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2007

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An Evaluation Of An Inshore Aquaculture Park For Sustainable Coastal Community Development, Vanesssa Maxwell Jan 2007

An Evaluation Of An Inshore Aquaculture Park For Sustainable Coastal Community Development, Vanesssa Maxwell

LSU Doctoral Dissertations

This dissertation addresses applying industrial park concepts to the development of aquaculture parks in public waters specifically for off-bottom triploid Easter oyster, Crassostrea virginica, culture. The objectives are to identify the permitting process, relevant agencies, and legislation needed to facilitate development of aquaculture parks in the Gulf of Mexico states, and test and analyze off-bottom oyster culture for commercial production of triploid oysters. Off-bottom culture can increase oyster production, but fouling organisms can reduce growth and survival rates. The Adjustable Longline System (ALS), commercially used in Australia, allows oyster bags to be suspended in the water column and positioned for …

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Evaluation Of Selected Immune Response To Haemonchus Contortus In Gulf Coast Native Compared To Suffolk Lambs, Krishna P. Shakya Jan 2007

Evaluation Of Selected Immune Response To Haemonchus Contortus In Gulf Coast Native Compared To Suffolk Lambs, Krishna P. Shakya

LSU Doctoral Dissertations

Haemonchus contortus is one of the major nematode parasites causing substantial economic losses in small ruminant farming worldwide. Recently, effect of anthelmintic treatment has decreased due to an increasing problem of nematode populations that have developed resistance to anthelmintics. There are certain breeds of sheep that are identified as being relatively resistant to the parasite including Gulf Coast Native (Native) sheep. Understanding the mode of immune response that helps these breeds of sheep control infection could help design vaccines and enhance control programs. This experiment was designed to evaluate the immunological responses of Native, compared with susceptible Suffolk sheep that …

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Sugarcane Tasseling Under Artificial Photoperiod Conditions As Affected By Nitrogen Rate And Temperature, Christopher Michael Laborde Jan 2007

Sugarcane Tasseling Under Artificial Photoperiod Conditions As Affected By Nitrogen Rate And Temperature, Christopher Michael Laborde

LSU Doctoral Dissertations

Optimizing flowering in the LSU AgCenter’s Sugarcane ( Sacchrum spp. hybrids) Breeding Program is an important step in the variety development program. The effect of nitrogen and ambient air temperature in pot cultured sugarcane were examined as a means of improving sugarcane flowering. The experiment was conducted on agronomic and reproductive traits of sugarcane at the Sugar Research Station, St. Gabriel, LA, on sugarcane genotypes subjected to artificial photoperiod regimes. The potting media consisted of equal parts of washed sand, Canadian peat moss, and a Commerce silt loam soil (fine-silty, mixed, nonacid, thermic aeric Fluvaquents). Early nitrogen (22.4-22.4-22.4 kg ha-1) …

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Development Of A Biomass Transducer For Automated Microalgal Bioreactors, Amar Shivaram Hegde Jan 2007

Development Of A Biomass Transducer For Automated Microalgal Bioreactors, Amar Shivaram Hegde

LSU Master's Theses

A highly sensitive miniaturized biomass transducer is necessary for continuous and reliable monitoring of the microalgal biomass in a computer controlled, automated microalgal bioreactor. Previous known methods to determine microalgal biomass applicable in these bioreactors are based on single wavelength turbidimetric or fluorescence. The objectives of this research were to (1) determine the light absorption characteristics of some commercially applicable microalgae in the electromagnetic wavelength range of 200-800 nm (2) design and construct a new miniaturized biomass transducer (3) process the transducer output to correlate with the biomass. Wavelength sensitivity analysis was conducted on the commercially important microalgal species - …

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A Study Of Auxiliary Be In African American English: A Comparison Of Children With And Without Specific Language Impairment, April W. Garrity Jan 2007

A Study Of Auxiliary Be In African American English: A Comparison Of Children With And Without Specific Language Impairment, April W. Garrity

LSU Doctoral Dissertations

This study’s purpose was to examine the use of auxiliary BE forms in African American English (AAE)-speaking children with and without language impairment. The impetus for this work was a lack of information in the literature about BE use in AAE as a function of form, language status, and tasks, and the relevance of this type of data for testing one theoretical model of childhood language impairment, the Extended Optional Infinitive account (EOI; Rice, Wexler, & Cleave, 1995). Thirty African Americans participated: 10 six-year-olds with specific language impairment (SLI); 10 age controls (AM); and, 10 language controls (LM). All of …

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Spatial Analysis Of The Preserved Wooden Architectural Remains Of Eight Late Classic Maya Salt Works In Punta Ycacos Lagoon, Toledo District, Belize, Bretton Michael Somers Jan 2007

Spatial Analysis Of The Preserved Wooden Architectural Remains Of Eight Late Classic Maya Salt Works In Punta Ycacos Lagoon, Toledo District, Belize, Bretton Michael Somers

LSU Doctoral Dissertations

This dissertation examined the remains of wooden architecture at eight Late Classic Maya sites found beneath the surface of Punta Ycacos Lagoon in southern Belize. The presence of briquetage on the surface and embedded among the clusters of wooden architectural features implies association with salt production activity. This research is significant in that the preservation of wooden structures at the salt works has not previously been reported for the ancient Maya. This dissertation includes a detailed discussion of documented evidence of salt production throughout Mesoamerica from archaeological, historical and modern examples. The discussion also addressed the evidence of Maya wooden …

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Higher Education Desegregation: An Analysis Of State Efforts In Systems Formerly Operating Segregated Systems Of Higher Education, Edwin H. Litolff, Iii Jan 2007

Higher Education Desegregation: An Analysis Of State Efforts In Systems Formerly Operating Segregated Systems Of Higher Education, Edwin H. Litolff, Iii

LSU Doctoral Dissertations

The landmark Supreme Court Decision of Brown v. the Board of Education in 1954 struck down the policy of separate but equal and set a legal precedent that racial discrimination in public education violates the United States constitution. Later the 1964 Civil Rights Act prohibited colleges and universities from discriminating based upon age, sex, race, or religion. The Civil Rights Act strengthened the enforcement capabilities of the Office of Civil Rights in ensuring desegregation. These legislative and judicial efforts have engaged higher education and state officials in often-controversial attempts to desegregate systems and institutions of higher education. Because colleges and …

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Environmental Factors Affecting The Distribution Of Native And Invasive Aquatic Plants In The Atchafalaya River Basin, Louisiana, U.S.A., Rachel Cathleen Walley Jan 2007

Environmental Factors Affecting The Distribution Of Native And Invasive Aquatic Plants In The Atchafalaya River Basin, Louisiana, U.S.A., Rachel Cathleen Walley

LSU Master's Theses

Over the last century, the aquatic macrophyte community of the Atchafalaya River Basin (ARB) has become increasingly dominated by invasive species. I used digital photography and GIS software to determine ARB macrophyte community composition by measuring percent cover of each plant species within five 0.25-m2 quadrats sampled from 108 sites in 2005 and 103 sites in 2006. Macrophyte community data and measurements of soil and water physicochemistry at each site were used to investigate environmental associations of the macrophytes inhabiting bayou, lake, excavated canal, and swamp habitats. Analyses indicated substantial differences in physicochemical conditions among habitats, but none of the …

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Demographic And Psychological Factors Influencing Academic Success In A College Level Human Anatomy Course, Wanda Green Hargroder Jan 2007

Demographic And Psychological Factors Influencing Academic Success In A College Level Human Anatomy Course, Wanda Green Hargroder

LSU Doctoral Dissertations

The primary purpose of this study was to determine the influence of selected demographic and psychological characteristics on the academic achievement of students enrolled in an undergraduate human anatomy course at a research-extensive university in the Southern region of the United States. As health care in the United States becomes increasingly strained due to a decreasing ratio of health care workers, educating more students to fill this gap has become a societal issue. Human anatomy forms the foundation of all health care professions. From the molecular to the macroscopic, anatomy provides a unique and necessary perspective of the human body. …

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A Home-Based Intervention To Promote Physical Activity In Low Income African American Adults, Dorothy Fauntleroy Whitehead Jan 2007

A Home-Based Intervention To Promote Physical Activity In Low Income African American Adults, Dorothy Fauntleroy Whitehead

LSU Doctoral Dissertations

Physical activity has long been regarded as a key component to a healthy lifestyle; however, the U.S. has disturbingly high rates of sedentary behavior and related chronic illnesses (National Center for Chronic Disease Prevention and Health Promotion, 2003). While many studies have attempted to address inactive lifestyle, few have reached out to high risk groups, such as African Americans and low income individuals. A recent review of the physical activity literature among African Americans called for more research with this population and encouraged future studies to focus on enduring exercise behavior (at least 6 months post intervention) and use theory-based …

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The Application Of Controlled Radical Polymerization Processes On The Graft Copolymerization Of Hydrophobic Substituents Onto Guar Gum And Guar Gum Derivatives, Veronica Holmes Jan 2007

The Application Of Controlled Radical Polymerization Processes On The Graft Copolymerization Of Hydrophobic Substituents Onto Guar Gum And Guar Gum Derivatives, Veronica Holmes

LSU Doctoral Dissertations

Guar gum is a naturally occurring polysaccharide; guar gum and its derivatives, such as carboxymethyl guar gum (CMG) are widely used in the oil and gas industry. A hydraulic fracturing fluid for rock formations to enhance oil recovery (EOR) is comprised of viscosifier, gelled CMG, and sand particles (proppants). The gel is mixed with proppant (sand) and pumped at high rate and high pressure into an oil/gas well to the hydrocarbon-producing zone. The applied pressure will force the rock formation to fracture allowing entry of the guar gel/sand mixture. The mixture then fills the resultant fracture. The viscosity of the …

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The Depression Scale For Severe Disability: A Diagnostic Tool For The Assessment Of Depression In Adults With Severe And Profound Intellectual Disabilities, Christopher Cooper Jan 2007

The Depression Scale For Severe Disability: A Diagnostic Tool For The Assessment Of Depression In Adults With Severe And Profound Intellectual Disabilities, Christopher Cooper

LSU Doctoral Dissertations

The Depression Scale for Severe Disability(DEPRESSED) is a clinically and empirically derived informant-report behavioral rating scale designed to measure depression in persons with severe and profound intellectual disabilities by assessing behavioral symptoms of depression. Behavioral symptoms of depression and item and factor analyses were used to construct the scale resulting in a 20-item four-factor solution producing factors that were labeled "Sleep"(F1), "Mood"(F2), "Skills"(F3), and "Motor"(F4). The DEPRESSED identified the core symptoms of depression including mood, anhedonia, sleep, appetite, fatigue, and psychomotor agitation and retardation. Internal consistency, interrater and test-retest reliability of the DEPRESSED scale were excellent. The DEPRESSED also demonstrated …

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"I Hear You, But I Don't Understand You": The Effects Of Peer Tutoring For Helping Secondary Esl Students Achieve Academic Success, Mary Pyron Jan 2007

"I Hear You, But I Don't Understand You": The Effects Of Peer Tutoring For Helping Secondary Esl Students Achieve Academic Success, Mary Pyron

LSU Doctoral Dissertations

When I began teaching 11th grade English in Houston, Texas, I quickly discovered that students who speak English as a second language are sometimes drastically under-prepared for the Texas Assessment of Knowledge and Skills (TAKS) test, the state’s high stakes test required during the 11th grade year. The result of their inability to pass the test is that they do not graduate, which limits their future career and academic choices. In a semester-long research study at a typical high school in Houston, Texas, I explored the possibility of assisting ESL/LEP students transplanted to Houston as they struggled with English proficiency …

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Manhood Constructions Among Engaged African American Male Collegians: Influences, Experiences, And Contexts, T. Elon Dancy Ii Jan 2007

Manhood Constructions Among Engaged African American Male Collegians: Influences, Experiences, And Contexts, T. Elon Dancy Ii

LSU Doctoral Dissertations

The manhood constructions and collegiate experiences of twenty-four engaged African American men enrolled across twelve, four-year colleges were explored. The purpose of this study was to inform colleges about the ways in which these men construct their manhood. The manifestations of these constructions in African American college men's behavior, enrollment, and campus engagement were also investigated. The participants, who represented a range of college engagement, were enrolled in colleges that are situated across the nineteen southern and border states of the United States of America. The institutional selection matrix was further disaggregated according to predominant population (HBCU, HWI) and institutional …

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Brucella Melitensis: The Evaluation Of A Putative Hemagglutinin Gene's Effect On Virulence In The Caprine Model, Quinesha Laticia Perry Jan 2007

Brucella Melitensis: The Evaluation Of A Putative Hemagglutinin Gene's Effect On Virulence In The Caprine Model, Quinesha Laticia Perry

LSU Doctoral Dissertations

Brucella melitensis is a facultative intracellular bacterial pathogen that causes abortions in goats and sheep and Malta fever in humans. The zoonotic disease brucellosis causes severe economic losses in the Mediterranean region and parts of Africa, Asia, and Latin America. With the completion of the genomic sequences of B. abortus 2308 and B. melitensis 16M, no classical virulence factors were found; and the chromosomes were virtually identical. However, in B. melitensis, a putative hemagglutinin gene was identified which is absent in B. abortus. The possibility of the hemagglutinin gene being a potential virulence factor was evaluated via gene replacement/deletion in …

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Assessment Of Thelypteris Palustris, Asparagus Sprengeri, And Lolium Perenne For Their Potential Use In The Phytoremediation Of Arsenic-Contaminated Soils, Lashunda L. Anderson Jan 2007

Assessment Of Thelypteris Palustris, Asparagus Sprengeri, And Lolium Perenne For Their Potential Use In The Phytoremediation Of Arsenic-Contaminated Soils, Lashunda L. Anderson

LSU Doctoral Dissertations

The goal of this study is to evaluate the potential of three plants, Thelypteris palustris (marsh fern), Asparagus sprengeri (asparagus fern), and Lolium perenne (perennial ryegrass) for use in phytoremediation of arsenic-contaminated soils. Specifically, the objectives of this study are to (1) confirm if arsenic accumulation occurs in the selected plants, (2) to examine morphological effects of arsenic in the selected plants, and (3) to evaluate the oxidation state of arsenic upon accumulation in the selected plants. The analytical method combination of ICP-MS, SEM, and XANES was used to accomplish the objectives of this study. The results indicate marsh fern, …

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Experimental And Modeling Studies Of Contaminant Transport In Capped Sediments During Gas Bubble Ebullition, Qingzhong Yuan Jan 2007

Experimental And Modeling Studies Of Contaminant Transport In Capped Sediments During Gas Bubble Ebullition, Qingzhong Yuan

LSU Doctoral Dissertations

Fluxes of the three organics and eighteen metals from sediments were measured with diffusion chambers, and the effectiveness of a sand cap ascertained. The influence of sediment consolidation on contaminant flux and the mass transfer coefficient at the sediment-water interface was studied. A two-layer diffusion-advection model and consolidation model were coupled to elucidate the effect of sediment consolidation on chemical transport in the sediment-cap system. The model was tested and verified by the experimental data from microcosms, and then was used to predict phenanthrene flux under field conditions. The simulation results showed that consolidation could accelerate phenanthrene breakthrough and enhance …

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The Black Church And Political Mobilization Of African Americans, Misty Noel Johnson Jan 2007

The Black Church And Political Mobilization Of African Americans, Misty Noel Johnson

LSU Master's Theses

This study investigates the political and social activities of black church congregations within a southern community by assessing the effectiveness of three churches in mobilizing their congregations and serving as channels for political communication. The study pays particular attention to the differences between affiliations within the black church, the influence of religious leaders on political involvement, attitudes regarding political involvement and political influences outside of the church. The thesis begins by placing the black church in its historical context —as a giver of spiritual and community orientation as well as a social and political mobilization agent. Using survey results from …

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Effect Of Adapted Phonic Faces Story Books On Phonological Skills Of Children With Severe Expressive Language Disorders, Meher Hormazd Banajee Jan 2007

Effect Of Adapted Phonic Faces Story Books On Phonological Skills Of Children With Severe Expressive Language Disorders, Meher Hormazd Banajee

LSU Doctoral Dissertations

Although No Child Left Behind (2001) encourages the inclusion of all children within the regular curriculum, children with severe speech and physical disabilities rarely are provided with the literacy education provided to grade-level peers. This study taught alphabetic skills to three children with severe speech and physical impairments in the context of traditional alphabet books versus Phonic Faces Storybooks. Both storybooks were converted into e-books using Microsoft Office PowerPoint (Microsoft Office, 2003) and accessed using a single rocking lever switch. Two graphemes were selected based on incorrect responses from the pretest administration of the The Phonological Awareness Test (Roberson & …

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Shear Responses Of Poly(Ethylene Oxide)-Laponite Nanocomposite Hydrogels, Elena Loizou Jan 2007

Shear Responses Of Poly(Ethylene Oxide)-Laponite Nanocomposite Hydrogels, Elena Loizou

LSU Doctoral Dissertations

This research seeks to understand the structure and shear responses of poly(ethylene oxide)-Laponite nanocomposite hydrogels and to relate the macroscopic physical properties to the nanoscopic structural changes. Understanding that relationship is necessary, in order to tailor material properties to specific applications. Information on the structure at rest on multiple length scales was obtained by combining microscopic and neutron scattering techniques. The structural changes that occur in response to a shear field were explored using rheology and neutron scattering. These structures were examined as a function of polymer molecular weight, polymer and clay concentrations, and sample preparation method. While the sample …

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The Influence Of Controllability On College Women's Efficacy And Attributions In Physical Activity, Julie Franks Gill Jan 2007

The Influence Of Controllability On College Women's Efficacy And Attributions In Physical Activity, Julie Franks Gill

LSU Doctoral Dissertations

There is evidence that individuals’ attributional patterns are important determinants of behavior. Controllability had been identified as an influential dimension of causal attributions. When individuals believe their actions have an effect, or control, on the outcome of an event, they are more likely to engage in a behavior. Contingency of feedback can be used to manipulate perceptions of controllability. The purpose of this study was to investigate the effect of controllability on causal attributions, efficacy, and performance in an exercise setting, using a design that accounts for explanatory styles. It was hypothesized that non-contingent outcomes on an initial task would …

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Quintet For Two Violins, Viola, Cello And Piano, And String Quartet No. 1 By Lazar Nikolov, Alexandra Dotcheva Jan 2007

Quintet For Two Violins, Viola, Cello And Piano, And String Quartet No. 1 By Lazar Nikolov, Alexandra Dotcheva

LSU Doctoral Dissertations

Lazar Nikolov (1922-2005) was a representative of the so-called third generation of Bulgarian composers. Together with his closest friend, composer and conductor Konstantin Iliev, Nikolov founded the postwar avant garde in Bulgaria. He was among the first composers in Eastern Europe to abandon the influence of musical folklore and employ non-tonal techniques. Shortly before graduating from the State Academy of Music in 1946, Nikolov felt that the masters from the previous two generations had already used all the successful means to incorporate neo-Romantic features and Bulgarian folk material into art music. He was perceptive enough to recognize the danger of …

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Genetics Of Herpes Simplex Virus Type-1 Tegument Proteins Involved In Virion Morphogenesis And Egress, Preston A. Fulmer Jan 2007

Genetics Of Herpes Simplex Virus Type-1 Tegument Proteins Involved In Virion Morphogenesis And Egress, Preston A. Fulmer

LSU Doctoral Dissertations

Herpes simplex virus type-1 (HSV-1) morphogenesis occurs in multiple stages within infected cells. Initially, the virion capsid assembles within the nucleus and buds through the nuclear membrane into the cytoplasm. Within the cytoplasm, additional tegument proteins attach to the capsid and the fully tegumented capsids bud into trans-Golgi network (TGN) derived vesicles. Enveloped virions are ultimately secreted to extracellular spaces. The process by which the cytoplasmic capsids bud into TGN-derived vesicles is not well understood. The prevalent model calls for specific interactions among viral tegument proteins and membrane proteins and glycoproteins embedded within TGN membranes. To further investigate the roles …

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Probing The Association Behavior Of Hydrophobic Organic Compounds With Dissolved Humic Materials, Hadi M. Marwani Jan 2007

Probing The Association Behavior Of Hydrophobic Organic Compounds With Dissolved Humic Materials, Hadi M. Marwani

LSU Doctoral Dissertations

The association mechanism between hydrophobic organic compounds (HOC) and dissolved humic materials (DHM) has continued to be one of the interesting areas in environmental applications. The goal of the research reported in this dissertation is to investigate the association behavior of HOC with DHM. The first part of this research involves steady-state fluorescence measurements of these multi-component systems to study the effect of DHM content on the association mechanism of HOC, in particular using pyrene as a model. Results showed that steady-state fluorescence alone may not provide enough information about the quenching mechanism of pyrene with DHM. Lifetime based fluorescence …

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Analysis Of The Association Between Socio-Demographic Variables, Juvenile Offending, And Formal Vs. Informal Juvenile Justice System Handling In A Non-Urban Sample, Stephen W. Phillippi, Jr. Jan 2007

Analysis Of The Association Between Socio-Demographic Variables, Juvenile Offending, And Formal Vs. Informal Juvenile Justice System Handling In A Non-Urban Sample, Stephen W. Phillippi, Jr.

LSU Doctoral Dissertations

PURPOSE: This study compares and contrasts first-time juvenile offenders enrolled in a community-based intervention program whose cases were processed either informally or formally, and examines empirically- and conceptually-relevant contributors to re-offending. METHODS: This is a longitudinal, secondary analysis of 1072 male and female offenders. The study includes descriptive univariate analyses; chi-square bivariate analyses of each independent variable with the dependent variables (level of processing and recidivism at both one and three years); and binary logistic regression analyses to identify significant predictors of the dependent variables. Independent variables include age, gender, race, family structure, marital status of biological parents, family income, …

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Identifying Effective And Ineffective Schools For Accountability Purposes: A Comparison Of Four Generic Types Of Accountability Models, Fen Yu Jan 2007

Identifying Effective And Ineffective Schools For Accountability Purposes: A Comparison Of Four Generic Types Of Accountability Models, Fen Yu

LSU Doctoral Dissertations

The stakes associated with student performance have been raised to new highs under the No Child Left Behind Act (NCLB, 2001). Many people are concerned with the adequacy and appropriateness of the statistical models used in identifying low-performing schools for educational accountability. The purpose of this study was to compare four generic types of accountability models (i.e., status models, improvement models, growth models, and value-added models) and see if they reach consistent/inconsistent conclusions regarding the effectiveness of the same set of schools. Further, the four models were also compared in terms of “fairness”. A fair model is defined as one …

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Spatial Econometric Analysis Of Agglomeration Economies Associated With The Geographical Distribution Of The U.S. Biotech Industry, Pramod Reddy Sambidi Jan 2007

Spatial Econometric Analysis Of Agglomeration Economies Associated With The Geographical Distribution Of The U.S. Biotech Industry, Pramod Reddy Sambidi

LSU Doctoral Dissertations

This dissertation analyzed spatial agglomeration economies associated with the geographical distribution of the U.S. biotech industry. Three location issues associated with the biotech industry were addressed in the study. The first study utilized a Bayesian spatial tobit model and examined the overall and regional differences in factors affecting the location of the U.S. biotech industry. The second study examined the inter- and intra-industry spatial association of biotech related research and development (R&D) and testing facilities across all contiguous U.S. counties employing a Spatial Two-Stage Least Squares model. Finally, the interdependence between different subsectors of the U.S. biotech industry was analyzed …

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The Microeconomics Of International Price Dispersion, Ozlem Inanc Jan 2007

The Microeconomics Of International Price Dispersion, Ozlem Inanc

LSU Doctoral Dissertations

This dissertation investigates the reasons behind international price dispersion. The first essay, “International Price Dispersion and the Direction of Trade”, discusses the importance of trade cost as a determinant of international price dispersion. The importance of trade costs in segmenting product markets can not be captured by considering aggregate prices or in the absence of information on the direction of trade. The first essay, addresses this problem by utilizing product-specific prices along with cross-sectional productivity measures and bilateral trade flows that allow us to identify the probable source of any one product. The empirical approach used in this work is …

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Effects Of Aversive Conditioning On Behavior Of Nuisance Louisiana Black Bears, Jennifer Leigh Jan 2007

Effects Of Aversive Conditioning On Behavior Of Nuisance Louisiana Black Bears, Jennifer Leigh

LSU Master's Theses

Consistent habitat loss and fragmentation are contributing factors to the rise of human-bear conflicts in south Louisiana. Complaints associated with nuisance activities of Louisiana black bears (Ursus americanus luteolus) experienced in this region have steadily increased since 2000, requiring intervention by state and federal agencies. As a threatened species, Louisiana black bears require non-lethal management referred to as aversive conditioning. We used rubber buckshot and dogs to test the effectiveness of management techniques used by the state to deter nuisance activity by black bears. Eleven bears, representing approximately 15% of the estimated population in this region, were captured in residential …

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Isolation And Characterization Of The Siamese Family: A Novel Class Of Cell Cycle Regulators In Plants, Michelle Lynn Churchman Jan 2007

Isolation And Characterization Of The Siamese Family: A Novel Class Of Cell Cycle Regulators In Plants, Michelle Lynn Churchman

LSU Doctoral Dissertations

Recessive mutations in the SIAMESE (SIM) gene of Arabidopsis result in multicellular trichomes harboring individual nuclei with a low ploidy level, a phenotype strikingly different from that of wild-type trichomes, which are single cells with a nuclear DNA content of approximately 16-32C. These observations suggested that SIM is required to suppress mitosis as part of the switch to endoreplication in trichomes. We demonstrate that SIM encodes a novel 14kD protein that is part of a small Arabidopsis gene family comprised of four members. Homologs exist in other dicots and in monocots, although no obvious animal homologs have been identified. SIM …

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