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2013

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Articles 1381 - 1410 of 1508

Full-Text Articles in Biology

Computational Design Of A Pentapeptide Inhibitor For Fibroblast Growth Factor Receptor 3b (Fgfr3b), Mehmet Ali̇ Öztürk Jan 2013

Computational Design Of A Pentapeptide Inhibitor For Fibroblast Growth Factor Receptor 3b (Fgfr3b), Mehmet Ali̇ Öztürk

Turkish Journal of Biology

Fibroblast growth factor receptor (FGFR) is a cell membrane protein and a member of the tyrosine kinase family. It has extracellular domains that can be activated by ligand binding, followed by receptor dimerization. FGFR3 has 2 isoforms, 3b and 3c. The R248C mutation in FGFR3b leads to ligand independent receptor dimerization and results in different kinds of dermatological diseases such as seborrheic keratoses, acanthosis nigricans, and epidermal nevi. In order to prevent the increased cellular signaling caused by the R248C mutation, a pentapeptide ligand was designed that recognizes the mutation and binds to the receptor dimerization site. Molecular docking and …

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Establishment And Optimization Of Cell Growth In Suspension Culture Of Papaver Bracteatum: A Biotechnology Approach For Thebaine Production, Reza Farjaminezhad, Nasser Zare, Rasool Asghari Zakaria, Manoochehr Farjaminezhad Jan 2013

Establishment And Optimization Of Cell Growth In Suspension Culture Of Papaver Bracteatum: A Biotechnology Approach For Thebaine Production, Reza Farjaminezhad, Nasser Zare, Rasool Asghari Zakaria, Manoochehr Farjaminezhad

Turkish Journal of Biology

Iranian poppy (Papaver bracteatum) is an important medicinal plant that is the main source of the opium alkaloids codeine, morphine, and thebaine. To establish an efficient protocol for cell suspension culture and growth, the effects of different plant growth regulators (2,4-D, NAA, BAP, and kinetin) on callus induction and cell suspension culture of Iranian poppy were evaluated. The maximum percentage of callus induction (86.67%) and fresh weight of callus were obtained in MS medium supplemented with 1 or 2 mg/L 2,4-D, 0.1 or 0.2 mg/L kinetin and 15 mg/L ascorbic acid. The addition of 15 mg/L ascorbic acid to the …

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Micropropagation And Antimicrobial Activity Of Curcuma Aromatica Salisb., A Threatened Aromatic Medicinal Plant, Shamima Akhtar Sharmin, Mohammad Jahangir Alam, Md. Mominul Islam Sheikh, Rashed Zaman, Muhammad Khalekuzzaman, Sanjoy Chandra Mondal, Mohammad Anwarul Haque, Mohammad Firoz Alam, Iftekhar Alam Jan 2013

Micropropagation And Antimicrobial Activity Of Curcuma Aromatica Salisb., A Threatened Aromatic Medicinal Plant, Shamima Akhtar Sharmin, Mohammad Jahangir Alam, Md. Mominul Islam Sheikh, Rashed Zaman, Muhammad Khalekuzzaman, Sanjoy Chandra Mondal, Mohammad Anwarul Haque, Mohammad Firoz Alam, Iftekhar Alam

Turkish Journal of Biology

A rapid and improved micropropagation protocol was developed for Curcuma aromatica, a threatened aromatic medicinal plant, using rhizome sprout as the explant. Stepwise optimization of different plant growth regulators, carbon sources, and basal media was adopted to establish an efficient micropropagation protocol. When cytokinins, such as benzyl amino purine (BAP) or 6-(\alpha,\alpha-dimethylallylamino)-purine (2iP), were used either singly or in combination with naphthalene acetic acid (NAA) for shoot induction and multiplication, a single use of BAP was the most effective. As a carbon source, 3% (w/v) sucrose exhibits the greatest promotive effect on shoot initiation and proliferation compared with other carbon …

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Cytogenetic Effects Of Endogenous Sex Hormones Depending On Smoking Habits, Handan Erboğa, Hasan Basri̇ İla Jan 2013

Cytogenetic Effects Of Endogenous Sex Hormones Depending On Smoking Habits, Handan Erboğa, Hasan Basri̇ İla

Turkish Journal of Biology

This study was conducted with the aim of determining the effects of periodical hormonal fluctuations related to the menstrual cycle on chromosome sensitivity and cytotoxicity. The study group consisted of 8 healthy donors (4 nonsmokers and 4 smokers). Cytogenetic tests were done in vitro (in test tubes), and the known mutagenic effect of mitomycin C was added to determine chromosome sensitivity. Blood was drawn from the donors at specified time intervals (follicular phase, ovulation phase, and luteal phase), and control groups and mitomycin C-treated groups were formed. In the controls, the highest sister chromatid exchange frequency was detected in the …

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In Vitro Mutagenesis Of Etlingera Elatior (Jack) And Early Detection Of Mutation Using Rapd Markers, Muhamad Fahmi Yunus, Maheran Abd Aziz, Mihdzar Abdul Kadir, Siti Khalijah Daud, Azmi Abdul Rashid Jan 2013

In Vitro Mutagenesis Of Etlingera Elatior (Jack) And Early Detection Of Mutation Using Rapd Markers, Muhamad Fahmi Yunus, Maheran Abd Aziz, Mihdzar Abdul Kadir, Siti Khalijah Daud, Azmi Abdul Rashid

Turkish Journal of Biology

Mutation breeding techniques in combination with tissue culture and molecular marker methods provide a powerful tool for improvement of vegetatively propagated plants. The aim of this study was to develop a protocol for shoot regeneration and mutation induction of Etlingera elatior. The results of irradiation on in vitro buds of E. elatior showed LD_{50} to be 10 Gy, with the survival of explants being sharply reduced at this dosage. All 8 selected gamma irradiated regenerants were differentiated from the untreated control based on the banding patterns obtained using 9 primers, which generated 59 reproducible bands, whereby 35 (55.31%) were found …

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Improving In Vitro Leaf Disk Regeneration System Of Sugarcane (Saccharum Officinarum L.) With Concurrent Shoot/Root Induction From Somatic Embryos, Muhammad Nawaz, Ihsan Ullah, Naeem Iqbal, Muhammad Zaffar Iqbal, Muhammad Aslam Javed Jan 2013

Improving In Vitro Leaf Disk Regeneration System Of Sugarcane (Saccharum Officinarum L.) With Concurrent Shoot/Root Induction From Somatic Embryos, Muhammad Nawaz, Ihsan Ullah, Naeem Iqbal, Muhammad Zaffar Iqbal, Muhammad Aslam Javed

Turkish Journal of Biology

Genome engineering experiments are impeded by poor performance of regeneration systems. The present study was aimed at establishing a short and cost-effective in vitro regeneration system for elite sugarcane cultivars through simultaneous shoot/root induction. The innermost spindle leaf and shoot tip were used as explants. For callus induction, Murashige and Skoog (MS) medium supplemented with 2,4-dichlorophenoxyacetic acid (2,4-D) was used and 5.0 mg/L of 2,4-D supported maximum callus induction (84.5%). Three-week-old calli were treated with different levels of benzylaminopurine (BAP) ranging from 0.00 to 3.5 mg/L in MS medium, where 2.5 mg/L BAP was proven to be the best level …

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The S-Genotyping Of Wild-Grown Apricots Reveals Only Self-Incompatible Accessions In The Erzincan Region Of Turkey, Julia Halasz, Attila Hegedus, Bernadett Szikriszt, Sezai̇ Erci̇şli̇, Emi̇ne Orhan, Hakan Murat Ünlü Jan 2013

The S-Genotyping Of Wild-Grown Apricots Reveals Only Self-Incompatible Accessions In The Erzincan Region Of Turkey, Julia Halasz, Attila Hegedus, Bernadett Szikriszt, Sezai̇ Erci̇şli̇, Emi̇ne Orhan, Hakan Murat Ünlü

Turkish Journal of Biology

The S-genotypes of 63 wild-growing Turkish apricots (Prunus armeniaca L.) were determined by PCR amplification of the S-RNase intron regions and SFB gene in order to characterise their sexual (in)compatibility phenotype. We determined the complete S-genotype of 63 wild-grown apricot accessions that originated in the Erzincan region. Ten previously described and 2 new S-alleles (provisionally labelled S_X and S_Y) were identified in the genotypes. S_2 was the most frequent S-allele in the tested germplasm (occurred in 19 accessions), followed by S_8 (17), S_{19} (16), S_3 (13), S_{12} (11), S_6 (10), and S_7 (10); while S_{9}-, S_{11}-, and S_{13}-alleles were found …

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Evaluation Of Antioxidative Effects Of Twelve 3-Substituted-5,5-Diphenylhydantoins On Human Colon Cancer Cell Line Hct-116, Ana Obradovic, Jovana Zizic, Nemanja Trisovic, Bojan Bozic, Gordana Uscumlic, Biljana Bozic, Snezana Markovic Jan 2013

Evaluation Of Antioxidative Effects Of Twelve 3-Substituted-5,5-Diphenylhydantoins On Human Colon Cancer Cell Line Hct-116, Ana Obradovic, Jovana Zizic, Nemanja Trisovic, Bojan Bozic, Gordana Uscumlic, Biljana Bozic, Snezana Markovic

Turkish Journal of Biology

Antioxidant effects of twelve 3-substituted-5,5-diphenylhydantoins in concentrations of 0.01, 0.1, 1, 10, and 100 µM on human colon cancer cell line HCT-116 were determined 24 h after treatment. The concentrations of superoxide anion radical (O_{2}^{.}^{-}), nitrites (NO_{2}^{-}), and total glutathione were determined spectrophotometrically. Results indicated that treatment with all compounds induced a decrease in O_{2}^{.}^{-} and an increase in NO_{2}^- concentrations in HCT-116 cells. Treatment with all compounds resulted in an increase in glutathione, and this indicates changes in redox homeostasis. Based on the obtained results, the investigated hydantoins act as antioxidants because they decrease the production of superoxide anion …

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Evaluation Of Phytotoxic And Mutagenic Effects Of Some Cinnamic Acid Derivatives Using The Triticum Test, Alexandra Jitareanu, Silvica Padureanu, Gabriela Tataringa, Cristina Tuchilus, Ursula Stanescu Jan 2013

Evaluation Of Phytotoxic And Mutagenic Effects Of Some Cinnamic Acid Derivatives Using The Triticum Test, Alexandra Jitareanu, Silvica Padureanu, Gabriela Tataringa, Cristina Tuchilus, Ursula Stanescu

Turkish Journal of Biology

Five cinnamic acid derivatives [cinnamic acid, 2,3-dibromo-3-phenyl-propanoic acid, 2,3-dibromo-3-(3-bromophenyl)-propanoic acid, 2,3-dibromo-3-(4-hydroxy-3-methoxyphenyl)-propanoic acid, and 2,3-dibromo-3-(3-bromo-4-hydroxy-5-methoxyphenyl)-propanoic acid] were found to be active against Staphylococcus aureus ATCC 25923, and their minimal bactericidal concentrations were determined (100 µg/mL). The first step in assessing their toxicological potential was the phytotoxicity and genotoxicity evaluation on Triticum aestivum. Wheat seeds were exposed to solutions of the tested compounds (100 µg/mL) for 24 and 48 h. The development of roots and seedlings, germination percentage, mitotic index, chromosomal aberrations, and total polyphenol content were analyzed. The substances caused in most experimental cases a slight inhibition in the growth of …

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Flying Speed In Drosophila Melanogaster Selected For Fast Flight, Jess Wheeler Ms Jan 2013

Flying Speed In Drosophila Melanogaster Selected For Fast Flight, Jess Wheeler Ms

All Student Scholarship

The aim of this study was to quantify the increase in flying speed in two replicate lines of Drosophila melanogaster (AA1 and AA2), after approximately 520 generations of selection for fast flight in a wind tunnel.

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Relating Climate Change To The Nesting Phenology And Nest Environment Of Marine Turtles, Monette Schwoerer Jan 2013

Relating Climate Change To The Nesting Phenology And Nest Environment Of Marine Turtles, Monette Schwoerer

Electronic Theses and Dissertations

Ectotherms (including marine turtles) being especially sensitive to climate, are at risk to the accelerated rate of human-driven climate change. This study addresses two concerns associated with marine turtles and climate change – the relationship between the timing of marine turtle nesting and sea surface temperature; and the concern over the feminization of marine turtle populations due to rising sand temperatures. Previous studies of loggerhead sea turtles (Caretta caretta) and green sea turtles (Chelonia mydas) have documented the relationship between sea surface temperatures and nesting phenology. Earlier nesting behaviors in both species have been associated with warmer sea surface temperatures. …

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Juvenile Ornamentation: Its Evolution, Genetic Basis, And Variation Across Habitats, Angela Tringali Jan 2013

Juvenile Ornamentation: Its Evolution, Genetic Basis, And Variation Across Habitats, Angela Tringali

Electronic Theses and Dissertations

Ornamental traits are considered honest advertisements of fitness, and their evolution is usually explained in terms of sexual selection. This explanation remains unsatisfactory in some instances, for example, juvenile birds whose plumage is molted prior to adulthood and breeding. I first evaluate whether juvenile plumage reflectance signals dominance status in the Federally Threatened Florida scrub-jay (Aphelocoma coerulescens) using a combination of observational and experimental methods. Then I estimate the heritability, non-genetic maternal and environmental effects, and strength of selection on juvenile plumage reflectance using archived feather samples and a pedigree constructed from historical nest records. Finally, I compare plumage reflectance …

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Carcass Feeding For Captive Vultures: Testing Assumptions About Zoos And Effects On Birds And Visitors, Hannah Gaengler Jan 2013

Carcass Feeding For Captive Vultures: Testing Assumptions About Zoos And Effects On Birds And Visitors, Hannah Gaengler

Dissertations and Theses

Carcass feeding is a potentially controversial feeding method for zoo animals. The common assumption is that many North American zoos refrain from feeding large carcasses to their carnivorous animals because zoo visitors might not approve of this feeding method. However, since there are several species of carnivores in zoos that feed from large carcasses in nature, this food type also has the potential to be beneficial to their welfare. In intelligent and usually inquisitive scavengers like vultures, a lack of activity and behavioral opportunities could be a welfare problem in captivity; providing them with a more complex food item might …

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Modeling Survival Of Immature Loggerheads (Caretta Caretta) And Green Turtles (Chelonia Mydas) From 10 Years Of Mark-Recapture Data At The Florida Power And Light St. Lucie Plant, Andrew Sterner Jan 2013

Modeling Survival Of Immature Loggerheads (Caretta Caretta) And Green Turtles (Chelonia Mydas) From 10 Years Of Mark-Recapture Data At The Florida Power And Light St. Lucie Plant, Andrew Sterner

Electronic Theses and Dissertations

Loggerheads (Caretta caretta) are listed as Threatened and green turtles (Chelonia mydas) are listed as Endangered under the United States Endangered Species Act. While green turtle nest production in Florida has increased markedly in recent years, loggerhead nest production has followed a more tenuous path. Reasons for these differences are unknown. Limited demographic information is available for these species of conservation concern. I used Barker models, which incorporated mark-recapture, live-resight and dead recovery data, implemented in Program MARK. These models were used to estimate apparent survival for immature loggerhead (

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Disturbance-Based Management And Plant Species Change In Massachusetts Sandplain Heathlands Over The Past Two Decades, Kirsten Martin Jan 2013

Disturbance-Based Management And Plant Species Change In Massachusetts Sandplain Heathlands Over The Past Two Decades, Kirsten Martin

Electronic Theses and Dissertations

Massachusetts sandplain heathlands are habitats of conservation concern, harboring many rare plant species and providing habitat for animals that depend on openlands. These heathlands are threatened by human development, shrub encroachment in the absence of disturbance, and potentially increasing soil nutrient levels. Sandplain heathlands are managed with prescribed fire, in order to maintain their open structure and maintain species diversity. In order to assess how past management was correlated with species change, I used a data set that spanned twenty years from three different heathlands in Massachusetts. I looked for correlations between management and species change. Correlations between species change …

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R.A. Fisher And The Foundations Of Statistical Biology, Michael Dietrich Jan 2013

R.A. Fisher And The Foundations Of Statistical Biology, Michael Dietrich

Dartmouth Scholarship

Chapter eight, addressing the topic of statistical biology and statistical methods in genetics.

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Wetland Diversity In A Disturbance-Maintained Landscape: Effects Of Fire And A Fire Surrogate On Aquatic Amphibian Survival And Species Depauperateness., Joyce Klaus Jan 2013

Wetland Diversity In A Disturbance-Maintained Landscape: Effects Of Fire And A Fire Surrogate On Aquatic Amphibian Survival And Species Depauperateness., Joyce Klaus

Electronic Theses and Dissertations

Disturbance is one of the central concepts explaining how diversity arises and is perpetuated in ecological time. A good model system for testing hypotheses related to disturbance is the longleaf pine ecosystem in the southeastern U.S. because in this ecosystem frequent, low-severity fires acts as a disturbance that maintains a unique vegetation structure and high species richness. Vegetation structure influences animal distributions; in fire-dependent ecosystems many animals rely on open-structured, fire-maintained vegetation but shrubs and trees encroach into fire-dependent ecosystems where fire has been excluded. Prescribed burning and mechanical removal are commonly used as restoration tools to control encroachment. To …

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Biogeography And Systematics Of The Nerodia Clarkii/Nerodia Fasciata Clade In Florida, Gregory Territo Jan 2013

Biogeography And Systematics Of The Nerodia Clarkii/Nerodia Fasciata Clade In Florida, Gregory Territo

Electronic Theses and Dissertations

Biogeography provides a window into the evolutionary history of populations, and helps explain the diversity and distribution of life through time. Viewed from a systematic perspective, biogeographic studies generate convincing arguments to explain the relationships among organisms and categorize them into useful taxonomies. When taxonomies do not reflect evolutionary histories, inaccurate representations of biodiversity confound future studies and conservation efforts. Two thamnophiine snakes, Nerodia clarkii and Nerodia fasciata, harbor unique morphological and ecological adaptations that obscured natural groupings, leading to controversial taxonomic delimitations. Additionally, population declines documented in N. clarkii compressicauda and N. clarkii taeniata led managers to list N. …

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Estimated Diets, Diet Overlap, And Winter Habitat Associations Of Four Grassland Sparrows In Florida Dry Prairie, Marianne Korosy Jan 2013

Estimated Diets, Diet Overlap, And Winter Habitat Associations Of Four Grassland Sparrows In Florida Dry Prairie, Marianne Korosy

Electronic Theses and Dissertations

North American grassland birds show long-term population declines that generally exceed the declines of other bird groups. Efforts to conserve grassland birds require knowledge of diet and habitat requirements during both the breeding and nonbreeding periods of annual life cycles. This dissertation investigated sparrow habitat associations within two defined plant communities of the dry prairie ecosystem, the dry-mesic and wet-mesic prairie, for four prescribed fire treatments over two consecutive winters. Grasshopper and Henslow’s sparrows showed higher relative abundance in wet-mesic prairie and Bachman’s Sparrows were more abundant in dry-mesic prairie across all fire treatments. Abundances of Grasshopper and Bachman’s sparrows …

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The Relationship Between Castor Bean Stem Diameter And Extrafloral Nectary Gland Size, Victor D. Carmona, Stephen Line, Kevin Hong Jan 2013

The Relationship Between Castor Bean Stem Diameter And Extrafloral Nectary Gland Size, Victor D. Carmona, Stephen Line, Kevin Hong

Biology Faculty Works

This project sought to characterize plant defense investment in the castor bean (Ricinus communis L.), an exotic myrmecophyte in southern California, with respect to life history strategies. Experimental evidence suggests that exotic myrmecophytes can form mutually beneficial associations with exotic ants regardless of the differences in shared evolutionary histories. Castor bean plant investment in defense was evaluated by measuring the area on extra-floral nectary (EFN) glands. Life history strategies may change with respect to plant size and was therefore evaluated in terms of basal stem diameter (

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Relationship Between Elaiosome And Efn Gland Size In Castor Bean (Ricinus Communis L.), An Exotic Mymercophyte In Southern California, Victor D. Carmona, Andrew Henslin, Lisa Liceaga Jan 2013

Relationship Between Elaiosome And Efn Gland Size In Castor Bean (Ricinus Communis L.), An Exotic Mymercophyte In Southern California, Victor D. Carmona, Andrew Henslin, Lisa Liceaga

Biology Faculty Works

Castor bean (Ricinus communis L.) relies on seed dispersal by attracting ants with elaiosomes; lipid rich seed appendages, which serve as a source of food for ant larvae. Additionally, castor bean petioles and inflorescences have extra floral nectary (EFN) glands that secrete sugars that also attract ants, which in return, defend against herbivores. We propose that in order to attract ants, castor bean would have to balance allocation of energy toward plant defense and seed dispersal per the Principle of Allocation. Specifically, we hypothesized that in castor bean, an increase in elaiosome size would correspond to result in …

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Anthropogenic Impacts Of Irrigation On The Arthropod Community Structure Of A Coastal Sage Scrub Habitat In Los Angeles, Victor D. Carmona, Justin Aquino, Mindi Catala Jan 2013

Anthropogenic Impacts Of Irrigation On The Arthropod Community Structure Of A Coastal Sage Scrub Habitat In Los Angeles, Victor D. Carmona, Justin Aquino, Mindi Catala

Biology Faculty Works

We evaluated the effects of an irrigation system on the community structure of arthropods in a coastal sage scrub chaparral habitat. We placed 5 traps in the irrigated site and 5 traps in control site, for a total of 10 sticky traps (using Tree Tanglefoot) in an area adjacent to Ballona Wetlands in Los Angeles, California. The traps were set at the irrigated and non-irrigated site on Telegraph Weed for one week. Results showed that morphospecies richness, relative abundance, and taxonomic order representation were higher at the control site than at the irrigated site. Our study documents how anthropogenic impacts …

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Behavior And Survival Of Mytilus Congeners Following Episodes Of Elevated Body Temperature In Air And Seawater, W. Wesley Dowd, George N. Somero Jan 2013

Behavior And Survival Of Mytilus Congeners Following Episodes Of Elevated Body Temperature In Air And Seawater, W. Wesley Dowd, George N. Somero

Biology Faculty Works

Coping with environmental stress may involve combinations of behavioral and physiological responses. We examined potential interactions between adult musselsʼ simple behavioral repertoire – opening/closing of the shell valves – and thermal stress physiology in common-gardened individuals of three Mytilus congeners found on the West Coast of North America: two native species (M. californianus and M. trossulus) and one invasive species from the Mediterranean (M. galloprovincialis). We first continuously monitored valve behavior over three consecutive days on which body temperatures were gradually increased, either in air or in seawater. A temperature threshold effect was evident between 25 and 33°C in several …

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Factors Affecting Diporeia Growth Rates In Lake Superior, Miles J. Corcoran Jan 2013

Factors Affecting Diporeia Growth Rates In Lake Superior, Miles J. Corcoran

Dissertations, Master's Theses and Master's Reports - Open

An ability to predict population dynamics of the amphipod Diporeia is important in understanding how energy pathways in the Lake Superior food web might be altered by disturbances to the ecosystem. Estimating growth rates for this prominent prey item for fish requires information on the physiological effects of changes to its environment. These effects have been investigated for Diporeia in other Great Lakes, but little is known about Lake Superior populations. The primary objective of this study is to obtain quantitative data for rates of Diporeia respiration and consumption that can be incorporated into a bioenergetics model for Lake Superior. …

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Computational Prediction Of The Sporulation Network In Clostridium Thermocellum, Changyi Jiang Jan 2013

Computational Prediction Of The Sporulation Network In Clostridium Thermocellum, Changyi Jiang

Dissertations, Master's Theses and Master's Reports - Open

Sporulation is a process in which some bacteria divide asymmetrically to form tough protective endospores, which help them to survive in a hazardous environment for a quite long time. The factors which can trigger this process are diverse. Heat, radiation, chemicals and lacking of nutrition can all lead to the formation of endospores. This phenomenon will lead to low productivity during industrial production. However, the sporulation mechanism in a spore-forming bacterium, Clostridium theromcellum, is still unclear. Therefore, if a regulation network of sporulation can be built, we may figure out ways to inhibit this process. In this study, a …

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Production Of 1,3-Propanediol From Glycerol Under Haloalkaline Conditions By Halanaerobium Hydrogeniformans, Daniel William Roush Jan 2013

Production Of 1,3-Propanediol From Glycerol Under Haloalkaline Conditions By Halanaerobium Hydrogeniformans, Daniel William Roush

Masters Theses

"With increased demands around the world to make modern lifestyles more environmentally friendly, the chemical commodity market has rapidly shifted. Through new technologies in chemical production, certain high value products have oversaturated the market and have become high-volume, low value waste products. The expansion of biodiesel production offers a prime example; high volumes of glycerol byproduct from this process have shifted glycerol from a high priced commodity to a common waste product. A number of microorganisms are known to synthesize the polymeric precursor 1,3-propanediol from glycerol; however, crude glycerol from biodiesel production creates a harsh environment for most microbes, and …

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Wetting And Drying Cycles And The Fungal Communities On Leaf Litter In Streams, Kele Qwinn Thrailkill Jan 2013

Wetting And Drying Cycles And The Fungal Communities On Leaf Litter In Streams, Kele Qwinn Thrailkill

Masters Theses

"Leaf litter is a major source of energy for streams in deciduous forests. Fungi play a critical role by converting the leaves into nutritional material for the rest of the food web. The breakdown of leaf litter and associated biota, including invertebrates and fungi, have been proposed as measures of stream health in systems affected by anthropogenic activity. Rates of leaf breakdown can be depressed in streams affected by acidity, metals, organic contaminants, and other stressors. Climate change may lead to alterations in stream hydrology such that streams experience more frequent floods as well as drying episodes. Fungal communities can …

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Changes During Late-Stage Embryonic Development From Egg-Juvenile To Free-Living Hatchling Crab , J Xue, Y Liu, Neil Cumberlidge, H Wu Jan 2013

Changes During Late-Stage Embryonic Development From Egg-Juvenile To Free-Living Hatchling Crab , J Xue, Y Liu, Neil Cumberlidge, H Wu

Journal Articles

No abstract provided.

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The Effects Of Harvest Regime, Irrigation, And Salinity On Stem Lignocellulosic Concentrations In Alfalfa (Medicago Sativa L.), Adam Harvey Warnke Jan 2013

The Effects Of Harvest Regime, Irrigation, And Salinity On Stem Lignocellulosic Concentrations In Alfalfa (Medicago Sativa L.), Adam Harvey Warnke

All Graduate Theses, Dissertations, and Other Capstone Projects

Rapid consumption of crude oil reserves has made it necessary to find methods of processing a renewable and sustainable feedstock for conversion into ethanol. Lignocellulosic feedstocks are promising because they are typically environmentally friendly and can meet the high-yield potential necessary for ethanol production. Alfalfa (Medicago sativa L.) has promise as a feedstock for ethanol production because of its high biomass yields, perennial-habit, relationship with nitrogen-fixing bacteria, and other co-products. This study focused on the effects of harvest regime, irrigation, and salinity on stem lignocellulosic concentrations in alfalfa for ethanol production during the 2010 and 2011 growing seasons in …

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A Revision Of The New World Ants Of The Genus Platythyrea Roger 1863 (Hymenoptera: Formicidae), Mayra Janett Leyva Jan 2013

A Revision Of The New World Ants Of The Genus Platythyrea Roger 1863 (Hymenoptera: Formicidae), Mayra Janett Leyva

Open Access Theses & Dissertations

The genus Platythyrea consists of arboreal ants that are rarely collected. The genus was last partially revised in 1975 by Brown. Since that revision two additional species have been described. The New World genus Platythyrea now includes nine species: P. angusta Forel, P. exigua Kempf, P. lenca De Andrade, P. pilosula (Smith), P. prizo Kugler, P. punctata (Smith), P. sinuata (Roger), P. strenua Wheeler and P. zodion Brown. A new key, illustrations, diagnoses and distributions of the ants are provided.

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