Life Sciences Commons^™

Modulation Of Ascending Electrosensory Information By Descending Pathway Stimulation In The Channel Catfish, Lizabeth Scoma

Master's Theses

No abstract provided.

Isolation And Analysis Of A Cdna From The Gag/Protease Region Of The Soybean Retrotransposon, Sire-1, Yi-An Bi

Master's Theses

No abstract provided.

Pcr Cloning And Sequencing Of A Cdna Coding For A Nitrate Reductase Isoform From Soybean, Glycine Max, James Schavocky

Master's Theses

No abstract provided.

Innervation Patterns In Neuromasts Of The Mottled Sculpin, Cottus Bairdi, Jie He

Master's Theses

No abstract provided.

An Evaluation Of Hands-On Instruction As A Method To Improve Observation Skills In Second Grade Students, Lydia Rogers

Master's Theses

A hands-on assessment tool for testing second-grade students' ability to discriminate physical attributes (size, shape, color, texture, pattern, edge, part-to-whole, and type) of mollusk shells was developed, pretested, and administered to 48 second-grade students at Maybeury Elementary School, Henrico County, Virginia. Treatment group students (n = 24) attended five afterschool, activitybased classes in which close observation of object a~tributes was taught. The classes included the same discriminations as did the assessment test but used different materials. Control and test group students were retested. Neither paired t test nor question-by-question analysis showed a significant improvement in the test group's score. Presence …

Relationships Of Epidermal Morphology And Breeding Behaviors In Pebble Nest-Building Minnows (Pisces: Cyprinidae), William R. Mcguire

Master's Theses

Abstrad The objective of this study was to determine if epidermal morphology corresponds with reproductive behavior in cyprinid fishes. Representative species of nest-building fishes (Nocomds leptocephalus, Semotilus atromeculatus, exoglossum maxillingua) and non nest-building fishes (Campostoma anomaulm and Clinostomus funduloides) were studied. Light and scanning electron microscopy were used to examine epidermal morphology and keratin distribution of skins from the snout, cheek, mandible, anterior dorso-lateral trunk, and caudal peduncle of breeding males of nest-building species and were compared to those in non nest-building cyprinid species. Previous frame-by-frame analysis of video tapes of reproductive activities of each species and literature accounts were …

Relationship Between Intracellular Ph And Calcium Uptake In The Skeletal Muscle During Sepsis, Gin Mo

Master's Theses

No abstract provided.

Effects Of Perinatal Cocaine Exposure On Sexual Differentiation In The Rat Brain, Heather L. Maecker

Master's Theses

No abstract provided.

Functional Effects Of Monoclonal Antibodies Directed Against The Tcr/Cd3 Complex Of Various T Cell Phenotypes, Mortimer T. Alzona

Master's Theses

No abstract provided.

The Effects Of Crayfish Grazing On Benthic Algal Community Dynamics In Southwestern Lake Michigan, Kristi A. Zenchak

Master's Theses

No abstract provided.

The Inhibitory Effects Of The Extracts Of Zingiber Plants On The Adsorption, Growth, And Replication Of Phage Lpp-1 In Cyanobacterium, Ebby Paul Jido

Master's Theses

No abstract provided.

Localization Of A Collagenous Protein In The Organic Matrix Of Spicules From The Octocoral Leptogorgia Virgulata (Cnidaria: Gorgonacea), Jeffrey L. Dupree

Master's Theses

Calcareous body inclusions are commonly found throughout the invertebrate taxa. Elaborately structured calcium carbonate spicules are the major mineralized body inclusions of the gorgonian, Leptogorgia virgulata. Spicule formation in this octocoral, as well as other calcium carbonate invertebrate structures, is apparently regulated by the intra-spicule organic matrix. Recent findings show that the insoluble fraction of the spicule organic matrix is collagenous. Collagen, although integral to calcium phosphate structures found in vertebrates is not usually associated with the formation of invertebrate calcium carbonate structures. Interestingly, collagen is present in the organic matrix during the summer but absent in winter. This suggests …

Effects Of Induced Cold Torpor And Hypoxia On Cardiac Mitochondrial Cytochrome Oxidase Activity, Phospholipid Content And Ultrastructure In The Fresh Water Turtle, Pseudemys Scripta, George Demos

Master's Theses

No abstract provided.

A Comparison Of Catecholamine Metabolism And Related Enzyme Activity In Parasitized And Nonparasitized Drosophila Melanogaster, Emily Vass

Master's Theses

No abstract provided.

Detection Of Dimethylallypyrophosphate : 5'Amp Transferase Enzyme In Saccharomyces Cerevisiae, Raymond J. Federico

Master's Theses

No abstract provided.

Investigating The Viability Of Yeast Expressing Histone From Extrachromosomal Dna : Progress In Construction Of A Plasmid Bearing One Copy Of Each Yeast Histone Gene, Ralph Donaldson Hellams Jr.

Master's Theses

Much of the current information on histones has been based on in vitro studies. The original goal of this research was to construct a mutant strain of Saccharomyces cerevisiae containing all chromosomal copies of the yeast histone genes made nonfunctional. This project would demonstrate whether such a strain could be rescued by a plasmid carrying the wild-type copies of the four core histone genes. Furthermore, this yeast strain construct would allow future investigations to take advantage of histone mutant analysis in vivo. The critical step in beginning this work was the construction of a plasmid which contained the genes …

Long Range Organization Of Alphoid Sequence On Human Chromosome 21, Malini Chawla

Master's Theses

No abstract provided.

Atrial Natriuretic Factor In Meriones Unguiculatus, The Mongolian Gerbil, Kyriakos Tarasidis

Master's Theses

The basis for the great osmoregulatory ability in Meriones unguiculatus, the Mongolian gerbil, has been studied previously, but as yet no clear mechanism has been determined. The present study investigated the level of cardiac atrial natriuretic factor (ANF) under high and low sodium stress. In addition, cardiac ANF values for the Mongolian gerbil were compared with another desert mammal (Mesocricetus auratus, the Syrian golden hamster) and a non-desert mammal, (Rattus norvegicus, the white rat). ANF was found to exist in the hear atria of the Mongolian gerbil at a level of 388±66 µg ANF/g tissue. High and low sodium stress …

Structure And Function Of Human Alphoid Dna, Darryl S. Schlegel

Master's Theses

No abstract provided.

Quantitation Of Type I Collagen Mrna In Intact Human Fibroblasts, Edward Touma

Master's Theses

No abstract provided.

Vitello-Lipid And Vitello-Protein Deposition In Environmentally Stressed And Non-Stressed Populations Of Morone Saxatilis (Striped Bass), David Van Grimes

Master's Theses

Summer somatic indices of three and four year old striped bass (Morone saxatilis) from Lake Anna (LA), Virginia, a cooling water reservoir, indicated prey ingestion was not sufficient to maintain growth during summer months when striped bass metabolism was elevated by thermal and hypoxic stress. Vitello-lipid and vitello-protein concentrations of stressed LA striped bass were compared to those of non-stressed striped bass from Smith Mountain Lake (SML) , Virginia, a hydroelectric reservoir. Seasonal comparisons of LA and SML striped bass vitello-lipid concentrations and vitello-protein concentrations showed no significant differences between sites (P [less than or equal to] 0.05). Vitello nutrients …

Seasonal Fluctuations Of Thermophilic And Psychrophilic Bacteria In Westhampton Lake, Richmond, Virginia, Chukwukere Godwin Durunna

Master's Theses

This study was based on the hypothesis that the populations of thermophilic, mesophilic, and psychrophilic bacteria in Westhampton Lake vary seasonally and are related to prevailing temperatures. It may be inferred that the kinds of bacteria present at a given season are those most directly involved in decomposition and recycling activities in the lake. Water samples were collected biweekly from September of 1986 through mid- August 1987 at three stations in Westhampton Lake. At each station, sample depths ranged from near the surface to near the bottom. Serial dilutions were plated in duplicate on nutrient agar and were incubated at …

Alpha₂-Macroglobulin: Its Purification And Interactions With Proteases, Lectins, And Cellular Receptors, Victor Jerry Buktenica

Master's Theses

No abstract provided.

Regulation Of Gonadotropins By Steroids In Isolated Rat Pituitary Cells, Lenette L. Renier

Master's Theses

No abstract provided.

The Altered Configuration Of The Chronically Hyperinflated Thorax, John M. Walsh

Master's Theses

No abstract provided.

Regulation Of Fatty Acid Biosynthesis By Physical Exercise Mechanisms Of Inhibition, Rita Priyadarshani Francis

Master's Theses

In partially purified cell-free extracts of rat liver, nonexhaustive, daily exercise results in a 40 to 90% inhibition of FAB by decreasing the catalytic activity of acetyl coenzyme A carboxylase (ACC), the rate-limiting enzyme in the de novo FAB pathway in vitro. ACC inhibitory mechanisms are postulated to include: phosphorylation of ACC and production of a noncompetitive inhibitory substance.

Data obtained after purification of rat liver ACC to homogeneity suggest that decreased ACC activity in exercised rats cannot be attributed to the well-documented control of ACC by reversible phosphorylation, but are more likely due to the presence of a noncompetitive …

Isolation And Analysis Of The Nitrate Reductase Structural Gene From Squash, Cucurbita Maxima, David Joseph Bryk

Master's Theses

No abstract provided.

Frequency Of Rickettsia Sps. In Dermacentor Variabilis And Amblyomma Americanum In Central Hanover County, Virginia, Peggy Ann Keefe

Master's Theses

In the eastern United States, Dermacentor variabilis is the primary vector of Rickettsia rickettsii, the etiological agent for Rocky Mountain Spotted Fever. Cases of Rocky Mountain Spotted Fever in eastern United States increased steadily from 1959 to 1979 to a peak of one case per 200,000 people in 1979 (Morbidity and Mortality Weekly Report, 1985). In 1976, 98.9% of the reported cases of Rocky Mountain Spotted Fever were east of the 100th meridian with 1.1% occurring west of the 100th meridian (Burgdorfer, 1977). Hanover County, Virginia is an endemic area for this disease (Sonenshine, 1971); the last reported case was …

Pebble Nest Microhabitats Of Semotilus Species (Pisces: Cyprinidae), James Timothy Magee

Master's Theses

The pebble nest microhabitats of four species of Semotilus were compared. Pit/mound nests of Semotilus corporalis were significantly larger than the pit/ridge nests of Semotilus atromaculatus, Semotilus lumbee, and Semotilus thoreauianus. Nests of S. corporalis were in wider and deeper streams. Pits of S. lumbee nests were longest of the four species; those of S. corporalis were widest and deepest. Semotilus corporalis used a greater proportion of larger stones (23 mm or greater) in nest construction than the other three species. There was no significant difference in the electivity index (percentage of nest pebble sizes versus those of the substrate) …

Behavioral Determination Of A Geomagnetic Senstivity In The Atlantic Bottlenose Dolphin, Tursiops Truncatus (Cetacea, Onotoceti), Alene A. Minchew

Master's Theses

No abstract provided.