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

Life Sciences Commons

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

PDF

Theses/Dissertations

1985

Discipline
Institution
Keyword
Publication

Articles 1 - 30 of 299

Full-Text Articles in Life Sciences

Development Of A Yeast Transcription System Using A Saccharomyces Cerevisiae Enzyme Extract And A Drosophila Melanogaster Histidine Trna Gene, Diana M. Parker Dec 1985

Development Of A Yeast Transcription System Using A Saccharomyces Cerevisiae Enzyme Extract And A Drosophila Melanogaster Histidine Trna Gene, Diana M. Parker

Biology Master’s Theses

This research problem is directed toward the isolation of an enzyme from the yeast Saccharomyces pombe which endonucleolytically processes the 3' terminus of transfer ribonucleic acids.

Plasmids containing tRNA genes were a gift from Dieter Soll, Yale University Department of Molecular Biophysics and Biochemistry. In order to provide increasing amounts of the cloned gene, the bacterium Escherichia coli HB101 was transformed using standard transformation procedures and methods.

The transformed bacteria were cultured, and the plasmids amplified using chloramphenicol. These bacteria were then lysed and cesium chloride-ethidium bromide gradients were run to isolate plasmids containing the desired genes.

The plasmids were ...


The Role Of The Nucleus Accumbens In The Post-Gestational Release Of Prolactin, Priscilla Thomas Dec 1985

The Role Of The Nucleus Accumbens In The Post-Gestational Release Of Prolactin, Priscilla Thomas

ETD Collection for AUC Robert W. Woodruff Library

Bilateral lesions of the nucleus accumbens (NA) in the brain of female rats before breeding have been reported to be followed by failure of lactation and cannibalism of offspring. In these studies the possibility that the NA controls release of prolactin from the pituitary gland was investigated.

Bilateral lesions were placed in the NA of virgin female rats. Improperly and/or sham lesioned rats served as controls. Following lesioning, (3-5 days), the rats were bred. After parturition (16-18 hours), blood and anterior pituitaries from each animal were collected and radioimmunoassays of plasma and anterior pituitary contents were performed. All lesions ...


The Effects Of Flurazepam Dihydrochloride On The Growth And Motility Of Tetrahymena Pyriformis As Seen By The Scanning Electron Microscope, Sonja R. Stovall Dec 1985

The Effects Of Flurazepam Dihydrochloride On The Growth And Motility Of Tetrahymena Pyriformis As Seen By The Scanning Electron Microscope, Sonja R. Stovall

ETD Collection for AUC Robert W. Woodruff Library

The purpose of this study was to analyze the effects of the drug, flurazepam dihydrocloride on the growth and motility of Tetrahymena pyriformis maintained under axenic conditions.

Growth cultures containing the drug and the organisms were cultivated at 26°C for five days, with optical readings taken at 24-hr intervals. These readings were determined by turbidity using a Spectronic 20. The organisms were examined by Scanning Electron Microscopy to determine sites of drug activity on the organisms. Results revealed that flurazepam dihydrocloride caused the inhibition of growth and motility of l· pyriformis. Scanning Electron Microscope studies revealed that the primary ...


Stable Hydrogen And Carbon Isotopic Compositions Of Biogenic Methanes, Roger Allen Burke Jr. Dec 1985

Stable Hydrogen And Carbon Isotopic Compositions Of Biogenic Methanes, Roger Allen Burke Jr.

Graduate Theses and Dissertations

Stable hydrogen and carbon isotopic compositions of biogenic methanes collected from the sediments of several deep-sea, nearshore marine-estuarine, and freshwater environments were determined. The isotopic compositions of methane samples from eight different DSDP Sites (mean σD-CH4 = -1850>/∞, std. dev. = 70>/∞, n = 75; mean σ13C-CH4 = -71.30/∞, std. dev. = 6.30/∞, n = 44) are generally typical of methane formed via C02 reduction in deep-sea sediments.

Methane collected from several freshwater environments was D-depleted (mean σD-CH4 = -3000>/∞ , std. dev. = 260/∞, n = 20) and 13C-enriched (mean σ13C-CH4 ...


A Floristic And Taxonomic Study Of The Wood-Rotting Aphyllophorales Of The Spruce-Fir Forest Of The Great Smoky Mountains National Park, Hack Sung Jung Dec 1985

A Floristic And Taxonomic Study Of The Wood-Rotting Aphyllophorales Of The Spruce-Fir Forest Of The Great Smoky Mountains National Park, Hack Sung Jung

Doctoral Dissertations

An ecological survey of the wood-rotting Aphyllophorales from the spruce-fir forest of the Great Smoky Mountains National Park was accomplished with emphasis on resupinate taxa. A total of 105 species are described within 51 genera of 6 families and discussed in terms of habitats, substrates, wood rot, host trees, elevation, and distribution. Sixteen species were successfully cultured. Analytical keys for genera and species are provided, and microscopic characters are illustrated in an appendix.

Fungi usually occur in naturally disturbed areas with windbreaks and windthrows. Fomitopsis, Ganoderma, Phellinus, and Perenniporia are the most common.decay fungi. Hirschioporus and stereoid fungi play ...


Nutrient Capital Sequestration In Pioneer Plant Communities On Surface-Mine Spoil, Gary Leon Wade Dec 1985

Nutrient Capital Sequestration In Pioneer Plant Communities On Surface-Mine Spoil, Gary Leon Wade

Doctoral Dissertations

Biomass production and nutrient capital sequestration of four pioneer plant communities on a surface-mine spoil were compared. A Chenopodium album-dominated community (Treatment 4) produced the greatest amount of biomass. Next were a community derived from a forest topsoil seed bank spread over mine spoil (Treatment 2), a seed bank community with common reclamation species seeded into it (Treat­ ment 3 ) , and a mix of grasses and Lespedeza commonly used in reclama­tion (Treatment 1).

Treatments 1, 2, and 3 sequestered N in aboveground biomass in an amount approximately equal to that added as fertilizer, but Treat­ment 4 sequestered 237 ...


A Biogeographic Study Of Amphibians In Tennessee, William H. Redmond Jr. Dec 1985

A Biogeographic Study Of Amphibians In Tennessee, William H. Redmond Jr.

Doctoral Dissertations

Range maps and descriptive, taxonomic, and habitat information are provided for 20 species of frogs and 41 species of salamanders. The environmental setting of Tennessee is described in terms of geology, physiography, climate, drainages, soils, vegetation, and ecoregions. For the purposes of the analyses, a grid cell pattern containing 122 sampling units is used, and the amphibian fauna is organized into three faunal groups. These groups are frog species, salamander species, and all species grouped together as amphibians. The results of a G-test for the frequency distribution of range limits fitted to a Poisson distribution suggest a clumped dispersion pattern ...


Seasonal Variation In Population Location Of The Galapagos Tortoise, Geochelone Elephantopus Vandenburghi, On Volcan Alcedo, Isabela Island, Galapagos Archipelago, Kent R. Beaman Dec 1985

Seasonal Variation In Population Location Of The Galapagos Tortoise, Geochelone Elephantopus Vandenburghi, On Volcan Alcedo, Isabela Island, Galapagos Archipelago, Kent R. Beaman

Loma Linda University Electronic Theses, Dissertations & Projects

Twenty tortoises, 10 adult males and 10 adult females, were tagged with radio transmitters. Numbers were painted on each carapace to aid in visual sighting. The tortoises were released, and their movement was monitored over a one year period.

The percent recovery of tagged tortoises along with the numbers of non-tagged tortoises counted in sections of the study area, were used to determine tortoise population movement and location.

Weather data were collected and observations were made concerning the vegetation. These observations were compared with those from previous studies to see what impact seasonal climatic conditions and food availability had on ...


Isolation And Characterization Of Temperature-Sensitive Protein Synthesis Mutants Of Escherichia Coli By Directed Mutagenesis Of The Defective Bacteriophage Lambda Fus2, Kenton L. Lohman Dec 1985

Isolation And Characterization Of Temperature-Sensitive Protein Synthesis Mutants Of Escherichia Coli By Directed Mutagenesis Of The Defective Bacteriophage Lambda Fus2, Kenton L. Lohman

Electronic Theses and Dissertations

Mutagenesis of the defective transducing bacteriophage lambda fus2 was used to isolate a collection of temperature-sensitive mutants of E. coli in the major ribosomal protein gene cluster. Four mutants were examined in detail. Two of the mutants were resistant to the ribosomal antibiotics neamine and spectinomycin. Another mutant was defective in 50S ribosomal subunit assembly at 42(DEGREES)C. The 30S subunit proteins S17 and S19 were changed in two different mutants. Each protein migrated as a more basic species in two-dimensional gels of ribosomal proteins. Ribosomes from each of the four mutants examined showed a temperature-dependent reduction in translational ...


Cisplatin Ototoxicity In The Guinea Pig: An Electrophysiological, Morphological, And Biochemical Study, Sarah E. Barron Dec 1985

Cisplatin Ototoxicity In The Guinea Pig: An Electrophysiological, Morphological, And Biochemical Study, Sarah E. Barron

Electronic Theses and Dissertations

The purpose of this study was to determine changes induced by cisplatin on hair cell (HC) morphology, compound action potential (CAP), Preyer reflex (PR), and Na,K-ATPase activity in the cochlear lateral wall. Guinea pigs were treated with either 0.42, 0.83, 1.17, 1.50 mg/kg cisplatin, i.p. or sterile water for 12 consecutive days and tested on day 13. HC condition was visualized with scanning electron microscopy (SEM), CAP was initiated with a 1 volt click, and Na,K-ATPase activity was measured by the method of Fiske and SubbaRow. HC damage was linear with dose ...


Microencapsulation As An Alternative To Emulsification For Preparing As A For Use In Papermaking, William J. Corriveau Dec 1985

Microencapsulation As An Alternative To Emulsification For Preparing As A For Use In Papermaking, William J. Corriveau

Master's Theses

The sizing chemical ASA is emulsified to make i t compatible with the papermaking process. Unfortunately, emulsified ASA is chemically reactive with water at the elevated temperatures found in papermaking systems. As an alternative, encapsulated ASA was made and investigated for its stability towards water at elevated temperatures.

A handsheet procedure was developed to analyze emulsified and encapsulated ASA. It was concluded that the procedure gave statistically reproducible results. Investigations with the procedure revealed important variables concerning the laboratory and m ill application of ASA. Evidence indicated that retention of ASA was critical to sizing development.

Encapsulated ASA made for ...


The Use Of Motor Coordination Endpoints In The F1 Generation To Evaluate For Effects Of Ethylmethanesulfonate On Pre- And Post-Meiotic Sperm Cells Of Male Mice, Lee Goldner Dec 1985

The Use Of Motor Coordination Endpoints In The F1 Generation To Evaluate For Effects Of Ethylmethanesulfonate On Pre- And Post-Meiotic Sperm Cells Of Male Mice, Lee Goldner

Master's Theses

Groups of 5 male HA(ICR) mice were injected intraperitoneally with 60, 150, 300, or 600 mg/kg body weight of ethylmethanesulfonate or with a saline control. Each male was mated to two untreated females at two weeks after treatment and then again at five weeks after treatment. The treatment groups were labelled post-meiotic and pre-meiotic relative to the stage of spermatogenesis at time of treatment. Progeny were evaluated by observations of litter size, body weight, negative geotactic response, swimming patterns, limb use, water escape time and open field motor coordination activity. Body weight, geotactic response, limb use and open ...


Plasma Carnitine Of The Premature Infant, Rebecca Bryan Smith Nov 1985

Plasma Carnitine Of The Premature Infant, Rebecca Bryan Smith

Masters Theses

Premature infants have been shown to exhibit fat intolerance with the administration of exogenous lipid, especially intravenous lipid. Carnitine is required for the efficient oxidation of long-chain fatty acids. Since infants have been reported to be unable to synthesize carnitine, the carnitine and lipid status was investigated in a series of premature infants throughout the entire period of hospitalization. At birth, the plasma carnitine of three groups of appropriate for gestational (AGA) premature infants (n=36), was compared with full term infants (n=10), and with maternal and umbilical cord plasma carnitine levels. The plasma concentrations of carnitine, triglyceride, and ...


An Analysis Of Mercury Accumulation Within The Upper Estuarine Food Chain Of Lake Charles, Louisiana, Jeffrey W. Tingle Nov 1985

An Analysis Of Mercury Accumulation Within The Upper Estuarine Food Chain Of Lake Charles, Louisiana, Jeffrey W. Tingle

LSU Historical Dissertations and Theses

Analysis of the level of mercury contamination within the sediments and fish associated food chain of Lake Charles, Louisiana, an area located within the Calcasieu River system, were assessed. Sediment levels were found to be slightly elevated (0.33µg Hg/g) from natural background levels (0.20 µg Hg/g). Levels found within the fish of the region were also found to be slightly elevated (0.287 µg Hg/g) from natural levels. This is below the hazardous level designated by the Food and Drug Administration (0.50 µg Hg/g). The statistical analysis of the pathway of mercury through ...


The Effects Of Stress On The Blood Calcium Level In The Male White Rat (Rattus Norvegicus), Howard Perry Cobb Aug 1985

The Effects Of Stress On The Blood Calcium Level In The Male White Rat (Rattus Norvegicus), Howard Perry Cobb

Master's Theses

THE EFFECTS OF STRESS ON THE BLOOD CALCIUM LEVEL IN THE MALE WHITE RAT (Rattus norvegicus) by Howard Perry Cobb I I I was writ ten as part of the requirements for a Master of Science degree in Biology at the University of Richmond (May, 1985). The present experiment was designed to determine whether parathyroid hormone (PTH) can be considered a "stress" hormone. Parathyroidectomized (PX) male rats (160-200 g) were injected with 10, 20, or 30 USP units of PTH per 100 g body weight and subjected to confinement/UHF stress for a 1.5-h period. Serum calcium levels of ...


An Electrophoretic Analysis Of The Genetic Relationship Between Etheostoma Nigrum And Etheostoma Olmstedi (Percidae: Etheostomatini) In The James River Drainage Of Virginia, John Stuart Prince Jr. Aug 1985

An Electrophoretic Analysis Of The Genetic Relationship Between Etheostoma Nigrum And Etheostoma Olmstedi (Percidae: Etheostomatini) In The James River Drainage Of Virginia, John Stuart Prince Jr.

Master's Theses

Etheostoma nigrum Rafinesque 1820, the Johnny darter ranges from Alabama to the Hudson Bay and from Colorado east to the Atlantic slope in the James, Roanoke, Tar and Neuse Rivers. Etheostoma olmstedi Storer 1842, the tesselated darter, is restricted to the east coast in the Atlantic and Lake Ontario drainage. In the James and Roanoke River systems in Virginia E. nigrum occupies the piedmont and montane regions whereas E. olmstedi primarily inhabits the coastal plain. The relationship between the morphologically similar species of darters (subgenus Boleosoma) is controversial and has been investigated by several authors. Stone (1947), using multiple character ...


Anatomy And Systematics Of Penthorum L., Melanie Lynn Haskins Aug 1985

Anatomy And Systematics Of Penthorum L., Melanie Lynn Haskins

Master's Theses

The genus Penthorum L. consists of two species of perennial herbs, P. sedoides of eastern North America and P. chinense of eastern Asia. Penthorum has long be.en considered intermediate between crassulaceae and Saxifragaceae. An anatomical study of both species was undertaken to contribute to a better understanding of the relationships of these plants. Prominent anatomical features of Penthorum include: an aerenchymatous cortex and closely-spaced collateral vascular bundles of stems; one-trace unilacunar nodes; brochidodromous venation, rosoid teeth bearing hydathodes, and anomocytic stomata of leaves; angular vessel elements with many-barred scalariform perforation plates and alternate to scattered intervascular pits; thin-walled non-septate ...


Atp Defendent Na+ Transport And The Characterization Of Na+ / Nh4+ Exchange In Basolateral Vesicles Of The Blue Crab, Callinectes Sapidus, Gill, Linda Ann Fuhrman Aug 1985

Atp Defendent Na+ Transport And The Characterization Of Na+ / Nh4+ Exchange In Basolateral Vesicles Of The Blue Crab, Callinectes Sapidus, Gill, Linda Ann Fuhrman

Master's Theses

ATP dependent Na+ transport was denonstrated in purified ba.solateral vesicles of the blue crab (Callinectes sapidus) gill. Active Na+ uptake was dependent upon the intravesicular presence of either K+ or NH; as a counterion. Final membrane preparations consist of inside-out basolateral vesicles, evidenced by intravesicular ouabain (1 rrM) and extravesicular vanadate (1 rnM) 22Na + uptake inhibition. Na+/NH4+exchange rates were investigated by detennining the NH; concentration in the recovered extravesicular nedium and by using the kinetic capabilities of a DU7 spectrophotareter. These purified basolateral membranes, rich in Na+,K+-ATPase activity, provide a useful in vitro ...


Knowledge And Attitudes Of Campers Toward Black Bears In Great Smoky Mountains National Park, Pamela A. Petko-Seis Aug 1985

Knowledge And Attitudes Of Campers Toward Black Bears In Great Smoky Mountains National Park, Pamela A. Petko-Seis

Masters Theses

The purpose of this study was to provide information that would be useful in the management of human-bear interactions in Great Smoky Mountains National Park (GSMNP or Park). One-hundred and fifty backcountry campers and 200 frontcountry campers were interviewed to determine their attitudes, knowledge, camping habits, and experience as related to black bears. In addition, preliminary observations of human-black bear interactions in the backcountry were documented.

Backcountry campers were younger and more educated than frontcountry campers. At least 10% of campers did not realize black bears climb trees or that they are diurnally active. Approximately 25% of campers did not ...


The Trend In Canopy Composition In A Young Mesic Forest, Zhenchang Li Aug 1985

The Trend In Canopy Composition In A Young Mesic Forest, Zhenchang Li

Master's Theses

Brewer Woods, a young disturbed mesic sugar maple-beech (Acer saccharum-Fagus grandifolia) forest in Kalamazoo Co., Michigan, was investigated by point-quarter and transition matrix methods. The results indicate that this forest is dominated by sugar maple in both canopy and understory composition. Beech is the second most important species. Fourteen species were found as canopy trees or replacements. The hypothesis that a young forest is more diverse than comparable climax forests such as Warren Woods and Hueston Woods was supported. Its successional trend is that sugar maple will become more abundant at the expense of the other species. Beech is a ...


The Effects Of Increased Concentrations Of Oxygen On The Survival, Growth, Development And Metabolism Of Shell-Less Chick Embryos, Army Lester Iii Jul 1985

The Effects Of Increased Concentrations Of Oxygen On The Survival, Growth, Development And Metabolism Of Shell-Less Chick Embryos, Army Lester Iii

ETD Collection for AUC Robert W. Woodruff Library

The embryo culture system, which allows complete access and continuous observation of developing embryos, is a valuable biological tool. The chick embryo system has already proven useful in studies of tissue grafts, calcium absorption and teratogenic agents, however, its application has been limited because of the reduced rates of growth, development and survival of shell-less embryos in comparison to embryos maintained in~. This study was therefore conducted to aid in the design of a shell-less culture system that would support complete and normal growth and development of shell-less chick embryos. The work presented here provides the first detailed study to ...


In Vivo And In Vitro Evidence For The Synthesis And Processing Of A Styrene Oxide Induced Form Of Epoxide Hydrolase, Jewell D. Wilson Jul 1985

In Vivo And In Vitro Evidence For The Synthesis And Processing Of A Styrene Oxide Induced Form Of Epoxide Hydrolase, Jewell D. Wilson

ETD Collection for AUC Robert W. Woodruff Library

In vivo and in vitro studies have been done to determine the site of biosynthesis and processing of styrene oxide (SO) induced epoxide hydrolase (EH). Adult male Long—Evans rats were used to induce a form of epoxide hydrolase using styrene oxide as the inducing agent. Rats were administered 500 milligrams of SO per milliliter of corn oil intraperitoneally per day. They were sacrificed forty-eight hours post-injections and the livers were quickly removed, homogenized and fractionated on a sucrose discontinuous density gradient to obtain the microsomal fraction. Epoxide Hydrolase was synthesized in a cell—free system using a rabbit reticulocyte ...


Dynamics Of Steroid Secretions In Rats, Abdelhamid Mahmoud Hasan Jun 1985

Dynamics Of Steroid Secretions In Rats, Abdelhamid Mahmoud Hasan

Biology Master’s Theses

In spite of the vast information available on hormone secretions and their levels in blood, there is a paucity of information in age related changes in the dynamics of steroid metabolism in male rats. Also, few investigations exist concerning the metabolic clearance rates (M.C.R.) of steroids in blood of female rats.

This thesis consists of two parts, the first part deals with changes in M.C.R. in aging male rats and the second part in pregnant rats. It examined these changes relative to testosterone (T), estradiol (E2), and progesterone (P), using the non-equilibrium single dose injection ...


Investigations Of Balsam Woolly Aphid - Fraser Fir Interaction: Feeding Site Characteristics And Wound Response, Christopher Eagar Jun 1985

Investigations Of Balsam Woolly Aphid - Fraser Fir Interaction: Feeding Site Characteristics And Wound Response, Christopher Eagar

Doctoral Dissertations

Young, vigorously growing Fraser firs have exhibited a lower degree of susceptibility to balsam woolly aphid infestations than mature, mixed stands. This study investigated the relationship between balsam woolly aphid feeding site preference and bark morphological features, plus how these morphological features varied with stem size, age, growth rate, percent live crown and stand structure characteristics. Investigations were also conducted on the wound healing processes within the bark of Fraser fir as well as on how the aphid might interfere with these processes. Sampling was performed in the stands considered to be representative of anticipated conditions for the next generation ...


Gap And Stand Dynamics Of A Southern Appalachian Spruce-Fir Forest, Richard T. Busing Jun 1985

Gap And Stand Dynamics Of A Southern Appalachian Spruce-Fir Forest, Richard T. Busing

Doctoral Dissertations

Southern Appalachian spruce-fir forest dynamics were investigated by field studies and computer simulations. Mechanisms of old-growth stand dynamics were determined in a Great Smoky Mountains spruce-fir forest (elev. 1770-1830 m). The possible effects of anthropogenic disturbances on the mature forest were investigated with a gap model adapted to upper spruce-fir zone forests.

An analysis of stand dynamics involved the study of population interactions in the context of gap phase dynamics. Tree population structure and dispersion were quantified. Regeneration requirements and canopy-understory interactions were determined. Canopy turnover was modeled using species-by-species gap phase tree replacement probabilities. Finally, a spatial gap model ...


Enzymatic Modification Of Synthetic Mrna's And Their Interaction With Proteins, Benny Washington Jr. May 1985

Enzymatic Modification Of Synthetic Mrna's And Their Interaction With Proteins, Benny Washington Jr.

ETD Collection for AUC Robert W. Woodruff Library

All eukaryotic mRNAs analyzed to date contain, at their 5' end, a cap structure consisting of a reversed 7-methyl guanosine residue linked at the 5' position of the ribose by a triphosphate to the 5'- position of the terminal residue. Since its discovery, the cap structure has been shown to play an important role in the control of initiation of protein synthesis. Further characterization of mRNAs has revealed other unique properties. Its 3' terminus in most eukaryotes is enriched with a sequence of adenylic acid residues called the poly(A) tail. Photoaffinity binding studies, using photoaffinity capped mRNAs and mRNAs ...


Production Of Monoclonal Antibody Against Alkaline Phosphatase Isolated From Mouse Lymphoid Cell Line Sjl 46, Nathaniel Ndamadu Shidali May 1985

Production Of Monoclonal Antibody Against Alkaline Phosphatase Isolated From Mouse Lymphoid Cell Line Sjl 46, Nathaniel Ndamadu Shidali

ETD Collection for AUC Robert W. Woodruff Library

Alkaline phosphatase (APase) is a cell surface enzyme found to be associated with the membrane of lymphoblastic cells and some lymphoid cell lines. This enzyme appears and disappears in the early differentiation processes of the cells of the immune system (B and T cells). The appearance of APase in pre-T cells seems to preceed that of terminal deoxynucleotide transferase (TdT). The specific role of APase in T cell differention path way is not known. It has been hypothesized that APase acts as an early differentiation marker for pre-T cells.

The goal of this research is to produce a monoclonal antibody ...


Failure Of Opioids To Modify Noradrenergic Neuronal Recovery From A Dorsal Bundle Lesion In Neonatal Rats, Ellen L. Kunkel-Bagden May 1985

Failure Of Opioids To Modify Noradrenergic Neuronal Recovery From A Dorsal Bundle Lesion In Neonatal Rats, Ellen L. Kunkel-Bagden

Electronic Theses and Dissertations

Morphine and exogenous opioid peptides alter the development of central noradrenergic neurons damaged by neonatal treatment with the neurotoxin 6-hydroxydopa. Transection of the dorsal noradrenergic bundle (DNB) in neonatal rats produces nearly the same alteration in the developmental pattern. It was of interest to determine whether morphine or an exogenous opioid peptide (metenkephalin) was able to modify the recovery of noradrenergic neurons after neonatal surgical transection of the DNB. Neonatal rats were divided into two groups. Both groups received saline (0.85%) or naloxone (2.0 mg/kg) by the intraperitoneal (i.p.) route. In the first group the animals ...


Sulfate Leaching From Sulphur Binding Agents In Experimental Asphalt Pavement, Angelina County, Texas, Peter Blanchette May 1985

Sulfate Leaching From Sulphur Binding Agents In Experimental Asphalt Pavement, Angelina County, Texas, Peter Blanchette

Electronic Theses and Dissertations

Sulfate leaching from sulphur-binding agents used in asphalt pavement was significantly higher (p>.05) from four layers of a mixture of a single aggregate base material of hot sand, when compared to all other treatments. Analysis of the data showed that the other treatments had no overall effect on the soil sulfates. Four layers of a single aggregate of hot sand increased the quantity of sulfates in the soil by 107%. I recommend the use of sulphur-asphalt binder with the type "D" base material throughout construction or when two layers of the type "D" base material are placed on top ...


Two Year Survival And Growth Of Loblolly Pine Seedlings From Two Texas Seed Sources On Lignite Minesoils, Gerald Allen Wood May 1985

Two Year Survival And Growth Of Loblolly Pine Seedlings From Two Texas Seed Sources On Lignite Minesoils, Gerald Allen Wood

Electronic Theses and Dissertations

Loblolly pine seedlings from Lost Pines (drought-hardy) and East Texas (regular) seed sources were planted in lignite minesoils in Panola County, Texas. Heights, root-collar diameters, and survival were monitored for two years. Treatments included application of Pisolithus tinctorius basidiospores immediately after planting and use of acephate for tip moth control during the second growing season. Standard foliar analyses were conducted at the end of the second growing season. East Texas seedlings grew more in height and root-collar diameter, and had higher survival percentages than Lost Pines. No growth response from treatment with P. tinctorius was observed. Treatment with acephate resulted ...