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Articles 28501 - 28530 of 29588
Full-Text Articles in Entire DC Network
Introductory Pages, Byu Studies
The “New Translation” Of The Bible, 1830-1833: Doctrinal Development During The Kirtland Era, Robert J. Matthews
The “New Translation” Of The Bible, 1830-1833: Doctrinal Development During The Kirtland Era, Robert J. Matthews
BYU Studies
No abstract provided.
Kirtland As A Center Of Missionary Activity, 1830-1838, Davis Bitton
Kirtland As A Center Of Missionary Activity, 1830-1838, Davis Bitton
BYU Studies
No abstract provided.
A Study Of Snail Hosts For Fasciola Hepatica In Utah Valley, Robert Michael Briem
A Study Of Snail Hosts For Fasciola Hepatica In Utah Valley, Robert Michael Briem
Theses and Dissertations
The Meat Inspection Division of the Bureau of Animal Industry in 195 0 reported that 322,647 livers or 2. 4% of 13,112,802 cattle slaughtered under United States Federal Inspection were condemned due to liver fluke infections (Price, 1953). This would amount to an annual loss of 3 million dollars in livers alone considering each liver weighed 10 pounds and retailed 65 cents per pound. This figure could conceiv-ably double or triple if additional losses due to animal death, decreased milk production, poor economic utilization of feed or lower livestock prices were considered.
Comparative Anatomy And Histology Of The Mantle Cavity Of The Chitons (Polyplacophora) Mopalia Muscosa And Mopalia Lignosa, Theodore P. Winfield
Comparative Anatomy And Histology Of The Mantle Cavity Of The Chitons (Polyplacophora) Mopalia Muscosa And Mopalia Lignosa, Theodore P. Winfield
Theses and Dissertations
The chiton Mopalia muscosa ranges from the open rocky coast to the bay environment, whereas the related chiton Mopalia lignosa is restricted to the outer rocky coast. The mantle cavity currents, anatomy and histology were investigated. Mucous gland cells of Mopalia muscosa are goblet type secretory cells. Their apparent ability to deliver their secretion rapidly together with having a short restitution period probably accounts for Mopalia muscosa having success at invading the bay environment. The mucous glands of Mopalia lignosa consist primarily of cells with medium to coarse secretory granules. These cells apparently are not as efficient at handling suspended …
Population Dynamics, Habitat Selection, And Partitioning Of Breeding Raptors In The Eastern Great Basin Of Utah, Dwight Glenn Smith
Population Dynamics, Habitat Selection, And Partitioning Of Breeding Raptors In The Eastern Great Basin Of Utah, Dwight Glenn Smith
Theses and Dissertations
A comparative study of the breeding ecology of 12 raptor species was conducted in the eastern Great Basin from 1967-1970. The project was designed to determine the composition and densities, habitat selection, territoriality and predatory habits of raptorial birds in a semi-arid environment. All topics were analyzed comparatively, relating the requirements and activities of the 12 raptor species. Average yearly population densities of all species approximated 0.5 pairs per square mile. Predominant raptors were the Ferruginous Hawk and Great Horned Owl. The productivity of these and the other large raptors correlated closely with the abundance of their main food source, …
Space Usage By The Small Mammal, Dipodomys Microps (Merriam), Barney William Cornaby
Space Usage By The Small Mammal, Dipodomys Microps (Merriam), Barney William Cornaby
Theses and Dissertations
The concept of home range is an important biological phenomenon and has received considerable attention. In applying the concept to mammals Burt (1943) defined it as, "that area traversed by the individual in its normal activities of food getting, mating, and caring for young. " Later, Hayne (1949) defined a circular home range with concentric zones of variable utilization around a center of activity. Both workers emphasized the need to know the behavior patterns of the animals within their respective home ranges. The statistical evaluation initiated by Hayne (1949) has been refined to provide increasingly precise probability estimates of an …
The Thermal Decomposition Of 2,2'-Azoisobutane, Mervin Dewain Atwood
The Thermal Decomposition Of 2,2'-Azoisobutane, Mervin Dewain Atwood
Theses and Dissertations
Nitrogen, isobutane, isobutylene and 2,2,3,3-tetramethylbutane are the only products found in the thermal decomposition of 2,2'-azoisobutane. They are the results of the direct free radical dimerization and disproportionation. Ratio of the rate constants of disproportionation to dimerization was found to be 1.9 at 268°C and 4.5% azobutane in helium. This compared with Blackham and Eatough's value of 1.4 at 243°C and 3.6 at 290°C with 4% azobutane in helium. The ratio of the disproportionation to dimerization increased with an increase in temperature. A change in contact time affected the ratio at lower reaction temperatures but had little effect on it …
An Investigation Of Some Free Radicals.|Ni.|Pdecomposition Of Nitrosyl Disulfonate Ion In Polar Non-Aqueous Solvents.|Nii.|Preaction Between 2,2-Diphenyl -1- Picryl Hydrazyl And Nitrosyl Disulfonate Ion Free Radicals, Janan Mary Hayes
Theses and Dissertations
Part I reports the stud y of the decomposition of nitrosyl disulfonate ion in DMSO, acetonitrile, and dichloromethane. A multi-step mechanism involving sulfite ion, sulfite ion radical, and nitrosyl monosulfonate radical as intermediates is proposed. The products of the decomposition are nitrosonium ion, hydroxylamine disulfonate ion, and hydroxylamine trisulfonate ion. A competitive chain reaction was observed when the decomposition occurred in DMSO. The chain reaction was insignificant in carefully dried acetonitrile and dichloromethane. Part II reports the study of the reaction between 2,2-diphenyl-1-picryl hydrazyl (DPPH) and nitrosyl disulfonate ion. Product analysis and kinetic data obtained from stopped-flow procedures suggest that …
Autoradiographic Studies Of The Distribution Of Serotonin In The Rat Brain, Brent D. Wagstaff
Autoradiographic Studies Of The Distribution Of Serotonin In The Rat Brain, Brent D. Wagstaff
Theses and Dissertations
Serotonin (5-hydroxytryptamine, 5-HT), considered to be a synaptic transmitter within the central nervous system, has been shown to be localized mainly in the paleocortex of the brain. Others have shown disturbances of normal 5-HT metabolism to be associated with mental illness and disease. Attempts to inject tritium labelled 5-HT into cerebrospinal fluid of the rat brain for anatomical localization studies were·made. The following observations were noted, (1) there exists a perivascular space in which fluid flows and distribution is relatively uninhibited as compared to subarachnoid space, (2) the labelled 5-HT penetration of brain tissue parenchyma is restricted and radioactivity is …
Predatory Activity Of Chrysopa Carnea Stephens In The Integrated Control Of Mite Pests In Utah Apple Orchards, Ray R. Bingham
Predatory Activity Of Chrysopa Carnea Stephens In The Integrated Control Of Mite Pests In Utah Apple Orchards, Ray R. Bingham
Theses and Dissertations
Mite pest problems in Utah apple orchards became generally serious about 1944, when DDT was first used extensively to control Codling moths, Carpocapsa pomonella (Linn.) (Jorgensen, 1967}. Since then several investigators (Pickett et al., 1946; Lord, 1949; Pickett, 1955; Lord, Herbert, and MacPhee, 1958) have examined the influence of various spray programs on apple orchard fauna, while still others (Clancy and Pollard, 1952; Morgan, Anderson, and Swales, 1958; Oat-man and Legner, 1962) have conducted related studies with widely used broad spectrum pesticides on apple mites and their predators. All seem to lend credence to the theory that mite pest problems …
Effect Of Exercise On Tissue Concentrations Of Thyroid Hormones And On Thyroxine Degradation Rate In The Rat, William W. Winder
Effect Of Exercise On Tissue Concentrations Of Thyroid Hormones And On Thyroxine Degradation Rate In The Rat, William W. Winder
Theses and Dissertations
Several methods were used to detect changes in thyroid activity and in degradation of thyroxine (T4) in exercising and sedentary control rats. Rats were run in a motor-driven exercise wheel over a three-week period at progressively increasing work loads and then were run 1.5-2 hours per day for 10-14 days before sacrifice. Disappearance of injected T4-125I from plasma was considerably enhanced by exercise. As determined by isotopic equilibration and paper chromatographic methods, T4 concentration was depressed in plasma and elevated in liver of exercised rats. No significant changes in T4 concentration were observed in heart, kidney, or gastrocnemius muscle. Thyroidal …
A Comparative Morphological Study Of Bryobia Rubrioculus (Scheuten) (Acarina: Tetranychidae), Robert Lee Frommer
A Comparative Morphological Study Of Bryobia Rubrioculus (Scheuten) (Acarina: Tetranychidae), Robert Lee Frommer
Theses and Dissertations
A comparative morphological study of Bryobia rubrioculus {Scheuten} from 24 worldwide sites was made to determine if enough significant variation existed to designate the mites from each locale as an isolated population. Forty-seven characters were then selected and measured for each mite and analyzed with Ward's error sum cluster analysis procedures. These analyses led to the conclusion that: {1} B. rubrioculus tends to form distinct populations within each respective locale, and mites from locales that did not form clusters are possibly a result of automictic parthenogenesis and introductions from other areas; {2} B. rubrioculus is distinctly separate from Bryobia praetiosa …
A Pectin Histochemical Study Of The Host Pathogen Relationship Between Pyrenochaeta Terrestris And Allium Cepa, Leroy Richard Cobia
A Pectin Histochemical Study Of The Host Pathogen Relationship Between Pyrenochaeta Terrestris And Allium Cepa, Leroy Richard Cobia
Theses and Dissertations
The involvement of pectin and pectinases in the host pathogen interaction of P. terrestris and Allium cepa were investigated by use of pectin histochemical stains at the electron microscope level. Several different pectin histochemical stains were used, but only two (the hydroxylamine reaction, and the pectin stain developed in this study) gave reliable results. It was observed that by the time the fungus has reached the host cell wall pectinesterase and endoplygalacturonase have fully removed the pectin from the host cell wall. When this has occurred, cellulases are released which continue to degrade the host cell wall. Electron transparent areas …
Studies Of Pig Brain Thiamin Pyrophosphokinase, James Weldon Peterson
Studies Of Pig Brain Thiamin Pyrophosphokinase, James Weldon Peterson
Theses and Dissertations
Pig brain thiamin pyrophosphokinase (TPK) (ATP: thiamin pyrophosphotransferase, EC 2.7.6.2) was purified 260-fold over extracts of brain acetone powder. The purification was followed using a direct, radiometric assay. As determined in an analytical ultracentrifuge and by disc-gel electrophoresis, the most highly purified enzyme preparations were not homogeneous. The purified enzyme has a broad pH optimum extending from 8.3 to 9.3 in phosphate-glycylglycine buffer. It has an isoelectric point at about pH 4.2. For optimal enzymatic activity, the ratio of magnesium to ATP must be 0.6. Any deviation from this ratio causes a rapid drop in enzymatic activity. A study of …
Prey Utilization By Nesting Golden Eagles In (Aquila Chrysaertos) In Central Utah, William Bruce Arnell
Prey Utilization By Nesting Golden Eagles In (Aquila Chrysaertos) In Central Utah, William Bruce Arnell
Theses and Dissertations
During the spring of 1969 and 1970, 28 Golden Eagle eyries in four locales in central Utah were observed to determine the prey utilized during the nesting season. Visits were made every two weeks to the eyries. Prey were removed from the nests upon counting to avoid recounting at the next visit. Sixteen species of vertebrates were found as prey for nesting Golden Eagles. Mammals comprised 96 per cent of the prey, and lagomorphs alone accounted for 92 per cent. The blacktail jackrabbit occurred as 77.8 per cent of all prey items. Avian species constituted 3.9 per cent of prey …
The Biochemical Response Of Provo Bay To Nutrient Inflow, R. Bruce Sundrud
The Biochemical Response Of Provo Bay To Nutrient Inflow, R. Bruce Sundrud
Theses and Dissertations
Provo Bay of Utah Lake, Utah, receives the effluents from farms, industry, and three cities. In order to determine the effects of these effluents, eleven stations were established throughout the Bay. At weekly intervals from June 19 to October 26, 1970, and monthly thereafter until March, 1971, the water at these stations was sampled for dissolved oxygen (DO}, carbon dioxide (CO2), turbidity, pH, phosphates, nitrates, biochemical oxygen demand (BOD) and coliform bacteria. Due to intense algal blooms, the quality of the water changes as it passes through Provo Bay. Average values for the inflow, mid-Bay, and point of discharge respectively …
A Study Of Seed Germination And Establishment Of Seedlings Of Lodgepole Pine In Different Soil Types Under Certain Bog Conditions, Yun-Fan Yuan
Theses and Dissertations
Soil texture, organic matter content, and hydrogen-ion concentration of soil samples were determined to find the correlation between soil characteristics, seed germination and seedling establishment of Pinus contorta. Scarification and stratification were treatments used for determining germination requirements of dormant seeds. Seeds were planted in different soils and experiments were conducted to determine the effects of different light intensities, temperatures, and depths of the water table on apparent photosynthesis rate and seedling establishment. Soil samples, pine cones, and young trees needed for the experiments were collected near Lily Lake, in the Uintah Mountains. The greatest and the fastest germination was …
Environmental Factors That Influence The Timing Of A Cyclic En Masse Foraging Migration Of Ligia Occidentalis Dana (Crustacea: Isopoda) On The Northern Gulf Of California, J. Wanless Southwick
Environmental Factors That Influence The Timing Of A Cyclic En Masse Foraging Migration Of Ligia Occidentalis Dana (Crustacea: Isopoda) On The Northern Gulf Of California, J. Wanless Southwick
Theses and Dissertations
En masse foraging migrations of Ligia occidentalis Dana were conspicuous events on rocky beaches near Puerto Peñasco, Sonora, Mexico. Experiments were conducted to determine which factors of the environment contained the regulating rhythm for the migration, if indeed the event were cyclic. Experiments were conducted in the laboratory using a tide-simulation aquarium and in the field using mark and release techniques. A time-lapse photography system was used in the field to quantify isopod activity for comparison with environmental factors. A regular cycle for the foraging migration was found. It was in tune with both insolation and tidal cycles so that …
Effects Of Ionizing Radiations On Mite Populations At The Nevada Test Site, Richard Riddle Walker
Effects Of Ionizing Radiations On Mite Populations At The Nevada Test Site, Richard Riddle Walker
Theses and Dissertations
Population and community studies dealing with radiation stress have essentially neglected the mites. When references have been made to the responses of mite populations to ionizing radiation, the form of radiation has almost always been gamma. This study reports results of naturally occurring populations of desert mites, at the Nevada Test Site, to ionizing radiation--largely beta. Eighteen species groups were identified from Berlese samples and tested for stress responses with species diversity indices and analyses of variations in predator-prey ratios. General agreement with previous studies showed a decreasing pattern in these two tests within the controls. This was interpreted as …
Post-Mortem Examination Of Cattle And Sheep For Parasitic Helminths, Phil Duke Wright
Post-Mortem Examination Of Cattle And Sheep For Parasitic Helminths, Phil Duke Wright
Theses and Dissertations
A survey of helminth parasites of sheep and cattle was conducted to determine the incidence and distribution of these parasites that could be detected by post-mortem examination. Animals were obtained from local abattoirs within the valley, and the viscera were examined for the presence of helminth parasites. Parasites identifies from sheep in order of highest incidence were: Haemonchus contorus, Ostertagia cicumcinta, Chabertia ovina, Nematodirus spathiger, Trichostongylus colubriformis, Thysanosoma actinioides, Trichuris ovis, N. filicollis, Echinococcus granulosus, Strongyloides papillosus, O. ostertagi, Cooperia oncophora, Cysticercus tenuicollis, Fasciola hepatica, Oesophagostomum venulosum, Moniezia expansa, and M. benedieni. Those recovered from cattle in order of highest …
Ultrastructural And Histochemical Investigations Of Ipomoea Batatus Lam. Infected By Rhizopus Stolonifer (Fr.) Lind, Kendall O. Smith
Ultrastructural And Histochemical Investigations Of Ipomoea Batatus Lam. Infected By Rhizopus Stolonifer (Fr.) Lind, Kendall O. Smith
Theses and Dissertations
The ultrastructural aspects of Rhizopus stolonifer (Fr.) Lind. Infection in Ipomoea batatus Lam. Roots and the histochemistry of cell walls affected by enzymes secreted by the fungus were investigated. Specimens were prepared for viewing in the electron microscope by thin-sectioning techniques. Degradation of cellular membreanes and host tissues in advance of the fungus was evident. Breakdown of the middle lamella was detected by special histochemical stains for pectin. Breakdown occurred in the following was: (1) maceration of the middle lamella before maceration of the cell wall, (2) simultaneous degradation of both the middle lamella and the cell wall, (3) maceration …
Academic Responsibility, Robert K. Thomas
Introductory Pages, Byu Studies
Two Iowa Postmasters View Nauvoo: Anti-Mormon Letters To The Governor Of Missouri, Warren A. Jennings
Two Iowa Postmasters View Nauvoo: Anti-Mormon Letters To The Governor Of Missouri, Warren A. Jennings
BYU Studies
No abstract provided.
Emerson's Relevance Today, Ray S. Williams
High-Pressure Equation Of State For Nacl, Kcl, And Cscl, Daniel L. Decker
High-Pressure Equation Of State For Nacl, Kcl, And Cscl, Daniel L. Decker
Faculty Publications
A calculation of the equation of state for NaCl from a Mie-Grüneisen equation was repeated using more accurate values of the zero-pressure compressibility. It was also extended to KCl and CsCl. An analysis of this approach to pressure calibration indicates that it will yield pressures with about the same accuracy as can be presently achieved by experimental measurements above 25 kbar, and thus furnishes a temporary practical pressure scale.
An Analysis Of Cattle Grazing On Steep Slopes, William Wayne Patton
An Analysis Of Cattle Grazing On Steep Slopes, William Wayne Patton
Theses and Dissertations
A field study was made to correlate cattle grazing patterns of steep terrain with the rest-rotation grazing system. Line-plot transects were positioned across each of three heavily grazed, steep canyons. The rest-rotation system as practiced on the Gooding Cattle Allotment is resulting in good forage use as the animals are grazing forage on slopes up to 60%. Level contour trails extending across slope faces made it possible for cattle to graze on steep slopes at distances up to 80 chains from water. Contour trails originate at watering loctions; hence better distribution of water could be expected to result in better …