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Articles 1441 - 1470 of 1471
Full-Text Articles in Medicine and Health Sciences
Nutrients And Phytoplankton In Hyrum Lake, Robert Bruce Murray
Nutrients And Phytoplankton In Hyrum Lake, Robert Bruce Murray
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The current investigation indicates that the routine appearance of a noxious blue-green algal bloom of Aphanizomenon flos-aquae, in Hyrum Lake, a reservoir in northern Utah is a result of excess phosphorus. Data indicate that the algal growth is initiated by phosphorus liberated from the phosphorus rich bottom sediments, and at a time when nitrogen is present in excess in the lake relative to phosphorus.
Results indicate that the Little Bear River is the major source of nitrogen and phosphorus contributing to the eutrophication of Hyrum Lake. Nitrogen and phosphorus fluctuations in the Little Bear River proved to be concurrent with …
Carbon And Nitrogen As Regulators Of Algal Growth In Treated Sewage, Edward G. Foree, Charles Reece Scroggin
Carbon And Nitrogen As Regulators Of Algal Growth In Treated Sewage, Edward G. Foree, Charles Reece Scroggin
KWRRI Research Reports
Continuous flow algal cultures were grown under three different growth conditions using secondary sewage treatment plant effluent as the growth medium. The only variable within each run was the hydraulic residence time. The concentrations of growth regulating nutrients were varied between the runs so comparisons of the algal mass, composition, nutrient uptake, and genera could be made. The importance of CO2 availability for algal growth was also studied. A kinetic theory which based algal growth on cellular nutrient concentration was verified. The second phase of the study was a batch culture study in which the same growth medium was …
Factors Regulating The Growth Of Algae In Continuous Culture In Diluted Secondary Sewage Treatment Plant Effluent And Subsequent Biodegradability, Edward G. Foree, Caroline P. Wade
Factors Regulating The Growth Of Algae In Continuous Culture In Diluted Secondary Sewage Treatment Plant Effluent And Subsequent Biodegradability, Edward G. Foree, Caroline P. Wade
KWRRI Research Reports
Heterogeneous algal cultures were grown in laboratory continuous culture in continuous flow, completely mixed chemostats in secondary sewage treatment plant effluent diluted to give an ammonia nitrogen concentration of 10 mg/1. Variables were lighting, pH, carbon dioxide availability, and hydraulic residence time.
Optimum growth occurred under pH 7.0, excess CO2, and continuous lighting conditions. The availability of artificially supplied excess CO2 greatly increased the mass (standing crop) at steady-state over that produced under otherwise identical conditions for all residence times studied. For the case of excess CO2 availability, the nitrogen concentration in the algal cells regulated …
Range And Optimum Growth Concentrations Of Phosphate And Nitrate For Chlamydomonas Reinhardtii, Thomas E. Hill
Range And Optimum Growth Concentrations Of Phosphate And Nitrate For Chlamydomonas Reinhardtii, Thomas E. Hill
Masters Theses
A study was conducted on the alga Chlamydomonas reinhardtii to determine the range and optimum growth concentrations of phosphate and nitrate. There are only a few species of algae for which this type of data is known. Inorganic nutritional data is basic to the understanding of the complexities of phytoplankton ecology and eutrophication.
The "plus" strain of this heterothallic alga was cultured in a TRIS-buffered inorganic medium with various concentrations of sodium phosphate and potassium nitrate and adjusted to a pH of 7.4. The axenic cultures were evaluated at the end of 6 days with a spectrophotometer, at a wavelength …
Metabolic Role Of Sulfates And Sulfides Producing Bacteria In Pollution Of Waters, M. I. H. Aleem
Metabolic Role Of Sulfates And Sulfides Producing Bacteria In Pollution Of Waters, M. I. H. Aleem
KWRRI Research Reports
Cytochrome transport particles from Nitrobacter catalyzed nitrite, ascorbate as well as NADH oxidation with concomitant phosphate esterification yielding P/0 ratios of 1.0, 0.6 and 2.0 respectively. Phosphorylation coupled to nitrite oxidation was not effected by rotenone, amytal or antimycin while 50 and 70% inhibition of the NADH-linked phosphorylation was observed in the presence of HOQNO and rotenone respectively. Cell-free extracts from Nitrobacter also catalyzed an energy-dependent reduction of NAD+ by nitrite. The reduction of cytochrome c by NŌ2 was energy-dependent which involved the reversal of electrons from cytochrome a1. The subsequent energy-linked reduction of the flavoproteins …
The Role Of D-Gluconic Acid In The Regulation Of The Synthesis Of The Enzymes Of The Entner-Doudoroff Pathway In Pseudomonas Fluorescens, Steven C. Quay
The Role Of D-Gluconic Acid In The Regulation Of The Synthesis Of The Enzymes Of The Entner-Doudoroff Pathway In Pseudomonas Fluorescens, Steven C. Quay
Honors Theses
Induction of Entner-Duodoroff pathway enzymes in Pseudomonas fluorescens was investigated to study the role of gluconate as a possible inducer. Glucose oxidase-deficient mutants were isolated and characterized. One of these mutants, gox-7, was deficient in particulate glucose oxidase; another mutant, gox-17, was deficient in particulate glucose and gluconate oxidase activities. Gluconate, but not glucose, induced synthesis of gluconokinase and 6-phosphogluconate dehydratase in both mutants. High constitute levels of 2-keto-3-deoxy-6-phosphogluconate aldolase were found when both mutants were grown on glucose. Growth of parent and both mutant strains on glycerol also resulted in high levels of Entner-Doudoroff pathway enzymes. It was concluded …
The Duration Of The Effect Of Different Carbohydrates On Neutrophilic Phagocytosis, Judy L. Reeser
The Duration Of The Effect Of Different Carbohydrates On Neutrophilic Phagocytosis, Judy L. Reeser
Loma Linda University Electronic Theses, Dissertations & Projects
In order to determine the duration of the effect of glucose, fructose, sucrose, honey, starch, and orange juice on neutrophilic phagocytosis, 10 subjects underwent a complete series of carbohydrate tolerance tests. Blood samples were drawn at specific time periods following ingestion of 100 grams of each carbohydrate. Blood was then analyzed for glucose and phagocytic index (the mean number of bacteria engulfed per leukocyte); a red blood cell and white blood cell count and differential white cell count were done also on about 1/2 of the samples. In addition, 7 other subjects participated in a fasting study in which no …
Algal Growth And Decomposition: Effects On Water Quality, Phase Ii, Edward G. Foree, Ronald L. Barrow
Algal Growth And Decomposition: Effects On Water Quality, Phase Ii, Edward G. Foree, Ronald L. Barrow
KWRRI Research Reports
The decomposition and associated nutrient regeneration of three unialgal cultures and one mixed culture containing an indigenous population of bacteria and microscopic animals were studied under dark, constant temperature laboratory conditions. After periods of nutrient-deficient growth ranging from O to 30 days, these cultures were inoculated with decomposer populations and subjected to anaerobic and aerobic environments for the decomposition studies. The extend of decomposition was determined from the percentage volatile suspended solids and percentage particulate COD remaining after 200 days of decomposition. The average extent of decomposition was greater for aerobic than for anaerobic conditions. However, significant portions of the …
Molecular Weight Determinations Of Some Salmonella Potsdam Bacteriophage Dna's, Winston H. Richards
Molecular Weight Determinations Of Some Salmonella Potsdam Bacteriophage Dna's, Winston H. Richards
Loma Linda University Electronic Theses, Dissertations & Projects
Two group A phages, P9c/2 and P4/2, were studied. Their density, sedimentation velocity, and biochemical properties were compared. Their densities were determined by density gradient centrifugation in 38.3% cesium chloride. Sedimentation velocity was used to determine their molecular weights. To accomplish this, the DNA of P9c/2 and P4/2 was labeled with tritium and T2 DNA, labeled with 32P, was used as a standard. The DNA of P9c/2 and P4/2 was separately mixed with T2 DNA and centrifuged in a 0-15% sucrose gradient. The molecular weights were calculated using the formula D2/D1= (M2 …
Algal Growth And Decomposition: Effects On Water Quality, Edward G. Foree, John S. Tapp Jr.
Algal Growth And Decomposition: Effects On Water Quality, Edward G. Foree, John S. Tapp Jr.
KWRRI Research Reports
The chemical composition of algae grown in batch culture depends mainly on environmental conditions, nutrient availability, presence of predators, cell age, and species. The effects of nutrient availability and cell age on the composition of three unialgal cultures (algae + bacteria) and one hetergeneous culture (algae + bacteria + microscopic animals) were evaluated. The cultures were grown in batch culture under both nutrient-abundant and nutrient deficient conditions and the changes in compositions were observed. Luxurious uptake where nutrients are incorporated into cellular protoplasm at levels greater than those necessary for growth, and super-luxurious uptake, where some nutrients are stored rather …
The Overwintering Of The Fireblight Bacteria Outside Of Living Tissue In Utah, Sherman V. Thomson
The Overwintering Of The Fireblight Bacteria Outside Of Living Tissue In Utah, Sherman V. Thomson
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The purpose of this investigation was to determine the sites of overwintering of Erwinia amylovora (Burrill) Winslow et al. outside of living tissue in Utah. Bacterial isolates were taken from the surfaces of blighted twigs and mummified fruits remaining on the tree; also from internal dead tissue of blighted twigs and mummies, and from soil beneath blighted trees. Each isolate was tested for agglutination with antiserum specific for Erwina amylovora, susceptibility to Erwinia amylovora bacteriophage, production of symptoms in pear seedlings and development of bacterial ooze on green pears.
Both virulent and avirulent isolates were taken from all sites tested. …
Mastitis : Prevention And Control. 3. Implementing The Mastitis Control Programme, F C. Wilkinson
Mastitis : Prevention And Control. 3. Implementing The Mastitis Control Programme, F C. Wilkinson
Journal of the Department of Agriculture, Western Australia, Series 4
FARMERS who have followed the first two articles in this series should by now have established the recommended milking routine and be familiar with it.
A Study Of Puccinia Graminis And Cronartium Ribicola, Duane W. Hughes
A Study Of Puccinia Graminis And Cronartium Ribicola, Duane W. Hughes
Graduate Student Research Papers
It was the purpose of this study (1) to review the literary history of rusts in the United States and in the Northwest in particular, ( 2) to learn where rusts generally are found geographically, (3) to gain further information regarding the etiology of wheat rust (Puccinia graminis tritici), of white pine blister rust (Cronartium ribicola) and to become enlightened on other rusts, (4) to learn ways of controlling the two rusts, black stem rust of wheat and white pine blister rust, and to gain an appreciation of the economic importance of rust prevention.
A Survey Of Typical And Atypical Mycobacteria Isolated From Human Specimens, Joseph Paul Truant
A Survey Of Typical And Atypical Mycobacteria Isolated From Human Specimens, Joseph Paul Truant
Henry Ford Hospital Medical Journal
No abstract provided.
Unusual Bacterial Isolates Obtained From A Variety Of Clinical Specimens, J. P. Truant
Unusual Bacterial Isolates Obtained From A Variety Of Clinical Specimens, J. P. Truant
Henry Ford Hospital Medical Journal
No abstract provided.
Development Of Pleurotus Ulmarius Fr. Grown In Pure Culture, Delbert Swartz, J. D. Collar
Development Of Pleurotus Ulmarius Fr. Grown In Pure Culture, Delbert Swartz, J. D. Collar
Journal of the Arkansas Academy of Science
No abstract provided.
Further Studies On An Antibiotic Substance Produced By Rhizopus Nigricans Ehrenberg, Kenneth D. Mace, Delbert Swartz
Further Studies On An Antibiotic Substance Produced By Rhizopus Nigricans Ehrenberg, Kenneth D. Mace, Delbert Swartz
Journal of the Arkansas Academy of Science
No abstract provided.
Absence Of Pasteurella Pestis In The Wildlife Of Arkansas, R. Reece Corey, Leo J. Paulissen, Delbert Swartz
Absence Of Pasteurella Pestis In The Wildlife Of Arkansas, R. Reece Corey, Leo J. Paulissen, Delbert Swartz
Journal of the Arkansas Academy of Science
No abstract provided.
List Of The Smut Fungi Of Arkansas, George E. Templeton
List Of The Smut Fungi Of Arkansas, George E. Templeton
Journal of the Arkansas Academy of Science
No abstract provided.
A Study Of The Bacteriological Effectiveness Of Oral Thermometer Procedures In Three Selected Hospitals, Esther Mae Rose
A Study Of The Bacteriological Effectiveness Of Oral Thermometer Procedures In Three Selected Hospitals, Esther Mae Rose
Loma Linda University Electronic Theses, Dissertations & Projects
Because pathogens such as streptococcus and staphylococcus have been transferred in many hospitals, the source of the infections is of concern to doctors, nurses, and other medical personnel. As shown by the review of literature, good techniques are necessary to stop the spread of disease.
It was the purpose of this study to investigate one facet of patient safety by: (1) the culture of thermometers ready for use in three selected hospitals; (2) to determine the effectiveness of the Group, Individual, and Central Supply methods of disinfection currently practiced in the three selected hospitals.
The method for the experiment of …
An Evaluation Of Two Preoperative Skin Preparation Procedures Used In The Operating Room Of A Selected Hospital, Maxine Darling
An Evaluation Of Two Preoperative Skin Preparation Procedures Used In The Operating Room Of A Selected Hospital, Maxine Darling
Loma Linda University Electronic Theses, Dissertations & Projects
The purpose of this study was to find out the immediate and residual antibacterial effects of the two preoperative skin preparation procedures most commonly used in the operating room of this selected hospital.
This study was conducted on one hundred selected surgical patients from the general medical and surgical units of this hospital. The preoperative skin preparation Procedure A (ether-alcohol-tincture of zephiran) was compared with the preoperative skin preparation Procedure B (3 per cent hexachlorophene solution). Data for the comparison were gathered by taking four cultures at specified times. The cultures were taken from the operative sites on the surgical …
The Staphylococci, Joseph Paul Truant
The Staphylococci, Joseph Paul Truant
Henry Ford Hospital Medical Journal
No abstract provided.
Reed Canarygrass Germination At Five Seed Maturity Stages And Sixteen Seed Treatments, Richard N. Peaden
Reed Canarygrass Germination At Five Seed Maturity Stages And Sixteen Seed Treatments, Richard N. Peaden
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Reed canarygrass (Phalaris arundinacea) has long been recognized as adapted to wetlands and those subject to periodic flooding. In Utah, Wilson (1955) estimate that 40 percent of the valley bottom land is flooded at least part of the year. Much of this land is very dry late in the summer. Forages such as Alsike clover tolerate flooding and some salt but do not perform well under drouth. Work by Bolton (1946) indicated that flooding for 49 day did not cause serious permanent damage to Reed canarygrass. The author has observed Reed canarygrass growing in a shallow reservoir which …
Antibiotic Substance Produced By Rhizopus Nigricans Ehrenberg, Billy Joe Williams
Antibiotic Substance Produced By Rhizopus Nigricans Ehrenberg, Billy Joe Williams
Journal of the Arkansas Academy of Science
No abstract provided.
Problem Of Common Fungus Infections, Calvin J. Dillaha
Problem Of Common Fungus Infections, Calvin J. Dillaha
Journal of the Arkansas Academy of Science
No abstract provided.
Comments On The Bacillariophycaea Of North Central Arkansas, Albert Robinson Jr.
Comments On The Bacillariophycaea Of North Central Arkansas, Albert Robinson Jr.
Journal of the Arkansas Academy of Science
No abstract provided.
A Cyto-Taxonomic Study Of The Genus Geranium Within The Wasatch Region, Richard J. Shaw
A Cyto-Taxonomic Study Of The Genus Geranium Within The Wasatch Region, Richard J. Shaw
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The western North American species of the genus Geranium have never been satisfactorily clarified. The perennial, indigenous species of this interesting group have been particularly confusing. One important reason for confusion in this group is the fact that the taxonomic problems of the perennial species have never been studied from the genetic point of view. A sound delimitation of specific and subspecific boundaries and phylogenetic relationships cannot be achieved without the application of cyto-genetic principles.
In respect to the cytological phase of this study, the author has placed emphasis on chromosome numbers in order to show evidences for and possible …
Factors Affecting The Translocation Of Herbicides In Mesquite (Prosopis Juliflora), Dale W. Young
Factors Affecting The Translocation Of Herbicides In Mesquite (Prosopis Juliflora), Dale W. Young
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The control of mesquite is a major range problem in the Southwest. Mesquite is a thorny, woody shrub or tree that has infested 75 million acres of valuable range and pasture land in this region. It competes with grasses and other valuable plants for sunlight, moisture, and plant food. Mesquite also acts as a serious barrier to the handling of cattle on the range.
The Isolation Of Some Nonsymbiotic Nitrogen Fixing Organisms Occurring In Some Utah Soils, Richard B. Johnson
The Isolation Of Some Nonsymbiotic Nitrogen Fixing Organisms Occurring In Some Utah Soils, Richard B. Johnson
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Plants require ten elements in appreciable quantity and several others in smaller amount for their continued and normal growth. Three of these necessary elements, nitrogen, phosphorus, and potassium are most important because they occur in the soil in quantities which are usually small in proportion to that needed by the plants. Of these three, nitrogen is in most cases the limiting factor because of the ease with which it may be leached from the soil and comparatively large amount assimilated by plants. These factors coupled with the inhibiting high cost of artificially replacing it in the form of commercial fertilizers, …
The Effect Of Different Methods Of Handling Chicken Manure On The Viability Of Weed Seed, Golden L. Stoker
The Effect Of Different Methods Of Handling Chicken Manure On The Viability Of Weed Seed, Golden L. Stoker
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
It is well known that weeds spread and are perpetuated by means of seed and vegetative reproduction. The seeds in turn are spread by various agencies such as wind, water, animals and man. These agencies are aided by especially adapted seed mechanisms for dissemination.