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Molecular Cloning And Analysis Of The Cry1 Gene: A Yeast Ribosomal Protein Gene, John C. Larkin, John L. Woolford Jan 1983

Molecular Cloning And Analysis Of The Cry1 Gene: A Yeast Ribosomal Protein Gene, John C. Larkin, John L. Woolford

Faculty Publications

Using cloned DNA from the vicinity of the yeast mating type locus (MAT) as a probe, the wild type allele of the cryptopleurine resistance gene CRY1 has been isolated by the technique of chromosome walking and has been shown to be identical to the gene for ribosomal protein 59. A recessive cryRl allele has also been cloned, using the integration excision method.The genetic distance from MAT to CRY1 is 2.2 cM, while the physical distance is 21 kb, giving a ratio of about 10kb/cM for this interval. The phenotypic expression of both plasmid borne alleles of the gene can be …

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Circadian Systems In Development And Photoperiodism In Japanese Quail., Albert C. Russo Jr Jan 1983

Circadian Systems In Development And Photoperiodism In Japanese Quail., Albert C. Russo Jr

LSU Historical Dissertations and Theses

Section I: The daily rhythm of plasma levels of adrenal corticol hormones (ACH) differed in phase and amplitude in Japanese quail of different ages and reproductive condition. Treatment with thiouracil accelerated and thyroxine delayed maturation of the ACH rhythm and development of the reproductive system. In contrast to the ACH rhythm, the rhythm of plasma thyroxine concentrations was similar at all ages tested. Section II: The roles of circadian rhythms in photoperiodism as they relate to adrenal cortical hormone (ACH) were examined in male Japanese quail, Coturnix coturnix japonica. Plasma ACH concentration was found to undergo circadian variations, which varied …

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Control Of The Sweetpotato Weevil In Planting Material, Lawrence H. Rolston Jan 1983

Control Of The Sweetpotato Weevil In Planting Material, Lawrence H. Rolston

LSU Agricultural Experiment Station Reports

No abstract provided.

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Activity Of Myo-Inositol-1-Phosphate Synthase In The Epididymal Spermatozoa Of Rams., M. W. Loewus, R. W. Wright, K. R. Bondioli, D. L. Bedgar, A. Karl Jan 1983

Activity Of Myo-Inositol-1-Phosphate Synthase In The Epididymal Spermatozoa Of Rams., M. W. Loewus, R. W. Wright, K. R. Bondioli, D. L. Bedgar, A. Karl

Faculty Publications

Studies of six 8-9-month-old rams showed that the specific activities of myoinositol-1-phosphate synthase (EC 5.5.1.4) were highest in epididymal spermatozoa, intermediate in testis and lowest in epididymal tissue. The activity per spermatozoon decreased from caput to cauda. The levels of activity of myo-inositol-1-phosphate synthase in ejaculated spermatozoa from four 3-year-old rams and the seminal vesicles of two 3-year-old rams were insignificant, but in pooled Sertoli cells from the testes of young lambs, the specific activity was much lower than in epididymal spermatozoa although activity per cell was of the same order of magnitude. We conclude that epididymal spermatozoa contain a …

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Age-Related And Seasonal Variation In The Sertoli Cell Population, Daily Sperm Production And Serum Concentrations Of Follicle-Stimulating Hormone, Luteinizing Hormone And Testosterone In Stallions, L. Johnson, D. L. Thompson Jan 1983

Age-Related And Seasonal Variation In The Sertoli Cell Population, Daily Sperm Production And Serum Concentrations Of Follicle-Stimulating Hormone, Luteinizing Hormone And Testosterone In Stallions, L. Johnson, D. L. Thompson

Faculty Publications

No abstract provided.

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A Non-Hemolytic, Group B Streptococcus Infection Of Cultured Bullfrogs, Rana Catesbeiana, In Brazil., R. L. Amborski, T. G. Snider, R. L. Thune, D. D. Culley Jan 1983

A Non-Hemolytic, Group B Streptococcus Infection Of Cultured Bullfrogs, Rana Catesbeiana, In Brazil., R. L. Amborski, T. G. Snider, R. L. Thune, D. D. Culley

Faculty Publications

A systemic streptococcal infection in cultured bullfrogs in Brazil was characterized by necrotizing splenitis and hepatitis with hepatic and renal hemorrhage. A non-hemolytic Group B Streptococcus appeared to be the cause of the lesions, and the stimulus for the splenic reticuloendothelial hyperplasia observed in the animals. Stress may have been a factor in the development of the pathological condition.

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Energy Metabolism Pathways Of Hydrothermal Vent Animals: Adaptations To A Food-Rich And Sulfide-Rich Deep-Sea Environment., S. C. Hand, G. N. Somero Jan 1983

Energy Metabolism Pathways Of Hydrothermal Vent Animals: Adaptations To A Food-Rich And Sulfide-Rich Deep-Sea Environment., S. C. Hand, G. N. Somero

Faculty Publications

Examined the large pogonophoran tube worm Riftia pachyptila, clam Calyptogena magnifica, crab Bythograea thermydron, polychaete worm Alvinella pompejana, and an unidentified zoarcid fish. In general, enzymic activities found in the tissues of the vent animals were qualitatively and quantitatively similar to those of phylogenetically related shallow-living marine species, suggesting that the types of energy metabolism pathways, and the potential flux rates through these pathways, are similar in both groups. -from Authors

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Urinary Sodium Excretion And Blood Pressure In Children: Absence Of A Reproducible Association, Richard Cooper, Kiang Liu, Maurizio Trevisan, William Miller, Jeremiah Stamler Jan 1983

Urinary Sodium Excretion And Blood Pressure In Children: Absence Of A Reproducible Association, Richard Cooper, Kiang Liu, Maurizio Trevisan, William Miller, Jeremiah Stamler

Faculty Publications

A previous report by our group described a cross-sectional association between urinary sodium excretion and blood pressure (BP) in children. Attempts were made to reproduce these findings in two subsequent studies carried out with an identical protocol. Although descriptive results were similar and the correlations between measures of body size and blood pressure were reproduced, a clear-cut association between 7-day mean urinary sodium excretion and BP was observed only in the first of the three studies. These results could imply inadequate study methods, an inconsistent and weak relationship, or the absence of a relationship altogether. © 1983 American Heart Association, …

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Abnormal Red Blood Cell Ion Transport And Hypertension: The People’S Gas Company Study, Maurizio Trevisan, David Ostrow, Richard Cooper, Kiang Liu, Stephen Sparks, Anna Okonek, Elizabeth Stevens, John Marquardt, Jeremiah Stamler Jan 1983

Abnormal Red Blood Cell Ion Transport And Hypertension: The People’S Gas Company Study, Maurizio Trevisan, David Ostrow, Richard Cooper, Kiang Liu, Stephen Sparks, Anna Okonek, Elizabeth Stevens, John Marquardt, Jeremiah Stamler

Faculty Publications

A population-based survey of 134 white men, recruited from the Chicago People’s Gas Company labor force, was carried out to examine the association between sodium-lithium (Na-Li) countertransport and hypertension. Of the 134 participants in this industry-sponsored periodic health examination, 64 were normotensive and 70 were either taking antihypertensive medications or had a systolic pressure ≥ 140 or a diastolic pressure ≥ 90 mm Hg. The hypertensives were older and more overweight. Countertransport was significantly higher in hypertensives than in normotensives. Among the three subgroups of hypertensives - untreated borderline (140/90 to 160/95 mm Hg), untreated definite (over 160/95 mm Hg), …

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Is The Period Of Rapidly Declining Adult Mortality In The United States Coming To And End?, R. Cooper, R. Cohen, A. Amiry Jan 1983

Is The Period Of Rapidly Declining Adult Mortality In The United States Coming To And End?, R. Cooper, R. Cohen, A. Amiry

Faculty Publications

Age-standardized death rates from all causes for persons age 35-74 fell 23 per cent, 1968-1979. The monotonic decline was interrupted by only one period of excess influenza mortality. In the late 1970s, however, the decline in mortality decelerated and no further decrease was observed, 1979-1981. The recurrence of epidemic influenza contributed significantly to this trend although it would appear that the underlying mortality pattern has begun to change.

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A Taxonomy For Industrial Salesforce Job Activities., William C. Moncrief Iii Jan 1983

A Taxonomy For Industrial Salesforce Job Activities., William C. Moncrief Iii

LSU Historical Dissertations and Theses

A taxonomy developed of specific selling activities of industrial salespeople was developed to differentiate "types" of salespeople. The taxonomy was developed based on the responses of 1393 salespeople from 51 companies to a survey of the frequency with which they performed activities, and the time spent to perform each activity. The first stage of the research was the compilation of an exhaustive list of sales activities. These activities were collected from a series of focus groups and personal interviews. The questionnaire was formulated based on the 121 sales activities collected from the focus groups. Two scales were designed and implemented …

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The Mechanism Of Aldosterone Secretion In Dairy Cattle And The Circadian Rhythm Of Aldosterone, Cortisol And Progesterone In Dairy Cattle During Summer In Louisiana., Teodora Javier Aranas Jan 1983

The Mechanism Of Aldosterone Secretion In Dairy Cattle And The Circadian Rhythm Of Aldosterone, Cortisol And Progesterone In Dairy Cattle During Summer In Louisiana., Teodora Javier Aranas

LSU Historical Dissertations and Theses

A study of the basic mechanism of aldosterone secretion was performed on 15 month old Holstein heifers. Animals were fitted with indwelling jugular catheters and estrous cycle was synchronized with PGF(,2(alpha)). Effects of adrenocorticotrophic hormone (ACTH) and angiotensin II (AII) on the secretion of aldosterone, cortisol, progesterone and other parameters such as sodium and potassium that influenced aldosterone secretion were analyzed by Latin Square design, replicated twice. Treatments consisted of intravenous injections of 200 I.U. ACTH/animal, 18 mg AII/animal, or physiological saline. Blood samples were collected before treatment (0 min), at fifteen and thirty minutes after treatment, and at hourly …

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Growth And Metabolic Responses Of Saccharum Species In Relation To Flooding., A. B. M. Mafizur Rahman Jan 1983

Growth And Metabolic Responses Of Saccharum Species In Relation To Flooding., A. B. M. Mafizur Rahman

LSU Historical Dissertations and Theses

Some growth and metabolic responses of different clones of Saccharum in relation to their flood-tolerance were examined. Clones grown in soil subjected to flooding demonstrated their ability to produce water roots as a means of morphological adaptation to flooding. Significant differences were observed among the clones with respect to the quantities of water roots produced, but all the clones were visually tolerant to flooding. Clones representing Saccharum spontaneum followed by the commercial hybrid produced the maximum quantities of water root under the flooded condition. The clones of Saccharum barberi and Saccharum robustum produced the least quantities of water root. Artificially …

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Bioavailability Of Iron In Beef And Beef-Soybean Mixtures., Felipe Diez Jan 1983

Bioavailability Of Iron In Beef And Beef-Soybean Mixtures., Felipe Diez

LSU Historical Dissertations and Theses

In-vivo and in-vitro studies were conducted to measure bioavailability of iron from beef and beef-soy mixtures. The effects of cooking temperature and method of cooking were investigated. Animals absorbed non-heme iron better than heme forms and utilized iron contained in beef-soy diets as efficiently as that contained in beef diets. Colorimetric iron values of 17.18, 6.0, and 9.02% were obtained in raw, broiled and microwaved beef samples, respectively. A similar trend was observed in beef-soy mixtures when analyzed raw (11.03), broiled (6.32) or microwaved (2.21). Iron contained in beef-soy flour mixtures was dialyzed in a larger proportion (16.60%) as compared …

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The Regulation Of Gene Expression During The Aerobic Germination Of Mucor Racemosus Sporangiospores., John Edgar Linz Jan 1983

The Regulation Of Gene Expression During The Aerobic Germination Of Mucor Racemosus Sporangiospores., John Edgar Linz

LSU Historical Dissertations and Theses

This study was undertaken to investigate the regulation of gene expression during the aerobic germination of Mucor racemosus sporangiospores. Sucrose density gradient analysis of spore extracts revealed that the percentage of ribosomes associated with mRNA increased from 23% in dormant spores to 85% after 10 min of germination. L-{('14)C}leucine was immediately incorporated at a rapid rate into protein of a leucine auxotroph, whereas {('3)H}uracil or {('32)P}-phosphate were not incorporated into RNA at a significant rate until 20 min after the addition of medium. Newly synthesized RNA did not appear in polysomes until at least 30 min. Polyadenylated RNA, comprising 3.3% …

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Evidence For An Outer Membrane - Association Precursor Of The Extracellular Protease Produced By Serratia Marcescens., Laura Robin Liss Jan 1983

Evidence For An Outer Membrane - Association Precursor Of The Extracellular Protease Produced By Serratia Marcescens., Laura Robin Liss

LSU Historical Dissertations and Theses

Serratia marcescens LRL781, a gram-negative bacterium, produces an extracellular protease. Evidence is provided for an outer membrane-associated, larger molecular weight, enzymatically inactive precursor of the protease. Antiserum was prepared against the extracellular protease, which was purified from the supernatant fraction of S. marcescens LRL781 cultures. Column adsorption of the antiprotease serum was performed using a slurry of live cells and cellulose. The resulting effluent was serologically inactive against protease preparations and chromium chloride-coupled protease-rabbit erythrocytes. Whole washed cells agglutinated in the presence of the antiserum. Cells were uniformly labeled with ferritin conjugated goat anti-rabbit IgG, indicating that the protease precursor …

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Effect Of Isolated Soy Protein On The Bioavailability Of Copper In Ground Beef., James L. Smith Jan 1983

Effect Of Isolated Soy Protein On The Bioavailability Of Copper In Ground Beef., James L. Smith

LSU Historical Dissertations and Theses

Test diets containing ground beef extended with 0, 10, 20 and 30% ISP were fed to Single Comb White Leghorn chicks and 28 days to determine the effect of isolated soy protein (ISP) on the availability of copper naturally present in meat. Copper content of the test diets decreased with increasing levels of ISP, ranging from 6.89 (+OR-) 0.17 ppm to 2.09 (+OR-) 0.12 ppm. Mean feed consumption per diet also decreased with increasing ISP levels as did the amount of copper consumed per bird. Although the mg copper consumed per bird decreased from diet I to diet IV, the …

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The Impact Of Sompa Elp Scores On Special Education Evaluation And Placement., Alan Lesley Taylor Jan 1983

The Impact Of Sompa Elp Scores On Special Education Evaluation And Placement., Alan Lesley Taylor

LSU Historical Dissertations and Theses

The impact of the use of SOMPA Estimated Learning Potential (ELP) scores as a substitute for traditional IQ scores was examined as it affected students evaluated for special education in a large metropolitan school system. SOMPA is the System of Multicultural Pluralistic Assessment, an evaluation package developed by Jane Mercer (1979) to address concerns about bias in assessment of minority students and particularly to remove "unfair" labels of mental retardation. ELP scores represent IQ scores adjusted for the effects of sociocultural background and compared only to ethnic peer norms, with the general effect being to raise estimates of intellectual potential …

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Water Budget, Benthological Characterization, And Simulation Of Aquatic Material Flows In A Louisiana Freshwater Swamp., Fred Hal Sklar Jan 1983

Water Budget, Benthological Characterization, And Simulation Of Aquatic Material Flows In A Louisiana Freshwater Swamp., Fred Hal Sklar

LSU Historical Dissertations and Theses

A two-year survey of the aquatic plants and invertebrates in the Des Allemands Swamp was designed to determine the ecological effects of altered hydrologic regimes. The aquatic invertebrate community in an impoundment was compared with a control site subject to "normal" overflow flooding and a crawfish farm where high rates of water exchange are maintained by a system of pumps and artificial levees. Swamp hydrology for the years 1914-1980 was modeled using Thornthwaite and Mather components. Time-series analysis found no evidence of any long-term cyclical behavior. High evapotranspiration and drainage during summer decrease water levels to zero in natural swamp …

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A History Of The Louisiana State University School Of Music (1955-1979). (Volumes I And Ii)., Brenda Gale Williams Jan 1983

A History Of The Louisiana State University School Of Music (1955-1979). (Volumes I And Ii)., Brenda Gale Williams

LSU Historical Dissertations and Theses

This report provides an organized and accurate chronology of the history of the LSU School of Music from 1955 to 1979, encompassing the tenure of Dr. Everett L. Timm, as administrator of the School of Music. Areas examined included faculty, curricula, enrollment, degrees awarded, facilities, budget, expenditures, performing groups, performances, and special events. The historical method of research was employed using a two-fold procedure: (1) interviews with present and former students, faculty, and deans; and (2) examinations of University and School of Music records and publications, and reports from local, state, and national publications. An investigation of assembled data indicated …

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The Beta-Fructofuranosidase Of Kluyveromyces Fragilis And Its Use In Inulin Hydrolysis., Wesley Earl Workman Jan 1983

The Beta-Fructofuranosidase Of Kluyveromyces Fragilis And Its Use In Inulin Hydrolysis., Wesley Earl Workman

LSU Historical Dissertations and Theses

Inulin, a polyfructan, is found as the reserve carbohydrate in the roots and tubers of various plants. The (beta)-fructofuranosidase (inulase) from the yeast Kluyveromyces fragilis is of interest because of its industrial potential in fructose syrup and alcohol production from inulin containing plants. The enzyme was purified and characterized with respect to its physical and kinetic parameters. The relationship between the enzyme and the yeast cell wall was also investigated. It was found that the inulase of Kluyveromyces fragilis could be immobilized in the yeast cells by glutaraldehyde treatment. Although the exact nature of the immobilization is not fully understood …

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Sodium Ion Transport Regulation By A Serotonin Stimulated Adenylate Cyclase System In Freshwater Mussels., John Iver Scheide Jan 1983

Sodium Ion Transport Regulation By A Serotonin Stimulated Adenylate Cyclase System In Freshwater Mussels., John Iver Scheide

LSU Historical Dissertations and Theses

Freshwater bivalves increase Na influx when the mussels were injected with dibutyryl cAMP, serotonin (5-HT), or 5-HT (10('-4) M/l) was added to the bath; a response similar to a sodium depleted mussel. Serotonin stimulated Na influx kinetics (K(,m) = 0.09 mM/l and J(,max) = 4.33 (mu)eq (g dry tissue (.) hr)('-1) were similar to Na depleted mussels. Stimulated Na influx (by dibutyryl cAMP or 5-HT) was inhibited by amiloride (5 x 10('-4) M/l) and the amiloride inhibition was reversible. Serotonin also changes water balance; the 5-HT stimulated mussels gain 0.36 ml H(,2)O (g dry tissue (.) hr)('-1) above controls. Serotonin …

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The Effects Of Two Twelve-Week Training Programs On Sequential Measurements Of Blood Lipids, Hormones, Cardiovascular Function, Body Composition, And Strength In Sedentary Middle-Aged Males., Daniel Lee Blessing Jan 1983

The Effects Of Two Twelve-Week Training Programs On Sequential Measurements Of Blood Lipids, Hormones, Cardiovascular Function, Body Composition, And Strength In Sedentary Middle-Aged Males., Daniel Lee Blessing

LSU Historical Dissertations and Theses

A twelve-week study was conducted to determine the effects of weight training and jogging on serum lipids and hormones, cardiovascular function, body composition, and strength. Thirty-three subjects (mean age 45 + 6 years) comprised a weight training group (N = 9), running group (N = 11), and a control group (N = 13). All subjects exercised 3 days per week for 12 weeks. Statistical comparisons were completed by using a 3 x 3 ANOVA with repeated measures on time. Single Degree of Freedom Comparisons were used to examine the specific hypotheses about the differential effects across time among groups. The …

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Systematics, Redescription, And Geographic Variation Of The Blackside Darter, Percina Maculata (Pisces; Percidae)., Eugene Clifton Beckham Iii Jan 1983

Systematics, Redescription, And Geographic Variation Of The Blackside Darter, Percina Maculata (Pisces; Percidae)., Eugene Clifton Beckham Iii

LSU Historical Dissertations and Theses

A systematic study of the North American percid fish Percina (Alvordius) maculata (Girard) was undertaken to determine the extent and pattern of geographic variation, subspeciation, and sexual dimorphism. A brief nomenclatorial history is presented, the species is redescribed, and variation, distribution, habitat, and subgeneric relationships are discussed. Other than dorsal fin pigmentation, absence of modified midventral scales in females, and limited intrapopulational sexual dimorphism in a few morphometric characters, no variation in most of the thirty-nine characters examined is present between males and females. Morphometrics exhibited no pattern of geographic variation; however, meristic characters revealed a major trend in geographic …

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Relationship Between Gene Frequencies And Indices Of Physiological Stress In The Estuarine Gastropod, Thais Haemastoma., David Wendell Garton Jan 1983

Relationship Between Gene Frequencies And Indices Of Physiological Stress In The Estuarine Gastropod, Thais Haemastoma., David Wendell Garton

LSU Historical Dissertations and Theses

The relationship between individual energy budgets and genetic variability was examined in Thais haemastoma acclimated to 7.5, 20 and 35('o)/oo S at 21(DEGREES)C. Energy budgets, after the equations of Crisp (1971), were determined by measuring rates of caloric ingestion, absorption efficiencies, oxygen consumption and ammonia and primary amine excretion. Genotypes at six polymorphic loci coding for soluble enzymes, of 25 total loci assayed, were determined using starch gel electrophoresis. The polymorphic loci examined were those encoding for (alpha)-L-amino peptidase (LAP), phosphoglucomutase (PGM), glucose-6-phosophate dehydrogenase (G6PDH), a non-specific esterase (Est) and two dipeptidases (L-leucyl-L-proline and L-phenylalanyl-L-proline dipeptidases). The genetic variability observed …

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Nitrification At The Rice Root., Chayong Nammuang Jan 1983

Nitrification At The Rice Root., Chayong Nammuang

LSU Historical Dissertations and Theses

Nitrification at the rice root was investigated. Nitrifiers were found in the rice rhizoplane, rhizosphere and non-rhizosphere soils under flooded conditions. They were greater in the rhizoplane than in the rhizosphere soil and greatest at the heading stage of rice growth. Ammonium-sulfate or NaNO(,2) injected into the flooded soils with growing rice plants did not increase the activities of nitrifiers in the rice rhizoplane. Incubation of the flooded soil with (NH(,4))(,2)SO(,4) or NaNO(,2) did not increase the activities of NH(,4)('+)- or NO(,2)('-)-oxidizers in soils without rice. The (NH(,4))(,2)SO(,4) did not increase denitrifiers, but incubation with NaNO(,2) caused an early increase …

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Itchgrass (Rottboellia Exaltata) Response To Herbicides And Cultivation, And Subsequent Effect On Soybean (Glycine Max) Yield (Louisiana)., Paul Ruel Nester Jan 1983

Itchgrass (Rottboellia Exaltata) Response To Herbicides And Cultivation, And Subsequent Effect On Soybean (Glycine Max) Yield (Louisiana)., Paul Ruel Nester

LSU Historical Dissertations and Theses

Research was conducted during the growing seasons of 1981 and 1982 in Baton Rouge, Louisiana, to evaluate the response of itchgrass and soybean yield to weed control practices used in conventional soybean culture. Trifluralin ((alpha),(alpha),(alpha)-triflouro-2,6-dinitro-N,N = -dipropyl-p-toluidine) (preplant incorporated) at 1.8 kg/ha, alachlor {2-chloro-2',6'-diethyl-N-(methoxymethyl)acetanilide} (preemergence) at 2.4 kg/ha, or no soil applied herbicide, followed by zero, one or two overtop applications of diclofop as the methyl ester at 1.2 kg/ha {2-{4-(2,4-dichlorophenoxy)phenoxy}propanoic acid} were applied in cultivated and noncultivated areas to determine effects on seedling emergence, density, height, standing biomass and seed production of itchgrass {Rottboellia exaltata (L.) L.f.} at soybean …

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Regulation Of Macromolecular Synthesis In The Fungus Mucor Racemosus., Joseph Frederick Ross Jan 1983

Regulation Of Macromolecular Synthesis In The Fungus Mucor Racemosus., Joseph Frederick Ross

LSU Historical Dissertations and Theses

Cells of the dimorphic Zygomycetous fungus Mucor racemosus were grown in both batch and continuous culture in order to study the regulation of RNA and protein synthesis as a function of (i) growth rate, (ii) morphogenesis and (iii) nutritional shift-up. In all three cases cells were analyzed for parameters used to calculate (i) cellular ribosome concentration, (ii) percentage of ribosomes active in protein synthesis and (iii) polypeptide chain elongation rate. Cultures subjected to atmospheric or nutritional shifts were additionally pulse labelled or pulse labelled and steady-state labelled with radioactive amino acids and phosphate to measure the rates of synthesis and …

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Some Relationships Between Crop Damage Inflicted By The Sugarcane Borer, Diatraea Saccharalis (F.), And Selected Plant Diseases (Louisiana)., Emmanuel Oludele Ogunwolu Jan 1983

Some Relationships Between Crop Damage Inflicted By The Sugarcane Borer, Diatraea Saccharalis (F.), And Selected Plant Diseases (Louisiana)., Emmanuel Oludele Ogunwolu

LSU Historical Dissertations and Theses

A 3-fold difference (P < 0.05) was found in a 5-replication split plot comparison of % yield loss due to ratoon stunting disease (RSD) alone in contrast to that due to the disease in combination with sugarcane borer (SCB), Diatraea saccharalis (F.), damage in 1st stubble sugarcane. The research plan utilized differential levels of SCB damage as whole plots and a factorial combination of 2 levels of RSD (0 vs 63%) and 2 types of seed cane ( 35% SCB bored internodes) as subplots. Based on the plant cane data, a highly significant negative correlation r = -0.82, was found between SCB damage and cane weight. Loss in sugar production due to 55% SCB bored internodes was 24.4%. The association of simulated or actual SCB injury with stalk rots, particularly Colletotrichum falcatum Went, caused from 9.2-34.1% reduction in germination, and as much as 2.5 metric tons/ha loss in sugar production. Excepting SCB control, a survey spanning 2 years of sugarcane management practices among producers in 3 geographic areas of Louisiana showed substantial variability in the efficacy of control tactics applied against weeds and RSD, with effective suppression of weeds in sugarcane being the most inconsistent and difficult to achieve. These results indicate the need for an integrated approach to managing several components of pest complexes, disease, weeds, and insects in Louisiana sugarcane.

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Bacteriological And Toxigenic Studies On Vibrio Species Isolated From The Blue Crab (Callinectes Sapidus) And The Purification Of Toxic Factors Produced By Vibrio Fluvialis (Louisiana)., Susan Lynne Payne Jan 1983

Bacteriological And Toxigenic Studies On Vibrio Species Isolated From The Blue Crab (Callinectes Sapidus) And The Purification Of Toxic Factors Produced By Vibrio Fluvialis (Louisiana)., Susan Lynne Payne

LSU Historical Dissertations and Theses

Eleven cases of cholera occurred in Louisiana in 1978 and except for an isolated case in Texas in 1973, this was the first cholera outbreak in the United States since 1911. The source of the infectious agent was traced to the consumption of crabs, a finding which had adverse effects on the crab industry in Louisiana. During 1979 and 1980 blue crabs were examined bacteriologically for the presence of Vibrio cholerae, the etiological agent of Asiatic cholera, and other pathogenic Vibrio species. Four hundred-eighteen V. cholerae isolates were recovered from crab feces and 144 V. cholerae were recovered from hemolymph …

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