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Articles 32371 - 32400 of 39348
Full-Text Articles in Entire DC Network
Physiological Performance Of Thamnophis Hammondii Is Not Affected After Eating The Toxic Frog Xenopus Laevis, C. Drew Foster
Physiological Performance Of Thamnophis Hammondii Is Not Affected After Eating The Toxic Frog Xenopus Laevis, C. Drew Foster
Masters Theses
No abstract provided.
Factors Affecting The Mate Guarding Behavior In Japanese Beetles (Popillia Japonica Newman), Yoriko Saeki
Factors Affecting The Mate Guarding Behavior In Japanese Beetles (Popillia Japonica Newman), Yoriko Saeki
Masters Theses
No abstract provided.
Impacts Of Agricultural Landscapes On The Breeding Biology And Behavioral Ecology Of Grassland Birds, Susan Allison Linn
Impacts Of Agricultural Landscapes On The Breeding Biology And Behavioral Ecology Of Grassland Birds, Susan Allison Linn
Masters Theses
No abstract provided.
Eastern Box Turtle (Terrapene C. Carolina) As A Dispersal Vector Of Seeds And Spores, William J. Jordan
Eastern Box Turtle (Terrapene C. Carolina) As A Dispersal Vector Of Seeds And Spores, William J. Jordan
Masters Theses
No abstract provided.
Mendel's Legacy: The Origin Of Classical Genetics, Michael Dietrich
Mendel's Legacy: The Origin Of Classical Genetics, Michael Dietrich
Dartmouth Scholarship
Review of Mendel's Legacy: The Origin of Classical Genetics by Elof Axel Carlson, 2004
Chemical Defenses In Garlic Mustard (Alliaria Petiolata) And Their Potential Role In Species Interactions In Forest Understories, Don Cipollini
Chemical Defenses In Garlic Mustard (Alliaria Petiolata) And Their Potential Role In Species Interactions In Forest Understories, Don Cipollini
Biological Sciences Faculty Publications
Garlic mustard [Alliaria petiolata [(M. Bieb) Cavara & Grande; Brassicaceae] is a European native biennial herb, first recorded on Long Island, NY in the 1860s, and is expanding rapidly in northeastern and midwestern forests in the U.S. and in southern Canada. Garlic mustard flourishes in moist woodlands with moderate exposure to light, but it can grow in a diversity of other habitats. It is found in natural areas, woodlots, and along edges of agricultural fields and lawns throughout North America. Several life history traits likely contribute to the invasiveness of this species. It has a high inbreeding rate and can …
Red Light Regulation Of Ethylene Biosynthesis And Gravitropism In Etiolated Pea Stems, C. L. Steed, L. K. Taylor, Marcia Harrison-Pitaniello Phd
Red Light Regulation Of Ethylene Biosynthesis And Gravitropism In Etiolated Pea Stems, C. L. Steed, L. K. Taylor, Marcia Harrison-Pitaniello Phd
Biological Sciences Faculty Research
During gravitropism, the accumulation of auxin in the lower side of the stem causes increased growth and the subsequent curvature, while the gaseous hormone ethylene plays a modulating role in regulating the kinetics of growth asymmetries. Light also contributes to the control of gravitropic curvature, potentially through its interaction with ethylene biosynthesis. In this study, red-light pulse treatment of etiolated pea epicotyls was evaluated for its effect on ethylene biosynthesis during gravitropic curvature. Ethylene biosynthesis analysis included measurements of ethylene; the ethylene precursor 1-aminocyclopropane-1-carboxylic acid (ACC); malonyl-conjugated ACC (MACC); and expression levels of pea ACC oxidase (Ps-ACO1) and …
Survey Of Salamanders In Mississippi Limestone Caves, John G. Himes, David C. Beckett, Austin W. Trousdale
Survey Of Salamanders In Mississippi Limestone Caves, John G. Himes, David C. Beckett, Austin W. Trousdale
Faculty Publications
During 2000-2002 we surveyed for salamanders in the larger limestone caves of Mississippi, all within the Vicksburg Group rock unit. We found four species: Plethodon mississippi was the most abundant, followed by Eurycea guttolineata, Eurycea cirrigera, and Desmognathus conanti. We did not find Pseudotriton montanus in any of the caves, and question the validity of an investigator's statement made nearly 45 years ago that, "it is one of the most numerous salamanders in Mississippi. limestone caves." The salamander fauna we found is similar to that of the only other comprehensive survey of salamanders in Mississippi caves, conducted almost thirty years …
Ndp Kinase Moves Into Developing Primary Cilia, Kimberly A. P. Mitchell, Betty C. Gallagher, Gabor Szabo, Angela De S. Otero
Ndp Kinase Moves Into Developing Primary Cilia, Kimberly A. P. Mitchell, Betty C. Gallagher, Gabor Szabo, Angela De S. Otero
Faculty Publications and Presentations
Inmunofluorescence staining of murine NIH3T3 fibroblasts grown at high density shows that conventional nucleoside diphosphate (NDP) kinases A and B localize to a sensory organelle, the primary cilium. Similar results are obtained with Xenopus A6 kidney epithelial cells, suggesting that NDP kinases are a universal component of the primary cilium. The translocation of NDP kinase into primary cilia depends on size, taking place only when cilia reach a critical length of 5-6 μm. In mature cilia, NDP kinases are distributed along the ciliary shaft in a punctate pattern that is distinct from the continuous staining observed with acetylated α-tubulin, a …
Summer 2004, Nova Southeastern University
The Status Of Leptodactylus Validus As A Single Taxon And Its Relationship To Letptodactylus Pallidirostris, Kenneth Christopher Yanek
The Status Of Leptodactylus Validus As A Single Taxon And Its Relationship To Letptodactylus Pallidirostris, Kenneth Christopher Yanek
Master's Theses
Leptodactylus validus exhibits an unusual distribution inhabiting Trinidad, Tobago, and the Lesser Antilles, but not the mainland of South America. This distribution is inconsistent with other distribution patterns observed for these islands. Although slight variation in adult morphology has been observed among the island populations, call data suggest the presence of a single species. Calls of Leptodactylus pallidirostris from Venezuela suggested that this taxon might be conspecific with L. validus. Herein sequence data from the 12S and 16S mt rRNA genes were collected and analyzed in order to address: 1.) whether more than one species is represented within L. validus, …
Least Shrew (Cryptotis Parva ) In Extreme West-Central Nebraska, Keith Geluso, Jeremy A. White, Michael A. Bogen
Least Shrew (Cryptotis Parva ) In Extreme West-Central Nebraska, Keith Geluso, Jeremy A. White, Michael A. Bogen
Biology Faculty Publications
During the past 35 years, the least shrew (Cryptotis parva) has expanded its distribution along riverine and other mesic corridors in western parts of its distribution, although some recently discovered populations in the West might represent relicts of a previous Pleistocene distribution. In Nebraska, the least shrew originally was known only from eastern and central parts of the state, but recent records are now available from extreme west-central Nebraska and the northwestern corner of the state. Our record from west-central Nebraska probably represents recent westward expansion of C. parua along the North Platte River. This capture in Scotts …
Dynamics Of Rodent Assemblages Inhabiting Abandoned Petroleum Landfarms In Oklahoma, James Wilson, R. L. Lochmiller, D. M. Janz
Dynamics Of Rodent Assemblages Inhabiting Abandoned Petroleum Landfarms In Oklahoma, James Wilson, R. L. Lochmiller, D. M. Janz
Biology Faculty Publications
Studies on the effects of anthropogenic contamination on wildlife have largely been focused at the individual level. Biomarkers have been used to monitor changes in the health of individuals exposed to contaminants; however, little attention has been given to the effects of chronic exposure at the population or community levels. We studied rodent assemblages from uncontaminated (reference) sites (n 5 5) and abandoned petrochemical landfarms (n 5 5) in Oklahoma to investigate potential alterations in community structure and composition. Rodent assemblages inhabiting landfarms had lower species diversity, lower richness, and a more even distribution of individuals across species. Reference sites …
Characterization Of Ammonia Oxidizing Bacteria In An Activated Sludge Plant Using A Fluorescent In Situ Hybridization Method, Gülnur Coşkuner
Characterization Of Ammonia Oxidizing Bacteria In An Activated Sludge Plant Using A Fluorescent In Situ Hybridization Method, Gülnur Coşkuner
Turkish Journal of Biology
The spatial arrangement of functionally important ammonia oxidizing bacteria (AOB) in activated sludge flocs is largely unknown and activated sludge flocs are regarded as heterogeneous agglomerations of bacterial communities. This study aimed to determine both the location of AOB microcolonies within flocs and the size variation of these microcolonies based on their location. Fluorescent in situ hybridization (FISH) was used in combination with a confocal scanning laser microscope (CSLM) to achieve these goals. Grab samples taken from a full-scale plug flow wastewater treatment plant were examined with probes targeted to AOB b-Proteobacteria (Nso1225) and a genus specific probe targeted to …
Production Of Pullulan From Beet Molasses And Synthetic Medium By Aureobasidium Pullulans, Yekta Göksungur, Asli Uçan, Ulgar Güvenç
Production Of Pullulan From Beet Molasses And Synthetic Medium By Aureobasidium Pullulans, Yekta Göksungur, Asli Uçan, Ulgar Güvenç
Turkish Journal of Biology
The production of pullulan from molasses and synthetic medium by Aureobasidium pullulans P56 in batch culture was investigated. Among the pretreatments of molasses used to increase polysaccharide production, sulfuric acid + activated carbon treatment gave better results with regard to polysaccharide concentration, polysaccharide yield and sugar utilization. A maximum polysaccharide concentration of 21.4 g l^{-1} and a pullulan concentration of 16.7 g l^{-1} were obtained in synthetic medium whereas 35.0 g l^{-1} of polysaccharide and 16.9 g l^{-1} of pullulan were obtained in molasses medium containing 50 g l^{-1} of initial sugar at pH 7.5. The highest pullulan contents of …
Cellular Functions Of The 26s Proteasome, Azmi̇ Yerli̇kaya
Cellular Functions Of The 26s Proteasome, Azmi̇ Yerli̇kaya
Turkish Journal of Biology
The 26S proteasome plays a critical role in many cellular processes by degrading a wide range of both short-lived and long-lived proteins. In this review, proteasome structure and the mechanisms of substrates targeting to the 26S proteasome are described. In addition, this review focuses on the cellular functions that are affected after inhibition of the proteasome, including immune-response, cell-cycle, and transcription. The proteasome is involved in these cellular processes because it degrades numerous short-lived proteins and regulatory proteins that control these cellular functions. Even though it is known that inhibition of the 26S proteasome results in the induction of the …
An Electrophoretic Study On Esterase And Blood Serum Proteins Of The Water Vole, Arvicola Terrestris (L., 1758) (Mammalia: Rodentia), In Kırşehir Province, Ceren İyi̇gün, Reyhan Çolak
An Electrophoretic Study On Esterase And Blood Serum Proteins Of The Water Vole, Arvicola Terrestris (L., 1758) (Mammalia: Rodentia), In Kırşehir Province, Ceren İyi̇gün, Reyhan Çolak
Turkish Journal of Biology
Esterase enzymes from 30 specimens of Arvicola terrestris in 4 localities in Kırşehir province were examined using starch gel electrophoresis and blood serum proteins from 27 specimens using SDS-PAGE. It was determined that the esterase enzyme had 2 alleles (A and B), which were coded by 1 locus. A and B allele frequencies were 0.362 and 0.638, respectively. The heterozygosity level was 0.5. It was determined that there were variations in the globulin, prealbumin and postalbumin regions, while the albumin region was monomorphic. There were 6-13 bands in the globulin region, 1-2 bands in the postalbumin zone and 2-4 bands …
Variability In Broods Of The Seastar Leptasterias Aequalis, William B. Jaeckle, Brian L. Bingham, Kehualani Giles
Variability In Broods Of The Seastar Leptasterias Aequalis, William B. Jaeckle, Brian L. Bingham, Kehualani Giles
Scholarship
Enormous variation exists in the reproductive output of marine invertebrates (e.g., in the numbers of em¬bryos produced, the volumes of embryos, and the energy that they contain). It is not clear why there is such great variability or what the population-level consequences are. We sampled a population of the brooding seastar Leptasterias aequalis (Stimpson, 1862) to collect basic information on brood sizes, embryo volume, and embryo energy content with a goal to better understand the reproductive ecology of this species. We collected brooding females in February and again in April. We measured the size of their broods and sampled the …
Evaluation Of Toxicity Of Tannery Effluent On Plankton Community Structure: A Multispecies Microcosm Study Ii, Yalavarthi Naga Koteswari, Ravichandran Ramanibai
Evaluation Of Toxicity Of Tannery Effluent On Plankton Community Structure: A Multispecies Microcosm Study Ii, Yalavarthi Naga Koteswari, Ravichandran Ramanibai
Turkish Journal of Biology
Laboratory experiments were conducted to evaluate the dose-dependent response of tannery effluents on plankton community structure using polyurethane foam (PF) as artificial substrate. Naturally derived planktonic communities on PF provided colonists for the development of new communities under stress conditions in the laboratory. Predictions of colonization rate, taxonomic richness and relative abundance in a series of microcosms dosed with a gradient of tannery effluent from 20% to 35% concentration were assessed after the initial dosage study (1% to 15%). Changes in taxonomic composition occur at high levels of stress. End points responding at increasing levels of stress are declines in …
The Mechanism Of Inhibition Of Human Erythrocyte Catalase By Azide, Yasemi̇n Aksoy, Mevhi̇be Balk, Hamdi̇ Öğüş, Nazmi̇ Özer
The Mechanism Of Inhibition Of Human Erythrocyte Catalase By Azide, Yasemi̇n Aksoy, Mevhi̇be Balk, Hamdi̇ Öğüş, Nazmi̇ Özer
Turkish Journal of Biology
In order to elucidate the kinetic mechanism of human erythrocyte catalase a well-known substrate, H_2O_2 and inhibitor azide were used. The catalase-mediated conversion of H_2O_2 to H_2O and O_2, in the presence and absence of azide, was studied in 50 mM phosphate buffer pH 7.0 at 37 ºC under conditions where the peroxidation side reaction (RH_2 + H_2O_2 R + 2H_2O) is negligible ([H_2O_2] =< 25 mM; assay time, 10 s). The kinetics conformed to the Michaelis-Menten model. Lineweaver-Burk plots for H_2O_2 at different fixed concentrations of azide were linear and intersected on the abscissa indicating a noncompetitive or irreversible type of inhibition. To identify the inhibition type Vm vs. [E] plots were constructed at different [N_3-]. The plots were linear and converged at the origin, indicating that N_3- is a noncompetitive inhibitor. Using a non-linear curve-fitting program, the kinetic parameters were calculated. The K_m value for H_2O_2, and the K_i value for azide were found to be 10.97 ± 1.46 mM and 1.107 ± 0.093 µM, respectively.
A Morphological Study Of The Venom Apparatus Of The Spider Allopecosa Fabilis (Araneae, Lycosidae), Külti̇ği̇n Çavuşoğlu, Meltem Maraş, Abdullah Bayram
A Morphological Study Of The Venom Apparatus Of The Spider Allopecosa Fabilis (Araneae, Lycosidae), Külti̇ği̇n Çavuşoğlu, Meltem Maraş, Abdullah Bayram
Turkish Journal of Biology
The morphological structure of the venom apparatus of Allopecosa fabrilis was studied using scanning electron microscopy (SEM). The venom apparatus is situated in the prosoma and is composed of a pair of chelicerae and venom glands. Each chelicera consists of 2 parts, a stout basal part covered by hair, and a movable fang. A venom pore is situated on the subterminal part of the fang. Just below the fang, there is a cheliceral groove next to the teeth. Each side of the groove is covered with cuticular teeth. The venom glands are large and roughly cylindrical. Each gland is surrounded …
Influence Of Arbuscular Mycorrhiza On Some Physiological Growth Parameters Of Pepper, Semra Demi̇r
Influence Of Arbuscular Mycorrhiza On Some Physiological Growth Parameters Of Pepper, Semra Demi̇r
Turkish Journal of Biology
Arbuscular Mycorrhiza (AM) is a symbiotic association between plant roots and certain soil fungi. Mycorrhiza establishment is known to modify several aspects of plant physiology such as mineral nutrient composition, hormonal balance, and C allocation patterns. In this study, the effect of the Arbuscular Mycorrhizal fungus Glomus intraradices Schenck & Smith on the physiological growth parameters of pepper (Capsicum annuum L. cv Cetinel-150) plants was investigated. To explain the physiological growth of these plants, some physiological growth parameters were determined in the shoots and leaves of mycorrhizal (M) and nonmycorrhizal (NM) plants such as the P and dry matter (d.m.) …
Antibacterial Activities Of Some Plant Extracts Utilized In Popular Medicine In Palestine, Bassam Abu-Shanab, Ghaleb Mohammad Adwan, Dahood Abu-Safiya, Naser Jarrar, Kamel Adwan
Antibacterial Activities Of Some Plant Extracts Utilized In Popular Medicine In Palestine, Bassam Abu-Shanab, Ghaleb Mohammad Adwan, Dahood Abu-Safiya, Naser Jarrar, Kamel Adwan
Turkish Journal of Biology
The antibacterial activities of hot water, methanol and ethanol extracts of 5 plant extracts utilized in Palestine in popular medicine were studied. The dried extracts of Syzyium aromaticum (Myrtaceae) (seed), Cinnamomum cassia (Lauraceae) (cassia bark, Chinese cinnamon) (bark), Salvia officinalis (Lamiaceaea) (leaf), Thymus vulgaris (Lamiaceaea) (leaf) and Rosmarinus officinalis (Labiatae) (leaf) were tested in vitro against 4 bacterial species by disk diffusion and micro-dilution. The patterns of inhibition varied with the plant extract, the solvent used for extraction, and the organism tested. Methicillin-resistant Staphylococcus aureus (MRSA) and Bacillus subtilis ATCC 6633 were the most inhibited microorganisms. S. aromaticum extract was …
Species Composition And Diversity Of Epipelic Algae In Çatal Lake (Şebinkarahisar-Giresun, Turkey), Bülent Şahi̇n
Species Composition And Diversity Of Epipelic Algae In Çatal Lake (Şebinkarahisar-Giresun, Turkey), Bülent Şahi̇n
Turkish Journal of Biology
The epipelic algae of Çatal Lake were studied between June and October 2002. Fifty-three taxa (39 belonging to Bacillariophyta, 8 to Chlorophyta, 5 to Cyanophyta and 1 to Euglenophyta) were determined. Based on the epipelic algal composition, Çatal Lake can be characterized as eutrophic.
The Use Of Ram Horn Hydrolysate As A Supplement For Glycerol Production By Yeast, Esabi̇ Başaran Kurbanoğlu, Namudar İzzet Kurbanoğlu
The Use Of Ram Horn Hydrolysate As A Supplement For Glycerol Production By Yeast, Esabi̇ Başaran Kurbanoğlu, Namudar İzzet Kurbanoğlu
Turkish Journal of Biology
This study describes the interesting potential of ram horns to be used as a supplement for glycerol production in batch fermentation. The use of ram horn hydrolysate (RHH) as a supplement for glycerol production was investigated using baker’s yeast, Saccharomyces cerevisiae. For this purpose, RHH was first produced. The production and chemical composition of the RHH was as described in our previous study. The effects of different concentrations (1 to 10% v/v) of RHH on the production of glycerol were investigated, and 8% RHH was found to be optimal. The content of glycerol in the culture broth containing RHH (6.3 …
Encounters Between Dynamic Cortical Microtubules Promote Ordering Of The Cortical Array Through Angle-Dependent Modifications Of Microtubule Behavior, Ram Dixit, Richard Cyr
Encounters Between Dynamic Cortical Microtubules Promote Ordering Of The Cortical Array Through Angle-Dependent Modifications Of Microtubule Behavior, Ram Dixit, Richard Cyr
Biology Faculty Research
Ordered cortical microtubule arrays are essential for normal plant morphogenesis, but how these arrays form is unclear. The dynamics of individual cortical microtubules are stochastic and cannot fully account for the observed order; however, using tobacco (Nicotiana tabacum) cells expressing either the MBD-DsRed (microtubule binding domain of the mammalian MAP4 fused to the Discosoma sp red fluorescent protein) or YFP-TUA6 (yellow fluorescent protein fused to the Arabidopsis alpha-tubulin 6 isoform) microtubule markers, we identified intermicrotubule interactions that modify their stochastic behaviors. The intermicrotubule interactions occur when the growing plus-ends of cortical microtubules encounter previously existing cortical microtubules. Importantly, the outcome …
The Cortical Microtubule Array: From Dynamics To Organization, Ram Dixit, Richard Cyr
The Cortical Microtubule Array: From Dynamics To Organization, Ram Dixit, Richard Cyr
Biology Faculty Research
Cortical microtubules (CMTs) are essential for normal plant morphogenesis because they affect the axes of cell elongation and predict the placement of cell division planes. The function of the CMTs is intimately linked to their organizational state, which is subject to spatial and temporal modifications by developmental and environmental cues. CMT assembly dynamics govern when, where, and how microtubules appear in a cell's cortex, and the regulation of these properties affects their organization. However, the principles that link microtubule assembly dynamics to cortical array organization and reconfiguration are not well understood. This essay focuses on recent advances in the understanding …
The Effect Of Sex On Ischemia - Reperfusion Induced Arrhythmias And The Role Of Atp - Dependent Potassium Channel Blockage, Ersöz Gonca, Eylem Suveren Ti̇ryaki̇, Ömer Bozdoğan
The Effect Of Sex On Ischemia - Reperfusion Induced Arrhythmias And The Role Of Atp - Dependent Potassium Channel Blockage, Ersöz Gonca, Eylem Suveren Ti̇ryaki̇, Ömer Bozdoğan
Turkish Journal of Biology
The presence of more ATP-dependent potassium channels in females has been thought to play an important role in protection against myocardial ischemia. In this study, we investigated whether there is a difference in the severity of ischemia and reperfusion induced arrhythmias due to sex and, if there is, what the role of ATP-dependent potassium channel in this difference is. The left anterior descending coronary artery in rats was ligated and arrhythmias were recorded in ECG during 6 min. of ischemia and reperfusion. The duration of arrhythmias was shorter in females than in corresponding males. Glibenclamide was effective in decreasing the …
Sediment-Magnetic Signature Of Land-Use And Drought As Recorded In Lake Sediment From South-Central Minnesota, U.S.A., Christoph E. Geiss, Subir K. Banerjee, Philip Camill, Charles E. Umbanhowar
Sediment-Magnetic Signature Of Land-Use And Drought As Recorded In Lake Sediment From South-Central Minnesota, U.S.A., Christoph E. Geiss, Subir K. Banerjee, Philip Camill, Charles E. Umbanhowar
Biology Faculty Work
Sediment magnetic properties of a short core from Sharkey Lake, MN, record the effects of Euroamerican settlement and climate change over the last 150 yr. The onset of European-style farming led to increased erosion, reflected in high values of concentration-dependent parameters such as magnetic susceptibility (j), Isothermal Remanent Magnetization (IRM), and Anhysteretic Remanent Magnetization (ARM). These high values are only partially due to increased supply of terrigenous material to the lake, and recent sediment contains an additional component of authigenic fine (single-domain) magnetite, most likely magnetosomes from magnetotactic bacteria. High organic productivity in the lake during the 1920s to 1940s …
Permafrost Thaw Accelerates In Boreal Peatlands During Late-20th Century Climate Warming, Philip Camil
Permafrost Thaw Accelerates In Boreal Peatlands During Late-20th Century Climate Warming, Philip Camil
Biology Faculty Work
Permafrost covers 25% of the land surface in the northern hemisphere, where mean annual ground temperature is less than 0◦C. A 1.4–5.8 ◦C warming by 2100 will likely change the sign of mean annual air and ground temperatures over much of the zones of sporadic and discontinuous permafrost in the northern hemisphere, causing widespread permafrost thaw. In this study, I examined rates of discontinuous permafrost thaw in the boreal peatlands of northern Manitoba, Canada, using a combination of tree-ring analyses to document thaw rates from 1941–1991 and direct measurements of permanent benchmarks established in 1995 and resurveyed in 2002. I …