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 7321 - 7350 of 8029

Full-Text Articles in Entire DC Network

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 …

Go to article

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 …

Go to article

The Effect Of Viewing Art Slides On Teacher Achievement Scores., Rita Claudet Jan 1983

The Effect Of Viewing Art Slides On Teacher Achievement Scores., Rita Claudet

LSU Historical Dissertations and Theses

In 1939, the American Council on Education administered the first National Teacher Examination to senior level students. The National Teacher Examination consisted of two parts: a Common Examination and a Teaching Area Examination. In 1950, responsibility for the NTE testing was transferred to the Educational Testing Service in Princeton, New Jersey. The Literature and Fine Arts subdivision on the Core Battery test of the NTR has assumed a greater importance than the same area on the old Common Examination. The study was to determine if there was a significant difference in the Fine Arts scores on the National Teacher Examination …

Go to article

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 …

Go to article

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 …

Go to article

A Study Of Attitude Toward The Disabled Of Foreign Students From Selected Geographical Areas., Andres Maclovio Trimino Jan 1983

A Study Of Attitude Toward The Disabled Of Foreign Students From Selected Geographical Areas., Andres Maclovio Trimino

LSU Historical Dissertations and Theses

The purpose of this study was to investigate attitudes toward the disabled in foreign students at Louisiana State University. Four hundred sixty-six students were administered the Attitude Toward Disabled People scale, Form A, and a demographic questionnaire, during the Fall semester of 1982. These students were grouped in five predetermined areas of the world, as follows: Latin America; Africa; the Middle East, except Israel; Europe, Canada, and Israel; and South and East Asia. Analysis of variance and t-test were used to investigate differences of attitude among the subgroups of the sample. The following conclusions were drawn, applicable to the group …

Go to article

A Survey Of The Opinions Of Selected Secondary School Teachers Concerning In-Service Training In Educational Media (Louisiana)., Aziz Khosh-Chashmi Jan 1983

A Survey Of The Opinions Of Selected Secondary School Teachers Concerning In-Service Training In Educational Media (Louisiana)., Aziz Khosh-Chashmi

LSU Historical Dissertations and Theses

The study sought the opinions of secondary school teachers toward in-service education in educational media in regard to (1) sex of the teacher; (2) educational degree; (3) years of teaching experience; (4) grade levels taught; (5) major teaching area; (6) undergraduate media preparation; (7) graduate media preparation; and (8) participation of teacher in previous media workshops and programs. Fifty secondary schools from sixteen parishes in Louisiana were randomly selected to participate in the study. A closed questionnaire of sixty-seven items was used, and three hundred fifty-one teachers from thirty-six schools completed the answer sheets. Teachers responded to each statement of …

Go to article

The Effectiveness Of Video Technology In Safety Training At An Industrial Site., Robert Steven Miller Jan 1983

The Effectiveness Of Video Technology In Safety Training At An Industrial Site., Robert Steven Miller

LSU Historical Dissertations and Theses

Industry has long held to the belief that accidents are caused and they can be prevented. To support this belief, industry in the United States has allocated vast resources for accident prevention. The rationale for this allocation of resources rests on the concern for employees' well-being, federal and state regulations, and the profit incentive. In order to test the most feasible and effective program to generate safety awareness and teach specific safety skills, a system of daily reinforcement using an in-plant cable tablevision capability was conceptualized, designed, implemented and tested. This study presents the findings for the Safety Minutes program …

Go to article

Survival Of Vibrio Cholerae, Biotype E1 Tor, Serotype Inaba In Seafoods., Arthur Hinton Jr Jan 1983

Survival Of Vibrio Cholerae, Biotype E1 Tor, Serotype Inaba In Seafoods., Arthur Hinton Jr

LSU Historical Dissertations and Theses

The D values of Vibrio cholerae in oyster and shrimp meat homogenate were determined at 49(DEGREES), 54(DEGREES), 60(DEGREES), 66(DEGREES), 71(DEGREES), 77(DEGREES), and 82(DEGREES)C. In oyster homogenates, the D values in minutes were 4.7 at 49(DEGREES)C, < 0.35 at 54(DEGREES)C, < 0.35 at 60(DEGREES)C, < 0.33 at 66(DEGREES)C, < 0.30 at 71(DEGREES)C, < 0.29 at 77(DEGREES)C, and < 0.24 at 82(DEGREES)C. In shrimp homogenates, the D values in minutes were 9.17 at 49(DEGREES)C, < 0.43 at 54(DEGREES)C, < 0.39 at 60(DEGREES)C, < 0.32 at 66(DEGREES)C, < 0.31 at 71(DEGREES)C, < 0.30 at 77(DEGREES), and < 0.28 at 82(DEGREES)C. Whole oysters, inoculated with 10('6) V. cholerae/gram, were cooked in boiling water (100(DEGREES)C) or in hot oil (191(DEGREES)C) for one minute. Whole shrimp, inoculated with 10('6) V. cholerae were cooked in boiling water (100(DEGREES)C) or in steam (100(DEGREES)C) for 10 minutes. Vibrio cholerae was not isolated from the cooked oysters or shrimp. Sterile and unsterile shrimp, oyster, crab, and crayfish meat homogenates were inoculated with 10('7) V. cholerae/g. The homogenates were treated with 0, 25, 50, or 100 krad and stored at 4(DEGREES), 0(DEGREES), or -8(DEGREES)C for 21 days. No V. cholerae were isolated from any of the homogenates treated with 100 krad. Vibrio cholerae was able to survive longer in the sterile oyster, crab and crayfish homogenates stored at 4(DEGREES) and 0(DEGREES)C than in the unsterile homogenates stored at the same temperatures. The organism was able to survive longer in the unsterile shrimp homogenates stored at 4(DEGREES) and 0(DEGREES)C than in the sterile homogenates stored at the same temperature. At -8(DEGREES)C, survival time was usually longer in the unsterile seafood homogenates than in the sterile seafood homogenates stored at -8(DEGREES)C. Due to the retardation of competitive inhibition the organism was usually able to survive longer in the unsterile homogenates stored at -8(DEGREES)C than in the unsterile homogenates stored at 4(DEGREES) or 0(DEGREES)C.

Go to article

Equine Infectious Anemia Virus: (1) The Generation Of Virus Variant Candidates. (2) Attempts To Titrate The Virus By Three Different Methods., Alberto Orrego Uribe Jan 1983

Equine Infectious Anemia Virus: (1) The Generation Of Virus Variant Candidates. (2) Attempts To Titrate The Virus By Three Different Methods., Alberto Orrego Uribe

LSU Historical Dissertations and Theses

Six serial passages of a cell-adapted strain of EIAV were conducted in Shetland ponies. The 16 recipient ponies became agar-gel immunodiffusion test positive by 25 days after inoculation, and it was observed that the virulence of this cell-adapted strain increased through the successive passages. Clinical signs were closely monitored and recorded, and macroscopic as well as microscopic lesions of EIA were also recorded and evaluated. The effect of EIAV upon blood components was determined after several of the febrile episodes, and the effect of the immunosuppressant dexamethasone on infected ponies were also studied. EIAV was isolated in fetal equine kidney …

Go to article

Pulmonary Dynamics, Pharmacokinetics And Receptor Binding Of 3-Methylindole In Equidae., David E. Thomas Jan 1983

Pulmonary Dynamics, Pharmacokinetics And Receptor Binding Of 3-Methylindole In Equidae., David E. Thomas

LSU Historical Dissertations and Theses

The pulmonary dynamics, pharamacokinetics and receptor binding of 3-methylindole (3MI) were determined in Equidae. Changes in pulmonary dynamics for the 10 and 20 mg/kg body weight dosages of 3MI from 0 to 48 hours after dosing were determined by whole body plethysmography. Parameters for respiratory rate, minute volume, thoracic gas volume, expiratory/inspiratory time ratio, thoracic gas volume, inspiratory and expiratory flow, and expiratory airway resistance were not significantly different from the time 0 control reading. Pooled means of tidal volume increased significantly (P < 0.05) at 6, 8 and 10 hours after dosing. Significant increases (P < 0.05) in inspiratory airway resistance were observed at the 6, 10, 24 and 48 hour readings. These changes were beginning to reverse within 48 hours after dosing. The pharmacokinetics plasma-concentration profiles for 3MI (10 and 20 mg/kg) in horses were best represented by a two-compartment open model with first order absorption as determined by non-linear least squares regression analysis. Absorption of 3MI at both dosages was rapid. Determinations of the post-distribution half life, total clearance, and area-under-curve of the plasma-concentration profile suggested the presence of non-linear or dose-dependent kinetics for 3MI in horses. Analysis of the structure activity relationships of 3MI and some of its known metabolites suggest that these compounds may bind muscarinic receptors in the lung. {('3)H}-QNB (quinudidinyl benzylate) binds to membranes of rate lung, pony lung and rat brain in a manner indicating selective interaction with a muscarinic receptor. Pharmacological potencies of various muscarinic antagonists and agonists as determined by drug inhibition curves in the presence of 100uM {('3)H}-QNB resembled those observed for other tissues. 3MI and its metabolite ortho-aminoacetophenone (OAAP) were observed to have low potency for binding to muscarinic receptors. From these data, it appears that 3MI and OAAP may interact at either a peripheral site on the receptor macromolecule or affect membrane associated components of the receptor site. These interactions may be the cause of the increased level of bronchomotor tone and resulting increased airway resistance observed in horses after administration of 3MI.

Go to article

A Descriptive Evaluation Of Two Hospital Education Programs (Louisiana)., Thomas Curtis Whitesell Jan 1983

A Descriptive Evaluation Of Two Hospital Education Programs (Louisiana)., Thomas Curtis Whitesell

LSU Historical Dissertations and Theses

The purposes of this study were to develop a method of assessment of the education function for hospitals and to ascertain if there was a significant difference in the education function of two like-size hospitals. One hospital is military, U.S. Army Community Hospital located at Fort Polk, Louisiana, and the other is civilian, Baton Rouge General Hospital, located in Baton Rouge, Louisiana. These two hospitals were selected for this study because of their similarities in size, state, educational mission and, most important, because of their organization for education. Both hospital education programs are decentralized, having a staff development section and …

Go to article

The Social Strategy Implementation Process: An Exploratory Investigation., Jean Garner Stead Jan 1983

The Social Strategy Implementation Process: An Exploratory Investigation., Jean Garner Stead

LSU Historical Dissertations and Theses

The ability to formulate and implement social strategies has become increasingly important as a means for firms to manage the socio-political elements in their environments. This dissertation is an exploratory study designed to examine the internal process of corporate social strategy implementation. Specifically, the study is an in-depth, one-firm research case analysis of the implementation process in an organically structured organization. The literature is in agreement that in today's turbulent socio-political environment it is necessary for a firm to formulate and implement effective social strategies. Yet, only two previous studies (Ackerman and Murray) have examined the process of implementing social …

Go to article

A Comparison Of Sugarcane Seedling And Vegetative Shoot Reaction To Sugarcane Mosaic Virus., Abdul Awal Jan 1983

A Comparison Of Sugarcane Seedling And Vegetative Shoot Reaction To Sugarcane Mosaic Virus., Abdul Awal

LSU Historical Dissertations and Theses

Sugarcane seedlings, Saccharum (interspecific hybrids) from a susceptible by susceptible (S x S) cross, a moderately susceptible by susceptible (MS x S) cross, a susceptible by moderately susceptible (S x MS) cross, and a susceptible by resistant (S x R) cross were categorized with regard to mosaic resistance after inoculation with strains H and I of Sugar Cane Mosaic Virus (SCMV). No particular relationship was observed among the four crosses on the basis of seedling reactions to SCMV. All seedlings were planted in the field. All susceptible and resistant seedlings were further classified respectively as highly susceptible (HS), moderately susceptible …

Go to article

Behavior Of Euphorbia Heterophylla Seed Bank., Vernon B. Langston Jan 1983

Behavior Of Euphorbia Heterophylla Seed Bank., Vernon B. Langston

LSU Historical Dissertations and Theses

Short term burial of freshly harvested seed and soil disturbances in agricultural populations of wild poinsettia (Euphorbia heterophylla L.) indicated a very low carry over of seeds into the second season after dissemination. After seeds were buried at 10, 50, 100, and 200 mm in the fall; 4%, 81%, 30% and 1%, respectively, produced seedlings during the following growing season, and only 3%, 1%, < 1%, and 3% of the seeds, respectively, were viable after one year. Soil disturbances (tillage) did not affect seedling recruitment or longevity of wild poinsettia seed. Early planting dates (May 1) of soybeans required 6 weeks of weed-free maintenance to prevent serious reinfestation and subsequent yield reductions in fields with a high agronomic seed bank of wild poinsettia, whereas for late planting dates (June 10) 3 weeks of weed-free maintenance was required. No significant difference in yield was detected between one or two cultivations for either planting date.

Go to article

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.

Go to article

Polymeric Catechols., Supon Chotiwana Jan 1983

Polymeric Catechols., Supon Chotiwana

LSU Historical Dissertations and Theses

Polymeric catechols have been synthesized by two general procedures: (a) incorporation of catechol synthons into preformed polymers, or (b) synthesis and polymerization of a monomer containing a formal-protected catechol substituent. The utilization of condensation polymers containing oxy-phenylene repeat units as alternative supports to polystyrene has been evaluated. The techniques of functionalization of the polymers via chloromethylation 1,4-bis(chloromethoxy)butane were highlighted. The effects of concentration, reaction time, and types of Lewis acid catalysts on the extent of chloromethylation were studied. Incorporation of catechol synthons such as 1,3-benzodioxole, 2,2-dimethyl-1,3-benzodioxole, or o-phenylene carbonate into the polymeric matrices having oxy-1,4-phenylene backbone via the Friedel-Crafts reactions …

Go to article

The Syntheses Of The Crown Ethers Possessing 2,6-Pyridino Moieties., Hyo Won Lee Jan 1983

The Syntheses Of The Crown Ethers Possessing 2,6-Pyridino Moieties., Hyo Won Lee

LSU Historical Dissertations and Theses

In an attempt to synthesize "Type 2" nicotinic acid crown ethers with a 3-carbinol appendage group, unexpected facile etherification was encountered during the cleavage of the tetrahydropyranyl (THP) group in acidic alcoholic media. The rationale for this reaction was provided by the examination of reactions with non-cyclic model compounds, and their THP derivatives in order to isolate any effects of the crown ether bridge. The 2,6-disubstituted dialkoxy groups were found to contribute to the stabilization of the carbonium ion derived from the protonation of the 3-pyridyl carbinols. Thus, nicotinic crown ether with a 3-carbinol group was prepared with the exclusion …

Go to article

Chemical Modifications Of Condensation Polymers, Chloromethylation And Quaternization., Shih-Jen Wu Jan 1983

Chemical Modifications Of Condensation Polymers, Chloromethylation And Quaternization., Shih-Jen Wu

LSU Historical Dissertations and Theses

Chloromethyl methyl ether, 6, generated in situ by reaction of dimethoxymethane with acetyl chloride, was employed to chloromethylate condensation polymers containing oxy-1,4-phenylene repeat units, i.e. poly(oxy-2,6-dimethyl-1,4-phenylene), 3, polyarylether sulfone, 4, and acetylated phenoxy resin, 10. To minimize concomitant crosslinking, the optium reaction ratios are 20:1:0.1 for reagent 6 to polymer to SnCl(,4) catalyst. One chloromethyl group per activated aromatic ring could be introduced: the corresponding concentration of active sites were 5.8, 3.5, and 4.6 meq/g for derivatives of 3, 4, and 10, respectively. All of the derivatives were characterized by NMR, DTA, and TGA techniques. A model segment of polyarylether …

Go to article

Louisiana Agriculture Magazine, Winter 1983-1984, Lsu Agricultural Experiment Station Jan 1983

Louisiana Agriculture Magazine, Winter 1983-1984, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

Go to article

New Sesquiterpene Lactones From The Genera Calea And Berlandiera (Asteraceae) And The Fragmentation Reactions Of 1,3-Dihydroxyeudesmanolide Derivatives., Ihl Young Lee Jan 1983

New Sesquiterpene Lactones From The Genera Calea And Berlandiera (Asteraceae) And The Fragmentation Reactions Of 1,3-Dihydroxyeudesmanolide Derivatives., Ihl Young Lee

LSU Historical Dissertations and Theses

Chemical analysis of Calea ternifolia var. calyculata (syn. Calea hypoleuka, Calea salmaefolia, and Calea albida) yielded the known sesquiterpene lactone calein A (21) and the atripliciolide derivatives, 11,13-dyhydro-11(alpha),13-epoxyatripliciolide-8(beta)-O-angelate (51), 11,13-dihydro-11(alpha),13-epoxyatripliciolide-8(beta)-O-methacrylate (52), and 9(alpha)-hydroxy-11,13-dihydro-11(alpha),13-epoxyatripliciolide-8(beta)-angelate (54). In addition, three new germacranolides, 8(beta)-angeloyloxy-9(alpha)-{2-methylbutanoyloxy} ternifolin (32), 8(beta)-angeloyloxy-9-acetoxyternifolin (33) and five furanoheliangolides, 9(alpha)-acetoxyzexbrevin (36), 9(alpha)-hydroxyzexbrevin (37), 8(beta)-angeloyloxy-9(alpha)-hydroxycalyculatolide (38), 9(alpha)-hydroxy-11,13-dihydro-11(alpha),13-epoxyatripliciolide 8(beta)-O-methacrylate (55) and 15-hydroxy-11,13-dihydro-11(alpha),13-epoxyatripliciolide (56) were isolated. The structures of the new compounds were elucidated by NMR and mass spectral methods. Single crystal X-ray diffraction of the lactones 36 and 55 established their molecular structure. Calea ternifolia var. ternifolia (syn. Calea liebmanii) provided the new sesquiterpene …

Go to article

Louisiana Agriculture Magazine, Fall 1982, Lsu Agricultural Experiment Station Oct 1982

Louisiana Agriculture Magazine, Fall 1982, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

Go to article

Louisiana Agriculture Magazine, Summer 1982, Lsu Agricultural Experiment Station Jul 1982

Louisiana Agriculture Magazine, Summer 1982, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

Go to article

An Analysis Of The Psycho-Social Adjustment Patterns Of The Haitian "Boat People" In New Orleans, In 1981, Elisabeth Babette Wainwright May 1982

An Analysis Of The Psycho-Social Adjustment Patterns Of The Haitian "Boat People" In New Orleans, In 1981, Elisabeth Babette Wainwright

LSU Historical Dissertations and Theses

This study was designed to analyze the psycho-social adjustment of the recent Haitian refugees in the United States. Emphasis was placed on their social, political and economic attitudes, and on relevant cultural and socio demographic characteristics. For comparative purposes the study included a sample of Haitian refugees living in the Unites States and a matched sample of Haitians living in Haiti. In-depth, face-to-face, semi-structured interviews were conducted in New Orleans, Fort Lauderdale, Miami and various provinces in Haiti. In addition, a creole translation of the Middletown Alienation Scale was administered to subjects in New Orleans and in Haiti. Findings indicate …

Go to article

Louisiana Agriculture Magazine, Spring 1982, Lsu Agricultural Experiment Station Apr 1982

Louisiana Agriculture Magazine, Spring 1982, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

Go to article

The Effect Of Two Methods Of Instruction On Parent Child Interaction., Arlene Marie Zielanis Fulton Jan 1982

The Effect Of Two Methods Of Instruction On Parent Child Interaction., Arlene Marie Zielanis Fulton

LSU Historical Dissertations and Theses

The purpose of this study was to compare two methods of instruction in the teaching of parent-child interaction skills. By comparing a highly structured method and a less structured method of instruction, data were compiled in order to determine the manner in which interaction skills could be most effectively taught to parents of three- and four-year old children. The study was conducted in six parishes within Louisiana and all subjects in the study were volunteers. The first method of instruction involved a highly structured approach which utilized video taped demonstrations, written materials, role play, group discussion, toys, and nine weekly …

Go to article

Xanthomonas Campestris Pv. Armoraciae The Causal Agent Of Xanthomonas Leaf Spot Of Crucifers (Cabbage, Louisiana)., Muhammad Machmud Jan 1982

Xanthomonas Campestris Pv. Armoraciae The Causal Agent Of Xanthomonas Leaf Spot Of Crucifers (Cabbage, Louisiana)., Muhammad Machmud

LSU Historical Dissertations and Theses

A disease herein referred to as Xanthomonas leaf spot (XLS) of crucifer caused by Xanthomonas campestris v. armoraciae (Xca) has been observed on Market Prize cabbage grown in southern Louisiana since the winter of 1977-78. XLS differs from black rot of crucifers caused by X. campestris pv. campestris (Xcc) in that no chlorosis is associated with the lesions, the pathogen invades stomata but fails to move systemically, and the disease develops at temperatures well below those favorable for black rot development. Inoculation of field-grown cabbage, cauliflower, and broccoli with Xca showed that these crops are susceptible and that disease severity …

Go to article

Structural Interaction Between Nitrogenase And Cell Membrane In Free-Living, Nitrogen-Fixing Bacteria (Rhodopseudomonas, Viridis, Azotobacter, Vinelandii, Rhodospirillum, Rubrum)., Karen Smith Howard Jan 1982

Structural Interaction Between Nitrogenase And Cell Membrane In Free-Living, Nitrogen-Fixing Bacteria (Rhodopseudomonas, Viridis, Azotobacter, Vinelandii, Rhodospirillum, Rubrum)., Karen Smith Howard

LSU Historical Dissertations and Theses

Rhodopseudomonas viridis grows by means of nitrogen fixation under anaerobic, photosynthetic conditions. In batch culture, nitrogenase activity was highest at early-logarithmic phase, lower during mid- to late-logarithmic phase, and nearly zero during stationary phase. Nitrogen-fixing cells were morphologically and ultrastructurally similar to non-nitrogen-fixing cells as determined by electron microscopy. Electron spin resonance (esr) spectroscopy of nitrogen-fixing whole cells yielded g4.26 and g3.66 signals indicating the presence of nitrogenase molybdenum-iron (MoFe) protein. Ammonia switch-off occurred upon addition of 0.2 mM NH(,4)Cl, however, nitrogenase activity did not reappear for nearly four hours. Esr spectroscopy of whole cell multilayers (WCM) of Azotobacter vinelandii …

Go to article

Assessment Of Raw Milk Microbiological Quality By Adenosine-5'-Triphosphate Content And Preliminary Incubation Bacterial Count., Jeffrey J. Ryan Jan 1982

Assessment Of Raw Milk Microbiological Quality By Adenosine-5'-Triphosphate Content And Preliminary Incubation Bacterial Count., Jeffrey J. Ryan

LSU Historical Dissertations and Theses

Two hundred raw milk samples were collected and stored in sanitized plastic containers which were transported in ice to the laboratory. Three 100 ml sub-samples were aseptically removed from each container. One sub-sample (Fresh) was analyzed for Standard Plate Count (SPC) and adenosine-5'-triphosphate (ATP) content. The two remaining sub-samples underwent preliminary incubation; one sub-sample was incubated at 12.8(DEGREES)C for 18 h (PI 12.8) and the other at 7.2(DEGREES)C for 48 h (PI 7.2). Following incubation, SPC and ATP content were determined. Correlation of ATP content with SPC-Fresh, SPC-PI 12.8 and SPC-PI 7.2 was 0.72, 0.84 and 0.89 with log(,10) transformed …

Go to article

Correlative Field And Laboratory Microcosm Approaches In Ascertaining Xenobiotic Effect And Fate In Diverse Aquatic Microenvironments., Ralph Joseph Portier Jan 1982

Correlative Field And Laboratory Microcosm Approaches In Ascertaining Xenobiotic Effect And Fate In Diverse Aquatic Microenvironments., Ralph Joseph Portier

LSU Historical Dissertations and Theses

The impact of a multitude of toxic chemicals, or xenobiotics, on diverse aquatic environments and the need to consider such factors in adjacent land use and disposal situations has necessitated the development of usable analytical predictive approaches. A microbial and enzymatic assessment protocol for determining the environmental effect and fate of these manufactured chemicals in coastal wetlands was devised. The protocol combined in situ analyses of interrelated soil/sediment microenvironments with statistical and analytical laboratory microcosm approaches in presenting valid predictive models of xenobiotic fate and effect. The general objective of this combined field/laboratory analysis was to provide a better understanding …

Go to article

First Prev Next Last