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Early Fertilization Events In The Freshwater Zebra Mussel, Dreissena Polymorpha., Michael James Misamore Jan 1998

Early Fertilization Events In The Freshwater Zebra Mussel, Dreissena Polymorpha., Michael James Misamore

LSU Historical Dissertations and Theses

The morphological and functional mechanisms involved in the early fertilization events in the freshwater zebra mussel Dreissena polymorpha (Bivalvia:Veneroida:Dreissenidae) are presented. Mature adults release gametes in response to external applications of 5-hydroxytryptamine. Sperm retain a primitive morphology consisting of a head, midpiece and tail The head is approximately 1.6 $\mu$m in diameter and 4 $\mu$m in length. An acrosomal vesicle is highly compartmentalized with a central axial core containing actin. The midpiece is composed of 4 mitochondria and a pair of centrioles. A single flagellum is elaborated from the distal centriole. The eggs of D. polymorpha are 50-60 $\mu$m in …

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"To Play With Fixities And Definites": Byron's Fanciful Real World Games In "Don Juan"., Nancy Clark Victory Jan 1998

"To Play With Fixities And Definites": Byron's Fanciful Real World Games In "Don Juan"., Nancy Clark Victory

LSU Historical Dissertations and Theses

In his "epic" retelling of the Don Juan tale, Byron playfully transforms his conventional sources into a poem which explores, among other subjects, Byron's poetics. Of the many love relationships in Don Juan, Juan and Haidee's represents not only ideal love, but also a startlingly Romantic expression of poetic activity. The lovers' transformation of the elements of their heretofore hostile world into a natural playworld is accomplished by a fourth variety of Romantic imagination, a Byronic Fancy which surpasses the mechanical nature of Coleridge's "Fancy." Operating in a manner strikingly similar to Coleridge's "secondary Imagination," Byron's poetic faculty also "dissolves, …

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The Psychometric Characteristics Of The Adhd Rating Scale-Iv., George Walter Hebert Jan 1998

The Psychometric Characteristics Of The Adhd Rating Scale-Iv., George Walter Hebert

LSU Historical Dissertations and Theses

The ADHD Rating Scale-IV is a screening instrument designed to assess attention-deficit/hyperactivity disorder in children. It is comprised of 18 items and has both a home and school version for parents and teachers to complete, respectively. A sample consisting of 178 parent-teacher dyads of children aged 6-12 years of age participated in the study. Psychometric investigation of these scales revealed high internal consistency, adequate test-retest reliability, and appropriate correlations with other measures of ADHD. Principal components factor analysis revealed two factors for both scales: (1) Inattention-hyperactivity and (2) Impulsivity-hyperactivity. Discriminant function analyses and base rate analyses revealed that these scales …

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Cerebral Hemoglobin Oxygen Saturation In Patients With Restless Legs Syndrome And Periodic Limb Movements In Sleep., Mark Jude Hurry Jan 1998

Cerebral Hemoglobin Oxygen Saturation In Patients With Restless Legs Syndrome And Periodic Limb Movements In Sleep., Mark Jude Hurry

LSU Historical Dissertations and Theses

Pathogenic theories of Restless Legs Syndrome (RLS) and Periodic Limb Movements in Sleep (PLMS) were reviewed and critiqued, and a new theory for the pathogenesis of RLS and PLMS was presented. It was proposed that both disorders are caused by sleep-related hypoperfusion in the area of the cerebral cortex that mediates sensation and movement in the legs. The hypoperfusion was proposed to be caused by high amplitude oscillations in total cerebral blood flow known as B-waves and by flow-reducing turbulence at several of the bifurcations in the anterior cerebral artery. This theory was tested by using near infrared spectroscopy (NIRS) …

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Biological And Molecular Properties Of Potyviruses Isolated From Sweet Potato., Eliezer Rodrigues De Souto Jan 1998

Biological And Molecular Properties Of Potyviruses Isolated From Sweet Potato., Eliezer Rodrigues De Souto

LSU Historical Dissertations and Theses

Ten potyvirus isolates from sweet potato (Ipomoea batatas) cv. Beauregard showing russet crack symptoms and three other isolates associated with internal cork and feathery mottle symptoms were obtained from commercial fields in the United States. The biological properties of these isolates and those of a mechanically transmitted virus obtained from I. purpurea were compared with a previously characterized sweet potato feathery mottle virus strain (SPFMV-C) from North Carolina. The symptoms induced in a range of hosts indicated that two of the isolates were associated with russet crack symptoms in the cultivar Jersey; however, none of them could be associated with …

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Quantifying Sustainability In Aquaculture Production., Rex Hall Caffey Jan 1998

Quantifying Sustainability In Aquaculture Production., Rex Hall Caffey

LSU Historical Dissertations and Theses

Despite increasing institutional focus in aquaculture, sustainability remains an amorphous and much debated concept. Little consensus has been identified on the issue beyond the general recognition that the concept should contain environmental, economic, and sociological considerations. This study addressed the specific, relevant question of whether politically diverse aquacuiture interests can collectively develop and agree on production-level goals and indicators of aquaculture sustainability. The research partitioned sustainability into its three subcategories: environmental, economic and social. This division facilitated the use of existing conventions of measurement and expression in each subcategory. Employing a modified Delphi technique, over 100 aquaculture stakeholders in the …

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Apoptosis, Pcna, And P53, In Fundulus Grandis Fish Liver After In-Vivo Exposure To Mnng And 2-Af., Uriel Blas-Machado Jan 1998

Apoptosis, Pcna, And P53, In Fundulus Grandis Fish Liver After In-Vivo Exposure To Mnng And 2-Af., Uriel Blas-Machado

LSU Historical Dissertations and Theses

Dysfunction in homeostatic mechanisms of cell death and proliferation are considered to be important in carcinogenesis. The p53 gene has been implicated in the regulation of cell death and proliferation. The host response was measured through sequential immunohistochemical (IHC) detection of apoptosis, PCNA, and p53 in livers of Fundulus grandis fish exposed to MNNG or to 2-AF, two known carcinogens. Studies performed determined the stability of MNNG in saltwater, the suitability of different fixatives on IHC detection of apoptosis, PCNA-PC10, and p53 (various clones), and frequencies of expression of apoptosis, PCNA, and p53. A total of 996 fish specimens were …

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Evaluating The Impacts Of Farmer Participation In The Wetland Reserve Program On The Louisiana Economy Using I-O, Sam, And Cge As Alternative Modeling Techniques., Williams Olubodunde Olatubi Jan 1998

Evaluating The Impacts Of Farmer Participation In The Wetland Reserve Program On The Louisiana Economy Using I-O, Sam, And Cge As Alternative Modeling Techniques., Williams Olubodunde Olatubi

LSU Historical Dissertations and Theses

In the U.S., wetlands are one of the resources that have been adversely affected by development in agriculture. In response, and in order to protect wetlands as vital environmental resource, the federal government initiated several agriculture-related environmental protection programs, such as swamp buster, the Conservation Reserve Program (CRP), and the Wetlands Reserve Program (WRP). The WRP is an incentive-based program designed to encourage farmers to reconvert appropriate cropland to wetlands through subsidy payments. Because land is withdrawn from agricultural production, regions with relatively high participation rates, such as Louisiana, could experience adverse economic impacts from the program. As of August …

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Effects Of Anesthesia And Potential Antispastic Agents In An Experimental Model Of Spasticity., Heather Colleen Mosser Jan 1998

Effects Of Anesthesia And Potential Antispastic Agents In An Experimental Model Of Spasticity., Heather Colleen Mosser

LSU Historical Dissertations and Theses

Spasticity is a common motor disorder in spinal cord injured-patients. Therapeutic agents used to treat the motor abnormalities exist but are often unsatisfactory. Tests of potential pharmacotherapies are routinely conducted in anesthetized intact or acutely spinal animals, conditions which do not accurately simulate the human situation. The purpose of this dissertation was to develop, validate and use the chronic spinal rat as a model of spasticity that closely approximates the human spastic syndrome to evaluate antispastic agents. The main goals of this research project were to: (1) demonstrate the development of spasticity in the chronic spinal rat; (2) determine effects …

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An Investigation Of Worry And Its Relationship To Anxiety In A Non-Clinical Sample Of Adolescents., Denise Adair Powers Jan 1998

An Investigation Of Worry And Its Relationship To Anxiety In A Non-Clinical Sample Of Adolescents., Denise Adair Powers

LSU Historical Dissertations and Theses

The overall purpose of this study was to examine the relationship between worry and anxiety in a community sample of adolescents. As no psychometrically sound instruments for measuring parameters of worry in adolescents exist, the first purpose of this study was to devise a reliable and valid measure of worry for this population. The Worry Inventory for Adolescents (WIA) was administered to 606 adolescents between the ages of 11 and 18. Based on the factor analysis, the WIA was divided into twelve factors and yielded two scores, Number of Worries and Worry Severity. The WIA demonstrated good internal consistency, moderate …

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Prevention Of Hydrolytic And Oxidative Rancidity And Nutrient Losses In Rice Bran During Storage., Fatemeh Malekian Ramezanzadeh Jan 1998

Prevention Of Hydrolytic And Oxidative Rancidity And Nutrient Losses In Rice Bran During Storage., Fatemeh Malekian Ramezanzadeh

LSU Historical Dissertations and Theses

Freshly milled raw rice bran was stabilized with microwave heat for 3 min. Half of raw and treated bran were packed in Ziplock(c) bags and the other half vacuum packed. Half of the samples were stored at 4--5°C and the other half at 25°C for 16 weeks. The free fatty acid (FFA) content increased rapidly in raw rice bran samples vacuum packed and samples packed in Ziplock(c) bags store at 25°C from an initial amount of 2.5% to 54.3% and 48.1%, respectively. FFA level increased significantly in raw samples vacuum packed and packed in Ziplock (c) bags stored 4--5°C from …

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The Portrait Of A Psyche: Women's Underworld Journeys In Four Modern American Novels., Kristen Sifert Jan 1998

The Portrait Of A Psyche: Women's Underworld Journeys In Four Modern American Novels., Kristen Sifert

LSU Historical Dissertations and Theses

Drawing from James Hillman's psychological reading of myth, this study traces the emergence of the ancient myth of Psyche in Henry James's The Portrait of a Lady, Caroline Gordon's The Women on the Porch, William Faulkner's Light in August, and Toni Morrison's Beloved. From the perspective of modern divisions, the novelists look forward to the wholeness of Psyche's reunion with Eros and the assumption of the mortal woman, yet their immediate focus is the transformative journey through the underworld. James elaborates the mythical impact of money; like the coins Psyche pays Charon, who detaches her from a sense of her …

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Significance Of The Effect Of Nitrogen Application On The Engineered Bioremediation Of Crude Oil In A Salt Marsh., Paul Timothy Tate Jan 1998

Significance Of The Effect Of Nitrogen Application On The Engineered Bioremediation Of Crude Oil In A Salt Marsh., Paul Timothy Tate

LSU Historical Dissertations and Theses

The biodegradation of the crude oil in a salt marsh was monitored by tracking the decline of the ratio of various components in the crude oil to a stable marker, hopane. In studies of mesocosms, addition of nitrogen as ammonium nitrate resulted in more rapid biodegradation of the oil at 0.10 significance. In field plots, addition of nitrogen was found to not significantly increase the rate of oil degradation over the rate in the control plots. The degradation of the oil is best described by a first order decay equation. The kinetic rate parameter k was 0.0054/day in the control …

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Association Of Environmental And Climatic Factors In The Epidemiology Of American Visceral Leishmaniasis In Northeast Brazil Using Remote Sensing And Geographical Information System Methods., Roland Alexander Thompson Jan 1998

Association Of Environmental And Climatic Factors In The Epidemiology Of American Visceral Leishmaniasis In Northeast Brazil Using Remote Sensing And Geographical Information System Methods., Roland Alexander Thompson

LSU Historical Dissertations and Theses

This study associated climatic and environmental factors with the incidence of visceral leishmaniasis (calazar) in Northeast Brazil. Remote sensing (RS) techniques permitted evaluation of spatial and temporal landscape features to stratify the region and define the target population for this vector-borne disease. The Municipality of Caninde, Ceara, Brazil was divided into 873-- 2 x 2 km2 squares centered on coordinates from a Universal Transverse Mercator projection (scale 1:100,000, 1994) and geo-referenced with 2 Landsat T.M. (TM) scenes (September 26, 1976 and July 2, 1996). The assignment of squares into foothills, plains or city strata was based on vegetative categories determined …

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Hematite And Calcite Coatings On Fossil Vertebrates, B. A.O. Huiming, Paul L. Koch, Robert P. Hepple Jan 1998

Hematite And Calcite Coatings On Fossil Vertebrates, B. A.O. Huiming, Paul L. Koch, Robert P. Hepple

Faculty Publications

Hematite coatings are common on vertebrate fossils from Paleocene/Eocene paleosol deposits in the Bighorn Basin, Wyoming. In general, hematite coatings are found only on fossils and are limited to soils exhibiting hydromorphic features and moderate maturity. Pétrographie and isotopic evidence suggests that hematite and micritic calcite formed at nearly the same time in a pedogenic environment, whereas sparry calcite formed later at greater burial depths. The parent material of paleosols is rich in iron, supplying an ample source of iron for hematite formation. Decomposition of animal tissues around bones may enhance the weathering of iron-bearing minerals in soils surrounding carcasses, …

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Reproductive Isolation Between Two Species Of Topminnow, Fundulus Olivaceus And F. Euryzonus., Thomas Allen Blanchard Jan 1998

Reproductive Isolation Between Two Species Of Topminnow, Fundulus Olivaceus And F. Euryzonus., Thomas Allen Blanchard

LSU Historical Dissertations and Theses

Fundulus olivaceus and F. euryzonus are sister species that commonly occur syntopically in the Amite and Tangipahoa River drainages in Louisiana and Mississippi. Although the habitats of the two species are quite similar, and the timing of their reproductive activity overlaps extensively, no natural hybrids between them have been documented. I examined physiological, as well as behavioral, factors that could potentially serve as effective isolating mechanisms between them. The courtship and spawning behaviors of the two species were relatively generalized and showed a number of similarities. Under forced mating conditions in which females were allowed to associate with heterospecific males …

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Characterization And Utilization Of Flavors From Undersized Crawfish., Feng Chen Jan 1998

Characterization And Utilization Of Flavors From Undersized Crawfish., Feng Chen

LSU Historical Dissertations and Theses

Undersized processed crawfish are proposed to be a resource for effective recovery of crawfish flavors. Tail puree from undersized crawfish was hydrolyzed using protease APL-440 through response surface methodology to enrich flavor production. Optimal hydrolytic conditions were determined to be pH $8{\sim}9,\ 65\sp\circ$C, 0.3% (V/W) enzyme/substrate ratio with the reaction maintained at 33.3% puree concentration over 60 min period. Effects of storage time and extraction method on the crawfish flavor profile were evaluated. Shorter storage time gave superior flavor stocks with less oxidized flavors. The shelf-life of frozen crawfish puree was at least six months. Atmospheric simultaneous distillation-solvent extraction (A-SDE) …

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Pliocene And Pleistocene Marine Ostracoda Of The Limon Basin, Costa Rica: A Record Of Paleoenvironmental Change., Pamela Frances Borne Jan 1998

Pliocene And Pleistocene Marine Ostracoda Of The Limon Basin, Costa Rica: A Record Of Paleoenvironmental Change., Pamela Frances Borne

LSU Historical Dissertations and Theses

Late Pliocene (3.8-3.6 Ma) and early Pleistocene (1.5-0.9 Ma) marine ostracodes of the Rio Banano, Quebrada Chocolate and Moin Formations (Limon Group) provide a detailed paleoenvironmental record for the Limon Basin, Costa Rica. The marine ostracode assemblages recovered from the Limon region do not provide evidence that the tropics cooled dramatically during the late Pliocene when the Northern Hemisphere was entering the Modern Ice Age. Paleoenvironmental interpretations are based on cluster analyses and a modern tropical ostracode analog analysis. Diverse ostracode assemblages of the middle Pliocene Rio Banano Formation are dominated by genera typical of the inner to middle neritic …

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An Analytical Approach To A Tree-Farm Wetland Study., Robert Cunninghame Davidge Jan 1998

An Analytical Approach To A Tree-Farm Wetland Study., Robert Cunninghame Davidge

LSU Historical Dissertations and Theses

Wetland delineation is important because federal and local government regulations limit permissible uses of wetlands. Federal delineation regulations are based upon the use of a manual jointly agreed upon by EPA, USACOE, and NRCS. The manual provides for classification of land as either wetland or non-wetland based upon the 3 criteria of soil, vegetation, and hydrology. No provision is made for gradation between categorical wetland and categorical non-wetland. Controversy has sometimes developed between landowners and environmentalists as to proper wetland classification; some delineations have been considered arbitrary. The analytical method of wetland appraisal provides a means of assigning continuous numerical …

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Physical And Chemical Properties Of Fibers Extracted From Sugarcane And Kenaf Rind., Simona Cristina Romanoschi Jan 1998

Physical And Chemical Properties Of Fibers Extracted From Sugarcane And Kenaf Rind., Simona Cristina Romanoschi

LSU Historical Dissertations and Theses

Sugar cane fibers were extracted from the rind of cane stalks with sodium hydroxide (NaOH) solutions of different concentrations, at atmospheric pressure, followed by a steam explosion. The extraction process was optimized using a central rotatable composite design, to study the influence of three reaction parameters (alkaline concentration, time of reaction and frequency of tumbling) on fiber bundle properties (weight, length, and tex). Tex was the objective function, with length as a constraint. Regression analysis indicated a quadratic polynomial response. Bleaching studies were conducted on sugar cane fibers extracted with 1.0N NaOH and on kenaf fibers mechanically processed only. Hydrogen …

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Rapid Assessment Of The Bacteriological Quality Of Milk By The Use Of Adenosine Triphosphate Bioluminescence., Pushpa John Samkutty Jan 1998

Rapid Assessment Of The Bacteriological Quality Of Milk By The Use Of Adenosine Triphosphate Bioluminescence., Pushpa John Samkutty

LSU Historical Dissertations and Theses

Raw milk samples (n = 246) and pasteurized milk samples (n = 104) were analyzed to determine adenosine triphosphate (ATP) and compared with the standard plate count (SPC). An ATP filtration method was used to filter milk samples prior to ATP determination, which was measured in relative light units (RLU). The ATP assay took approximately 7 minutes to complete and could allow rapid prediction of SPC which is a measure of raw milk quality. Linear regression analysis was performed on data from three raw milk treatments defined as; fresh milk samples, samples preliminarily incubated at 12.8 and 15.6$\sp\circ$C for 18 …

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Mating System Differences And Genetic Effects For Preweaning Traits In Beef Cattle In The Gulf Coast Region Of The United States., Dian Allison Williams Jan 1998

Mating System Differences And Genetic Effects For Preweaning Traits In Beef Cattle In The Gulf Coast Region Of The United States., Dian Allison Williams

LSU Historical Dissertations and Theses

Preweaning data collected on 1,180 calves in generation five of a crossbreeding project were analysed. The systems involved were first-cross (F$\sb1$, three-breed terminal, two-, three-, and four-breed rotational and rotational-terminal. Angus (A), Brahman (B), Charolais (C), and Hereford (H) breeds were used in the F$\sb1$ and rotational phases, while Gelbvieh (G) and Simmental (S) were the terminal sire breeds. The traits studied were birth weight (BWT), preweaning gain (ADG), 205 d weight (WWT), and weaning height (WHT). Least squares analysis of variance procedures were used for comparisons of mating systems for all traits. Estimates of direct and maternal additive (Ig, …

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Cloning And Identification Of Chlamydomonas Reinhardtii Genes And Proteins Upregulated Under Low Carbon Dioxide Conditions., Aravind Somanchi Jan 1998

Cloning And Identification Of Chlamydomonas Reinhardtii Genes And Proteins Upregulated Under Low Carbon Dioxide Conditions., Aravind Somanchi

LSU Historical Dissertations and Theses

A mechanism that concentrates CO$\sb2$ in cells of Chlamydomonas reinhardtii, is induced when cells are grown at low CO$\sb2$ conditions. This mechanism increases the CO$\sb2$ concentration at the site of RuBisCO, and thereby improves the efficiency of C$\rm\sb{i}$ uptake and fixation. Cells adapting to low CO$\sb2$ show significant physiological changes. Few of the genes encoding proteins needed to produce these changes have been identified. A cDNA library has been constructed from C. reinhardtii to identify genes involved in these changes. The cloning and identification of several cDNAs that are upregulated under low CO$\sb2$ conditions are reported here. The possible roles …

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Dynamics And Management Of Insecticide Resistance In The Horn Fly, Haematobia Irritans Irritans (L.) (Diptera: Muscidae)., Antonio Thadeu Medeiros De Barros Jan 1998

Dynamics And Management Of Insecticide Resistance In The Horn Fly, Haematobia Irritans Irritans (L.) (Diptera: Muscidae)., Antonio Thadeu Medeiros De Barros

LSU Historical Dissertations and Theses

Studies on resistance of the horn fly, Haematobia irritans irritans (L.), to insecticides were conducted in Louisiana from 1989 to 1998. These studies included monitoring resistance and resistance dynamics under different strategies of insecticide use, monitoring the efficacy of insecticide products, establishing a relationship between bioassay findings and product efficacy, and evaluation of a new insecticide class. In four years (1989--1992), efficacy of 20% diazinon-impregnated car tags used yearly was reduced from greater than twenty to just one week of control, and tag failure was observed with resistance ratios (RR) from 1.8 to 5.7. Diazinon resistance developed more slowly and …

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An Exploratory Study Of The Impact Of Hypermedia-Based Approach And Science-In-Fiction Approach For Instruction On The Polymerase Chain Reaction., Lynda A. Britton Jan 1998

An Exploratory Study Of The Impact Of Hypermedia-Based Approach And Science-In-Fiction Approach For Instruction On The Polymerase Chain Reaction., Lynda A. Britton

LSU Historical Dissertations and Theses

Exploration of meaningful learning of the polymerase chain reaction (PCR) followed instruction by a researcher-developed hypermedia computer program that incorporated human constructivist principles and a "science-in-fiction" chapter of a novel that described PCR. Human constructivism is the Ausubel-Novak-Gowin (1997) meaningful learning theory that supports science learning through graphic representations and multiple examples. Science-in-fiction is a new genre of fiction introduced by the prominent scientist, Carl Djerassi, to engender an appreciation for science, and its ethical dilemmas. Chapter 19 of Djerassi's 1994 novel, The Bourbaki Gambit, was placed into hypermedia format to standardize the presentation. As part of a clinical microbiology …

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Purification Of Porphobilinogen Deaminase And The Sequencing And Expression Of Thehemc Gene Of Rhodobacter Capsulatus., Keith A. Canada Jan 1998

Purification Of Porphobilinogen Deaminase And The Sequencing And Expression Of Thehemc Gene Of Rhodobacter Capsulatus., Keith A. Canada

LSU Historical Dissertations and Theses

Rhodobacter capsulatus uses the common tetrapyrrole pathway to synthesize heme, bacteriochlorophyll, siroheme and vitamin B-12. As part of our studies on the regulation of this pathway, the product of the hemC gene, porphobilinogen deaminase was purified approximately 200-fold. The molecular weight, isoelectric point, pH optimum and Km of the enzyme were all similar to other porphobilinogen deaminases. The stoichiometry of the enzyme was found not to be the expected four porphobilinogens used per one uroporphyrin formed. Rather a 9:1 ratio was typically seen. Further study of this atypical ratio uncovered evidence of possible in vivo regulation of porphobilinogen deaminase dependant …

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Using Scaffolded Interaction To Improve Lld Readers' Inferencing And Narrative Abilities., Kathryn Patrice Dekemel Jan 1998

Using Scaffolded Interaction To Improve Lld Readers' Inferencing And Narrative Abilities., Kathryn Patrice Dekemel

LSU Historical Dissertations and Theses

A time series control group study was completed to investigate the efficacy of Communicative Reading Strategies (CRS) as an instructional approach for improving the oral reading, question answering, and narrative retelling abilities of LLD students. The participants were 10 LLD students who ranged in age from 9 to 12 years and 5 reading-age matched (RAM) peers who ranged in age from 7 to 9 years. Five of the LLD subjects were randomly assigned to a treatment group (TLD), while the remaining 5 LLD subjects were assigned to a no-treatment group (NLD). All three groups participated in a series of probes …

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A Review Of The North American Squalodontidae (Mammalia, Cetacea)., Alton Cline Dooley Jr Jan 1998

A Review Of The North American Squalodontidae (Mammalia, Cetacea)., Alton Cline Dooley Jr

LSU Historical Dissertations and Theses

All available North American specimens of squalodont whales were examined to determine species assignments, and to determine functional aspects and ecological implications. Only two existing species of the 17 referred to Squalodontidae from North America are members of that family, Squalodon atlanticus and Squalodon calvertensis. Of these two species, only S. calvertensis is based on adequate material for consideration as a valid species. Squalodon calvertensis is redescribed, based on the material which has been collected since 1923. These specimens indicate that the species is found from New Jersey to North Carolina, in the Miocene Kirkwood, Calvert, and Pungo River Formations. …

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Materials Fluxes Across Different Scales Of Time And Space In The Rhone Delta, France., Philippe Francois Hensel Jan 1998

Materials Fluxes Across Different Scales Of Time And Space In The Rhone Delta, France., Philippe Francois Hensel

LSU Historical Dissertations and Theses

A study of materials fluxes across different scales of time and space was conducted in the Rhone Delta, France, to test the applicability of a conceptual model of deltaic ecosystem function in a scenario of accelerated sea-level rise to a mediterranean delta which has been heavily altered by human activities. Natural pulsing events such as tides, river floods and storms cause sediment surfaces to maintain elevation in the face of relative sea level rise through the process of soil formation. These pulses also enhance ecosystem function through habitat creation, food production, materials transformation, water quality and storm and flood protection. …

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Biology And Ecology Of The Anopheles Quadrimaculatus Sibling Species Complex In Louisiana., Cynthia Roxanne Rutledge Jan 1998

Biology And Ecology Of The Anopheles Quadrimaculatus Sibling Species Complex In Louisiana., Cynthia Roxanne Rutledge

LSU Historical Dissertations and Theses

A polymerase chain reaction method for identifying individuals in the Anopheles quadrimaculatus Say sibling species complex was validated for wild mosquitoes from Louisiana and Mississippi. This method distinguished An. quadrimaculatus species A, B, C, and D by detecting species-specific differences in the 2nd internal transcribed spacer of ribosomal DNA and was 100% specific and 95% sensitive. A polymerase chain reaction assay that detects differences in the second internal transcribed spacer of ribosomal DNA was tested for its usefulness in identifying all immature stages of two representatives in the An. quadrimaculatus sibling species complex. The technique was successful in amplifying DNA …

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