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Articles 12301 - 12330 of 13623

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Feeding And Microspatial Relationships Of Meiobenthic Harpacticoid Copepods With Microbial Flora., Alan William Decho Jan 1987

Feeding And Microspatial Relationships Of Meiobenthic Harpacticoid Copepods With Microbial Flora., Alan William Decho

LSU Historical Dissertations and Theses

Feeding processes and their relationship to microspatial patterns were examined for several harpacticoid species. Field evidences and laboratory radiolabel experiments suggest that diatoms comprise a major portion of the food resources ingested by harpacticoids. Bacteria and mucus-exopolymer secretions (associated with the bacteria and diatoms) are also ingested, coincidently while ingesting diatoms. Also, significant ontogenetic shifts in food resource utilization occur from naupliar to adult stages. Field grazing rate studies were conducted on an intertidal mudflat over different portions of a tidal cycle using several harpacticoid species (Scottolana canadensis, Microarthridion littorale, Paronychocamptus huntsmani). Highest grazing rates for S. canadensis occurred just …

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Physiological Abnormalities Related To Bulimic Behaviors And Physical Symptoms: Toward A Biobehavioral Analysis., Lisa Dee Hinz Jan 1987

Physiological Abnormalities Related To Bulimic Behaviors And Physical Symptoms: Toward A Biobehavioral Analysis., Lisa Dee Hinz

LSU Historical Dissertations and Theses

Bulimia is an eating disorder characterized by secretive binge-eating and abnormal weight-control practices such as self-induced vomiting, and laxative abuse. To date, investigations of physiological abnormalities accompanying bulimia are recent, few in number, and descriptive in nature. Commonly reported physiological abnormalities have included: increased serum bicarbonate, usually in combination with decreased serum chloride; decreased serum potassium; and decreased hematocrit. Two correlations have provided preliminary evidence that bulimic behaviors are associated with physiological abnormalities. The present investigation attempted to describe more fully the relationships among bulimic behaviors, physiological abnormalities, and physical symptoms. Three separate models, representing different physiological systems: (1) potassium; …

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The Production, Culture And Cryopreservation Of Bovine Demi-Embryos., Rickey Wayne Rorie Jan 1987

The Production, Culture And Cryopreservation Of Bovine Demi-Embryos., Rickey Wayne Rorie

LSU Historical Dissertations and Theses

The objective of experiment (Exp) I was to develop and evaluate a simplified method for producing bovine demi-embryos (DE). Treatment (Trt) A and B were the bisection zona pellucida intact (ZI) and free (ZF) embryos, respectively, using a microscope slide micromanipulator. In Trt C and D, ZI and ZF embryos, respectively, were bisected with a hand-held razor blade method. More DE were produced by the razor blade method (Trt C and D) than by the microscope slide micromanipulator method (Trt A and B). More DE were produced from ZF embryos (Trt B and D) than from ZI embryos (Trt A …

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Salinity Effects On The Development And Larval Tolerance Of Five Species Of Echinoderms., Richard Allen Roller Jan 1987

Salinity Effects On The Development And Larval Tolerance Of Five Species Of Echinoderms., Richard Allen Roller

LSU Historical Dissertations and Theses

Salinity effects on the developmental rates, larval tolerances and various metabolic processes of five species of echinoderms were investigated. Development of Lytechinus variegatus (Lamarck), Strongylocentrotus droebachiensis (O. F. Muller, 1776), Strongylocentrotus purpuratus (Stimpson, 1857), Strongylocentrotus pallidus (G. O. Sars, 1871), and Pisaster ochraceus (Brandt, 1835) larvae were observed. Developmental rates and larval survival to metamorphosis of S. droebachiensis and S. pallidus varied directly with salinity and were well within the observed salinity tolerance and distributional limits for the adults. For each species, embryos and larvae at lower salinities (20, 22.5, and $25\sp{o}\!/\!\sb{oo})$ tended to develop more slowly than those at …

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Regulation Of Dextransucrase Secretion By Proton Motive Force In Leuconostoc Mesenteroides., David Roland Otts Jan 1987

Regulation Of Dextransucrase Secretion By Proton Motive Force In Leuconostoc Mesenteroides., David Roland Otts

LSU Historical Dissertations and Theses

The relationship between proton motive force and the secretion of the enzyme dextransucrase (E.C. 2.4.1.5) in Leuconostoc mesenteroides was investigated. The transmembrane pH gradient was determined by measurement of the uptake of radiolabeled benzoate or methylamine while the membrane potential was determined by measurement of the uptake of radiolabeled tetraphenylphosphonium bromide. Leuconostoc mesenteroides was able to maintain a constant proton motive force of $-130$ mV when grown in fermenters at constant pH while a value of $-140$ mV was determined from concentrated cell suspensions. The contribution of the membrane potential and transmembrane pH gradient to the proton motive force varied …

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Physiological Aspects Of Bovine Mammary Involution: A Biochemical And Morphological Investigation., Lorraine Marie Sordillo Jan 1987

Physiological Aspects Of Bovine Mammary Involution: A Biochemical And Morphological Investigation., Lorraine Marie Sordillo

LSU Historical Dissertations and Theses

Quarter milk secretion samples and blood serum for compositional analysis were collected weekly from 29 cows beginning at drying off and continuing until 2 weeks postpartum. Quarter biopsies were taken from 5 additional animals at weekly intervals beginning at drying off through parturition. Histological and cytological parameters of tissues were correlated with biochemical characteristics of secretions. Increased tight junction permeability and decreased synthetic ability of secretory epithelium became evident by changes in mammary secretion composition and tissue morphology during the first 2 weeks of involution. Somatic cell counts, serum albumin, lactoferrin, immunoglobulin G, pH, total protein, and serum concentrations of …

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Estimation Of Direct And Maternal Additive And Heterotic Genetic Effects For Preweaning Traits In Beef Cattle., Chi Lawrence Tawah Jan 1987

Estimation Of Direct And Maternal Additive And Heterotic Genetic Effects For Preweaning Traits In Beef Cattle., Chi Lawrence Tawah

LSU Historical Dissertations and Theses

Progency records from 4 generations of a rotational crossbreeding experiment were fitted to a regression equation to obtain estimates of direct and maternal additive (Ig, Mg) and heterotic (Ih, Mh) genetic effects of preweaning traits for Angus (A), Brahman (B), Charolais (C), Hereford (H) breeds and their combinations. These estimates were fitted to prediction equations to compare preweaning performance of breed groups under different mating systems. Heterosis estimates were used to compute expected heterosis for each rotational cross. The C had the largest Ig estimate for BWT (5.2 kg), ADG (.074 kg/d) and WWT (22.1 kg) while H had the …

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The Relationship Between Supervisory Methods And Teacher Self-Concept As A Teacher And As A Person., Annis Dowden Tarver Jan 1987

The Relationship Between Supervisory Methods And Teacher Self-Concept As A Teacher And As A Person., Annis Dowden Tarver

LSU Historical Dissertations and Theses

This study was designed to test the relationship between methods of supervision used during the supervisory conference and teacher self-concept as a teacher and as a person. The method of supervision, the independent variable in the research design, was either clinical supervision using the Hunter (1980) method or traditional supervision. The clinical method of supervision used specific, diagnostic, and prescriptive feedback given by the supervisor during a series of supervisory conferences that followed the five types of supervisory conferences proposed by Hunter. The traditional method of supervision used general and non-specific feedback given by the supervisor during a series of …

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Influences Of Different Processing Technologies On The Properties Of Emulsion-Type Sausages., Yun-Chu Wu Jan 1987

Influences Of Different Processing Technologies On The Properties Of Emulsion-Type Sausages., Yun-Chu Wu

LSU Historical Dissertations and Theses

Emulsion-type sausages were manufactured for evaluation of microstructure, smokehouse yield, and textural characteristics with different lean sources, salt levels, casing sizes and endpoint cooking temperatures. Emulsion stability and water binding capacity of raw batters manufactured with 1, 2 or 3% salt were examined at chopping temperatures of 10, 15.5 and 21$\sp\circ$C. Frankfurters, manufactured with three sources of pork fat, were examined during a nine week storage for oxidative rancidity under different packaging conditions. Bologna from forage-finished beef had lower water, fat and total losses and a higher smokehouse yield than bologna from grain-fed beef at 1 and 2% salt levels. …

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The Management Of Dying: Tasks And Social Relationships In Patient Care., Jeffrey Michael Clair Jan 1987

The Management Of Dying: Tasks And Social Relationships In Patient Care., Jeffrey Michael Clair

LSU Historical Dissertations and Theses

A grounded theory approach guides the interpretation of observational, semi-structured interviews, content analysis, and taped discourse data collected from a 48 bed oncology unit with 288 study patients. Data are presented to explicate generated concepts of regressive intervention and the dying role. Data indicate that when physicians no longer perceive their goals of cure achievable, they distance themselves from patients. Physicians use certain devices to facilitate this gradual or abrupt, but purposeful, withdrawal from patients' curative regimens. These devices are specified in discourse transcripts as use of the medical record, silence, and alternative interactions (family members). Physician-authority, cautious optimistic conversational …

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Development Of A Soft-Tissue Infection Model In The Cow., Cyril Roy Clarke Jan 1987

Development Of A Soft-Tissue Infection Model In The Cow., Cyril Roy Clarke

LSU Historical Dissertations and Theses

The ultimate goals of this study were to develop and define a subcutaneous tissue chamber as a suitable device for establishing a Pasteurella haemolytica soft-tissue infection model in cattle and to use this model to study the in vivo efficacy and distribution of a potentiated sulfa antimicrobial. Developmental studies resulted in the selection of a suitable tissue chamber design that maximized the chamber penetration of an intravenously administered lipid-soluble drug. This chamber could be sampled with ease and contained enough chamber fluid to allow repetitive sampling. Cytological and chemical investigation revealed that the composition of fluid within chambers approached the …

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A Supply Response Model For Rice And Soybeans In The Mississippi Delta., David Leon Hoppenstedt Jan 1987

A Supply Response Model For Rice And Soybeans In The Mississippi Delta., David Leon Hoppenstedt

LSU Historical Dissertations and Theses

This study examines the economic sources of variation in the supply of rice and soybeans in the Mississippi Delta. As farmers alter their land allocations to various crops, they cause fluctuations in the supply of agricultural products. Traditional theory posits that acreage planted is a function of lagged prices, but does not explicitly recognize some technological constraints. One prevalent technological constraint is that the monocropping of particular crops results in a significant decrease in land productivity. The model in this study attempts to improve the specification of the technological constraint of declining soil productivity due to monocropping. Two different statistical …

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Ultrastructural And Molecular Studies Of The Fungus {\It Mucor\/}: The Mitochondrion And The Recombinant-Rna Genome., Geun Eog Ji Jan 1987

Ultrastructural And Molecular Studies Of The Fungus {\It Mucor\/}: The Mitochondrion And The Recombinant-Rna Genome., Geun Eog Ji

LSU Historical Dissertations and Theses

Mitochondria from aerobic hyphae of Mucor racemosus displayed a relatively elongated morphology with well developed cristae and stained in positive contrast. Mitochondria from anaerobic yeast cells were more circular in form, displayed less distinct but well recognizable cristae, and stained in negative contrast. Tween 80, ergosterol or cerulenin did not alter mitochondrial morphology when added to cultures. Mitochondria from cells grown in the presence of chloramphenicol displayed a morphology intermediate between those of yeast and hyphae and stained in negative contrast. Mitochondria were isolated by isopycnic centrifugation in Percoll. A single band in hyphal preparations displayed cyanide-sensitive respiration and was …

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Studies On The Protein Changes In Skeletal Muscles Of Gulf Coast Finfish Species Associated With Frozen Storage, Formaldehyde Addition And Freeze-Thawing Cycles., Myrna O. Nisperos-Carriedo Jan 1987

Studies On The Protein Changes In Skeletal Muscles Of Gulf Coast Finfish Species Associated With Frozen Storage, Formaldehyde Addition And Freeze-Thawing Cycles., Myrna O. Nisperos-Carriedo

LSU Historical Dissertations and Theses

The effects of frozen storage, formaldehyde addition and freeze-thawing cycles were determined using three finfish species from the Gulf of Mexico, spotted seatrout (Cynoscion nebulosus), black drum (Pogonias cromis) and mullet (Mugil cephalus). Frozen storage of spotted seatrout fillets at $-20\sp\circ$C for 6 weeks led to reductions in pH, water-binding capacity and solubility of salt-extractable proteins. SDS-Polyacrylamide gel electrophoretic examination of the salt-extractable proteins showed that as time of storage increased, aggregation of high-molecular weight components occurred. The addition of 300 ppm formaldehyde prior to frozen storage did not produce significant changes. However, muscles containing 500 ppm formaldehyde showed decreases …

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Marital Relationships And Conflict Resolution Skills Of Bulimics., Dorothy Jo Van Buren Jan 1987

Marital Relationships And Conflict Resolution Skills Of Bulimics., Dorothy Jo Van Buren

LSU Historical Dissertations and Theses

Bulimia is an eating disorder characterized by episodic binge eating and other related symptomatology. Previous research suggests that bulimics experience interpersonal problems particularly in the areas of conflict resolution and in their satisfaction with their roles within their families and marriages. The present study compared 12 bulimic couples to 14 maritally distressed couples and 15 normal control couples on measures of relationship satisfaction, conflict resolution styles, and beliefs about intimate relationships. In addition, couples' communication styles were analyzed based on their participation in an analogue conflict situation. Results of this study provided support for the contention that bulimics experience dissatisfaction …

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Characterization Of Equine Infectious Anemia Virus Variants Generated In Vivo And In Vitro And A Rapid Assay For Virus-Specific Antibody., Paul Murumba Rwambo Jan 1987

Characterization Of Equine Infectious Anemia Virus Variants Generated In Vivo And In Vitro And A Rapid Assay For Virus-Specific Antibody., Paul Murumba Rwambo

LSU Historical Dissertations and Theses

Three Shetland ponies (A, B and C) were inoculated with plasma from a pony with clinical signs of equine infectious anemia (EIA) and observed for 165 to 440 days. Clinical signs of EIA marked by high fever (39.5$\sp\circ$C) lasting 2-4 days were observed 2-3 weeks after infection and one to four such episodes occurred in each pony. EIAV was reisolated from plasma by end-point dilution in fetal equine kidney (FEK) cells and a plasma viremia 10$\sp{3.5}$ TCID$\sb{50}$/ml was observed during each episode. A total of seven virus isolates were recovered. Cross-neutralization tests with sequential serum samples showed that four viruses …

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Interactions Of Weed, Nematode, And Arthropod Management Strategies With The Louisiana Sugarcane Agroecosystem: A Holistic Perspective., Allan Thomas Showler Jan 1987

Interactions Of Weed, Nematode, And Arthropod Management Strategies With The Louisiana Sugarcane Agroecosystem: A Holistic Perspective., Allan Thomas Showler

LSU Historical Dissertations and Theses

Interactions among Louisiana sugarcane (Saccharum hybrids), weeds, nematodes, sugarcane mosaic virus (SCMV), and pest, prey, and predatory arthropods were mediated through tropic, host plant biochemical, and intra- and interspecific competitive relationships. Weed competition reduced crop biomass (15%, P $\le$ 0.005), and sugar yield (13%, P $\le$ 0.05). Weeds, however, were associated with more predatory arthropods, including Solenopsis invicta Buren, on the soil, weeds, and sugarcane plants, and with reduced Diatraea saccharalis (F.) injury (over 25%, P $\le$ 0.05). Without chemical D. saccharalis control, sugarcane production in weedy habitats was economically superior to that in weed-free habitats. Aldicarb, a nematicide-insecticide, diminished …

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Geographic Variation In Morphology And Allozymes Within Tree Squirrels, Sciurus Niger And S. Carolinensis, Of The Lower Mississippi River Valley., Nancy D. Moncrief Jan 1987

Geographic Variation In Morphology And Allozymes Within Tree Squirrels, Sciurus Niger And S. Carolinensis, Of The Lower Mississippi River Valley., Nancy D. Moncrief

LSU Historical Dissertations and Theses

Geographic variation was studied in fox squirrels, Sciurus niger, and gray squirrels, S. carolinensis, by comparing patterns of differentiation within and between these two sympatric species. Patterns of variation were examined in light of the lower Mississippi River as a potential barrier to dispersal and gene flow in these squirrels. Differences within and between species were analyzed using morphologic (15 cranial and mandibular measurements) and allozymic (35 presumptive gene loci) characters. Geographic patterns of variation among populations were apparent in the morphology and allozymes of both species; patterns of differentiation in morphologic and allozymic characters are similar between species; however, …

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Malaysian Prawn (Macrobrachium Rosenbergii) Production Studies In Polyculture Schemes With Channel Catfish (Ictalurus Punctatus)., Mark Steven Lamon Jan 1987

Malaysian Prawn (Macrobrachium Rosenbergii) Production Studies In Polyculture Schemes With Channel Catfish (Ictalurus Punctatus)., Mark Steven Lamon

LSU Historical Dissertations and Theses

Three Malaysian prawn (Macrobrachium rosenbergii)/channel catfish (Ictalurus punctatus) polyculture studies were conducted from May 1984 through October 1986. In the first study prawn stocking size and density on catfish and prawn production were examined. In 1984 catfish, x = 24 g, were stocked at 9,884/ha. Prawns, x = 0.04 g, were stocked at 4,942, 9,884 and 14,826/ha. After 144 days catfish average weights, survival and yields were $<$340 g, $<$78% and $<$2,000 kg/ha, respectively. Prawn weight, survival and yields ranged from 34-54 g, 47-61% and 165-344 kg/ha, respectively. In 1985 catfish, x = 33 g, were stocked at 7,410/ha and prawns, x = 0.15 and 0.70 g, were stocked at 1984 densities. After 137 days catfish average weight, survival and yields were 427 g, 86% and 2,726 kg/ha, respectively. Prawn weight, survival and yields ranged from 48-73 g, 41-88% and 110-471 kg/ha, respectively. Positive economic net returns were achieved with 0.15 g prawns stocked at 14,826/ha and 0.70 g prawns stocked at 9,884 or 14,826/ha. In a second study prawn bottom location preference and movement were determined in ponds. Males were more frequently observed in the deep ends of ponds and near the ponds' perimeters, and females were observed more frequently in the shallow ends and in the middles of ponds. Prawn movement did not differ between day and night, averaging 1.1 m/hr. Two-funnel crawfish traps and box traps with slit entrances, 12 and 24 hr set times, and white light and commercial crawfish bait attractants were evaluated for capturing prawns. Traps were not effective at capturing prawns regardless of set time or attractant. In the third study catfish and prawn mean lengths and weights from cast-netted and seined samples were compared to a complete population census taken after 48, 92 and 139 days of growth. Ponds were stocked with catfish at 7,410/ha and prawns at 1984 study levels. Cast-netted samples under-estimated and seined samples over-estimated catfish size. Cast-netted and seined sample prawn means did not differ from each other or population parameters. Catfish and prawn size variation increased over time. Catfish and prawn survival decreased during the first 48 days and then remained constant throughout the rest of the grow-out period.

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Lsu General Catalog 1987-1988, Louisiana State University And Agricultural And Mechanical College Jan 1987

Lsu General Catalog 1987-1988, 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.

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An Assessment Of Africanized Honey Bees (Apis Mellifera L.) As Crop Pollinators., Robert George Danka Jan 1987

An Assessment Of Africanized Honey Bees (Apis Mellifera L.) As Crop Pollinators., Robert George Danka

LSU Historical Dissertations and Theses

Neotropical Africanized honey bees are predicted to replace European bees and become the primary agricultural pollinators in the southern and coastal regions of the United States. This research used direct comparative studies to assess foraging activities and beekeeping-management responses which are expected to govern the performance of Africanized bees as crop pollinators. European colonies fielded on average $3\times$ as many foragers as did Africanized colonies and had percentages of colony members foraging that were nearly $3\times$ as high. European colonies also had much greater variability in foraging activity (ranges: 42-1679 foragers for European bees; 119-352 foragers for Africanized bees); European …

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Rice Stink Bug, Oebalus Pugnax (F.), On Rice: Evaluation For Plant Resistance, Interaction Of Field Fungi With Feeding Damage, And Evaluation Of Insecticides For Control., Marieanne Eva Hollay Jan 1987

Rice Stink Bug, Oebalus Pugnax (F.), On Rice: Evaluation For Plant Resistance, Interaction Of Field Fungi With Feeding Damage, And Evaluation Of Insecticides For Control., Marieanne Eva Hollay

LSU Historical Dissertations and Theses

Feeding punctures of the rice stink bug (RSB), Oebalus pugnax (F.), provide fungi entry sites into rice, Oryza sativa (L.), grains and kernels (hulled grains). Feeding sheaths also serve as a source of nutrients for fungi. Grain spotting fungi did not affect the percentage of spotted kernels (pecky rice) and significantly reduced full grain weight only at low infestation rates of one and two RSB per panicle. Panicles had been treated with a single application of propriconazol (1000 ppm) soon after flowering and later infested in the early milk stage with RSB adult pairs for 9 days. Propriconazol was not …

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Spectroscopic Studies Of Cobalt(Ii) Thiolates And Cobalt(Ii) - Substituted Metallothioneins., Barbara Ann Dixon Jan 1987

Spectroscopic Studies Of Cobalt(Ii) Thiolates And Cobalt(Ii) - Substituted Metallothioneins., Barbara Ann Dixon

LSU Historical Dissertations and Theses

Metallothioneins (MT) are widely occurring proteins characterized by low molecular weights and extremely high metal and sulfur content. Mammalian forms usually contain seven diamagnetic metal ions such as Zn(II) and/or Cd(II) and 20 cysteine residues. An understanding of the physiological role(s) of MT requires the elucidation of the nature and type of metal clusters, and the mechanism of assembly in MT. The stepwise incorporation of Co(II) ions into apo-metallothionein-2 from rabbit liver has been monitored by UV-visible absorption, low temperature magnetic circular dichroism (MCD), and EPR spectroscopies. Interpretation of the results has been facilitated by parallel spectroscopic studies of synthetic …

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Bionomics Of The Sugarcane Borer, Diatraea Saccharalis (F.), In Sweet Sorghum, Sorghum Bicolor (L.) Moench., Billy Wayne Fuller Jan 1987

Bionomics Of The Sugarcane Borer, Diatraea Saccharalis (F.), In Sweet Sorghum, Sorghum Bicolor (L.) Moench., Billy Wayne Fuller

LSU Historical Dissertations and Theses

Economic impact studies revealed that the sugarcane borer, Diatraea saccharalis (F.), reduced sweet sorghum yield of total sugars up to 46% in artificially infested field trials. A significant relationship was found between D. saccharalis damage and yield loss that indicated an economic injury level of 10% bored internodes. Stalk weight, percent sucrose, and total sugars were negatively correlated to D. saccharalis damage; and increased fiber content was positively correlated to percent bored internodes. Information from damage levels, along with survival records, indicated that the economic threshold was reached when approximately 5% of the sweet sorghum plants contained small D. saccharalis …

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Nitrone Spin Traps For Biological Studies. (Volumes I And Ii)., William Reeves Huie Jan 1987

Nitrone Spin Traps For Biological Studies. (Volumes I And Ii)., William Reeves Huie

LSU Historical Dissertations and Theses

A variety of aldonitrones for spin-trapping investigations have been synthesized, purified, and characterized. The alicyclic 5-member ring nitrones 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) and 3,3,5,5-tetramethyl-1-pyrroline-N-oxide (TMPO) and its long-chain derivatives were prepared in 3 or 4 steps. The reaction steps involved a Michael addition to yield the $\gamma$-nitrocarbonyl compound, subsequent mild reduction with zinc and aqueous ammonium chloride to yield the cyclic intermediate nitrone, a Grignard addition reaction to give the hydroxylamine, and finally copper-catalyzed aerial oxidation of the hydroxylamine to provide the aldonitrone. Poor overall yields were obtained. In contrast, the acyclic aromatic nitrone $\alpha$-phenyl-N-tert-butyl nitrone (PBN) and its derivatives were prepared …

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Estimation Of Heritabilities, Genetic Correlations, And Response To Selection For Growth, Body Size, And Processing Traits In Red Swamp Crawfish, Procambarus Clarkii (Girard)., Charles Gregory Lutz Jan 1987

Estimation Of Heritabilities, Genetic Correlations, And Response To Selection For Growth, Body Size, And Processing Traits In Red Swamp Crawfish, Procambarus Clarkii (Girard)., Charles Gregory Lutz

LSU Historical Dissertations and Theses

Potential for genetic improvement of red swamp crawfish, Procambarus clarkii, and the possibility of negative selection for growth in cultured stocks as a result of harvesting practices have recently been the subject of speculation. This study provided indications of the potential for improvement of growth and processing traits in P. clarkii through selection. After 150 days growout in fiberglass pools planted with rice (Oryza sativa), P. clarkii from each of 39 full-sib families nested within 15 half-sib families were weighed and measured for total length, carapace length, carapace width, abdomen width, abdomen depth, chela length, chela width, abdomen meat weight, …

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Conformational Studies Of Carnitine And Acetylcarnitine: Design And Synthesis Of Active-Site Probes Of Carnitine Acetyltransferase., William Jay Colucci Jan 1987

Conformational Studies Of Carnitine And Acetylcarnitine: Design And Synthesis Of Active-Site Probes Of Carnitine Acetyltransferase., William Jay Colucci

LSU Historical Dissertations and Theses

The conformations of carnitine (Cn) and acetylcarnitine (AcCn) have been investigated through a combination of methods. The solid-state structures of their zwitter-ionic forms have been determined by single-crystal X-ray analyses. The crystal structures reveal different backbone conformations for the two molecules. Carnitine exists in an extended conformation (a,g $\sp-$ conformations for the C1-C2-C3-C4 and N1-C4-C3-O3 torsion angles, respectively), while AcCn exhibits a folded conformation ($g\sp-,g\sp-$). The solution conformations of Cn and AcCn have been investigated by high resolution $\sp1$H NMR coupling data. A simple equation has been developed for the prediction of torsion angles from $\sp3 J$ (HCCH) coupling constants. …

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Consumption, Utilization, Biology, And Economic Injury Levels Of Fall Armyworm, Spodoptera Frugiperda (J. E. Smith), On Selected Bermudagrasses., Tasanee Jamjanya Jan 1987

Consumption, Utilization, Biology, And Economic Injury Levels Of Fall Armyworm, Spodoptera Frugiperda (J. E. Smith), On Selected Bermudagrasses., Tasanee Jamjanya

LSU Historical Dissertations and Theses

The effects of nine bermudagrass, Cynodon dactylon (L.) Pers., varieties and strains on the development, survivorship, consumption and utilization, preference, and host suitability of the fall armyworm (FAW), Spodoptera frugiperda (J. E. Smith) were determined. The bermudagrasses tested were 'Coastal', 'Tifton 44', 'Tifton 78', 'Tifton 292', 'Grazer', #1 R12P5, 'OSU 71 X 6-7','OSU 74 X 11-2', and 'OSU 74 X 12-1'. 'Tifton 292' was the most preferred grass by neonate larvae, while 'OSU 74 X 11-2' was the least preferred grass. 'Tifton 78' was the most susceptible host, while 'OSU 71 X 6-7' was the least suitable host to FAW …

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A Seasonal And Ontogenetic Examination Of The Reproductive Biology Of Pseudoplusia Includens (Walker)., Linda Jean Mason Jan 1987

A Seasonal And Ontogenetic Examination Of The Reproductive Biology Of Pseudoplusia Includens (Walker)., Linda Jean Mason

LSU Historical Dissertations and Theses

Laboratory observations on the mating behavior of soybean loopers, Pseudoplusia includens (Walker), indicated a calling pattern that was highly variable both within individual females over time and among individuals. However, some trends were apparent. The onset of calling showed temporal advancement over the first three nights of calling after adult emergence; the duration of calling showed a temporal advancement during the first six nights, while the termination of calling receded over the same period then reversed its trend. The majority of females initiated calling three nights following emergence while maximum percent calling was observed around five hours after the onset …

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Applications Of Silicon Compounds In The Synthesis Of Insect Pheromone Analogs., Oanh Thi Vu Nguyen Jan 1987

Applications Of Silicon Compounds In The Synthesis Of Insect Pheromone Analogs., Oanh Thi Vu Nguyen

LSU Historical Dissertations and Theses

Pheromones are highly active chemical messengers which are secreted by a member of an animal species and elicit a definite behavior in other members of the same species. The study of insect pheromones has recently attracted great attention because of their purely scientific interest and their favorable prospects for the control of pest insects. The study in this dissertation aims at the elucidation of some important aspects of the mechanism of perception of insect pheromones, which is based on the fact that the cyclic analogs of the natural pheromone have partially fixed conformations, whereas the straight-chain natural pheromone is more …

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