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Articles 2281 - 2310 of 3018
Full-Text Articles in Life Sciences
Spatial Patterns Of Plant Communities And Differential Weathering In Navajo National Monument, Arizona, Jack D. Brotherson, William E. Evenson, Samuel R. Rushforth, John Fairchild, Jeffrey R. Johansen
Spatial Patterns Of Plant Communities And Differential Weathering In Navajo National Monument, Arizona, Jack D. Brotherson, William E. Evenson, Samuel R. Rushforth, John Fairchild, Jeffrey R. Johansen
Great Basin Naturalist
Vegetation patterns in Navajo National Monument, Arizona, were studied over a five-year period from 1977 to 1981. Twelve distinct plant community types occur within the boundaries of the park. These communities are characterized and the dominant plant species of each are recorded. The relationships of parent material, soils, and moisture to plant communities are also discussed. It appears that discrete communities occupy soils of different characteristics, particularly with respect to amount of weathering of parent material.
Distribution Of The Shoshone Scuplin (Cottus Greenei: Cottidae) In The Hagerman Valley Of South Central Idaho, Richard L. Wallace, J. S. Griffith Jr., D. M. Daley, Patrick J. Connolly, G. B. Beckham
Distribution Of The Shoshone Scuplin (Cottus Greenei: Cottidae) In The Hagerman Valley Of South Central Idaho, Richard L. Wallace, J. S. Griffith Jr., D. M. Daley, Patrick J. Connolly, G. B. Beckham
Great Basin Naturalist
Cottus greenei, a potentially threatened species endemic to Idaho, was collected from 49 localities in 25 springs/streams in south central Idaho. Most localities were along the north bank of the Snake River in waters of the Thousand Springs formation, Gooding County. One population was found in a spring in the main Snake River. Another sculpin, Cottus bairdi, was collected with C. greenei at 23 locations in 16 springs/streams. Confusion concerning the type locality of Cottus greenei is discussed.>
Warm Water Aquaculture Using Waste Heat And Water From Zero Discharge Power Plants In The Great Basin, Richard A. Heckmann, Robert N. Winget, Rex C. Infanger, Roger W. Mickelsen, John M. Hendersen
Warm Water Aquaculture Using Waste Heat And Water From Zero Discharge Power Plants In The Great Basin, Richard A. Heckmann, Robert N. Winget, Rex C. Infanger, Roger W. Mickelsen, John M. Hendersen
Great Basin Naturalist
Two series of experiments were completed to determine (a) toxicity of waste water from power plants on warm water fish and (b) multiple use of waste heat and water for aquatic animal and plant production. All three types of waste water from a typical coal-fired power plant are acceptable for growing catfish and tilapia following aeration. This growth was compared with fish raised in spring water. Closed, recirculating polyculture systems using evaporation pond water operated efficiently for plant (duckweed) and animal (fish and freshwater prawns) production. Duckweed is an excellent supplement for fish feed. Tilapia and freshwater prawns grew rapidly …
Bird Distributional And Breeding Records For Southeastern Idaho, Utah, And Adjacent Regions, Clayton M. White, Herbert H. Frost, Dennis L. Shirley, G. Merrill Webb, Richard D. Porter
Bird Distributional And Breeding Records For Southeastern Idaho, Utah, And Adjacent Regions, Clayton M. White, Herbert H. Frost, Dennis L. Shirley, G. Merrill Webb, Richard D. Porter
Great Basin Naturalist
New distributional records or the status for 33 species of birds that have occurred within Utah, adjacent southeastern portions of Idaho, or along the border of states surrounding Utah are reviewed. Four species, the Cattle Egret (Bubulcus ibis), Common Moorhen (Gallinula chloropus), Great-tailed Grackle (Quiscalus mexicanus), and Common Grackle (Quiscalus quiscula), represent new Utah breeding records established within the past decade, and they are commented upon. One other, the Black-tailed Gnatcatcher (Polioptila melanura), may be breeding in Utah. The Mockingbird (Mimus polyglottos) may likewise be breeding in southeastern …
The High Uintas: Utah's Land Of Lake And Forest, C. Lynn Hayward
The High Uintas: Utah's Land Of Lake And Forest, C. Lynn Hayward
Books by Faculty of the Monte L. Bean Life Science Museum
This book details the exploration history, geology, hydrology, ecology, flora, and fauna of the High Uinta Range in Utah. Each chapter is written in a narrative style and includes photographs and identification for the various habitats and species discussed. In the Resources chapter, there is a collection of color photographs for greater aid in identification and appreciation of the beautiful Uinta region and the species that live there.
Table of Contents
Introduction
History
Rocks
Water
Forests
Meadows
Fishes
Birds
Mammals
Resources
Photo Credits
Life History Of The Lahontan Cutthroat Trout, Salmo Clarki Henshawi, In Pyramid Lake, Nevada, William F. Sigler, William T. Helm, Paul A. Kucera, Steven Vigg, Gar W. Workman
Life History Of The Lahontan Cutthroat Trout, Salmo Clarki Henshawi, In Pyramid Lake, Nevada, William F. Sigler, William T. Helm, Paul A. Kucera, Steven Vigg, Gar W. Workman
Great Basin Naturalist
The Pyramid Lake Lahontan cutthroat trout (Salmo clarki henshawi) population was sampled on a monthly basis from November 1975 through December 1977. A subsample of 676 trout, stratified by fish size and lake habitat, provided biological data. The entire population is presently derived from hatchery production, stocked at lengths of approximately 75 to 300 mm. Peak annulus formation occurs in March and April, followed by the period of maximum growth. Scale patterns illustrate a variable growing season. Maximum growth in length is in the first three years of life; after that males begin to grow faster than females. …
High-Temperature Battery Calorimeter, L. D. Hansen, R. H. Hart, D. M. Chen, H. F. Gibbard
High-Temperature Battery Calorimeter, L. D. Hansen, R. H. Hart, D. M. Chen, H. F. Gibbard
Faculty Publications
A battery calorimeter was built for the measurement of thermal energy generation of high-temperature lithium–aluminum/iron sulfide battery cells, which are under development for electric vehicle propulsion and other energy storage applications. The calorimeter was designed with a temperature range of 400˚–500˚C, a detection limit of 1 mW, and an upper limit of heat flow of 50 W. The results of measurements on 200-Ah LiAl/FeS cells were in excellent agreement with the predictions of thermodynamic calculations based on precise measurements of the total cell polarization and the temperature coefficient of the emf. Details of the construction and operation principles of this …
Sodium Flux Ratio In Voltage-Clamped Squid Giant Axons, David D. Busath, Ted Begenisich
Sodium Flux Ratio In Voltage-Clamped Squid Giant Axons, David D. Busath, Ted Begenisich
Faculty Publications
The sodium flux ratio across the axolemma of internally perfused, voltage-clamped giant axons of Loligo pealei has been measured at various membrane potentials. The flux ratio exponent obtained from these measurements was about unity and independent of membrane voltage over the 50 mV range from about -20 to +30 mV. These results, combined with previous measurements of ion permeation through sodium channels, show that the sodium channel behaves like a multi-ion pore with two ion binding sites that are rarely simultaneously occupied by sodium.
Transpiration And Co2 Fixation Of Selected Desert Shrubs As Related To Soil-Water Potential, S. B. Clark, J. Letey Jr., O. R. Lunt, A. Wallace, G. E. Kleinkopf, E. M. Romney
Transpiration And Co2 Fixation Of Selected Desert Shrubs As Related To Soil-Water Potential, S. B. Clark, J. Letey Jr., O. R. Lunt, A. Wallace, G. E. Kleinkopf, E. M. Romney
Great Basin Naturalist Memoirs
In desert plants, transpiration rates decreased before photosynthetic rates when plants were entering a period of water stress. This may have adaptive consequences. A difference of -5 bars in the soil-moisture potential had considerable importance in reducing the rate of transpiration. In Helianthus annuus L. (sunflower) the photosynthetic rate decreased before the transpiration rate in contrast to Great Basin-Mojave Desert plants, and the changes occurred with a -1 bar difference in soil-moisture potential. Morphological changes in three desert plant species [Artemisia tridentata Nutt., Ambrosia dumosa (Gray) Payne, Larrea tridentata (Ses. Moc. ex DC) Cov.] as the soil-moisture potential decreased …
Parent Material Which Produces Saline Outcrops As A Factor In Differential Distribution Of Perennial Plants In The Northern Mojave Desert, A. Wallace, E. M. Romney, R. A. Wood, A. A. El-Ghonemy, S. A. Bamberg
Parent Material Which Produces Saline Outcrops As A Factor In Differential Distribution Of Perennial Plants In The Northern Mojave Desert, A. Wallace, E. M. Romney, R. A. Wood, A. A. El-Ghonemy, S. A. Bamberg
Great Basin Naturalist Memoirs
An area of 0.46 km2 divided into six zones in the northern Mojave Desert transitional with the Great Basin Desert has been studied. Diversity is high among the perennial plant species within the 0.46 km2 area. Common species for the two deserts that are present in the area studied are Atriplex confertifolia (Torr. & Frem.) S.Wats., Ceratoides lanata (Pursh) J. T. Howell, Grayia spinosa (Hook.) Moq., Ephedra nevadensis S. Wats. Some other species present include Lycium andersonii A. Gray, Lycium pallidum Miers, Ambrosia dumosa (A. Gray) Payne., Larrea tridentata (Sesse & Moc. ex DC) Cov., Acamptopappus shockleyi A. …
Mineral Compostition Of Atriplex Hymenelytra Growing In The Northern Mojave Desert, A. Wallace, E. M. Romney, R. B. Hunter, J. E. Kinnear, G. V. Alexander
Mineral Compostition Of Atriplex Hymenelytra Growing In The Northern Mojave Desert, A. Wallace, E. M. Romney, R. B. Hunter, J. E. Kinnear, G. V. Alexander
Great Basin Naturalist Memoirs
Fifty samples of Atriplex hymenelytra (Torr.) S. Wats, were collected from several different locations in southern Nevada and California to test variability in mineral composition. Only Na, V, P. Ca, Mg, Mn, and Sr in the samples appeared to represent a uniform population resulting in normal curves for frequency distribution. Even so, about 40 percent of the variance for these elements was due to location. All elements differed enough with location so that no element really represented a uniform population. The coefficient of variation for most elements was over 40 percent and one was over 100 percent. The proportion of …
Heating-Effect Minimization In Dye Lasers, Kenneth Lee Matheson, James M. Thorne
Heating-Effect Minimization In Dye Lasers, Kenneth Lee Matheson, James M. Thorne
Faculty Publications
Optical pumping of dye lasers deposits heat nonuniformly in the active medium. Because the refractive index of a liquid or gas is a function of temperature, gradients are created which refract the laser beam. This effect is sometimes serious enough to quench laser action. In this paper, we evaluate the effects caused by optical pumping with a coaxial flashlamp and suggest ultraviolet absorbers and wavelength shifters as materials for minimizing the problem
An Emulsion Dye Laser, Kenneth Lee Matheson, James M. Thorne
An Emulsion Dye Laser, Kenneth Lee Matheson, James M. Thorne
Faculty Publications
A laser dye which is insoluble in water has been dissolved in hexane and emulsified in a water matrix. When pumped with a nitrogen laser, this mixture was observed to lase. The emulsion is superior to a simple hexane solution because the excellent thermo-optical properties of the water matrix help prevent refractive-index gradients from degrading laser performance. This is a useful characteristic for flash-pumped dye lasers, laser-pumped dye lasers, and liquid filters. Another type of solvent system, a critical solution, is also discussed. For certain dyes, a critical solution has even better thermo-optical properties because of its ability to absorb …
Mammals Of The Smithsonian Venezuelan Project, Charles O. Handley Jr.
Mammals Of The Smithsonian Venezuelan Project, Charles O. Handley Jr.
Brigham Young University Science Bulletin, Biological Series
Mammals and their ectoparasites were collected in all parts of Venezuela between 1965 and 1968 by the Smithsonian Venezuelan Project. Ecological and geographical data are summarized here for 38,213 specimens of 270 species of mammals obtained by the project.
Front Matter, Vol. 20 No. 5
Brigham Young University Science Bulletin, Biological Series
No abstract provided.