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A Flora Of Santa Catalina Island, California, Robert F. Thorne

Aliso: A Journal of Systematic and Floristic Botany

No abstract provided.

Studies On The Effects Of Toxic Materials On The Respiration Rate Of Tubificidae, Richard A. Sikora

Masters Theses

A study was made to determine the effect of lead, nickel and pentachlorophenol, at varying pH levels, on the respiration rate of this family of aquatic oligochaetes. Respiration was measured as the ul. of oxygen consumer per mg. of live tissue per hour of exposure.

Worms were found to decrease their rate of respiration in the presence of lead nitrate. This was demonstrated at three pH levels: 6.5, 7.5 and 8.5. It was concluded that this drop was due to the action of lead on the enzymes of the metabolic systems and on the characteristic of lead which stimulates the …

Louisiana Agriculture Magazine, Winter 1967-1968, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

The Influence Of Growth Media, Temperatures, And Light Intensities On Aspen Root And Top Growth, G.F. Gifford

Aspen Bibliography

Root and top growth of aspen cuttings in three soils (sand, loam, and clay) were studied in a controlled environmental chamber.

Influence Of Growth Media, Temperatures, And Light Intensities On Aspen Root And Top Growth, Gerald F. Gifford

Aspen Bibliography

No abstract provided.

A Metabolic Study Of The Isolated Perfused Snake Liver, James E. Turner

Master's Theses

A metabolic study was made on the isolated, perfused liver of Natrix fasciata fasciata (Linnaeus, 1776). Uric acid production, perfusate protein levels, serum protein patterns, perfusate glucose levels, and bile production were evaluated in this study as criteria of liver function.

The perfused liver was found to produce uric acid up through the fourth hour of perfusion. No significant differences (between the perfusions) were found in uric acid production/ gm of liver tissue.

Perfusate protein and glucose levels were found to be of a fluctuating or cyclic nature. There was found to be an inverse relationship between these two levels: …

Interference Of Ultraviolet Inactivated Parainfluenza 3 And Echo 21 Viruses With The Active Viruses In Tissue Culture, William Ernest Steinmetz

Master's Theses

Experiments were conducted to investigate the possibility of the production of interference by ultraviolet inactivated (UVI) Parainfluenza 3 (Para 3) and Echo 21 viruses with active Para 3 and Echo 21 viruses in tissue culture (TC).

Four major experiments were conducted: the effect of UVI Para ~ on active Para 3 in rhesus monkey kidney cell (MKC) tissue culture; the effect of UVI Para 3 on active Para 3 in HEp-2 TC; the effect of UVI Para 3 on Echo 21 in MKC TC; and the effect of UV! Echo 21 on Echo 21 in MKC TC. The rates of …

Germination Of Seeds Of Perennials Native To The Minnesota Region, May L. Wright

Journal of the Minnesota Academy of Science

Requirements for the germination of the seeds of herbaceous perennials native to the Minnesota region are given in general. Examples of specific requirements are noted for certain plant species.

On The Mechanism Of The Thiamine Catalyzed Reductive Dimerization Of Farnesyl Pyrophosphate To Squalene., Horatio D. Durst

LSU Historical Dissertations and Theses

The mechanism of the dimerization of farnesyl pyrophosphate to squalene was investigated in detail. Thiamine was found to catalyze this dimerization in yeast-soluble enzyme preparations. Removal of thiamine was found to cause the buildup of farnesyl pyrophosphate in the enzyme system. Derivatives of thiamine were tested to examine their effect on the dimerization reaction and were found to be inactive. It was found that extremely small amounts of thiamine enhance the formation of squalene while large concentrations inhibit the formation of squalene. Thiamine derivatives were synthesized to try to identify the intermediates in the enzyme system. These compounds are discussed …

A Bioassay For Detecting Compounds Which Stimulate Or Deter Feeding By The Sweetclover Weevil, W. R. Akeson, G. R. Manglitz, H. J. Gorz, Francis A. Haskins

Department of Agronomy and Horticulture: Faculty Publications

A bioassay employing sweetclover root disks impregnated with various plant extracts has been developed. The bioassay has been used to demonstrate the distribution of substances influencing feeding in fractionated water-methanol-chloroforrn extracts of Melilotus infesta Guss. and M. oficinalis L. Lam. leaves. Indications are that substances responsible for the resistance of M. infesta or the susceptibility of M. officinalis to feeding by adult sweetclover weevils, Sitona cylindricollis Fåhraeus, reside in the water-methanol fraction.

Phospholipids Of Thiobacillus Thiooxidans, J. M. Shively, A. A. Benson

School of Biological Sciences: Faculty Publications

Cells and spent growth media from sulfur- and thiosulfate-grown cultures of Thiobacillus thiooxidans were analyzed. The phosphatides were examined by thinlayer chromatography, and the products of their hydrolysis by hydrochloric acid and methanolic potassium hydroxide were separated by paper chromatography. The phospholipids in both cells and spent growth media were identified as phosphatidyl ethanolamine, phosphatidyl N-monomethylethanolamine, phosphatidyl glycerol, and diphosphatidyl glycerol. These comprised about 97% of the total lipid phosphorus. Lyso-phosphatidyl-N-monomethylethanolamine and lysophosphatidylglycerol accounted for the remaining 3%. The percentage of the total lipid phosphorus accounted for by each phospholipid depended on the age of the culture.

Adsorption Of Free Fatty Acids On Cells Of Certain Microorganisms, R. B. Maxcy, C. W. Dill

Department of Food Science and Technology: Faculty Publications

Information on the inhibitory effect of free fatty acids was sought by growing lactic streptococci in the presence of labeled fatty acids and collecting the cells on membrane filters. The distribution of the radioactivity indicated adsorption by the bacteria. As the number of cells in the growth medium increased, accumulation of radioactivity with the cells on the filter increased. The cells accumulated less than one-tenth as much radioactivity from sodium butyrate as from lauric acid. Washing the cells on the filter with water decreased radioactivity. More complete elution of the radioactivity was obtained by filtering the mixture after it was …

Studies Of The Capsule Wall Of Selected Musci From Coles County, William Milton Zales

Masters Theses

No abstract provided.

The Use Of Cationic Agents To Increase The Efficiency Of Titanium Dioxide In Paper, Richard Clapp

Paper Engineering Senior Theses

Handsheets were made with a bleached sulfite pulp, titanium dioxide and cationic agents. The optical properties of these sheets were studied in order to determine and compare the efficiency of the titanium dioxide retained. The cationic agents used in this study were a quaternary ammonium salt, a polyamide, cationic starches made with these two chemicals, and a commercial cationic starch.

When the optical properties of handsheets made from these substances were compared, it was found that the quaternary ammonium salt gave the highest opacity but the lowest retention. The polyamide gave lower opacities but higher retentions. The cationic starches made …

Ataxia Telangiectasia, Donald D. Worcester

Henry Ford Hospital Medical Journal

No abstract provided.

Louisiana Agriculture Magazine, Fall 1966, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

Review Of Protozoology, 5th Ed., By Richard R. Kudo (Thomas, Springfield, 1966), John J. Janovy Jr.

John J. Janovy, Jr. Publications

Review of Protozoology, 5th edition, by Richard R. Kudo, published by Thomas, Springfield, 1966.

Host And Prophage Modifications Of Ultraviolet Induction In Salmonella Potsdam, Bela B. Toth

Loma Linda University Electronic Theses, Dissertations & Projects

In induction experiments with naturally occurring and artificially lysogenic strains of S. potsdam, cells were irradiated in buffer, transferred to complete medium, and then assayed for free phage. Irradiation was followed by half hourly samples for free phage from the growing populations of irradiated cells. For an estimation of burst sizes, the irradiated cells were diluted out to a final concentration of 1 cell per ml and distributed to tubes in 0.5 ml quantities. All assays were done by the top-layer method with streptomycin incorporated in the top-layer and SP2-str^r as the bacterial indicator. The non-lysogenic strain S. …

Biochemical Properties Of Salmonella Potsdam Bacteriophage P4/2, Clyde L. Roggenkamp

Loma Linda University Electronic Theses, Dissertations & Projects

Over 90% recovery of phage P4/2 was realized with differential centrifugation concentration and purification, whereas only about 16% was recovered from the aqueous two-phase polymer - Genetron - ECTEOLA-cellulose column system. Purity of preparations was greatest with the density gradient centrifugation (A₂₆₀ = 2.66 and A₂₈₀ = 1.80 per 10¹² plaque-forming units). With the chemical system of concentration and purification followed by an ECTEOLA anion exchange run, the A₂₆₀ was 6.6 and the A₂₈₀ was 4.3.

Three tests were employed to determine the configuration of P4/2 DNA: (1) a formalin denaturation test, (2) a thermal …

The Fecal Shedding Of Listeria Monocytogenes By Conventional And "Germ Free" Mice, Margaret Joyce Ramsay

Loma Linda University Electronic Theses, Dissertations & Projects

A series of experiments involving Listeria monocytogenes was undertaken to study first the fecal shedding of Listeria by conventional mice challenged intraperitoneally with Listeria and second the fecal shedding and ability to survive of germ free mice with similar challenge. In addition, mites infesting Listeria infected mice were cultured for their possible contamination by Listeria.

Conventional mice were challenged intraperitoneally with a single near LD₅₀ dose of Listeria. Fecal Listeria were detected by collecting specimens from each mouse daily for the first 4 days and every second day thereafter. The feces was held at 7°C for 14 …

A Comparative Approach Into The Differentiation Of Two Strains Of Staphylococci, Walter D. Hoeksema

Masters Theses

Introduction

The purpose of this investigation was to differentiate Staphylococcus aureus phage type 42D from Staphylococcus epidermidis.

The investigation involved four approaches to this differentiation. The first was a selective screening technique on specific media to point out physical and biochemical characteristics and to demonstrate the presence of specific enzymes. The second was a drug survey which was used to show basic susceptibility and resistance to ten different antibiotics. The third was ultra-violet irradiation which was used to discern susceptibility and resistance to the soft rays of this spectrum segment. The fourth was a chromatographic procedure using labeled carbon which …

Isolation, Identification And Antibiotic Sensitivity Of Enteric Obligate Anaerobes In Cases Of Gastro-Enteritis, Gordon E. Newlin

Biology ETDs

Organisms capable of living in the absence of atmospheric oxygen were first described in 1861. However, it was not until almost forty years later that anaerobes were discovered to be associated with the human body. From 1900 until the present, most work with anaerobes concerned media and methods to promote the growth of these organisms. Their classification has been attempted, but their taxonomy still remains in a state of confusion. Rarely, and only in rather obvious cases, has the pathogenicity of these organisms been investigated. Consequently, these organisms and their relationship to pathogenicity remain relatively unknown to bacteriologists today.

Louisiana Agriculture Magazine, Summer 1966, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

An Organ Culture Technique For Maintaining The Pulp Tissue Of Intact Human Teeth, John P. Devincenzo

Loma Linda University Electronic Theses, Dissertations & Projects

The size of explants in organ culture is limited by their ability to feed, respire, and excrete by diffusion. The perfusion procedure described in this report is not limited to a particular explant size. The test tissue was the adult human tooth.

In order to maintain the pulp tissue of the intact human tooth in organ culture, special precautions were taken to prevent internal necrosis and to allow diffusion of nutrients and waste products. Using aseptic technique, a standard tissue culture medium plus appropriate antibiotics were delivered to a glass manifold housed in an incubator with an atmosphere at 100% …

A Cytological Study Of Germinating Aeciospores In The Cronartium Coleosporioides Complex, John A. Christenson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Peridermium harknessii Moore, causal agent of western gall rust, is responsible for deformation, cull and death of pine. In the West it is most serious on lodgepole and ponderosa pines. Seedlings and mature trees may be seriously attacked (Peterson, 1960). Gall rust is easily recognized by its branch galls and trunk cankers. Interest in the disease has fluctuated, but it is considered important enough that government monies support research on the disease in both the United States and Canada.

The Complex Formation Of Silver Ion With Ribonucleic Acid, Guanosine, Inosine And Related Compounds And Peroxidase-Like Activity Of A Haemundecapeptide Prepared From Horse Heart Cytochrome C, José Angel Reinosa

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The importance of nucleic acids in plant and animal cells as carriers of genetic information and as protein biosynthesis agents is well recognized. It is also known that nucleic acid is a component of all viruses.

Takahashi (45) and Fraenkel-Conrat (16) demonstrated that the protein component of tobacco mosaic virus is non-infectious to the host plant, although it is identical to the original virus morphologically. The virus ribonucleic acid (RNA) alone was infectious, however.

Deoxyribonucleic acid (DNA), which is present in chromosomes, displays a very specific function. The chromosome long has been accepted as the carrier of the hereditary unit, …

Preliminary Studies Of Germination Requirements Of Shadscale Atriplex Confertifolia Torr. And Ferm. Wats, Ijaz Hussain

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

Shadscale (Atriplex confertilolia (Torr. and Frem.) Wats.) is an important component of the salt-desert-shrub vegetation type in the intermountain region. This species dominates a large portion of the 41 million acres occupied by this vegetation type. Shapscale reaches greatest importance at lower elevations of Utah and Nevada, where despite the low productivity due to its harsh habitat, this vigorous shrub furnishes considerable winter grazing for sheep and cattle. Gates et al. (1966) have observed that poor drainage conditions, coupled with low precipitation, results in the concentration of salts, a chief habitat factor determining the growth and distribution of this species. …

A Cytological Study Of Certain Life Cycle Stage Of Eimeria Bovis, John V. Ernst

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Although much research has been done on the bovine coccidia little has been reported on the cytological nature of the different stages. Few descriptions of cytoplasmic structures occur in the literature. Because of the impermeability of the oocyst wall a definitive study of the nucleus in the unsporulated oocyst has not been made, nor have the nuclear changes during the two successive divisions which occur during the process of sporulation been described.

A Review Of Plant Propagation Methods, Somsong Aritajat

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this study was to consider how the rooting of cuttings may be affected by such methods and factors as: type of cutting, time of year when cuttings are best taken, differences between individual species, use of chemicals for the treatment of cuttings, rooting media, and the care of cuttings in the propagation beds.

In the past 35 years scientists have done considerable experimenting with the application of organic chemicals on the roots, stems and leaves of various plants. These organic chemicals have come to be known as "plant hormones" or "plant regulators." They have proved to be …

Potentiometric Measurement Of Sodium Chloride In Cheese, Seyed-Hossein Salimi

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The salt content of cheese is usually determined by the American Dairy Science Association (ADSA) (26) procedure. This method is based upon the determination of chloride in the sample, and results are expressed as per cent sodium chloride. The presence of chlorides in cheese other than sodium chloride would introduce error in the results. However, in practice this is not serious except where relatively large amounts of CaCl₂ are added to the cheese milk.

In determining the NaCl in cheese, one would be as justiied in basing his results on sodium analysis as on chloride analysis. An exception would …