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Articles 1 - 30 of 29463

Full-Text Articles in Life Sciences

Growth, Lipid Production And Biodiesel Potential Of Chromulina Freiburgensis Dofl., An Acidophilic Chrysophyte Isolated From Berkeley Pit Lake, June E. Mohler Mitman Mar 2109

Growth, Lipid Production And Biodiesel Potential Of Chromulina Freiburgensis Dofl., An Acidophilic Chrysophyte Isolated From Berkeley Pit Lake, June E. Mohler Mitman

Graduate Theses & Non-Theses

Microalgae remain a promising, but underdeveloped source of lipids for sustainable biodiesel. Some of the obstacles to cost-effective commercial-scale production have been culture contamination and expensive harvest methods. A chrysophyte isolated from Berkeley Pit Lake and identified as Chromulina freiburgensis, was found to grow rapidly in a pH 2.5 liquid medium and to amass numerous intracellular lipid bodies. This research addresses the scarcity of published knowledge on the topic of chrysophyte species as potential lipid sources for biodiesel. It investigates how growth phase, culture conditions, and harvest timing influence the quantity and composition of lipids produced by this alga ...


Corn And Soybean Response To Wastewater-Recycled Phosphorus Fertilizers, Shane Ylagan Dec 2020

Corn And Soybean Response To Wastewater-Recycled Phosphorus Fertilizers, Shane Ylagan

Crop, Soil and Environmental Sciences Undergraduate Honors Theses

The ability to recycle phosphorus (P) from wastewaters could provide a sustainable, continuous source of P that might also help protect surface water quality from P enrichment. The mineral struvite (MgNH4PO4·6H2O) is an understudied material that can be created from Pcontaining wastewater and has been shown to have agricultural fertilizer value. The objective of this study was to evaluate the effects of electrochemically precipitated struvite (ECST), chemically precipitated struvite (Crystal Green; CG), diammonium phosphate (DAP), monoammonium phosphate (MAP), rock phosphate (RP), and triple super phosphate (TSP) on corn (Zea mays) and soybean (Glycine max) response in a 79-day greenhouse ...


Comparing Uganda's Indigenous Soil Classification System With World Reference Base And Usda Soil Taxonomy To Predict Soil Productivity, Stewart Kyebogola, C. Lee Burras, Bradley A. Miller, Onesimus Semalulu, Russell S. Yost, Moses M. Tenywa, Andrew W. Lenssen, Prossy Kyomuhendo, Christopher Smith, Charles K. Luswata, Mwanjalolo J. Gilbert Majaliwa, Lance Goettsch, Carol J. Pierce Colfer, Robert E. Mazur Sep 2020

Comparing Uganda's Indigenous Soil Classification System With World Reference Base And Usda Soil Taxonomy To Predict Soil Productivity, Stewart Kyebogola, C. Lee Burras, Bradley A. Miller, Onesimus Semalulu, Russell S. Yost, Moses M. Tenywa, Andrew W. Lenssen, Prossy Kyomuhendo, Christopher Smith, Charles K. Luswata, Mwanjalolo J. Gilbert Majaliwa, Lance Goettsch, Carol J. Pierce Colfer, Robert E. Mazur

Agronomy Publications

This study examines three soil classification systems - Buganda, World Reference Base, and US Soil Taxonomy - in order to evaluate their relative strengths and feasibility for making linkages between them. Nine field sites and 16 pedons were considered across the soil landscapes of the Buganda catena. Each identified field pedon diagnostic horizons and characteristics were described and their soils analyzed using standard pedological techniques and measurements. To document the indigenous use of the Buganda classification system, interviews and discussions were held with farmer groups and local extension specialists. Using this local expertise, five local soil units were identified. We also identified ...


Paleoenvironmental Reconstruction Of Quaternary Saltville, Virginia, Using Ostracode Autecology, Austin Gause Aug 2020

Paleoenvironmental Reconstruction Of Quaternary Saltville, Virginia, Using Ostracode Autecology, Austin Gause

Electronic Theses and Dissertations

The Saltville valley in southwestern Virginia is home to Quaternary localities containing paleontological and archaeological remains. Historically the valley has been mined for salt and the small lakes, ponds and springs along the valley floor have a brackish signature. A preliminary report on the site’s ostracode fauna suggested that the site’s water was not always saline. This study analyzed modern and Quaternary ostracodes to understand the valley’s hydrologic and chemical evolution. Sediments contained primarily freshwater species, including the environmentally sensitive Candona crogmaniana. The presence of Pelocypris tuberculatum and a new Fabaeformiscandona species throughout a vertical section spanning ...


Proton Pumping Mechanism In Cytochrome C Oxidase, Xiuhong Cai Jun 2020

Proton Pumping Mechanism In Cytochrome C Oxidase, Xiuhong Cai

All Dissertations, Theses, and Capstone Projects

Cytochrome c Oxidase (CcO), is the terminal electron acceptor in the membrane bound aerobic respiratory chain. It reduces O2 to water. The energy released by this reaction is stored by pumping protons from the high pH, N-side of the membrane to the low pH, P-side. The generated proton gradient provides the motive force for synthesis of ATP by the ATP synthase.

Building a proton gradient across the membrane requires that proton transport must occur along controllable proton pathways to prevent proton leakage to the N-side. It has been suggested that CcO function requires proton transfer channels in both the ...


Experimental Increases In Diversity And Evenness Improve Productivity And Reduce Weed Invasion In Grassland Swards Over Three Years Across 12 European Sites, Laura Kirwan, Caroline Brophy, R. P. Collins, J. Connolly, J. A. Finn, A. Helgadottir, A. Lüscher, C. Porqueddu, M. T. Sebastià May 2020

Experimental Increases In Diversity And Evenness Improve Productivity And Reduce Weed Invasion In Grassland Swards Over Three Years Across 12 European Sites, Laura Kirwan, Caroline Brophy, R. P. Collins, J. Connolly, J. A. Finn, A. Helgadottir, A. Lüscher, C. Porqueddu, M. T. Sebastià

International Grassland Congress Proceedings

No abstract provided.


Fire And Vegetation Change In Coastal Grasslands, South Africa, Kevin P. Kirkman, B. P. A. Dalton May 2020

Fire And Vegetation Change In Coastal Grasslands, South Africa, Kevin P. Kirkman, B. P. A. Dalton

International Grassland Congress Proceedings

No abstract provided.


Studies On The Autecology Of Astragalus Caragana F. Et M In The Esfahan Province In Ira, M. Khodagholi, M. Esmaili Sharif, A. Ghaedi, M. Borhand, M. T. Feyze May 2020

Studies On The Autecology Of Astragalus Caragana F. Et M In The Esfahan Province In Ira, M. Khodagholi, M. Esmaili Sharif, A. Ghaedi, M. Borhand, M. T. Feyze

International Grassland Congress Proceedings

No abstract provided.


The Acacia Operation Project: A Pilot Activity For Combating Desertification And Improving The Livelihood Of Pastoralist In The Arid Rangelands Of Kenya, G. A. Keya, M. Muga, B. Chikamai May 2020

The Acacia Operation Project: A Pilot Activity For Combating Desertification And Improving The Livelihood Of Pastoralist In The Arid Rangelands Of Kenya, G. A. Keya, M. Muga, B. Chikamai

International Grassland Congress Proceedings

No abstract provided.


Impacts Of Grazing, Wildfire And Drought On Rodent Populations In A Semi-Arid Grassland Of Southwestern North America, L. J. Kennedy, Z. F. Jones, C. E. Bock, J. H. Bock May 2020

Impacts Of Grazing, Wildfire And Drought On Rodent Populations In A Semi-Arid Grassland Of Southwestern North America, L. J. Kennedy, Z. F. Jones, C. E. Bock, J. H. Bock

International Grassland Congress Proceedings

No abstract provided.


Stability, Recovery, And Resilience In Piosphere Systems In The Kruger National Park, Katherine J. Matchett, Kevin P. Kirkman, Craig D. Morris, Mike J. Peel May 2020

Stability, Recovery, And Resilience In Piosphere Systems In The Kruger National Park, Katherine J. Matchett, Kevin P. Kirkman, Craig D. Morris, Mike J. Peel

International Grassland Congress Proceedings

No abstract provided.


Contribution Of Lucerne And Red Clover To Succeeding Cereal Crops Yield, Žydrė Kadžiulienė, Zenonas Dabkevičius, Lina Šarūnaitė, Leonas Kadžiulis May 2020

Contribution Of Lucerne And Red Clover To Succeeding Cereal Crops Yield, Žydrė Kadžiulienė, Zenonas Dabkevičius, Lina Šarūnaitė, Leonas Kadžiulis

International Grassland Congress Proceedings

No abstract provided.


The Effect Of Environmental Factors On Plant Species Diversity And Productivity, K. H. Li, Y. K. Hu, C. F. Lu, W. M. E. Wu, W. L. Li May 2020

The Effect Of Environmental Factors On Plant Species Diversity And Productivity, K. H. Li, Y. K. Hu, C. F. Lu, W. M. E. Wu, W. L. Li

International Grassland Congress Proceedings

No abstract provided.


Temporal And Spatial Variation Of Arbuscular Mycorrhizal Fungi Spores In Seasonally Salt Stressed Grassland Using Medicago Sativa For Reclamation In Hexi Corridor, China, Liang Jin, Chang Wang, Guoliang Chen, Yin Zhao, Xiangwei Sun, Xiaojuan Wang May 2020

Temporal And Spatial Variation Of Arbuscular Mycorrhizal Fungi Spores In Seasonally Salt Stressed Grassland Using Medicago Sativa For Reclamation In Hexi Corridor, China, Liang Jin, Chang Wang, Guoliang Chen, Yin Zhao, Xiangwei Sun, Xiaojuan Wang

International Grassland Congress Proceedings

No abstract provided.


Effect Of Long‐Term Salt Stress On Antioxidative Enzyme Activities Of Nypa Forage (Distichlis Spicata Var. Yensen‐4a) And Tall Fescue (Festuca Arundinacea Schreb), Yaxiong Jia, Xianglin Li, Liqiang Wan, Feng He May 2020

Effect Of Long‐Term Salt Stress On Antioxidative Enzyme Activities Of Nypa Forage (Distichlis Spicata Var. Yensen‐4a) And Tall Fescue (Festuca Arundinacea Schreb), Yaxiong Jia, Xianglin Li, Liqiang Wan, Feng He

International Grassland Congress Proceedings

No abstract provided.


Effects Of Various Cattle Grazing Regimes On Vernal Pool Grassland Diversity, J. T. Marty May 2020

Effects Of Various Cattle Grazing Regimes On Vernal Pool Grassland Diversity, J. T. Marty

International Grassland Congress Proceedings

No abstract provided.


Impacts Of Long-Term Phosphorus Fertilization And Addition Of Perennial Legumes On A Temperate Natural Grassland: I. Changes In Spieces Biodiversity And Stability, Martín Jaurena, Walter Ayala, José Terra, Raül Bermudez, Ethel Barrios, Ximena Lagomarsino May 2020

Impacts Of Long-Term Phosphorus Fertilization And Addition Of Perennial Legumes On A Temperate Natural Grassland: I. Changes In Spieces Biodiversity And Stability, Martín Jaurena, Walter Ayala, José Terra, Raül Bermudez, Ethel Barrios, Ximena Lagomarsino

International Grassland Congress Proceedings

No abstract provided.


Influence Of Growing Season Rainfall Amount And Clipping Intensity On Aboveground Net Primary Productivity In Leyums Chinensis Steppe, Feng He, Xianglin Li, Liqiang Wan, Yaxiong Jia, Dan He May 2020

Influence Of Growing Season Rainfall Amount And Clipping Intensity On Aboveground Net Primary Productivity In Leyums Chinensis Steppe, Feng He, Xianglin Li, Liqiang Wan, Yaxiong Jia, Dan He

International Grassland Congress Proceedings

No abstract provided.


The Effect Of Aspect On Persistence Of Several Perennial Grass Species, Belinda Hackney, B. Dear, C. Rodham, G. Dyce, G. Li May 2020

The Effect Of Aspect On Persistence Of Several Perennial Grass Species, Belinda Hackney, B. Dear, C. Rodham, G. Dyce, G. Li

International Grassland Congress Proceedings

No abstract provided.


Botanical Composition: A Tool To Evaluate Rangeland Condition Trends Under Different Management Conditions, María Cristina Goldfarb, José Francisco Casco, Laura Itatí Giménez, Francisco Nuñez May 2020

Botanical Composition: A Tool To Evaluate Rangeland Condition Trends Under Different Management Conditions, María Cristina Goldfarb, José Francisco Casco, Laura Itatí Giménez, Francisco Nuñez

International Grassland Congress Proceedings

No abstract provided.


Morphological Changes Associated With Forage Quality In Temperate Pastures Fertilized With Nitrogen In Autumn, M. L. Gatti, A. Ayala Torales, G. Acosta May 2020

Morphological Changes Associated With Forage Quality In Temperate Pastures Fertilized With Nitrogen In Autumn, M. L. Gatti, A. Ayala Torales, G. Acosta

International Grassland Congress Proceedings

No abstract provided.


Is There A Link Between Anthropogenic Disturbance And The Diversity And Abundance Of Rodent Flea Communities?, Megan M. Friggens May 2020

Is There A Link Between Anthropogenic Disturbance And The Diversity And Abundance Of Rodent Flea Communities?, Megan M. Friggens

International Grassland Congress Proceedings

No abstract provided.


When An Introduced Pasture Grass Becomes A Conservation Threat: Managing Buffel Grass In The Rangelands Of Australia, Margaret H. Friedel May 2020

When An Introduced Pasture Grass Becomes A Conservation Threat: Managing Buffel Grass In The Rangelands Of Australia, Margaret H. Friedel

International Grassland Congress Proceedings

No abstract provided.


Effects Of 10 Years Of Fire And Climate Variability On Perennial Grass Cover In Shortgrass Steppe, P. L. Ford May 2020

Effects Of 10 Years Of Fire And Climate Variability On Perennial Grass Cover In Shortgrass Steppe, P. L. Ford

International Grassland Congress Proceedings

No abstract provided.


Unravelling The Mechanisms Behind The Invasion Of An Introduced And Now Undesirable Grass Species, Jennifer Firn, Yvonne Buckley May 2020

Unravelling The Mechanisms Behind The Invasion Of An Introduced And Now Undesirable Grass Species, Jennifer Firn, Yvonne Buckley

International Grassland Congress Proceedings

No abstract provided.


Botanical Composition Of A Phalaris-Dominant Pasture 5 Years After The Introduction Of Intensive Rotational Grazing, Nicholas J. Edwards, K. Copping, K. Holberton, P. Wijnands May 2020

Botanical Composition Of A Phalaris-Dominant Pasture 5 Years After The Introduction Of Intensive Rotational Grazing, Nicholas J. Edwards, K. Copping, K. Holberton, P. Wijnands

International Grassland Congress Proceedings

No abstract provided.


Aps March Meeting 2020: Undergraduate-Friendly Research In Soft Matter And Beyond, Vianney Gimenez-Pinto May 2020

Aps March Meeting 2020: Undergraduate-Friendly Research In Soft Matter And Beyond, Vianney Gimenez-Pinto

Title III Professional Development Reports

The in-person APS March Meeting 2020 taking place in Denver during March 02-06, 2020 was canceled in the last minute out of Covid-19 concerns for the well-being of the scientific community as well as the population of the city of Denver and the state of Colorado. Nevertheless, well-planned logistics by the physics community and the APS leadership, allowed attendants to share their findings, presenting their research works to their peers, and continuing the work towards the advancement of science. Given the historical and on-going under-representation of students of color in science and technology at all academic levels, there is a ...


Modeling The Growth Of Alfalfa (Medicago Sativa) In The Pampas Region, M. Druille, M. F. Garbulsky, V. A. Deregibus May 2020

Modeling The Growth Of Alfalfa (Medicago Sativa) In The Pampas Region, M. Druille, M. F. Garbulsky, V. A. Deregibus

International Grassland Congress Proceedings

No abstract provided.


Central Afghanistan Rangelands, Daniel G. Robinett May 2020

Central Afghanistan Rangelands, Daniel G. Robinett

International Grassland Congress Proceedings

No abstract provided.


Controls Of Seeding Recruitment Of Annual Species In Temperate Perennial Pastures, P. Cornaglia, M. P. Clavijo, H. Harkes, Ayala Torales May 2020

Controls Of Seeding Recruitment Of Annual Species In Temperate Perennial Pastures, P. Cornaglia, M. P. Clavijo, H. Harkes, Ayala Torales

International Grassland Congress Proceedings

No abstract provided.