Life Sciences Commons^™

Fish Feeding-Habit Studies From Tomales Bay, California, Stephen Robert Karl

University of the Pacific Theses and Dissertations

The Bat Ray, Myliobatis californica Gill, occurs from Oregon to the Gulf of California and is common in California bays during the spring and summer. MacGinitie (1935) observed that during its feeding activities, the Bat Ray can dig channels up to 1 meter wide, 50 cm deep and 4.5 meters long in benthic substrates. In intertidal sand flats in Tomales Bay, California, circular pits up to 1 meter in diameter and 20 cm in depth are made by Bat Rays in late summer. In some areas over 50% of the sand flat surface is covered with Bat Ray pits. This …

Dose Patterns For ¹⁰⁶Ruo₄ Inhaled By Fischer-344 Rats, Gene E. Runkle

Biology ETDs

Ruthenium-106 is an abundant fission product radionuclide in the nuclear fuel cycle which has potential for release as ruthenium tetroxide. This study was designed to provide additional data needed to adequately assess the risk for humans potentially exposed to ¹⁰⁶RuO₄vapor. Fiscner-344 rats were given a nose-only exposure to ¹⁰⁶RuO₄ vapor to determine its distribution and retention patterns. The largest percentage of the initial body burden was found in the nasopharyngeal region of the respiratory tract. Ruthenium-106 deposited in this region was rapidly cleared and excreted in the feces. Less than 1% of the initial body …

Chromosome Behavior And Cytokinesis Of Nezara Sp. And Lygaeus Sp., Mohamed Barka Marwan

Masters Theses

No abstract provided.

The Effects Of Recycling On Fiber Characteristics, Michael B. Bekes

Paper Engineering Senior Theses

Recent trends in recycling indicate that future use will increase. This increase will bring a demand for the secondary fiber. Many technical questions have to be answered before recycling becomes an economical process. One of these questions is how the recycling process affects fiber characteristics. This thesis will deal specifically with this question.

"Controlled Overdrying: Effects On Some Physical Properties Of Fine Paper", John T. Collins

Paper Engineering Senior Theses

The purpose of this study was to determine the effects of certain drying variables on some physical strength properties when these variables were controlled to bring about overdrying conditions. The variables under study were contact time on the dryer can (% moisture) and different percentage hardwood-softwood compositions. From the study it was discovered that overdrying actually increases tensile values but mullen and tear values did indeed decrease.

The object of the following report was to see if there was a decrease, if any, in certain physical properties and to what degree. If overdrying a sheet actually decreases the physical properties …

The Effect Of Pigments In The Flotation De-Inking Of Newsprint, Harold M. Cody

Paper Engineering Senior Theses

This study was performed to determine the effect of the addition of pigments in the flotation de-inking of newsprint. It has been proposed that pigments aid in the flotation and removal of ink. Two pigments were investigated: talc and diatomaceous earth.

The addition of talc caused the brightness of the sheets to drop because the talc became heavily concentrated with ink. The addition of diatomaceous earth to the cell had no effect upon the flotation and removal of the ink. Therefore the addition of pigments to improve ink flotation and removal cannot be justified.

Variables Affecting The Drainage Test, Jeffrey S. Honour

Paper Engineering Senior Theses

Certain variables affecting the Canadian Standard Freeness Test were investigated. Variables investigated included the zeta potential, pH, chemical type, and concentration. Chemicals used were NaCl, CaCl, AlCl , and SnCl, 5H₂O on the acid side. Chemicals used on the alkaline side included KCl, K₂S₄ and K₂HPO_4.. pH values were 4.5, 5.5, 6.5, 7.5, 8.5, and 9.5. Concentrations used were 1 x 10^-3M, 3 x 10^-3M, 5 x 10^-3M, 7 x 10^-3M, 9 x 10^-3M, 1.1 X 10^-2M, 1.3 x …

The Distribution And Abundance Of Tubificids In The Little Calumet River, Gladys Moreno

Masters Theses

No abstract provided.

Dna Replication In Mesophilic And Thermophilic Bacteria, Pawan K. Gupta

Dissertations

No abstract provided.

An Investigation Of Nitrogen Utilization As A Factor In The Size Selective Feeding Habits Of Lepomis Macrochirus, Stephen M. Hinckley

Masters Theses

No abstract provided.

The Influence Of Food On Induction Of Males In Daphnia Pulex, Paul Henry Schreuder

Masters Theses

Introduction

Daphnia pulex Leydig (Crustacea, Cladocera) is a common component of the zooplankton of freshwater lakes and ponds. Its importance in the aquatic trophic structure as food for small fish has long been recognized.

Typical populations of daphnia consist almost exclusively of females. Under favorable conditions this situation is perpetuated by parthenogenetic reproduction. Eggs produced in this manner are referred to as parthenogenetic or summer eggs. When stressed by falling temperatures, drought, overpopulation, or starvation, populations shift to sexual.reproduction. Parthenogenetic eggs are produced which develop into males. Other eggs known as ephippial or winter eggs are also produced, which after …

A Demographic And Behavioristic Description Of Visitors To Cherokee, N.C., Shirley Louise Hyatt

Masters Theses

The identification of demographic and behavioristic characteristics of summer visitors to Cherokee, North Carolina, which would provide a basis for marketing decisions, was undertaken in this research. A survey of visitors was conducted in Cherokee during the summer season to determine characteristics of the visitors.

Data were collected with a self-administered questionnaire that was distributed at sixteen businesses which proportionately represented craft shops, motels, restaurants, campgrounds, amusement attractions, and cultural attractions. Distribution points, dates, and times were randomly selected. Analysis of the data revealed behavioral and demographic characteristics of the summer visitor and behavioral influences on demographic segments.

The strongest …

Den Ecology Of Black Bears (Ursus Americanus) In The Great Smoky Mountains National Park, Kenneth Gregory Johnson

Masters Theses

Radiotelemetry was used to locate winter dens, determine the denning period, and gather observations on the denning behavior of black bears (Ursus americanus) in a 42,800 ha portion of the Great Smoky Mountains National Park (GSMNP). After spring emergence, dens and the site parameter were measured and the vegetation sampled. Random transects and factor and discriminant function analysis were used to determine the availability of dens and denning habitat.

The denning period averaged 94 days with most bears entering dens between the last week in December and the first week in January and emerging from dens between the …

Composition And Structure Of Replacement Forest Stands Following Southern Pine Beetle Infestations As Related To Selected Site Variables In The Great Smoky Mountains, Nathaniel White Kuykendall Iii

Masters Theses

Stand composition and eleven site factors were sampled in 49 stands in the Great Smoky Mountains in which the pine overstory had been killed by the southern pine beetle. Replacement community types were determined using cluster analysis of relative densities for 21 common species. absolute densities for total stems, total pine, total oak, and eight individual species in the overstory, understory, and reproduction strata were related to selected site and vegetation variables by correlation and stepwise multiple regression.

Infestations greatly reduced the importance of pine in all replacement stands, converting most pine dominated stands to mixed pine-hardwood. Pine reproduction was …

Resource Use, Habitat Selection, And Seasonal Activity Of A Chihuahuan Snake Community, Robert Paul Reynolds

Biology ETDs

Food habits and habitat selection were investigated in a snake community 1n northeastern Chihuahua, Mexico, from 1975 to 1977. A total of 418 snakes (20 species) was collected along Highway 16 from Villa Aldama to El Pastor. Examination of snake capture sites for the plant species present, and a study of structural characteristics of the vegetation and topographic features showed that snakes exhibited distinct habitat preferences. Rodent species present and their relative densities were assessed by 5400 trap nights at 18 trap stations.

Digestive tracts of 351 snakes of 16 species were examined and they yielded 153 food items. Rodents …

A Floristic Assessment Of The Datil Mountains, Reggie A. Fletcher

Biology ETDs

The Datil Mountains of west-central New Mexico were selected for a floristic inventory and analysis because of the lack of previous study in this section of the state. The location of the study area in relationship to the Basin and Range, Southern Rocky Mountain, and Colorado Plateau physiographic provinces was a major factor in determining the initial need for floristic work in the Datil Mountain area. An annotated checklist of the vascular flora of the study area was compiled. For those 590 collected taxa, available information was compiled which could serve as a useful tool for land management in this …

The Effect Of Developmental Temperature On Morphology, Energy Metabolism, Growth Hormone And Thyroid Stimulating Hormone In Long-Evans Rats, Dana Elizabeth Quinn

Dissertations and Theses

Long-Evans rats were raised from birth to eight weeks of age at 5°C, 20°C and 30°C. Blood was taken from animals two to eight weeks of age and assayed for growth hormone and thyroid stimulating hormone. The 30°C reared rats were found to have the longest ear, tail and hind limbs, followed by the 20°C reared rats. The 5°C rats were found to have the shortest ear, tail and hind limb. The 30°C and 5°C reared rats were found to have similar masses at the termination of the experiment. The 20°C reared rats had the smallest mass. Differences in size …

Immunization And Infection Of Rhesus Monkeys With Plasmodium Knowlesi: Evaluation Of Assays For Immunity, Robert Charles Jost

Biology ETDs

This study was done to test the efficacy of 3 malarial vaccine preparations using merozoite, schizont, and French press antigens (Ags). The experiment utilized the Plasmodium knowlesi - rhesus monkey system. In conjunction with this study the lymphocyte transformation test and the solid phase radioimmunoassay (RIA) were evaluated as in vitro assays for protective cell-mediated and humoral immune responses, respectively. Delayed dermal hypersensitivity reactions to P. knowlesi and the proportion of B and T lymphocytes were also examined by rosette formation. Lymphocytes from Ag-immunized monkeys showed greater in vitro blastogenic responses to P. knowlesi French press Ag than did lymphocytes …

A Study Of Lymphocyte Subpopulations In Allergic And Asthmatic Patients, Cleora W. Barnwell

Retrospective Theses and Dissertations

The role of T and B lymphocytes in the human immune response has been studied in allergic and asthmatic patients by many investigators. Theories of suppressed cellular immunity have been reported showing decreased levels of T cells in peripheral blood. Elevated levels of IgE, an antibody, have been reported in these conditions, but not shown to be significant in distinguishing the different types of asthma. A double blind study of 19 allergic and 42 asthmatic individuals was conducted measuring T and B cell levels and IgE levels. The asthmatic group was subdivided into three types, intrinsic, extrinsic and mixed. The …

A Comparative Study Of Growth And Survival In Nestling Mockingbirds And Brown Thrashers, Bette J. Schardien

Retrospective Theses and Dissertations

No abstract provided.

The Fall And Winter Food Habits Of The Black Bear (Ursus Americanus) In The Great Dismal Swamp Of Virginia, Francis Leonard Daniel

Biological Sciences Theses & Dissertations

A study was conducted on the food habits of the black bear (Ursus americanus) in the Great Dismal Swamp of Virginia. A total of four stomachs and 42 scats were analyzed. Four samples were collected from September and October of 1975, and the remainder of the samples were collected from September 1976 to February 1977. The study was conducted to obtain information vital to the management of this species in the Great Dismal Swamp. Vitis spp. was the primary food item during the fall comprising 43% of the total diet, followed by fruits of Diospyros virginiana and Asimina triloba, each …

Ultrastructural Study Of Wound Healing On A Root Planed And Citric Acid Treated Root Surface, Craig Martin Ririe

Loma Linda University Electronic Theses, Dissertations & Projects

It has been shown previously that a root surface which has been scaled, root planed and demineralized by topical application of citric acid in vitro, is dominated by exposed collagen fibrils. The purpose of this study was to examine the mechanism of healing and possible reattachment of soft periodontal connective tissue to the root planed and subsequently acid treated root surfaces and to determine whether new collagen fibrils produced in the connective tissue could attach to these exposed fibrils.

Full thickness tissue flaps were raised and the coronal 4-5 mm of the labial alveolar plate removed over the maxillary incisor …

Aspects Of The Organic Carbon Cycle On Walker Branch Watershed: A Study In Land/Water Interaction, Charles Edward Comiskey

Doctoral Dissertations

Aspects of the organic carbon cycle in a deciduous forest watershed were studied with emphasis on meteorological inputs to the watershed system, transfers of organic material from the terrestrial to the aquatic subsystems, the hydrologic transport of organic carbon in the stream subsystem, and organic outputs from the watershed system via geological vectors.

Transfer of large (> 1 mm) particulate organic material to the heterotrophically based aquatic subsystem occurred primarily as direct leaf fall and blow-in. Annual litterfall was 222.1 g/m² organic carbon, of which leaves contributed 80.6%, fruits and reproductive parts 11.3%, twigs 5.6% and frass 2.5%. Peak …

An Ultrastructural Study Of Intramuscular Melanocytes In Pet/Wmr Mice, Charles August Gomer

Master's Theses

An examination of the lateral head of the gastrocnemius of the PET/Wn!.r mouse was made with an electron microscope. Cells of the perimysium and endomysium were described and the relationship of these cells to muscle cells was characterized. The relationship between melanocytes and muscle cells found in this strain was the major focus. Melanocytes were seen to be present in the perimysium and endomysium with the greatest concentration in the endomysium. Melanocytes of the perimysium appeared segregated from the adjacent tissue by fibroblasts,which surround ed the melanocytes with their cytoplasmic processes, a well as by collagen fibers. Melanocytes of the …

The Quality Of Storm Runoff From Different Kinds Of Land Surfaces In The Drainage Basin Of Westhampton Lake, Richmond, Virginia, Margaret Emil Coppedge

Master's Theses

Samples of runoff were collected during storms from four different areas within the drainage basin of Westhampton Lake, Richmond, Virginia, between October, 1977, and January, 1978. The areas were a residential area, concrete street gutter, asphalt parking lot, and broadleaf forest.

The samples were analyzed for pH, levels of reactive phosphate, nitrate, and turbidity, and their effects on the growth of algae from Westhampton Lake.

The pH of runoff from the residential area, gutter, and forest usually ranged between 6-7 and the parking lot usually ranged between 4-5. Levels of turbidity varied considerably between storms and areas. Runoff from the …

Lactate Dehydrogenase Isozyme Patterns From Five Species Of Snakes : Comparison Of Rattlesnake Vibratory Muscle With Body Epaxial Muscle, Cecil Bernard Cross

Master's Theses

Lactate dehydrogenase (LDH) isozyme patterns of seven tissues in each of five species of snakes are described from their polyacrylamide gel electrophoretic characteristics. The tissues examined included vibratory tail muscle, non­ vibratory tail muscle, body epaxial muscle, heart muscle, whole blood, liver and kidney. The species of snakes included Crotalus adamanteus, C. h. horridus, Agkistrodon piscivorus and Sistrurus miliarius barbouri from the family Crotalidae and Natrix taxispilota from the family Colubridae. These snakes show a decreasing continuum of tail vibratory activity, respectively, to N. taxispilota, which has a non­vibratory tail muscle.

Crotalus adamanteus, C. h. horridus and A. piscivorus have …

An Evaluation Of Permanence Using Wet And Dry Accelerated Aging, Patricia M. Kern

Paper Engineering Senior Theses

Evaluation of a series of paper samples aged using wet and dry accelerated methods showed that there is a definite difference between the two methods.

Electrometric pH and folding endurance provided the best indication of the deterioaration of the paper properties upon aging.

Movement Ecology And Activity Behavior Of Black Bears In The Great Smoky Mountains National Park, David L. Garshelis

Masters Theses

Movements and activity behavior of 29 radio-collared black bears (Ursus americanus) were monitored between July 1976 and December 1977 in the Great Smoky Mountains National Park. Many bears exhibited home ranges with abrupt seasonal changes, especially between summer and fall. The timing and extent of these range shifts were influenced by sex, age and food availability. During good mast years, the fall ranges of many males overlapped considerably in an area of abundant oaks, while during poor mast years, social intolerance may force many subordinate males outside the Park boundaries in search of food. Fall movements increased the …

A Survey Of Nine Common Laboratory Compounds As Causative Agents Of Ciliostasis In Tracheal Explants From Mice, Josie Marshall Fletcher

Masters Theses

No abstract provided.

Mammalian Succession On Lake Michigan Sand Dunes, John M. Olson

Masters Theses

No abstract provided.