Life Sciences Commons^™

Maize Radiation Use Efficiency Under Optimal Growth Conditions, John L. Lindquist, Timothy J. Arkebauer, Daniel T. Walters, Kenneth G. Cassman, Achim Dobermann

Department of Agronomy and Horticulture: Faculty Publications

Accurate measurement of crop growth and radiation use efficiency (RUE) under optimal growth conditions is required to predict plant dry matter accumulation and grain yield near the genetic growth potential. Research was conducted to quantify the biomass and leaf area index (LAI) accumulation, extinction coefficient, and RUE of maize (Zea mays L.) under conditions of optimal growth. Maize was grown in two environments over five growing seasons (1998–2002). Total aboveground biomass at maturity ranged from 2257 g m^-2 in 1998 to 2916 g m^-2 in 2001; values that are considerably greater than the biomass achieved in most …

Farmer Research: Conventional Experiences And Guidelines For Alternative Agriculture And Multi-Functional Agro-Ecosystems, Charles S. Wortmann, A. P. Christensen, Keith L. Glewen, Terence A. Hejny, J. Mulliken, J. M. Peterson, D. L. Varner, S. Wortmann, Gary L. Zoubek

Department of Agronomy and Horticulture: Faculty Publications

Crop producers are challenged to operate profitably, use resources efficiently, meet high standards of quality and protect the environment, while sustaining rural economies and societies. Cropping systems are generally fine-tuned and improved through changes that have small effects which can often be verified only through research. The processes and successes of two farmer research projects were studied. Results of these studies, information from other sources and the authors’ reflections on their own experiences were integrated to develop guidelines for the implementation of farmer research projects for alternative agriculture and multi-functional agro-ecosystems with diverse stakeholders. Surveys were mailed to 118 farmers …

Registration Of ‘Antelope’ Hard White Winter Wheat, Robert A. Graybosch, C.J. Peterson, P. Stephen Baenziger, Lenis Alton Nelson, B.B. Beecher, D. D. Baltensperger, J.M. Krall

Department of Agronomy and Horticulture: Faculty Publications

‘Antelope’ (Reg. no. CV-968, PI 633910) is a hard white winter wheat (Triticum aestivum L.) cultivar developed cooperatively by USDA-ARS, the Nebraska Agricultural Experiment Station, and the Wyoming Agricultural Experiment Station. Antelope has shown exceptional productivity under irrigated trials in western Nebraska, eastern Wyoming, and eastern Colorado. It combines high grain yield under irrigation with excellent lodging resistance.

Antelope was derived from the cross ‘Pronghorn’/‘Arlin’. Pronghorn (PI 593047, Baenziger et al., 1997) is a strong gluten hard red winter wheat developed by the University of Nebraska. Arlin (PI 564246, Sears et al., 1997) is a hard white winter wheat …

Effect Of Control Plot Density, Control Plot Arrangement, And Assumption Of Random Or Fixed Effects On Nonreplicated Experiments For Germplasm Screening Using Spatial Models, Boi Sebolai, Jeffrey F. Pedersen, D. B. Marx, D. L. Boykin

Department of Agronomy and Horticulture: Faculty Publications

Early generation selection experiments typically involve several hundred to thousands of lines. Various systematic and statistical techniques have been developed to increase effectiveness and efficiencies in such experiments, including the development and application of spatial statistical models. In this study, mixed model equations were used to provide least squares means (LSMEANs) and best linear unbiased predictors (BLUPs) and compare selection effectiveness and efficiencies to observed (Y) and true values in simulated experiments varying in size (10 X 10, 20 X 20 and 30 X 30 grids), control plots densities (0, 5, 10, 20, and 50%), control plot arrangements (high, medium, …

Agrostology; An Introduction To The Systematics Of Grasses, James P. Smith Jr

Botanical Studies

No abstract provided.

Quality Control During Aminoacyl-Trna Synthesis, M. Praetorius-Ibba, S. Ataide, C. Hausmann, J. Levengood, J. Ling, S. Wang, H. Roy, Michael Ibba

Biology, Chemistry, and Environmental Sciences Faculty Articles and Research

The fidelity of translation is determined at two major points: the accuracy of aminoacyl-tRNA selection by the ribosomes and synthesis of cognate amino acid/tRNA pairs by aminoacyl-tRNA synthetases (aaRSs) in the course of the aminoacylation reaction. The most important point in aminoacylation is the accurate recognition of cognate substrates coupled with discrimination of non-cognates. While this is generally accomplished by a single enzyme, we have recently found that discrimination against lysine analogues requires the existence of two unrelated lysyl-tRNA synthetases. For other amino acids, initial recognition is not sufficiently accurate with errors being corrected by an intrinsic editing activity. Recent …

Genetic Variation In Ustilago Bullata: Molecular Genetic Markers And Virulence On Bromus Tectorum Host Lines, Mikel Stevens, Daniel J. Fairbanks, Susan E. Meyer, David L. Nelson, Suzette Clement, Jennifer Waters

Faculty Publications

The pathogen Ustilago bullata often causes epidemic levels of head smut disease in Intermountain populations of the inbreeding annual grass Bromus tectorum. We examined patterns of genetic variation for virulence and for amplified fragment length polymorphism (AFLP) markers in four U. bullata populations on B. tectorum in northern Utah and southern Nevada. Patterns of disease incidence generally supported a genefor-gene model for virulence and resistance in this pathosystem. Most host lines were susceptible to most or all paired isolates included in cross-inoculation tests, but we found evidence for the existence of four avirulence genes. Host lines with alleles conferring resistance …

Seasonal Acceptance Of Fourwing Saltbush By Sheep When Crested Wheatgrass Is The Alternative, Val J. Anderson, R. D. Horrocks, Christine W. Royer, Stephen B. Monsen

Faculty Publications

Many sagebrush-grass ranges have been seeded to crested wheatgrass [Agropyron desertorum (Fischer ex Link) Shultes]. These ranges are generally nutritionally inadequate for sheep (Ovis aries L.), except for short grazing periods in the spring and fall. To increase production and diversity, particularly crude protein for late-season grazing, fourwing saltbush [Atriplex canescens (Pursch.) Nutt.] was planted in an existing stand of crested wheatgrass. Quantification of sheep forage preferences on these improved ranges aids in determining the length of the grazing season and the extent to which shrubs provide the supplemental nutrition required. This seasonal grazing study was conducted on a characteristic …

2005 Weed Science Research Report – Pink Section, Ndsu Weed Science, Dept. Of Plant Sciences

Plant Sciences Weed Science Reports

The Weed Science team at North Dakota State University conduct field research in the State of North Dakota. This specific document reports on field research conducted in 2005. It includes work on spotted knapweed, leafy spurge and Canada thistle in North Dakota.

Review Of "Photosynthesis - Regulation Under Varying Light Regimes", Jennifer L. Funk

Biology, Chemistry, and Environmental Sciences Faculty Articles and Research

This is a review of "Photosynthesis: Regulation Under Varying Light Regimes." By V S Rama Das. Enfield (New Hampshire): Science Publishers. $65.00. viii + 175 p; ill.; author and subject indexes. ISBN: 1-57808-343-5. 2004.

Variation In Isoprene Emission From Quercus Rubra: Sources, Causes, And Consequences For Estimating Fluxes, Jennifer L. Funk, Clive G. Jones, Dennis W. Gray, Heather L. Throop, Laura A. Hyatt, Manuel T. Lerdau

Biology, Chemistry, and Environmental Sciences Faculty Articles and Research

Isoprene is the dominant volatile organic compound produced in many forest systems. Uncertainty in estimates of leaf level isoprene emission rate stems from an insufficient understanding of the patterns and processes controlling isoprene emission capacity in plant leaves. Previous studies suggest that variation in isoprene emission capacity is substantial; however, it is not known at what scale emission capacity is the most variable. Identifying the sources of variation in emission capacity has implications for conducting measurements and for model development, which will ultimately improve emission estimates and models of tropospheric chemistry. In addition, understanding the sources of variation will help …

Predicting Childhood Sexual Or Physical Abuse: A Logistic Regression Geo-Mapping Approach To Prevention, Roland K. Tadoum, Kamila Smolij, Michelle A. Lyn, Craig W. Johnson

Faculty, Staff and Student Publications

This study investigates the degree to which gender, ethnicity, relationship to perpetrator, and geomapped socio-economic factors significantly predict the incidence of childhood sexual abuse, physical abuse and non- abuse. These variables are then linked to geographic identifiers using geographic information system (GIS) technology to develop a geo-mapping framework for child sexual and physical abuse prevention.

Using Technology To Teach Technology: Design And Evaluation Of Bilingual Online Physician Education About Electronic Medical Records, Sarah R. Edmonson, Adol Esquivel, Pallavi Mokkarala, Craig W. Johnson, Cynthia L. Phelps

Faculty, Staff and Student Publications

The "EMR Tutorial" is designed to be a bilingual online physician education environment about electronic medical records. After iterative assessment and redesign, the tutorial was tested in two groups: U.S. physicians and Mexican medical students. Split-plot ANOVA revealed significantly different pre-test scores in the two groups, significant cognitive gains for the two groups overall, and no significant difference in the gains made by the two groups. Users rated the module positively on a satisfaction questionnaire.

Inhibition Modifies The Effects Of Slow Calcium-Activated Potassium Channels On Epileptiform Activity In A Neuronal Network Model, Keun-Hang Susan Yang, Piotr J. Franaszczuk, Gregory K. Bergey

Mathematics, Physics, and Computer Science Faculty Articles and Research

Generation of epileptiform activity typically results from a change in the balance between network excitation and inhibition. Experimental evidence indicates that alterations of either synaptic activity or intrinsic membrane properties can produce increased network excitation. The slow Ca2+-activated K+ currents (sI AHP) are important modulators of neuronal firing rate and excitability and have important established and potential roles in epileptogenesis. While the effects of changes in sI AHP on individual neuronal excitability are readily studied and well established, the effects of such changes on network behavior are less well known. The experiments here utilize a defined small network model of …

Tooele County Agriculture Profile, Utah State University Extension

All Current Publications

No abstract provided.

Wasatch County Agriculture Profile, Utah State University Extension

All Current Publications

No abstract provided.

Weber County Agriculture Profile, Utah State University Extension

All Current Publications

No abstract provided.