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Articles 1 - 30 of 107
Full-Text Articles in Life Sciences
Differential Requirements Of Two Reca Mutants For Constitutive Sos Expression In Escherichia Coli K-12, Steven Sandler, Jarukit Edward Long, Nicholas Renzette, Richard Centore
Differential Requirements Of Two Reca Mutants For Constitutive Sos Expression In Escherichia Coli K-12, Steven Sandler, Jarukit Edward Long, Nicholas Renzette, Richard Centore
Steven Sandler
Background Repairing DNA damage begins with its detection and is often followed by elicitation of a cellular response. In E. coli, RecA polymerizes on ssDNA produced after DNA damage and induces the SOS Response. The RecA-DNA filament is an allosteric effector of LexA auto-proteolysis. LexA is the repressor of the SOS Response. Not all RecA-DNA filaments, however, lead to an SOS Response. Certain recA mutants express the SOS Response (recAC) in the absence of external DNA damage in log phase cells. Methodology/Principal Findings Genetic analysis of two recAC mutants was used to determine the mechanism of constitutive SOS (SOSC) expression …
Two Leucine-Rich Repeat Receptor Kinases Mediate Signaling, Linking Cell Wall Biosynthesis And Acc Synthase In Arabidopsis, Shou-Ling Xu, Abidur Rahman, Tobias Baskin, Joseph J. Kieber
Two Leucine-Rich Repeat Receptor Kinases Mediate Signaling, Linking Cell Wall Biosynthesis And Acc Synthase In Arabidopsis, Shou-Ling Xu, Abidur Rahman, Tobias Baskin, Joseph J. Kieber
Tobias Baskin
The plant cell wall is a dynamic structure that changes in response to developmental and environmental cues through poorly understood signaling pathways. We identified two Leu-rich repeat receptor-like kinases in Arabidopsis thaliana that play a role in regulating cell wall function. Mutations in these FEI1 and FEI2 genes (named for the Chinese word for fat) disrupt anisotropic expansion and the synthesis of cell wall polymers and act additively with inhibitors or mutations disrupting cellulose biosynthesis. While FEI1 is an active protein kinase, a kinase-inactive version of FEI1 was able to fully complement the fei1 fei2 mutant. The expansion defect in …
Local Chef Inspires Healthy And Economical Cooking -- In A Flash, Madeleine K. Charney
Local Chef Inspires Healthy And Economical Cooking -- In A Flash, Madeleine K. Charney
Madeleine K. Charney
Local chef, Leslie Cerier, offers thought-provoking workshops about eating whole foods.
Local Chef Inspires Healthy And Economical Cooking -- In A Flash, Madeleine K. Charney
Local Chef Inspires Healthy And Economical Cooking -- In A Flash, Madeleine K. Charney
University Libraries Publication Series
Local chef, Leslie Cerier, offers thought-provoking workshops about eating whole foods.
Intercourse Between Cell Wall And Cytoplasm Exemplified By Arabinogalactan Proteins And Cortical Microtubules, Azeddine Driouich, Tobias Baskin
Intercourse Between Cell Wall And Cytoplasm Exemplified By Arabinogalactan Proteins And Cortical Microtubules, Azeddine Driouich, Tobias Baskin
Tobias Baskin
How does a plant cell sense and respond to the status of its cell wall? Intercourse between cell wall and cytoplasm has long been supposed to involve arabinogalactan proteins, in part because many of them are anchored to the plasma membrane. Disrupting arabinogalactan proteins has recently been shown to disrupt the array of cortical microtubules present just inside the plasma membrane, implying that microtubules and arabinogalactan proteins interact. In this article, we assess possibilities for how this interaction might be mediated. First, we consider microdomains in the plasma membrane (lipid rafts), which have been alleged to link internal and external …
Exploitative Competition Between Invasive Herbivores Benefits A Native Host Plant, Joseph Elkinton, E. L. Preisser
Exploitative Competition Between Invasive Herbivores Benefits A Native Host Plant, Joseph Elkinton, E. L. Preisser
Joseph Elkinton
Although biological invasions are of considerable concern to ecologists, relatively little attention has been paid to the potential for and consequences of indirect interactions between invasive species. Such interactions are generally thought to enhance invasives' spread and impact (i.e., the “invasional meltdown” hypothesis); however, exotic species might also act indirectly to slow the spread or blunt the impact of other invasives. On the east coast of the United States, the invasive hemlock woolly adelgid (Adelges tsugae, HWA) and elongate hemlock scale (Fiorinia externa, EHS) both feed on eastern hemlock (Tsuga canadensis). Of the two insects, HWA is considered far more …
Graphite Electrode As A Sole Electron Donor For Reductive Dechlorination Of Tetrachlorethene By Geobacter Lovleyi, Derek Lovley, Sarah M. Strycharz, Trevor L. Woodard, Jessica P. Johnson, Kelly P. Nevin, Robert A. Stanford, Frank E. Lӧffler
Graphite Electrode As A Sole Electron Donor For Reductive Dechlorination Of Tetrachlorethene By Geobacter Lovleyi, Derek Lovley, Sarah M. Strycharz, Trevor L. Woodard, Jessica P. Johnson, Kelly P. Nevin, Robert A. Stanford, Frank E. Lӧffler
Derek Lovley
The possibility that graphite electrodes can serve as the direct electron donor for microbially catalyzed reductive dechlorination was investigated with Geobacter lovleyi. In an initial evaluation of whether G. lovleyi could interact electronically with graphite electrodes, cells were provided with acetate as the electron donor and an electrode as the sole electron acceptor. Current was produced at levels that were ca. 10-fold lower than those previously reported for Geobacter sulfurreducens under similar conditions, and G. lovleyi anode biofilms were correspondingly thinner. When an electrode poised at −300 mV (versus a standard hydrogen electrode) was provided as the electron donor, G. …
The Role Of Gtp Binding And Hydrolysis At The Attoc159 Preprotein Receptor During Protein Import Into Chloroplasts, Danny Schnell, F. Wang, B. Agne, F. Kessler
The Role Of Gtp Binding And Hydrolysis At The Attoc159 Preprotein Receptor During Protein Import Into Chloroplasts, Danny Schnell, F. Wang, B. Agne, F. Kessler
Danny Schnell
The majority of nucleus-encoded chloroplast proteins are targeted to the organelle by direct binding to two membrane-bound GTPase receptors, Toc34 and Toc159. The GTPase activities of the receptors are implicated in two key import activities, preprotein binding and driving membrane translocation, but their precise functions have not been defined. We use a combination of in vivo and in vitro approaches to study the role of the Toc159 receptor in the import reaction. We show that atToc159-A864R, a receptor with reduced GTPase activity, can fully complement a lethal insertion mutation in the ATTOC159 gene. Surprisingly, the atToc159-A864R receptor increases the rate …
Highly Conserved Genes In Geobacter Species With Expression Patterns Indicative Of Acetate Limitation, Derek Lovley, Carla Risso, Barbara A. Methé, Hila Elifantz, Dawn E. Holmes
Highly Conserved Genes In Geobacter Species With Expression Patterns Indicative Of Acetate Limitation, Derek Lovley, Carla Risso, Barbara A. Methé, Hila Elifantz, Dawn E. Holmes
Derek Lovley
Analysis of the genome of Geobacter sulfurreducens revealed four genes encoding putative symporters with homology to ActP, an acetate transporter in Escherichia coli. Three of these genes, aplA, aplB and aplC, are highly similar (over 90 % identical) and fell within a tight phylogenetic cluster (Group I) consisting entirely of Geobacter homologues. Transcript levels for all three genes increased in response to acetate limitation. The fourth gene, aplD, is phylogenetically distinct (Group II) and its expression was not influenced by acetate availability. Deletion of any one of the three genes in Group I did not significantly affect acetate-dependent growth, suggesting …
Graded Hedgehog And Fibroblast Growth Factor Signaling Independently Regulate Pituitary Cell Fates And Help Establish The Pars Distalis And Pars Intermedia Of The Zebrafish Adenohypophysis, Burcu Guner, A. Tuba Ozacar, Jeanne E. Thomas, Rolf O. Karlstrom
Graded Hedgehog And Fibroblast Growth Factor Signaling Independently Regulate Pituitary Cell Fates And Help Establish The Pars Distalis And Pars Intermedia Of The Zebrafish Adenohypophysis, Burcu Guner, A. Tuba Ozacar, Jeanne E. Thomas, Rolf O. Karlstrom
Rolf O Karlstrom
The vertebrate adenohypophysis forms as a placode at the anterior margin of the neural plate, requiring both hedgehog (Hh) and fibroblast growth factor (Fgf) mediated cell-cell signaling for induction and survival of endocrine cell types. Using small molecule inhibitors to modulate signaling levels during zebrafish development we show that graded Hh and Fgf signaling independently help establish the two subdomains of the adenohypophysis, the anteriorly located pars distalis (PD) and the posterior pars intermedia (PI). High levels of Hh signaling are required for formation of the PD and differentiation of anterior endocrine cell types, whereas lower levels of Hh signaling …
Regulation Of Cancer Stem Cells By P53, D. Joseph Jerry, Luwei Tao, Haoheng Yan
Regulation Of Cancer Stem Cells By P53, D. Joseph Jerry, Luwei Tao, Haoheng Yan
D. Joseph Jerry
The hypothesis that cancer stem cells are responsible for the chemoresistant and metastatic phenotypes of many breast cancers has gained support using cell-sorting strategies to enrich the tumor-initiating population of cells. The mechanisms regulating the cancer stem cell pool, however, are less clear. Two recent publications suggest that loss of p53 permits expansion of presumptive cancer stem cells in mouse mammary tumors and in human breast cell lines. These results add restriction of cancer stem cells as a new tumor suppressor activity attributed to p53.
Graphite Electrode As A Sole Electron Donor For Reductive Dechlorination Of Tetrachlorethene By Geobacter Lovleyi, Sarah M. Strycharz, Trevor L. Woodard, Jessica P. Johnson, Kelly P. Nevin, Robert A. Stanford, Frank E. Lӧffler, Derek Lovley
Graphite Electrode As A Sole Electron Donor For Reductive Dechlorination Of Tetrachlorethene By Geobacter Lovleyi, Sarah M. Strycharz, Trevor L. Woodard, Jessica P. Johnson, Kelly P. Nevin, Robert A. Stanford, Frank E. Lӧffler, Derek Lovley
Kelly Nevin
The possibility that graphite electrodes can serve as the direct electron donor for microbially catalyzed reductive dechlorination was investigated with Geobacter lovleyi. In an initial evaluation of whether G. lovleyi could interact electronically with graphite electrodes, cells were provided with acetate as the electron donor and an electrode as the sole electron acceptor. Current was produced at levels that were ca. 10-fold lower than those previously reported for Geobacter sulfurreducens under similar conditions, and G. lovleyi anode biofilms were correspondingly thinner. When an electrode poised at −300 mV (versus a standard hydrogen electrode) was provided as the electron donor, G. …
Genome-Wide Gene Expression Patterns And Growth Requirements Suggest That Pelobacter Carbinolicus Reduces Fe(Iii) Indirectly Via Sulfide Production, Derek Lovley, Shelley A. Haveman, Raymond J. Didonato Jr, Laura Villanueva, Evgenya S. Shelobolina, Bradley L. Postier, Bo Xu, Anna Liu
Genome-Wide Gene Expression Patterns And Growth Requirements Suggest That Pelobacter Carbinolicus Reduces Fe(Iii) Indirectly Via Sulfide Production, Derek Lovley, Shelley A. Haveman, Raymond J. Didonato Jr, Laura Villanueva, Evgenya S. Shelobolina, Bradley L. Postier, Bo Xu, Anna Liu
Derek Lovley
Although Pelobacter species are closely related to Geobacter species, recent studies suggested that Pelobacter carbinolicus may reduce Fe(III) via a different mechanism because it lacks the outer-surface c-type cytochromes that are required for Fe(III) reduction by Geobacter sulfurreducens. Investigation into the mechanisms for Fe(III) reduction demonstrated that P. carbinolicus had growth yields on both soluble and insoluble Fe(III) consistent with those of other Fe(III)-reducing bacteria. Comparison of whole-genome transcript levels during growth on Fe(III) versus fermentative growth demonstrated that the greatest apparent change in gene expression was an increase in transcript levels for four contiguous genes. These genes encode two …
Estrogen And Progesterone Induce Persistent Increases In P53-Dependent Apoptosis And Suppress Mammary Tumors In Balb/C-Trp53+/- Mice, D. Joseph Jerry, K.A. Dunphy, A.C. Blackburn, H. Yan, L.R. O'Connell
Estrogen And Progesterone Induce Persistent Increases In P53-Dependent Apoptosis And Suppress Mammary Tumors In Balb/C-Trp53+/- Mice, D. Joseph Jerry, K.A. Dunphy, A.C. Blackburn, H. Yan, L.R. O'Connell
D. Joseph Jerry
Introduction - Treatment with estrogen and progesterone (E+P) mimics the protective effect of parity on mammary tumors in rodents and depends upon the activity of p53. The following experiments tested whether exogenous E+P primes p53 to be more responsive to DNA damage and whether these pathways confer resistance to mammary tumors in a mouse model of Li-Fraumeni syndrome. Methods Mice that differ in p53 status (Trp53+/+, Trp53+/-, Trp53-/-) were treated with E+P for 14 days and then were tested for p53-dependent responses to ionizing radiation. Responses were also examined in parous and age-matched virgins. The effects of hormonal exposures on …
Cranberry Production: A Guide For Massachusetts - Summary Edition, Hilary Sandler, Carolyn Demoranville
Cranberry Production: A Guide For Massachusetts - Summary Edition, Hilary Sandler, Carolyn Demoranville
Cranberry Production Guide
No abstract provided.
Development And Assessment Of Role-Play Scenarios For Teaching Rcr, Michael C. Loui, Bradley J. Brummel, C. K. Gunsalus, Kerri L. Kristich
Development And Assessment Of Role-Play Scenarios For Teaching Rcr, Michael C. Loui, Bradley J. Brummel, C. K. Gunsalus, Kerri L. Kristich
Ethics in Science and Engineering National Clearinghouse
No abstract provided.
Amount Of Time Spent In Sedentary Behaviors In The United States, 2003–2004, Charles Matthews, Kong Chen, Patty Freedson, Maciej Buchowski, Bettina Beech, Russell Pate, Richard Troiano
Amount Of Time Spent In Sedentary Behaviors In The United States, 2003–2004, Charles Matthews, Kong Chen, Patty Freedson, Maciej Buchowski, Bettina Beech, Russell Pate, Richard Troiano
Patty S. Freedson
Sedentary behaviors are linked to adverse health outcomes, but the total amount of time spent in these behaviors in the United States has not been objectively quantified. The authors evaluated participants from the 2003–2004 National Health and Nutrition Examination Survey aged ≥6 years who wore an activity monitor for up to 7 days. Among 6,329 participants with at least one 10-hour day of monitor wear, the average monitor-wearing time was 13.9 hours/day (standard deviation, 1.9). Overall, participants spent 54.9% of their monitored time, or 7.7 hours/day, in sedentary behaviors. The most sedentary groups in the United States were older adolescents …
Heat Shock Protein 101 Effects In A. Thaliana: Genetic Variation, Fitness And Pleiotropy In Controlled Temperature Conditions., S. J. Tonsor, C. Scott, I. Boumaza, Elizabeth Vierling
Heat Shock Protein 101 Effects In A. Thaliana: Genetic Variation, Fitness And Pleiotropy In Controlled Temperature Conditions., S. J. Tonsor, C. Scott, I. Boumaza, Elizabeth Vierling
Elizabeth Vierling
The Hsp100/ClpB heat shock protein family is ancient and required for high temperature survival, but natural variation in expression and its phenotypic effects is unexplored in plants. In controlled environment experiments, we examined the effects of variation in the Arabidopsis cytosolic AtHsp101 (hereafter Hsp101). Ten wild-collected ecotypes differed in Hsp101 expression responses across a 22 to 40 degrees C gradient. Genotypes from low latitudes expressed the least Hsp101. We tested fitness and pleiotropic consequences of varying Hsp101 expression in 'control' vs. mild thermal stress treatments (15/25 degrees C D/N vs. 15/25 degrees D/N plus 3 h at 35 degrees C …
Exploiting Position Effects And The Gypsy Retrovirus Insulator To Engineer Precisely Expressed Transgenes, Michele Markstein, Chrysoula Pitsouli, Christians Villalta, Susan E. Celniker, Norbert Perrimon
Exploiting Position Effects And The Gypsy Retrovirus Insulator To Engineer Precisely Expressed Transgenes, Michele Markstein, Chrysoula Pitsouli, Christians Villalta, Susan E. Celniker, Norbert Perrimon
Michele Markstein
A major obstacle to creating precisely expressed transgenes lies in the epigenetic effects of the host chromatin that surrounds them. Here we present a strategy to overcome this problem, employing a Gal4-inducible luciferase assay to systematically quantify position effects of host chromatin and the ability of insulators to counteract these effects at phiC31 integration loci randomly distributed throughout the Drosophila genome. We identify loci that can be exploited to deliver precise doses of transgene expression to specific tissues. Moreover, we uncover a previously unrecognized property of the gypsy retrovirus insulator to boost gene expression to levels severalfold greater than at …
Modulation Of Nitrosative Stress By S-Nitrosoglutathione Reductase Is Critical For Thermotolerance And Plant Growth In Arabidopsis, Ung Lee, Chris Wie, Bernadette O. Fernandez, Martin Feelisch, Elizabeth Vierling
Modulation Of Nitrosative Stress By S-Nitrosoglutathione Reductase Is Critical For Thermotolerance And Plant Growth In Arabidopsis, Ung Lee, Chris Wie, Bernadette O. Fernandez, Martin Feelisch, Elizabeth Vierling
Elizabeth Vierling
Nitric oxide (NO) is a key signaling molecule in plants. This analysis of Arabidopsis thaliana HOT5 (sensitive to hot temperatures), which is required for thermotolerance, uncovers a role of NO in thermotolerance and plant development. HOT5 encodes S-nitrosoglutathione reductase (GSNOR), which metabolizes the NO adduct S-nitrosoglutathione. Two hot5 missense alleles and two T-DNA insertion, protein null alleles were characterized. The missense alleles cannot acclimate to heat as dark-grown seedlings but grow normally and can heat-acclimate in the light. The null alleles cannot heat-acclimate as light-grown plants and have other phenotypes, including failure to grow on nutrient plates, increased reproductive shoots, …
Development Of Genetic And Genomic Research Resources For Brachypodium Distachyon, A New Model System For Grass Crop Research, David F. Garvin, Yonb-Qiang Gu, Robert Hasterok, Samuel P. Hazen, Glyn Jenkins, Todd C. Mockler, Luis A J Mur, John P. Vogel
Development Of Genetic And Genomic Research Resources For Brachypodium Distachyon, A New Model System For Grass Crop Research, David F. Garvin, Yonb-Qiang Gu, Robert Hasterok, Samuel P. Hazen, Glyn Jenkins, Todd C. Mockler, Luis A J Mur, John P. Vogel
Samuel P Hazen
Grass crop genomics research frequently is hindered by large genome sizes and polyploidy. While rice is an attractive system for grass genomics due to its small genome size and available genome sequence, it is not particularly well-suited as a robust model system for all grass crops. The wild grass species Brachypodium distachyon (L.) P. Beauv. (Brachypodium) has recently gained favor as a new model system for grass crop genomics research because it possesses a suite of biological traits desired in a model system. Further, it is more closely related to the large and diverse group of cool season grass crops …
Data Management And Whistle-Blowing, Michael C. Loui
Data Management And Whistle-Blowing, Michael C. Loui
Ethics in Science and Engineering National Clearinghouse
No abstract provided.
Parthenogenetic Activation Of Bovine Oocytes Using Bovine And Murine Phospholipase C Zeta, Pablo J. Ross, Zeki Beyhan, Amy E. Iager, Sook Young Yoon, Christopher Malcuit, Karl Schellander, Rafael Fissore, Jose B. Cibelli
Parthenogenetic Activation Of Bovine Oocytes Using Bovine And Murine Phospholipase C Zeta, Pablo J. Ross, Zeki Beyhan, Amy E. Iager, Sook Young Yoon, Christopher Malcuit, Karl Schellander, Rafael Fissore, Jose B. Cibelli
Rafael Fissore
Background - During natural fertilization, sperm fusion with the oocyte induces long lasting intracellular calcium oscillations which in turn are responsible for oocyte activation. PLCZ1 has been identified as the factor that the sperm delivers into the egg to induce such a response. We tested the hypothesis that PLCZ1 cRNA injection can be used to activate bovine oocytes. Results - Mouse and bovine PLCZ1 cRNAs were injected into matured bovine oocytes at different concentrations. Within the concentrations tested, mouse PLCZ1 injection activated bovine oocytes at a maximum rate when the pipette concentration of cRNA ranged from 0.25 to 1 μg/μL, …
The Degree Of Redundancy In Metabolic Genes Is Linked To Mode Of Metabolism, Derek Lovley, Radhakrishnan Mahadevan
The Degree Of Redundancy In Metabolic Genes Is Linked To Mode Of Metabolism, Derek Lovley, Radhakrishnan Mahadevan
Derek Lovley
An understanding of the factors favoring the maintenance of duplicate genes in microbial genomes is essential for developing models of microbial evolution. A genome-scale flux-balance analysis of the metabolic network of Saccharomyces cerevisiae has suggested that gene duplications primarily provide increased enzyme dosage to enhance metabolic flux because the incidence of gene duplications in essential genes is no higher than that in nonessential genes. Here, we used genome-scale metabolic models to analyze the extent of genetic and biochemical redundancy in prokaryotes that are either specialists, with one major mode of energy generation, or generalists, which have multiple metabolic strategies for …
Core Genome Responses Involved In Acclimation To High Temperature, Jane Larkindale, Elizabeth Vierling
Core Genome Responses Involved In Acclimation To High Temperature, Jane Larkindale, Elizabeth Vierling
Elizabeth Vierling
Plants can acclimate rapidly to environmental conditions, including high temperatures. To identify molecular events important for acquired thermotolerance, we compared viability and transcript profiles of Arabidopsis thaliana treated to severe heat stress (45°C) without acclimation or following two different acclimation treatments. Notably, a gradual increase to 45°C (22°C to 45°C over 6 h) led to higher survival and to more and higher-fold transcript changes than a step-wise acclimation (90 min at 38°C plus 120 min at 22°C before 45°C). There were significant differences in the total spectrum of transcript changes in the two treatments, but core components of heat acclimation …
Elucidation Of An Alternate Isoleucine Biosynthesis Pathway In Geobacter Sulfurreducens, Derek Lovley, Carla Risso, Stephen J. Van Dien, Amber Orloff, Maddalena V. Coppi
Elucidation Of An Alternate Isoleucine Biosynthesis Pathway In Geobacter Sulfurreducens, Derek Lovley, Carla Risso, Stephen J. Van Dien, Amber Orloff, Maddalena V. Coppi
Derek Lovley
The central metabolic model for Geobacter sulfurreducens included a single pathway for the biosynthesis of isoleucine that was analogous to that of Escherichia coli, in which the isoleucine precursor 2-oxobutanoate is generated from threonine. 13C labeling studies performed in G. sulfurreducens indicated that this pathway accounted for a minor fraction of isoleucine biosynthesis and that the majority of isoleucine was instead derived from acetyl-coenzyme A and pyruvate, possibly via the citramalate pathway. Genes encoding citramalate synthase (GSU1798), which catalyzes the first dedicated step in the citramalate pathway, and threonine ammonia-lyase (GSU0486), which catalyzes the conversion of threonine to 2-oxobutanoate, were …
Protein-Passivated Fe3o4 Nanoparticles: Low Toxicity And Rapid Heating For Thermal Therapy, D. Joseph Jerry, Bappaditya Samanta, Haoheng Yan, Nicholas O. Fisher, Jing Shi, Vincent M. Rotello
Protein-Passivated Fe3o4 Nanoparticles: Low Toxicity And Rapid Heating For Thermal Therapy, D. Joseph Jerry, Bappaditya Samanta, Haoheng Yan, Nicholas O. Fisher, Jing Shi, Vincent M. Rotello
D. Joseph Jerry
Thermotherapy is a promising technique for the minimally invasive elimination of solid tumors. Here we report the fabrication of protein -coated iron oxide NPs (12 nm core) for use as thermal therapeutic agents. These albumin-passivated NPs are stable under physiological conditions, with rapid heating and cell killing capacity upon alternating magnetic field (AMF) exposure. The mode of action is specific: no measurable cytotoxicity was observed for the particle without AMF or for AMF exposure without the particle.
Differential Effects Of Methyl Jasmonate On Growth And Division Of Etiolated Zucchini Cotyledons, E Stoynova-Bakalova, Pi Petrov, L Gigova, Ti Baskin
Differential Effects Of Methyl Jasmonate On Growth And Division Of Etiolated Zucchini Cotyledons, E Stoynova-Bakalova, Pi Petrov, L Gigova, Ti Baskin
Biology Department Faculty Publication Series
No abstract provided.
Intercourse Between Cell Wall And Cytoplasm Exemplified By Arabinogalactan Proteins And Cortical Microtubules, A Driouich, Ti Baskin
Intercourse Between Cell Wall And Cytoplasm Exemplified By Arabinogalactan Proteins And Cortical Microtubules, A Driouich, Ti Baskin
Biology Department Faculty Publication Series
No abstract provided.
Morphological Convergence As A Consequence Of Extreme Functional Demands: Examples From The Feeding System Of Natricine Snakes, A Herrel, Se Vincent, Me Alfaro, S Van Wassenbergh, B Vanhooydonck, Dj Irschick
Morphological Convergence As A Consequence Of Extreme Functional Demands: Examples From The Feeding System Of Natricine Snakes, A Herrel, Se Vincent, Me Alfaro, S Van Wassenbergh, B Vanhooydonck, Dj Irschick
Biology Department Faculty Publication Series
Despite repeated acquisitions of aquatic or semi-aquatic lifestyles revolving around piscivory, snakes have not evolved suction feeding. Instead, snakes use frontally or laterally directed strikes to capture prey under water. If the aquatic medium constrains strike performance because of its physical properties, we predict morphological and functional convergence in snakes that use similar strike behaviours. Here we use natricine snakes to test for such patterns of convergence in morphology and function. Our data show that frontal strikers have converged on a similar morphology characterized by narrow elongate heads with a reduced projected frontal surface area. Moreover, simple computational fluid dynamics …