Digital Commons Network^™

Ultrastructural Variation In Enamel Of Australian Marsupials, C. F. Gilkeson, K. S. Lester

Scanning Microscopy

This paper initiates a survey of the enamel of fossil and extant Australian marsupials by scanning electron microscopy. Enamel was examined from 17 extant and 11 extinct marsupials. Assessment was made of prism packing pattern, prism course, tubule presence, tubule size and distribution. Values calculated were: prism diameter; prism axis ratio; cross-sectional prism area; cross-sectional ameloblast area; and numerical prism density.

Three different prism packing arrangements were found for extant and fossil marsupials within the classical Pattern 2. The Pattern 1 arrangement found in three extant species was relatively unexpected given the general acceptance of Marsupialia as having Pattern 2 …

Dentin: A Dynamic Substrate - A Review, David H. Pashley

Scanning Microscopy

The structure of dentin is unusual in that the number and size of its tubules changes as one moves from the periphery toward the pulp chamber. Near the pulp, the tubules are very close together and the water con tent of this deep dentin is high. Near the enamel, the tubules are far apart, occupying less than 1% of the surface area. When enamel or dentin is cut, the surface becomes covered by an adherent layer of cutting debris called the smear layer. Its composition presumably reflects the composition of the underlying dentin. It is only about 1 μm thick …

One Daily Shows Virtually No Change In Coverage Of Minorities Since 1965, Ted Pease

Journalism and Communication Faculty Publications

No abstract provided.

Proceedings From The 26th Annual Marschall Italian Cheese Seminar, Various Authors

Cheese Industry Conference

No abstract provided.

Modeled F Region Response To Auroral Dynamics Based Upon Dynamics Explorer Auroral Observations, Jan Josef Sojka, Robert W. Schunk, J. D. Cravens, L. A. Frank, J. Sharber, J. D. Winningham

All Physics Faculty Publications

Auroral images from the Dynamics Explorer 1 (DE 1) scanning auroral imager have been combined with in situ auroral precipitation data from the DE 2 low altitude plasma instrument to form a time-dependent global auroral energy flux model. This model has both good time (12 min) and spatial (100 km) resolution compared to that currently available for global scale ionospheric and thermospheric modeling. The development and comparison of this model with others are discussed. Data from an aurorally active period, November 25, 1981, are presented and used as a case study for this model. Using a global ionospheric model, the …

Global Scale, Physical Models Of The F Region Ionosphere, Jan Josef Sojka

All Physics Faculty Publications

During the last decade, ionospheric F region modeling has reached an accurate climatological level. We now have global computer models of the F region which simulate the interactions between physical processes in the ionosphere. Because of their complexity, these climatological models are confined to modern day supercomputers. This review focuses on the development and verification of these physical ionospheric models. Such models are distinct from local models, steady state models, and empirical models of the ionosphere, which are, by their conception, unable to represent physically the range of F region variability or storm dynamics. This review examines the limitations of …

When Parents Grieve, Judith Rollins

All Archived Publications

No abstract provided.

Helping Children Understand And Cope With Death, Margaret Young

All Archived Publications

No abstract provided.

Cultural Resource Inventory And Testing In The Salt Creek Pocket And Devils Lane Areas, Needles District, Canyonlands National Park, Utah, United States Department Of The Interior National Park Service

All U.S. Government Documents (Utah Regional Depository)

This document is the final technical report on the first phase of a multiyear archeological program conducted in Canyonlands National Park. Some of the purposes of this project are to gather information for upgrading the park's interpretive program, increase the scientific understanding of Canyonlands' prehistory, and prepare a research design to guide future investigations. Archeological inventory of 4500 acres in the Needles District revealed a previously undocumented Archaic occupation and showed that Formative peoples using the area were primarily the Mesa Verde Anasazi, not the Fremont and Anasazi as previously thought. The data also indicate that prehistoric peoples used the …

Mule Deer Diets On A Chained And Seeded Central Utah Pinyon-Juniper Range, United States Department Of Agriculture, Forest Service

Forestry

Study of the seasonal use by mule deer of some native and introduced species on a pinyon-juniper restoration project showed that woody species made up the bulk of pellet samples, followed by forbs and grasses. Land managers are advised on seeding and grazing practices for enhancing big game habitats.

Thermospheric Dynamics During September 18-19, 1984, 2, Validation Of The Ncar Thermospheric General Circulation Model, G Crowley, B A. Emery, R G. Roble, H C. Carlson Jr., J E. Salah, Vincent B. Wickwar, K L. Miller, W L. Oliver, R G. Burnside, F A. Marcos

All Physics Faculty Publications

The validation of complex nonlinear numerical models such as the National Center for Atmospheric Research thermospheric general circulation model (NCAR TGCM) requires a detailed comparison of model predictions with data. The Equinox Transition Study (ETS) of September 17-24, 1984, provided a unique opportunity to address the verification of the NCAR TGCM, since unusually large quantities of high-quality thermospheric and ionospheric data were obtained during an intensive observation interval. In a companion paper (paper 1) by Crowley et al. (this issue) a simulation of the September 18-19 ETS interval was described. Using a novel approach to modeling, the TGCM inputs were …

Body Size, Population Metabolism, And Habitat Specialization Among Large African Herbivores, Johan T. Du Toit, N. Owen-Smith

Wildland Resources Faculty Publications

Large species generally occur at lower population densities than small species but, being larger, use more energy per individual. The balance between population density and energy use per individual determines how evenly community resources are shared by species of different size. Analyses of large data sets, covering a wide range of body sizes, have found that population metabolism (the product of population density and energy use per individual) scales either neutrally (Damuth 1981, 1987) or negatively (Peters 1983) with body mass. However, different scaling relationships may occur in certain communities within specific biogeographic regions. Brown and Maurer (1986) found that …

Proposed Rehabilitation And Betterment Program- Draft, United States Department Of The Interior

Elusive Documents

No abstract provided.

Utah Science Vol. 50 No. 4, Winter 1989

Utah Science

134 Will Utah Wither? The Uncertain Prognosis for Precipitation.

138 It Time to Weigh the Consequence of Climatic Change

141 Keeping Tab on the Weather

142 Xeriscaping: An Alternative to Thirsty Landscape

147 Understanding A Force That Power Weather System

148 Drought May Increase Danger from Some Poisonous Plant

153 No Hay Shortage ... Yet

154 Irrigate to Conserve Water

156 Check Tax Implication of Drought

157 Research in Brief

161 What to Do When Rangeland Dwindle: A Live tock Producer Guide to Alternative

167 Anhydrous Ammonia Treatment Improve Feed Quality of Straw

171 Irrigation for Highest Profit

173 Ingenious …

Fluorescence Microscopy Studies On (1,3) - B-D-Glucan In Barley Endosperm, A. W. Macgregor, G. M. Ballance, L. Dushnicky

Food Structure

Development of (1,3;1,4)-B-D-glucan and (1,3)-B-D-glucan in kernels of Himalaya and Bonanza barley has been followed by fluorescence microscopy using calcofluor and aniline blue fluorochromes. Specific enzymes were used to confirm the identity of these two polysaccharides in sections of endosperm tissue. All barley lines tested contained both types of B-glucan but (1,3;1,4)-B-glucan was synthesized at an earlier stage of development than was (1,3)-BGlucan. Small bead-like deposits of (1,3)-B-glucan were detected in all cultivars examined. These deposits were present throughout the endosperm and appeared to be associated with the inner walls of endosperm cells. After treatment of sections with (1,3)-B-glucanase, these …

Snow And Avalanche Physics: Physical Analysis Of Factors Affecting The Stability Of A Seasonal Continental Snowpack, James Frankenfield

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

Each section in this paper is intended to be as independent as possible. An attempt has been made to avoid references to other sections, and in particular to equations previously used. Hopefully the reader will not find it necessary to page back and forth very much. Figures and footnotes are numbered separately for each section.

A glossary has been included to assist the reader who is unfamiliar with some of the terms used. It includes entries of a qualitative nature (e.g. 'rime', 'graupel') as well as technical terms (e.g. 'Strouhal number').

The text was prepared using Wordperfect 4.1. Certain symbols …

Rheology And Microstructure Of Strained Yoghurt (Labneh) Made From Cow's Milk By Three Different Methods, A. Y. Tamime, M. Kalab, G. Davies

Food Structure

Labneh is the name for strained yoghurt, i.e., yoghurt made with an elevated solids content, which has originated in the Middle East. For this study , three types of Labneh were made from cow' s milk: (a) "Traditional Labneh" was produced by straining yoghurt in a cloth bag, (b) "UF Labneh" was made by ultrafiltration of warm yoghurt , and , (c) "UF Retentate Labneh" was obtained by culturing homogenised ultrafiltration (UF) milk retentate. A 11 products were passed through a lactic curd homogen is er to smoothen the Labneh curd . Total solids contents of t he products were …

Food Microstructure

Food Structure

No abstract provided.

Food Microstructure

Food Structure

No abstract provided.

Microstructure Of Nunas: Andean Popping Beans (Phaseolus Vulgaris L.), Stephen C. Spaeth, Daniel G. Debouck, Joseph Tohme, Janny Van Beem

Food Structure

Nunas, popping beans (Phaseous vulgaris L.), burst and expand when heated rapidly. Differences in seed microstructure between popping and conventional (non-popping) bean genotypes conceivably contribute to popping in nunas However, the microstructural characteristics which contribute to the popping attribute and sites of expansion have not been identified. Seeds and excised cotyledons of unpopped and popped nunas were examined using scanning electron microscopy (SEM). Protoplasts of unpopped nunas were similar to protoplasts of conventional beans. Intercellular spaces of unpopped nunas were occluded by schizogenous cell walls. The occluded form of intercellular spaces differed distinctively from the open form in popped nunas …

Judgments Of Restrictiveness, Social Acceptability, And Usage: Review Of Research On Procedures To Decrease Behavior, Robert L. Morgan

Special Education and Rehabilitation Counseling Faculty Publications

Research on professionals’, consumers’, and others’ judgments of the restrictiveness, social acceptability, and estimated frequency of use of procedures to decrease behavior were reviewed. General findings were that (a) respondents generally were consistent in rating procedures from least to most restrictive; (b) most respondents agreed that procedures judged more restrictive should be used as a last resort; (c) more restrictive procedures were not frequently used in practice; (d) respondents generally agreed that less restrictive procedures were more socially acceptable, and vice versa; and (e) the social acceptability of procedures changed as a function of contextual variables. Problems related to research …

Survival Of Trout Strains As Affected By Limnological Parameters, Wayne A. Wurtsbaugh

Watershed Sciences Faculty Publications

Prior work at East Canyon Reservoir, Utah indicated that adult trout are important predators of stocked juvenile rainbow trout. Brown trout, in particular, were exclusively piscivorous when th~y exceeded 185 mm standard length. Fish became increasingly important in the diet of cutthroat trout greater than 330 mm. The purpose of this study was to further document the effect of adult trout on survival of juvenile rainbow trout in mid-elevation reservoirs. Causey Reservoir was chosen because it was thought to contain large brown and cutthroat trout and had not been intensively studied during the last eight years.

The Radiomycetaceae (Mucorales; Zygomycetes). Calcium Oxalate Crystals On The Sporangiolar Wall And Aerial Hyphae, G. L. Benny, S. R. Khan

Scanning Microscopy

Calcium oxalate crystals occur on the sporangiolar appendages and aerial hyphae of the two known genera (Hesseltinella, Radiomyces) of the mucoralean family Radiomycetaceae. In Hesseltinella the sporangiolar appendages are acicular with a polygonal, square, or hexagonal, discoid base. The appendage core consists of calcium oxalate and is composed of two portions: (1) a round, acicular spine with a more or less hexagonal base, and (2) a square, polygonal, or hexagonal, discoid base with a central perforation that generally contains the spine base. Both portions of the spine core appear to be readily separable. In species of Radiomyces the …

Quantitative Margin Analysis In The Scanning Electron Microscope., J. F. Roulet, T. Reich, U. Blunck, M. Noack

Scanning Microscopy

Interface between restorative materials and tooth hard substances must be morphologically as perfect as possible to avoid plaque accumulation and subsequent secondary caries or pulpal diseases. Therefore the marginal behavior of restorations is an important parameter to predict their longevity.

Morphologically, the quality of margins is characterized by different well defined criteria. Using a replica technique it is possible to assess the complete marginal circumference of restorations in the SEM. Margins of restorations show a large variety of their morphology. This publication describes a method to quantify the quality of dental restorations.

The restoration margins are traced on the SEM …

Tubuloreticular Reorganization Of Cytomembranes In Cells Treated With With Human Alpha Interferons - A Review, P. M. Grimley, S. Ray, M. Kostianovsky, B. Rupp, Y. -H. Kang, D. Feldman

Scanning Microscopy

Human alpha interferons (IFN-a) cause a reorganization of internal cell membranes into tubuloreticular inclusions (TRI). Morphogenesis and cytochemistry indicate a pre-Golgi intracisternal origin from the endoplasmic reticulum. Clinically, TRI formation in human blood mononuclear cells correlates with systemic IFN-a treatment or with endogenous overproduction of IFN-a in viral or autoimmune diseases (e.g., rubella syndrome, AIDS, systemic lupus erythematosus). In vitro, TRI formation can be produced by treatment of Daudi lymphoblasts or vascular endothelial cells with IFN-a, and is blocked by actinomycin-D. In Daudi lymphoblasts or vascular endothelial cell cultures, TRI formation parallels induction of 2'-5' A synthetase, inhibition of …

Small Payload Accommodations (Spa) For The Atlas Family Of Launch Vehicles, Gerald Broad, David Lynn

Small Satellite Conference

The history of small, secondary payload accommodations on early ATLAS boosters is reviewed. Design and flight operations concepts for small payloads on current ATLAS launch vehicles are presented and discussed. ATLAS launch vehicle system capabilities are presented in terms of launch site integration schedules and the excess performance which will be available to launch small payloads.

Ariane Utilization For Secondary Payloads, G.G. Reibaldi, M. Trischberger, G. Melchior, J. Breton

Small Satellite Conference

In preparing for the future, the European Space Agency (ESA) has identified a growing shortage of flight opportunities for secondary payloads. This was most directly felt in the execution of the In-Orbit Technology Demonstration Programme (TOP), which is aimed at the demonstration of new technologies in orbit, before their application in projects, thereby reducing the overall risk. The TOP took a lead in investigating the possibility of using the European heavy lift launcher Ariane-IV as a low cost secondary payload carrier, not only for technological, but also for scientific and educational experiments. The secondary payloads were in the form of …

The Scout Launch Vehicle System, Pamela Tanck, James Williams

Small Satellite Conference

SCOUT, a four-stage, solid-rocket launch vehicle originally developed by LTV Missiles and Electronics Group, is completing its third decade of service. NASA-Langley started the program in 1958 with the intent of providing a simple, low-cost, reliable launch vehicle for orbital, probe and re-entry missions. On July 1, 1960, the first SCOUT vehicle was launched. Since SCOUT became operational in 1963, there have been 88 launches of which 84 were successful, representing a reliability record of 95.5 percent successful flights. In addition, over the past 20 years the reliability rate is an excellent 98.2 percent. The role of the SCOUT launch …

Design Of The U2 Experiment Ground Support Equipment, Paul Panneton

Small Satellite Conference

Small satellites and sensor payloads aboard larger spacecraft can benefit from ground support equipment (GSE) which reduces the time and cost of developing and flight qualifying space instruments. User friendly microcomputers and a comprehensive system design make such GSE possible and, due to the availability of high speed processors with real-time operating systems, even sophisticated instruments can be accommodated. This was demonstrated by The Johns Hopkins University / Applied Physics Laboratory (JHU / APL) during its work with the U2 Experiment, part of the Strategic Defense Initiative Office's Delta 181 Mission. The U2 Experiment, an orbiting multi-sensor optical emissions instrument, …

Cell-Based Gaas Mmics For Small Satellite Applications, S.P. Maccabe, D.G. Lockie

Small Satellite Conference

Highly integrated, reliable microwave components are needed for small satellite applications. The GaAs integrated circuit industry has been developed largely due to military electronic requirements. In particular, the library cell approach by Pacific Monolithics holds promise for making simple and complex microwave systems available at a cost not prohibitive for small satellite 'applications. This paper outlines the cell library approach, cells now in the library and some microwave systems built by integrating components from the cell library.