Open Access. Powered by Scholars. Published by Universities.®

Life Sciences Commons

Open Access. Powered by Scholars. Published by Universities.®

Articles 1 - 22 of 22

Full-Text Articles in Life Sciences

Characterization Of Biochelators, Membrane Redox Systems, And Quinone Reductases From Wood Degrading Basidiomycetes, Weihong Qi Dec 2001

Characterization Of Biochelators, Membrane Redox Systems, And Quinone Reductases From Wood Degrading Basidiomycetes, Weihong Qi

Electronic Theses and Dissertations

Biodegradation of wood by brown rot fungi is dependent upon a non-enzymatic system involving Fenton chemistry. Iron biochelators with molecular weights lower than 1kD are important components in this process. Phenolate biochelators drive a hydroxyl radical generating Fenton reaction by reducing ferric iron. Biochelators may be mineralized or alternately, in some cases oxidized biochelators may be regenerated via a quinone redox cycle. Electron donors for this postulated regeneration have not been identified. Extracellular cellobiose dehydrogenase has also been found to drive the Fenton reaction by generating ferrous iron and hydrogen peroxide. This research compared the production of biochelators and the ...


Identification Of Chromosomes In Plants Using Standard Staining Techniques, L. Michael Hill Ph.D. Oct 2001

Identification Of Chromosomes In Plants Using Standard Staining Techniques, L. Michael Hill Ph.D.

Biology Faculty Scholarship

No abstract provided.


Optimizing The Oil Extraction/Water Adsorption Step In Sequential Extraction Processing Of Corn, Kathrine V. Miller, Mila P. Hojilla-Evangelista, Lawrence A. Johnson Jul 2001

Optimizing The Oil Extraction/Water Adsorption Step In Sequential Extraction Processing Of Corn, Kathrine V. Miller, Mila P. Hojilla-Evangelista, Lawrence A. Johnson

Food Science and Human Nutrition Publications

The Sequential Extraction Process (SEP) uses ethanol to extract oil and protein from cracked, flaked, and dried corn, and the corn simultaneously dehydrates the ethanol. The optimum conditions to reduce zein extraction in the oil extraction/water adsorption step of SEP involved a single–pass system using 15 length/diameter ratio extraction cells, 30% hexanes: 70% ethanol, and 56C extraction temperature, which improved the efficiencies of oil extraction from the corn and moisture adsorption from the ethanol. The extract contained only 0.1% protein in the desolventized solids. The moisture content of the solvent was reduced to 1.03%, and ...


Isoetes Mattaponica (Isoetaceae), A New Diploid Quillwort From Freshwater Tidal Marshes Of Virginia, Lytton John Musselman, W. Carl Taylor, Rebecca D. Bray Jul 2001

Isoetes Mattaponica (Isoetaceae), A New Diploid Quillwort From Freshwater Tidal Marshes Of Virginia, Lytton John Musselman, W. Carl Taylor, Rebecca D. Bray

Biological Sciences Faculty Publications

Isoetes mattaponica is a rare quillwort of freshwater tidal rivers of eastern Virginia with a somatic chromosome number of 2n = 22. Megaspores have low rugulate muri on both the proximal and distal surfaces; the girdle is broad. Microspores are echinate-spinose with ornamented spines. Isoetes mattaponica may be one of the parents of several polyploids in the Southeastern United States.


Seasonal Patterns Of Photosynthesis In Douglas Fir Seedlings During The Third And Fourth Year Of Exposure To Elevated Co2 And Temperature, James D. Lewis, Melissa S. Lucash, David M. Olszyk, David T. Tingey May 2001

Seasonal Patterns Of Photosynthesis In Douglas Fir Seedlings During The Third And Fourth Year Of Exposure To Elevated Co2 And Temperature, James D. Lewis, Melissa S. Lucash, David M. Olszyk, David T. Tingey

Environmental Science and Management Faculty Publications and Presentations

The interactive effects of elevated atmospheric CO2 and temperature on seasonal patterns of photosynthesis in Douglas fir (Psuedotsuga menziesii (Mirb.) Franco) seedlings were examined. Seedlings were grown in sunlit chambers controlled to track either ambient (~400 p.p.m.) CO2 or ambient +200 p.p.m. CO2, and either ambient temperature or ambient +4 °C. Light-saturated net photosynthetic rates were measured approximately monthly over a 21 month period. Elevated CO2 increased net photosynthetic rates by an average of 21% across temperature treatments during both the 1996 hydrologic year, the third year of exposure, and the 1997 ...


First Report Of Columbia Root Knot Nematode (Meloidogyne Chitwoodi) In Potato In Texas, A. L. Szalanski, P. G. Mullin, T. S. Harris, T. O. Powers Apr 2001

First Report Of Columbia Root Knot Nematode (Meloidogyne Chitwoodi) In Potato In Texas, A. L. Szalanski, P. G. Mullin, T. S. Harris, T. O. Powers

Papers in Plant Pathology

Columbia root-knot nematode, Meloidogyne chitwoodi Golden et al. (1) was identified from potatoes, Solanum tuberosum L., collected from Dallam County, Texas in October 2000. Seed potatoes are the most likely source for this introduction. This nematode is currently found infecting potatoes grown in California, Colorado, Idaho, New Mexico, Nevada, Oregon, Utah, and Washington. Some countries prohibit import of both seed and table stock potatoes originating in states known to harbor M. chitwoodi. Lesions on the potatoes had discrete brown coloration with white central spots in the outer 1 cm of the tuber flesh. Female nematode densities averaged 3 per square ...


Crop Updates 2001 - Lupins, Mark Sweetingham, Beven J. Buirchell, Bob French, Laurie Wahlsten, Janet Wtoth, Kirsty Bayliss, Wallace Cowling, R. F. Brennan, Miles Dracup, Nick Galwey, Bob Thomsom, Moin Salam, Art Diggle, Geoff Thomas, Bill O'Neill, Debbie Thackray, Kevin Walden, M. Shankar, Dominie Wright, Nichole Burges, Hu'aan Yang, Ming Pei You, David Bowran, Abul Hashem, Nerys Wilkins, Aik Cheam, Terry Piper, Paul Blackwell, Miles Obst, Andrew Sandison, Cameron Weeks, Erin Hasson, Luigi Moreschi, Brett Glencross, Jon Clements, Miles Dracup, Ramon Hall, Stuart Johnson, Madeleine Ball, Sofia Sipsas, David Petterson Feb 2001

Crop Updates 2001 - Lupins, Mark Sweetingham, Beven J. Buirchell, Bob French, Laurie Wahlsten, Janet Wtoth, Kirsty Bayliss, Wallace Cowling, R. F. Brennan, Miles Dracup, Nick Galwey, Bob Thomsom, Moin Salam, Art Diggle, Geoff Thomas, Bill O'Neill, Debbie Thackray, Kevin Walden, M. Shankar, Dominie Wright, Nichole Burges, Hu'aan Yang, Ming Pei You, David Bowran, Abul Hashem, Nerys Wilkins, Aik Cheam, Terry Piper, Paul Blackwell, Miles Obst, Andrew Sandison, Cameron Weeks, Erin Hasson, Luigi Moreschi, Brett Glencross, Jon Clements, Miles Dracup, Ramon Hall, Stuart Johnson, Madeleine Ball, Sofia Sipsas, David Petterson

Crop Updates

This session covers twenty six papers from different authors:

INTRODUCTION,

1. Introduction, Dr Mark Sweetingham LUPIN RESEARCH AND INDUSTRY DEVELOPMENT, Agriculture Western Australia

VARIETIES

2. Lupin variety performance: Are you making the most of it? Bevan J. Buirchell, Agriculture Western Australia

3. Adaption of restricted-branching lupins in Western Australia, Bob French and Laurie Wahlsten, Agriculture Western Australia

4. Isolated microspore culture of lupin for production of doubled haploids, Dr Janet Wroth, Dr Kirsty Bayliss and A/Prof. Wallace Cowling, Plant Sciences, Faculty of Agriculture, The University of Western Australia

NUTRITION

5. Banding manganese fertiliser below the seed increases seed yields ...


Crop Updates 2001 - Grower Booklet, Graeme Robertson, Jatinderpal Bathal, Cameron Weeks, Kith Jayasena, Robert Loughman, Bill Bowden, Chris Gazey, Ross Brennan, Ian Foster, Q. Knight, Ross Kingwell, S. B. Sharma, S. Kelly, Glen Mcdonald, Kevin Young, Blakely Paynter, Keith Devenish, Abul Hasham, Nerys Wilkins, Terry Piper, Sally Peltzer, Clinton Revell, Candy Hudson, Ian Rose, Alexandra Wallace, Paul Blackwell, Miles Obst, David Bowran, Bevan J. Buirchell, Moin Salam, Art Diggle, Geoff Thomas, Mark Sweetingham, Bill O'Neill, Rafiul Alam, Glen Riethmuller, Greg Hamilton, Paul Carmody, G. Walton, B. Macleod, M. Seymour, H. Dhammu, D. Nicholson, M. D'Antuono Feb 2001

Crop Updates 2001 - Grower Booklet, Graeme Robertson, Jatinderpal Bathal, Cameron Weeks, Kith Jayasena, Robert Loughman, Bill Bowden, Chris Gazey, Ross Brennan, Ian Foster, Q. Knight, Ross Kingwell, S. B. Sharma, S. Kelly, Glen Mcdonald, Kevin Young, Blakely Paynter, Keith Devenish, Abul Hasham, Nerys Wilkins, Terry Piper, Sally Peltzer, Clinton Revell, Candy Hudson, Ian Rose, Alexandra Wallace, Paul Blackwell, Miles Obst, David Bowran, Bevan J. Buirchell, Moin Salam, Art Diggle, Geoff Thomas, Mark Sweetingham, Bill O'Neill, Rafiul Alam, Glen Riethmuller, Greg Hamilton, Paul Carmody, G. Walton, B. Macleod, M. Seymour, H. Dhammu, D. Nicholson, M. D'Antuono

Crop Updates

1. Strategies for leaf disease management in wheat, Jatinderpal Bhathal1, Cameron Weeks2, Kith Jayasena1 and Robert Loughman1, 1Agriculture Western Australia. 2Mingenew-Irwin Group Inc.

2. Burn stubble windrows: to diagnose soil fertility problems, Bill Bowden, Chris Gazey and Ross Brennan, Agriculture Western Australia

3. Rainfall – what happened in 2000 and the prospects for 2001, Ian Foster, Agriculture Western Australia

4. Strategies for leaf disease management in malting barley, K. Jayasena1, Q. Knight2 and R. Loughman1, 1Agriculture Western Australia, 2IAMA Agribusiness

5. Planning your cropping program in season 2001, Dr Ross Kingwell, Agriculture Western Australia ...


Virulence Of Puccinia Triticina On Wheat In Nebraska During 1997 And 1998, J. E. Watkins, J. Schimelfenig, P. Stephen Baenziger, Kent M. Eskridge Feb 2001

Virulence Of Puccinia Triticina On Wheat In Nebraska During 1997 And 1998, J. E. Watkins, J. Schimelfenig, P. Stephen Baenziger, Kent M. Eskridge

Papers in Plant Pathology

Urediniospore isolates of Puccinia triticina were obtained from wheat leaf collections made in three wheat-growing regions in Nebraska in 1997 and in four regions in 1998. Using 16 Thatcher lines that are near-isogenic for leaf rust resistance, 17 virulence phenotypes were found among 121 single uredinial isolates in 1997, and 42 virulence phenotypes were found among 178 isolates in 1998. The most prevalent phenotype in 1997 was MDRR (virulent on Lr1, 3, 3ka, 10, 11, 18, 23, 24, and 30). In 1998, virulence phenotypes MDRR and MDRM (virulent on Lr1, 3, 3ka, 10, 11, 23, 24, and 30) were the ...


Age-Related Resistance In Bell Pepper To Cucumber Mosaic Virus , Hernan Garcia-Ruiz, John F. Murphy Jan 2001

Age-Related Resistance In Bell Pepper To Cucumber Mosaic Virus , Hernan Garcia-Ruiz, John F. Murphy

Papers in Plant Pathology

We demonstrated the occurrence of mature plant resistance in Capsicum annuum 'Early Calwonder' to Cucumber mosaic virus (CMV) under greenhouse conditions. When Early Cal wonder plants were sown at 10 day intervals and transplanted to 10-cm square pots, three distinct plant sizes were identified that were designated small, medium and large. Trials conducted during each season showed that CMV accumulated in inoculated leaves of all plants of each size category. All small plants (with the exception of the winter trial) developed a systemic infection that included accumulation of CMV in uninoculated leaves and severe systemic symptoms. Medium plants had a ...


Origin And Conservation Genetics Of Threatened Ute Ladies’-Tresses, Spiranthes Diluvialis (Orchidaceae), Allen L. Szalanski, Gerry Steinauer, Richard Bischof, Jessica Lynn Petersen Jan 2001

Origin And Conservation Genetics Of Threatened Ute Ladies’-Tresses, Spiranthes Diluvialis (Orchidaceae), Allen L. Szalanski, Gerry Steinauer, Richard Bischof, Jessica Lynn Petersen

Faculty Papers and Publications in Animal Science

The Ute ladies’-tresses, Spiranthes diluvialis, is listed as a threatened orchid in west-central United States by the Federal government. Information on its origin and patterns of genetic variation is needed to develop effective conservation strategies for this species. DNA sequencing and polymerase chain reaction–restriction fragment length polymorphism (PCR-RFLP) was used to evaluate genetic variation and structure of 23 populations of S. diluvialis. In addition, four congeneric species were analyzed to determine possible origins of the putative allotetraploid S. diluvialis. DNA sequencing and PCR-RFLP analysis of the nuclear ribosomal internal transcribed spacer (ITS) and mitochondrial and chloroplast DNA noncoding ...


The Aspergillus Nidulans Snt Genes Are Required For The Regulation Of Septum Formation And Cell Cycle Checkpoints, Peter R. Kraus, Steven D. Harris Jan 2001

The Aspergillus Nidulans Snt Genes Are Required For The Regulation Of Septum Formation And Cell Cycle Checkpoints, Peter R. Kraus, Steven D. Harris

Papers in Plant Pathology

In Aspergillus nidulans, germinating conidia undergo multiple rounds of nuclear division before forming a septum. Previous genetic results suggest that the ability to separate nuclear division and septum formation depends upon a threshold level of activity of the cyclin-dependent kinase NIMXcdk1. Mutations in nimX and nimT, the gene encoding the NIMXcdk1-activating phosphatase, have revealed that Tyr-15 phosphorylation is important for determining the timing of the formation of the first septum. Here, we describe a screen for suppressors of nimT23 (snt), designed to identify additional components of the pathway regulating septum formation. We show that a subset of the snt mutants ...


Effects Of Elevated Co2 On The Response Of Phleum Pratense And Poa Pratensis To Aboveground Defoliation And Root-Feeding Nematodes, Brian J. Wilsey Jan 2001

Effects Of Elevated Co2 On The Response Of Phleum Pratense And Poa Pratensis To Aboveground Defoliation And Root-Feeding Nematodes, Brian J. Wilsey

Brian J. Wilsey

Because of the importance of herbivory in many herbaceous plant–dominated ecosystems, it will be important to determine whether interactions exist between herbivory and CO2 enrichment if we are to understand better how ecosystems will respond to global change. In an experiment with the C3 grasses Poa pratensis and Phleum pratense, plants were grown together under ambient (360 ppm) and elevated (650 ppm) CO2, with and without aboveground defoliation, and with or without additions of the root-feeding nematode Pratylenchus penetrans. The objective was to determine whether herbivory would interact with CO2 enrichment in determining biomass responses or whether these factors ...


Selection And Evaluation Of Microorganisms For Biocontrol Of Fusarium Head Blight Of Wheat Incited By Gibberella Zeae, N. I. Khan, D. A. Schisler, Michael J. Boehm, P. J. Slininger, R. J. Bothast Jan 2001

Selection And Evaluation Of Microorganisms For Biocontrol Of Fusarium Head Blight Of Wheat Incited By Gibberella Zeae, N. I. Khan, D. A. Schisler, Michael J. Boehm, P. J. Slininger, R. J. Bothast

Papers in Plant Pathology

Gibberella zeae incites Fusarium head blight (FHB), a devastating disease that causes extensive yield and quality losses to wheat and barley. Of over 700 microbial strains obtained from wheat anthers, 54 were able to utilize tartaric acid as a carbon source when the compound was supplied as choline bitartrate in liquid culture. Four tartaric acid–utilizing and three nonutilizing strains reduced FHB in initial tests and were selected for further assays. Antagonists were effective against three different isolates of G. zeae when single wheat florets were inoculated with pathogen and antagonist inoculum. All seven antagonists increased 100-kernel weight when applied ...


Bacillus Species For Reducing Fusarium Head Blight In Cereals, David A. Schisler, Naseem I. Khan, Michael J. Boehm Jan 2001

Bacillus Species For Reducing Fusarium Head Blight In Cereals, David A. Schisler, Naseem I. Khan, Michael J. Boehm

Papers in Plant Pathology

Microbial antagonists that will suppress Fusarium head blight (head scab) in cereals, particularly in wheat and barley have been identified. Two superior antagonists include NRRL B-30210 and NRRL B-30211.


The Structure-Function Relationships Of Maize Starch Synthase, Zhong Gao Jan 2001

The Structure-Function Relationships Of Maize Starch Synthase, Zhong Gao

Retrospective Theses and Dissertations

This research was to study the structure-function relationships and catalytic mechanisms of maize starch synthase IIa (SSIIa). Chemical modification of maize SSIIa showed that pyridoxal-5-phosphate, which specifically modifies lysine residues, inactivated maize SSIIa activity in a time and concentration dependent manner. Substrate ADP-glucose completely protected SSIIa from inactivation by pyridoxal-5-phosphate, indicating that lysine residue(s) is important for ADP-glucose binding of maize SSIIa. To identify lysine residues possibly involved in substrate ADP-glucose binding, site-directed mutagenesis was used to generate mutants at conserved lysine sites. Lysine-193 located at the conserved KTGGL domain has been widely suggested as a putative ADP-glucose binding ...


The Genus Striga (Scrophulariaceae) In Africa, Kamal I. Mohamed, Lytton John Musselman, Charles R. Riches Jan 2001

The Genus Striga (Scrophulariaceae) In Africa, Kamal I. Mohamed, Lytton John Musselman, Charles R. Riches

Biological Sciences Faculty Publications

Twenty-eight species and six subspecies of the hemiparasitic genus Striga Lour., witchweed, occur in Africa. Twenty-two species are endemic. Witchweeds occur throughout the continent with greatest diversity in the grasslands and savannas north of the equator. Striga gesnerioides (Willd.) Vatke and S. hermonthica (Del.) Benth. have developed host-specific strains that may have distinct morphotypes. me accord these no formal taxonomic status. Striga hermonthica and S. asiatica (L.) Kuntze, limited to agroecosystems, may be recently derived from non-ruderal species. Striga hirsuta Benth. and S. lutea Lour., sometimes treated as conspecific with S. asiatica, are recognized as distinct species restricted to natural ...


Insertional Mutagenesis Of The Signal Transduction Pathway For Low Co2 Acclimation In Chlamydomonas Reinhardtii , Kyujung Van Jan 2001

Insertional Mutagenesis Of The Signal Transduction Pathway For Low Co2 Acclimation In Chlamydomonas Reinhardtii , Kyujung Van

Retrospective Theses and Dissertations

Chlamydomonas reinhardtii shows adaptive changes in order to survive in limiting CO2 conditions because they live in quite variable conditions of CO2 availability. We are trying to identify mutants defective in the acclimation response to limiting CO 2. Nuclear transformation to complement an Arg- phenotype was used to generate insertional mutants, and Cah1 expression and having high CO2-requiring (HCR) phenotype were used as reporters for induction of genes involved in acclimation to limiting CO 2.;Among a collection of insertionally generated mutants, a mutant has been isolated that showed no pCA1 protein and no Cah1 mRNA. This mutant strain, designated ...


Seed Physiology, Production & Technology: Germination, Emergence, And Yield Of 20 Plant-Color, Seed-Color Near-Isogenic Lines Of Grain Sorghum, Jeffrey F. Pedersen, J. J. Toy Jan 2001

Seed Physiology, Production & Technology: Germination, Emergence, And Yield Of 20 Plant-Color, Seed-Color Near-Isogenic Lines Of Grain Sorghum, Jeffrey F. Pedersen, J. J. Toy

Agronomy & Horticulture -- Faculty Publications

Although there is growing demand for sorghum [Sorghum bicolor (L.) Moench] with white seed and tan plant color, there is limited information on the overall agronomic fitness of sorghum with these characters. A set of experiments was conducted to evaluate the combined effects of plant color and seed color on sorghum germination, emergence, and agronomic performance. Twenty near-isogenic lines with red seed/tan plant (RT), red seed/purple plant (RP), white seed/ tan plant (WT), white seed/purple plant (WP) phenotypes were tested under field and laboratory conditions. Plant color X seed color interactions were not significant. Purple plant color ...


Genomic Regions That Underlie Soybean Seed Isoflavone Content, K. Meksem, V. N. Njiti, W. J. Banz, M. J. Iqbal, My. M. Kassem, David L. Hyten, J. Yuang, T. A. Winters, D. A. Lightfoot Jan 2001

Genomic Regions That Underlie Soybean Seed Isoflavone Content, K. Meksem, V. N. Njiti, W. J. Banz, M. J. Iqbal, My. M. Kassem, David L. Hyten, J. Yuang, T. A. Winters, D. A. Lightfoot

Agronomy & Horticulture -- Faculty Publications

Soy products contain isoflavones (genistein, daidzein, and glycitein)that display biological effects when ingested by humans and animals, these effects are species, dose and age dependent. Therefore, the content and quality of isoflavones in soybeans is a key to their biological effect. Our objective was to identify loci that underlie isoflavone content in soybean seeds. The study involved 100 recombinant inbred lines (RIL)fr om the cross of ‘Essex’ by ‘Forrest,’ two cultivars that contrast for isoflavone content. Isoflavone content of seeds fromeach RIL was determined by high performance liquid chromatography (HPLC). The distribution of isoflavone content was continuous and ...


Genetic Analysis Of Kafirins And Their Phenotypic Correlations With Feed Quality Traits, In Vitro Digestibility, And Seed Weight In Grain Sorghum, C. Hicks, S. R. Bean, G. L. Lookhart, Jeffrey F. Pedersen, K. D. Kofoid, M. R. Tuinstra Jan 2001

Genetic Analysis Of Kafirins And Their Phenotypic Correlations With Feed Quality Traits, In Vitro Digestibility, And Seed Weight In Grain Sorghum, C. Hicks, S. R. Bean, G. L. Lookhart, Jeffrey F. Pedersen, K. D. Kofoid, M. R. Tuinstra

Agronomy & Horticulture -- Faculty Publications

Twenty-three entries of grain sorghum (Sorghum bicolor (L.) Moench), including eight inbred lines (five males and three females) and 15 hybrids, were evaluated to determine the proportion of γ, αII, and β-αI-kafirins and their association with contents of crude protein, fat, and starch; protein digestibility; in vitro dry matter disappearance; and seed weight. The male lines included three normal-seeded lines (TX2737, TX435, and P954063) and two large-seeded lines (Eastin1 and PL-1). Female lines consisted of three common U.S. seed parent lines (Wheatland, Redlan, and SA3042). The lines and their hybrids were grown under dryland conditions at two locations in ...


Amaranthus Rudis And A. Tuberculatus, One Species Or Two? [Abstract], Donald B. Pratt, Lynn G. Clark Jan 2001

Amaranthus Rudis And A. Tuberculatus, One Species Or Two? [Abstract], Donald B. Pratt, Lynn G. Clark

Faculty Publications

No abstract provided.