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Floral Ontogeny Of Mimosoid Legumes., Jose Israel Ramirez-Domenech Jan 1989

Floral Ontogeny Of Mimosoid Legumes., Jose Israel Ramirez-Domenech

LSU Historical Dissertations and Theses

Comparative floral ontogeny in mimosoid legumes was analyzed among representative genera in three major tribes Mimoseae, Acacieae and Ingeae. Details on floral and inflorescence ontogeny in one mimosoid species is described and illustrated for Mimosa strigillosa Torr. & Gray. Three features studied developmentally include: variation in number of parts, patterns of arrangement and inflorescence architecture. Suppression occurs along inflorescences that develop synchronously, when basal flowers are retarded. Tetramerous flowers are considered a reduction or suppression from basic pentamerous flower. Divergent patterns in order of sepal initiation and stamen initiation and proliferation are found during early ontogeny. Four patterns found in …

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Habitat Differentiation Of Iris Fulva Ker Gawler, Iris Hexagona Walter, And Their Hybrids., Bobby Dale Bennett Jan 1989

Habitat Differentiation Of Iris Fulva Ker Gawler, Iris Hexagona Walter, And Their Hybrids., Bobby Dale Bennett

LSU Historical Dissertations and Theses

Iris fulva and Iris hexagona have overlapping geographic ranges in Louisiana; in areas of overlap hybrids are fairly common. Iris hexagona occupies the borders of freshwater marshes of southern Louisiana while I. fulva can be found farther north along edges of natural levees, canals and swamps. An area of hybridization (hybrid zone) can be found where bayous penetrate the freshwater marsh. The objective of this research was to investigate some of the factors affecting habitat differentiation of I. fulva, I. hexagona, and their natural hybrids ("Hybrid Purple" and "Hybrid Red"). A three year field study was conducted to determine the …

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Isolation And Characterization Of A Rhodobacter Capsulatus Biob Mutant Using A Novel Method To Screen For Strains Unable To Synthesize Heme., Rhonda Diane Cardin Jan 1989

Isolation And Characterization Of A Rhodobacter Capsulatus Biob Mutant Using A Novel Method To Screen For Strains Unable To Synthesize Heme., Rhonda Diane Cardin

LSU Historical Dissertations and Theses

The common tetrapyrrole pathway of the photosynthetic bacterium, Rhodobacter capsulatus, ultimately leads to the synthesis of bacteriochlorophyll, heme, vitamin B-12, and siroheme. Molecular analysis of tetrapyrrole biosynthesis has been limited due to a lack of mutants. This study describes the isolation and characterization of a biotin-requiring mutant of R. capsulatus unable to synthesize heme. Growth conditions were established to allow selection and characterization of heme-deficient strains of R. capsulatus. A screening method was developed to isolate strains of R. capsulatus unable to synthesize heme. Tn5 derivatives of a bchB strain that exhibited an altered ability to synthesize the fluorescent porphyrin …

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Wave Height Changes And Mass Transport On Tague Reef, A Caribbean Reef, North Coast Of St. Croix, U.S. Virgin Islands., Alexis Lugo-Fernandez Jan 1989

Wave Height Changes And Mass Transport On Tague Reef, A Caribbean Reef, North Coast Of St. Croix, U.S. Virgin Islands., Alexis Lugo-Fernandez

LSU Historical Dissertations and Theses

This study of wave and current transformations across a modern coral reef was conducted on Tague Reef, St. Croix (U.S.V.I.), during late March and early April 1987. The project objective was to improve our understanding of the magnitudes, frequencies, and spatial and temporal variations of waves and currents as they interact with a modern reef. Data were collected in 4 experiments over a 2-week period. During the experiments, atmospheric and sea state conditions were typical of Caribbean-Atlantic trade wind dominated areas. Results verify that infragravity waves of 27.7 min period and diurnal tides modulated high frequency wave and current processes. …

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Sulfur Chemistry Of Louisiana Tidal Marsh Soils., Nawarat Krairapanond Jan 1989

Sulfur Chemistry Of Louisiana Tidal Marsh Soils., Nawarat Krairapanond

LSU Historical Dissertations and Theses

The amounts and profile distribution of various sulfur forms in Louisiana coastal marshes were investigated to understand sulfur cycling as related to the origin and type of tidal wetland marshes. Sampling was conducted quarterly from a Panicum hemitomon freshwater marsh, a Spartina patens brackish marsh, and a Spartina alterniflora salt marsh in Barataria Basin, Louisiana. Soil samples were fractionated into acid-volatile sulfides (AVS), elemental sulfur, HCl-soluble sulfur, pyrite sulfur, ester-sulfate sulfur, carbon-bonded sulfur, and total sulfur. Seasonal changes showed a greater effect on the distribution of S fractions in brackish and salt marsh than in the freshwater marsh. Season appeared …

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Characterization Of The Transcriptional Properties Of Equine Infectious Anemia Virus., Siyamak Rasty Jan 1989

Characterization Of The Transcriptional Properties Of Equine Infectious Anemia Virus., Siyamak Rasty

LSU Historical Dissertations and Theses

The transcriptional properties of equine infectious anemia virus were examined in two distinct equine cell lines in which the virus establishes either a persistent or a cytopathic infection. Northern hybridization analyses were performed to determine the number, sizes, and relative levels of the EIAV transcripts encoded during persistent or cytopathic infections. Three species of viral mRNA were detected in infected cells: an 8.2-kb full-length genomic mRNA, a 3.5-kb single-spliced mRNA, and a low abundance 1.5-kb mRNA, presumably formed by a double-splicing event of the full-length mRNA. Analysis of the levels of EIAV-specific RNA's present during persistent and cytopathic infections has …

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Behavior Of The American Alligator In A Louisiana Freshwater Marsh., William Lee Rootes Jan 1989

Behavior Of The American Alligator In A Louisiana Freshwater Marsh., William Lee Rootes

LSU Historical Dissertations and Theses

Stomachs from 706 alligators (Alligator mississippiensis) harvested from a southern Louisiana fresh marsh in 1987 and 1988 were examined for web tags from smaller marked alligators. Alligators $$2.73 m TL) were significantly more cannibalistic than smaller alligators (P $<$ 0.0001). Males and females were cannibalized in the same proportion they occurred in the population. Cannibalism mortality appeared to be distributed proportionately among all cohorts in the 0.35-2.12 m TL size classes resulting in a relatively uniform reduction across the group. Cannibalism was found to be an important population regulating mechanism, accounting for an estimated 50.2% of total hatchling mortality and 70.1% of total mortality in age 11 months and older alligators. Male growth rates in both a palustrine marsh (Lacassine National Wildlife Refuge) and estuarine marsh (Rockefeller Refuge) marsh types were greater than female rates (P $<$ 0.0001). Growth rates and weight-length ratios of alligators in estuarine marsh were greater than those of alligators in palustrine marsh (P $<$ 0.0001). Age specific fecundity and survivorship rates of alligators in the palustrine marsh were less than alligators in the estuarine marsh. The home range size and activity pattern of adult female alligators of different reproductive status were compared among seasons of the year. Home range size (P = 0.54) and minimum average daily movement rates (P = 0.85) did not differ between nesting and non-nesting radio-collared females during the summer nesting season. No difference was found between females with and without broods in the two variables during the fall brooding season. Adult radio-collared female alligators ranged over larger areas and had greater daily average daily movement rates during the spring breeding season than during any other season of the year (P $<$ 0.01). Annual home range size of the 15 adult female alligators monitored during the study was 36.2 $\pm$ 42.6 (SD) ha.

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A Tract Rating System For Harvesting Hardwood Timber In The South Delta Region Of Louisiana., Carlos Orlando Turc Jan 1989

A Tract Rating System For Harvesting Hardwood Timber In The South Delta Region Of Louisiana., Carlos Orlando Turc

LSU Historical Dissertations and Theses

Based on a survey of forest products industries and logging contractors, the factors that affect harvesting costs and stumpage values on hardwood timber tracts in the South Delta Region of Louisiana were identified. Responses were evaluated with a scale value representing the relative importance of each factor. The majority of the respondents felt that physical and stand factors were the most important while contractual and legal factors were the least important. Presence and absence of roads, terrain, accessibility, product class, and timber quality were the top five factors. A second questionnaire containing weights and rankings for 32 selected factors was …

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The Synthesis Of Constrained And Benzannulated Derivatives Of The Essential Amino Acids Tyrosine And Tryptophan., Marco A. Vela Jan 1989

The Synthesis Of Constrained And Benzannulated Derivatives Of The Essential Amino Acids Tyrosine And Tryptophan., Marco A. Vela

LSU Historical Dissertations and Theses

Benzannulated and a series of constrained derivatives of the essential amino acids tyrosine and tryptophan were synthesized. The synthesis of the two benzannulated tyrosine analogs followed traditional synthetic protocols that basically consisted of obtaining key oxazolones and further elaboration to the target amino acids; the latter compounds were obtained as racemic mixtures. All the reaction intermediates were fully characterized spectroscopically, and when possible, structure proof was established by X-ray crystallographic determinations. Asymmetric hydrogenation studies on the intermediate (Z)-2-benzoylaminoacrylic acids were undertaken in an effort to obtain enantiomerically pure materials. The products were, in fact, chiral upon hydrogenation in the presence …

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Model-Based Three-Dimensional Object Recognition And Localization Using Properties Of Surface Curvatures., Wu Wang Jan 1989

Model-Based Three-Dimensional Object Recognition And Localization Using Properties Of Surface Curvatures., Wu Wang

LSU Historical Dissertations and Theses

The ability to recognize three-dimensional (3-D) objects accurately from range images is a fundamental goal of vision in robotics. This facility is important in automated manufacturing environments in industry. In contrast to the extensive work done in computer-aided design and manufacturing (CAD/CAM), the robotic process is primitive and ad hoc. This thesis defines and investigates a fundamental problem in robot vision systems: recognizing and localizing multiple free-form 3-D objects in range images. An effective and efficient approach is developed and implemented as a system Free-form Object Recognition and Localization (FORL). The technique used for surface characterization is surface curvatures derived …

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Genetics And Morphology Associated With The Flowering Pattern, Flowers, And Leaves Of Capsicum Annuum L. And Capsicum Chinense Jacq., Dai-Mei Shuh Jan 1989

Genetics And Morphology Associated With The Flowering Pattern, Flowers, And Leaves Of Capsicum Annuum L. And Capsicum Chinense Jacq., Dai-Mei Shuh

LSU Historical Dissertations and Theses

The leaves and the flowers of Capsicum annuum L. and Capsicum chinense Jacq. were morphologically and genetically studied. C. annuum sets one flower at each node; C. chinense sets multiple (two or three) flowers at each node. 'Serrano Chili' (C. annuum L.) has an unique pubescent leaf type. The study on the interspecific hybridization between 'Serrano Chili' and No. 178 (C. chinense Jacq.) showed a F2 segregation ratio 45:9:10 (multiple flowers: intermediate flowering type: single flower) for the inheritance of multiple flowers. The interspecific hybridization, together with the intraspecific hybridization of 'Serrano Chili' crossed with 'Keystone Resistant Giant No. 4', …

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Plant Growth Regulator Evaluations In Warm Season Turfgrasses., Dennis Wayne Wells Jan 1989

Plant Growth Regulator Evaluations In Warm Season Turfgrasses., Dennis Wayne Wells

LSU Historical Dissertations and Theses

Fourteen experiments, conducted at varying times during an 8-year period from 1981 through 1988, were designed to investigate plant growth regulators (PGRs) for their potential benefits in the production and maintenance of warm season turfgrasses. Turfgrass species evaluated over the eight year period, but not necessarily every year, included: common bermudagrass (Cynodon dactylon L.), bahiagrass (Paspalum notatum Flugge), carpetgrass (Axonopus affinis Chase.), centipedegrass (Eremochloa ophiuroides (Munro) Hack.), St. Augustinegrass (Stenotaphrum secundatum (Walt.) Kuntze), and zoysiagrass (Zoysia japonica Steud.). The chemicals evaluated included: N-2,4-dimethyl-5-(trifluormethyl)-sulfonyl-aminophenylacetamide (mefluidide); a-(1-methylethyl)-a- (4-(trifluoromethoxy)-phenyl) -5-pyrimidenemethanol (flurprimidol); N- ((acetylamino)methyl) -2-chloro-N-(2,6-diethylphenyl)acetamide (amidochlor); N-(phosphonomethyl)glycine (glyphosate); 3-7-dichloro-8-quinoline-carboxylic acid (quinclorac); 2- (1-(ethotymine)-butyl) -5- …

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Age And Growth Of Red Drum, Sciaenops Ocellatus, And Black Drum, Pogonias Cromis, In The Northern Gulf Of Mexico., Daniel William Beckman Jan 1989

Age And Growth Of Red Drum, Sciaenops Ocellatus, And Black Drum, Pogonias Cromis, In The Northern Gulf Of Mexico., Daniel William Beckman

LSU Historical Dissertations and Theses

The objectives of this study were to obtain age estimates and describe growth for the two sciaenid fish species, red drum Sciaenops ocellatus and black drum Pogonias cromis, in the northern Gulf of Mexico. Age estimates were made using annulus counts in transverse sections of otoliths (inner ear bones). Aging techniques were validated for juvenile red drum by imparting oxytetracycline into otoliths as a time marker. Recaptures validated that annuli were deposited in otoliths yearly up to 2.5 years age, with the first annulus formed in the second winter at 1-1.5 years age. Age estimates for remaining age classes of …

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The Effects Of Relaxation And Laughter On The Perceived Intensity And Affect Of Pain Tolerance., Simon Davies Jan 1989

The Effects Of Relaxation And Laughter On The Perceived Intensity And Affect Of Pain Tolerance., Simon Davies

LSU Historical Dissertations and Theses

This study described the effect of relaxation and laughter on the perceived intensity and affect of pain induced by a cold water pressor test. Equal numbers of female athletic and non-athletic subjects (N = 36) were selected from varsity athletes and undergraduates at Louisiana State University. All subjects were pre-tested on their tolerance to a cold water pressor test. Responses on visual analogue scales for perceived pain intensity (I) and affect (A), and submersion time were recorded. The volunteer subjects were randomly assigned to one of three groups: relaxation-inducing, laughter-inducing, or control. Following a 20 minute exposure to the audio …

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In Vitro Screening Of Easter Lily (Lilium Longiflorum Thunb) For Resistance To Stem Rot Caused By Phytophthora Cactorum., Ola Abdel-Aziz Elshennawy Jan 1989

In Vitro Screening Of Easter Lily (Lilium Longiflorum Thunb) For Resistance To Stem Rot Caused By Phytophthora Cactorum., Ola Abdel-Aziz Elshennawy

LSU Historical Dissertations and Theses

Callus cultures were initiated using 0.5 cm bulb scale segments of Easter lily (Lilium longiflorum Thunb) cultured on a medium designated CI-1, which contained (per liter), 4.3 g Murashige and Skoog basal salts, 30 g sucrose, 8 g agar, 0.4 mg Thiamine, 100 mg myo-inositol, 2.5 mg 1-naphthaleneacetic acid (NAA) and 0.1 mg N-(phenyl-methyl)-1-H-purine-6-amine (BA). Calli derived from 3 cultivars of Easter lily, 'Ace', 'Harson' and 'Nellie White', susceptible to the fungus Phytophthora cactorum, were irradiated with UV light (25 erg mm$\sp{-2}$ s$\sp{-1}$) for 0-28 days at 4 day intervals. The calli were then subcultured for 4 weeks on CI-1 …

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The Effect Of Teaching Upon The Biology Content Cognitive Structure Of Teachers., Patricia Lynn Hauslein Jan 1989

The Effect Of Teaching Upon The Biology Content Cognitive Structure Of Teachers., Patricia Lynn Hauslein

LSU Historical Dissertations and Theses

The Instrument for Free Sorting of Biology Concepts was used to assess understanding of the relationships among 37 biology concepts by five groups: (1) Preservice secondary science teachers (PSR) (2) Inservice biology teachers with 1-3 years of teaching experience (NOV). (3) Inservice biology teachers with 5 or more years of experience (EXP). (4) Scientists in any biological science field (e.g., microbiology, botany) (SCI). (5) College seniors majoring in biology (MAJ). Data collected from the F-Sort of Biology concepts were analyzed using Latent Partition Analysis and Alpha Factor Analysis with additional interpretation from multidimensional scaling. The subjects were asked to think …

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Toward An Eschatological Curriculum Theory., George Patrick Slattery Jr Jan 1989

Toward An Eschatological Curriculum Theory., George Patrick Slattery Jr

LSU Historical Dissertations and Theses

This study explores the relationship between eschatology and curriculum theory. Themes such as liberation, emancipatory knowledge, transformative pedagogy, concepts of time, impact of the future on present experience, and learning landscapes are traced in the emerging literature of theology and of curriculum theory. The mutual interest in these themes in both fields of study provides the basis for moving toward an eschatological curriculum theory. The reconceptualization which has occurred in curriculum theory and the new emphasis on eschatology in twentieth century theology both provide a foundation for this curriculum theory rooted in hope. In contemporary theology there is a movement …

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Genotype-By-Environment Interactions, Stability Across Environments, And Tolerance To Low Soil Fertility Of Wheat In Louisiana., Jalaluddin Jan 1989

Genotype-By-Environment Interactions, Stability Across Environments, And Tolerance To Low Soil Fertility Of Wheat In Louisiana., Jalaluddin

LSU Historical Dissertations and Theses

Genotypic stability of performance across environments in general, or across levels of a specific environmental factor in particular, is an important concern of plant breeders. The objectives of this research were to examine the relationships and repeatability of the commonly used stability statistics, the relative merits of these statistics in the stability analyses of wheat (Triticum aestivum L.) yield and test weight, and the relationship of genotypic tolerance to low soil-fertility with yield stability. Yield and test weight data of the Louisiana Agricultural Experiment Station (LAES) winter wheat performance trials from 37 year-location combinations were used in the stability analyses. …

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Ecological Studies Of Velvetbean Caterpillar, Anticarsia Gemmatalis Hubner, Pupae In Louisiana Soybean Fields., Joon-Ho Lee Jan 1989

Ecological Studies Of Velvetbean Caterpillar, Anticarsia Gemmatalis Hubner, Pupae In Louisiana Soybean Fields., Joon-Ho Lee

LSU Historical Dissertations and Theses

The microhabitat distribution of velvetbean caterpillar (VBC), Anticarsia gemmatalis Hubner (Lepidoptera: Noctuidae) was studied in soybean field cages and fields during 1985, 1986 and 1987. Larval density did not affect pupal horizontal distribution patterns related to direction and distance from the plant row. Pupae were found equally on both sides of soybean plant rows in a cage study. Pupae were found on and below the soil surface, but not on the plant. In 51 cm row spacing, both equal number and similar dispersion pattern of pupae were found on either side of the plant row. In 91 cm row spacing, …

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Molecular Genetic And Biochemical Analyses Of A Dna Repair Gene From Serratia Marcescens., Keith Eugene Murphy Jan 1989

Molecular Genetic And Biochemical Analyses Of A Dna Repair Gene From Serratia Marcescens., Keith Eugene Murphy

LSU Historical Dissertations and Theses

In Escherichia coli, the SOS response and two 3-methyladenine DNA glycosylases (TagI and TagII) are required for repair of DNA damaged by alkylating agents such as methyl methanesulfonate (MMS). Mutations of the recA gene eliminate the SOS response. TagI and TagII are encoded by the tag and alkA genes, respectively. A gene (rpr) encoding 3-methyladenine DNA glycosylase activity was isolated from the Gram-negative bacterium Serratia marcescens. The gene, localized to a 1.5-kilobase pair SmaI-HindIII restriction fragment, was cloned into plasmid pUC18. The clone complemented E. coli tag alkA and recA mutations for MMS resistance. The rpr gene did not, however, …

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Effect Of Knowledge On Teachers' Interactive Thinking And Children's Overhand Throwing Performance., Edward Walkwitz Jan 1989

Effect Of Knowledge On Teachers' Interactive Thinking And Children's Overhand Throwing Performance., Edward Walkwitz

LSU Historical Dissertations and Theses

This study examined the effects of knowledge of subject matter (overhand throwing) and of throwing-specific instructional strategies on teacher's interactive thinking. The impact of these two categories of teacher knowledge on lesson objectives, the quality of skill practice, and kindergartners' overhand throwing development over a unit of instruction were also explored. Eight kindergarten classroom teachers who possessed high generic teaching skill competence taught a six-week overhand throwing unit to the children (N = 150) in their intact classes. Prior to the unit, four of the teachers were exposed to a training program that increased their knowledge of overhand throwing. Four …

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The Development Of A Fetal Uterine Cell In Vitro Coculture System For Mammalian Embryos., Klaus Enrique Wiemer Jan 1989

The Development Of A Fetal Uterine Cell In Vitro Coculture System For Mammalian Embryos., Klaus Enrique Wiemer

LSU Historical Dissertations and Theses

In Experiment I, 125 two-pronuclear murine ova were cultured in either Ham's F-10 plus l5% human serum (HF-10h), on a monolayer of human uterine fibroblasts (HUC) or fetal bovine uterine fibroblasts (FBUC). After 96 hours in culture, 2.4% embryos in HF-10h were viable compared with 45.2% and 61% for embryos on HUC and FBUC, respectively. Results suggest that monolayers were advantageous to medium alone for culturing murine embryos. Experiment II was conducted to assess the development of 117 bovine embryos in HF-10 (Treatment A), on a monolayer of FBUC (Treatment B) or hormone-pretreated FBUC (Treatment C). Embryo viability assessed at …

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New Learning And Control Algorithms For Neural Networks., Chung Hwa Youn Jan 1989

New Learning And Control Algorithms For Neural Networks., Chung Hwa Youn

LSU Historical Dissertations and Theses

Neural networks offer distributed processing power, error correcting capability and structural simplicity of the basic computing element. Neural networks have been found to be attractive for applications such as associative memory, robotics, image processing, speech understanding and optimization. Neural networks are self-adaptive systems that try to configure themselves to store new information. This dissertation investigates two approaches to improve performance: better learning and supervisory control. A new learning algorithm called the Correlation Continuous Unlearning (CCU) algorithm is presented. It is based on the idea of removing undesirable information that is encountered during the learning period. The control methods proposed in …

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Phosphorus Sorption Characteristics Of Acid Sulfate Soils Of Thailand., Asdaporn Krairapanond Jan 1989

Phosphorus Sorption Characteristics Of Acid Sulfate Soils Of Thailand., Asdaporn Krairapanond

LSU Historical Dissertations and Theses

The study of P-sorption by soils has practical interest but little is known on the P-sorption characteristics of acid sulfate soils of Thailand, particularly under reduced soil conditions. The effects of pH, redox potential, and various forms of Fe, Al, and Mn on P-sorption of the actual acid sulfate soils (Sulfic Tropaquept) and the para-acid sulfate soil (Typic Tropaquept) were studied in laboratory microcosms. Soil suspensions with a soil to 0.01 M CaCl$\sb2$ solution ratio of 1:7 were incubated under various pH and redox potential conditions. After the incubation period, the soil suspensions were equilibrated with KH$\sb2$PO$\sb4$ ranging from 0 …

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Studies On The Agrobacterium Mediated Transformation Of Potato (Solanum Tuberosum L.) And Tobacco (Nicotiana Tabacum L.) With Antibacterial And High Essential Amino Acids Encoding Genes., Mehmet Selim Cetiner Jan 1989

Studies On The Agrobacterium Mediated Transformation Of Potato (Solanum Tuberosum L.) And Tobacco (Nicotiana Tabacum L.) With Antibacterial And High Essential Amino Acids Encoding Genes., Mehmet Selim Cetiner

LSU Historical Dissertations and Theses

Tuber disks from four cultivars of Solanum tuberosum L. were cultured on a Murashige and Skoog medium supplemented with B5 vitamins, 3.0% sucrose, 0.7% phytagar and ratios of indole-3-actyl-aspartic acid (IAAa) and zeatin riboside (ZR). No shoots were regenerated from Red LaSoda. Russet Burbank, Desiree, and LaBelle tuber disks produced shoots over a range of IAAa and ZR ratios. The greatest number of shoots was regenerated from Russet Burbank at 1 $\mu$M IAAa and 8 $\mu$M ZR. Different potato cultivars were also tested for their responses to Agrobacterium infections. Growth stage of the bacterial cultures and exposure duration of tuber …

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Feeding And Foraging Behaviors Of Subterranean Termites (Isoptera:Rhinotermitidae)., Keith Scott Delaplane Jan 1989

Feeding And Foraging Behaviors Of Subterranean Termites (Isoptera:Rhinotermitidae)., Keith Scott Delaplane

LSU Historical Dissertations and Theses

Six studies were done on feeding and foraging behaviors of three species of subterranean termites, Coptotermes formosanus Shiraki, Reticulitermes flavipes (Kollar), and R. virginicus (Banks) (Isoptera: Rhinotermitidae). When presented with four equal wood blocks, C. formosanus did not forage randomly but concentrated on a few preferred blocks. When R. flavipes and C. formosanus were each placed in foraging arenas with linear, successive wood blocks, C. formosanus consumed a greater percentage dry mass of a wood block before moving to the next block (10.3%) than did R. flavipes (4.2%). Groups of C. formosanus were offered wood blocks that differed in initial …

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Molecular Characterization Of Fall Armyworm Mitochondrial-Dna (Spodoptera Frugiperda (J. E. Smith);)., Li Dao Ke Jan 1989

Molecular Characterization Of Fall Armyworm Mitochondrial-Dna (Spodoptera Frugiperda (J. E. Smith);)., Li Dao Ke

LSU Historical Dissertations and Theses

Chapter I. Mitochondrial DNA (mtDNA) was isolated, purified from pooled samples of fall armyworm (FAW), Spodoptera frugiperda, and characterized. The yield of mtDNA from adults ranged from 45 to 114 ng per moth. Entire mtDNA from adult FAW showed 1 to 3 electrophoretic bands when electrophoresed on agarose gels. When digested with SalI or XhoI restriction endonucleases, all DNA forms co-migrated as single bands with the same mobility. XbaI cleaved the mtDNA into three fragments of 8083 $\pm$ 524, 6179 $\pm$ 430, and 1990 $\pm$ 140 base pairs (bp). The FAW mitochondrial genome size was calculated to be 16,253 $\pm$ …

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Effects Of Genetic Traits On Nonlint Trash And Nep Content Of Cotton, Gossypium Hirsutum L., Ricardo Gabriel Novick Jan 1989

Effects Of Genetic Traits On Nonlint Trash And Nep Content Of Cotton, Gossypium Hirsutum L., Ricardo Gabriel Novick

LSU Historical Dissertations and Theses

Gin induced lint quality problems (neps, short fiber content, seed-coat fragments and reductions in lint turnout) need the consideration of the entire cotton production system. Genetic traits could help reduce seed-cotton trash and/or improve cleanability at the gin. Twelve near-isolines involving four leaf shapes (okra, semi-okra, super-okra and normal), two bract types (frego and normal), two leaf-pubescence levels (semi-smoothness and hairy) and certain trait combinations were grown during 1985, 1986, and 1987 at three locations in Louisiana (Alexandria, Bossier City, and St. Joseph), and harvested with a spindle-picker. Seedcotton samples were ginned on a cut-down version of a commercial gin …

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Influence Of Carriers On Rhizosphere Colonization By Inoculant Bradyrhizobium Japonicum., Marcelle Mary Savoy Jan 1989

Influence Of Carriers On Rhizosphere Colonization By Inoculant Bradyrhizobium Japonicum., Marcelle Mary Savoy

LSU Historical Dissertations and Theses

Organic and inorganic materials are used extensively as carriers in the preparation of commercial soybean inocula. These carriers facilitate application of inocula and promote survival of soybean rhizobia (Bradyrhizobium japonicum) during storage, but little is known of their effects on the ability of inoculant rhizobia to survive after addition to the plant rhizosphere. Laboratory and environmental growth chamber studies were performed to determine the influence of finely milled peat, granular peat, or vermiculite carriers on survival of B. japonicum An-6a (rifampicin- and streptomycin-resistant) in samples of three Louisiana soils. Laboratory studies showed that the numbers of viable cells recovered from …

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Methods Of Parameter Estimation Of Linear Regression Models For Yield Prediction., Man Yong Shin Jan 1989

Methods Of Parameter Estimation Of Linear Regression Models For Yield Prediction., Man Yong Shin

LSU Historical Dissertations and Theses

Different parameter estimation methods of yield prediction models were investigated using data from the Southwide Loblolly Pine Seed Source Study. This project consisted of three distinct studies. Each study dealt with a possible situation in which other parameter estimation methods rather than the ordinary least squares (OLS) estimator might be used. Three different evaluation statistics were computed to select the "best" estimation method for each situation. The objective of the first study was to select the best estimator for a yield model which had multicollinearity among independent variables. Three types of biased estimators were compared with the ordinary least squares …

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