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Articles 9001 - 9030 of 10983
Full-Text Articles in Entire DC Network
Brief Notices, Byu Studies
Surrogacy: A Controversial Alternative, Chad Jolley, Stuart Farnsworth
Surrogacy: A Controversial Alternative, Chad Jolley, Stuart Farnsworth
Brigham Young University Prelaw Review
This paper deals with the problems of surrogacy and how public policy has affected its practice. Several cases are described along with their legal implications. In addition, the morality and practice of surrogacy is questioned.
The Structure And Dynamics Of The Cs2 Molecular Ion, Karl Sohlberg, Chan Yibai
The Structure And Dynamics Of The Cs2 Molecular Ion, Karl Sohlberg, Chan Yibai
Faculty Publications
Several common elementary methods of computing molecular properties, prerequisite to molecular dynamics studies, are tested for their validity for CS+2. Judged sufficiently accurate, these methods are then used to aid in investigating the collisionally activated dissociation of CS+2 upon impact with xenon. Rice–Ramsperger–Kassel–Marcus (RRKM) unimolecular decay rate calculations are presented and compared to experimental studies employing collisional activation. RRKM theory is shown to reproduce the experimental results for collision energies near threshold. When corrected for vibrational anharmonicity, the RRKM calculation shows agreement with the experimental results over a slightly wider range of energies. A discussion is given on the applicability …
Observations On Double-Crested Cormorants (Phalacrocorax Auritus) At Sportfishing Waters In Southwestern Utah, Michael J. Ottenbacher, Dale K. Hepworth, Louis N. Berg
Observations On Double-Crested Cormorants (Phalacrocorax Auritus) At Sportfishing Waters In Southwestern Utah, Michael J. Ottenbacher, Dale K. Hepworth, Louis N. Berg
Great Basin Naturalist
Counts of Double-crested Cormorants (Phalacrocorax auritus) were made at 13 reservoirs and lakes in southwestern Utah during 1989–91 to determine current abundance of that species. Food habits of cormorants were studied at three of the reservoirs in 1989. Data were also collected on trout abundance during standardized gill-netting to make comparisons between cormorant numbers and trout abundance. Cormorants were observed at all waters studied except one and were generally most numerous during the spring as they migrated through the area. Estimated cormorant abundance ranged from 0 to 34 bird-days per ha and was highest at the larger, lower-elevation …
Identification Of Purshia Subintegra (Rosaceae), Frank W. Reichenbacher
Identification Of Purshia Subintegra (Rosaceae), Frank W. Reichenbacher
Great Basin Naturalist
Populations of Purshia in central Arizona are intermediate in some characters between Purshia subintegra, an endangered species, and Purshia stansburiana, the common cliffrose. These intermediates may represent forms derived from a history of hybridization and introgression between putative parent species. Morphological data were obtained from 216 pressed speciments of P. subintegra, P. stansburiana, and introgressed forms. Over 50 separate discriminant function analyses (DFA) and principal components analyses (PCA) were run on numerous combinations of raw and log-transformed data. The best variable suite, providing the clearest discrimination between groups, used log-transformed data on 15 morphological characters, but …
Vegetation Zones And Soil Characteristics In Vernal Pools In The Channeled Scabland Of Eastern Washington, Elizabeth A. Crowe, Alan J. Busacca, John P. Reganold, Benjamin A. Zamora
Vegetation Zones And Soil Characteristics In Vernal Pools In The Channeled Scabland Of Eastern Washington, Elizabeth A. Crowe, Alan J. Busacca, John P. Reganold, Benjamin A. Zamora
Great Basin Naturalist
Vernal pools are seasonal pools occurring in Mediterranean-type climates within which grow concentric zones of vegetation. We studied two vernal pools that lie within an Artemisia tridentata/Festuca idahoensis shrub-steppe landscape in the Channeled Scabland of eastern Washington to determine the relationship between vegetation zonation and soil characteristics. Abundant plant species in the pools include Elymus cinereus, Poa scabrella, Lomatium grayi, Allium geyeri, Eleocharis palustris, Epilobium minutum, Myosurus aristatis, Deschampsia danthonioides, and Psilocarphus oregonus. We surveyed topography, measured plant species frequency and cover to describe the vegetation zones, and used Sorenson's index of percent to similarity to verify our designation …
Habitat Requirements For Erigeron Kachinensis, A Rare Endemic Of The Colorado Plateau, Loreen Allphin, Kimball T. Harper
Habitat Requirements For Erigeron Kachinensis, A Rare Endemic Of The Colorado Plateau, Loreen Allphin, Kimball T. Harper
Great Basin Naturalist
Erigeron kachinensis is a rare endemic of the Colorado Plateau in southeastern Utah. This perennial composite grows in small, isolated populations at seeps and alcoves arising along canyon walls in Cedar Mesa Sandstone substrates. Characteristics of six Erigeron kachinensis sites in Natural Bridges National Monument, San Juan County, Utah, were studied to determine habitat requirements for this species. Sites were analyzed with respect to geology, soil chemistry, physical properties, and vegetational characteristics. The alcoves studied were very saline, often with soil surfaces covered with a white crust of salt. Living cover was enhanced by perennially moist soils, diminished amounts of …
Variance And Replenishment Of Nectar In Wild And Greenhouse Populations Of Mimulus, Robert K. Vickery Jr., Steven D. Sutherland
Variance And Replenishment Of Nectar In Wild And Greenhouse Populations Of Mimulus, Robert K. Vickery Jr., Steven D. Sutherland
Great Basin Naturalist
We compared nectar production in wild populations and greenhouse-grown populations of the monkey flower species of section Erythranthe of the genus Mimulus. Nectar was sampled from over 1000 flowers. For each flower the volume of nectar was measured with a calibrated micropipette and the percentage of sugar with a hand refractometer. Percentage of sugar varied little from flower to flower in both field and greenhouse studies, but volume varied markedly from flower to flower in field studies and even more in greenhouse studies. This high variance in nectar volumes appears to be intrinsic. The amount of nectar in greenhouse …
Coordination Of Branch Orientation And Photosynthetic Physiology In The Joshua Tree (Yucca Brevifolia), Kaylie E. Rasmuson, Jay E. Anderson, Nancy Huntly
Coordination Of Branch Orientation And Photosynthetic Physiology In The Joshua Tree (Yucca Brevifolia), Kaylie E. Rasmuson, Jay E. Anderson, Nancy Huntly
Great Basin Naturalist
Despite the profusion of light in deserts, morphological adaptations to increase light interception are common among desert plants. We studied branch orientation and related physiological parameters in the Mojave Desert Joshua tree, Yucca brevifolia (Agavaceae). Azimuth and inclination were measured on all leaf rosettes of 44 Y. brevifolia trees. Interception of solar radiation was modeled for leaves in hypothetical rosettes facing due south and due north in December, March, and June. Carbon isotope discrimination, nitrogen content, and conductance of water vapor were measured in leaves from north- and south-facing rosettes. Rosette azimuths were nonrandom; rosettes predominantly faced southeast. North-facing rosettes …
New Mammal Record For Fremont Island With An Updated Checklist Of Mammals On Islands In The Great Salt Lake, Kenneth L. Cramer
New Mammal Record For Fremont Island With An Updated Checklist Of Mammals On Islands In The Great Salt Lake, Kenneth L. Cramer
Great Basin Naturalist
No abstract provided.
The Design Of The Liahona And The Purpose Of The Second Spindle, Robert L. Bunker
The Design Of The Liahona And The Purpose Of The Second Spindle, Robert L. Bunker
Journal of Book of Mormon Studies
The Liahona was given by the Lord as a communicationsdevice for Lehi to determine the appropriate direction of travel. This device contained two pointers, only one of which was necessary to provide directional information. But the Liahona was more than just a simple compass in function, for it additionally required faith for correct operation. Since a single pointer always "points" in some direction, the additional pointer was necessary to indicate whether or not the first pointer could be relied upon. This proposed purpose for the second pointer conforms to a well-established engineering principle used in modern fault-tolerant computer systems called …
Prevalence Of Ectoparasite Infestation In Neonate Yarrow's Spiny Lizards, Sceloporus Jarrovii (Phrynosomatidae), From Arizona, Stephen R. Goldberg, Charles R. Bursey
Prevalence Of Ectoparasite Infestation In Neonate Yarrow's Spiny Lizards, Sceloporus Jarrovii (Phrynosomatidae), From Arizona, Stephen R. Goldberg, Charles R. Bursey
Great Basin Naturalist
No abstract provided.
Field Study Of Plant Survival As Affected By Amendments To Bentonite Spoil, Daniel W. Uresk, Teruo Yamamoto
Field Study Of Plant Survival As Affected By Amendments To Bentonite Spoil, Daniel W. Uresk, Teruo Yamamoto
Great Basin Naturalist
Efforts to reclaim amended and raw bentonite spoils with six plant species (two forbs, three shrubs, and one tree) were evaluated over a 4-year period. Plant species included fourwing saltbush (Atriplex canescens [Pursh] Nutt.), big sagebrush (Artemisia tridentata tridentata Nutt.), Rocky Mountain Juniper (Juniperus scopulorum Sarg.), Russian olive (Elaeagnus angustifolia L.) common yarrow (Achillea millifolium L.) and scarlet globemallow (Sphaeralcea coccinea [Pursh] Rydb.). Spoil treatments included addition of gypsum, sawdust, perlite, straw, and vermiculite; the control treatment was amended. Fourwing saltbush had 52% survival across all spoil treatments, with greatest survival occurring on perlite-treated …
Redband Trout Response To Hypoxia In A Natural Environment, Mark Vinson, Steve Levesque
Redband Trout Response To Hypoxia In A Natural Environment, Mark Vinson, Steve Levesque
Great Basin Naturalist
Redband trout (Oncorhynchus mykiss gairdneri) were observed approximately every 2 weeks in an intermittent southwest Idaho stream between August and December 1991. Instantaneous daytime dissolved oxygen concentration and water temperature declined from 4.0 to <2 mg/L and 17 to 2 °C, respectively, during this period. Redband trout declined from a maximum captured of 48 on 28 August to 1 on 8 November in one series of polls. As conditions approached hypoxia, trout exhibited little movement and positioned themselves in water just deep enough to cover their dorsal fin. High densities of speckled dace (Rhinichthys osculus) were also present in each pool until drying. The response of these fish to such extreme habitat conditions is probably a primary factor accounting for their distribution within arid landscapes.
Resource Overlap Between Mountain Goats And Bighorn Sheep, John W. Laundré
Resource Overlap Between Mountain Goats And Bighorn Sheep, John W. Laundré
Great Basin Naturalist
Mountain goat (Oreamnos americanus) and bighorn sheep (Ovis canadensis) ranges overlap substantially in northwestern United States and southwestern Canada. Resource overlap in food and habitat parameters is assumed, but the degree of overlap has not been estimated. Data from published separate and comparative studies on food and habitat use were used to calculate indices of resource overlap for goats and sheep. Indices of overlap for general forage classes (grasses, forbs, browse) were >0.90 in summer and winter for data based on pooled data from separate studies and in summer for data for comparative studies. In winter …
Predation Of Artificial Sage Grouse Nests In Treated And Untreated Sagebrush, Mark E. Ritchie, Michael L. Wolfe, Rick Danvir
Predation Of Artificial Sage Grouse Nests In Treated And Untreated Sagebrush, Mark E. Ritchie, Michael L. Wolfe, Rick Danvir
Great Basin Naturalist
We measured predation on 120 artificial sage grouse (Centrarcus urophasianus) nests in montane sagebrush grassland in northern Utah. We examined nests in areas that had been chained and seeded 25 years previously (treated areas) and in areas that were untreated. Predation rates of artificial nests were higher in areas of untreated sagebrush, even though these areas had greater sagebrush cover, taller shrubs, and greater horizontal plant cover. These results differ from those previously hypothesized for treated sagebrush habitat and may reflect a greater abundance of other potential prey species, especially lagomorphs, in untreated areas that attracted greater densities …
Colony Isolation And Isozyme Variability Of The Western Seep Fritillary, Speyeria Nokomis Apacheana (Nymphalidae), In The Western Great Basin, Hugh B. Britten, Peter F. Brussard, Dennis D. Murphy, George T. Austin
Colony Isolation And Isozyme Variability Of The Western Seep Fritillary, Speyeria Nokomis Apacheana (Nymphalidae), In The Western Great Basin, Hugh B. Britten, Peter F. Brussard, Dennis D. Murphy, George T. Austin
Great Basin Naturalist
Thirteen Speyeria nokomis apacheana (Edwards) (Nymphalidae) populations from the western Great Basin were assayed for isozyme variability using starch-gel electrophoresis. Eight of the 25 presumptive isozyme loci analyzed were found to be polymorphic. Collections made in 1991 and 1992 allowed for between-year comparisons of heterozygosity and the estimation of effective population size for five of the sampled populations. Speyeria nokomis apacheana populations exhibit lower mean heterozygosity levels than other nymphalids. This may be attributed to genetic drift in apparently isolated populations with small effective sizes.
Influence Of Fine Sediment On Macroinvertebrate Colonization Of Surface And Hyporheic Stream Substrates, Carl Richards, Kermit L. Bacon
Influence Of Fine Sediment On Macroinvertebrate Colonization Of Surface And Hyporheic Stream Substrates, Carl Richards, Kermit L. Bacon
Great Basin Naturalist
Colonization of macroinvertebrates was assessed in a stream impacted by inputs of fine sediments. Colonization was examined at the stream surface and within the hyporheos with Whitlock-Vibert (W-V) boxes. Hyporheic areas accumulated much greater amounts of all size categories of sediment. No significant difference was observed in the amounts of organic matter accumulated at either depth. Only 150-μm sediment had significant effects on macroinvertebrate total numbers and number of taxa. Total numbers of invertebrates at 30 cm were only 20% of those at the surface. Canonical correspondence of analysis indicated that the strongest influence on macroinvertebrates colonizing W-V boxes at …
Some Physiological Variations Of Agropyron Smithii Rydb. (Western Wheatgrass) At Different Salinity Levels, Rengen Ueng, Ivo E. Lindauer, Warren R. Buss
Some Physiological Variations Of Agropyron Smithii Rydb. (Western Wheatgrass) At Different Salinity Levels, Rengen Ueng, Ivo E. Lindauer, Warren R. Buss
Great Basin Naturalist
The purpose of this study was to determine the physiological responses of Agropyron smithii Rydb. to various saline environments as evaluated in the laboratory. Agropyron smithii Rydb. (Rosana) seeds were germinated, transplanted into nutrient solutions with NaCl concentrations of 0, 50, 100, 150, and 200 mM, and grown for 80 days in a growth chamber. Results indicated that leaf water potential, relative water content of leaf tissue, and concentrations of Na, K, and Cl in plant tissue were significantly affected by increasing NaCl concentration. However, leaf chlorophyll concentration and concentrations of Ca and Mg in plant tissue were …
Timing, Distribution, And Abundance Of Kokanees Spawning In A Lake Tahoe Tributary, David A. Beauchamp, Phaedra E. Budy, Brant C. Allen, Jeffrey M. Godfrey
Timing, Distribution, And Abundance Of Kokanees Spawning In A Lake Tahoe Tributary, David A. Beauchamp, Phaedra E. Budy, Brant C. Allen, Jeffrey M. Godfrey
Great Basin Naturalist
We counted kokanee spawners and carcasses every 1–7 days from mid-September through mid-November in 1991 and 1992 in Taylor Creek, a tributary to Lake Tahoe, California–Nevada. Less than 1% of the spawning run entered Taylor Creek before flow from Fallen Leaf Lake was increased on 2 October 1991; in 1992 the peak occurred on 30 September or 1 October after flows increased on 29 September. In both years spawners concentrated in the middle three of five stream reaches below the impassable Fallen Leaf Lake dam. From tab-and-recovery experiments, the average longevity of male spawners in the stream was 3.5 days …
Population Structure And Ecological Effects Of The Crayfish Pacifastacus Leniusculus In Castle Lake, California, James J. Elser, Christopher Junge, Charles R. Goldman
Population Structure And Ecological Effects Of The Crayfish Pacifastacus Leniusculus In Castle Lake, California, James J. Elser, Christopher Junge, Charles R. Goldman
Great Basin Naturalist
The recent appearance of the "California crayfish," Pacifastacus leniusculus, in Castle Lake, California, and interest in its potential impacts on the lake ecosystem provided motivation for a study of the population structure and habitat use of this species and its effects on aquatic macrophytes. Mark-recapture studies indicated that the total number of adult (3+ yr or older) crayfish in the lake was ca 10,100 individuals, yielding an estimate of lakewide crayfish density in preferred crayfish habitats of 0.13 adults m−2. Using mean body mass of individuals, we estimated that ambient biomass density was 5.9 g m …
What Constitutes A World History? Prentice Hall, History Of Civilization: Prehistory To The Present., Laurence Grambow Wolf
What Constitutes A World History? Prentice Hall, History Of Civilization: Prehistory To The Present., Laurence Grambow Wolf
Comparative Civilizations Review
No abstract provided.
Civil Systems: A Review Of The World-System Theories Of Andre Gunder Frank And Of Christpher Chase-Dunn And Thomas D. Hall, Roger Williams Wescott
Civil Systems: A Review Of The World-System Theories Of Andre Gunder Frank And Of Christpher Chase-Dunn And Thomas D. Hall, Roger Williams Wescott
Comparative Civilizations Review
No abstract provided.