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Articles 10471 - 10500 of 10956
Full-Text Articles in Entire DC Network
Front Matter, Vol. 15 No. 1
Brigham Young University Science Bulletin, Biological Series
No abstract provided.
End Matter, Vol. 15 No. 1
Brigham Young University Science Bulletin, Biological Series
No abstract provided.
Front Matter, Vol. 15 No. 2
Brigham Young University Science Bulletin, Biological Series
No abstract provided.
Ticks Of Japan, Korea, And The Ryukyu Islands, Noboru Yamaguti, Vernon J. Tipton, Hugh L. Keegan, Seiichi Toshioka
Ticks Of Japan, Korea, And The Ryukyu Islands, Noboru Yamaguti, Vernon J. Tipton, Hugh L. Keegan, Seiichi Toshioka
Brigham Young University Science Bulletin, Biological Series
This publication is a revision of Ixodid Ticks of Japan, Korea, and the Ryukyu Islands by Keegan and Toshioka (1957). The tick fauna of these areas is represented by 36 species in the genera Argas, Ornithodoros, Amblyomma, Boophilus, Dermacentor, Haemaphysalis, Ixodes, and Rhipicephalus. Three species of the family Argasidae and 10 species of Ixodidae were not treated in the original edition. The additional information contained in this revision was derived from field collections and a thorough review of the literature. Keys are provided for the identification of genera and species. For each species we have given synonymy, a brief diagnosis, …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
Botanical And Physiographic Reconnaissance Of Northern Yukon, Stanley L. Welsh, J. Keith Rigby
Botanical And Physiographic Reconnaissance Of Northern Yukon, Stanley L. Welsh, J. Keith Rigby
Brigham Young University Science Bulletin, Biological Series
The area of study is located in the northern panhandle of the Yukon Territory, and includes the British and Barn Mountains, Old Crow Flats, and the coastal plain of the north slope. The physiography and geology of the region is described and the plant communities are enumerated. An annotated list of 279 species, 15 subspecies, 63 varieties, and 1 form of vascular plants collected during the summer of 1970 is included.
End Matter, Vol. 14 No. 2
Brigham Young University Science Bulletin, Biological Series
No abstract provided.
Front Matter, Vol. 14 No. 2
Brigham Young University Science Bulletin, Biological Series
No abstract provided.
Cannibalism In Captive Rattlesnakes, Robert E. Bullock
Cannibalism In Captive Rattlesnakes, Robert E. Bullock
Great Basin Naturalist
No abstract provided.
Significance Of The Late Pleistocene Fauna From The Little Box Elder Cave, Wyoming, To Studies Of Zoogeography Of Recent Mammals, Charles A. Long
Significance Of The Late Pleistocene Fauna From The Little Box Elder Cave, Wyoming, To Studies Of Zoogeography Of Recent Mammals, Charles A. Long
Great Basin Naturalist
A late Pleistocene mammalian fauna from Little Box Elder Cave, eastern Wyoming, provides paleontological evidence bearing on several contemporary and related studies in zoogeography of Recent intermontane mammals and on understanding of rapidly changing environments in the Rockies in late Pleistocene and post-Pleistocene time. Both paleontological and zoogeographical findings suggest that during glacial periods in the Pleistocene the life-zones were lowered and, therefore, many boreal mammals ranged away from the glaciated Rocky Mountain chain. Since then, some of these returned or retreated northward as the climate moderated, and many warmth-adapted mammals approached the Rockies. The fossil and Recent faunas analyzed …
Limnological Status Of Big Soda Lake, Nevada, October 1970, Ervon R. Koenig, John R. Baker, Larry J. Paulson, Richard W. Tew
Limnological Status Of Big Soda Lake, Nevada, October 1970, Ervon R. Koenig, John R. Baker, Larry J. Paulson, Richard W. Tew
Great Basin Naturalist
On 17 October 1970, the thermocline in the mixolimnion of Big Soda Lake, Nev., was located between 15 and 20 m below the surface. The chemocline was found to lie between 30 and 35 m depth. Significant dilution of the lake has occurred since 23 July 1933.
Body Composition And Organ Weights Of The Verdin (Auriparus Flaviceps), George T. Austin
Body Composition And Organ Weights Of The Verdin (Auriparus Flaviceps), George T. Austin
Great Basin Naturalist
No abstract provided.
The Myology Of Sceloporus C. Clarki Baird And Girard (Reptilia: Iguanidae), Diane Marie Secoy
The Myology Of Sceloporus C. Clarki Baird And Girard (Reptilia: Iguanidae), Diane Marie Secoy
Brigham Young University Science Bulletin, Biological Series
Examination of the complete musculature of Sceloporus clarki clarki Baird and Girard and seven other species of Sceloporus revealed variation among species of Sceloporus and between Sceloporus and other iguanid lizards. The muscles in which the greatest variation was found were the intermandibularis group, the constrictor colli, the episterno-cleido-mastoideus, the episternohyoideus, the coracoid head of the triceps, the costocoracoid and the flexor tibialis externus. This study indicates: (1) Sceloporus is more closely allied to Crotaphytus than to the ground-dwelling iguanines; (2) the possibility of the basal stock of Sceloporus being arboreal, and (3) Sceloporus is a genus in the process …
End Matter, Vol. 14 No. 1
Brigham Young University Science Bulletin, Biological Series
No abstract provided.
Front Matter, Vol. 14 No. 1
Brigham Young University Science Bulletin, Biological Series
No abstract provided.
A Calorimetric Study Of Metal Ion Cyclic Polyether Interaction :|Bi. Cation Binding Properties Of Macrocyclic Polyethers In Aqueous Solution As A Function Of Temperature ; Ii. Effect Of Solvent Dielectric Constant On The Binding Properties Of Cyclic Polyethers For Na[Superscript +] And K[Superscript +], Dennis Pershing Nelson
Theses and Dissertations
The complexation properties of the two isomers of the cyclic polyether dicyclohexyl-18-crown-6 are examined in aqueous solution for a series of metal ions at various reaction temperatures. The results are discussed in terms of size relationships and salvation characteristics of both polyether and metal ions. ΔCp° values are determined from the temperature dependence of the ΔH° values. A discussion of the errors involved in the determination of ΔH° from the temperature dependence of log K values is also included. Comparisons are made between the results of this study and those of a similar study by H. K. Frensdorff, E. I. …
The Altitudinal Distribution Of Mammals Of The La Sal Mountains, Utah, Stephen Robert Bradley
The Altitudinal Distribution Of Mammals Of The La Sal Mountains, Utah, Stephen Robert Bradley
Theses and Dissertations
This study deals with the distribution of the mammals of the La Sal Mountains, Grand and San Juan Counties, Utah. The distribution of the mammals has been correlated with the distribution of the vegetation zones of the mountains which varies with the elevation. The study points out which of the various mammals are found in the various vegetational communities and how the distribution varies from community to community.
The Hyobranchium And Throat Myology Of The Ambystomidae Of The United States, John E. Krogh
The Hyobranchium And Throat Myology Of The Ambystomidae Of The United States, John E. Krogh
Theses and Dissertations
The 16 species and subspecies of the Ambystomidae of the United States are placed into six groups according to their throat morphology as follows: The Dicamptodon group, the Rhyacotriton group, the A. annulatum-A. cingulatum group, the A. gracile-A. jeffersonianum-A. mabeei-A. macrodactylum-A. maculatum group, the A. talpoideum group, the A. opacum-A. texanum group, and the A. rosaceum-A. t. tigrinum-A. t. melanostictum-A. t. nebulosum group. Dicamptodon appears to be the most primitive group and Rhyacotriton the most specialized. Based on the morphology of the throat region it is suggested that A. rosaceum be placed in the tiger salamander group as a subspecies …