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Faculty Publications

2000

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Making Classical And Quantum Canonical General Relativity Computable Through A Power Series Expansion In The Inverse Cosmological Constant, Rodolfo Gambini, Jorge Pullin Dec 2000

Making Classical And Quantum Canonical General Relativity Computable Through A Power Series Expansion In The Inverse Cosmological Constant, Rodolfo Gambini, Jorge Pullin

Faculty Publications

Casting ordinary general relativity as a perturbative theory in Λ-1 and starting with background theory in which Λ → ∞ allows one to explicitly compute nondegenerate physical quantum states and observables. The technique is applicable in the theory in general and also in mini-super-space models. In the general theory, the calculations are well defined and tractable, but quite involved. This opens up a program for the quantization of the gravitational field that is well defined computationally and allows contact with the physical observables of the theory, a key ingredient in the road to finding a theory with a semiclassical regime …

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Soft-X-Ray Fluorescence Study Of The Quasi-One-Dimensional Heisenberg Antiferromagnet Tetraphenylverdazyl, E. Z. Kurmaev, V. R. Galakhov, S. Shimada, T. Otsuka, K. Endo, S. Stadler, D. L. Ederer, A. Moewes, H. Schuerman, M. Neumann, S. Tomiyoshi, N. Azuma, M. Iwami Dec 2000

Soft-X-Ray Fluorescence Study Of The Quasi-One-Dimensional Heisenberg Antiferromagnet Tetraphenylverdazyl, E. Z. Kurmaev, V. R. Galakhov, S. Shimada, T. Otsuka, K. Endo, S. Stadler, D. L. Ederer, A. Moewes, H. Schuerman, M. Neumann, S. Tomiyoshi, N. Azuma, M. Iwami

Faculty Publications

Soft-x-ray fluorescence measurements have been performed on a single crystal of the organic antiferromagnet 2,4,6-triphenylverdazyl. Resonant and nonresonant C Kα and N Kα (2p → 1s transition) x-ray emission spectra (XES) were measured and compared with x-ray photoelectron valence band spectra and deMon density-functional theory calculations. It is shown that intramolecular interactions are much stronger than intermolecular ones and give the main contribution to the formation of C 2p density of states. We present evidence of a delocalization of unpaired N 2p electrons over the verdazyl ring. The excitation energy dependence of C Kα and N Kα XES observed below …

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Carbon Monoxide Production Is Not Enhanced By Nitrogenase Activity, P. Milligan, G. M. King Dec 2000

Carbon Monoxide Production Is Not Enhanced By Nitrogenase Activity, P. Milligan, G. M. King

Faculty Publications

A diverse group of nitrogen-fixing bacteria and two heme degraders were grown with and without fixed nitrogen sources under oxic and suboxic conditions, with and without addition of heme-containing compounds. Several of the strains produced carbon monoxide (CO) under one or more of these conditions, but nitrogenase activity did not stimulate rates of production relative to controls. Although nitrogenase can reduce CO2 to CO in vitro in the absence of N2, this process likely contributes minimally to CO production in soils under in situ conditions. In contrast, myoglobin or hematin addition under oxic conditions significantly stimulated CO production by the …

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Hole Distribution In (Sr, Ca, Y, La) 14cu24o41 Ladder Compounds Studied By X-Ray Absorption Spectroscopy, N. Nücker, M. Merz, C. A. Kuntscher, S. Gerhold, S. Schuppler, R. Neudert, M. S. Golden, J. Fink, D. Schild, S. Stadler, V. Chakarian, J. Freeland, Y. U. Idzerda, K. Conder, M. Uehara, T. Nagata, J. Goto, J. Akimitsu, N. Motoyama, H. Eisaki, S. Uchida, U. Ammerahl, A. Revcolevschi Dec 2000

Hole Distribution In (Sr, Ca, Y, La) 14cu24o41 Ladder Compounds Studied By X-Ray Absorption Spectroscopy, N. Nücker, M. Merz, C. A. Kuntscher, S. Gerhold, S. Schuppler, R. Neudert, M. S. Golden, J. Fink, D. Schild, S. Stadler, V. Chakarian, J. Freeland, Y. U. Idzerda, K. Conder, M. Uehara, T. Nagata, J. Goto, J. Akimitsu, N. Motoyama, H. Eisaki, S. Uchida, U. Ammerahl, A. Revcolevschi

Faculty Publications

The unoccupied electronic structure for the Sr14Cu24O41 family of two-leg ladder compounds was investigated for different partial substitutions of Sr2+ by Ca2+, leaving the nominal hole count constant, and by Y3+ or La3+, reducing the nominal hole count from its full value of 6 per formula unit. Using polarization-dependent x-ray absorption spectroscopy on single crystals, hole states on both the chain and ladder sites could be studied. While for intermediate hole counts all holes reside on O sites of the chains, a partial hole occupation on the ladder sites in orbitals oriented along the legs is observed for the fully …

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Minimal And Contributing Sequence Determinants Of The Cis-Acting Locus Of Transfer (Clt) Of Streptomycete Plasmid Pij101 Occur Within An Intrinsically Curved Plasmid Region, M. J. Ducote, S. Prakash, G. S. Pettis Dec 2000

Minimal And Contributing Sequence Determinants Of The Cis-Acting Locus Of Transfer (Clt) Of Streptomycete Plasmid Pij101 Occur Within An Intrinsically Curved Plasmid Region, M. J. Ducote, S. Prakash, G. S. Pettis

Faculty Publications

Efficient interbacterial transfer of streptomycete plasmid pIJ101 requires the pIJ101 tra gene, as well as a cis-acting plasmid function known as clt. Here we show that the minimal pIJ101 clt locus consists of a sequence no greater than 54 bp in size that includes essential inverted-repeat and direct-repeat sequences and is located in close proximity to the 3′ end of the korB regulatory gene. Evidence that sequences extending beyond the minimal locus and into the korB open reading frame influence clt transfer function and demonstration that clt-korB sequences are intrinsically curved raise the possibility that higher-order structuring of DNA and …

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Land Use Impacts On Atmospheric Carbon Monoxide Consumption By Soils, G. M. King Dec 2000

Land Use Impacts On Atmospheric Carbon Monoxide Consumption By Soils, G. M. King

Faculty Publications

Seasonal analyses of in situ CO fluxes from forested and agricultural soils in Maine and Georgia, and more limited comparisons in Hawai'i indicated that agricultural land use consistently enhanced CO consumption. Soils at an agricultural site in Maine consumed approximately 1.9 g CO m-2 yr-1 while uptake in a nearby mixed forest was about 70% lower, 0.6 g CO m-2 yr-1. A similar trend was observed for sites in Georgia, where annual uptake by agricultural sites was approximately 1.0 g CO m-2 while net emission (about -0.5 g CO m-2) was observed for neighboring pine stands. Net CO fluxes in …

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Influence Of Habitat Use-Patterns On Cooperative Breeding In The Brown-Headed Nuthatch., Brent Burt, Albert Herb Dec 2000

Influence Of Habitat Use-Patterns On Cooperative Breeding In The Brown-Headed Nuthatch., Brent Burt, Albert Herb

Faculty Publications

Documenting the habitat use patterns of the Brown-headed Nuthatch, we describe how its habitat use patterns contribute to ecological constraints that may maintain cooperative breeding in this species.

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The Environmental Science Minor: A Disciplinary Approach To Interdisciplinary Studies With A Grounding In Undergraduate Research, Brian E. Bodenbender, Edward C. Hansen, Graham F. Peaslee, Jonathan W. Peterson Dec 2000

The Environmental Science Minor: A Disciplinary Approach To Interdisciplinary Studies With A Grounding In Undergraduate Research, Brian E. Bodenbender, Edward C. Hansen, Graham F. Peaslee, Jonathan W. Peterson

Faculty Publications

No abstract provided.

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Simplified Calculation Of The Stability Matrix For Semiclassical Propagation, Sophya Garashchuk, John C. Light Dec 2000

Simplified Calculation Of The Stability Matrix For Semiclassical Propagation, Sophya Garashchuk, John C. Light

Faculty Publications

We present a simple method of calculation of the stability (monodromy) matrix that enters the widely used semiclassical propagator of Herman and Kluk and almost all other semiclassical propagators. The method is based on the unitarity of classical propagation and does not involve any approximations. The number of auxiliary differential equations per trajectory scales linearly rather than quadratically with the system size. Just the first derivatives of the potential surface are needed. The method is illustrated on the collinear H[sub 3] system.

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Functional Projections Of Predicates: Experimental Evidence From Coordinate Structure Processing, Stanley William Dubinsky, Marie Egan, A. Rene Schumauder, Matthew J. Traxler Dec 2000

Functional Projections Of Predicates: Experimental Evidence From Coordinate Structure Processing, Stanley William Dubinsky, Marie Egan, A. Rene Schumauder, Matthew J. Traxler

Faculty Publications

This paper reports the results of six experiments involving an on-line self-paced reading task that examine the processing of coordinate small clause predicate phrases versus coordinated arguments NPs. The results have particular significance for the analysis of small clause complement constructions, and support accounts wherein the small clause complement has an Agr projection associated with it. An adequate explanation of the processing of small clause coordination is shown to motivate a new parsing principle, Coordination Feature-matching, which accounts for the longer reading times observed for the coordination of predicates in small clause complements.

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Proteolytic Enzymes In The Marine Bacterium Pseudoalteromonas Atlantica: Post-Secretional Activation And Effects Of Environmental Conditions, Monica Hoffman, Alan W. Decho Dec 2000

Proteolytic Enzymes In The Marine Bacterium Pseudoalteromonas Atlantica: Post-Secretional Activation And Effects Of Environmental Conditions, Monica Hoffman, Alan W. Decho

Faculty Publications

Production and activities of cellular and extracellular proteolytic enzymes associated with the marine bacterium Pseudoalteromonas atlantica were examined in response to physiological state and changing environmental variables under laboratory conditions. Enzymes evidenced by zymography were metalloproteases, as defined by substrate preference and susceptibility to inhibitors (EDTA and 1, 10-phenanthroline). Distinct bands (i.e. molecular-weight [MW] size classes) of enzymes were isolated from within cellular and extracellular compartments. Susceptibility of extracellular enzymes to environmental stressors was related, in part, to the MW size classes of the enzymes. While all bands of enzymes showed some degree of inhibition when pH was decreased, the …

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Biomedical Research Leaders: Report On Needs, Opportunities, Difficulties, Education And Training, And Evaluation, Samuel H. Wilson, Deborah Brown, Jay Moskowitz, Dan Hurley, David Brown, David Brown, Byron J. Bailey, Michael Mcclain, Marilyn Misenhimer, Judith Buckalew, Thomas Burks Dec 2000

Biomedical Research Leaders: Report On Needs, Opportunities, Difficulties, Education And Training, And Evaluation, Samuel H. Wilson, Deborah Brown, Jay Moskowitz, Dan Hurley, David Brown, David Brown, Byron J. Bailey, Michael Mcclain, Marilyn Misenhimer, Judith Buckalew, Thomas Burks

Faculty Publications

The National Association of Physicians for the Environment (NAPE) has assumed a leadership role in protecting environmental health in recent years. The Committee of Biomedical Research Leaders was convened at the recent NAPE Leadership Conference: Biomedical Research and the Environment held on 1–2 November 1999, at the National Institutes of Health, Bethesda, Maryland. This report summarizes the discussion of the committee and its recommendations. The charge to the committee was to raise and address issues that will promote and sustain environmental health, safety, and energy efficiency within the biomedical community. Leaders from every important research sector (industry laboratories, academic health …

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Effect Of Gate Leakage Current On Noise Properties Of Algan/Gan Field Effect Transistors, S. L. Rumyantsev, N. Pala, M. S. Shur, R. Gaska, M. E. Levinshtein, M. Asif Khan, Grigory Simin, X. Hu, J. Yang Dec 2000

Effect Of Gate Leakage Current On Noise Properties Of Algan/Gan Field Effect Transistors, S. L. Rumyantsev, N. Pala, M. S. Shur, R. Gaska, M. E. Levinshtein, M. Asif Khan, Grigory Simin, X. Hu, J. Yang

Faculty Publications

The effect of the gate leakage current fluctuations on noiseproperties of AlGaN/GaN heterostructurefield effect transistors(HFETs) has been studied in conventional HFET structures and in AlGaN/GaN metal-oxide-semiconductorheterostructurefield effect transistors (MOS-HFETs). The comparison of the noiseproperties of conventional AlGaN/GaN HFETs and AlGaN/GaN MOS-HFETs fabricated on the same wafer, allowed us to estimate the contribution of the gate currentnoise to the HFET’s output noise. The effect of the gate current fluctuations on output noiseproperties of HFETs depends on the level of noise in the AlGaN/GaN HFETs. For the transistors with a relatively high magnitude of the Hooge parameter α∼10−3, even a …

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Photo-Induced Isotopic Fractionation, Charles E. Miller, Yuk L. Yung Dec 2000

Photo-Induced Isotopic Fractionation, Charles E. Miller, Yuk L. Yung

Faculty Publications

No abstract provided.

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Risk Factors And Gender Differentials For Death Among Children Hospitalized With Diarrhoea In Bangladesh, Amal K. Mitra, Mohammad M. Rahman, George J. Fuchs Dec 2000

Risk Factors And Gender Differentials For Death Among Children Hospitalized With Diarrhoea In Bangladesh, Amal K. Mitra, Mohammad M. Rahman, George J. Fuchs

Faculty Publications

To identify risk factors for death among children with diarrhoea, a cohort of 496 children, aged less than 5 years, admitted to the intensive care unit of a diarrhoeal disease hospital in Bangladesh, was studied during November 1992-June 1994, Clinical and laboratory records of children who died and of those who recovered in the hospital were compared, Deaths were significantly higher among those who had altered consciousness, hypoglycaemia, septicaemia, paralytic ileus, toxic colitis, necrotizing enterocolitis, haemolytic-uraemic syndrome, invasive or persistent diarrhoea, dehydration, electrolyte imbalances, and malnutrition, Females experienced a 2-fold higher risk of death than males (p=0.003). Several indices of …

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Direct Generation Of Optical Diffractive Elements In Perfluorocyclobutane (Pfcb) Polymers By Soft Lithography, Gregory P. Nordin, J. Ballato, P. C. Deguzman, S. Foulger, H. Shah, D. Smith Dec 2000

Direct Generation Of Optical Diffractive Elements In Perfluorocyclobutane (Pfcb) Polymers By Soft Lithography, Gregory P. Nordin, J. Ballato, P. C. Deguzman, S. Foulger, H. Shah, D. Smith

Faculty Publications

Optically diffractive line gratings with 0.58- m feature sizes have been generated in 100- m perfluorocyclobutane (PFCB) polymer films by direct micromolding using only a silicon master. Strong reflectivities from the green to red portions of the visible spectrum, depending on incident beam angle, were observed with 3 dB bandwidths of approximately 30 nm. This negative mold-free technique permits, for the first time to our knowledge, feature reproduction at submicrometer size scales, eliminates several steps from conventional soft lithographic methods, and marks itself as a practical means for rapidly generating planar photonic structures that operate spectrally in the visible and …

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Finite-Aperture Wire Grid Polarizers, Michael A. Jensen, Gregory P. Nordin Dec 2000

Finite-Aperture Wire Grid Polarizers, Michael A. Jensen, Gregory P. Nordin

Faculty Publications

The transmission characteristics of wire grid polarizers fabricated in finite apertures are investigated by using a three-dimensional finite-difference time-domain formulation. Specifically, the optical transmissivity and extinction ratio are characterized for a wide variety of geometrical parameters including aperture size in both dimensions, conducting wire fill factor, and polarizer thickness. A dispersive material model is used to investigate the performance of polarizers fabricated by using realistic metals at infrared wavelengths. The results indicate that the aperture dimension significantly impacts the polarizer transmission behavior and that the extinction of the unwanted polarization is often limited by depolarizing scattering that is due to …

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Gender Differences In Sexual Behaviors And Factors Associated With Nonuse Of Condoms Among Homeless And Runaway Youths, Duncan A. Mackeller, Linda A. Valleroy, John P. Hoffmann, Donna Glebatis, Marlene Lalota, William Mcfarland, Johnny Westerholm, Robert S. Janssen Dec 2000

Gender Differences In Sexual Behaviors And Factors Associated With Nonuse Of Condoms Among Homeless And Runaway Youths, Duncan A. Mackeller, Linda A. Valleroy, John P. Hoffmann, Donna Glebatis, Marlene Lalota, William Mcfarland, Johnny Westerholm, Robert S. Janssen

Faculty Publications

Few studies have examined gender-specific factors associated with the nonuse of condoms among homeless and runaway youths (HRYs)–a population at high risk for HIV infection. In this article, we evaluate these factors and explore gender differences in background experiences, psychosocial functioning, and risk behaviors among HRYs from four U.S. metropolitan areas. Of 879 sexually active HRYs sampled, approximately 70% reported unprotected sexual intercourse during a 6-month period, and nearly a quarter reported never using condoms in the same period. Among males and females, having only one sex partner in the previous 6 months had the strongest association with nonuse of …

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A Simple Surface Temperature Assimilation Scheme For Use In Land Surface Models, Venkataraman Lakshmi Dec 2000

A Simple Surface Temperature Assimilation Scheme For Use In Land Surface Models, Venkataraman Lakshmi

Faculty Publications

This paper examines the utilization of surface temperature as a variable which can be assimilated in off-line land surface hydrological models. The connection between the surface temperature and evapotranspiration is utilized in making adjustments to the model-computed surface soil moisture. This adjustment is a function of the difference between the model-computed and the observed surface temperature. Comparisons between the model-computed and satellite-observed surface temperatures have been carried out. The assimilation of surface temperature is carried out twice a day (corresponding to the A.M. and P.M. overpass of the NOAA 10) over the Red-Arkansas basin in the southwestern United States (31°50′N-36°N, …

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Erratum: Magnetoresistance From Quantum Interference Effects In Ferromagnets (Nature (2000) 404 (581-584)), N. Manyala, Y. Sidis, J. F. Ditusa, G. Aeppli, D. P. Young, Z. Fisk Nov 2000

Erratum: Magnetoresistance From Quantum Interference Effects In Ferromagnets (Nature (2000) 404 (581-584)), N. Manyala, Y. Sidis, J. F. Ditusa, G. Aeppli, D. P. Young, Z. Fisk

Faculty Publications

No abstract provided.

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The Averaging Lemma, Ronald A. Devore, Guergana Petrova Nov 2000

The Averaging Lemma, Ronald A. Devore, Guergana Petrova

Faculty Publications

No abstract provided.

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Molecular Dynamics Calculations Of The Electrochemical Properties Of Electrolyte Systems Between Charged Electrodes, Richard L. Rowley, Paul S. Crozier, Douglas Henderson Nov 2000

Molecular Dynamics Calculations Of The Electrochemical Properties Of Electrolyte Systems Between Charged Electrodes, Richard L. Rowley, Paul S. Crozier, Douglas Henderson

Faculty Publications

We investigate the interfacial electrochemical properties of an aqueous electrolyte solution with discrete water molecules in slab geometry between charged atomistic electrodes. Long-range intermolecular Coulombic interactions are calculated using the particle particle particle mesh method with a modification to account for the slab geometry. Density distribution profiles and potential drops across the double layer are given for 0, 0.25, and 1 M aqueous electrolyte solutions each electrode surface charges. Results are compared qualitatively with experimental x-ray scattering findings, other computer simulation results, and traditional electrochemistry theory. The interfacial fluid structure characteristics are generally in good qualitative agreement with the conclusions …

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Kinetic Characterization Of His-Tagged Cp47 Photosystem Ii In Synechocystis Sp. Pcc6803, Zhao Liang Li, Terry M. Bricker, Robert Burnap Nov 2000

Kinetic Characterization Of His-Tagged Cp47 Photosystem Ii In Synechocystis Sp. Pcc6803, Zhao Liang Li, Terry M. Bricker, Robert Burnap

Faculty Publications

Recently, construction of strains of Synechocystis sp. PCC6803 having a His6 extension (His-tag) of the carboxyl terminus of the CP47 protein has been reported (T.M. Bricker et al, Biochim. Biophys. Acta 1409 (1998) 50; M.J. Reifler et al., in: Garab, Pusztai (Eds.) Proc. XIth International Congress on Photosynthesis, 1998). While these initial reports suggest a minimal impact of the His-tag upon Photosystem (PS) II function, a more thorough analysis of the kinetic properties of the modified complex is essential. This communication reports on a more detailed kinetic analysis to assess possible perturbations of PS II due to the genetic addition …

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Eosinophil Major Basic Protein-1 Does Not Contribute To Allergen-Induced Airway Pathologies In Mouse Models Of Asthma, K. L. Denzler, S. C. Farmer, J. R. Crosby, M. Borchers, G. Cieslewicz, K. A. Larson, S. Cormier-Regard, N. A. Lee, J. J. Lee Nov 2000

Eosinophil Major Basic Protein-1 Does Not Contribute To Allergen-Induced Airway Pathologies In Mouse Models Of Asthma, K. L. Denzler, S. C. Farmer, J. R. Crosby, M. Borchers, G. Cieslewicz, K. A. Larson, S. Cormier-Regard, N. A. Lee, J. J. Lee

Faculty Publications

The relationship between eosinophils and the development of Ag-induced pulmonary pathologies, including airway hyper-responsiveness, was investigated using mice deficient for the secondary granule component, major basic protein-1 (mMBP-1). The loss of mMBP-1 had no effect on OVA-induced airway histopathologies or inflammatory cell recruitment. Lung function measurements of knockout mice demonstrated a generalized hyporeactivity to methacholine-induced airflow changes (relative to wild type); however, this baseline phenotype was observable only with methacholine; no relative airflow changes were observed in response to another nonspecific stimulus (serotonin). Moreover, OVA sensitization/aerosol challenge of wild-type and mMBP-1(-/-) mice resulted in identical dose-response changes to either methacholine …

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Parallel Phylogenetic Inference, Mark J. Clement, David Mclaughlin, Quinn O. Snell, Michael Whiting Nov 2000

Parallel Phylogenetic Inference, Mark J. Clement, David Mclaughlin, Quinn O. Snell, Michael Whiting

Faculty Publications

Recent advances in DNA sequencing technology have created large data sets upon which phylogenetic inference can be performed. However, current research is limited by the prohibitive time necessary to perform tree search on even a reasonably sized data set. Some parallel algorithms have been developed but the biological research community does not use them because they don’t trust the results from newly developed parallel software. This paper presents a new phylogenetic algorithm that allows existing, trusted phylogenetic software packages to be executed in parallel using the DOGMA parallel processing system. The results presented here indicate that data sets that currently …

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Potential Gene Conversion And Source Genes For Recently Integrated Alu Elements, Astrid M. Roy, Marion L. Carroll, Son V. Nguyen, Abdel Halim Salem, Michael Oldridge, Andrew O.M. Wilkie, Mark A. Batzer, Prescott L. Deininger Nov 2000

Potential Gene Conversion And Source Genes For Recently Integrated Alu Elements, Astrid M. Roy, Marion L. Carroll, Son V. Nguyen, Abdel Halim Salem, Michael Oldridge, Andrew O.M. Wilkie, Mark A. Batzer, Prescott L. Deininger

Faculty Publications

Alu elements comprise >10% of the human genome. We have used a computational biology approach to analyze the human genomic DNA sequence databases to determine the impact of gene conversion on the sequence diversity of recently integrated Alu elements and to identify Alu elements that were potentially retroposition competent. We analyzed 269 Alu Ya5 elements and identified 23 members of a new Alu subfamily termed Ya5a2 with an estimated copy number of 35 members, including the de novo Alu insertion in the NFI gene. Our analysis of Alu elements containing one to four (Ya1-Ya4) of the Ya5 subfamily-specific mutations suggests …

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Reading Between The Lines: Human Genomic Variation Induced By Line-1 Retrotransposition, Fang Miin Sheen, Stephen T. Sherry, Gregory M. Risch, Myles Robichaux, Ivane Nasidze, Mark Stoneking, Mark A. Batzer, Gary D. Swergold Nov 2000

Reading Between The Lines: Human Genomic Variation Induced By Line-1 Retrotransposition, Fang Miin Sheen, Stephen T. Sherry, Gregory M. Risch, Myles Robichaux, Ivane Nasidze, Mark Stoneking, Mark A. Batzer, Gary D. Swergold

Faculty Publications

The insertion of mobile elements into the genome represents a new class of genetic markers for the study of human evolution. Long interspersed elements (LINEs) have amplified to a copy number of about 100,000 over the last 100 million years of mammalian evolution and comprise ~15% of the human genome. The majority of LINE-1 (L1) elements within the human genome are 5' truncated copies of a few active L1 elements that are capable of retrotransposition. Some of the young L1 elements have inserted into the human genome so recently that populations are polymorphic for the presence of an L1 element …

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Emotion And Group Cohesion In Productive Exchange, Edward J. Lawler, Shane R. Thye, Jeongkoo Yoon Nov 2000

Emotion And Group Cohesion In Productive Exchange, Edward J. Lawler, Shane R. Thye, Jeongkoo Yoon

Faculty Publications

This study refines and experimentally tests a theory of relational cohesion that explains how and when actors become committed to one another in the context of multiactor exchange. The theory asserts that frequent social exchange results in (1) positive emotions that solidify and strengthen the person-to-group bond and (2) uncertainty reduction that renders the focal group more salient in relation to others. These two mechanisms produce a sense of psychological group formation and ultimately increase observable acts of commitment. In a “productive exchange” setting, three actors negotiate a joint venture that requires the assent of all members. The exchanges featured …

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The Integrity Of Death: Resolving Dilemmas In Medicine, Larry I. Palmer Nov 2000

The Integrity Of Death: Resolving Dilemmas In Medicine, Larry I. Palmer

Faculty Publications

No abstract provided.

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Dna Binding Properties Of The Arabidopsis Floral Development Protein Aintegumenta, Staci Nole-Wilson, Beth A. Krizek Nov 2000

Dna Binding Properties Of The Arabidopsis Floral Development Protein Aintegumenta, Staci Nole-Wilson, Beth A. Krizek

Faculty Publications

The Arabidopsis protein AINTEGUMENTA (ANT) is a member of a plant-specific family of transcription factors (AP2/EREBP) that share either one or two copies of an approximately 70 amino acid region called the AP2 repeat. DNA binding activity has been demonstrated previously for members of this family containing a single AP2 repeat. Using an in vitro selection procedure, the DNA binding specificity of the two AP2 repeat containing protein ANT was found to be 5'-gCAC(A/G)N(A/T)TcCC(a/g)ANG(c/t)-3'. This consensus site is much longer than sites recognized by proteins containing a single AP2 repeat and neither AP2 repeat of ANT was alone capable of …

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