Digital Commons Network^™

Generation Of Novel Pikromycin Antibiotic Products Through Mutasynthesis, Shuchi Gupta, Venkatraman Lakshmanan, Beom Seok Kim, Robert Fecik, Kevin A. Reynolds

Chemistry Faculty Publications and Presentations

Mutasynthesis in pikromycin PKS: The amenability of pikromycin polyketide synthase to mutational biosynthesis has been demonstrated. A natural triketide and its analogues, activated as N-acetyl-cysteamine thioesters, were synthesized and fed to a pikAI-deleted strain; this led to the production of new antibiotics. A vinyl analogue was found to have better antibacterial activity than pikromycin.

Optimising The Synthesis And Red–Green–Blue Emission Of A Simple Organic Dye, Martha Sibrian-Vazquez, Robert M. Strongin

Chemistry Faculty Publications and Presentations

Synthetic dyes have been widely used in supramolecular chemistry not only to probe fundamental chemical interactions but also as components of functional materials. Most current efforts in this regard are directed at designing new host systems for the dyes. Herein we report on the study of a versatile new organic fluorophore. We describe a synthesis which affords improved yields in a convenient one pot procedure. Moreover, a simple method for predicting and controlling the dye’s responses to external stimuli affords a potentially practical method for achieving red–green–blue and concomitant white light generation.

Debord, Constant, And The Politics Of Situationist Urbanism, Brian Elliott

Philosophy Faculty Publications and Presentations

In the first years of its existence between 1957 and 1960 the efforts of the radical collective the Situationist International (SI) centred on its program of "unitary urbanism." This program sought to challenge the functionalist character of hegemonic forms of urban planning through novel practices of urban experimentation and contestation. Situationist urbanism arose largely through the collaboration between Guy Debord and the Dutch avant-garde architect Constant. This article explores the political dimension of situationist urbanism and the tensions that led to Constant’s secession from the group in 1960. Through analysis of the affinities and divergences between urbanism in its modernist …

Crystallography Open Database – An Open-Access Collection Of Crystal Structures, Saulius Grazulis, Daniel Chateigner, Robert T. Downs, A. F. T. Yokochi, Miguel Quirós, Luca Lutterotti, Elena Manakova, Justas Butkus, Peter Moeck, Armel Le Bail

Physics Faculty Publications and Presentations

The Crystallography Open Database (COD), which is a project that aims to gather all available inorganic, metal–organic and small organic molecule structural data in one database, is described. The database adopts an openaccess model. The COD currently contains 80,000 entries in crystallographic information file format, with nearly full coverage of the International Union of Crystallography publications, and is growing in size and quality.

Precession Electron Diffraction And Its Advantages For Structural Fingerprinting In The Transmission Electron Microscope, Peter Moeck, Sergei Rouvimov

Physics Faculty Publications and Presentations

The foundations of precession electron diffraction in a transmission electron microscope are outlined. A brief illustration of the fact that laboratory-based powder X-ray diffraction fingerprinting is not feasible for nanocrystals is given. A procedure for structural fingerprinting of nanocrystals on the basis of structural data that can be extracted from precession electron diffraction spot patterns is proposed.

Immigrant-Established Resident Interactions In Miami, Florida, Alex Stepick, Carol Dutton Stepick

Sociology Faculty Publications and Presentations

This article examines factors that affect interethnic relations in Miami, Florida. The theoretical framework, based on the ‘contact hypothesis’ argues that better interethnic relations stem from not only contact, but also contact in which individuals from opposing groups share equal status and a stake in outcomes, and when contact activities require cooperation. The contact hypothesis, however, does not address the factors that produce inequality in social relations. To address these factors ideas from international migration research are used to argue that those with power must create structures in which other groups feel welcome rather than rejected and that leaders must …

No Vacancy, Rebecca Dann, Beth Somerfield, Emily Rice, Briana Meier

Master of Urban and Regional Planning Workshop Projects

Vacant lots and buildings, whether in stages of redevelopment or decline, are spaces in flux. Left unused, these empty spaces can pose difficult challenges for their owners and surrounding neighborhoods; however, the uncertain futures of vacant sites also present unique opportunities for a variety of temporary uses. In partnership with the Central Eastside Industrial Council, LocusLab is exploring the potential to enliven the Central Eastside Industrial District by activating vacant spaces with temporary activities and developments. We've worked to: uncover potential benefits of temporary use; find ways to overcome barriers faced by temporary projects; initiate a conversation between property owners, …

Neighborhood Climate Action Planning Handbook, Hannah Dondy-Kaplan, Erica Timm, Beth Cohen, Dyami Valentine, Mariah Vanzerr, Devin Moller

Master of Urban and Regional Planning Workshop Projects

The City of Portland and Multnomah County are developing new plans and policies to meet greenhouse gas reduction goals of 80% below 1990 levels by 2050. To meet these new steep reduction targets, actions will be needed at every level of society. While neighborhoods have historically received little attention as a means of addressing climate change, they are ideally suited to bring people together to bridge the gap between individual actions and higher level government policies. To help neighborhoods develop strategies and actions to address climate change, C-Change Consultants worked with the Southeast Uplift Neighborhood Coalition to create a Neighborhood …

Three Times A Study: Business Students And The Library, Heidi Senior, Kerry Wu, Diane M. Martin, Margaret Mellinger

Library Faculty and Staff Publications and Presentations

Revisiting a study performed 30 years ago, researchers at three institutions surveyed undergraduate and graduate students in marketing courses to determine their attitudes toward and knowledge of library services and collections. Results found that 21st-century students are more likely to believe in the importance of library research, to have had library instruction, and to use Web sites and Internet search engines to begin their research. However, they are less likely to read business periodicals. Faced with a list of information sources, they are generally able to pick out a useful resource, although not always the most efficient. Implications for library …

Focal Point, Volume 23 Number 01, Portland State University. Regional Research Institute

Research and Training Center - Focal Point

Stigmatization can result in exclusion of and discrimination against the stigmatized individual. This issue of Focal Point provides state-of-the-art information about stigmatization, its causes and consequences, and strategies and programs for alleviating it.

Training New Outdoor Program Managers: Recommendations Based On An Exploration Of The Management Beliefs And Practices Of Outdoor Program Managers, Travis Southworth-Neumeyer

Leadership for Sustainability Education Comprehensive Papers

This comprehensive project synthesizes the existing literature related to leading and managing outdoor programs and explores the beliefs and experiences of outdoor program managers with survey research. It defines the training needs of new outdoor program managers and suggests a potential evaluation and training needs assessment tool for new outdoor program managers.

‘Community’, Semiotic Flows, And Mediated Contribution To Activity, Steven L. Thorne

World Languages and Literatures Faculty Publications and Presentations

This article begins with an overview and problematization of the term community through a brief assessment of its history, diverse uses, core attributes, heterogeneous elements, and collocational companions. Following this, I describe demographics and processes associated with collective engagement in digitally mediated environments. Utilizing select alternatives to the term ‘community’ and incorporating the cultural-historical notions of mediation and activity, I then present research describing exogenous influences affecting educational uses of technology in L2 settings, the use of instant messaging and blogging for out-of-class FL interaction at the secondary school level, and a pedagogically focused example of a remixing text posted …

Book Publishing In Western Australia: A World Elsewhere, Per Henningsgaard

English Faculty Publications and Presentations

This article examines the role of book publishing outside the cultural centres, where the lack of access to the gatekeepers of cultural production, such as literary agents, editors and publishers, has inhibited both the publishers’ and region’s reach into the public imagination. It takes Western Australia as a case study, analysing the impact of geographical regionalism on the processes of book production and publication. Western Australia is infrequently represented in the cultural record, much less in those aspects of the cultural record that are transmitted overseas. This imbalance in ‘cultural currency’ arises because regions are at least in part defined …

Right Directions, Wrong Maps: Understanding The Involvement Of Low-Ses African American Parents To Enlist Them As Partners In College Choice, Michael J. Smith

Education Faculty Publications and Presentations

While research extols the benefits of parent involvement in college choice, low SES African American parents are increasingly less able to match the efforts of wealthier parents. A qualitative methodology is used to explore the lives 5 urban African American single parents whose low-SES parents encouraged education for postsecondary advancement. The study found that the high school diploma was the normative credential for upward mobility in their communities. Their parents used narratives of struggle to encourage their children while utilizing maps that helped navigate the road towards a high school diploma. It concludes that a high level of involvement already …

Radiative Transfer Theory Applied To Ocean Bottom Modeling, Lisa M. Zurk, Jorge Quijano

Electrical and Computer Engineering Faculty Publications and Presentations

Research on the propagation of acoustic waves in the ocean bottom sediment is of interest for active sonar applications such as target detection and remote sensing. The interaction of acoustic energy with the sea floor sublayers is usually modeled with techniques based on the full solution of the wave equation, which sometimes leads to mathematically intractable problems. An alternative way to model wave propagation in layered media containing random scatterers is the radiative transfer RT formulation, which is a well established technique in the electromagnetics community and is based on the principle of conservation of energy. In this paper, the …

Stability Of Linear Flocks On A Ring Road, J. J. P. Veerman, Carlos Martins Da Fonseca

Mathematics and Statistics Faculty Publications and Presentations

We discuss some stability problems when each agent of a linear flock on the line interacts with its two nearest neighbors (one on either side).

Automated Traffic And The Finite Size Resonance, J. J. P. Veerman, Borko D. Stošić, F. M. Tangerman

Mathematics and Statistics Faculty Publications and Presentations

We investigate in detail what one might call the canonical (automated) traffic problem: A long string of N+1 cars (numbered from 0 to N) moves along a one-lane road “in formation” at a constant velocity and with a unit distance between successive cars. Each car monitors the relative velocity and position of only its neighboring cars. This information is then fed back to its own engine which decelerates (brakes) or accelerates according to the information it receives. The question is: What happens when due to an external influence—a traffic light turning green—the ‘zero’th’ car (the “leader”) accelerates?

As …

Educational Change Through The Lens Of Complexity Science: Changing Thinking For Changed Learners, Suzann Girtz

Northwest Journal of Teacher Education

As education professionals work in times of exponential change, how they think is as important as what they do. Our thought processes frame our creations—and for hundreds of years that frame has been a linear, Newtonian paradigm. Due to advances in hard sciences, we now know that there are other ways of framing our thoughts and understanding our world, and that is through complexity science. Complexity science is a powerful metaphor to use in reviewing our common understandings of school systems and how to reform them to better serve students. This paper includes a primer of complexity science terms and …

Deficiencies In The Practicum Phase Of Field-Based Education: Students’ Views, Edwin Ralph, Keith Walker, Randy Wimmer

Northwest Journal of Teacher Education

A supervised practical experience of on-the-job training forms an essential part of the pre-service preparation of professionals across disciplines. This article reports results from a recent study examining the views of 234 teacher candidates regarding the most negative aspects of their experiences in the 16-week extended-practicum. Four broad themes reflected the post-interns’ responses on the negative elements: (a) individual personal/professional challenges, (b) site-based interpersonal concerns, (c) university- related policy/procedural problems, and (d) practicum-office difficulties. Implications are discussed for the practicum leaders of this program and those from other institutions interested in preventing or reducing such limitations from hampering the effectiveness …

Community, Conversation, And Conflict: A Study Of Deliberation And Moderation In A Collaborative Political Weblog, Samantha Isabella Soma

Dissertations and Theses

Concerns about the feasibility of the Internet as an appropriate venue for deliberation have emerged based on the adverse effects of depersonalization, anonymity, and lack of accountability on the part of online discussants. As in face-to-face communication, participants in online conversations are best situated to determine for themselves what type of communication is appropriate. Earlier research on Usenet groups was not optimistic, but community-administered moderation may provide a valuable tool for online political discussion groups who wish to support and enforce deliberative communication among a diverse or disagreeing membership.

This research examines individual comments and their rating and moderation within …

A Photochemically Initiated Chemistry For Coupling Underivatized Carbohydrates To Gold Nanoparticles, Xin Wang, Olof Ramström, Mingdi Yan

Chemistry Faculty Publications and Presentations

The sensitive optoelectronic properties of metal nanoparticles make nanoparticle-based materials a powerful tool to study fundamental biorecognition processes. Here we present a new and versatile method for coupling underivatized carbohydrates to gold nanoparticles (Au NPs) via the photochemically induced reaction of perfluorophenylazide (PFPA). A one-pot procedure was developed where Au NPs were synthesized and functionalized with PFPA by a ligand-exchange reaction. Carbohydrates were subsequently immobilized on the NPs by a fast light activation. The coupling reaction was efficient, resulting in high coupling yield as well as high ligand surface coverage. A colorimetric system based on the carbohydrate-modified Au NPs was …

Sex Work And Moral Conflict: Enhancing The Quality Of Public Discourse Using Photovoice Method, Crystal Renee Tenty

Dissertations and Theses

This thesis uses an advocacy/participatory framework and moral conflict theory to examine the opposing ideas: and interests of parties involved in the issue of prostitution on 82^nd Avenue in Portland, Oregon. It locates areas of contention within the larger dominant feminist discourse, which views sex work as either a form of violence and exploitation or as a form of legitimate free-contract labor. The thesis shows how the intractable moral conflict between these differing feminist theories and values can be mediated using participatory data collection techniques.

Ethnographic data was collected and analyzed from 11 women working in the sex industry …

“In The Shadow Of A Concrete Forest”: Transportation Politics In Portland, Oregon, And The Revolt Against The Mount Hood Freeway, 1955-1976, Val C. Ballestrem

Dissertations and Theses

In 1955, The Oregon State Highway Department helped usher in the freeway building era in Portland by publishing its plan for 14 modern freeways designed to crisscross the city. A major component of that report was the Mount Hood Freeway, a route designed to pass through southeast Portland, connecting the city to its expanding eastern suburbs. Other freeway routes in the Portland area were given precedence over the Mount Hood Freeway and by 1969, when the route obtained federal interstate status, urban freeways across the nation had become highly controversial. Over the next seven years a struggle ensued pitting those …

Literacy Leadership In Secondary Schools: A Case Study Of Teaching And Learning In Two School Districts, Gregory Berry

Dissertations and Theses

Improvement in literacy learning in secondary schools requires a dual focus: a district and school organizational leadership approach, and a classroom- and instruction-focused approach. To help close the achievement gap and improve learning for all students, whole school reform efforts must be focused on literacy. Elements of whole school reform may include professional development programs such as professional learning communities, peer coaching, and literacy coaching. The sociocultural contexts that these approaches incorporate can help improve the learning of both teachers and students and can bring about significant secondary school reform and academic improvement.

This dissertation study is a qualitative, collective, …

Developing Sustainable Spacecraft Water Management Systems, Evan A. Thomas, David M. Klaus

Mechanical and Materials Engineering Faculty Publications and Presentations

It is well recognized that water handling systems used in a spacecraft are prone to failure caused by biofouling and mineral scaling, which can clog mechanical systems and degrade the performance of capillary-based technologies. Long duration spaceflight applications, such as extended stays at a Lunar Outpost or during a Mars transit mission, will increasingly benefit from hardware that is generally more robust and operationally sustainable overtime. This paper presents potential design and testing considerations for improving the reliability of water handling technologies for exploration spacecraft. Our application of interest is to devise a spacecraft wastewater management system wherein fouling can …

The Portland Spectator, December 2008, Portland State University. Student Publications Board

Portland Spectator

Editor: Sarah J. Christensen

Articles in this issue include: Romeo Sosa: The success story of a Guatemalan activist; Resouces for you! Fitness writer shares the secrets of the Stott Center; Vulgarity in TV and film: Keith Moore shows his disdain Hollywood’s use of vulgarity and violence; Dis-unity in our parties: Our writer looks at the power of failure; and Oregon's smoking ban: What this really means for your rights.

Alagnak Wild River Visitor Use Project: Alagnak Wild River Resident User Study, Douglas Deur

Anthropology Faculty Publications and Presentations

This report represents a thematic summary of findings from the Alagnak Wild River Resident Users Study, the final project in a larger series of studies conducted for the National Park Service (NPS) as part of the Alagnak Wild River Visitor Use Project. The National Park service administers the 56 miles of designated Wild River along the Alagnak in collaboration with the Alaska Department of Fish and Game, which manages fish and wildlife populations along the river. The NPS is charged with managing the river’s natural and cultural resources, as well as preserving the river’s lands and resources for current and …

The Effect Of The Amide Substituent On The Biodistribution And Tolerance Of Lanthanide(Iii) Dota-Tetraamide Derivatives, Mark Woods, Peter Caravan, Carlos F.G.C. Geraldes, Matthew T. Greenfield, Garry Kiefer, Mai Lin, Kenneth Mcmillan, M. Isabel M. Prata, Ana C. Santos, Xiankai Sun, Jufeng Wang, Shanrong Zhang, Piyu Zhao, A. Dean Sherry

Chemistry Faculty Publications and Presentations

Objectives—Recent advances in the design of MRI contrast agents have rendered the lanthanide complexes of DOTA-tetraamide ligands of considerable interest, both as responsive MR agents and paramagnetic chemical exchange saturation transfer agents. The potential utility of these complexes for in vivo applications is contingent upon them being well tolerated by the body. The purpose of this study was to examine how the nature of the amide substituent, and in particular its charge, affected the fate of these chelates postinjection.

Materials and Methods—Complexes of 6 DOTA-tetraamide ligands were prepared in which the nature of the amide substituent was systematically …

General Validity Of Reciprocity In Quantum Mechanics, P.T. Leung, H. Y. Xie, D. P. Tsai

Physics Faculty Publications and Presentations

The concept of reciprocity symmetry for matter-wave propagation is established for nonrelativistic quantum mechanics with previous results in the literature extended to include nonlocal interactions. Examples are given for cases with both local and nonlocal potentials, where we show in particular that reciprocity can be violated for the motion of a charged particle in an external electromagnetic field. In addition, this symmetry is applied to interpret a recent analysis [Phys. Rev. A 64, 042716 (2001)] on the symmetry of transmission through one-dimensional complex potentials, with the emphasis that the validity of reciprocity can go beyond that of time-reversal symmetry, such …

Hardware Architectures And Implementations For Associative Memories : The Building Blocks Of Hierarchically Distributed Memories, Changjian Gao

Dissertations and Theses

During the past several decades, the semiconductor industry has grown into a global industry with revenues around $300 billion. Intel no longer relies on only transistor scaling for higher CPU performance, but instead, focuses more on multiple cores on a single die. It has been projected that in 2016 most CMOS circuits will be manufactured with 22 nm process. The CMOS circuits will have a large number of defects. Especially when the transistor goes below sub-micron, the original deterministic circuits will start having probabilistic characteristics. Hence, it would be challenging to map traditional computational models onto probabilistic circuits, suggesting a …