UScholar Works
 
Filters: Department: "Biology" Collection: ir_uspace
626 - 650 of 649
Number of results to display per page
CreatorTitleDescriptionSubjectDate
626 Adler, Frederick R.Virulence management in biocontrol agentsAlthough biological control is founded upon the virulence of natural enemies to the targeted pests, there has been little effort to understand how this might change, let alone to manage it. Frank Fenner and colleagues can be credited with being the first (and last!) to monitor changes in virulence ...Pathogens; Management; Natural2002
627 Goller, FranzVocal gestures of shared syllable types in cardinalsIn songbirds, songs are learned by memorization and copying of tutor song and such copies can be remarkably accurate. However, it is not known whether acoustic similarity is generated by equally similar vocal gestures. We studied syringeal and respiratory motor patterns of syllable types shared by u...Cardinalis cardinalis; Vocal gestures; Birdsong syllables; Song syllables1997
628 Goller, FranzVorkommen und Brut des Bienenfressers (Merops apiaster) in Osttirol (Österreich) (Aves: Meropidae)Synopsis: The first record of Bee-eater for the Eastern Tyrol is imparted by KL1MSCH (1950), three further observations are mentioned. In 1983 a breeding place was discovered near Lavant in about 650 m NN. Feeding adults were watched on the 11th and 12th of August. The breeding place is briefly desc...Merops apiaster; Meropidae; Tyrol1984
629 Sperry, John S.Vulnerability to xylem cavitation and the distribution of sonoran desert vegetationWe studied 15 riparian and upland Sonoran desert species to evaluate how the limitation of xylem pressure (Vx) by cavitation corresponded with plant distribution along a moisture gradient. Riparian species were obligate riparian trees (Fraxinus velutina, Populus fremontii, and Salix gooddingii), nat...Comparative approach; species distribution; xylem conducting efficency2000
630 Ehleringer, James R.Water and nitrogen uptake patterns following moisture pulses in a cold desert communityVariation in the ability to utilize pulses of both water and nitrogen (N) is one possible mechanism allowing the coexistence of species in the cold desert community on the Colorado Plateau. We simulated 25-mm precipitation events and used stable isotope tracers (2H and 15N) to follow water and N upt...Colorado Plateau; Desert perennials; Nitrogen uptake patterns; Pulse utilization; Resource partitioning; Stable isotopes; Water uptake patterns2000
631 Sperry, John S.Water transport in vesselless angiosperms: conducting efficiency and cavitation safetyTwo structure-function hypotheses were tested for vesselless angiosperm wood. First, vesselless angiosperm wood should have much higher flow resistance than conifer wood because angiosperm tracheids lack low-resistance torus-margo pits. Second, vesselless wood ought to be exceptionally safe from cav...2007
632 Coley, Phyllis D.What's up? Perspectives from the first international forest canopy conference at Sarasota, Florida, 1994Jumars, caribineers, pole pruners, tree bicycles, Bosun's chairs, booms, peconhas . . . these terms are not listed in most biological dictionaries. Nor are construction cranes or large treehouses or hot-air dirigibles listed as priority equipment for any scientific laboratories. But these are th...1995
633 Goller, FranzWhite-crowned sparrows tutored with syllable pairs can produce full songsDuring their 'sensitive period', young songbirds develop an 'acquired template', representing a memory of the song(s) that it hears. Later, during the sensorimotor phase, birds use this template to evaluate, via auditory feedback, their vocalizations.Acquired template; Sensorimotor period; Temporal isolation2003
634 Robison, Reid JustinWhole Exome Sequencing Reveals the Genetic Basis of a Case of Idiopathic Hemolytic Anemia and Suggests Candidate Rare Variants for ADHD in a Utah Pedigree2011
635 Sperry, John S.Winter xylem embolism and spring recovery in Betula cordifolia, Fagus grandifolia, Abies balsamea, and Picea rubensXylem embolism was monitored from mid-winter to mid-summer in four co-occurring species: Betula cordifolia (Reg.) Fern., Fagus grandifolia Ehrh., Abies balsamea (L.) Mill., Picea rubens Sarg. The study site was a west-facing slope in the northern Green Mountains of Vermont, U.S.A.; Betula and conife...Conductivity; Hydraulic; Trees1993
636 Sekercioglu, CaganThe worldwide variation in avian clutch size across species and spaceTraits such as clutch size vary markedly across species and environmental gradients but have usually been investigated from either a comparative or a geographic perspective, respectively. We analyzed the global variation in clutch size across 5,290 bird species, excluding brood parasites and pelagic...2008-01-01
637 Jorgensen, ErikWormwholes: a commentary on K. F. Schaffner's "Genes, behavior, and developmental emergentismAlthough Caenorhabditis elegans was chosen and modified to be an organism that would facilitate a reductionist program for neurogenetics, recent research has provided evidence for properties that are emergent from the neurons. While neurogenetic advances have been made using C elegans which may be u...Organism; Neurons; Genotype1998
638 Capecchi, Mario R.Xanthine oxidoreductase is central to the evolution and function of the innate immune system.The housekeeping enzyme xanthine oxidoreductase (XOR) has been studied intensively over the past 100 years, yet the complexity of its in vivo function is still poorly understood. A large body of literature focuses on the different catalyltic forms of XOR and their importance in the synthesis of reac...Animals; Gene Expression Regulation, Enzymologic; Humans; Immune System; Models, Biological2003-09-01
639 Sperry, John S.Xylem hydraulics and the soil-plant-atmosphere continuum: opportunities and unresolved issuesReceived for publication July 23, 2002. Soil and xylem are similar hydraulically. An unsaturated conductivity curve for soil is called a vulnerability curve for xylem?but the underlying physical basis is the same. Thus, any transport model that treats unsaturated soil conductivity would benefit by a...Soil?plant?atmosphere continuum; Water potential2003
640 Capecchi, Mario R.Yeast super-suppressors are altered tRNAs capable of translating a nonsense codon in vitro.tRNA isolated from two different yeast super-suppressor strains translates a known nonsense mutation in vitro, whereas tRNA from a closely related nonsuppressing strain does not. Suppression was assayed by translation of RNA isolated from an amber coat mutant of bacteriophage Qbeta (GB11) in a prote...Codon; Escherichia coli; Protein Biosynthesis1975-11
641 Beckerle, Mary C.Zyxin and cCRP: Two interactive LIM domain proteins associated with the cytoskeletonInteraction with extracellular matrix can trigger a variety of responses by cells including changes in specific gene expression and cell differentiation. The mechanism by which cell surface events are coupled to the transcriptional machinery is not understood, however, proteins localized at sites o...Zyxin; Cysteine-rich proteins; cCRP; LIM domain1992
642 Olivera, Baldomero M.; Hillyard, David R.; Gray, William Robertĸ-Conotoxin PVIIA is a peptide inhibiting the Shaker K+ channelĸ-Conotoxin PVIIA (k-PVIIA), a 27-amino acid toxin from Conus purpurascens venom that inhibits the Shaker potassium channel, was chemically synthesized in a biologically active form. The disulfide connectivity of the peptide was determined. ĸ-Conotoxin PVIIA has the following structure.Conotoxins; k-Conotoxin PVIIA; Conus purpurascens1998
643 Olivera, Baldomero M.; ; McIntosh, J. Michaelα-Conotoxin AuIB selective blocks α3ß4 nicotinic acetylcholine receptors and nicotine-evoked norepinephrine releaseNeuronal nicotinic acetylcholine receptors (nAChRs) with putative α3ß4-subunits have been implicated in the mediation of signaling in various systems, including ganglionic transmission peripherally and nicotine-evoked neurotransmitter release centrally. However, progress in the characterization of...Conotoxins; a-Conotoxin AuIB; Norepinephrine release1998
644 Olivera, Baldomero M.; McIntosh, J. Michael; Yoshikami, Dojuα-Conotoxin GIC from Conus geographus, a novel peptide antagonist of nicotinic acetylcholine receptorsMany venomous organisms produce toxins that disrupt neuromuscular communication to paralyze their prey. One common class of such toxins comprises nicotinic acetylcholine receptor antagonists (nAChRs). Thus, most toxins that act on nAChRs are targeted to the neuromuscular subtype. The toxin chara...Conotoxins; Conotoxin GIC; Conus geographus; Peptide antagonists2002
645 Olivera, Baldomero M.; McIntosh, J. Michaelα-Conotoxin MII blocks nicotine-stimulated dopamine release in rat striatal synaptosomesActivation of presynaptic nicotinic acetylcholine receptors (nAChRs) can induce the release of neurotransmitters such as dopamine and norepinephrine in the CNS. Accumulating evidence suggests that distinct nAChR subtypes are involved; however, it has been difficult to determine the subunit composit...Conotoxins; a-Conotoxin MII1997
646 Olivera, Baldomero M.; McIntosh, J. Michaelα-Conotoxins ImI and ImII: similar α7 nicotinic receptor antagonists act at different sitesA novel conotoxin, α-conotoxin ImII (α-CTx ImII), identified from Conus imperialis venom ducts, was chemically synthesized. A previously characterized C. imperialis conotoxin, α-conotoxin ImI (α-CTx ImI), is closely related; 9 of 12 amino acids are identical. Both α-CTx ImII and α-CTx ImI...Conotoxins; Conotoxin ImI; Conotoxin ImII2003
647 Olivera, Baldomero M.; McIntosh, J. Michael; Gray, William Robertγ-Carboxyglutamate in a neuroactive toxinThe venom of a fish-hunting cone snail (Conus geographus) contains a novel toxin, the "sleeper" peptide, which induces a sleep-like state in mice when injected intracerebrally. We demonstrate that this peptide contains 5 mol of γ-carboxyglutamate (Gla) in 17 amino acids. The amino acid sequence o...Conus geographus; Venom; Conotoxins; gamma-Carboxyglutamate; Neurotoxins1984
648 Olivera, Baldomero M.; Gray, William Robert; Hillyard, David R.μ-Conotoxin PIIIA, a new peptide for discriminating among tetrodotoxin-sensitive Na channel subtypesWe report the characterization of a new sodium channel blocker, m-conotoxin PIIIA (m-PIIIA). The peptide has been synthesized chemically and its disulfide bridging pattern determined.Conotoxins; m-Conotoxin PIIIA; Sodium channel blockers1998
649 Jorgensen, Erikμ2 adaptin facilitates but is not essential for synaptic vesicle recycling in Caenorhabditis elegansSynaptic vesicles must be recycled to sustain neurotransmission, in large part via clathrin-mediated endocytosis. Clathrin is recruited to endocytic sites on the plasma membrane by the AP2 adaptor complex. The medium subunit (u 2) of AP2 binds to cargo proteins and phosphatidylinositol-4,5-bisph...Synaptic vesicles; Caenorhabditis elegans; Adaptin2008
626 - 650 of 649