Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Louisiana State University

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 7981 - 8010 of 9751

Full-Text Articles in Entire DC Network

Synthetic Peptide Analyses Of The Surface Glycoproteins Of Equine Infectious Anemia Virus., Judith Marchand Ball Jan 1990

Synthetic Peptide Analyses Of The Surface Glycoproteins Of Equine Infectious Anemia Virus., Judith Marchand Ball

LSU Historical Dissertations and Theses

Previous investigations have characterized both the genomic and antigenic variations in equine infectious anemia virus (EIAV) surface glycoproteins that arise during replication of the virus. DNA sequence analyses have defined regions of conserved and variable sequences localized in the EIAV envelope glycoproteins. These studies indicate that EIAV persistence and periodicity of clinical disease result from the relatively rapid evolution of antigenic variants which allows the virus to temporarily circumvent the host immune response. The primary objective of this work is the complete characterization of the immunogenic components of the EIAV env-encoded surface unit (SU) and transmembrane (TM) glycoproteins. These surface …

Go to article

Regulation Of Cortisol And Prolactin In Horses., Donald R. Colborn Jan 1990

Regulation Of Cortisol And Prolactin In Horses., Donald R. Colborn

LSU Historical Dissertations and Theses

In Experiment I, stallion exposure to an estrous mare on d 2 caused cortisol and PRL concentrations to increase (P $$.05) on d 1, 3, 4, 5 or 6 when no exposure occurred. In Experiment II, cortisol concentrations increased (P $<$.05) within 10 min after sexual stimulation (SS), physical exercise (PE), restraint via a twitch (RT) and epinephrine administration (EA) but not during control bleedings. PRL concentrations increased (P $<$.05) following SS, PE and RT but not after EA or during control bleedings. In Experiment III, cortisol concentrations in geldings increased (P $<$.05) following EA, PE and RT but not following SS or control bleedings. PRL concentrations increased (P $<$.05) following PE and SS. In Experiment IV, sulpiride injection was used in stallions in an attempt to increase PRL concentrations. Prior to sulpiride treatment, concentrations of both cortisol and PRL increased (P $<$.05) by 40 to 80% in response to exercise; concentrations of LH and FSH also increased (P $<$.05) by approximately 10%. Sulpiride treatment stimulated (P $<$.05) daily PRL secretion by approximately 5-fold, and caused a decrease (P $<$.05) in daily FSH secretion whereas only isolated differences (P $<$.05) occurred between treatment groups for daily LH and cortisol secretion. At the end of treatment, there was no PRL response to exercise for stallions treated with sulpiride, but there was (P $<$.05) for control stallions; only control stallions exhibited a marginal cortisol response (P $<$.05) to exercise. The PRL response to TRH was increased (P $<$.05) 4-fold in stallions treated with sulpiride but was unchanged in control stallions. Sulpiride treatment did not affect (P $>$.05) the LH or FSH response to exogenous GnRH. We conclude that: (1) returning stallions to the site of a previous period of sexual excitement does not cause a memory-mediated rise in cortisol or prolactin; (2) cortisol and PRL are secreted rapidly in response to some but not all forms of physical and chemical stress in stallions and geldings; …

Go to article

The Effect Of Olivocochlear Bundle Transection On Cochlear Mechanics., Thomas Allen Littman Jan 1990

The Effect Of Olivocochlear Bundle Transection On Cochlear Mechanics., Thomas Allen Littman

LSU Historical Dissertations and Theses

A growing body of research suggests that the efferent innervation to the cochlea, the olivocochlear bundle, plays a role in modulating the mechanical function of the cochlea. Some of the more provocative findings supporting an hypothesis of OCB modulation have come from studies which assessed efferent influences on tuning curves and acoustic distortion products, two measures thought to be sensitive indicators of cochlear mechanical function. While the OCB appears to be capable of modifying cochlear mechanics, the functional role attributed to the efferents has been difficult to define. For example, some studies which have transected all or part of the …

Go to article

An Annotated Compendium Of Selected Vocal Solo Literature For Protestant Churches, 1958-1988., David Alan Luther Jan 1990

An Annotated Compendium Of Selected Vocal Solo Literature For Protestant Churches, 1958-1988., David Alan Luther

LSU Historical Dissertations and Theses

The topic of this study is the sacred art song of the past three decades (1958-1988). One-hundred forty-eight songs have been selected for the Compendium which, in the writer's opinion, are suitable in both quality and appropriateness for the Protestant worship service. The listing does not include solo literature which would be classified as "gospel" or "Christian Contemporary," nor does it include selections which may be more fitting for recital use. Each entry gives the title, composer, author of text, publisher, date, range, tessitura, occasion, and type of accompaniment. In the annotation which follows, notable musical and textual features are …

Go to article

Factors Affecting Conceptus Loss In Cattle., Daniel Patrick Ryan Jan 1990

Factors Affecting Conceptus Loss In Cattle., Daniel Patrick Ryan

LSU Historical Dissertations and Theses

In the first experiment, the temperature humidity index (THI) was compared with pregnancy rates (PR) in bovine females under two different environmental cooling systems. The PR decreased if the THI was greater on the second day prior to or after mating compared with that of the day of mating. In the second experiment, the stages of embryo mortality in the first 40 days of gestation were identified in the hot and cool seasons of the year. At day 13 or 14 of pregnancy 27% of embryos were viable in the hot months, which was less than 60% at day 13 …

Go to article

Identification Of Vibrio Anguillarum And Vibrio Ordalii By A Monoclonal Antibody Coagglutination Assay., Zhongshi Wang Jan 1990

Identification Of Vibrio Anguillarum And Vibrio Ordalii By A Monoclonal Antibody Coagglutination Assay., Zhongshi Wang

LSU Historical Dissertations and Theses

Vibrio anguillarum exhibits species-specific antigens on the protein core of the polar flagellum (H) and H-determinants which are expressed by heterologous Vibrio species. Monoclonal antibody (MAb) which reacted with flagella core protein by ELISA were affinity purified from protein A-sepharose. Staphylococcus aureus Cowan 1 cells armed with anti-H MAb coagglutinated each of the 10 V. anguillarum O-antigen serovars within 1 to 2 minutes, as well as V. ordalii isolates. These findings suggest these two vibrios express similar if not identical species-specific H-determinants. The anti-H reagent did not coagglutinate 20 heterologous Vibrio species. MAb generated against LPS, extracted from V. anguillarum …

Go to article

Molecular Cloning And Characterization Of The Rhodobacter Capsulatushema Gene., Maureen Smith Wright Jan 1990

Molecular Cloning And Characterization Of The Rhodobacter Capsulatushema Gene., Maureen Smith Wright

LSU Historical Dissertations and Theses

The first step in the common tetrapyrrole pathway in Rhodobacter capsulatus is the condensation of glycine with succinyl CoA to form 5-aminolevulinate which is then used in the synthesis of bacteriochlorophyll, heme, vitamin B-12, and siroheme. To isolate mutants unable to form 5-aminolevulinate, as a first step in studying regulation of the tetrapyrrole pathway, R. capsulatus was mated with E. coli carrying plasmid pSUP2021. pSUP2021 carries transposon Tn5 and is incapable of replicating in R. capsulatus making it an ideal vector for transposon mutagenesis. One colony was found which requires 5-aminolevulinate for growth. This mutant strain, designated AJB529, has a …

Go to article

Brugia Pahangi: Effects Of Maternal Filariasis On The Responses Of Their Progeny To Homologous Infection., Stephen Carl Bosshardt Jan 1990

Brugia Pahangi: Effects Of Maternal Filariasis On The Responses Of Their Progeny To Homologous Infection., Stephen Carl Bosshardt

LSU Historical Dissertations and Theses

The effects of in utero and neonatal exposure to maternal Brugia pahangi infections on the development of homologous infections, immune responses, and pathologic lesions was studied in age-matched progeny of infected and uninfected female jirds. High IgG antibody titers to B. pahangi antigens were present in the sera of progeny from infected mothers. These neonatal titers to homologous antigens were shown to be of maternal origin, and did not alter the cellular responses of uninfected progeny as measured by in vitro antigen-stimulated blastogenesis and in vivo pulmonary granulomatous inflammatory responses to antigen-coated beads. Studies were conducted to measure age-related differences …

Go to article

Functionality And Binding Of Washed Mechanically Separated Beef In Restructured Meats., Kyung Chul Koh Jan 1990

Functionality And Binding Of Washed Mechanically Separated Beef In Restructured Meats., Kyung Chul Koh

LSU Historical Dissertations and Theses

Binding and texture are important attributes of restructured meats which are dependent upon protein properties. Meat was pre-salted with 0, 2.25, 4.5, 6.75, or 9.0% sodium chloride (NaCl) and extracted with buffers (pH 6.0) containing 0, 0.6, 1.2, 1.8, or 2.4 M NaCl to determine total extractable protein (TEP). Increased NaCl level in extraction buffers increased TEP, but NaCl levels of 2.25 and 4.5% in meat interfered with release of solubilized proteins into extraction solutions. Restructured beef roasts of 0, 0.45 or 0.9% NaCl and 0, 0.225 or 0.45% sodium tripolyphosphate (STPP) were manufactured with 10% mechanically separated beef (MSB), …

Go to article

Genetic Comparisons And Systematic Studies Of Termites (Isoptera)., Amy Kathryn Korman Jan 1990

Genetic Comparisons And Systematic Studies Of Termites (Isoptera)., Amy Kathryn Korman

LSU Historical Dissertations and Theses

Eusociality has evolved in only two insect orders: the Isoptera and Hymenoptera. While hymenopteran genetics has been the subject of intensive study, genetic information on termites is conspicuously lacking. The purpose of this dissertation was to utilize starch gel electrophoresis in genetic studies of termites. Chapter I consists of electrophoretic methods and a study of genetic variability among four families of termites. Although some representative species/colonies demonstrated low levels of variation, the ranges of polymorphic loci and gene diversity were within levels generally observed for the class Insecta. Levels of genetic variation exhibited by termites were higher than those values …

Go to article

The Socioeconomic Aspects Of Beef Cattle Production In Louisiana., Emmanuel Kagaba Nzabanita Jan 1990

The Socioeconomic Aspects Of Beef Cattle Production In Louisiana., Emmanuel Kagaba Nzabanita

LSU Historical Dissertations and Theses

This study was divided into: (1) a descriptive study of the farm resources, management practices, veterinary services utilization, and socio-psychological characteristics of Louisiana ranchers in relation to beef cattle performance, (b) a classification of the ranchers according to their utilization of veterinary services with the objective of identifying producer characteristics that are associated with frequent, moderate, and non-use of veterinary services, and (c) identification of factors associated with continuing or ending beef cattle production. The intensity of management, herd health and veterinary services utilization was quantified by scoring and ranking indicator variables that defined these composite variables. Most ranchers had …

Go to article

The Uneasiest State: Art, Culture, And Society In New Deal Louisiana, 1933-1943. (Volumes I And Ii)., Richard B. Megraw Jan 1990

The Uneasiest State: Art, Culture, And Society In New Deal Louisiana, 1933-1943. (Volumes I And Ii)., Richard B. Megraw

LSU Historical Dissertations and Theses

During the Great Depression artists working in programs funded by the federal government roamed the nation wielding brushes, jotting notes, and pointing cameras in an attempt to define and characterize American society. Never before and not since has this country conducted so intensive a survey of itself, or one so controversial. Federal patronage of the arts occurred during an anxious period of political and cultural turmoil, a turmoil inherent in the story of the Arts Projects themselves. The very structure, organization, composition, execution, and objectives of the arts agencies mirror the tensions of the age. The artists' selection or avoidance …

Go to article

Estimation Of Additive And Heterotic Direct And Maternal Genetic Effects For Carcass Traits In Beef Steers., Sidney Marc Derouen Jan 1990

Estimation Of Additive And Heterotic Direct And Maternal Genetic Effects For Carcass Traits In Beef Steers., Sidney Marc Derouen

LSU Historical Dissertations and Theses

Carcass measurements were taken on straightbred and crossbred steers to estimate least squares means and heterosis (1,494 steers) and, to partition additive and heterotic genetic effects (1,536 steers) on hot carcass weight (HCWT), retail yield (YIELD), ribeye area (REA), fat thickness (FT), marbling score (MS) and Warner-Bratzler shear (WBS). Steers were produced over four generations in a rotational crossbreeding study and consisted of Angus (A), Brahman (B), Charolais (C) and Hereford (H) breeds. Two-, three- and four-breed rotation systems were generated with the restriction that each breed combination include the B. Straightbreds were maintained as controls. Treatment, mating system and …

Go to article

Seasonal And Daily Variations In Plasma Hormone Concentrations Of The Gulf Killifish, Fundulus Grandis., Arnil Cabading Emata Jan 1990

Seasonal And Daily Variations In Plasma Hormone Concentrations Of The Gulf Killifish, Fundulus Grandis., Arnil Cabading Emata

LSU Historical Dissertations and Theses

Circadian rhythms of hormone secretion and responsiveness to hormones were examined in the gulf killifish. The findings provide additional information to support the hypothesis that reproductive, metabolic and behavioral activities are regulated in part by a temporal interaction of circadian rhythms. These findings include: (1) Daily injections of drugs that influence serotonergic (5-hydroxytryptophan, 5-HTP) and dopaminergic (dihydroxyphenylalanine, DOPA) activities induce conditions appropriate to either summer or winter, and can determine the manner in which a fish reacts reproductively and metabolically to water temperature, the main environmental determinant. (2) Tryptophan-enriched diets stimulated increases in plasma triiodothyronine and somatomedin-C levels, dramatically stimulated …

Go to article

Ribosomal Rna And The Early Evolution Of Flowering Plants., Robert Keith Hamby Jan 1990

Ribosomal Rna And The Early Evolution Of Flowering Plants., Robert Keith Hamby

LSU Historical Dissertations and Theses

Since the end of the last century, the predominant theories of the early radiation of the angiosperms have been that the earliest flowering plants were most similar to the present-day Magnoliidae (sensu Takhtajan, 1969). This position has been adopted by many, though there are some who suggest that the base of angiosperm radiation lies within the monocots (Burger, 1981) or a combination of monocots and dicots (Burger, 1977; Donoghue and Doyle, 1989a, 1989b). Many different ancestors to the angiosperms themselves have been proposed including, at one time or another, most of the extant gymnosperms, extinct gymnosperms and the extinct seed …

Go to article

Studies On Important Volatile Flavor Components In Louisiana Rangia Clam (Rangia Cuneata)., Uraiwan Tanchotikul Jan 1990

Studies On Important Volatile Flavor Components In Louisiana Rangia Clam (Rangia Cuneata)., Uraiwan Tanchotikul

LSU Historical Dissertations and Theses

Important flavor components in Louisiana brackish water clam (Rangia cuneata) were investigated in this dissertation research. Major achievements include: (1) positive identification of the major compound responsible for the objectionable musty/earthy off-flavor in the clam, (2) development of quantitative method to compare the levels of the off-flavor compound in clam samples before and after relaying, and (3) identification of desirable characteristic clam volatile flavor components. The identification of the musty/earthy off-flavor of rangia clam was accomplished by using dynamic headspace sampling (DHS) coupled with high resolution gas chromatography/mass spectrometry (HRGC/MS) in selective ion monitoring (SIM) mode and HRGC aroma perception. …

Go to article

Biology Of The Twospotted Spider Mite, Tetranychus Urticae (Acari:Tetranychidae) On Several Genotypes Of Soybean And Effects On A Predator Mite, Phytoseiulus Persimilis (Acari:Phytoseiidae)., Jo Ann Canal Wheatley Jan 1990

Biology Of The Twospotted Spider Mite, Tetranychus Urticae (Acari:Tetranychidae) On Several Genotypes Of Soybean And Effects On A Predator Mite, Phytoseiulus Persimilis (Acari:Phytoseiidae)., Jo Ann Canal Wheatley

LSU Historical Dissertations and Theses

In a laboratory experiment with five genotypes of soybean, Glycine max (L.) Merrill, developmental time and fecundity of Tetranychus urticae Koch was measured. Developmental time for virgin females on leaf disks was shortest on Plant Introduction (PI) 227687, 'DSR 352,' and 'Williams.' There were no differences in development time for male mites due to genotype. Females laid more eggs per day on PI 227687 and more total eggs on PI 227687 and 'DSR 352' than on 'Williams,' 'Clark,' and 'Davis.' Life tables were constructed for mite cohorts on each soybean genotype. Values for r, intrinsic rate of increase, ranged from …

Go to article

Using The Domestic Chicken Egg For Culturing Preimplantation Mammalian Embryos., Eldred Griffin Blakewood Jan 1990

Using The Domestic Chicken Egg For Culturing Preimplantation Mammalian Embryos., Eldred Griffin Blakewood

LSU Historical Dissertations and Theses

A novel embryo culture system has been developed using 96-hour chick embryos. One to four mammalian embryos can be injected into the chick embryo amnion (CEA) and allowed to develop for 72 to 96 hours. Pronuclear-stage mouse embryos from two different strains were cultured in the CEA or in Whitten's medium. There were more expanded blastocysts from one strain of embryos when cultured in the CEA. More hatched blastocysts resulted from embryos of both strains when cultured in the CEA. Two to eight-cell goat embryos cultured in the CEA for 72 hours or on cell monolayers reached to blastocyst stage …

Go to article

Spinach Carbonic Anhydrase: Primary Sequence, Transport Into Chloroplasts And Expression In Escherichia Coli., Timothy William Fawcett Jan 1990

Spinach Carbonic Anhydrase: Primary Sequence, Transport Into Chloroplasts And Expression In Escherichia Coli., Timothy William Fawcett

LSU Historical Dissertations and Theses

Carbonic anhydrase (CA) catalyzes the reversible hydration of CO$\sb2$. Plant carbonic anhydrases are structurally distinct from those found in animals. In C$\sb3$ plants, the enzyme is located in chloroplasts. To date, little structural information on the enzyme from plants has been available. In this study the full-length cDNA for the spinach chloroplast CA was sequenced. The cDNA contained 1,156 base pairs. The open reading frame encoded a protein of 34,569 daltons. Comparison of the N-terminal sequence of this protein with that of other chloroplast precursors indicated that CA is synthesized as a precursor. The transit peptide likely contains about 60 …

Go to article

The Introduction Of A Gene Encoding A Novel Peptide Into Plants To Increase Plant Bacterial Resistance., Pablito Garcia Nagpala Jan 1990

The Introduction Of A Gene Encoding A Novel Peptide Into Plants To Increase Plant Bacterial Resistance., Pablito Garcia Nagpala

LSU Historical Dissertations and Theses

A 38 amino acid long peptide, Shiva-1, was designed and chemically synthesized in our laboratory. Shiva-1 has only 46% amino acid homology with the naturally occurring lytic peptide from Hyalophora cecropia, known as Cecropin B. However, hydrophobic properties and charge density of the natural molecule were conserved at 100% in the synthetic peptide. This novel peptide was shown to be capable of killing a number of different species of plant pathogenic bacteria at nanomolar concentrations. Comparative studies show that Shiva-1 is more effective in this bacteriolytic activity than Cecropin B. The gene for Shiva-1 was chemically synthesized and cloned into …

Go to article

Narrative And Everyday Experience: Performance Process In The Storytelling Of The Swiss Volhynian Mennonites. (Volumes I And Ii)., John Elmer Mccabe-Juhnke Jan 1990

Narrative And Everyday Experience: Performance Process In The Storytelling Of The Swiss Volhynian Mennonites. (Volumes I And Ii)., John Elmer Mccabe-Juhnke

LSU Historical Dissertations and Theses

This study examines oral narrative performance within the cultural context of the Swiss Volhynian Mennonites in Moundridge, Kansas, whose forebears were members of a congregational group that migrated from the Russian Province of Volhynia in 1874. These immigrants strove to maintain Gemeinde--a mutually supportive community of believers separated from the world. A Swiss Volhynian Mennonite himself, the author tape-recorded interviews with second and third generation descendants of the Russian immigrants. Using the interview transcriptions and personal observation in the Moundridge community as primary data, the author demonstrates how the formative elements of everyday narrative performance both sustain and are shaped …

Go to article

The Mechanism Of Low Levels Of Nitrogen Dioxide Reaction With Unsaturated Fatty Acid Esters., Aris Ann Gallon Jan 1990

The Mechanism Of Low Levels Of Nitrogen Dioxide Reaction With Unsaturated Fatty Acid Esters., Aris Ann Gallon

LSU Historical Dissertations and Theses

Nitrogen Dioxide is a toxic air pollutant that exists at less than 0.5 ppm in the atmosphere. This toxic compound is known to initiate autoxidation of unsaturated fatty acids both in vivo and in vitro. When autoxidation occurs in vivo, membrane damage that can lead to cell death can occur. Low concentrations of nitrogen dioxide were shown to react with the polyunsaturated fatty acid esters, methyl linoleate and methyl linolenate, by a H-abstraction mechanism. However, methyl oleate, an unsaturated fatty acid ester, was demonstrated to react with a low concentration of nitrogen dioxide by only an addition mechanism. Although methyl …

Go to article

Semilunar Spawning In Killifish, Fundulus Grandis., Shyh-Min Hsiao Jan 1990

Semilunar Spawning In Killifish, Fundulus Grandis., Shyh-Min Hsiao

LSU Historical Dissertations and Theses

Gulf killifish, Fundulus grandis, spawned daily in aquaria exposed to 12-hr daylengths and 21 to 28$\sp\circ$C temperatures. The number of eggs spawned varied daily producing a peak about every 13.7 days. Ovarian studies indicate that increased maturation of peripheral germinal-vesicle oocytes in preparation for spawning begins five days before the semilunar spawning peak. There is an increase in numbers of hydrated oocytes and ovulated eggs reaching a maximum on or a day before peak spawning. Semilunar spawning cycles of F. grandis are expressions of an endogenous rhythm. Although a specific phase of the semilunar cycle is maintained with respect to …

Go to article

The Design And Expression Of A Synthetic Gene Encoding A Novel Polypeptide To Enhance The Quality Of Plant Protein., Jaeho Kim Jan 1990

The Design And Expression Of A Synthetic Gene Encoding A Novel Polypeptide To Enhance The Quality Of Plant Protein., Jaeho Kim

LSU Historical Dissertations and Theses

A novel protein (HEAAE II, High Essential Amino Acid Encoding Protein), rich in essential amino acids (75% of total), was designed and constructed in our laboratory. The monomeric form of the protein consists of 20 amino acid residues with four additional amino acids comprising a potential $\beta$-turn. Circular dichroism and size exclusion analysis demonstrated, that the monomer exists in a stable $\alpha$-helical conformation that self-aggregates in aqueous solution to form higher ordered multimeric structures, which are very reminiscent of natural plant storage proteins. The DNA encoding this amino acid sequence was synthesized, and from this monomeric gene fragment, the tetrameric …

Go to article

Evaluation Of The Crawfish Chitin-Carotenoid Complex And Its Nutritional/Pigmentation Effect In Poultry Diets., Keun Soo Lee Jan 1990

Evaluation Of The Crawfish Chitin-Carotenoid Complex And Its Nutritional/Pigmentation Effect In Poultry Diets., Keun Soo Lee

LSU Historical Dissertations and Theses

The present investigation involved utilization of the chitin-carotenoid complex and the whole meal derived from crayfish (Procambarus clarkii) composite byproduct, in controlled broiler diets to determine the biological value of these substrates as potential sources of growth promoters, red intensifying agents, and protein supplements. Included are basic studies of the unique characteristics of the chitin-protein and chitin-carotenoid complexes. The crawfish chitin-carotenoid substrate did not exhibit any deleterious effects on broiler growth performance in terms of animal weight gain and feed efficiency at levels up to 5% of the total diet. Controlled chitin addition to the diet indicated no apparent relationship …

Go to article

Evaluation Of Aeromonas Hydrophila Virulence Factors: Role In Natural Epizootics And Their Use As Potential Immunogens., Larisa Ann Ford Jan 1990

Evaluation Of Aeromonas Hydrophila Virulence Factors: Role In Natural Epizootics And Their Use As Potential Immunogens., Larisa Ann Ford

LSU Historical Dissertations and Theses

Aeromonas hydrophila and A. sobria have been identified as major causes of mortalities among commercially raised channel catfish and are the cause of septicemic diseases in a wide variety of other animals. At present, antibiotic therapy is the only prescribed treatment for Motile Aeromonad Septicemia (HAS) in channel catfish. Antibiotic treatment, however, is expensive and often not effective due to the development of resistance in the bacterial strains. Development of immunoprophylatic methods for the prevention of HAS would be of value and use to the commercial catfish industry. Several studies have demonstrated that whole cell vaccine preparations do not confer …

Go to article

Environmental And Economic Influences On The Oyster Fishery Of Lower Barataria Bay, Louisiana., Earl Joseph Melancon Jr Jan 1990

Environmental And Economic Influences On The Oyster Fishery Of Lower Barataria Bay, Louisiana., Earl Joseph Melancon Jr

LSU Historical Dissertations and Theses

A three year study, 1982-85, of eight oystermen bedding on 19 leases in lower Barataria Bay was designed to determine lease production, fuel, labor and energy inputs and the expenses to operate. The data was then incorporated into a bioeconomic model of the lower Bay. Commercial yield ratios (sacks harvested:sacks bedded) per lease ranged from 0.03$-$1.68:1. The two lowest lease yields were the result of vandalism and poaching, respectively. A multiple linear equation developed from the data predicts that as salinity and water temperature increase, lease yields decrease. Utilization of the Bay's bedding leases are dependent on seed obtained from …

Go to article

Investigation Of Flow Patterns In Various Wastewater Treatment Facilities, Thomas Joseph Martin Jr Nov 1989

Investigation Of Flow Patterns In Various Wastewater Treatment Facilities, Thomas Joseph Martin Jr

LSU Historical Dissertations and Theses

The theoretical hydraulic retention time of wastewater treatment plants is often used to predict the efficiency of treatment and to calculate operational parameters. However, these values are related to the actual hydraulic retention time. When there is a large discrepancy between the actual and predicted values, the actual hydraulic retention time can be determined by marking a parcel of wastewater and recording its passage through the system. This investigation utilized rhodamine WT, a fluorescent dye, to track the movement of wastewater through a stabilization lagoon and a rock-reed filter. The loss of rhodamine WT to sorption, biodegradation and photodegradation was …

Go to article

Louisiana Agriculture Magazine, Fall 1989, Lsu Agricultural Experiment Station Oct 1989

Louisiana Agriculture Magazine, Fall 1989, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

Go to article

Louisiana Agriculture Magazine, Summer 1989, Lsu Agricultural Experiment Station Jul 1989

Louisiana Agriculture Magazine, Summer 1989, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

Go to article

First Prev Next Last