Life Sciences Commons^™

Strength Properties Of Secondary Fibers Repulped Under Various Conditions, David J. Deyoung

Paper Engineering Senior Theses

The inability of fibers to swell to their original extent is probably the largest single factor contributing to strength losses of repulped fibers. This lack of swelling lessens the number and strength of fiber to fiber bonds in the sheet formed. It is this fact which leads to the decreased mullen, tensile and stretch of the sheet, and the increased tearing resistance. This paper is a study of the effects of temperature, pH and surfactants on the strength properties of secondary fibers. It was shown that a surfactant is very detrimental to strength properties. While not affecting some strength properties, …

The Role Of The Suprapharyngeal Ganglia Of Lumbricus Terrestris In Respiratory Metabolism, John D. Nelson

Masters Theses

No abstract provided.

Personnel Training And Employment Needs Of Hospital Food Services In Tennessee, Moiselle Peay

Masters Theses

Personnel training and employment needs in 25 selected Tennessee hospitals were studied. Information from this pilot research will be used to develop methods and procedures for conducting similar studies of the food service industry in the future.

Following a preliminary survey by mail to identify the sample desired, personal interviews were scheduled with the hospital administrator and the food service manager in each of the selected hospitals.

Six major categories of personnel were studied: (1) managerial, (2) supervisory, (3) clerical, (4) food preparation workers, (5) food service workers, and (6) food sanitation workers. For each category, food service managers indicated …

Environmental Modification Of Bluegill (Lepomis Macrochirus Rafinesque) In Chilhowee, Loudon, And Norris Reservoirs, Tennessee, Edward Bartlett Smythe Ii

Masters Theses

This thesis reports the results of an investigation of environmental modifications of bluegill (Lepomis macrochirus Rafinesque) in Chilhowee, Loudon, and Norris Reservoirs. The three reservoirs are located in the Tennessee River drainage system.

The investigation was carried out between the spring of 1968 and the fall of 1969. Collecting was done by angling using both natural and artificial bait.

The evidence obtained by the investigation indicated significant differences occurred in the meristic and morphometric characters of the three bluegill populations when the data was tested statistically. It is concluded that the differences detected were probably due to environmental forces, …

Performance Of Feeder Heifers Fed Corn Silage Treated With 10, 15 And 20 Pounds Of Urea Per Ton, Kadhim Abdul Ruhman

Masters Theses

The purpose of this experiment was to determine if the amount of urea could be increased above 10 pounds per ton of corn silage without adversely affecting the acceptability of the silage or the feedlot performance of feeder heifers.

One hundred and eight feeder heifers with an average weight of 450-500 pounds were involved in a two-year experiment conducted at the University of Tennessee's Blount Farm, Knoxville. Three treatments with 10, 15 and 20 pounds per ton of urea treated corn silage were used in this two-year study.

In both trials, there were three replications (pens) per treatment with six …

Performance And Carcass Characteristics Of Feeder Heifer Calves Fed Different Amounts Of Concentrates With Urea-Limestone Treated Corn Silage, Gordon Bobby Idol

Masters Theses

Two feeding trials, one in 1967-68 and the other in 1968-69, were conducted at the University of Tennessee's Blount Farm to determine the effect of feeding different amounts of concentrates with urea-limestone treated corn silage on the performance and carcass characteristics of feeder heifer calves. A total of 288 animals were involved in the study. Treatments included delaying the feeding of a 6 lb. concentrate supplement for 0 (control), 56, 84, 112, 140 and 168 days during a period of high roughage feeding. Two other treatments involved the feeding of 2 or 4 lb. of concentrate during the entire roughage …

A Comparison Of Climatic Elements At Four Elevations In The Great Smoky Mountains National Park, Luther Allin Stephens Jr.

Masters Theses

Between January 1, 1947, and December 31, 1950, hourly temperature and relative humidity and daily precipitation and cloud cover data were collected at the 1,460 ft., 3,850 ft., 5,000 ft., and 6,300 ft. elevations in the Great Smoky Mountains National Park. These four years were part of a period of data collection extending from January, 1946, through March, 1951. These data were processed by a digital electronic computer, IBM 7040, under the control of data summary and potential evapotranspiration programs. Selected statistical tests were employed to compare the similarity of variation in some monthly mean values or to determine the …

Characterization Of Some Unidentified Components In Aorta Lipids, Max Elvin Royer

Masters Theses

No abstract provided.

A Taxonomic And Ecological Study Of The Desmids Of Lily Lake, James L. Pederson

Theses and Dissertations

During the summero f 1964 a taxonomica and ecological study was made of the desmids (microscopic green algae) found in Lily Lake. The study site is a subalpine lake in the Wasatch National Forest of the Uinta Mountains, Utah. The lake is located about one-half mile west of Trial Lake at an elevation of approximately 10,000 feet. The lake is an acidic, cold, lentic bog pond characteristic of this region. Desmids were collected at weekly intervals from seven sampling sites. The water temperature, pH, dissolved oxygen, light conditions and length of day from sunrise to sunset were recorded at the …

Discrimination Reversal Learning As An Index Of Memory In Spermophilus Tridecemlineatus., Waneta Kay Coester

Biology ETDs

Spermophilus tridecemlineatus were trained to solve a simple visual discrimination problem. Following a 15-day non-training period the ground squirrels were trained on-a series of five discrimination reversal problems. Criterion and non-correction procedures were followed during original and reversal training. During the non-training period one half of the subjects (Group I) remained in the training laboratory and the remainder of the animals (Group II) hibernated.

It was possible to train the animals to solve the original discrimination and the reversal problems. No statistically significant differences were observed between performances on consecutive problems. However, differences approaching statistical significance were observed between performances …

The Effect Of Exercise On Metabolic Rate With Time In Overweight And Normal Weight Subjects, Roberta Jewell Keswick

Loma Linda University Electronic Theses, Dissertations & Projects

Previous studies in the Lome Linda University laboratory showed that obese subjects on an exercise program lost approximately one pound more per week as compared to a non-exercise group. Energy expenditure calculations of the exercise did not account for the total caloric deficit required to lose the additional pound. The present study was designed to investigate changes in BMR and metabolic rate with time for normal weight and overweight subjects involved in a practical exercise program. The relationship of changes in BMR and metabolic rate in coping with the problems of obesity were also studied.

Fifteen subjects, eight overweight and …

The Effect Of Photoperiod On The Diurnal Fluctuations In Photosynthetic Rate Of Two Species Of Marine Phytoplankton, Richard Allmon Smith

Master's Theses

Photosynthetic rates were measured under constant conditions over a 24 hour period for cultures of Skeletonema costatum and Amphidinium carterae grown under various light - dark regimes. Photosynthetic rate fluctuated for both species under all photoperiods except for A. carterase under 8 hours light per day. Maximum photosynthetic rates occurred generally in the middle of the. light period and minimum rates.in the middle of the dark period. The ratio of maximum to minimum rates, or Pmax/min, differed significantly under the various photoperiods. Pmax/min values . for A. carterae were significantly greater than for s. costatum. The greatest Pmax/min for S …

Solubility Characteristics Of Residual Collagen As Related To Tenderness Of Beef Semimembranosus Roasted At 200O And At 300OF, Cheryl Ann Whetstone

Masters Theses

The effects of two heat treatments on cooking time, total cooking losses, energy consumption, meat tenderness, and collagen-solubility in 0.1 N NaOH and Ringer's solution were studied using five pairs of top round roasts obtained from three Hereford steers. One roast from each pair was cooked at 200⁰F and the other at 300⁰F to an end point of 158⁰F in the center of the semimembranosus muscle.

Semimembranosus muscles roasted at 200⁰F required longer cooking times per pound, had higher total cooking losses, consumed more energy, and were more tender than pair mates …

Nutrition Field Observations And Experiences In The State Of Maryland, Kay Hudson Beavo

Masters Theses

This thesis is a resume of the author's field experience in public health agencies in Maryland. The field placement was planned to supplement previous work experience and graduate study toward a Master of Science Degree in Public Health Nutrition. The field placement was arranged to provide an opportunity for the student to gain an understanding of the interrelationships of nutrition programs and services at different governmental levels.

Two weeks were spent in the Maryland State Department of Health and in the Baltimore County Health Department, and four weeks were spent in the Baltimore City Health Department which is responsible for …

Mandibular Nerve Regeneration Through Solid And Canalized Bone And Plaster Grafts, Lawrence D. Day

Loma Linda University Electronic Theses, Dissertations & Projects

Utilizing an extra-oral approach and sterile technique, left mandibular ostectomy was performed on five miniature pigs. The segment removed was 3 cm long and included the inferior border, mandibular canal and, in some cases, apices of a molar tooth.

Bone and plaster grafts (one solid and one canalized of each) were used to fill these defects. The fifth was left with no graft.

The objective was to learn the effect of each of these procedures on regeneration of the mandibular nerve across the defect. It was hypothesized that canals through the grafts would facilitate regeneration.

X-rays were taken periodically. The …

Kinetic Studies Of The Cell Elongation Phenomenon In Etiolated Pisum Stem Segments, Grant M. Barkley

Masters Theses

The short-term growth response of etiolated pea stem segments (Pisum sativum L., var. Alaska) was investigated using a high-resolution growth recording device. The immediate effect of treatment with indoleacetic acid (IAA) is an inhibition of growth. This inhibition lasts about 10 minutes and then the rate of elongation rises abruptly to a new steady rate about 4 times the rate of elongation before auxin treatment. This rapid steady rate of elongation, however, continues for only about 22 minutes before declining suddenly to a lower steady rate of growth about 2 times the rate of elongation before the addition of auxin. …

Populations Of Some Mammals Of Oak Forests In Southwestern Michigan, James R. Hodgson

Masters Theses

No abstract provided.

The Migratory Route Of Toxocara Canis In Gerbils, Thomas Carl Baker

Theses and Dissertations

Toxocara canis (Werner, 1782) is the round worm most frequently found in dogs. From surveys in the United States, approximately 40-100% of young dogs and 5-70% of older dogs are infected with this parasite. Of 97 adult dogs surveyed in Provo, Utah, in 1968, 17. 5% were infected with T. canis (Fox, personal communication). Adult dogs become infected by ingesting food contaminated with the infective eggs from this parasite. Puppies are most frequently infected prenatally from their mother (Nifontov, I 949; Yutuc, 1949; Sprent, 1958; Webster, I 958; Douglas and Baker, 1959; Scothorn, Koutz and Groves, 1965; Wiseman. 19 69).

Comparative Effects Of Carbon Dioxide On Coccidian Oocysts From Five Different Host Species, Thomas David Bunch

Theses and Dissertations

Excystation, as applied to the coccidia, is the process by which sporozoites are released from sporocysts and oocysts. Although this process has long been a subject of interest and study, there still remains considerable disagreement among investigators as to the mechanism by which the process occurs and the factors which are involved.

The Effect Of Chemical Adjuvants Of The Survival Of The Free-Living Stages Of The Gastrointestinal Nematode, Haemonchus Contortus, Anthony T. Chang

Theses and Dissertations

Considerable research has been done on the influence of various chemical adjuvants, such as glycerol and dimethyl sulfoxide (DMSO) on the survival of protozoan organisms. (Levine and Marquardt, 1955; Levine, Mizell and Houlahan, 1958; Levine, et al. 1962; Levine and Andersen, 1965, 1966; Fitzgerald and Levine 1957 1 1961; Diamond, 1964). Considerably less work has been done on metazoan parasites. The effects of various chemical adjuvants on the survival of Haemonchus contortus, the large stomach worm of sheep, at extremely low temperatures has not been reported. The purpose of this research was to determine if different concentrations of chemical adjuvants …

Winter Behavior And Population Dynamics Of American Eagles In Western Utah, Clyde C. Edwards

Theses and Dissertations

The large size, extensive range, and irnporta.nt corrnnunity role of the Golden Eagle (Aguila chrysaetos L.) and the Bald Eagle (Haliae-etus leucocephalus L.) attract considerable scientific interest. Sorne aspects of their life history have been investigated and reported in detail, but their rapidly declining numbers (Sprunt and Ligas 1966, Cottam 1961) necessitate new investigations into all phases of their life history and particularly into population dynamics.

An Investigation Of A Mycorrhizal Association On Opuntia Polyacantha, R. Craig Stutz

Theses and Dissertations

Roots of Opuntia, polyacantha Haw. from Juab County, Utah were found to be nodulated. An anatomical study of the nodulated roots showed them to be ectotrophic mycorrhizae. Fusarium poae (Peck) Wollenweaver was found associated with the nodules both as an epiphyte and an endophyte. However, reinfection with this organism failed to induce subsequent nodulation. Under certain conditions the roots of o. polyacantha are able to overcome the mycorrhizal infection and elongate. It is not uncommon for several branch roots to originate from a single nodule. It is suggested that the fungus-root association found in o. polyacantha represents an early stage …

Ultrastructural Investigations Of Tilletia Caries Teliospores, James Vincent Allen

Theses and Dissertations

The purpose of this study was to investigate the ultrastructure of Tilletia caries teliospores. Specimens were prepared for viewing in the electron microscope by freeze-etching and thin-sectioning techniques. Thin-sectioning techniques gave excellent results with the teliospore walls and the lipid bodies within the teliospore but failed to adequately fix the membranes and internal organelle systems. Micrographs of Tilletia caries teliospores prepared using thin-sectioning show three major wall layers and two partition wall layers and abundant lipid bodies. The freeze-etch method of spore preparation proved superior to the thin-sectioning used in this study to reveal the internal organelle systems of the …

Surface Characteristics Of Conidia From Monosporous Cultures Of Penicillium Digitatum And Aspergillus Nidulans Var. Echinulatus, Raymond Kunito Fuji

Theses and Dissertations

The purpose of this investigation was to evaluate the possible taxonomic significance of the "rodlet" patterns and spore wall configurations of conidia from monosporous cultures of Penicillium digitatum Saccardo and Aspergillus nidulans Eidam var. echinulatus Fennell & Raper. Freeze-etching the conidiospores from single spore isolates of these fungi revealed that spore wall patterns and configurations vary much too greatly to be of taxonomic importance on the strain and subspecies level. Environmental factors and genetic influences are discussed as possible mechanisms causing the variations of the spore wall configurations. A membrane-like structure that covers the "rodlet" patterns and which hinders spore …

Phylogenetic Relationships Of Purshia Tridentata And Cowania Mexicana, Stewart C. Sanderson

Theses and Dissertations

Because of the greatly increased supply of genetic variation which it provides, introgression is of great importance in determining both the rate and the direction of evolution. Hybridization between the genera Cowania and Purshia provides an excellent model for demonstrating the various products which might be expected from introgression. The present study is an attempt to further investigate phylogenetic relationships of Cowania mexicana and Purshia tridentata by use of cytological and biochemical techniques.

Food Habits Of Dicamptodon Ensatus And Associated Fish Species Of Maratta Creek, Washington, Authur L. Antonelli

All Master's Theses

Three cold-blooded vertebrates, Dicamptodon ensatus, Cottus tenuis, and Salmo gairdneri were investigated as to food habits for a period of one year. The existence of competition between these animals for food was determined by means of stomach analysis. The results were compared relative to each vertebrate and the bottom fauna procurred from the stream. It was shown that the food habits of D. ensatus and S. gairdneri were diverse enough to warrant partial exclusion on the basis of food. C. tenuis demonstrated selectivity and was shown to be under competitive stress from the other two species.

Field Experiences And Observations With The Nutrition Division, Maternity And Infant Care Project No. 551, Mobile County, Alabama, Mildred Louise Walker

Masters Theses

The major purpose of the field experience in public health nutrition with the Maternity and Infant Care Project No. 551 in Mobile County, Alabama was to facilitate the integration of academic knowledge and practical experience on a professional level. The experiences and observations during eight weeks in this agency have been analyzed in terms of the writer's objectives.

The writer gained a better understanding of the operation and functions of a health project and the role of a public health nutritionist within the organization by working with other disciplines within the agency. As a project. she planned and developed a …

A Revision Of The Genus Eriogonum (Polygonaceae), James Lauritz Reveal

Theses and Dissertations

The genus Eriogonum is one of North America's largest and most complex group of plants. Found primarily in the western United States where its members are a common feature of the landscape, its overall range is from Alaska to central Mexico and from the Pacific coast to the Atlantic coast. The genus is composed of eight subgenera and 226 species. The purpose of the dissertation is to present an abbreviated revision of the genus following the style format of the North American Flora series. Brief taxonomic descriptions and keys are provided along with details of each taxon's geographical distribution and …

Age And Growth Of White Bass, Roccus Chrysops (Rafinesque), In Mud Lake, Near Provo, Utah, Frederick Edward Trapnell

Theses and Dissertations

This study was conducted to obtain information that could be used in the management of the Utah and Mud lake white bass fishery. It also provides data for evaluating the effect of the loss of Mud Lake on the white bass utilizing it. Determination of age, growth rate, and coefficient of condition of the Mud lake white bass were objectives in this study. The occurrence of organisms in the digestive tracts of 64 white bass as well as the movement of white bass into and out of Mud Lake were also studied. Hoop nets, a continuous mesh gill net, and …

A Study Of Folic Acid Dependent Reactions In Bovine Brain, Dillard Spencer Broderick

Theses and Dissertations

The enzymatic interconversion of serine to glycine and N5, N10-methylene tetrahydrofolate to N5 -methyl tetrahydrofolate have been studied in a cell-free system derived from bovine brain. A partial purification of serine transhydroxymethylase and N5, N10 -methylene tetrahydrofolate reductase has been achieved by ammonium sulfate fractionation, protamine sulfate fraction, and by various column chromatography procedures. The two enzymes studied catalyze sequentially the reductive transfer of the hydroxymethyl group of serine to the N5 position of tetrahydrofolate forming N5 -methyl tetrahydrofolate. The products of these reactions were assayed by the incorporation of C14 from a one-carbon precursor i.e., L-beta-(C14)-serine, or N5 -methyl …