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

Life Sciences Commons

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

PDF

Theses/Dissertations

1978

Discipline
Institution
Keyword
Publication

Articles 1 - 30 of 275

Full-Text Articles in Life Sciences

Fish Feeding-Habit Studies From Tomales Bay, California, Stephen Robert Karl Dec 1978

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

University of the Pacific Theses and Dissertations

No abstract provided.


Den Ecology Of Black Bears (Ursus Americanus) In The Great Smoky Mountains National Park, Kenneth Gregory Johnson Dec 1978

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 last ...


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 Dec 1978

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 ...


A Demographic And Behavioristic Description Of Visitors To Cherokee, N.C., Shirley Louise Hyatt Dec 1978

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 ...


Dna Replication In Mesophilic And Thermophilic Bacteria, Pawan K. Gupta Dec 1978

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

Dissertations

No abstract provided.


The Influence Of Food On Induction Of Males In Daphnia Pulex, Paul Henry Schreuder Dec 1978

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

Master's 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 ...


Chromosome Behavior And Cytokinesis Of Nezara Sp. And Lygaeus Sp., Mohamed Barka Marwan Dec 1978

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

Master's Theses

No abstract provided.


The Distribution And Abundance Of Tubificids In The Little Calumet River, Gladys Moreno Dec 1978

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

Master's Theses

No abstract provided.


An Investigation Of Nitrogen Utilization As A Factor In The Size Selective Feeding Habits Of Lepomis Macrochirus, Stephen M. Hinckley Dec 1978

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

Master's Theses

No abstract provided.


Resource Use, Habitat Selection, And Seasonal Activity Of A Chihuahuan Snake Community, Robert Paul Reynolds Nov 1978

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 ...


An Organic Energy Budget For The New York State Barge Canal, Allan R. Amering Nov 1978

An Organic Energy Budget For The New York State Barge Canal, Allan R. Amering

Biology Master’s Theses

An annual energy budget is presented for the New York State Barge Canal, a first order man-made waterway in western New York. The ecosystem approach, in which all input and output of energy as organic matter are measured, is used to describe the energy flow in an 1130-meter segment of the canal. The annual input of energy to the system is 38.1 x 109 kcal/m2. Over 99% of this is allochthonous from upstream areas. Autochthonous input from primary producers accounts for less than 0.1% of the total energy available to the-system. Meteorologic inputs (litter and ...


A Study Of Lymphocyte Subpopulations In Allergic And Asthmatic Patients, Cleora W. Barnwell Oct 1978

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 Oct 1978

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

Retrospective Theses and Dissertations

No abstract provided.


Cytochemical And Biochemical Analysis Of Microsclerotia Development In Veriticllium Dahliae, Hazel Taylor Aug 1978

Cytochemical And Biochemical Analysis Of Microsclerotia Development In Veriticllium Dahliae, Hazel Taylor

ETD Collection for AUC Robert W. Woodruff Library

Verticillium dahliae, an asexual fungus that produces unicellular conidia as its primary mode of reproduction, forms thick-walled melanized microsclerotia cells (MS) which serve as survival structures. These large globose budding structures are characteristic of older hyphal regions. In order to observe changes at the cellular level during MS development hypha 1 tips were placed into polygalacturonic acid medium (PGAM) which induces synchronous development of microsclerotia. Samples were taken from the medium at 24 h intervals up to five days and prepared for phase contrast and electron microscopic observations. Elongation at hyphal tips and rapid conidiation was followed by a brief ...


An Ultrastructural Study Of Intramuscular Melanocytes In Pet/Wmr Mice, Charles August Gomer Aug 1978

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 ...


The Quality Of Storm Runoff From Different Kinds Of Land Surfaces In The Drainage Basin Of Westhampton Lake, Richmond, Virginia, Margaret Emil Coppedge Aug 1978

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 Aug 1978

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 ...


Identification And Economic Analysis Of Alternative Soybean Production Systems, William Alan Miller Aug 1978

Identification And Economic Analysis Of Alternative Soybean Production Systems, William Alan Miller

Masters Theses

The objectives of this study were to identify alternative soybean production systems used by Tennessee farmers in 1976 based on alternative combinations of cropping practices and planting methods and to develop estimates of the resource requirements and the costs and returns of each identified cropping-planting system.

A mail survey of randomly selected West Tennessee farm operators was used to identify the following six soybean cropping-planting systems: (1) single crop-row crop, (2) single crop-grain drill, (3) single crop-broadcast, (4) double crop-row crop, (5) double crop-grain drill, and (6) double crop-no till. Comparison of the six systems involved tabulation of survey data ...


A Procedure For Determination Of Total Sulfur And Inorganic Sulfate Content Of Food Stuffs, Margaret Steele Rumbley Aug 1978

A Procedure For Determination Of Total Sulfur And Inorganic Sulfate Content Of Food Stuffs, Margaret Steele Rumbley

Masters Theses

A procedure for determination of total sulfur and a procedure for determination of inorganic sulfate content of the edible portions of foodstuffs common to the American diet were investigated. The test food was New York State variety green cabbage. Total sulfur (as sulfate) was determined by the Parr sulfur bomb atomic absorption spectrophotometric method. The determination was made with and without added sodium sulfate standard. Good recovery and precision, 101.4 ±2.3%, were obtained by this method. An attempt was made to determine total sulfur (as sulfate) as the sum of the four sulfur components: inorganic sulfate, organic sulfate ...


Movement Ecology And Activity Behavior Of Black Bears In The Great Smoky Mountains National Park, David L. Garshelis Aug 1978

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 size of ...


Distribution And Characteristics Of Balsam Woolly Aphid Infestations In The Great Smoky Mountains, C. Christopher Eagar Aug 1978

Distribution And Characteristics Of Balsam Woolly Aphid Infestations In The Great Smoky Mountains, C. Christopher Eagar

Masters Theses

The balsam woolly aphid was inadvertently introduced into North America in Maine around 1900 and has subsequently spread throughout the eastern spruce-fir forests. Within the past 20 years the aphid has become a serious pest of Fraser fir in the Southern Appalachians, causing concern for the scenic and scientific resources of the spruce-fir forests. Fraser fir is highly susceptible to attack by the aphid with mortality occurring within 2 to 5 years following colonization. This rapid mortality in combination with the phenomenal reproductive potential of the aphid threatens the existence of Fraser fir. Investigations were conducted within the Great Smoky ...


Comparison Of Forest Cover Prior To And Following Disturbance In Two Areas Of The Great Smoky Mountains National Park, Weaver H. Mccracken Iii Aug 1978

Comparison Of Forest Cover Prior To And Following Disturbance In Two Areas Of The Great Smoky Mountains National Park, Weaver H. Mccracken Iii

Masters Theses

Prelogging forest cover and the nature and intensity of logging disturbance for two areas in the Great Smoky Mountains National Park were characterized using written records, photographs, interviews and, where available, virgin stands on similar sites. Present seral position and stand character were determined from fixed-area plots established on sties for which previous forest cover and intensity of disturbance had been determined.

A low- to mid-elevation hardwood forest occupying a north-facing drainage on the Tennessee side of the Park was determined to have been mixed mesophytic in character prior to logging and was most intensively disturbed by skidder logging near ...


Aspects Of The Organic Carbon Cycle On Walker Branch Watershed: A Study In Land/Water Interaction, Charles Edward Comiskey Aug 1978

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 ...


Zinc Uptake In Loblolly Pine Seedlings, Victor Zillmer Aug 1978

Zinc Uptake In Loblolly Pine Seedlings, Victor Zillmer

Electronic Theses and Dissertations

Zinc concentrations in the root, terminal growth, stem, and needles of loblolly pine (Pinus taeda L.) were measured in 72 seedlings grown in washed sand, fertilized with Zn(N03)2. Zinc treatment periods were early spring, late spring, and summer. Zinc uptake was the greatest in early spring. Zinc nitrate fertilizer and remaining soil zinc at treatments end had no effect on mycorrhizae, height, or diameter growth. Linear and multiple regressions were derived using residual soil zinc and treatment zinc that can predict zinc concentrations in different plant parts that have r values from .7440 to .8170. Linear regressions for ...


A Survey Of Nine Common Laboratory Compounds As Causative Agents Of Ciliostasis In Tracheal Explants From Mice, Josie Marshall Fletcher Aug 1978

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

Master's Theses

No abstract provided.


Mammalian Succession On Lake Michigan Sand Dunes, John M. Olson Aug 1978

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

Master's Theses

No abstract provided.


Anionic Transport In Nitella Clavata, Bonnie L. Bower Jul 1978

Anionic Transport In Nitella Clavata, Bonnie L. Bower

Biology Master’s Theses

This study examines aspects of anion transport, focusing on Cl-, No3- and So4-2 in Nitella clavata. The researcher measures the uptake of radioactive Cl- in the presence/absence of a hexose in order to determine if glucose inhibits Cl- influx. The author grew Nitella clavata in open tanks of culture solution, with a light intensity of 100 foot-candles at the cultures’ surface. Only the first, second, or third intermodal cells proximal to the apical tip were used. Harvested cells were then conditioned from one to seven days under controlled conditions. First, the researcher used titration to measure ...


A Test Of Cultural Treatments Selected To Improve The Chemical And Physical Characteristics Of Reclaimed Surface Mine Spoil For The Growth Of Loblolly Pine In East Tennessee, Thomas L. Simpson Jun 1978

A Test Of Cultural Treatments Selected To Improve The Chemical And Physical Characteristics Of Reclaimed Surface Mine Spoil For The Growth Of Loblolly Pine In East Tennessee, Thomas L. Simpson

Masters Theses

Three surface mine spoil areas in East Tennessee were selected for testing the influence of the State reclamation requirements and selected supplementary treatments on the survival and growth of pines recommended for planting on various sites. A high elevation (2,800 feet) test near Caryville, Tennessee, was discarded because of poor survival of white pine and site modification by contractors working in the area.

Fertilizer tests on two established loblolly pine plantations, one on new and the other on old spoil from mining the Sewanee coal seam near Cagle, Tennessee (1,850 feet), indicated that N additions of both 50 ...


Are Pollinators Exerting Selection Pressure On The Azalea Hybrids On Gregory Bald?, Clinton Victor Kellner Jun 1978

Are Pollinators Exerting Selection Pressure On The Azalea Hybrids On Gregory Bald?, Clinton Victor Kellner

Masters Theses

Gregory Bald is renowned for an azalea hybrid swarm which contains a very diverse array of flower colors and forms. This report involves the study of the flower constancy of the pollinators to the different azalea flower types. The flower type classification is based on the floral morphology, color and presence of odor. The azalea species involved in the hybrid swarm are Rhododendron bakeri (Lemon and McKay) Hume, R. aborescens (Pursh) Torrey and R. viscosum (L.) Torrey. Pollinators' constancy to flower type and pollinators' preference for flower type were observed on square plots that contained two or more flower types ...


The Role Of Allelopathic Interference In The Maintenance Of Southern Appalachian Heath Balds, Robert Edward Gant Jun 1978

The Role Of Allelopathic Interference In The Maintenance Of Southern Appalachian Heath Balds, Robert Edward Gant

Doctoral Dissertations

Allelopathic interference seems to be an important mechanism in the maintenance and persistence of southern Appalachian heath bald communities. Comparative analyses were conducted on two heath balds located in the Balsam Mountains of western North Carolina to distinguish phytotoxic characteristics that enhance persistence. Field studies revealed that one community was a mixed heath bald dominated by Rhododendron catawbiense and the second resembled an immature spruce-rhododendron forest heath dominated by Rhododendron maximum and Picea rubens.

Caffeic acid, gallic acid, gentisic acid, hydroquinone, p-hydroxybenzoic acid, 2-pinene, phloroglucinol, rhododendrol, and vanillic acid were isolated and identified from canopy drip, leaves, litter, roots, and ...