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2009

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Articles 4441 - 4470 of 4545

Full-Text Articles in Life Sciences

Industrial Copper Intoxication Of Iranian Fat-Tailed Sheep In Kerman Province, Iran, Ali Asghar Mozaffari, Amin Derakhshanfar, Jamileh Salar Amoli Jan 2009

Industrial Copper Intoxication Of Iranian Fat-Tailed Sheep In Kerman Province, Iran, Ali Asghar Mozaffari, Amin Derakhshanfar, Jamileh Salar Amoli

Turkish Journal of Veterinary & Animal Sciences

An outbreak of industrial chronic copper poisoning in Iranian fat-tailed sheep in a region of southeast Iran is described. At least 10,000 out of 75,000 sheep (13.3%) originating from 50 flocks died over a period of 3 years in the Khatoon Abad region in Kerman province, Iran. The diagnosis was based on epidemiological, clinical, hematological, serum biochemical, urinalysis, necropsy and histopathological evaluations. Then findings were confirmed by toxicological analysis of liver and kidney samples. The details of epidemiological, clinical, laboratory and pathologic findings are described in the manuscript. These findings were indicative of chronic copper poisoning in affected sheep. Toxicological …

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Immunohistochemical Studies On S100 Reactivity In Chicks Experimentally Infected With Eimeria Tenella I: The Localization Of S100 Protein And Its Subunits \Alpha And \Beta In Stages Of Eimeria Tenella, Lati̇fe Beyaz, Ayhan Atasever, Feyzullah Beyaz, Anil İça Jan 2009

Immunohistochemical Studies On S100 Reactivity In Chicks Experimentally Infected With Eimeria Tenella I: The Localization Of S100 Protein And Its Subunits \Alpha And \Beta In Stages Of Eimeria Tenella, Lati̇fe Beyaz, Ayhan Atasever, Feyzullah Beyaz, Anil İça

Turkish Journal of Veterinary & Animal Sciences

The expression of the calcium-binding protein S100 and its subunits \alpha and \beta in the intracellular protozoon Eimeria tenella was investigated. For this purpose, anti-S100 whole molecule polyclonal antibody and anti-S100 \alpha and anti-S100 \beta monoclonal antibodies were used on paraffin sections collected from the cecum, ileum, colon, rectum, and bursa of Fabricius of chicks experimentally infected with E. tenella. One hundred seventy-five 2- to 3-day-old specific pathogen-free chicks were used. The chicks were divided into experiment and control groups, to include 94 and 81 chicks, respectively. All the chicks in the experimental group received 10,000 spored oocytes in 0.5 …

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Effect Of Leptin Gene Polymorphisms On Milk Production Traits Of Jersey Cows, Hanna Kulig, Marek Kmiec, Inga Kowalewska Luczak, Gabriela Andziak Jan 2009

Effect Of Leptin Gene Polymorphisms On Milk Production Traits Of Jersey Cows, Hanna Kulig, Marek Kmiec, Inga Kowalewska Luczak, Gabriela Andziak

Turkish Journal of Veterinary & Animal Sciences

A total of 181 Jersey cows were used to investigate how leptin gene polymorphisms affect milk production traits such as milk yield, fat and protein yield, and fat and protein content. Two single-nucleotide polymorphisms (SNPs) were genotyped, including the A59V in exon 3 and Sau3AI in intron 2. The genotype, allele, and haplotype frequencies were estimated. Statistical analysis revealed that the A59V polymorphism significantly affected the milk, protein, and fat yield (P Keywords: Leptin, SNP, Jersey cows, milk production traits

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Esophageal Diverticulum In A Cat, Mehmet Kazim Börkü, Kerem Ural, Murat Ki̇bar, Yunusemre Özkanlar, Murat Güzel, Cenker Çağri Cingi Jan 2009

Esophageal Diverticulum In A Cat, Mehmet Kazim Börkü, Kerem Ural, Murat Ki̇bar, Yunusemre Özkanlar, Murat Güzel, Cenker Çağri Cingi

Turkish Journal of Veterinary & Animal Sciences

A 7-year-old spayed female domestic shorthair cat was presented because of post-prandial regurgitation, gasping shortly after eating, weight loss, dyspnea, and tachypnea. Six months prior to the onset of these signs the cat had received nutritional support via gastrostomy and then nasogastric tubes. A diagnosis of esophageal diverticulum was made on the basis of clinical features, contrast esophagram, and endoscopy, and was considered a complication of tube feeding. Medical therapy, including parenteral fluids, ranitidine, metoclopramide, and cisapride, and a soft, bland low-fat diet resulted in improvement in the clinical signs within 1 week. The cat was discharged and recovery was …

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Dairy Farming In Kars District, Turkey: Iii. Neonatal Calf Health, Hi̇dayet Meti̇n Erdoğan, Ahmet Ünver, Mehmet Çi̇ti̇l, Vehbi̇ Güneş, Mükremi̇n Özkan Arslan, Mehmet Tuzcu, Hali̇l İbrahi̇m Gökce Jan 2009

Dairy Farming In Kars District, Turkey: Iii. Neonatal Calf Health, Hi̇dayet Meti̇n Erdoğan, Ahmet Ünver, Mehmet Çi̇ti̇l, Vehbi̇ Güneş, Mükremi̇n Özkan Arslan, Mehmet Tuzcu, Hali̇l İbrahi̇m Gökce

Turkish Journal of Veterinary & Animal Sciences

The study was designed to determine the health status of neonatal calves on dairy farms in Kars district. It involved retrospective questioning (2001 calving season) and prospective follow up (2002 calving season). The localities and farms were selected from a list using a 2-stage stratified random sampling method. Farms were weekly visited by authors during the 2002 calving season for clinical problems. A total of 624 calves, born on 45 farms from 7 different localities, were followed up in the 2002 calving season. On the same farms data were collected regarding 582 neonatal calves in the 2001 calving season by …

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Critical Commentary On 'Open Source' In The Life Sciences, Arti K. Rai Jan 2009

Critical Commentary On 'Open Source' In The Life Sciences, Arti K. Rai

Faculty Scholarship

No abstract provided.

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The Guinea Pig Ileum Lacks The Direct, High-Potency, M2-Muscarinic, Contractile Mechanism Of The Mouse Ileum, Michael T. Griffin, Minoru Matsui, Rennolds S. Ostrom, Frederick J. Ehlert Jan 2009

The Guinea Pig Ileum Lacks The Direct, High-Potency, M2-Muscarinic, Contractile Mechanism Of The Mouse Ileum, Michael T. Griffin, Minoru Matsui, Rennolds S. Ostrom, Frederick J. Ehlert

Pharmacy Faculty Articles and Research

We explored whether the M2 muscarinic receptor in the guinea pig ileum elicits a highly potent, direct-contractile response, like that from the M3 muscarinic receptor knockout mouse. First, we characterized the irreversible receptor-blocking activity of 4-DAMP mustard in ileum from muscarinic receptor knockout mice to verify its M3 selectivity. Then, we used 4-DAMP mustard to inactivate M3 responses in the guinea pig ileum to attempt to reveal direct, M2 receptor-mediated contractions. The muscarinic agonist, oxotremorine-M, elicited potent contractions in ileum from wild-type, M2 receptor knockout, and M3 receptor knockout mice characterized by negative log EC50 (pEC50) values ± SEM of …

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Arbuscular Mycorrhizal Fungi: Factors Affecting Soil Organic Matter Storage, Carl Lee Rosier Jan 2009

Arbuscular Mycorrhizal Fungi: Factors Affecting Soil Organic Matter Storage, Carl Lee Rosier

Graduate Student Theses, Dissertations, & Professional Papers

Arbuscular mycorrhizal fungi (AMF) are soil fungi forming symbiotic associations with majority of land plants. AMF alter soil organic matter (SOM) directly through stabilization of soil aggregates and indirectly providing a path in which plant fixed C02 is transferred below-ground. Understanding contributions of AMF to SOM via protein production and stabilization of soil aggregates will greatly aid our understanding of soil carbon sequestration, nutrient cycling and mitigation of soil erosion. The work presented in chapter 2 challenges the glomalin extraction process and assesses the accuracy of the Bradford and monoclonal-antibody ELISA detection methods. My results clarify the contribution of glomalin …

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Ecology And Molecular Phylogenetics Of Hydnora (Hydnoraceae) In Southern Africa, Jay Francis Bolin Jan 2009

Ecology And Molecular Phylogenetics Of Hydnora (Hydnoraceae) In Southern Africa, Jay Francis Bolin

Biological Sciences Theses & Dissertations

The Hydnoraceae are a clade of root holoparasitic angiosperms that contain two small genera, Hydnora and Prosopanche. This study, focused on Hydnora, presents novel data regarding the pollination biology, germination ecology, parasite-host nutritional relationships, and the molecular systematics of this group. Experimental addition of the primary pollinator, Dermestes maculatus to Hydnora africana chamber flowers demonstrated beetle imprisonment during the carpellate stage. Changes in the inner surfaces of the androecial chamber allowed beetle escape after pollen release. Most beetles escaped, dusted with viable pollen, three days after pollen release. To investigate germination ecology, aqueous root extracts of host and …

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Ecology Of Neotropical Arboreal Snakes And Behavior Of New World Mollusk-Eating Snakes, Julie M. Ray Jan 2009

Ecology Of Neotropical Arboreal Snakes And Behavior Of New World Mollusk-Eating Snakes, Julie M. Ray

Biological Sciences Theses & Dissertations

The Neotropics is a biologically diverse region that provides man opportunities for ecological and behavioral studies. I utilized the speciose ophidian fauna of central Panama to explore the general ecology of arboreal snakes, the defensive behaviors of the snake community, and the diet of mollusk-eating snakes. I studied arboreal species to understand interspecilic relationships in several morphometric characters and to examine preferences in habitat. There were significant morphometric differences in relative length of jaw, mass, tail length, and size at midbody. The arboreal realm was partitioned among species by distance to ground, distance to water, and diameter of the perch. …

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Analysis Of N-Linked Oligosaccharides Of Prostate-Specific Antigen And Prostatic Acid Phosphatase In Prostatic Fluids, Krista Yaudes White Jan 2009

Analysis Of N-Linked Oligosaccharides Of Prostate-Specific Antigen And Prostatic Acid Phosphatase In Prostatic Fluids, Krista Yaudes White

Theses and Dissertations in Biomedical Sciences

Presently, prostate cancer is the most common cancer afflicting men in the United States, with serum PSA being the "gold standard" protein biomarker used in the clinic for detecting and diagnosing prostate cancer. Nonetheless, serum PSA levels can also be elevated in non-cancerous conditions as well, such as benign prostatic hyperplasia (BPH). Due to this overlap, many unnecessary biopsies and radical prostatectomies occur, leading to patient distress. Despite recent advances to clinical assays which consider other clinical parameters, there is still a great need for improved clinical detection methodologies for prostate cancer, including improved biomarkers. Therefore, this research project aims …

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Computational Studies On R67 Dihydrofolate Reductase: An Investigation Into Its Unique Binding Patterns, Chuanyin Shi Jan 2009

Computational Studies On R67 Dihydrofolate Reductase: An Investigation Into Its Unique Binding Patterns, Chuanyin Shi

Theses and Dissertations in Biomedical Sciences

R67 dihydrofolate reductase (R67 DHFR) is a plasmid encoded enzyme which catalyzes the reduction of dihydrofolate (DHF) to tetrahydrofolate (THF) using NADPH as a cofactor. R67 DHFR is a homo-tetramer and D2 symmetric. It contains only one active site, which spans the central channel of the enzyme. The active site can bind either two reactants (DHF), two cofactors (NADPH) or one of each (NADPH/DHF), which is the productive ternary complex (i.e. the complex which yields product). In order to favor formation of the productive complex, this enzyme exhibits binding cooperativity. Unlike other allosteric enzymes which achieve binding cooperativity through conformational …

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Transitions And Tipping Points In Complex Environmental Systems, Nsf Advisory Committee For Environmental Research And Education Jan 2009

Transitions And Tipping Points In Complex Environmental Systems, Nsf Advisory Committee For Environmental Research And Education

Long Term Ecological Research Network

No abstract provided.

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Advances And Applications Of Dezert-Smarandache Theory (Dsmt) For Information Fusion (Collected Works), Vol. 3, Florentin Smarandache, Jean Dezert Jan 2009

Advances And Applications Of Dezert-Smarandache Theory (Dsmt) For Information Fusion (Collected Works), Vol. 3, Florentin Smarandache, Jean Dezert

Branch Mathematics and Statistics Faculty and Staff Publications

This volume has about 760 pages, split into 25 chapters, from 41 contributors. First part of this book presents advances of Dezert-Smarandache Theory (DSmT) which is becoming one of the most comprehensive and flexible fusion theory based on belief functions. It can work in all fusion spaces: power set, hyper-power set, and super-power set, and has various fusion and conditioning rules that can be applied depending on each application. Some new generalized rules are introduced in this volume with codes for implementing some of them. For the qualitative fusion, the DSm Field and Linear Algebra of Refined Labels (FLARL) is …

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The Effects Of Varying Seeding Rates Of Bouteloua Curtipendula And Mowing On Native Plant Establishment In A New Prairie Reconstruction, Ryan Leon Welch Jan 2009

The Effects Of Varying Seeding Rates Of Bouteloua Curtipendula And Mowing On Native Plant Establishment In A New Prairie Reconstruction, Ryan Leon Welch

Dissertations and Theses @ UNI

A major problem early in prairie reconstruction is weed competition. Research has shown that mowing in the first year can increase establishment and survival of prairie plants. The use of nurse crops (companion crops) has been suggested as an alternative to mowing for weed suppression. The goal of this study was to examine various seeding rates of B. curtipendula, as a nurse crop in mowed and unmowed plots to determine if it suppressed weeds and aided in the establishment of natives. We hypothesized that increasing the seeding rate of B curtipendula will reduce weed growth and promote an increase in …

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Potential For Range Expansion Of The Invasive Green Mussel, Perna Viridis, In The Southeastern United States, Alyson Goodwin Urian Jan 2009

Potential For Range Expansion Of The Invasive Green Mussel, Perna Viridis, In The Southeastern United States, Alyson Goodwin Urian

UNF Graduate Theses and Dissertations

Cold temperatures are thought to be among the most important determining factors of geographic distribution for tropical and sub-tropical marine invertebrates. The Asian green mussel, Perna viridis, has been introduced into coastal waters of Florida where its current distribution is hypothesized to be limited by low temperatures during winter. Lethal and sublethal effects (heat shock protein/ Hsp70 expression) of cold water and air temperatures were analyzed in two size classes of P. viridis from Florida in an effort to determine the effects of current and forecasted temperatures on the potential for range expansion. Mussels were exposed to water temperatures …

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The Effect Of Zinc On L-Leucine Transport In Lobster Intestine, Anna Lynn Mullins Jan 2009

The Effect Of Zinc On L-Leucine Transport In Lobster Intestine, Anna Lynn Mullins

UNF Graduate Theses and Dissertations

The current study is a characterization of L-leucine absorption across the American lobster intestine in order to determine the likelihood of a bis-complex formation with zinc ([Leu]-Zn-[Leu]) as a possible substrate for PEPT1. This study required isolated lobster intestines to be mounted in a perfusion chamber in order to quantify 3H-L-leucine transport. It was hypothesized that an apical dipeptide transporter, PEPT1, was responsible for uptake of L-leucine via formation of a bis-complex with zinc ([Leu]-Zn-[Leu]) in the form of molecular mimicry, where the bis-complex mimics the normal dipeptide substrate of the proposed carrier system. It was found that L-leucine transport …

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Vegetation Response To Restoration Treatments In A Former Pine Plantation In North Florida, Ryan C. Meyer Jan 2009

Vegetation Response To Restoration Treatments In A Former Pine Plantation In North Florida, Ryan C. Meyer

UNF Graduate Theses and Dissertations

As the human population in Florida continues to expand, development follows, and tree farms give way to homes and businesses. As parks are established, restoration of these semi-natural plantations may provide critical habitat for species conservation. This study evaluates vegetation response to restoration treatments at two study sites, formerly tree farms, now preserves in NE Florida. Treatments included thinning, clearing, or control (no treatment) within 10m^2 plots. Thinning reduced tree canopy to 20% (2-3 pines/plot) and removed all other vegetation; clearing treatments removed all biomass to bare soil; no herbicides were used. Within these plots richness and abundance was assessed …

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Quantifying The Onset Of The Concentric Phase Of The Force–Time Record During Jumping, S.K. Leissring, William Ebben, Luke Garceau, Erich Petushek, R.L. Jensen Jan 2009

Quantifying The Onset Of The Concentric Phase Of The Force–Time Record During Jumping, S.K. Leissring, William Ebben, Luke Garceau, Erich Petushek, R.L. Jensen

Exercise Science Faculty Research and Publications

Thirteen college students performed a drop jump from height equal to their peak vertical jump, single leg jumps from the left and right legs, and a counter movement jump. Vertical ground reaction force (GRF) obtained via an AMTI force plate and video analysis of markers placed on the hip, knee, lateral malleolus, and fifth metatarsal were used to estimate reaction forces on the knee joint. One-way Repeated Measures ANOVA indicated no differences for knee joint reaction forces relative to body weight or peak GRF for any of the jumps (p > 0.05). Average measures Intraclass Correlation Coefficients ranged from r = …

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A Phylogeographic Analysis Of Fiddler Crabs, Uca Longisignalis And U. Pugnax, Cydney Brooks Jan 2009

A Phylogeographic Analysis Of Fiddler Crabs, Uca Longisignalis And U. Pugnax, Cydney Brooks

Dissertations and Theses @ UNI

Uca pugnax and U. longisignalis are fiddler crabs commonly found in the southeastern United States. These sibling species occupy distinct regions. Uca pugnax is found on the Atlantic and U. longisignalis on the Gulf coasts. Their distributions are separated by the Florida peninsula. Many different taxa with similar distributions in this region have been the focus of phylogeographic studies. In these studies, it appears there is no simple pattern to explain genetic variability. Previous studies of Uca pugnax and U. longisignalis reveal no significant morphological or physiological differences within either species across its respective region. The purpose of this study …

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Resistance To And Virulence Of Fusarium Verticillioides, Tracy Lynn Bruns Jan 2009

Resistance To And Virulence Of Fusarium Verticillioides, Tracy Lynn Bruns

Dissertations and Theses @ UNI

The filamentous fungus Fusarium verticillioides is plant pathogen that is responsible for billions of dollars in crop loss world wide. Fusarium verticillioides is of concern as it causes serious infections in maize and other agronomically important crop plants worldwide. Toxins produced by this fungus make grains from infected crops unusable. Plant resistance (or lack thereof) to disease is and has been for centuries a problem in agricultural productivity. Recent advances in the understanding of plant disease resistance promises to allow us to discover ways to counter the invasive properties of Fusarium verticillioides. Currently, very little is known about the virulence …

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Oxidative Stress, Calcium Homeostasis, And Altered Gene Expression In Human Lung Epithelial Cells Exposed To Zno Nanoparticles, Chuan-Chin Huang Jan 2009

Oxidative Stress, Calcium Homeostasis, And Altered Gene Expression In Human Lung Epithelial Cells Exposed To Zno Nanoparticles, Chuan-Chin Huang

Masters Theses

"The influence of 20 nm ZnO nanoparticles on oxidative stress, intracellular calcium homeostasis, and gene expression was studied in human bronchial epithelial cells (BEAS-2B). ZnO caused a concentration- and time-dependent cytotoxicity while elevating oxidative stress and causing membrane damage (cellular LDH release). There was a remarkably steep relationship between concentration and toxicity at concentrations from 5 to 10 μg/ml. Exposure to ZnO increased intracellular calcium levels in a concentration- and time-dependent manner. Treatment with the antioxidant N-acetylcysteine prevented cell loss and diminished the increase in intracellular calcium concentration, suggesting oxidative stress mediated cytotoxicity. Exposure to a sublethal concentration of ZnO …

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Limits To Maize Productivity In The Western Corn-Belt: A Simulation Analysis For Fully Irrigated And Rainfed Conditions, Patricio Grassini, Haishun Yang, Kenneth G. Cassman Jan 2009

Limits To Maize Productivity In The Western Corn-Belt: A Simulation Analysis For Fully Irrigated And Rainfed Conditions, Patricio Grassini, Haishun Yang, Kenneth G. Cassman

Department of Agronomy and Horticulture: Faculty Publications

Unlike the Central and Eastern U.S. Corn-Belt where maize is grown almost entirely under rainfed conditions, maize in the Western Corn-Belt is produced under both irrigated (3.2 million ha) and rainfed (4.1 million ha) conditions. Simulation modeling, regression, and boundary-function analysis were used to assess constraints to maize productivity in the Western Corn-Belt. Aboveground biomass, grain yield, and water balance were simulated for fully irrigated and rainfed crops, using 20-year weather records from 18 locations in combination with actual soil, planting date, plant population, and hybrid-maturity data. Mean values of meteorological variables were estimated for three growth periods (pre- and …

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A Nonsense Mutation In A Cinnamyl Alcohol Dehydrogenase Gene Is Responsible For The Sorghum Brown Midrib6 Phenotype1[W][Oa], Scott E. Sattler, Aaron J. Saathoff, Eric J. Haas, Nathan A. Palmer, Deanna L. Funnell, Gautam Sarath, Jeffrey F. Pedersen Jan 2009

A Nonsense Mutation In A Cinnamyl Alcohol Dehydrogenase Gene Is Responsible For The Sorghum Brown Midrib6 Phenotype1[W][Oa], Scott E. Sattler, Aaron J. Saathoff, Eric J. Haas, Nathan A. Palmer, Deanna L. Funnell, Gautam Sarath, Jeffrey F. Pedersen

Department of Agronomy and Horticulture: Faculty Publications

Recently, bmr6 plants were shown to have limited cinnamyl alcohol dehydrogenase activity (CAD; EC 1.1.1.195), the enzyme that catalyzes the conversion of hydroxycinnamoyl aldehydes (monolignals) to monolignols. A candidate gene approach was taken to identify Bmr6. Two CAD genes (Sb02g024190 and Sb04g005950) were identified in the sorghum genome based on similarity to known CAD genes and through DNA sequencing a nonsense mutation was discovered in Sb04g005950 that results in a truncated protein lacking the NADPH-binding and C-terminal catalytic domains. Immunoblotting confirmed that the Bmr6 protein was absent in protein extracts from bmr6 plants. Phylogenetic analysis indicated that Bmr6 is …

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High-Yielding Corn Response To Applied Phosphorus, Potassium, And Sulfur In Nebraska, Charles S. Wortmann, Achim R. Dobermann, Richard B. Ferguson, Gary W. Hergert, Charles A. Shapiro, D. D. Tarkalson, Daniel T. Walters Jan 2009

High-Yielding Corn Response To Applied Phosphorus, Potassium, And Sulfur In Nebraska, Charles S. Wortmann, Achim R. Dobermann, Richard B. Ferguson, Gary W. Hergert, Charles A. Shapiro, D. D. Tarkalson, Daniel T. Walters

Department of Agronomy and Horticulture: Faculty Publications

Nutrient management recommendations may change as yield levels and efficiency of crop production increase. Recommendations for P, K, and S were evaluated using results from 34 irrigated corn (Zea mays L.) trials conducted in diverse situations across Nebraska. The mean yield was 14.7 Mg ha-1 with adequate fertilizer applied. Th e median harvest index values were 0.52, 0.89, 0.15, and 0.56 for biomass, P, K, and S, respectively. Median grain yields were 372, 49, and 613 kg kg-1 of above-ground plant uptake of P, K, and S, respectively. The estimated critical Bray-1 P level for corn response …

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Farming Systems Education: Case Study Of Swedish Test Pilots, Lennart Salomonsson, Anna Nilsson, Sofia Palmer, Adam Roigart, Charles A. Francis Jan 2009

Farming Systems Education: Case Study Of Swedish Test Pilots, Lennart Salomonsson, Anna Nilsson, Sofia Palmer, Adam Roigart, Charles A. Francis

Department of Agronomy and Horticulture: Faculty Publications

We describe and analyze a pedagogical experiment that introduced a broad and holistic perspective on complete farming systems, systemic learning tools, and a participatory learning strategy at an early stage in agronomy education. The paper describes the adventure of three students, who came from a conventional agronomy program at the Swedish University of Agricultural Sciences (SLU), who were frustrated with the lack of integrated approaches to the study of agricultural systems and a strong focus on molecular-level processes in their first year of education. They encountered a narrow focus in most courses and the overall curricula of agricultural education that …

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Alternative Methods For Wetland Restoration In The Rainwater Basin, Nebraska, Usa, Nancy Nicolai, James L. Stubbendieck Jan 2009

Alternative Methods For Wetland Restoration In The Rainwater Basin, Nebraska, Usa, Nancy Nicolai, James L. Stubbendieck

Department of Agronomy and Horticulture: Faculty Publications

South-central Nebraska is recognized as a focal point of the mid-continent migratory waterfowl flyway. Substantial wetland alterations led to a critical need for restoration. Managers have restored wetlands by scraping with heavy earthmoving equipment to remove excess organic material and near-monocultures of reed canarygrass (Phalaris arundinacea L.) but managers report high costs and topsoil perturbation. Moderate livestock grazing was tested to compare results with those achieved with mechanical techniques. Advantages of grazing could include low costs and less soil perturbation. During the 2006 and 2007 growing seasons, we compared cover of bare ground and open water and plant species …

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Research Emphasis – Forage And Bioenergy Crop Management, John A. Guretzky Jan 2009

Research Emphasis – Forage And Bioenergy Crop Management, John A. Guretzky

Department of Agronomy and Horticulture: Faculty Publications

Guretzky specializes in research on forage and bioenergy crop management that will assist agricultural producers and landowners in meeting their goals. The first area of research involves Drs. Jon Biermacher and Billy Cook for the evaluation of management practices of switchgrass in forage and bioenergy systems. Objectives include: 1.) assessing potential on-farm biomass yields and production economics of switchgrass; 2.) documenting effects of location, harvest system and nitrogen fertilizer rates on biomass yields, forage quality, stand persistence and nutrient removal rates; 3.) evaluating establishment and biomass production responses to phosphorus and potassium fertilization; 4.) determining how stocker cattle gains on …

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Blue Fescue Overseeding Improves Performance Of Fairway Height Buffalograsses, Bekele G. Abeyo, Robert C. Shearman, Roch E. Gaussoin, Leonard A. Wit, Desalegn D. Serba, Ugur Bilgili Jan 2009

Blue Fescue Overseeding Improves Performance Of Fairway Height Buffalograsses, Bekele G. Abeyo, Robert C. Shearman, Roch E. Gaussoin, Leonard A. Wit, Desalegn D. Serba, Ugur Bilgili

Department of Agronomy and Horticulture: Faculty Publications

Buffalograss [Buchloe dactyloides (Nutt.) Engelm.] use as a fairway turfgrass is limited in northern portions of its adaptation zone by its extended winter dormancy and tan coloration in early spring and late fall. Cool-season grasses mixed with buffalograss could enhance turfgrass appearance and performance in fall and early spring. Research was conducted near Mead, NE, with eight buffalograss genotypes maintained under fairway conditions to determine the effect of blue fescue (Festuca ovina L. var. glauca Lam.) overseeding rate on turfgrass performance. Interactions were nonsignificant in most cases so main effects are emphasized. Differences were observed between seeding rates and …

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Gibberellic Acid Promotes Seed Germination In Penstemon Digitalis Cv. Husker Red, Anderson Machado De Mello, Nereu Augusto Streck, Erin E. Blankenship, Ellen Paparozzi Jan 2009

Gibberellic Acid Promotes Seed Germination In Penstemon Digitalis Cv. Husker Red, Anderson Machado De Mello, Nereu Augusto Streck, Erin E. Blankenship, Ellen Paparozzi

Department of Agronomy and Horticulture: Faculty Publications

Penstemon seed often shows an inconsistent or a low germination percentage. Although most select cultivars are propagated by cuttings, for export to other countries, seed is preferred. Three experiments were conducted to determine if soaking seed in gibberellic acid (GA3) would increase seed germination of Penstemon digitalis cv. Husker Red. GA3 concentrations used were 0, 10, 50, 100, 200, and 500 mg∙L–1 (first experiment); 0, 500, 1000, and 1500 mg∙L–1 (second experiment); and 0, 500, and 1000 mg∙L–1 (third experiment). The first and second experiments were conducted in a growth chamber, whereas the third …

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