Digital Commons Network^™

Regulation Of Root-Associated Methanotrophy By Oxygen Availability In The Rhizosphere Of Two Aquatic Macrophytes, Aram Calhoun, Gary M. King

Faculty Publications

The relative importance of oxygen for root-associated methanotrophy was examined by using sediment-free, intact freshwater marsh plants (Pontederia cordata and Sparganium eurycarpum) incubated in split chambers. The root medium contained approximately 100 μM methane. Methane oxidation was calculated from the difference between methane loss from chambers in the presence and absence of 1 mM 1-allyl-2-thiourea, a methanotrophic inhibitor. When the root medium was oxic, methane oxidation accounted for 88 and 63% of the total methane depletion for S. eurycarpum and P. cordata, respectively; the remainder represented diffusional loss to the atmosphere via roots, stems, and leaves. Under suboxic conditions, methane …

Louisiana Agriculture Magazine, Winter 1997, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

Variational Methods, Bounds, And Size Effects For Composites With Highly Conducting Interface, Robert Lipton

Faculty Publications

New variational principles are developed for the effective conductivity tensor for anisotropic two-phase electric conductors. Here the interface between phases is assumed to be highly conducting. Extra geometric information is encoded into the principles through the solution operators of simpler transport problems. These operators can be expressed as gradients of simple layer potentials with densities supported on phase interfaces or in terms of simple Dirichlet problems inside each phase region. New upper bounds on the effective conductivity are found that depend upon component volume fractions, a surface energy tensor and a scale-free matrix of parameters. This matrix corresponds to the …

Reciprocal Relations, Bounds, And Size Effects For Composites With Highly Conducting Interface, Robert Lipton

Faculty Publications

We provide a reciprocal relation linking the effective conductivity of a composite with highly conducting phase interfaces to that of a composite with the same phase geometry but with an electrical contact resistance at phase interfaces. A field relationship linking the electric field inside a composite with highly conducting phase interfaces to the current in a composite with contact resistance between phases is found. New size effects exhibited by isotropic particulate suspensions with highly conducting interface are obtained. The effective properties of periodic composites are shown to be monotonically increasing as the size of the period cell tends to zero. …

Lsu General Catalog 1997-1998, Louisiana State University And Agricultural And Mechanical College

LSU General Catalog

The LSU General Catalog describes all undergraduate and graduate departments and programs with degree requirements and courses offered for each one. The General Catalog includes information on registration and financial aid as well as academic services offered to all students.

Effects Of Environmental Sodium Chloride On Percent Hatch, Yolk Utilization, And Survival Of Channel Catfish Fry, C. R. Weirich, T. R. Tiersch

Faculty Publications

Only limited research has addressed the effect of salinity on hatching of channel catfish Ictalurus punctatus eggs, and no studies have evaluated the effect of salinity on fry development and survival. This study was undertaken to determine the effect of environmental sodium chloride (0, 1, 2, and 4 g/L NaCl) on percent hatch, yolk utilization, and survival of channel catfish fry. Experiments were conducted in recirculating systems using seven egg masses (1-2 d old). Each egg mass was divided into smaller portions which remained undissociated or were dissociated with sodium sulfite (NaSO3). Eggs were incubated until hatching. Wet and dry …

Injection Of Species Under Electrical Field To Enhance Bioremediation., Fazle Rabbi

LSU Historical Dissertations and Theses

Electrokinetics is one of the most viable alternatives for injecting/extracting water, organic and ionic species in low permeability soils as well as heterogeneous media because the transport processes are independent of the pore sizes. A better understanding of the principles offers the opportunity to employ multi-component species transport under electrical fields to inject electron acceptors, nutrients and other process additives for enhancement of in-situ bioremediation in low permeability and heterogeneous media. This study assesses the potential to employ and exploit the principles of multi-component species transport under electrical fields as mean to supplement, enhance and engineer in-situ bioremediation. It was …

The Moral Atmosphere Of The Elementary School And The Question Of Gender., Suzanne Beauclair Roy

LSU Historical Dissertations and Theses

The purpose of this qualitative study was to explore the moral atmosphere of the elementary school and ask: How does the elementary school principal contribute to the moral atmosphere of the elementary school? In addition to this question, this study also explored the likenesses and differences between male principals and female principals in regard to the degree to which the principal practiced either an "ethic of care" or an "ethic of justice." Four case studies were constructed using data collected from observations and interviews that were conducted in four elementary schools. Also, two female principals and two male principals were …

Fathers As Intervention Agents: Parent Training With Fathers Of Children With Developmental Disabilities., Deirdre West Russell

LSU Historical Dissertations and Theses

Previous research on parent training with children who have developmental disabilities has typically failed to include fathers. Compared to research on mothers of children with disabilities and fathers of normally developing children, little is known about fathers of children who have disabilities. In the present study, effects of behavioral parent training on fathers' parenting behaviors (instruction giving, positive attention, and correct consequences) were evaluated. The experimenter trained four fathers of children with developmental delays in the home using written handouts, verbal instructions, modeling, and performance feedback. Training was directed at increasing correct use of fathers' instruction giving, positive attention following …

Implementing Computer-Assisted Language Learning In An Esl Program Serving Adult Refugees From Vietnam: Findings From A Qualitative Case Study., Susan Mary Weishar

LSU Historical Dissertations and Theses

This qualitative case study explored the implementation of computer-assisted language learning (CALL) in an ESL program serving adult refugees and immigrants from Vietnam. The case consisted of two sub-cases: implementation of CALL in the beginners' class and implementation of CALL in the advanced beginners' class. The investigation, which lasted 46 weeks, was intense and holistic. The researcher was also the administrator of the refugee program. The research methodology used was largely qualitative in design, so that an emic understanding of how the innovation impacted the actors and brought about change in the learning environment could be constructed. Quantitative research methods …

Optimization And Scale-Up Of Thiarubrine A Production From Hairy Root Cultures Of Ambrosia Artemisiifolia., Santosh G. Bhagwath

LSU Historical Dissertations and Theses

Thiarubrine A (TA), a plant secondary metabolite synthesized by members of the family Asteraceae possesses antifungal and antiviral properties and is a potential pharmaceutical. The objective of the work was the optimization and scale-up of a bioprocess for the production of TA using hairy root cultures of Ambrosia artemisiifolia. At the inception of the work an established hairy root culture of the model system was used as inoculum in reactor experiments for the development of a protocol for the quantification of TA and in subsequent shake flask experiments to determine optimum culture conditions. TA accumulation closely paralleled growth and then …

The Screen For Adolescent Violence Exposure (Save): Development And Validation., Teresa L. Hastings

LSU Historical Dissertations and Theses

Increased interest in how violence exposure might relate to posttraumatic stress disorder (PTSD) and other adolescent psychopathology has created considerable demand for an assessment tool to assist in this research effort. Though attempts have been made to improve the measurement standards for violence research on youth, available instruments lack adequate psychometric qualities, comprehensiveness, or an acceptable format for slow readers. The present study provided empirical evidence on the utility of the Screen for Adolescent Violence Exposure (SAVE), an instrument designed to both correct the deficiencies of previous measures and to assess violence exposure for school, home, and neighborhood settings. The …

Experimental Analysis Of Aggression., Bethany Ann Marcus

LSU Historical Dissertations and Theses

In 1982, Iwata, Dorsey, Slifer, Bauman, and Richman developed a systematic assessment method to identify the operant functions of self-injurious behavior. In this study, the Iwata et al., method was used to assess the operant functions of aggression displayed by children and adolescents with developmental disabilities. Although researchers have demonstrated that aggression serves operant functions, there has been no comprehensive analysis of aggression using the Iwata et al. method. Twelve children and adolescents participated. The experimental conditions from the Iwata et al. method were replicated (i.e., attention, instructional demand, play, no interaction); also, a tangible positive reinforcement condition was included …

Technology In The English Composition Classroom: Freshman Composition Students Using The Internet To Plan Assignments And Conduct Research., Michael Allen Mccord

LSU Historical Dissertations and Theses

The use of computer and electronic communication and network technology is becoming increasingly important not only in society in general, but also in the college-level English composition classroom. These technologies amount to what some researchers term "multilayered literacies" or "new grammars." However, there have been few systematic studies of how students actually use these technologies. The current research presents a descriptive/naturalistic study of how students both learn and use the new electronic technologies as they accomplish research for, and respond to, a college-level writing assignment. This study examines the use of computers and networks by eight case study participants in …

Spectroscopic Analyses Of Excited-State Phenomena In Organized Media: Proton Transfer And Photoisomerization And Measurement Of Modified Low Density Lipoproteins Using Rapid-Mixing Multidimensional Stopped-Flow Spectroscopic Methods., Eric Lamar Butler-Roberts

LSU Historical Dissertations and Theses

The research presented in this dissertation generally involves aspects of molecular spectroscopy and contains two areas of focus. In the first section, the influences of organized media on the excited-state phenomena of intramolecular proton transfer (ESIPT) and photoisomerization have been investigated. Specifically, the photochemical properties of the novel ESIPT molecule 10-hydroxybenzo(h) quinoline (HBQ), as well as 2-(2$\sp\prime$-hydroxyphenyl)benzazoles (HBAs), have been examined in the presence of cyclodextrins (CDs) and micelles using absorbance, steady-state, and time-resolved emission spectroscopies. Additionally, the influence of cyclodextrins upon the photoisomerization of trans-stilbene (TS) has been studied. Results from spectroscopic studies of HBQ and HBAs in organized …

Reductive Precipitation Of Uranium By Free And Immobilized Cells And Cell Fractions Of Facultative And Anaerobic Bacteria., Boyce Lamont Clark

LSU Historical Dissertations and Theses

This study examines the interaction between two genera of bacteria and the biochemical reduction of uranium. The bacteria studied are the obligate anaerobe, Desulfovibrio desulfuricans, and the facultative aerobe, Escherichia coli. Preliminary experiments established the pH, cell concentration, substrate concentration, and type of substrate that favored reduction of hexavalent uranium in aqueous solutions. Uranium reduction is most complete at pH 7 and 9, with cell concentrations of at least 33.5 mg/ml (dry cell weight). Whole cells of D. desulfuricans were found to reduce uranium in the presence of lactate and hydrogen whereas in E. coli, reduction was achieved only in …

Coupled Field Equations For Saturated Soils And Its Application To Piezocone Penetration And Shield Tunneling., Murad Yusuf Abu-Farsakh

LSU Historical Dissertations and Theses

An elasto-plastic coupled system of equations are formulated here in order to describe the time-dependent deformation of saturated cohesive soils. Formulation of these equations is based on the principle of virtual work and the theory of mixtures for inelastic porous media as proposed by Prevost (1980) and Kiousis and Voyiadjis (1988). The saturated soil is considered as a mixture consisting of two deformable media, the solid grains and the water. Each medium is regarded as a continuum and follows its own motion. The coupled equations are developed for large deformations with finite strains in an updated Lagrangian reference frame. The …

Development And Implementation Of The Body Logic Program For Adolescents: A Primary Prevention Program For Eating Disorders., Paula Jonniece Varnado

LSU Historical Dissertations and Theses

Eating disorder symptoms such as feelings of fatness, restrictive eating and purgative behaviors are observed in many children and adolescents. These feelings and behaviors, may, in some adolescents lead to the development of anorexia nervosa and bulimia nervosa. A recent series of studies has identified risk factors for the development of eating disorder behaviors in children and adolescents. These risk factors include overconcern with physical appearance, negative evaluation of physical appearance, social pressure for thinness, higher weight level, depression, and body dysphoria. It has been hypothesized that targeting adolescents who are at risk for developing an eating disorder may result …

Flight Muscle Histolysis In The Female House Cricket, Acheta Domesticus., Rush Hoyet Oliver

LSU Historical Dissertations and Theses

Flight muscle histolysis was investigated in the dorsal longitudinal muscles (DLMs) of the cricket. Histolysis in the DLMs was characterized by analysis of total protein content, tissue wet weight, and relative percent muscle shortening. Initial declines of total protein indicated the JH signal initiating histolysis occurred by Day 2. Histolysis was essentially complete by Day 3. Ligation of Day 1 crickets prevented histolysis but this inhibition could be prevented by continual topical treatments with methoprene. Ligation of Day 2 crickets did not prevent histolysis. A requirement for active protein expression was demonstrated by analysis of synthesis block by cycloheximide and …

Gumbo Yearbook, Class Of 1997, Louisiana State University And Agricultural And Mechanical College

Gumbo Yearbook

The Gumbo yearbook chronicles the entire academic year at LSU. In words and especially photos, the Gumbo shows the people, places, and events that make each year unique. In addition to formal portraits of schools and departments, the book contains hundreds of snapshots of students with their friends and dozens of pages showcasing organizations.

An Integrated Model Predicting Smoking Stage Of Change Among A Sample Of Government-Insured And Indigent Medical Patients., Edwin Daniel Boudreaux

LSU Historical Dissertations and Theses

This study found that an integrated model using variables from several psychosocial theories, including the theory of planned behavior, decisional balance theory, and self-efficacy theory, was successful in predicting smoking stage of change. Specifically, ever smokers with higher self-efficacy, higher ratings of the cons of smoking, and lower ratings of the pros were more ready to quit or had already quit. Additionally, those who rated smoking as less tempting and who reported having people in their support system who were supportive of their cessation were in later stages of change. These results point to the importance of assessing cognitions towards …

Activation Of Δ-Globin Gene Expression By Erythroid Krupple-Like Factor: A Potential Approach For Gene Therapy Of Sickle Cell Disease, David Donze, Paxson H. Jeancake, Tim M. Townes

Faculty Publications

Hemoglobin A2 (HbA2; α2δ2) is a powerful inhibitor of HbS (α2β2/(S) polymerization. However, HbA2 levels are normally low in sickle cell patients. We show that a major reason for low δ-globin gene expression is the defective CACCC box at -90 in the δ-globin promoter. When the CACCC box defect in δ is corrected, expression of an HS2 δ/Luciferase reporter is equivalent to HS2 β/Luciferase. Erythroid Krupple-like factor (EKLF), which binds to the CACCC box of the β-globin gene and activates high-level expression, does not bind to the normal δ-globin promoter. Our goal is to design a modified EKLF that binds …

Louisiana Agriculture Magazine, Fall 1996, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

Theory And Operation Of Continuous Flow Systems For The Study Of Benthic-Pelagic Coupling, Tina Miller-Way, Robert R. Twilley

Faculty Publications

Continuous flow systems have not been widely used in the study of benthic-pelagic coupling in marine systems. This paper discusses the theoretical and practical use of continuous flow sysrems for the study of benthic exchange processes and presents the results of experiments which compared continuous flow (open) and closed (batch) systems and investigated the sensitivity of exchange rates to residence times in a continuous flow system. Continuous flow systems minimize the problem of environmental dependency of benthic-pelagic exchange rates by maintaining initial experimental conditions throughout an incubation. However, the selection of a supply rate (i.e. residence time) is critical in …

Louisiana Agriculture Magazine, Summer 1996, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

Solution Conformation Of De Novo Antimicrobial Peptides, Maryam Javadpour

LSU Historical Dissertations and Theses

De novo antimicrobial peptides were designed to help study the necessary conformational properties of biologically active peptides. One set of peptides are: (KLAKKLA)n, (KLAKLAK)n, (n=l, 2, 3), (KALKALK)3, (KLGKKLG)n, and (KAAKKAA)n (n=2,3), while the second set have phenylalanine substituted for leucine, (KFAKFAK)3 and (KFAKKFA)n, (n=3,4). These peptides were designed. to be perfectly amphipathic in helical conformations.

Circular dichroism was used to study their secondary structure in aqueous solution, sodium dodecylsulfate micelles, and phospholipid vesicles. Peptide antibacterial activity was tested against E. coli, P. aeruginosa, and S. aureus. Peptide cytotoxicity was tested against a mammalian cell line, 3T3 mouse fibroblasts. Our …

Louisiana Agriculture Magazine, Spring 1996, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

Gumbo Yearbook, Class Of 1996, Louisiana State University And Agricultural And Mechanical College

Gumbo Yearbook

The Gumbo yearbook chronicles the entire academic year at LSU. In words and especially photos, the Gumbo shows the people, places, and events that make each year unique. In addition to formal portraits of schools and departments, the book contains hundreds of snapshots of students with their friends and dozens of pages showcasing organizations.

Pilot-Scale Solvent Sublation For The Removal Of Hydrophobic Compounds From Wastewaters., Jeffrey Scott Smith

LSU Historical Dissertations and Theses

Solvent sublation is a nonfoaming adsorptive bubble process which exploits the surface active nature of organic compounds in their removal from aqueous systems. Gas bubbles are introduced into an aqueous media and are buoyed upward to an immiscible organic solvent. As the bubbles rise, organic materials are selectively adsorbed from the aqueous phase and transported to the overlying, quiescent solvent layer. This dissertation studied three-phase, continuous solvent sublation of pyrene and pentachlorophenol from simulated wastewater at the pilot-scale. Steady-state removal efficiencies as high as 96% for pyrene and 94% for pentachlorophenol were demonstrated and were significantly greater than the corresponding …

Famine, Plague, And Greed: Socio-Historical Factors Affecting The Development Of The Middle English Dialect Of London., George Vincent Yonek

LSU Historical Dissertations and Theses

A significant factor in the rise of Standard English was the importance of London as a center of commerce and government, yet the foundation for Modern Standard English is not derived from the Southern dialects, which heavily influenced London in the late Old English and early Middle English period. The variety of English we speak and write today is derived mainly from the East Midland dialect and, to a lesser extent, the North in late Middle English. The purpose of this thesis is to explore the socio-historical causes behind this change in the distribution of features of the London dialect. …