Digital Commons Network^™

The Effect Of Various Environmental Factors On The Growth Of A Red Pigmented Dunaliella Species From The Great Salt Lake, Sam Oeun May

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A red, obligately halophilic Dunaliella species believed to be D. salina was isolated from the North Arm of the Great Salt Lake, Utah, and its optimum growth conditions were determined.

The red pigmented Dunaliella species required an optimum NaCl concentration of 10%, temperature 28°C, and an illuminance of 7500 lux. Ammonium carbonate was preferred over potassium nitrate and ammonium chloride. Potassium nitrate was preferred over ammonium chloride. The average division (generation) time under the above conditions was 46.5 hours.

The alga grown in ammonium carbonate showed a lower content of chlorophyll a compared to those grown in potassium nitrate and …

Comparison Of Microbial Activity In Desert Soils Of The Western United States, Patricia Ann Trujillo Y Fulgham

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Soils from four regional deserts, Great Basin, Sonoran, Chihuahuan, and Mojave, were collected at times throughout the year which would best exhibit microbial response to moisture or vegetation. The soils were analyzed for several chemical and physical properties. Biological and biochemical characteristics, namely respiration, dehydrogenase activity, adenosine triphosphate concentration, proteolytic activity, nitrification potential, and microbial numbers, were measured.

The soils exhibited fluctuations in microbial activity as measured by respiration, dehydrogenase activity, adenosine triphosphate concentration, proteolytic activity, and nitrification potential during different moisture seasons.

Increase in soil moisture as modified by precipitation did not cause a significant difference in respiration or …

Non-Parental-Type Recombinants In Crosses Between Different Restriction-Modification Systems In Salmonella, Mary Ball

Loma Linda University Electronic Theses, Dissertations & Projects

Many new restriction-modification (R-M) system which are closely linked to serB and allelic to the hsd_SB system of S. typimurium occur in different Salmonella serotypes. In PI transduction studies with these systems, recombinants were isolated which fell into one of three classes with reference to their specific restriction phenotype. Recombinants that restricted like the donor, recombinants that restricted like the recipient and recombinants that had lost the ability to restrict. This latter group having lost the recipient SB restriction without gaining the specific donor restriction and here called "zero recombinants,” were of special interest and were investigated.

Zero recombinants …

The Effects Of Polymer Molecular Weight On Colloidal Retention And The Bridging Mechanism, Joseph A. Bergeron

Paper Engineering Senior Theses

A review of retention is presented. Included are discussions concerning retention mechanisms, variables which affect retention, variables affected by retention and various retention aids. A detailed experimental procedures involving the use of the dynamic retention/drainage jar is included along with several modifications of the apparatus.

The purpose of the experimental work was to study the effects of polymer molecular weight on retention and the bridging mechanism. Two cationic retention aids of low and high molecular weight along with two non-ionic "bridging agent" retention aids were employed. Various combinations of these chemicals were studied at different levels of addition and under …

Oil-Soaked Birds Saved: Hsus Participates In Historic Bird Rescue

Close Up Reports

As the world watched the black tide of crude oil from the Amoco Cadiz devastate bird life along the French coast, HSUS staffer Guy Hodge was reporting to Congress about efforts to save oil-soaked birds in a recent Chesapeake Bay oil spill. A barge (ATC- 133) carrying nearly 500,000 gallons of crude had run aground south of the Maryland-Virginia border. Some of its cargo spilled into this North American waterfowl wintering area.

Together with HSUS cruelty investigator Phil Steward, Hodge had assisted in the most successful on-site bird rescue operation in history. One out of every three rescued birds was …

Oil-Soaked Birds Saved

Close Up Reports

HSUS participates in historic bird rescue

Louisiana Agriculture Magazine, Spring 1978, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

Studies On Uveitis Part Ii: Hypotheses With Case Reports, Philip C. Hessburg

Henry Ford Hospital Medical Journal

A number of patients with and without uveitis are used to show that this study of aqueous microbiology suggests the following hypotheses: 1. Routine techniques currently used in most microbiology laboratories overlook classical and variant bacteria which might be isolated from clinical specimens with improved microbiological techniques. 2. Bacterial forms may be present in other ocular tissue when not present in the aqueous. 3. Polymicrobial infections probably occur rather frequently, especially in chronic or subacute inflammatory states. 4. Alterations in various host factors may subject some persons to a greater incidence of inflammatory episodes including uveitis. 5. Antibiotics used in …

The Quantitative Determination Of 3-Oxo-Bile Acids, W. T. Beher, G. J. Lin, J. Sanfield, S. Stradnieks

Henry Ford Hospital Medical Journal

A new method for the rapid quantification of 3-oxo-bile acids has been developed. From 5 to 120 μg of oxo-acid in aqueous or ethanolic media are reduced with sodium borohydride. The resulting 3α- and 3β-hydroxy acids are then oxidized in a reaction catalyzed by 3-hydroxysteroid dehydrogenase, during which nicotinamide adenine dinucleotide (NAD) is reduced to NADH. The absorbance of the reaction mixture is determined at 340 nm and is directly proportional to the amount of 3-oxo-acid in the original sample. The method is fully compatible with that used in determining 3α-hydroxy-bile acids.

Museum Victory For Animal Rights, Henry Spira

Commentaries and Editorials

No abstract provided.

Permanent Light Microscopy Slides Of Eimeria Nieschulzi Oocysts, Alan A. Marchiondo, Donald W. Duszynski

Harold W. Manter Laboratory of Parasitology: Faculty Publications

The methods described here allow for the preparation of light microscopy slides of coccidian oocysts and thus, provide a durable sample and record for research and teaching. These methods used only one species, Eimeria nieschulzi; however, it is likely that use of other coccidian oocysts would produce similar results.

Alternatives For Ecosystem Classification And Their Use In Developing Rangeland Inventory And Management Planning Approaches, Neil E. West

Memorandum

No abstract provided.

Proceedings From The 15th Annual Marschall Invitational Italian Cheese Seminar 1977, Various Authors

Cheese Industry Conference

No abstract provided.

An Ecological Study Of A Natural Population Of Tribolium Brevicornis Le Conte (Coleoptera, Tenebrionidae), Gary D. Mulder

Theses Digitization Project

No abstract provided.

Annual Report: 1978

Cherry County (Nebraska) Extension: Historical Documents

Forward ......................... 1-2

Extension Organization and Planning ......................... 3-6

Reports of Accomplishments ......................... 7-15

Budget and Expenditures ......................... 16

Inventories ......................... 17-25

Partial Purification Of Heat Stable Enterotoxin Produced By Escherichia Coli Isolated From A Case Of Porcine Colibacillosis, Lee Ann Zochert Swanson

Electronic Theses and Dissertations

Colibacillosis (CB) in livestock is an economically important disease caused by the bacterium Escherichia coli. It is estimated that nearly one third of all baby pigs born in South Dakota die prior to weaning, and one fourth of these deaths is believed to be caused by CB (62). Similarly, it has been stated that 6 to 20% of calves born alive die from this disease (3). The term colibacillosis encompasses a group of diseases caused by E. coli in neonatal and weaned animals and humans (3). The several different types of CB are due to the differences in tissue localization …

Rescue Of Infectious Bk Virus From A T-Antigen Negative Bkv Transformed Bhk-21 Cell Line, David Michael Olive

Dissertations

No abstract provided.

In Vivo And In Vitro Interactions Between Bacteroides Fragilis And Escherichia Coli: Their Role In Intra-Abdominal Abscess Formation, James Carl Hagen

Dissertations

No abstract provided.

Gamsiella, A New Subgenus Of Mortierella (Mucorales: Mortierellaceae), R. K. Benjamin

Aliso: A Journal of Systematic and Floristic Botany

Mortierella multidivaricata is described and placed in a new subgenus, Gamsiella, of M ortierella. It is distinguished from species of subgenus M ortierella in having repeatedly divaricately branched sporangiophores. Large numbers of sporangiola develop simultaneously on slender, attenuate pedicels arising from the ultimate branches of the sporangiophore. The sporangiole of M. multidivaricata forms two subglobose, finely sculpttued sporangiospores. Mostly terminal, globose, spiny chlamydospores are formed in slender, secondary, intra- or extrahyphal hyphae that arise from living segments of the ageing aerial mycelium. Classification of the Mortierellaceae is summarized briefly. The type and only known strain of M. multidivaricata originated from …

Longevity Of White Bass In Beaver Reservoir, Arkansas, Thomas O. Duncan, Milton R. Myers Jr.

Journal of the Arkansas Academy of Science

No abstract provided.

Listeria Monocytogenes In The Environment Of Livestock In South Dakota, James W. Neiles

Electronic Theses and Dissertations

The purpose of this investigation is to study the incidence of Listeria monocytogenes in the environment of livestock in South Dakota. The data accumulated from these studies will provide information as to its natural habitat, mode of transmission and factors responsible for its incidence.

Methodology Development For The Study Of The Anaerobic Bacterial Flora Of Bovine Feces, Donald G. Kirsch

Electronic Theses and Dissertations

The intestinal bacterial flora of an animal has a considerable influence on the physiology of that animal. Some bacteria of the intestine are pathogenic and can initiate infections if they gain access to a susceptible individual. Some of the intestinal bacteria can produce potent carcinogens in vitro and can presumably do this also in vivo. Food passing through the alimentary tract of an animal is also chemically modified through the enzymatic action of the bacterial flora. The animal is also protected from some enteric infections through the antagonistic and competitive actions of the established organisms of the normal bacterial flora. …

Partial Characterization And Comparison Of Rhizobia From Astragalus Flexuosus Glycyrrhiza Lepidota, And Trifolium Spp., Elmer L. Eide

Electronic Theses and Dissertations

Biological nitrogen fixation, a means of alleviating our increasing dependence on synthesized nitrogen fertilizers, is being studied with renewed interest. Production of nitrogen fertilizer requires large amounts of natural gas and other non-renewable energy sources, while the energy for biological nitrogen fixation is derived either directly or indirectly from photosynthesis. With only limited supplies of natural gas and an increasing population, and thus increasing demand for food, the advantages and even necessity of understanding and enhancing biological nitrogen is obvious. The nitrogenase enzyme complex which catalyzes the reduction of dinitrogen to ammonia is possessed by a limited number of species …

An Electron Microscopic Investigation Of Bovine Abortion, Hans A. Draayer

Electronic Theses and Dissertations

Bovine abortion continues to cause economic loss to farmers and ranchers. In South Dakota, monetary loss from bovine abortion has been estimated at 4 to 4.8 million dollars annually. (31) Brucellosis was once considered the major cause of bovine abortion. Since the prevalence of brucellosis has been reduced to less than 1% of the total United States cattle population, there has been an increase in demand for laboratory assistance in the diagnosis of the causes of bovine abortion. With the present day technology in microbiology, histology, and serology, a confirmed identification of the causative agent of bovine abortion can be …

Cell Surface Changes During Early Mouse Development, James Thomas Rector

Electronic Theses and Dissertations

Objectives of this thesis were to further characterize cell surface properties of preimplantation mouse embryos. A study was conducted to determine latent effects of varying pulses of CB on early postimplantation mouse embryos by comparing their abilities to hatch, to attach and to sustain growth and differentiation of ICM and trophoblast tissue. CB treatment was begun at the 8-cell stage. Objectives of the studies involving Con A were to determine (1 ) whether agglutinability with Con A changes during compaction of 8-cell embryos, (2) if changes in numbers of binding sites parallel changes in agglutinability during preimplantation development, (3) whether …

Pregnancy Diagnosis In The Ewe, Michael J. Trapp

Electronic Theses and Dissertations

The ability to diagnose pregnancy accurately, rapidly and economically before the last six weeks of gestation in the ewe could be of real value as a sheep management tool. An efficient non-surgical pregnancy test could enable the producer to reduce feed costs, increase percent lamb crop and select for fertility. It is important to the health of the ewe and to the survival of the lamb that highly productive animals should be adequately fed. About 75% of the fetus' growth occurs during the last trimester of pregnancy. Therefore undernutrition of the ewe during this part of pregnancy leads to the …

Effect Of Limestone On Spring Weed Populations In A Fertilized Coastal Bermudagrass Sod, H. C. Fulcher, Lyell F. Thompson

Journal of the Arkansas Academy of Science

No abstract provided.

Studies On The Role Of Solar Ultraviolet Radiation In "Natural" Water Purification By Aquatic Ecosystems, John Calkins, Jeanne A. Barcelo, Perry Grigsby, Stephen Martin

KWRRI Research Reports

The possibility that pollution might deplete the stratospheric ozone layer and intensify solar UV at the earth's surface focuses attention on the role of solar UV in the various ecosystems at the earth's surface. Previous studies suggested that solar UV might contribute to bacterial die off in wastewater and the studies reported here were directed toward elucidating the action of solar UV in "natural" waters.

It has been assumed that solar UV action on aquatic ecosystems can be evaluated (using proper models) on the basis of the following four independently measurable quantities: I) the intensity of solar UV at the …

Aerated Steam: A System For Heat Treating Sugarcane To Control Ratoon Stunting Disease, Billy J. Cochran

LSU Agricultural Experiment Station Reports

No abstract provided.

Interactions In Lambdoid Bacteriophage Populations, Bruce Edward Mitchell

Masters Theses

The lambdoid bacteriophages are ideal subjects for the study of populational interactions at the molecular level because they do not mutually exclude one another in mixed infection of the same host cell. Previous work done in this laboratory using the lambdoid phage pairs λ-434 hy mi and λ-∅80 have demonstrated a density-dependent reduction in progeny yield per infected cell (burst size) as a function of increasing multiplicity of infection (m.o.i.). The λ cI gene which codes for the repress or molecule has been demonstrated to be the cause of the interaction in the λ-434 hy mi phage pair. …