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 7081 - 7110 of 8029

Full-Text Articles in Entire DC Network

Structural And Functional Studies Of Carbohydrates., Shirish Trymbak Dhume Jan 1991

Structural And Functional Studies Of Carbohydrates., Shirish Trymbak Dhume

LSU Historical Dissertations and Theses

Plasmodium falciparum is the parasite responsible for a major loss of human life due to malaria. The biochemistry of invasion of the parasite into human red cells is the subject of much study and controversy. The receptor mediated endocytosis of the parasite into the red cells is postulated to involve at least two major receptors on the cells. Earlier work focussed on glycophorin of red cells as a likely receptor. The present study focussed on the role of erythroglycan, the N-linked carbohydrate chain of band 3 of human red cells in the invasion process. Erythroglycan showed high levels of inhibition …

Go to article

Specific Cell Adhesion And Its Application In Mixed Culture Fermentations., Yeou-Fu Hwang Jan 1991

Specific Cell Adhesion And Its Application In Mixed Culture Fermentations., Yeou-Fu Hwang

LSU Historical Dissertations and Theses

Cell adhesion mediated by bonds between receptors in the cell membrane and ligands on a solid support is referred to as specific cell adhesion. This work focused on the application of specific cell adhesion in control of mixed culture fermentations and on the development of solution methods of mathematical models for cell adhesion. Through various experimental techniques, a model two-strain mixed culture system was obtained. This system was used to explore the possibility of mixed culture control through selective adhesion of particular subpopulations. It was found that through a proper reactor design and operating procedure, the coexistence of the mixed …

Go to article

Biological Treatment Of Hazardous Waste Sludges In Suspended Growth Systems For Removal Of Benzo(A)Pyrene And Other Polynuclear Aromatics., Robert E. Marks Jan 1991

Biological Treatment Of Hazardous Waste Sludges In Suspended Growth Systems For Removal Of Benzo(A)Pyrene And Other Polynuclear Aromatics., Robert E. Marks

LSU Historical Dissertations and Theses

The scope of this research project was to develop a bioremediation process for accelerated oxidation of bioresistant hazardous waste sludges in continuous flow sludge reactors. Benzo(a)pyrene (BaP) was selected as the target compound due its strong bioresistance, highly carcinogenic nature, extremely low aqueous solubility, and extremely low allowable release limits for land disposal. BaP is often a major hazardous organic component in many hazardous waste impoundments when source wastes have originated from either petroleum refining or associated petrochemical facilities. There is evidence that the biodegradation rate of high molecular weight polynuclear aromatic hydrocarbons (PNA's) is the rate limiting step in …

Go to article

Modeling The Effect Of Shale Heterogeneities On Hazardous Waste Transport In Deep Well Disposal Systems., Seung-Whee Rhee Jan 1991

Modeling The Effect Of Shale Heterogeneities On Hazardous Waste Transport In Deep Well Disposal Systems., Seung-Whee Rhee

LSU Historical Dissertations and Theses

The transport of hazardous wastes in heterogeneous confining layers was evaluated using numerical simulations. The expected configuration of the confining layers was defined by Monte Carlo techniques assuming a binary random structure composed of pure sand and pure shale zones. Flow and solute transport in the generated configuration was determined via a finite element model. The effective permeability under saturated steady-state flow was dominated by shale permeability for higher shale fractions ($>$0.65) and by sand permeability for lower shale fraction ($<$0.4). The results agreed well with the numerical result of Desbarats (1987) and the analytical results of Dagan (1979). The effective vertical permeabilities were found to be dependent on shale size and anisotropy. Application of the techniques to a well in Jefferson Parish, Louisiana suggested that a mean advective penetration into confining layer using the injection pressure as an upper bound to the driving pressure was only 3m over 10,000 years. Transport calculations assuming a constant pressure driving force over 10,000 years suggested solute transport was controlled by hydrodynamic dispersion (dispersion + diffusion) rather than advection for higher shale fractions. Transport calculations assuming active injection for only the first 100 years suggested solute transport was controlled by diffusion for higher shale fraction. Buoyancy effects associated with salinity and temperature variations were negligible for solute transport through confining layers with a shale permeability less than 0.01 md. The results of solute transport of hazardous wastes in heterogeneous confining layers suggested that confining layers greater than 300 ft in thickness with shale fractions of greater than 0.65 and shale permeabilities of less than 0.01 md would be expected to contain injected wastes for 10,000 years.

Go to article

In Vitro Culture Of Bovine Uterine And Oviduct Epithelial Cells., John Kevin Thibodeaux Jan 1991

In Vitro Culture Of Bovine Uterine And Oviduct Epithelial Cells., John Kevin Thibodeaux

LSU Historical Dissertations and Theses

A reliable procedure was developed to harvest purified populations of bovine uterine epithelial cells from the luminal endometrium that allowed cells to be maintained in vitro for multiple subpassages. This method allowed adequate numbers of cells for in vitro culture studies to evaluate uterine secretion rates, uterine-embryo interactions and a new embryo co-culture system. In a second study, cells were isolated from the uterus and oviducts collected from cattle on day of estrus, on d 4 to 6, d 8 to 10 and d 14 to 16 of the cycle to monitor growth and development following incubation in vitro. The …

Go to article

Factors Responsible For The Differential Growth Of Brucella Abortus In Bovine Trophoblasts., Luis Ernesto Samartino Jan 1991

Factors Responsible For The Differential Growth Of Brucella Abortus In Bovine Trophoblasts., Luis Ernesto Samartino

LSU Historical Dissertations and Theses

The interactions of bovine chorionic membrane explants (CAMs) as well as three different bovine trophoblastic cell lines with Brucella abortus were evaluated. The ability of B. abortus to infect and grow within the cells of these CAMs and within these cell lines was measured. In addition, prostanoid and hormone production by the trophoblastic cells after infection with B. abortus was measured. Internalization of B. abortus within the cells of CAMs derived from placentas from both 3-month-gravid cows and 7-month-gravid cows was similar. By 24 hours post-inoculation B. abortus replication in 7-months-derived CAMs was significantly greater than the replication occurring in …

Go to article

The Molecular Basis Of Imidazolinone Herbicide Resistance In Arabidopsis Thaliana Var. Columbia., Kanagasabapathi Sathasivan Jan 1991

The Molecular Basis Of Imidazolinone Herbicide Resistance In Arabidopsis Thaliana Var. Columbia., Kanagasabapathi Sathasivan

LSU Historical Dissertations and Theses

Acetolactate synthase (ALS) is a key regulatory enzyme in the biosynthetic pathway of leucine, isoleucine, and valine. ALS is inhibited by four classes of structurally unrelated herbicides viz. sulfonylureas, imidazolinones, triazolopyrimidines, and pyrimidyl-oxy-benzoate. To understand the molecular basis of imidazolinone resistance, the ALS gene was isolated from an imazapyr-resistant mutant GH90 of Arabidopsis thaliana (Haughn and Somerville, 1990. Plant Physiol. 92:1081-1085). DNA sequence analysis of the mutant gene demonstrated a single point mutation from G to A at the 1958th nucleotide of the ALS coding sequence (Sathasivan et al., 1990. Nucl. Acids Res. 18:2188). This would result in serine to …

Go to article

Mechanism And Enhancement Of Phase Segregation In Drilling Fluids., John Marvin Griffin Jan 1991

Mechanism And Enhancement Of Phase Segregation In Drilling Fluids., John Marvin Griffin

LSU Historical Dissertations and Theses

Dewaterability of a compressible suspension can be characterized by two fundamental properties of viscoelastic networks: permeability and bulk modulus of elasticity. Time required for dewatering can be obtained from the former, while the latter can furnish the data required for predicting ultimate compaction. A method has been derived and an apparatus constructed for measurement of these two properties in a centrifugal field. The method was applied to a variety of drilling fluids and mineral suspensions. A floor-mounted laboratory centrifuge was used in this investigation. The methods developed have merit for evaluating pre-treatments prior to centrifugal dewatering. A method for quantifying …

Go to article

Partial Sequence And Characterization Of A Growth Hormone Gene Of The Red Drum (Sciaenops Ocellatus)., Carol Marie Dorworth Jan 1991

Partial Sequence And Characterization Of A Growth Hormone Gene Of The Red Drum (Sciaenops Ocellatus)., Carol Marie Dorworth

LSU Historical Dissertations and Theses

A growth hormone (GH) gene was isolated from nuclear DNA of the red drum (Sciaenops ocellatus). Synthetic oligonucleotides were synthesized based on published cDNA sequences of other perciform fishes. Polymerase chain reaction (PCR) methodology was employed to amplify a nucleotide sequence extending from the 5$\sp\prime$ end of intron I to 15 bases upstream of the 3$\sp\prime$ end of exon VI of the GH gene. Amplified DNA was cloned into a phagemid sequencing vector. Clones were sequenced. Computer analysis of sequence data was used to determine the internal gene arrangement of exons and introns. Homologies of the nucleotide and deduced amino …

Go to article

Changing Eyes: American Culture And The Photographic Image, 1918-1941., Melissa A. Mceuen Jan 1991

Changing Eyes: American Culture And The Photographic Image, 1918-1941., Melissa A. Mceuen

LSU Historical Dissertations and Theses

From 1918 to 1941, fast-paced changes and far-reaching crises occurred in all realms of American life--social, economic, political, cultural, and intellectual. Evidence of the culture's preoccupations showed up not only in written, but also in visual sources. Photographs helped to reveal the values of American culture, and did so with increasing frequency as the photographic process was further improved. Each visual image bore the marks of its culture, yet none provided a completely objective look at reality. For every picture was the product of the personality standing behind the camera. This study examines both the lives and the photographs of …

Go to article

The Rhetoric Of Community Ritual: The Blessing Of The Shrimp Fleet At Chauvin, Louisiana., Barbara Elizabeth Gordon Jan 1991

The Rhetoric Of Community Ritual: The Blessing Of The Shrimp Fleet At Chauvin, Louisiana., Barbara Elizabeth Gordon

LSU Historical Dissertations and Theses

This study examines the rhetorical functions of a community ritual, the blessing of the shrimp fleet at Chauvin, Louisiana. Chauvin is a Cajun community in south Louisiana. Their annual fleet blessing was instituted in the 1930's and continues today relatively unchanged. The author observed the preparations and performance of the blessing and boat parade and also interviewed community members about the blessing. The observations and interview transcriptions are the primary data used for analysis of the community discourse. Fantasy theme analysis is used to demonstrate the community's use of discourse to develop and maintain group hierarchy. The discourse reveals six …

Go to article

Conceptus-Derived Immunosuppressive Factors And Their Role In Fetal Allograft Protection., Terri Lynn Roth Jan 1991

Conceptus-Derived Immunosuppressive Factors And Their Role In Fetal Allograft Protection., Terri Lynn Roth

LSU Historical Dissertations and Theses

The role of conceptus-derived immunosuppressive factors in protecting the fetal allograft was investigated by first examining the immunosuppressive activity derived from ovine, caprine and hybrid conceptus trophoblast tissue. Medium conditioned by 20 day-old conceptus trophoblast tissue from each species suppressed sheep and goat lymphocyte proliferation (P $$.05) between the immunosuppressive effects of the three media on either sheep or goat lymphocytes. In subsequent studies, horse conceptus-conditioned medium (HCCM) derived from embryos at days 9, 15 and 26 of gestation, suppressed mitogen-stimulated horse lymphocytes (P $<$.001). HCCM maintained its suppressive activity following heating and repeated freeze-thawing. Using microconcentrator centrifugation, it was determined that the suppressor factor(s) was $>$100,000 MW. HCCM was tested in donkey and goat lymphocyte cultures and proved capable of …

Go to article

An Examination Of Auditor Changes Following Events Adversely Affecting External Auditor Credibility., Thomas E. Wilson Jr Jan 1991

An Examination Of Auditor Changes Following Events Adversely Affecting External Auditor Credibility., Thomas E. Wilson Jr

LSU Historical Dissertations and Theses

This study examines auditor changes following events adversely affecting auditor credibility. Disciplinary actions against auditors by the Securities and Exchange Commission (SEC) are posited to be events damaging to auditor credibility. Agency theory and prior research are used to generate hypotheses about differences between client firms that switch auditors and client firms that do not switch auditors after an SEC action under Rule 2(e) against their auditor. A series of univariate and multivariate statistical tests are conducted on the sample firms. The sample is divided into a Switch group and a Non-Switch group. The sample as a whole is examined, …

Go to article

The Rhodobacter Capsulatushema Region: Nucleotide Sequence And Functional Analysis., John Joseph Eckert Jan 1991

The Rhodobacter Capsulatushema Region: Nucleotide Sequence And Functional Analysis., John Joseph Eckert

LSU Historical Dissertations and Theses

Most of the effort to elucidate the mechanism of oxygen-mediated regulation of tetrapyrrole biosynthesis in Rhodobacter capsulatus has focused on the first step in the biosynthetic pathway, the condensation of glycine with succinyl-CoA to form $\delta$-aminolevulinic acid. This reaction, in R. capsulatus, is catalyzed by $\delta$-aminolevulinate synthase, the product of the hemA gene. In order to facilitate further study of the hemA gene and its product, its nucleotide sequence was determined. The open reading frame encoding $\delta$-aminolevulinate synthase was determined to be 1,206 base pairs, encoding a 50,491 Da polypeptide of 401 amino acids. The DNA sequence was compared with …

Go to article

Biosynthetic Studies Of Hairy Root Constituents Of The Heliantheae (Asteraceae) And Phytochemical Screening Of Members Of The Magnoliaceae., Marco Luis Gomez-Barrios Jan 1991

Biosynthetic Studies Of Hairy Root Constituents Of The Heliantheae (Asteraceae) And Phytochemical Screening Of Members Of The Magnoliaceae., Marco Luis Gomez-Barrios

LSU Historical Dissertations and Theses

The major chemical constituents of Magnolia acuminata, M. ashei, M. cordata, M. dealbata, M. fraseri, M. freemani, M. little gem, M. macrophylla, M. tripetala and M. virginiana were studied as part of a continuing search for biologically active secondary metabolites from regional plant sources and the investigation of their biosynthesis and large scale production. All these Magnolia species are rich in fatty acids and several also contain monoterpenes, sesquiterpenes, sesquiterpene lactones and lignans. The organic extract of the leaves of Magnolia virginiana provided a new sesquiterpene lactone, 4,14-dehydromagnograndiolide, and the new sesquiterpene lactol costunolactol. The known sesquiterpene lactones parthenolide and …

Go to article

Louisiana Agriculture Magazine, Fall 1990, Lsu Agricultural Experiment Station Oct 1990

Louisiana Agriculture Magazine, Fall 1990, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

Go to article

Louisiana Agriculture Magazine, Summer 1990, Lsu Agricultural Experiment Station Jul 1990

Louisiana Agriculture Magazine, Summer 1990, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

Go to article

Louisiana Agriculture Magazine, Spring 1990, Lsu Agricultural Experiment Station Apr 1990

Louisiana Agriculture Magazine, Spring 1990, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

Go to article

The Transport And Fate Of Chromium(Vi) In Deep Well Disposal Zone., Jaehyuk Hyun Jan 1990

The Transport And Fate Of Chromium(Vi) In Deep Well Disposal Zone., Jaehyuk Hyun

LSU Historical Dissertations and Theses

Several parameters affecting the behavior of Chromium(+VI) in deep well injection zones were studied. Temperature, pH, concentration of inorganic salt in wastewater, and organic chemicals co-injected with wastewater were considered as they affect the adsorption and reduction rates of Cr(VI). Water content, bulk density of shale and sand, and temperature were examined for their effect on the diffusion rate of Cr(VI) in porous media. Adsorption and reduction of Cr(VI) were investigated using three clays, Na-Montmorillonite, Illite, and Kaolinite, and sand from an injection well formation in southern Louisiana, and a confining layer shale obtained from a second Louisiana injection well. …

Go to article

Factors Involved In Immune Modulation Of Bovine Leukemia Virus Infection., Wanda V. Pool Jan 1990

Factors Involved In Immune Modulation Of Bovine Leukemia Virus Infection., Wanda V. Pool

LSU Historical Dissertations and Theses

Bovine Leukemia Virus (BLV) is an exogenous type-C retrovirus which can induce an aleukemic (AL) stage, a persistent lymphocytotic (PL) stage, or a lymphosarcomatous (LS) stage in infected animals. After experimental infection with BLV, whole blood and serum samples were obtained from 12 holstein heifers for 103 weeks and used to correlate clinical signs (visual observation and white blood cell counts) with changes in humoral immune response (Agar gel immunodiffusion using envelope gp50 as primary antigen, and ELISA and Western immunoblots using whole BLV as antigen). Monoclonal antibodies against BLV envelope gp50 and gag p24 were produced to confirm reactivity …

Go to article

A New Chloroplast Protein Is Induced By Growth On Low Co2 In Chlamydomonas Reinhardtii, Catherine B. Mason, Livingston J. Manuel, James V. Moroney Jan 1990

A New Chloroplast Protein Is Induced By Growth On Low Co2 In Chlamydomonas Reinhardtii, Catherine B. Mason, Livingston J. Manuel, James V. Moroney

Faculty Publications

The biosynthesis of a 36 kilodalton polypeptide of Chlamydomonas reinhardtii was induced by photoautotrophic growth on low CO2. Fractionation studies using the cell-wall-deficient strain of C. reinhardtii, CC-400, showed that this polypeptide was different from the low CO2-induced periplasmic carbonic anhydrase. In addition, the 36 kilodalton polypeptide was found to be localized in intact chloroplasts isolated from low CO2-adapting cultures. This protein may, in part, account for the different inorganic carbon uptake characteristics observed in chloroplasts isolated from high and low CO2-grown C. reinhardtii cells.

Go to article

The Incidence Of Vibrio Species In Louisiana And Maryland Oysters (Crassostrea Virginica)., Mary Lynelle Ford Jan 1990

The Incidence Of Vibrio Species In Louisiana And Maryland Oysters (Crassostrea Virginica)., Mary Lynelle Ford

LSU Historical Dissertations and Theses

Vibrio species, normal inhabitants of the sea and of shellfish harvested from marine or brackish waters, have been established as the causative agents of serious human infections. An investigation to isolate and identity Vibrio species in oysters collected from eight Louisiana commercial oyster beds was conducted. A selection of 127 vibrio isolates and 46 reference strains, including all known Vibrio species, were subjected to a bacteriological identification scheme of 46 parameters. When the data from the wild strains and the reference strains were analyzed by the numerical taxonomy program, TAXAN Version 3.0, six major phena were evident. Four of the …

Go to article

Synthesis And Rearrangements Of Alpha-Halosilanes; Nmr Studies Of 1,2-Bis(Trimethylsilyl)Cyclohexane., Roberto Nunez Zela Jan 1990

Synthesis And Rearrangements Of Alpha-Halosilanes; Nmr Studies Of 1,2-Bis(Trimethylsilyl)Cyclohexane., Roberto Nunez Zela

LSU Historical Dissertations and Theses

A new synthetic route for the preparation of $\alpha$-halobenzylsilanes is reported. The new route is based on carbene generation from diazirines and insertion into the silicon-hydrogen bond. Phenylhalocarbenes were generated by the thermal decomposition of 3-halo-3-phenyldiazirines. The reaction was carried out without solvent and with use of an excess of halodiazirine. This methodology is very versatile in allowing for a variety of different aryl substituents at the benzylic position in the targeted $\alpha$-halobenzylsilanes. The synthesis and rearrangement under Lewis-acid catalyzed conditions of 1-methyl-1-(dichloromethyl)silacyclopentane and 1-ethyl-1-(dichloromethyl)silacyclopentane is reported. The product is formed via two consecutive $\alpha$-halosilane rearrangements, the first of which …

Go to article

The Use Of Cell Culture Systems To Improve Bovine Embryo Viability In Vitro., Stephen Harry Pool Jan 1990

The Use Of Cell Culture Systems To Improve Bovine Embryo Viability In Vitro., Stephen Harry Pool

LSU Historical Dissertations and Theses

Growth characteristics for fetal bovine uterine fibroblast cells (FBUFC) and frozen-thawed bovine (b) and caprine (g) trophoblastic vesicles (TV) were similar in (A) Ham's F-10 (HF-10), (B) MEM (with Earle's salts), (C) RPMI-1640 and (D) Menezo's B$\sb2$ (B$\sb2$), each supplemented with 10% FCS and Ab-Am (Experiment (Exp) I). Cell numbers declined initially but increased linearly thereafter for 5 days. The bTV and gTV that survived freezing had similar viability across time and Treatments (Trt). Exp II compared the (A) bTV, (B) FBUFC monolayer and (C) bTV-monolayer co-culture systems to (D) HF-10 alone for culture of 8- to 32-cell bovine embryos. …

Go to article

Synthesis And Characterization Of Linear And Star -Branched Poly(Gamma-Stearyl-L-Glutamate)., Drew Scott Poche Jan 1990

Synthesis And Characterization Of Linear And Star -Branched Poly(Gamma-Stearyl-L-Glutamate)., Drew Scott Poche

LSU Historical Dissertations and Theses

The synthesis and characterization of linear and star branched poly($\gamma$-stearyl-L-glutamate) (PSLG) is reported. A new synthesis for N-carboxyanhydride (NCA) monomers was developed by employing bis(trichloromethyl)carbonate (triphosgene) to functionalize the corresponding $\alpha$-amino acid. Multi-functional primary amino initiators (central units) were synthesized to enable the production of three, four, six and nine arm star polymers by reaction of the central units with the desired NCA. Linear PSLG was produced by either sodium methoxide initiation or benzyl amine initiation of $\gamma$-stearyl-L-glutamate-N-carboxyanhydride (SLGNCA). The highest molecular weight polymers were produced from methoxide initiation. Other molecular weights can be produced from the same ratio of …

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

Sugarcane Pollen Viability And Seed Setting As Affected By Daylength Decline Rates And Relative Humidity., Adel Mostafa Abou-Salama Jan 1990

Sugarcane Pollen Viability And Seed Setting As Affected By Daylength Decline Rates And Relative Humidity., Adel Mostafa Abou-Salama

LSU Historical Dissertations and Theses

The effects of daylength decline rates and relative humidity levels and durations on pollen viability and seed setting of sugarcane (Saccharum spp.) were investigated. Two studies were carried out at St. Gabriel Research Station of the Louisiana Agricultural Experiment Station. Daylength decline rates of one half and one minute per day were studied on 354 crosses made within three years using 54 males and 92 females. Males treated with one half minute daylength decline rate had higher pollen viability. Seed production was not affected by the treatments. Varietal differences were found responsible for most of the variation obtained. The two …

Go to article

Characterization Of Solid Matrices For Solidification/Stabilization Of Hazardous Wastes Using Solid State Nuclear Magnetic Resonance Spectroscopy And Other Analytical Techniques., Humayoun Akhter Jan 1990

Characterization Of Solid Matrices For Solidification/Stabilization Of Hazardous Wastes Using Solid State Nuclear Magnetic Resonance Spectroscopy And Other Analytical Techniques., Humayoun Akhter

LSU Historical Dissertations and Theses

Solidification/stabilization (S/S) is a valuable technology for the treatment of certain waste streams, e.g., metal plating wastes, incinerator ashes, etc., and has great potential for use in treatment of contaminated soils. Although this technology is relatively cheap, significant questions remain about the range of its applicability. Cement chemistry is very complex and poorly understood, and the possibility that contaminants could adversely affect the durability and permeability of the matrix is very real. The broad aims of the present studies are to survey S/S binding agents and additives with respect to their abilities to immobilize As, Cr, Pb, and phenols, the …

Go to article

First Prev Next Last