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Articles 721 - 750 of 4790
Full-Text Articles in Life Sciences
Acer Negundo L., Paul B. Marcum, Loy R. Phillippe
Acer Negundo L., Paul B. Marcum, Loy R. Phillippe
Specimens by Name
No abstract provided.
Morus Alba L., Paul B. Marcum, Loy R. Phillippe
Morus Alba L., Paul B. Marcum, Loy R. Phillippe
Specimens by Name
No abstract provided.
Claytonia Virginica L., Paul B. Marcum, Loy R. Phillippe
Claytonia Virginica L., Paul B. Marcum, Loy R. Phillippe
Specimens by Name
No abstract provided.
Viola Sororia Willd., Paul B. Marcum, Loy R. Phillippe
Viola Sororia Willd., Paul B. Marcum, Loy R. Phillippe
Specimens by Name
No abstract provided.
Grevillea Robusta A. Cunningham Ex R. Br., J. Richard Abbott
Grevillea Robusta A. Cunningham Ex R. Br., J. Richard Abbott
Specimens by Name
No abstract provided.
Tetrastigma Voinieranum (Baltet) Pierre Ex Gagnep., Richard J. Abott
Tetrastigma Voinieranum (Baltet) Pierre Ex Gagnep., Richard J. Abott
Specimens by Name
No abstract provided.
Viola Sororia Willd., Paul B. Marcum
Forestiera Segregata (Jacq.) Krug & Urb., J. Richard Abbott, Kurt Neubig, Julie Neubig
Forestiera Segregata (Jacq.) Krug & Urb., J. Richard Abbott, Kurt Neubig, Julie Neubig
Specimens by Name
No abstract provided.
Cissus Trifoliata (L.) L., Richard J. Abott, Kurt Neubig
Cissus Trifoliata (L.) L., Richard J. Abott, Kurt Neubig
Specimens by Name
No abstract provided.
Respiratory Effects Of 1-Propylxanthine On Neonatal Rats, Amanda Hance
Respiratory Effects Of 1-Propylxanthine On Neonatal Rats, Amanda Hance
Student Honors Theses
Neonatal apnea is commonly treated by methylxanthines like caffeine or theophylline, but these drugs have the potential to create serious side effects. As an alternative, a new xanthine analog, 1-propylxanthine (1-PX), was recently synthesized at Eastern Illinois University. The respiratory effects of 1-PX were investigated in 4- to 7-day-old rats to determine if 1-PX could be a respiratory stimulant. Each rat was placed in a heated body plethysmograph, and its respiratory rate and volume were measured using a flow transducer, pneumotachograph, and Power Lab data acquisition system. After a 10-min control period, the rat was given a s.c. dose of …
Edge Influence On Reproductive Success Of Symphoricarpos Orbiculatus, Breanne M. Nott
Edge Influence On Reproductive Success Of Symphoricarpos Orbiculatus, Breanne M. Nott
Student Honors Theses
With continued forest fragmentation, edge effects play an important role in shaping the structure and composition of plant communities. Some forest plant species exhibit increased abundance at forest edges, while other species have a negative edge response. Despite welldocumented edge effects, there are few studies that document the underlying effects on population dynamics of individual species that result in edge responses. Two mechanisms may generate differential distribution of a species across an edge. Edges may 1) alter population demographics by influencing the plant’s uptake and allocation of resources, or may 2) influence the spatial pattern of seed dispersal. Coral berry …
Sideroxylon Inerme L., J. Richard Abbott
Mimusops Caffra E.Mey. Ex A.Dc., J. Richard Abbott
Mimusops Caffra E.Mey. Ex A.Dc., J. Richard Abbott
Specimens by Name
No abstract provided.
Ficus Perforata L., Richard J. Abbott
Sideroxylon Celastrinum (Kunth) T.D. Penn., J. Richard Abbott
Sideroxylon Celastrinum (Kunth) T.D. Penn., J. Richard Abbott
Specimens by Name
No abstract provided.
Phoradendron Leucarpum (Raf.) Reveal & M.C. Johnston, Richard J. Abbott
Phoradendron Leucarpum (Raf.) Reveal & M.C. Johnston, Richard J. Abbott
Specimens by Name
No abstract provided.
Jasminum Fluminense Vell., J. Richard Abbott
Sideroxylon Foetidissimum Jacq., J. Richard Abbott
Sideroxylon Foetidissimum Jacq., J. Richard Abbott
Specimens by Name
No abstract provided.
Hybanthus Prunifolius (Humb. & Bonpl. Ex Schult.) Schulze-Menz, Richard J. Abbott
Hybanthus Prunifolius (Humb. & Bonpl. Ex Schult.) Schulze-Menz, Richard J. Abbott
Specimens by Name
No abstract provided.
Environmental Conditions Affect Sperm Competition Risk In Japanese Beetles (Coleoptera: Scarabaeidae), Paul Switzer, Carissa Schoenick, Patrick Enstrom
Environmental Conditions Affect Sperm Competition Risk In Japanese Beetles (Coleoptera: Scarabaeidae), Paul Switzer, Carissa Schoenick, Patrick Enstrom
Faculty Research & Creative Activity
Males of many species guard their mates to prevent rivals from usurping paternity of the potential offspring. Environmental conditions, such as temperature, may affect a male’s ability to guard a female effectively and consequently the amount of sperm competition that occurs. We tested whether temperature and light affected mating behavior in laboratory experiments on the Japanese beetle, Popillia japonica Newman, a species in which males guard females for minutes to many hours after mating. When tested in groups, under conditions of high temperature and high light, males guarded females for shorter periods of time and males and females both mated …
Raccoon (Procyon Lotor) Harvesting On And Near The U.S. Department Of Energy’S Savannah River Site, Karen F. Gaines, James M. Novak
Raccoon (Procyon Lotor) Harvesting On And Near The U.S. Department Of Energy’S Savannah River Site, Karen F. Gaines, James M. Novak
Faculty Research & Creative Activity
Understanding the toxicodynamics of wildlife populations in contaminated ecosystems is one of the greatest challenges in ecotoxicology today. The goal is to manage these populations to minimize risk to ecosystem integrity as well as human health. Ecological risk assessments (ERAs) in the United States are designed to meet the regulatory mandates of the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) and the Resource Conservation and Recovery Act. According to the U.S. Environmental Protection Agency, an ERA evaluates the potential adverse effects that human activities have on the ' ora and fauna that de( ne an ecosystem (U.S. Environmental Protection …
Old Acetogens, New Light, Steven L. Daniel, Harold L. Drake, Anita S. Gößner
Old Acetogens, New Light, Steven L. Daniel, Harold L. Drake, Anita S. Gößner
Faculty Research & Creative Activity
Acetogens utilize the acetyl-CoA Wood-Ljungdahl pathway as a terminal electron-accepting, energy-conserving, CO2-fixing process. The decades of research to resolve the enzymology of this pathway (1) preceded studies demonstrating that acetogens not only harbor a novel CO2-fixing pathway, but are also ecologically important, and (2) overshadowed the novel microbiological discoveries of acetogens and acetogenesis. The first acetogen to be isolated, Clostridium aceticum, was reported by Klaas Tammo Wieringa in 1936, but was subsequently lost. The second acetogen to be isolated, Clostridium thermoaceticum, was isolated by Francis Ephraim Fontaine and co-workers in 1942. C. thermoaceticum became the most extensively studied acetogen and …
Spatial And Temporal Expression Profiling Of Cell-Wall Invertase Genes During Early Development In Hybrid Poplar, Thomas Canam, Sarah W.Y. Mak, Shawn D. Mansfield
Spatial And Temporal Expression Profiling Of Cell-Wall Invertase Genes During Early Development In Hybrid Poplar, Thomas Canam, Sarah W.Y. Mak, Shawn D. Mansfield
Faculty Research & Creative Activity
Cell-wall invertase genes are spatially and temporally regulated in several plant species, including Daucus carota L., Lycopersicon esculentum L. and Solanum tuberosum L. However, few studies of cell-wall invertase genes of trees have been conducted, despite the importance of trees as a source of lignocellulosic biopolymers.We identified three putative cell-wall invertase genes in hybrid poplar (Populus alba L. × grandidentata Michx.) that showed higher homology to each other than to cell-wall invertases of other dicotyledonous species, with two of the genes (Pa×gINV2 and Pa×gINV3) appearing as a genomic tandem repeat. These genes are more similar to each other than to …
Phylogenetic Utility Of Ycf1 In Orchids: A Plastid Gene More Variable Than Matk, Kurt M. Neubig, W. Mark Whitten, Barbara S. Carlsward, Mario A. Blanco, Lorena Endara, Norris H. Williams, Michael Moore
Phylogenetic Utility Of Ycf1 In Orchids: A Plastid Gene More Variable Than Matk, Kurt M. Neubig, W. Mark Whitten, Barbara S. Carlsward, Mario A. Blanco, Lorena Endara, Norris H. Williams, Michael Moore
Faculty Research & Creative Activity
Plastid DNA sequences have been widely used by systematists for reconstructing plant phylogenies. The utility of any DNA region for phylogenetic analysis is determined by ease of amplification and sequencing, confidence of assessment in phylogenetic character alignment, and by variability across broad taxon sampling. Often, a compromise must be made between using relatively highly conserved coding regions or highly variable introns and intergenic spacers. Analyses of a combination of these types of DNA regions yield phylogenetic structure at various levels of a tree (i.e., along the spine and at the tips of the branches). Here, we demonstrate the phylogenetic utility …
Scale-Dependent Habitat Use By Fall Migratory Birds: Vegetation Architecture, Floristics, And Geographic Consistency, Jill Deppe, John Rotenberry
Scale-Dependent Habitat Use By Fall Migratory Birds: Vegetation Architecture, Floristics, And Geographic Consistency, Jill Deppe, John Rotenberry
Faculty Research & Creative Activity
Animal habitat selection is a central focus of ecology and conservation biology. Understanding habitat associations in migratory animals is particularly complicated because individuals have variable habitat requirements during the annual cycle, across their geographic range, along migratory routes, and at multiple spatial scales. We studied habitat associations of 16 fall Nearctic–Neotropical migratory land birds at two spatial scales at a stopover site along the northern Yucatan coast to examine scale-dependent habitat use, identify proximate cues shaping birds' distributions, and evaluate similarities in habitat use between our tropical stopover site and temperate sites. We addressed scale-dependent habitat associations in two ways, …
Molybdate Treatment And Sulfate Starvation Decrease Atp And Dna Levels In Ferroplasma Acidarmanus, Kai Hung
Molybdate Treatment And Sulfate Starvation Decrease Atp And Dna Levels In Ferroplasma Acidarmanus, Kai Hung
Faculty Research & Creative Activity
Sulfate is a primary source of sulfur for most microbes and in some prokaryotes it is used an electron acceptor. The acidophile Ferroplasma acidarmanus (strain fer1) requires a minimum of 150 mM of a sulfate-containing salt for growth. Sulfate is assimilated by F. acidarmanus into proteins and reduced to form the volatile organic sulfur compounds methanethiol and dimethyldisulfide. In the absence of sulfate, cell death occurs by an unknown mechanism. In this study, cell viability and genomic DNA and ATP contents of F. acidarmanus were monitored in response to the absence of sulfate or the presence of sulfate and the …
Molybdate Treatment And Sulfate Starvation Decrease Atp And Dna Levels In Ferroplasma Acidarmanus, Kai F. Hung
Molybdate Treatment And Sulfate Starvation Decrease Atp And Dna Levels In Ferroplasma Acidarmanus, Kai F. Hung
Faculty Research & Creative Activity
Sulfate is a primary source of sulfur for most microbes and in some prokaryotes it is used an electron acceptor. The acidophile Ferroplasma acidarmanus (strain fer1) requires a minimum of 150 mM of a sulfate-containing salt for growth. Sulfate is assimilated by F. acidarmanus into proteins and reduced to form the volatile organic sulfur compounds methanethiol and dimethyldisulfide. In the absence of sulfate, cell death occurs by an unknown mechanism. In this study, cell viability and genomic DNA and ATP contents of F. acidarmanus were monitored in response to the absence of sulfate or the presence of sulfate and the …
Simulating The Effects Of Wetland Loss And Inter-Annual Variability On The Fitness Of Migratory Bird Species, Jill L. Deppe, James A. Smith
Simulating The Effects Of Wetland Loss And Inter-Annual Variability On The Fitness Of Migratory Bird Species, Jill L. Deppe, James A. Smith
Faculty Research & Creative Activity
Long-distance migratory shorebirds require wetland stopover sites where they can forage and deposit sufficient fat to complete their migration and, in the spring, reproduce. Conservation biologists are concerned that continental-scale reductions in wetland availability and quality due to human disturbance, climate change, and natural drought events are negatively impacting these species by eliminating critical stopovers along migratory flyways. We describe an individual-based migration model driven by remotely sensed land surface data, climate data assimilation models, and biological field data to examine the impact of changing environmental conditions on migration routes, temporal patterns, and fitness. We used an evolutionary programming approach …
Vegetative Anatomy Of Calypsoeae (Orchidaceae), William Louis Stern, Barbara S. Carlsward
Vegetative Anatomy Of Calypsoeae (Orchidaceae), William Louis Stern, Barbara S. Carlsward
Faculty Research & Creative Activity
Calypsoeae represent a small tribe of anatomically little-known orchids with a wide distribution in the Western Hemisphere. Leaves are present in all genera, except Corallorhiza and Wullschlaegelia both of which are subterranean taxa. Stomata are abaxial (ad- and abaxial in Aplectrum) and tetracytic (anomocytic in Calypso). Fiber bundles are absent in leaves of all taxa examined except Govenia tingens. Stegmata are present in leaves of only Cremastra and Govenia. Roots are velamentous, except in filiform roots of Wullschlaegelia. Vegetative anatomy supports a relationship between Wullschlaegelia and Corallorhiza but does not support the grouping of winter-leaved Aplectrum and Tipularia nor proposed …
Phylogenetic Utility Of Ycf1 In Orchids: A Plastid Gene More Variable Than Matk, Kurt Neubig, W. Whitten, Barbara Carlsward, Mario Blanco, Lorena Endara, Norris Williams, Michael Moore
Phylogenetic Utility Of Ycf1 In Orchids: A Plastid Gene More Variable Than Matk, Kurt Neubig, W. Whitten, Barbara Carlsward, Mario Blanco, Lorena Endara, Norris Williams, Michael Moore
Faculty Research & Creative Activity
Plastid DNA sequences have been widely used by systematists for reconstructing plant phylogenies. The utility of any DNA region for phylogenetic analysis is determined by ease of amplification and sequencing, confidence of assessment in phylogenetic character alignment, and by variability across broad taxon sampling. Often, a compromise must be made between using relatively highly conserved coding regions or highly variable introns and intergenic spacers. Analyses of a combination of these types of DNA regions yield phylogenetic structure at various levels of a tree (i.e., along the spine and at the tips of the branches). Here, we demonstrate the phylogenetic utility …