Life Sciences Commons^™

The Reproductive Biology And Edaphic Characteristics Of A Rare, Gynodioecious Saxifage: Saxifraga Bryophora Var. Tobiasiae (Saxifragaceae), Kimberly Pierson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

I examined the reproductive biology and general ecology of Saxifraga bryophora var. tobiasiae, a rare saxifrage endemic to the West Salmon River Mountains of central Idaho. Saxifraga bryophora var. tobiasiae combines asexual reproduction via bulbils with a sexual mixed-mating system. Flower production occurred in 1996 only, whereas bulbil production occurred in 1995, 1996, and 1997. Bulbil production precedes floral bud formation and is the dominant form of reproduction. When flowering occurs, outcrossing is promoted by protandry and the gynodioecious mating system found in all populations. No autogamous or agamospermous seed set was observed in either female or hermaphrodite flowers, …

Interaction Between Winter Dominance And Territory Defense In Male Pronghorn Antelope, Antilocapra Americana, Charles William Gunnels Iv

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In a territorial population of pronghorn from Antelope Island, UT, interaction between male dominance and territory defense was examined. High-ranking males were more likely to defend territories. Closely ranked animals engaged in more dominance interactions than distantly ranked individuals, and middle-ranked animals were involved in disproportionately more interactions than either high- or low-ranking animals. Large males possessed large horns and prongs as well as small cheek patches. Results from a factor analysis suggested that large males defended territories with a high density of sage. However, in this study, we did not observe pronghorn feed on sage during the territorial season. …

A Social Analysis Of Grazing Management On National Forest Lands: A Case Study In Catron County, New Mexico, Alexis S. Watts

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The rural west in this country faces increased national pressure concerning the management of natural resources on public lands. Issues regarding natural resource management are becoming more important as they continue to affect rural communities and capture the attention of a variety of interest groups. Natural resource managers are increasingly required to consider social dimensions of resource use and management. Lack of consideration in these areas can lead to dissatisfied, and even hostile, local residents and interest groups. Often land managers face criticism from many groups at once as a result of management decisions.

This study analyzed a particular resource …

The Ecology And Life History Of The Mexican Tetra, Astyanax Mexicanus, (Teleostei: Characidae) In The Lower Rio Grande Valley, Texas, Mario Estrada

Theses and Dissertations - UTB/UTPA

The Mexican tetra has been found to migrate from shallow waters in the spring and summer months into deeper waters during the winter months when temperatures are too cold for their survival. This fish is omnivorous with insect material being the major source of food. Its food types include green algae, nematoceran larvae, hemipterans, coleopterans, hymenopterans, dipterans, ostracods, fish eggs and amphipods. Furthermore, size classes showed that the Mexican tetras reached their largest size at the River site and smaller sizes at the Bridge and Gate sites and apparently breed year round. They are capable of producing from 300 to …

Mutational Analysis Of The Role Of Hpr In Listeria Monocytogenes, Douglas P. Christensen, Andrew K. Benson, Robert W. Hutkins

Department of Food Science and Technology: Faculty Publications

The regulatory role of HPr, a protein of the phosphotransferase system (PTS), was investigated in Listeria monocytogenes. By constructing mutations in the conserved histidine 15 and serine 46 residues of HPr, we were able to examine how HPr regulates PTS activity. The results indicated that histidine 15 was phosphorylated in a phosphoenolpyruvate (PEP)-dependent manner and was essential for PTS activity. Serine 46 was phosphorylated in an ATP-dependent manner by a membrane-associated kinase. ATP-dependent phosphorylation of serine 46 was significantly enhanced in the presence of fructose 1,6-diphosphate and resulted in a reduction of PTS activity. The presence of a charge …

The Comparison Of Gait Characteristics Between Older Adults Who Do Tai-Chi Chuan And Older Adults Who Do Not Do Tai-Chi Chuan, Shu-Ya Chen

Rehabilitation Sciences Theses & Dissertations

Tai-Chi Chuan (TCC) is a traditional Chinese exercise which has become popular in the Western world recently. The reported health benefits of TCC exercise include increased lower extremity muscle strength, improved balance, improved cardiopulmonary function, reduced tension, and improved overall wellness. However, no study has demonstrated the effects of TCC exercise on walking performance. The purpose of this study is to determine whether TCC exercise has an effect on normal speed walking of older adults. Twenty-four older healthy women over 55 were recruited in this study, 12 subjects practiced TCC exercise at least two times per week and the others …

The Accuracy Of Nitrous Oxide Passive Dosimeters As Compared With An Infra-Red Spectrographic Reference Method, Susan Allen

Community & Environmental Health Theses & Dissertations

Nitrous oxide is a gas often used in dental, surgical and veterinary operations as an anesthetic agent. Employees stationed in proximity of fugitive gas emissions may potentially suffer adverse health effects from chronic exposure to this agent. Passive dosimeters can be worn in the breathing zone of potentially affected personnel during exposure periods, then later analyzed to quantify nitrous oxide exposure. This study sought to establish the accuracy of several commercially available passive monitoring devices for nitrous oxide by comparison against an infra-red spectrophotometric reference method.

Effect Of A 17 Day Spaceflight On Contractile Properties Of Human Soleus Muscle Fibres, Jeffrey J. Widrick, Shannon T. Knuth, Kris M. Norenberg, Janell A. Romatowski, James L. W. Bain, Danny A. Riley, M. Karhanek, S. W. Trappe, Todd A. Trappe, David Costill, Robert H. Fitts

Biological Sciences Faculty Research and Publications

1. Soleus biopsies were obtained from four male astronauts 45 days before and within 2 h after a 17 day spaceflight. 2. For all astronauts, single chemically skinned post-flight fibres expressing only type I myosin heavy chain (MHC) developed less average peak Ca¥ activated force (Pï) during fixed-end contractions (0·78 ± 0·02 vs. 0·99 ± 0·03 mN) and shortened at a greater mean velocity during unloaded contractions (Vï) (0·83 ± 0·02 vs. 0·64 ± 0·02 fibre lengths s¢) than preflight type I fibres. 3. The flight-induced decline in absolute Pï was attributed to reductions in fibre diameter and Ï or …

Betaine As Partial Replacement Of Dl-Methionine Or Methionine Hydroxy Analogue In Broiler And Layer Diets, Celina Donna Querubin Bantoc

Graduate Student's Output

Two experiments were conducted to determine the effect of betaine as partial replacement of dl-methionine (DLM) and methionine hydroxy analogue (MHA) on the performance of broilers and layers. In experiment 1, forty-five (45) individually caged 24-week old pullets were randomly assigned to five treatments following a completely randomized design (CRD). RAch treatment was replicated 9 times with one pullet per replicate. In experiment 2, three hundred (300) day-old broiler chicks were randomly distributed to five dietary treatments following a completely randomized design_ Each treatment was replicated six timOes with 10 birds per replicate. In the layer experiment, pullets fed methionine …

Energy Conservation With Irrigation Water Management, Robert Hill

All Current Publications

Irrigators in Utah experienced rapidly increasing energy costs from the mid 1970s to the late 1980s. These costs remain relatively high. Those who are pumping from deep wells are particularly interested in ways to cut back on energy use without doing away with profitability or production

How Good Is Your Water Measurement?, Robert Hill

All Current Publications

Accurate water measurement is essential to maintaining equity of water delivery within an irrigation company or water districts. Good management of our scarce water resource is dependent upon quantifying supplies and uses with accurate measurement techniques. State water rights adjudication and management procedures often require installation of water measurement devices and keeping records of flows.

Hexapod Herald - Vol. 11, No. 2, April 30, 1999

Hexapod Herald and Other Entomology Department Newsletters

Calendar of events

Grants

Welcome

Graduate student news

Congratulations

Presentations

Publications

Travel

From the office

Survey Of Exotic Plants Along The Blue Ridge Parkway Between Lower Otter Creek And Sunset Field, Cynthia Diane Gastineau Lane

Theses & Honors Papers

The objective of this study was to identify and inventory exotic plant vegetation along a portion of the Blue Ridge Parkway and to determine which species, if any, are invading the adjacent forest and the extent to which these invasions occur. The methods used were derived from those developed by James Akerson at Shenandoah National Park in 1997. Six transects were studied along the Blue Ridge Parkway. Each transect included two to five 100 square meter plots. The first plot of each site was centered at the border between the mowed area and the natural area. The second plots were …

Claytonia Virginica L., Vern Lagesse, I. Ingram

Specimens by Name

No abstract provided.

Viola Sororia Willd., Vern Lagesse, I. Ingram

Specimens by Name

No abstract provided.

Cropwatch No. 99-7, April 30, 1999, Lisa Brown Jasa

Crop Watch (1994–2005)

Inside

Focus On Soybeans II

Updates/Precipitation …………..58

Soybean Field Days in August…………..59

Scout for Spring Black Stem…………..60

Corn/Soybean Rotation Economics…………..61

Weed Control in Soybeans …………..63
Table of Herbicide Efficacy …………..64

Crop Report …………..65

Phosphorus Placement in No-Till …………..66

Coupling Between Bacterioplankton Species Composition, Population Dynamics, And Organic Matter Degradation, Jarone Pinhassi, Farooq Azam, Johanna Hemphälä, Richard A. Long, Josefina Martinez, Ulla Li Zweifel, Åke Hagström

Faculty Publications

To study the effect of substrate addition on short term bacterial population dynamics and species composition in seawater mesocosms were maintained with water collected off Scripps Pier (La Jolla, California USA) Protein enrichment (BSA) triggered a dynamic response from the microbial food web, whereas enrichment with starch had no effect. In the protein enriched mesocosm the number of both nucleoid-containing cells and metabolically active cells increased by 3.0 X 10⁵ cells ml^-1 from Day 1 to Day 4 In the same time period the density of a set of 31 phylogenetically different bacteria (α- and g-Proteobactena as well …

Relationship Of Egg Position During Incubation To Embryonic Growth And Mortality, Hatchability, And Chick Weight Of Broiler Breeder Eggs, Daniel Ryan Petrolia

Honors Capstones

No abstract provided.

Genetic\ Agronomic And Quality Comparisons Of Two 1al.1rs. Wheat-Rye Chromosomal Translocations, Robert A. Graybosch, J.-H. Lee, C. J. Peterson, D. R. Porter, O. K. Chung

Department of Agronomy and Horticulture: Faculty Publications

The 1AL.1RS wheat-rye chromosomal translocation originally found in ‘Amigo’ wheat possesses resistance genes for stem rust, powdery mildew and greenbug biotypes B and C, but also has a negative effect on wheat processing quality. Recently, a second 1AL.1RS translocation carrying Gb6 a gene conferring resistance to greenbug biotypes B, C, E, G and I, was identified in the wheat germplasm line ‘GRS1290’. Protein analytical methods, and the DNA polymerase chain reaction were used to identify markers capable of differentiating the 1RS chromosome arms derived from ‘Amigo’ and ‘GRS1201’. The secalin proteins encoded by genes on 1RS chromosome arms differed in …

Evidence That Cys230 And Lys238 Of Biotin Carboxylase Do Not Act As An Acid-Base Pair To Deprotonate Biotin, Robert Brett Lloyd

Honors Capstones

No abstract provided.

The Role Of Four Active Site Residues In The Catalytic Mechanism Of Biotin Carboxylase, Patrick Frantom

Honors Capstones

No abstract provided.

A Computer Assisted Study Guide For Viral Hepatitis, April, 1999, Diana Hullihen

Theses and Dissertations

The purpose of this project was to design a computer assisted program that would enhance the effectiveness of instruction in a clinical laboratory science program. Computer assisted instruction has been proven to be a beneficial and effective method of meeting educational objectives.

The topic of viral hepatitis is a complex and difficult one to teach. The instructor decided to supplement traditional lecture using computer assisted instruction. The goals and objectives of the lesson would be reinforced through this method as well as help the student to master the subject content.

The computer assisted study guide was designed to enhance the …

Variance Components And Breeding Values For Growth Traits From Different Statistical Models, G. B. Ferreira, M. D. Macneil, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

Estimates of genetic parameters resulting from various analytical models for birth weight (BWT, n = 4,155), 205-d weight (WWT, n = 3,884), and 365-d weight (YWT, n = 3,476) were compared. Data consisted of records for Line 1 Hereford cattle selected for postweaning growth from 1934 to 1989 at ARSUSDA, Miles City, MT. Twelve models were compared. Model 1 included fixed effects of year, sex, age of dam; covariates for birth day and inbreeding coefficients of animal and of dam; and random animal genetic and residual effects. Model 2 was the same as Model 1 but ignored inbreeding coefficients. Model …

How Proteins Fold, Flex, And Bind Other Molecules, Leslie A. Kuhn, Volker Schnecke, Michael L. Raymer, Paul C. Sanschagrin

Kno.e.sis Publications

No abstract provided.

Iowa Academy Of Science President's Banquet [111th Session], Iowa Academy Of Science

Iowa Academy of Science Documents

Program:

Introductions
Awards:
Distinguished Iowa Science Teaching: Somnath Sarkar
Distinguished Iowa Scientist: Steve Feller
Distinguished Service: Daryl Smith
President's Address - James Christiansen
Response - Neil Bernstein, President-Elect
General Sessions II - Dr. Charles M. Tipton, "The Iowa Wrestling Studies: From Athens to Iowa City"

Cropwatch No. 99-6, April 23, 1999, Lisa Brown Jasa

Crop Watch (1994–2005)

Inside

Focus On Soybeans

Field Updates …………48

Precipitation …………48

Soybean Seeding Rates………… 50

Seed Quality Essential………… 52

Planting To Avoid Diseases………… 53

Comparing Weed Control Costs …………54

Nebraska Weed Tour …………55

Adding Weight in No-Till………… 55

Selecting Row Width …………56

Development Of The Suprarostral Plate Of Pipoid Frogs, Rafael O. De Sá, Charles C. Swart

Biology Faculty Publications

The rostral region of nonpipoid tadpoles has two sets of cartilages, the cornua trabeculae and the suprarostral cartilages, whereas the rostral region in pipoid larvae is occupied by a single and continuous cartilage, the suprarostral plate. The homology of this region in pipoid and nonpipoids tadpoles has been controversial. We examined the early formation and development of the suprarostral plate using serially cross-sectioned specimens of Rhinophrynus, Xenopus, and Hymenochirus. We conclude that the cartilaginous structures present in the rostral area of pipoid and nonpipoid larvae are homologous. Furthermore, we found two different developmental patterns among pipoid larvae. The chondrocranium …

Program Abstracts, 111th Session, Iowa Academy Of Science, April 23-24, 1999, Iowa Academy Of Science

Iowa Academy of Science Documents

Presentation abstracts from the annual meeting of the Iowa Academy of Science

111th Session Iowa Academy Of Science Awards Luncheon, April 23, 1999, Iowa Academy Of Science

Iowa Academy of Science Documents

Program:

--- Introductions - James Christiansen, President
--- Recognition of students participating in various statewide activities - Ed Rezabek, Chair, Student Programs Committee
--- Presentation of scholarship winners and 2000 AJAS representiatives - Brenda Jordan, Interim Director, Iowa Junior Academy of Science
--- Presentation of Excellence in Science Teaching Awards - Peg Steffen, Director, ESTA Program

This Cat's Meow: Individual Variation Among Domestic Cats In Maternal Response To An Unrelated Kitten, Theressa Joanne Silver

Dissertations and Theses

Non-offspring nursing and adoption are puzzling behaviors seen in a number of mammalian species (Riedman, 1982; Packer et al., 1992). Although domestic cats show a proclivity for adopting strange kittens, there is a great deal of individual variation in the behavior. The goal of this project was to determine the feasibility of using behavioral observations and other measures of a mother cat's personality to predict her reaction to a strange kitten. Twelve female domestic cats with litters of kittens were tested. Three behavioral tests were done with each cat: New Person Test (NPT), Familiar Person Test (FPT), and Novel Box …