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2005

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Time Dimension For Business News In The Knowledge Warehouse, Pawel J. Kalczynski Jan 2005

Time Dimension For Business News In The Knowledge Warehouse, Pawel J. Kalczynski

Journal of International Technology and Information Management

This paper proposes a data structure to support the integration of business news and data in the knowledge warehouse using the Temporal Document Retrieval Model (TDRM). Temporal document retrieval takes into account the time context expressed as temporal phrases in the document content. The maintenance and scalability of the proposed data cluster is discussed. The results of temporal document retrieval experiments based on typical and ad-hoc time constraints, performed on a large corpus of business news are reported. The experiments showed that the instantaneous TDRM-based retrieval using the proposed cluster is possible with the currently available database technology and confirmed …

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A Framework For Describing And Classifying Multicriteria Portfolio Selection Problems: An Object-Oriented Approach, Heinz Roland Weistroffer, Charles H. Smith Jan 2005

A Framework For Describing And Classifying Multicriteria Portfolio Selection Problems: An Object-Oriented Approach, Heinz Roland Weistroffer, Charles H. Smith

Journal of International Technology and Information Management

Many decisions require not a single solution alternative, but a set or portfolio of alternatives. For example, a business generally produces not a single product, but a portfolio of products, and a project is tackled not by a single individual, but by a team of individuals. Unfortunately, the portfolio selection problem has been largely neglected in the literature. Though many specific problem environments have been discussed using heuristic, ad hoc methods, no general methodology or theory has been developed. This paper proposes an object-oriented framework to provide a theoretical foundation for future research on the portfolio selection problem.

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Uml Activity Diagram Semantics And Automated Gui Prototyping, Nancy Winniford Ashley, Timothy E. Meehan, Norman Carr Jan 2005

Uml Activity Diagram Semantics And Automated Gui Prototyping, Nancy Winniford Ashley, Timothy E. Meehan, Norman Carr

Journal of International Technology and Information Management

Extended Activity Semantics (XAS) is a notation which can be used with Unified Modeling Language (UML) activity diagrams to specify user interactions with a system and to automatically generate a prototype of the graphical user interface (GUI) that would be used in these interactions. XAS has been incorporated in a CASE tool, Guibot, which has been developed as a plug-in for Rational Rose, a leading UML tool. The notation and tool address a specific gap in UML – the inability to model user interaction.

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Internet Technology In 2010: The Issue Of Ipv6 Adoption In The U.S.A., Garry L. White, Jaymeen R. Shah, James R. Cook Jan 2005

Internet Technology In 2010: The Issue Of Ipv6 Adoption In The U.S.A., Garry L. White, Jaymeen R. Shah, James R. Cook

Journal of International Technology and Information Management

Computer industry literature suggests that IPv4 Internet addresses are likely to have been depleted by the year 2010, and at least Asia and Europe will be using the new IPv6 Internet addresses. Literature also suggests that the U.S.A. is lagging behind Asia and Europe with the implementation of IPv6. Empirical data supporting the fact that the U.S.A. is lagging behind is not available in the literature. This paper presents the issues regarding IPv6, reasons why Asia and Europe are implementing IPv6, and why the U.S.A. is lagging behind. Empirical data is presented to support the literature’s suggestion that the U.S.A. …

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A Critical Time For Ultra-Wide Band, Gary F. Templeton, Mark B. Schmidt Jan 2005

A Critical Time For Ultra-Wide Band, Gary F. Templeton, Mark B. Schmidt

Journal of International Technology and Information Management

Ultra-wideband (UWB) is a promising class of high-speed wireless communications applications that is projected to significantly change local and wide area network architectures. This article describes the technology, its probable application areas, the environmental forces that are constraining and enabling commercialization, and the prospects for short-term growth for UWB services. Commercial sale and distribution of UWB products has been approved, and widespread sale is expected by 2007.

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The Road To Erp Success: Understanding End-User Perceptions, Asli Yagmur Akbulut, Jaideep Motwani Jan 2005

The Road To Erp Success: Understanding End-User Perceptions, Asli Yagmur Akbulut, Jaideep Motwani

Journal of International Technology and Information Management

Even though there is a growing body of literature that focuses on improving the success rate of enterprise resource planning (ERP) projects, there is a lack of research aimed at understanding end- users perceptions of ERP systems. Given that employee expectations and attitudes play an important role in the success of ERP projects, the purpose of this study is to gain a deeper understanding of end-user perceptions of ERP systems. In order to achieve this objective, we provide empirical evidence from two companies that have recently implemented ERP systems. We also offer strategies that could be utilized by managers, project …

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A Methodology For Evaluating Data And Output Misfits In Commercial Off-The-Shelf Erp Systems, Jen-Her Wu, Chang-Tseh Hsieh, Shin-Shing Shin, Chi-Cheng Wu Jan 2005

A Methodology For Evaluating Data And Output Misfits In Commercial Off-The-Shelf Erp Systems, Jen-Her Wu, Chang-Tseh Hsieh, Shin-Shing Shin, Chi-Cheng Wu

Journal of International Technology and Information Management

This paper presents a methodology based on the task-technology fit theory to identify data and output misfits in the ex-ante evaluation of an off-the shelf enterprise resources planning (ERP) package. The proposed methodology consists of two stages: output misfit analysis and data misfit analysis. The purpose of the first stage is to identify corresponding field (output misfits) and data glossary for data misfit analysis. The latter stage identifies data misfits for every corresponding activity in the business process sequence. The proposed methodology provides a systematic approach to alleviate the difficulty and complexity in identifying data and output misfits. The identification …

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Applying Theoretical Frameworks To Explicate Physician Acceptance Of Computerized Physician Order Entry (Cpoe), David Rosenthal, Elaine Seeman, Shanan Gibson Jan 2005

Applying Theoretical Frameworks To Explicate Physician Acceptance Of Computerized Physician Order Entry (Cpoe), David Rosenthal, Elaine Seeman, Shanan Gibson

Journal of International Technology and Information Management

This paper reports the findings of a pilot study undertaken to ascertain the feasibility of incorporating the Theory of Planned Behavior and the Taxonomy of Work Values into the explanation of physician technology acceptance of a new organizational technology – Computerized Physician Order Entry (CPOE). While Davis’s Technology Acceptance Model has received much empirical support, we posit that certain complexities associated with the physician population and the hospital environment warrant the inclusion of other theoretical models as a means of furthering our understanding of technology acceptance. Although preliminary in nature, this study finds support for the inclusion of both the …

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Review Of Aerospace Marketing Management, By Philippe Malaval And Christophe Bénaroya, Frans G. Von Der Dunk Jan 2005

Review Of Aerospace Marketing Management, By Philippe Malaval And Christophe Bénaroya, Frans G. Von Der Dunk

Space, Cyber, and Telecommunications Law Program: Faculty Publications

From time to time, especially among space lawyers, discussion flares up on the wisdom of treating air law and space law as similar branches of law, and on the justification for teaching and doing research on both at the same venues and in the same contexts. Whatever the merits of keeping a keen eye on the particularities of the two legal fields, however, one should never loose sight of the fact that space law is intricately linked to issues not only of space policy, but also of economics and technology, and that the worlds of aviation and the space industry …

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Effects Of A Prereading Intervention On The Literacy And Social Skills Of Children, J. Ron Nelson, Scott A. Stage, Michael H. Epstein, Corey D. Pierce Jan 2005

Effects Of A Prereading Intervention On The Literacy And Social Skills Of Children, J. Ron Nelson, Scott A. Stage, Michael H. Epstein, Corey D. Pierce

Department of Special Education and Communication Disorders: Faculty Publications

This study investigated the effects of an intensive prereading intervention on the beginning reading skills and social behavior of kindergarten children at risk for behavioral disorders and reading difficulties. Children identified through a systematic screening process were assigned randomly to experimental or nonspecific treatment conditions. Children who received the intensive prereading intervention showed statistically and educationally significant gains in their beginning reading skills relative to their counterparts in the nonspecific treatment condition. In contrast, improvements in teacher ratings of the classroom competence, emotional and behavioral self-control, and self-confidence of children in the experimental and nonspecific treatment conditions were not statistically …

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Individual, Congregational, And Denominational Effects On Church Members’ Civic Participation, Philip Schwadel Jan 2005

Individual, Congregational, And Denominational Effects On Church Members’ Civic Participation, Philip Schwadel

Department of Sociology: Faculty Publications

Previous research demonstrates two aspects of religion that affect civic activity—church participation and religious conservatism. Conservative religious beliefs and membership in conservative denominations are often associated with low levels of civic activity while church participation is said to increase civic activity. This article advances the discussion of the relationship between religion and civic participation by introducing the congregational context. Data from the 1987 Church and Community Planning Inventory show that congregations vary in their members’ civic activity—congregational factors associated with conservative Christianity (high levels of biblical literalism and within-church friendships) are strongly and negatively associated with church members’ activity in …

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Teacher Factors Associated With Preschool Teacher–Child Relationships: Teaching Efficacy And Parent–Teacher Relationships, Li-Chuan Chung, Christine Marvin, Susan Churchill Jan 2005

Teacher Factors Associated With Preschool Teacher–Child Relationships: Teaching Efficacy And Parent–Teacher Relationships, Li-Chuan Chung, Christine Marvin, Susan Churchill

Department of Special Education and Communication Disorders: Faculty Publications

The present study investigated specific teacher factors that potentially influence teacher–child relationships with preschool-age children. One demographic questionnaire and three rating scales were used to survey 152 head teachers of 3–6-year-old children in community-based childcare and preschool centers in one midwestern state. There were 46 teachers who reported on their relationship with a child with a disability or concerning developmental delay. Positive correlations were found between teacher–child relationships and the teachers’ educational backgrounds, self-reported teaching efficacy, and parent–teacher relationships. The parent–teacher relationship appeared to be the strongest teacher-related factor predicting the quality of teacher–child relationships. Compared to other teachers, the …

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Modifications Of Human Βa1/Βa3-Crystallins Include S-Methylation, Glutathiolation, And Truncation, Veniamin N. Lapko, Ronald Cerny, David L. Smith, Jean B. Smith Jan 2005

Modifications Of Human Βa1/Βa3-Crystallins Include S-Methylation, Glutathiolation, And Truncation, Veniamin N. Lapko, Ronald Cerny, David L. Smith, Jean B. Smith

Ronald Cerny Publications

Disulfide bonding of lens crystallins contributes to the aggregation and insolubilization of these proteins that leads to cataract. A high concentration of reduced glutathione is believed to be key in preventing oxidation of crystallin sulfhydryls to form disulfide bonds. This protective role is decreased in aged lenses because of lower glutathione levels, especially in the nucleus. We recently found that human [1]-crystallins undergo S-methylation at exposed cysteine residues, a reaction that may prevent disulfide bonding. We report here that βA1/A3-crystallins are also methylated at specific cysteine residues and are the most heavily methylated of the human lens crystallins. Among the …

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Effects Of Endogenous Steroid Hormone Levels On Annual Survival In Cliff Swallows, Charles R. Brown, Mary Bomberger Brown, Samrrah A. Raouf, Linda C. Smith, John C. Wingfield Jan 2005

Effects Of Endogenous Steroid Hormone Levels On Annual Survival In Cliff Swallows, Charles R. Brown, Mary Bomberger Brown, Samrrah A. Raouf, Linda C. Smith, John C. Wingfield

School of Biological Sciences: Faculty Publications

The hormone corticosterone is an important part of animals’ response to environmental stress, modulating short-term adaptive changes in behavior and physiology. The hormone testosterone is also critical, especially for males, in regulating the expression of sexual behavior and parental care. These hormones can have costly consequences, however, and within populations individuals show variation in endogenous levels of both corticosterone and testosterone. We studied how annual survival varied as a function of natural levels of these hormones in colonially breeding Cliff swallows (Petrochelidon pyrrhonota) in southwestern Nebraska, USA, in 2000–2003. We sampled hormone levels of birds caught at colonies …

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Testosterone And Group Size In Cliff Swallows: Testing The “Challenge Hypothesis” In A Colonial Bird, Linda C. Smith, Samrrah A. Raouf, Mary Bomberger Brown, John C. Wingfield, Charles R. Brown Jan 2005

Testosterone And Group Size In Cliff Swallows: Testing The “Challenge Hypothesis” In A Colonial Bird, Linda C. Smith, Samrrah A. Raouf, Mary Bomberger Brown, John C. Wingfield, Charles R. Brown

School of Biological Sciences: Faculty Publications

The “challenge hypothesis” states that increases in testosterone levels of male animals during the breeding season are directly related to the extent of intrasexual competition for resources or mates that they experience. Although often tested in territorial species, the challenge hypothesis has not been evaluated for colonial animals that live in groups of different sizes and that thus experience different intensities of intrasexual competition. We measured circulating testosterone levels of male and female cliff swallows (Petrochelidon pyrrhonota) in southwestern Nebraska, where these birds nest in colonies of widely different sizes. Males had significantly higher testosterone levels than females, …

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Algebraic Isomorphisms And Spectra Of Triangular Limit Algebras: Erratum, Allan P. Donsig, David R. Pitts, S. C. Power Jan 2005

Algebraic Isomorphisms And Spectra Of Triangular Limit Algebras: Erratum, Allan P. Donsig, David R. Pitts, S. C. Power

Department of Mathematics: Faculty Publications

We have found an error in the proof of Theorem 4.1 in [2]. This error affects only Theorems 4.1 and 4.3. As we have been unable to find an alternative proof of Theorem 4.1, we do not know if these theorems are true in full generality. Restricted to limit algebras generated by their order-preserving normalizers, the proof is correct. The theorems are known to be true in this case by somewhat different methods [1].

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Reversals And Transpositions Over Finite Alphabets, A. J. Radcliffe, A. D. Scott, E. L. Wilmer Jan 2005

Reversals And Transpositions Over Finite Alphabets, A. J. Radcliffe, A. D. Scott, E. L. Wilmer

Department of Mathematics: Faculty Publications

Extending results of Christie and Irving, we examine the action of reversals and transpositions on finite strings over an alphabet of size k. We show that determining reversal, transposition, or signed reversal distance between two strings over a finite alphabet is NP-hard, while for “dense” instances we give a polynomial-time approximation scheme. We also give a number of extremal results, as well as investigating the distance between random strings and the problem of sorting a string over a finite alphabet.

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The Psychological Capital Of Chinese Workers: Exploring The Relationship With Performance, Fred Luthans, Bruce Avolio, Fred Walumbwa, Weixing Li Jan 2005

The Psychological Capital Of Chinese Workers: Exploring The Relationship With Performance, Fred Luthans, Bruce Avolio, Fred Walumbwa, Weixing Li

Department of Management: Faculty Publications

Everyone knows about China’s huge population and the fast-growing economy. Although macro-level sociological and economic analyses have given some attention to the linkage between the two, at the micro level, the relationship between human resources and, more specifically, psychological capital of Chinese workers and their performance has been largely ignored. Within the context of three factories (two private and one state-owned) in the People’s Republic of China, this exploratory study examined the relationship of a sample (n=422) of Chinese workers’ positive psychological capital states and their performance. Results indicated the workers’ positive states of hope, optimism, and resiliency, separately and …

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“Can You See The Real Me?” A Self-Based Model Of Authentic Leader And Follower Development, William L. Gardner, Bruce J. Avolio, Fred Luthans, Douglas R. May, Fred Walumbwa Jan 2005

“Can You See The Real Me?” A Self-Based Model Of Authentic Leader And Follower Development, William L. Gardner, Bruce J. Avolio, Fred Luthans, Douglas R. May, Fred Walumbwa

Department of Management: Faculty Publications

To address present and future leadership needs, a model of authentic leader and follower development is proposed and examined with respect to its relationship to veritable, sustainable follower performance. The developmental processes of leader and follower self-awareness and self-regulation are emphasized. The influence of the leader’s and followers’ personal histories and trigger events are considered as antecedents of authentic leadership and followership, as well as the reciprocal effects with an inclusive, ethical, caring and strength-based organizational climate. Positive modeling is viewed as a primary means whereby leaders develop authentic followers. Posited outcomes of authentic leader–follower relationships include heightened levels of …

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Global Warming Is Changing The Dynamics Of Arctic Host-Parasite Systems, S. J. Kutz, Eric P. Hoberg, L. Polley, E. J. Jenkins Jan 2005

Global Warming Is Changing The Dynamics Of Arctic Host-Parasite Systems, S. J. Kutz, Eric P. Hoberg, L. Polley, E. J. Jenkins

Harold W. Manter Laboratory of Parasitology: Faculty Publications

Global climate change is altering the ecology of infectious agents and driving the emergence of disease in people, domestic animals, and wildlife. We present a novel, empirically based, predictive model for the impact of climate warming on development rates and availability of an important parasitic nematode of muskoxen in the Canadian Arctic, a region that is particularly vulnerable to climate change. Using this model, we show that warming in the Arctic may have already radically altered the transmission dynamics of this parasite, escalating infection pressure for muskoxen, and that this trend is expected to continue. This work establishes a foundation …

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Trichinella Pseudospiralis From A Wild Pig In Texas, H. Ray Gamble, E. Pozio, J. Ralph Lichtenfels, D. S. Zarlenga, D. E. Hill Jan 2005

Trichinella Pseudospiralis From A Wild Pig In Texas, H. Ray Gamble, E. Pozio, J. Ralph Lichtenfels, D. S. Zarlenga, D. E. Hill

Harold W. Manter Laboratory of Parasitology: Faculty Publications

In December 2001, the routine inspection of a wild boar intended for human consumption revealed the presence of Trichinella ssp. larvae. Biological, morphological and genetic analyses demonstrated the parasite to be Trichinella pseudospiralis. This is the second report of T. pseudospiralis in the United States and the first report of the parasite in a food animal species in the U.S.

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Caudal Polymorphism And Cephalic Morphology Among First-Stage Larvae Of Parelaphostrongylus Odocoilei (Protostrongylidae: Elaphostrongylinae) In Dall’S Sheep From The Mackenzie Mountains, Canada, Eric P. Hoberg, Emily J. Jenkins, Benjamin Rosenthal, Mayee Wong, Eric F. Erbe, Susan J. Kutz, Lydden Polley Jan 2005

Caudal Polymorphism And Cephalic Morphology Among First-Stage Larvae Of Parelaphostrongylus Odocoilei (Protostrongylidae: Elaphostrongylinae) In Dall’S Sheep From The Mackenzie Mountains, Canada, Eric P. Hoberg, Emily J. Jenkins, Benjamin Rosenthal, Mayee Wong, Eric F. Erbe, Susan J. Kutz, Lydden Polley

Harold W. Manter Laboratory of Parasitology: Faculty Publications

We demonstrate polymorphism in the structure of the tail among first-stage larvae of Parelaphostrongylus odocoilei (Protostrongylidae). Two distinct larvae, both with a characteristic dorsal spine, include (1) a morphotype with a kinked conical tail marked by three distinct transverse folds or joints and a symmetrical terminal tail spike and (2) a morphotype with a digitate terminal region lacking folds or joints and with an asymmetrical, subterminal tail spike. These divergent larval forms had been postulated as perhaps representing distinct species of elaphostrongyline nematodes. Application of a multilocus approach using ITS-2 sequences from the nuclear genome and COX-II sequences from the …

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Phylogeny For Genera Of Nematodirinae (Nematoda: Trichostrongylina), Eric P. Hoberg, J. Ralph Lichtenfels, Lora G. Rickard Jan 2005

Phylogeny For Genera Of Nematodirinae (Nematoda: Trichostrongylina), Eric P. Hoberg, J. Ralph Lichtenfels, Lora G. Rickard

Harold W. Manter Laboratory of Parasitology: Faculty Publications

Monophyly for the Nematodirinae, with five genera, Murielus, Rauschia, Nematodiroides, Nematodirus, and Nematodirella was confirmed based on comparative morphology and phylogenetic analysis of structural characters. This concept for the nematodirines excludes the monotypic Lamanema chavezi, but otherwise corroborates generic-level diversity as defined in prior studies. Exhaustive analysis resulted in one most parsimonious tree (36 steps; consistency index [CI] = 0.94; retention index [RI] = 0.93; excluding phylogenetically uninformative characters, CI = 0.92). As an inclusive or monophyletic group, Nematodirinae was diagnosed by eight synapomorphies (seven are unequivocal): (1) large eggs, (2) long filiform spicules, (3) basal division of …

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Beringia: Intercontinental Exchange And Diversification Of High Latitude Mammals And Their Parasites During The Pliocene And Quarternary, Joseph A. Cook, Eric P. Hoberg, Anson Koehler, Heikki Henttonen, Lotta Wickström, Voitto Haukisalmi, Kurt Galbreath, Felix Chernyavski, Nikolai Dokuchaev, Anatoli Lahzuhtkin, Stephen O. Macdonald, Andrew Hope, Eric Waltari, Amy Runck, Alasdair Veitch, Richard Popko, Emily Jenkins, Susan Kutz, Ralph Eckerlin Jan 2005

Beringia: Intercontinental Exchange And Diversification Of High Latitude Mammals And Their Parasites During The Pliocene And Quarternary, Joseph A. Cook, Eric P. Hoberg, Anson Koehler, Heikki Henttonen, Lotta Wickström, Voitto Haukisalmi, Kurt Galbreath, Felix Chernyavski, Nikolai Dokuchaev, Anatoli Lahzuhtkin, Stephen O. Macdonald, Andrew Hope, Eric Waltari, Amy Runck, Alasdair Veitch, Richard Popko, Emily Jenkins, Susan Kutz, Ralph Eckerlin

Harold W. Manter Laboratory of Parasitology: Faculty Publications

Beringia is the region spanning eastern Asia and northwestern North America that remained ice-free during the full glacial events of the Pleistocene. Numerous questions persist regarding the importance of this region in the evolution of northern faunas. Beringia has been implicated as both a high latitude refugium and as the crossroads (Bering Land Bridge) of the northern continents for boreal mammals. The Beringian Coevolution Project (BCP) is an international collaboration that has provided material to assess the pattern and timing of faunal exchange across the crossroads of the northern continents and the potential impact of past climatic events on differentiation. …

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Investigation Of The Mechanism Of Polarization Switching In Ferroelectric Capacitors By Three-Dimensional Piezoresponse Force Microscopy, Brian J. Rodriguez, Alexei Gruverman, Angus I. Kingon, Robert J. Nemanich, J. S. Cross Jan 2005

Investigation Of The Mechanism Of Polarization Switching In Ferroelectric Capacitors By Three-Dimensional Piezoresponse Force Microscopy, Brian J. Rodriguez, Alexei Gruverman, Angus I. Kingon, Robert J. Nemanich, J. S. Cross

Alexei Gruverman Publications

A mechanism for the switching behavior of (111)-oriented Pb(Zr, Ti)O3-based 1 × 1.5 μm2 capacitors has been investigated using three-dimensional piezoresponse force microscopy (3D-PFM). A combination of vertical and lateral piezoresponse force microscopy (VPFM and LPFM) has been used to map the out-of-plane and the in-plane components of the polarization. The three-dimensional polarization distribution was reconstructed by quantitative analysis of the PFM amplitude images of poled PZT capacitors while taking into account contrast variations in the PFM phase images. The switching behavior of the capacitors was determined by comparison of the static domain patterns in the same …

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Broadening Middle-School Students’ Images Of Science And Scientists, Diandra Leslie-Pelecky, Gayle A. Buck, Angela Zabawa Jan 2005

Broadening Middle-School Students’ Images Of Science And Scientists, Diandra Leslie-Pelecky, Gayle A. Buck, Angela Zabawa

Diandra Leslie-Pelecky Publications

The ‘mad scientist’ stereotype is alive and well – and not an image most K-12 students can (or want to) embrace. Project Fulcrum, a National Science Foundation-funded GK-12 program, partners math, science and engineering graduate students with elementary and middle-level teachers. One project goal – broadening student images of science and scientists –is addressed by projects developed by the teacher/scientist teams that are focused on the specific needs of their students. The projects developed focus on scientists, the use of science in different types of jobs, and developing scientific skills. Pre-project research, in which teachers probe the motivation behind their …

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The Stability And Oxidation Resistance Of Iron- And Cobalt-Based Magnetic Nanoparticle Fluids Fabricated By Inert-Gas Condensation, Nguyen H. Hai, Raymond Lemoine, Shaina Remboldt, Michelle A. Strand, Steve Wignall, Jeffrey E. Shield, Diandra Leslie-Pelecky Jan 2005

The Stability And Oxidation Resistance Of Iron- And Cobalt-Based Magnetic Nanoparticle Fluids Fabricated By Inert-Gas Condensation, Nguyen H. Hai, Raymond Lemoine, Shaina Remboldt, Michelle A. Strand, Steve Wignall, Jeffrey E. Shield, Diandra Leslie-Pelecky

Diandra Leslie-Pelecky Publications

Magnetic nanoparticle fluids have numerous biomedical applications, including magnetic imaging, drug delivery, and hyperthemia treatment for cancer. Ideal magnetic nanoparticle fluids have well-separated, biocompatible nanoparticles with a small size distribution that form a stable colloid. We have combined inert-gas condensation, which produces nanoparticles with low polydispersity, with deposition directly into a surfactant-laden fluid to prevent agglomeration. Iron, cobalt, and iron-nitride nanoparticle fluids fabricated using inert-gas condensation have with mean particle sizes from 5-50 nm and remain stable over long periods of time. Iron and cobalt nanoparticles oxidize on exposure to air, with oxidation rates dependent on surfactant type and concentration. …

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Einstein’S Impact On Optics At The Frontier, Donald Umstadter Jan 2005

Einstein’S Impact On Optics At The Frontier, Donald Umstadter

Donald Umstadter Publications

The seminal contributions made by Einstein a century ago have enabled a new frontier area of science, called high-field science. This research involves the physics of the interactions of matter with electromagnetic fields at its highest levels ever achieved in the laboratory. Besides being of fundamental importance to physics research, the discoveries being made in this area are also leading to a new generation of compact and ultrashort-duration particle accelerators and X-ray light sources, with applications ranging from nuclear fusion to cancer therapy.

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Fundamental Contribution Of Β-Oxidation To Polyketide Mycotoxin Production In Planta, Lori A. Maggio-Hall, Richard A. Wilson, Nancy P. Keller Jan 2005

Fundamental Contribution Of Β-Oxidation To Polyketide Mycotoxin Production In Planta, Lori A. Maggio-Hall, Richard A. Wilson, Nancy P. Keller

Fungal Molecular Plant-Microbe Interactions

Seed contamination with polyketide mycotoxins, including aflatoxin (AF) and sterigmatocystin (ST) produced by Aspergillus spp., is an agricultural, economic, and medical issue worldwide. Acetyl-CoA, the fundamental building block of all known fungal polyketides, is generated by a large number of biochemical pathways, including β-oxidation of fatty acids and glycolysis of sugars. We present several lines of evidence to support a major role for seed fatty acids in formation of AF and ST in A. flavus, A. parasiticus, and A. nidulans. Aspergillus strains exhibiting canonical signs of oleic acid–induced peroxisome proliferation, including increased catalase activity, β-oxidation gene expression, and …

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Genome Sequences Of Agropyron Mosaic Virus And Hordeum Mosaic Virus Support Reciprocal Monophyly Of The Genera Potyvirus And Rymovirus In The Family Potyviridae, Roy C. French, D.C. Stenger Jan 2005

Genome Sequences Of Agropyron Mosaic Virus And Hordeum Mosaic Virus Support Reciprocal Monophyly Of The Genera Potyvirus And Rymovirus In The Family Potyviridae, Roy C. French, D.C. Stenger

Department of Plant Pathology: Faculty Publications

Assignment of mite-transmitted species to the genus Rymovirus (family Potyviridae) has changed several times, and the status of the genus has been questioned. To address this issue, complete genome sequences of the rymoviruses Agropyron mosaic virus (AgMV) and Hordeum mosaic virus (HoMV) were determined. AgMV (9540 nucleotides) and HoMV (9463 nucleotides) each encode a single polyprotein with proteinase cleavage sites demarcating protein products characteristic of monopartite species of the family Potyviridae. Of the described species of Potyviridae, AgMV and HoMV are most closely related to each other (68.5% nucleotide and 71.6% amino acid sequence identity) and equidistant …

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