Life Sciences Commons^™

Studies Of A Toxic Agent Produced By Helminthosporium Victoriae., Herbert Hodges Luke

LSU Historical Dissertations and Theses

No abstract provided.

Effects Of Lowered Oxygen Tension On The Susceptibility Of Daphnia Magna To Certain Inorganic Salts., Edward Joseph Fairchild

LSU Historical Dissertations and Theses

No abstract provided.

Inheritance Of Perimeter And Wall Thickness Of Fiber In A Cross Between Two Varieties Of Upland Cotton., Moahmed Ali Bishr

LSU Historical Dissertations and Theses

No abstract provided.

Albino Mutants In The Golden Hamster, Robert J. Kinney

Bachelors’ Theses

Coat color variations or other inherent changes in the golden hamster, Mesocricetus auratus Waterhouse, have been uncommon. With a few exceptions, these animals have been remarkably uniform since 1930, when they were reared in captivity for one first time.

The Flowering And The Production Of True Seed Of Sugarcane In Louisiana., Elias D. Paliatseas

LSU Historical Dissertations and Theses

No abstract provided.

The Induction Of Polyploidy In Sugarcane And Tomato By The Use Of Colchicine And The Study Of Its Influence On The Growth And Development Of The Root System Of Tomato., Yousef Al-Doory

LSU Historical Dissertations and Theses

No abstract provided.

A Cytological Study Of The Sweet Potato (Ipomola Batatas, L., Lam.) And Its Related Species., Chen-Ting Yu

LSU Historical Dissertations and Theses

No abstract provided.

An Analysis Of The Variation Of Food Contents In The Stomach Of The Common Perch (Perca Flavescens), Carl Lewis Heller

Dissertations and Theses @ UNI

This study was conducted primarily to determine the variation in the amount of food ingested by the common perch according to the time of day; secondarily, to determine any variation in the types of organisms ingested as food . In the teaching of the biological sciences, the teacher strives to enlighten and stimulate the students toward a better understanding of the living world. This study shows promise of furthering information about a common organism and should be of interest to the teacher and students.

Study Of The Aspectional Variations Of Siphonaptera Associated With The Nests Of The Thomas Wood Rat Neotoma Lepida Lepida Thomas, J. Franklin Howell

Theses and Dissertations

Much work has been done concerning those parasites found upon the host. Very little has been done concerning those parasites that are parasitic but are very rarely found upon the host. Therefore, the purpose of this study is to determine seasonal distribution of those fleas found in the nests of the desert wood rat (N. l. lepida). This paper shows that there is a seasonal variation of flea populations within a certain geographic area. It also shows that certain species of fleas are distributed seasonally; not all species being present in the same season. Three of the eleven species collected …

Distinguishing Characteristics Of The Seeds Of Garden Flowers Of Utah And A Key For Their Identification, Naia H. Burkey

Theses and Dissertations

The purpose of this thesis has been to make a collection of the seeds of herbaceous dicotyledonous garden flowers of Utah, to examine their external structural characteristics and to prepare keys for their classification. A collection of the seeds of 146 species of garden flowers has been made, and includes species of 41 families. The seeds have been cleaned and dried and a collection stored in labelled vials and left in the Botany Department of the Brigham Young University. Keys have been prepared for the identification of the families, genera, and species. As far as possible external characteristics--such as color, …

A Critical Study Of The Genus Pantosteus (Catostomidae), Keith M. Standing

Theses and Dissertations

The purpose of this paper is to critically study and analyze all species belonging to the genus Pantosteus and to determine tbe validity of the characteristics that were used to separate the genus Notolepidomyzon from the genus Pantoateus. Special reference was made to the morphology of the fontanelle and the weberian ossicles. In order to more thoroughly comprehend the reasons for Cope describing Pantosteus as a new genus and Fowler describing Notolepidomyzon as a new sub-genus and then Snyder elevating it to the status of a genus as complete a historical sketch as possible was made using all literature known …

The Succession Of Vegetation On A Southern Utah Sand Dune, Elias S. Castle

Theses and Dissertations

The sand dunes lying ten miles northwest of Kanab in Kane County, Utah, support a sparse plant cover with four species dominating the vegetation: Psoralea stenostachys, Sophora stenophylla, Oryzopsis hymenoides, and Wyethia scabra var. attenuata. Of these Psoralea and Wyethia are endemic to the dunes or to a limited area which includes the dunes. The pineer species gain a start in the valleys between dunes and occupy the area only until sand covers them or until sand is blown away from their roots. Stabilization of the soils is not permanently in the interdune valleys and the dunes continue to wander. …

The Possible Influence Of Moon Phase Planting On Yield, Growth, And Chemical Composition Of Certain Groups, Angrew Buck Bond

Tennessee State University Alumni Theses and Dissertations

No abstract provided.

Measurement Of Residual Lung Capacities And Ventilatory Efficiency By The Nitrogen Clearance Method, Elizabeth Roorbach

Biology ETDs

Essential to an understanding of the behavior of the lung is a knowledge of its total gas capacity and those fractions of it which are utilized in the process of normal breathing. Only when these volumes are known, it is possible to make an appraisal of the efficiency of the pulmonary ventilation in maintaining physiologically adequate levels of oxygen and carbon dioxide in the alveolar spaces with a minimum of ventilatory effort.

A Study Of An Unusually Heat Resistant Variant Of Bacilius Circulans, Roberta D. Demaret

Biology ETDs

The problem herein described was initiated while following the growth rate of a culture over a ten-hour period. A flask of polypeptone agar had been held in a 47-degree Celsius water bath to maintain it melted so that the plates could be poured periodically. The plates poured during the last two or three hours were found to be heavily contaminated with a Gram-positive, aerobic, sporeforming bacillus. Aseptic technique had been used in pouring the plates; however, external contamination was possible over the long pouring interval, so the test was repeated incubating a flask of the sterilized medium in the water …

The Influence Of Varying Hydrogen Ion And Alumina Concentrations On The Strength Characteristics Of Handsheets Made In The Presence Of Locust Bean Gum, Ronald L. Hamilton

Paper Engineering Senior Theses

Mannogalactans and particularly locust bean gum are used for a wide variety of applications. They serve as thickening agents and emulsifiers for foodstuffs, in sizing as well as finishing yarns and in creaming rubber latex. The papermaking industry is the largest user of mannogalactans. Here they are used in kraft grades, sulphite, book papers, coating raw stock, offset and printing grades, bonds, ledgers, and other fine papers and also in newsprint and other groundwood sheets.

Locust bean gum and methylcellulose are effective as deflocculating agents and are said to surpass the performance of deacetylated karaya gum. Both hydration film and …

The Influence Of Pith Cells On The Papermaking Characteristics Of Pulp From Bagasse, Miguel A. Cabrera

Paper Engineering Senior Theses

Literature Survey

Introduction

The fact that the need for paper products is increasing in an unparallel manner with the wood resources available at the United States market, has open the field for research studies in the development of new raw materials.

Bagasse has been a waste product submitted to intense laboratory investigation due to the fact that is a world available and relatively cheap fiber. Its use as a papermaking material has been investigated over a 100 years. Its development has been attacked by the different and contradictory opinions obtained from pilot plant runs and lack of knowledge techniques in …

Fiber Length As A Variable Influencing Wet Strength, Charles Elliott

Paper Engineering Senior Theses

It was desired to discover the influence of fiber length on wet strength obtained by the addition of a resin. The wet strength tests chosen were the tear and tensile, the retention of the resin was also measured. The resin used was melamine formaldehyde acid colliod.

The wet tensile showed no significant drop with decreasing fiber length until the fibers were cut very short. The wet tear was shown to be very sensitive to any change in fiber length. The retention of the resin was relatively unaffected by the fiber length.

The Performance Of Sodium Hypochlorite And Sodium Hypobromite As Bleaching Agents At Varying Levels Of Hydrogen Ion Concentration, Ted Jewson

Paper Engineering Senior Theses

Limited information was found in literature survey on the bleaching of wood pulp by means of hypobromites. Experimentation showed that the addition of sodium bromide to sodium hypochlorite results in accelerated bleaching. The optimum pH range for bleaching was found to be higher in presence of hypbromites than in straight hypochlorite bleaching. The maximum brightness values obtained in bleaching with either straight sodium hypobromite or with mixtures of hypochlorite and hypobromites were lower than those obtained with sodium hypochlorite.

Possible Use Of Chlorine Dioxide For Bleaching Deinked Paper Stock, Donald E. Thorton

Paper Engineering Senior Theses

The literature survey shows that chlorine dioxide can be used to bleach virgin pulp to a high brightness. The purpose of chlorine dioxide is to preserve the strength of the pulp.

The purpose of this thesis was to find out if chlorine dioxide could be used to preserve the strength of deinked paper stock.

Paper stock was found to lose strength when bleached with calcium hypochlorite and mixed with virgin pulp the loss of strength carried over in the mixture.

When the paper stock was bleached with chlorine dioxide, there was no loss of strength in the paper stock.

Supercalender Variables (Ii) The Effect Of Supercalender Pressure And Temperature On The Physical Properties Of Paper, Robert C. Walker

Paper Engineering Senior Theses

This thesis is the second in a series of fundamental investigations of the variables of supercalendering. The variables studied in this thesis are roll temperature and nip pressure. These variables were investigated by testing three types of paper that were supercalendered at various controlled roll pressures and temperatures. Different values of these variables during supercalendering were found to cause noticeable differences in the physical properties of supercalendered paper. It was observed, after studying the physical tests made on each of the three types of paper, that the type of paper being supercalendered, influences, to a varying degree, the effect of …

An Investigation Of A Mutation That Appeared In The University Poultry Flock, Its Genetic Behavior Its Role On Fertility, Hatchability And Livability Of Chicks, William Eddie Hubbard

Tennessee State University Alumni Theses and Dissertations

No abstract provided.

Effects Of Various Levels Of Krilium On Some Factors Of Soil Structure And Plant Development, General S. Stone

Tennessee State University Alumni Theses and Dissertations

No abstract provided.

The Nutritional Requirements Of A Strain Of Shigella Dysenteriae 1, Carl G. Mays

Biology ETDs

It was the purpose of this investigation to develop [a synthetic] medium for the growth of Shigella dysenteriae 1, strain 14-1, originally obtained from the collection at the Army Medical Service Graduate School. Not only was it desirable to grow the cells, but also to grow them in large quantities in the least possible time. Although considerable work has been done in determining the various growth essentials for many of the Shigella group, particularly the Flexner strains of Shigella paradysenteriae, comparatively little has be ascertained regarding those strains included in Shigella dysenteriae.

Protein Metabolism In Rats With Tumors Of The Liver, Chester R. Richmond

Biology ETDs

The purpose of our study was to determine possible alteration in water, fat, and protein content of the livers from rats fed DAB for long periods. Aliquots were used for the protein determinations.

Microscopic Alterations In Endocrine Glands And Other Organs Of Rats Fed The Hepatic Carcinogen P-Dimethylaminoazobenzene, Fenton C. Kelley

Biology ETDs

It was the purpose of this investigation to determine whether the feeding of DAB, in addition to inducing liver tumors, alters the microscopic structure of the endocrine system. In addition, a study was made of certain adrenal cortical hormones as possible modifiers of the carcinogenic effects of DAB.

Records And New Species Of Heterosphyronid Pseudoscorpions, Don L. Torgerson

Biology ETDs

Since the description of the family Chthoniidae by Hansen in 1894, the group has been revamped considerably. Most notable of these revisions are the works of Chamberlin (1931) and Beier (1932). At the present time the family contains twenty genera and several subgenera (unpublished data, C.C. Hoff). The distribution of the family Chthoniidae is cosmopolitan.

Age And Growth Of The Utah Chub, Gila Atraria (Girard), In Panguitch Lake And Navajo Lake, Utah, From Scales And Opercular Bones, John M. Neuhold

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Previous literature indicates the opercular bone as a useful tool for the determination of age and growth of fish. The reliability and validity of this method is tested for two populations of Utah chub. Age and growth are calculated for 222 Utah chub collected from Panguitch Lake and 212 Utah chub collected from Navajo Lake, southern Utah, in 1952-1953 from both scales and opercular bones. Scales are measured with the aid of a projector. Opercular bones are measured directly. The center of growth of the opercular bone is posterior to the posterior lip of the fulcrum. Correction for curvature is …

Use Of Corn Syrup Solids Of Different Dextrose Equivalents In The Manufacture Of Frozen Desserts, Wiggo F. Axelgard

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The ice cream industry continually faces the problem of improving its frozen desserts. At the present time corn syrup solids are being used to supplement milk serum solids to improve the body and texture of these products.

One of the problems is to increase the total solids content of frozen desserts without increasing sweetness or developing sandiness in the finished product. There is a limit to the amount of milk serum solids that can be used because of the danger of sandiness and the cost. The use of corn syrup solids helps to overcome these limiting factors.

The corn syrup …

The Adaptation Of The Neutron Scattering Technique Of Soil Moisture Determination To Field Application, Robert L. Uhler

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

At the present time there is a recognized need for a better means of measuring soil moisture in situ. Soil moisture measurements are required in fundamental studies of soil moisture flow and soil-plant-water relationships as well as in practical studies in irrigation practices. Various phases of engineering also utilize soil moisture data, for example, soil moisture determinations are made during the construction of earth dams, road cuts and fills, and under airfield runways. The desired method should be quick, reliable, and adaptable over the moisture range from oven dryness to saturation.

Research in nuclear physics has revealed the neutron …