer of sp 2 hybridized carbon, exhibits a zero-band gap with linear band dispersion at the Fermi-level, forming a Dirac-cone at the K-points of its Brillouin zone. In this review, we focus on basic materials science issues of this intriguing material. The scope of this work is further narrowed by concentrating on graphene grown at transition metal surfaces, mostly under vacuum conditions, and neglecting other graphene synthesis approaches, namely growth on SiC or by graphene oxide reduction. Thus one large section of this review focuses on metal/graphene interfaces. We summarize recent surface science studies on the structure, interaction, and the growth of graphene on various metals. Metal supported graphene is a recurring theme throughout this review as it provides model-systems for studying adsorption and graphene modifications on well-defined, large area samples, and thus is ideal for employing surface science techniques. Other aspects of graphene are also reviewed. Approaches for creating and characterizing graphene nanostructures, in particular graphene nanoribbons, are discussed. Graphene nanoribbons play an important role for potential electronic applications because the lateral electron confinement in the ribbons opens a band-gap in graphene. Materials issues of nanoribbons, like formation of well-defined edges are introduced. Atomic-scale defect-structures in graphene are another topic. The known defect structures in graphene are categorized and atomic scale characterization of these defects by scanning tunneling microscopy (stocktickerSTM) and high resolution transmission electron microscopy (TEM) is illustrated. Important for applications of graphene is our ability of modifying its properties. Therefore, studies of substitutional doping of graphene with nitrogen or boron, hydrogenation or fluorination of graphene, and the adsorption of molecules with strong electron affinity are included in this review. This review is restricted to a summary of surface science studies on well-ordered systems. Other important graphene research areas such as transport measurements on pure and modified graphene are not included. The goal of this review is to give a concise overview of the materials science of graphene from the surface science perspective. © 2011 Elsevier B.V. All rights reserved.
Kim M.K.,University of South Florida
Optics Express | Year: 2013
Full-color, three-dimensional images of objects under incoherent illumination are obtained by a digital holography technique. Based on selfinterference of two beam-split copies of the object's optical field with differential curvatures, the apparatus consists of a beam-splitter, a few mirrors and lenses, a piezo-actuator, and a color camera. No lasers or other special illuminations are used for recording or reconstruction. Color holographic images of daylight-illuminated outdoor scenes and a halogen lamp-illuminated toy figure are obtained. From a recorded hologram, images can be calculated, or numerically focused, at any distances for viewing. © 2013 Optical Society of America.
Gregor S.,Australian National University |
Hevner A.R.,University of South Florida
MIS Quarterly: Management Information Systems | Year: 2013
Design science research (DSR) has staked its rightful ground as an important and legitimate Information Systems (IS) research paradigm. We contend that DSR has yet to attain its full potential impact on the development and use of information systems due to gaps in the understanding and application of DSR concepts and methods. This essay aims to help researchers (1) appreciate the levels of artifact abstractions that may be DSR contributions, (2) identify appropriate ways of consuming and producing knowledge when they are preparing journal articles or other scholarly works, (3) understand and position the knowledge contributions of their research projects, and (4) structure a DSR article so that it emphasizes significant contributions to the knowledge base. Our focal contribution is the DSR knowledge contribution framework with two dimensions based on the existing state of knowledge in both the problem and solution domains for the research opportunity under study. In addition, we propose a DSR communication schema with similarities to more conventional publication patterns, but which substitutes the description of the DSR artifact in place of a traditional results section. We evaluate the DSR contribution framework and the DSR communication schema via examinations of DSR exemplar publications.
Miller L.W.,University of South Florida
Circulation | Year: 2011
There is a real need for better therapeutic options for patients with advanced HF to reduce the very impaired quality of life of these patients and the significant personal and economic impact of recurrent hospitalizations. A substantial number of patients could benefit from this therapy who are not currently being referred or considered for LVAD therapy for the variety of reasons detailed above, but primarily because of a lack of familiarity by physicians with current outcomes with LVAD therapy and risk factors for mortality in these patients. Significant expansion of this therapy seems to be both needed and warranted, but it must be supported by randomized trials. © 2011 American Heart Association, Inc.