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Ultrastructure Of The Tegument Of Intramolluscan Stages Of Proterometra Edneyi Nomen Nudum, Robin Munsey

Masters Theses & Specialist Projects

Larval stages of Proterometra edneyi nomen nudum were obtained from Goniobasis laqueata and prepared for transmission and scanning electron microscopy. The tegument of rediae, cercariae within rediae and mature cercariae were observed to see if any differences occurred in relation to enivronmental and functional factors. The tegument was found to be similar in organization to that previously reported for other trematodes. Rediae were found to have patterned, folded teguments with many small microvilli indicative of the function of this surface to absorb nutrients. Microvilli were also present on the tegument of the cercarial body within the rediae along with infoldings …

Remembrance Of Places Lasts: Proactive Inhibition And Patterns Of Choice In Rat Spatial Memory, William A. Roberts, Robert H.I. Dale

Scholarship and Professional Work - LAS

A series of experiments was carried out to evaluate the notion that rats given a sequence of massed daily trials on the radial maze reset working memory at the end of each trial by deleting its contents. Although curves presented by D. S. Olton [Scientific American, 1977, 236, 82-98: In S. H. Hulse, H. Fowler, & W. K. Honig (Eds.), Cognitive processes in animal behavior, 1978, Hillsdale, N.J.: Erlbaum] show that rats return to errorless performance at the beginning of each trial after the first, the fact that accuracy falls less rapidly over choices on Trial 1 …

The Spatial Distribution Of Phytoplankton In Westhampton Lake, Richmond, Virginia, James William Newlin

Master's Theses

The hypothesis is that spatial distributions of phytoplankton standing crop and photosynthetic capacity in Westhampton Lake are homogeneous was tested. Distributions were analyzed with respect to horizontal and vertical planes separately and combined. The study was divided into three time period: 1) late summer stratification, 2) early fall mixing, and 3) fall turnover, based on isothermal lines of the lake at the deepest station. Phytoplankton standing crop was measured by spectrophotometric and fluorometric methods. The photosynthetic capacity was measured flurometrically. Combined horizontal and vertical spatial distribution of standing crop was clumped for the entire lake and during each time period. …

The Effects Of Photoperiod And Melatonin Injections On The Reproductive System Of Pinealectomized Male Mice Mus Musculus, Icr Strain, John Earnest Constantine

Master's Theses

One hundred two male mice , Mus musculus, ICR strain, age four weeks, were obtained. Fifty-one mice were pinealectomized and 51 were sham operated. The animals were divided into three photoperiod groups: 1.5L:22.5D, 14L:10D, 24L; 0D. The mice were subcutaneously injected daily with 10 ug melatonin or control solution from post-operative day J to post-operative day 60, On post-operative day 60 representatives of each photo­ period-surgery-injection regimen were paired with females. The remaining animals were killed and several organs were removed and weighed, Melatonin injections were progonadal in pinealectomized mice and inhibitory in sham mice in several instances. Histological examination …

Electrophoretic Mobilities Of Topoisomers Of Φx174 Dna, Virginia Mckee Hanson

Loma Linda University Electronic Theses, Dissertations & Projects

The analysis of nucleic acid structure by zone electrophoresis in agarose gels has become an increasingly important method in studies requiring the separation and identification of species differing only slightly in molecular weight or conformation. We have demonstrated the existence of several circular DNA forms that appear in cells infected with the bacteriophage ΦX174.

Wt/am3 heteroduplex molecules containing a single base mismatch (relaxed RFI molecules) were constructed in vitro, purified by sedimentation, and analyzed by zone electrophoresis on 1.4% agarose gels. In order to verify that the band of denaturation-resistant heteroduplex was indeed relaxed RFI, we compared …

Cadmium And Zinc Levels In The Hair Of Smokers And Nonsmokers, Neal R. Simonsen

Dissertations and Theses

To determine the relationship of tobacco and marijuana smoking to levels of cadmium and zinc manifested in hair samples, a study was conducted at Portland State University using atomic absorption spectrophotometry. 97 adult student volunteers participated in the main study.

A Genetic And Physiological Study Of An Arsenite Resistant, Uncoupled Mutant Of Escherichia Coli, Daniel Gordon Smiley

Dissertations and Theses

Chromosomally determined arsenate resistance in Escherichia coli is well characterized. Little, however, is known about chromosomally determined arsenite resistance in E. coli. Accordingly, spontaneous arsenite resistant mutants were selected in a plasmid free strain of E. coli. One mutant strain was analyzed in detail, genetically and physiologically. The mutation confering arsenite resistance was shown to be a single gene mutation. Genetic mapping studies using conjugation and transduction showed that the mutation was closely linked to the ilv region of the E. coli map.

Physiological studies of this mutant showed that it shared characteristics common to those of mutants …

Systematics Of Isocarpha (Compositae: Eupatorieae), David J. Keil, Tod F. Stuessy

Biological Sciences

Isocarpha comprises five species ranging from southern Texas and the Bahamas to northern Peru and northeastern Brazil. The genus belongs in Eupatorieae rather than Heliantheae, but structure of the head of Isocarpha with its elongate, chaffy receptacle is anomalous within Eupatorieae. An hypothesis is presented suggesting the evolutionary derivation of this type of head through formation of floral buds in the axils of the involucral bracts. Generic ties of Isocarpha within Eupatorieae are unclear, but the closest affinities appear to be with Ayapana and relatives.

Occurrence Of Psilocybin/Psilocin In Pluteus Salicinus (Pluteaceae), Stephen G. Saupe

Biology Faculty Publications

No abstract provided.

Opportunistic Species Of Macrobenthos In A Sewage-Polluted Lagoon, And An Analysis Of The Indicator Concept, Raymond E. Grizzle

Retrospective Theses and Dissertations

No abstract provided.

Population Structure And Reproduction In The Introduced Florida Population Of The Pike Killifish, Belonesox Belizanus (Pisces: Poeciliidae), James S. Turner

Retrospective Theses and Dissertations

The pike killifish, Belonesox belizanus Kner, is the largest member of the live-bearing family Poeciliidae. The species is native to Central America, and was introduced into Dade County, Florida in 1957. B. belizanus is primarily piscivorous, and has been identified as a potential ecological "problem" species for Florida due to its heavy predation on small native fishes, especially the mosquitofish (Gambusia affinis). The population structure and reproduction of the Florida population were investigated in this study from field samples and aquarium observations. The mean standard length (SL) of mature females was about 103 mm. Most females larger than 75 mm …

Characterization Of Gram-Positive Bacterial Isolates From Burn Victims, Trisha A. Hannan

Dissertations and Theses

Streptococcus and Staphylococcus were collected from patients hospitalized at the Oregon Burn Center, Emanuel Hospital, Portland, Oregon, between October 27, 1980 and January 1, 1981. Forty-five isolates of Staphylococcus and twenty-one isolates of Streptococcus, Lancefield Group D, were included in the investigation.

The objectives of the investigation were: (i) to identify to the species level all isolates, (ii) to determine their susceptibility to antimicrobial agents, (iii) to test the organisms. over time for increasing resistance to silver, (iv) to determine, if present, a bacterium harbored within the burn unit (nosocomial bacterium), and (v) to determine any recognizable pattern of successive …

The Biological Effect Of Evernimicin B On Bacillus Subtilis W2 3 And Three Antibiotic-Resistant Strains Of Staphylococcus Aureus, Steven Bogach

Masters Theses & Specialist Projects

One strain of Bacillus subtilis and three antibiotic-resistant strains of Staphylococcus aureus were employed to determine the biological effects of everninomicin B (EvB), a naturally occurring antibiotic produced by Micromonospora carbonacea (NRRL 2972) and M. carbonacea var. aurantiaca. Minimum inhibitory concentration (MIC) of EvB for B. subtilis was 1.2 x 10^-3 µmole/ml of EvB in glucose minimal broth and 2.6 x 10^-3 µmole/ml of EvB in nutrient broth. MIC values of EvB for S. aureus were 3.25 x 10^-4 µmole/ml of EvB for strains resistant to penicillin or tetracycline and 6.5 x 10^-4 µmole/ml of …

A Morphometrical Analysis Of The Guinea Pig Placenta After Chronic Exposure To Carbon Monoxide, Marcella J. Woolsey

Loma Linda University Electronic Theses, Dissertations & Projects

We used morphometric analysis to determine if placental structure is modified by carbon monoxide, Camm-Hartley guinea pigs were exposed throughout gestation to chronic conditions of carbon monoxide (averaging about 180 parts per million). Maternal weight, placental weight, fetal weight, and fetal length were recorded at the time of placental fixation. Using a computerized image analyzer on photomicrographs obtained through light microscopy, we measured maternal and fetal percent vessel volumes, surface areas, and vessel numbers. Maternal vessel numbers and surface area remained basically unchanged but decreased slightly. Maternal percent volume decreased 15%. However, fetal capillary number increased 35% (p < 0.01) from a control value of 2325 ± 184 per mm² (SE …

A Study Of Seasonal Occurences & Movement Patterns Of Fishes In Barren River, William Kruskamp

Masters Theses & Specialist Projects

The ichthyofauna of the Barren River tailwater was studied from October 1979 to August 1980 to determine seasonal occurrences and movement patterns in relation to discharges from Barren River Lake. Thirteen families and 38 species were represented in the 15,408 fish captured. The season in which the greatest number of fish was captured was winter (7,731) with the highest monthly total occurring in February (5,159). These large totals resulted mostly from the presence of small gizzard shad. The greatest number of fish per kilometer of river sampled occurred in spring just below the dam at River Kilometer 127. Of the …

The Effects Of Denervation On Caudal Fin Regeneration In The Goldfish, Carassius Auratus (Linnaeus), Janet Rowlett

Masters Theses & Specialist Projects

Goldfish of the wild-strain variety, Carassius auratus, were used in the study of caudal fin regeneration. The purpose of this study was to determine the effects of denervation on caudal fin regeneration.

In the experimental groups, it was evident that denervation did not prevent regeneration, although it was significantly reduced. Statistical analysis using the Duncan's Multiple Range Test showed a highly significant difference (0.01 % level) in the mean percentage of regeneration between the denerved group and the other three groups.

Caudal fins having proximal amputations regenerated at a faster rate than those having distal amputations, producing a higher …

The Effects Of Controlled Harvest On Some Biological Characteristics Of Smallmouth Buffalo In Rough River Lake, Kentucky, Dennis Webb

Masters Theses & Specialist Projects

In Rough River Lake, Kentucky, effects of controlled harvest of some biological characteristics of smallmouth buffalo were investigated from December 1979 through July 1980. Spawning activity was monitored from 28 March through 24 July with buffalo larvae occurring for one week. A successful spawn was precluded by non-optimum water levels or other conditions operating in the lake. Commercial harvest was monitored from December 1979 through March 1980, and age and growth features were determined from 783 smallmouth buffalo representing a portion of the 3955 buffalo removed from Rough River Lake in 1979-80. A population estimate of the Rough River Lake …

Fungal Metabolite From Members Of The Genus Rhizopus, D Thompson, A Smalley, Broderick Eribo

Department of Biology Faculty Publications

A fluorescent metabolite present in seven members of the genus Rhizopus was isolated. This compound appeared green before spray treatment and purple after spray treatment with p-anisaldehyde in visible light. Subsequent purification and structural elucidation of the isolated compound yielded 1-[2,6,10,14-tetramethyl-17-carbomethyl heptadecyl]-1-[2,6,10,14-tetramethyl-17-methanoyl heptadecyl]-benzene.

Population Stability Of Three Species Of Zooplankton In Westhampton Lake, Richmond, Virginia, James Christopher Conyers

Master's Theses

Populations of zooplankton, Keratella cochlea's (Rotifera) Bosmina longirostris (Cladocera), and Mesocyclopsedax (Copepoda) were sampled in Westhampton Lake from June 30 to December 22, 1978. Population densities were estimated over time and analyzed for stability relative to the occurrence of rainfall. Two aspects of stability were used for analysis and given operational definitions as follows: Resistance - a population was resistant if its density was not more variable during periods of rain compared with periods of little or no rain; Persistence - a population was persistent if its density during periods of rain was not different from its density in periods …

Vegetation Responses To Prescribed Burning In A Mixed-Conifer Woodland, Cuyamaca Rancho State Park, California, Bradford D. Martin

Loma Linda University Electronic Theses, Dissertations & Projects

This study reports the results of light intensity prescribed burning on the vegetation of 3 jeffrey pine-black oak woodland sites in Cuyamaca Rancho State Park, California. The 1.2 ha, 85 ha, and 6 ha burn plots were measured for tree and shrub density and basal area 6 months, 1% years, and 2 years following burning for the 3 sites respectively. Each burn site measured was compared against equivalent unburned control plots to help assess the effects of the burning. Density of saplings, seedlings, and herbaceous vegetation was also determined for the woodland understories. Dominance and relative dominance of herbaceous ground …

Effect Of Simulated Tidal Patterns On Growth And Growth Line Formation In The Little Neck Clam, Protothaca Staminea, Orlando Irsula

Loma Linda University Electronic Theses, Dissertations & Projects

Growth lines in bivalve mollusks have been thought to reflect solar days, circadian rhythms and/or tides. Tides seem to be the dominating influence in some intertidal species. This study provides laboratory evidence suggesting that tides are a major influence in the number of growth lines in the clam Protothaca staminea.

Clams were grown under 4 different "tidal" regimes, (0, 1, 2 and 3 tides per day) for forty-one days. Acetate peels of shell cross sections were used for growth line counting. Photomicrographs and measurements showed a striking difference in the growth and number of growth lines between the 4 tidal …

Biphenyl Hydroxylation By Vole Hepatic Microsomes, Moheb H. Makary

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Metabolism of biphenyl by meadow voles (Microtus montanus) liver microsomes was studied by gas liquid chromatography. The microsomal biphenyl hydroxylation of Swiss Webster mice (outbred) was also investigated to provide a species comparison. 4-hydroxybiphenyl (major metabolite), 3-hydroxy biphenyl (minor) and smaller amounts of 2-hydroxybiphenyl were identified as metabolites of biphenyl incubated with vole liver microsomes. Liver microsomes from Swiss mice formed 4-hydroxy biphenyl (major metabolite) and almost equal amounts of 2- and 3-hydroxy biphenyl (minor metabolite). The amount of the hydroxy biphenyls formed by vole liver microsomes was considerably less per milligram of microsomal protein than for mice. …

Field Studies Comparing The Effectiveness Of A Synthetic Female Sex Pheromone ([R,Z]-5-[1-Decenyl] Dihydro-2[3h]-Furanone) And A Floral Bait (Phenylethyl Propionate + Eugenol 7:3) In Controlling Adult Populations Of The Japanese Beetle (Popillia Japonica Newman), Sharon Kay Stahl

Morehead State Theses and Dissertations

A thesis presented to the faculty of the School of Sciences and Mathematics at Morehead State University in partial fulfillment of the requirements for the Degree of Master of Science by Sharon Kay Stahl on April 22, 1981.

Blackbird & Starling Roosts In Warren County, Kentucky, Wayne Mason

Masters Theses & Specialist Projects

Blackbird and Starling roosts of the 1979-80 winter season were observed in order to obtain as much information as possible concerning roosts in this area. Five species were found to comprise the local roosts: The Common Grackle (Quiscalus quiscula), Red-winged Blackbird (Agelaius phoeniceus), Brown-headed Cowbird (Molothrus ater), Rusty Blackbird (Euphagus carolinus), and the Starling (Sturnus vulgaris).

Seven categories of activities were observed in roost species: predeparture vocalizations; predeparture staging; roost departure; daily activities; roost return; preroost staging; and settlement into the roost. The Common Grackle appeared to be the species around which …

The Hatching And Emergence Of Loggerhead Turtle (Caretta Caretta) Hatchlings, Richard J. Demmer

Retrospective Theses and Dissertations

Loggerhead turtle (Caretta caretta) eggs were collected at the time of laying during the summer of 1977 on the beaches of Canaveral National Seashore and the Merritt Island National Wildlife Refuge in Brevard County, Florida. The eggs were placed in land-lines buckets and maintained at ambient temperature in a house trailer hatchery. After 50 to 55 days of incubation whole or partial clutches were transferred to glass observation containers and covered to a depth of 20 cm. Hatching and emergence behavior were visually observed and activity was timed on an event recorder that was activated by four motion switches placed …

The Diversity And Abundance Of The Benthic Macroinvertebrates In An Oligo-Mesotrophic Central Florida Lake, Jeffrey F. Spence

Retrospective Theses and Dissertations

Benthic macroinvertebrates and physicochemical parameters were sampled monthly in Spring Lake, Florida from July, 1978, to June, 1979. Spring Lake is a slightly acidic, sand bottom lake located in the sandhill region of the Central Highlands. While submersed vegetation is not dense, the lake does contain an abundance of the endemic submersed plant Mayaca aubletii. The littoral zone is dominated by plants belonging to the genera Panicum, Nuphar, Hydrocotyle, Nymphaea, Satittaria, and Typha. The benthic macroinvertebrates collected consisted of 51 species; approximately 50 percent were in the family Chironomidae. The annual mean number of individuals was 947/m2. The mayfly Hexagenia …

The Effects Of Grass Carp (Ctenopharyngodon Idella Val.) Upon The Submersed Macrophytic Vegetation In Central Florida Lakes, Winston K. Borkowski

Retrospective Theses and Dissertations

The biomass of the submersed macrophytic vegetation in four hydrilla (Hydrilla verticillata Royle) infested lakes in central Florida was monitored for one year. Lake Orienta and Little Lake Fairview received 2,320 and 960 grass carp, respectively, while Clear Lake and Lake Mann did not receive grass carp. Hydrilla was eliminated in Lake Orienta within six months of stocking; the lake was stocked at 19 grass carp/mt hydrilla (45 fish/ha). Hydrilla was not eliminated from Little Lake Fairview which contained 9 grass carp/mt hydrilla (30 fish/ha). The growth of hydrilla was restricted in Little Lake Fairview which produced 0.380 mt hydrilla, …

Seasonal Periodicity Of Periphytic Algae In Relation To Water Quality In Three Florida Experimental Ponds, Michael J. Gilbrook

Retrospective Theses and Dissertations

Periphytic algae biomass, periphyton taxonomic composition and water quality were monitored from October, 1978 through October, 1979 in three experimental ponds on the University of Central Florida campus, Orlando, Florida. Differences in the abundance and seasonal periodicity of phytoplankton in the ponds presumably arose from intrinsic differences in the nature of the pond sediments. Ceramic tile and pressboard wood artificial substrates were sampled at two-month intervals to provide estimates of periphyton biomass and productivity; there was no significant difference in algal biomass on wood and tile substrates. Algal productivity on continuous-immersion (cumulative) substrates which supported a large accumulation of periphyton …

Nutrient Retention In Shallow Reservoirs Using Selected Aquatic Macrophytes, Phillip D. Sacco

Retrospective Theses and Dissertations

A field experiment was conducted to evaluate the possibility of using shallow reservoirs containing aquatic plants to reduce excess nutrient levels of agricultural drainage effluent from organic soils. The reservoir systems consisted of three small reservoirs in series, containing separate stands of Eichhornia crassipes, Egeria densa and Typha sp., and a single large reservoir containing equal areas of all three aquatic plants. A control reservoir without plants was included. Drainage water from organic soils was pumped through each reservoir at 39.6 l/sec., 6 hours per day, 6 days per week. the major nutrients monitored in theses flow-through systems included nitrate-N, …

An Experimental Study Of Dispersal Of The Cotton Rat, Sigmodon Hispidus, Stephen R. Stafford

Retrospective Theses and Dissertations

Dispersal of cotton rats was examined over an annual cycle of abundance by removal trapping in pine flatwoods. All cotton rats live-trapped at biweekly intervals on two 0.49 ha grids were removed, whereas rats on an adjacent control grid were tagged an released alive on site. The null hypothesis was that dispersing cotton rats would represent a random sample of sex and weight (age) classes from source populations, e.g. the control grid. Likewise, it was assumed that dispersal rates would be proportional to numerical changes in abundance on the control grid. Dispersing animals were clearly most prevalent on the removal …