526 - 550 of 649
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CreatorTitleDescriptionSubjectDate
526 Goller, FranzRespiratory motor correlates of song plasticity in young adult zebra finchesYoung adult zebra finches (Taeniopygia guttata, 90150 phd) sing a stereotyped song, but can show rapid changes in song structure if sensory feedback is disrupted. The vocal motor correlates accompanying induced song plasticity have not yet been examined. To investigate motor changes underlying song ...Pattern; Muting; Sound2002
527 Ehleringer, James R.Responses of boreal conifers to climate fluctuations: indications from tree-ring widths and carbon isotope analysesSpatial distribution and species composition of the boreal forest are expected to change under predicted climate change scenarios. Current research indicates that water limitations control the southern boundary of the central Canadian boreal forest and temperature limitations control the northern b...Boreal forests; Carbon budget; Picea mariana; Pinus banksiana; Carbon isotopes1998
528 Clayton, Dale H.Review of the genus Saemundssonia Timmerman (Phthiraptera: Philopteridae) from the Alcidae (Aves: Charadriiformes), including a new species and new host recordsWe describe the new species Saemundssonia boschi recently collected from Least Auklets {Aethia pusilla (Pallas)) in Alaska and review the 11 names previously applied to Saemundssonia Timmermann species from alcids. Saemundssonia procax (Kellogg and Chapman) is relegated to a new junior synonym of S...Saemundssonia; Chewing lice; Saemundssonia boschi; Aethia pusilla; Phthiraptera2003
529 Clayton, Dale H.Revision of the chewing louse genus Formicaphagus (Phthiraptera: Philopteridae) from Neotropical Antbirds and Gnateaters (Aves: Passeriformes)Examination of specimens of the 15 recognized species of Formicaphagus resulted in 6 new synonymies: F. laemostictus, F. latifrons, and F. peruvianus are junior synonyms of F. picturatus; F. huilae of F. angustifrons; and F. bolivianus and F. thoracicus of F. minutus. Two new species are described f...Formicaphagus; Formicaphagus arnoldi; Formicaphagus donpetersi; Antbirds; Gnateaters1996
530 Yamaguchi, AyakoRhythm generation, coordination, and initiation in the vocal pathways of male African clawed frogscentral pattern generator; vocalization; parabrachial area; hindbrain; bilateral coordination; motor programs2016
531 Farmer, Colleen G.Right-to-left shunt of crocodilians serves digestionAll amniotes except birds and mammals have the ability to shunt blood past the lungs, hut the physiological function of this ability is poorly understood. We studied the role of the shunt in digestion in juvenile American alligators in the following ways. First, we characterized the shunt in fasting...Postprandial; Alligators; Gastrointestinal2008
532 Capecchi, Mario R.Role for ELOVL3 and fatty acid chain length in development of hair and skin functionVery little is known about the in vivo regulation of mammalian fatty acid chain elongation enzymes as well as the role of specific fatty acid chain length in cellular responses and developmental processes. Here, we report that the Elovl3 gene product, which belongs to a highly conserved family ...2003-12-15
533 Adler, Frederick R.Role of heterogeneity in the persistence and prevalence of sin nombre virus in deer miceMany diseases persist at a relatively low prevalence, seemingly close to extinction. For a chronic disease in a homogeneous population, reducing the transmission rate by a fraction proportional to the prevalence would be sufficient to eradicate the disease. This study examines how higher prevalence ...Transmission; Survivorship; Seropositivity2008
534 Capecchi, Mario R.Role of Hox genes in mediating the mammalian body planThis is a 1 hour, 5 minutes, 28 seconds video of a lecture given by Mario Capecchi on the genetic analysis of the Hox complex, or Hox cluster and their role in embryogenesis. Using examples such as the development of the hindbrain (rhombencephalon), facial nerves, and hands Capecchi outlines the re...Transgenic mice; Gene targeting; Genetic engineering; Molecular genetics; Homeobox genes; Histology - Pathological; Gene expression; Gene regulation; Genotype; Phenotype
535 Bastiani, MichaelRole of the cell surface in neuronal pathfindingPerhaps the organ of the human body that evokes the most astonishment, and yet is the least understood, is our brain. From the coordination of simple movements, to consciousness and thought, the function of the nervous system relies on the establishment of trillions of precise connections among the...Axon; molecular guidance code; growth cone1996
536 Capecchi, Mario R.Role of the N-terminal catalytic domain of angiotensin-converting enzyme investigated by targeted inactivation in miceAngiotensin-converting enzyme (ACE) produces the vasoconstrictor angiotensin II. The ACE protein is composed of two homologous domains, each binding zinc and each independently catalytic. To assess the physiologic significance of the two ACE catalytic domains, we used gene targeting in mice to int...2004-02-13
537 Moon, Ann M.; Capecchi, Mario R.Roles of Fgf4 and Fgf8 in limb bud initiation and outgrowth.Although numerous molecules required for limb bud formation have recently been identified, the molecular pathways that initiate this process and ensure that limb formation occurs at specific axial positions have yet to be fully elucidated. Based on experiments in the chick, Fgf8 expression in the in...Animals; Apoptosis; Forelimb; Gene Expression Regulation, Developmental; High Mobility Group Proteins; Hindlimb; In Situ Hybridization; Mesoderm; Mice, Mutant Strains; Trans-Activators2004-09
538 Gesteland, Raymond F.; Atkins, John F.; Wills, Norma M.rRNA-mRNA base pairing stimulates a programmed -1 ribosomal frameshiftBase pairing between the 3' end of 16S rRNA and mRNA is shown to be important for the programmed -1 frameshifting utilized in decoding the Escherichia coli dnaX gene. This pairing is the same as the Shine-Dalgarno pairing used by prokaryotic ribosomes in selection of translation initiators, but for ...Frameshifting; Escherichia coli; Binding Sites; Base Composition1994
539 Sperry, John S.Seasonal occurrence of xylem embolism in sugar maple (Acer saccharum)Xylem embolism, the reduction of water flow by air-filled vessels, was measured in a stand of 5- to 8-year-old sugar maple (Acer saccharum Marsh.) saplings growing in a nursery bed in northwestern Vermont. Embolism was quantified as percentage loss in hydraulic conductivity of trunk and branch seg...Xylem pressure; root pressure; dye perfusion1988
540 Secret of life module: on the brink, four profiles in groundbreaking scienceThis is a 15 minutes, 12 seconds segment of the WGBH series, Secret of life. Profiles include Dennis Slamon of UCLA and his work on the oncagenes and the creation of excess receptors that play a significant role in breast cancer; Patricia Steeg of the National Cancer Institute (NCI) and her work on...Transgenic mice; Gene targeting; Genetic engineering; Molecular genetics; Cancer - Research; Capecchi, Mario R.; Science - Moral and ethical aspects; Human chromosome abnormalities - Diagnosis; Gene expression; Gene regulation
541 Ehleringer, James R.Seedling size and survival for Chrysothamnus nauseosusSeedling size and survival in relation to summer drought were examined for Chrysothamnus nauseosus growing under field and greenhouse conditions. In the field, summer survival rates were less than 2% annually for the three years monitored. The effect of initial seedling height on subsequent survival...Chrysothamnus nauseosus; Seedling size; Seedling survival1993
542 Davidson, Diane W.; Rickart, Eric Allan; Keiter, Robert B.Selecting wilderness areas to conserve Utah's biological diversityCongress is currently evaluating the wilderness status of Bureau of Land Management (BLM) public lands in Utah. Wilderness areas play many important roles, and one critical role is the conservation of biological diversity.Bureau of Land Management; Conservation; Endemic species; Exotic species; Cryptobiotic soils; Plants; Bees; Vertebrates1996
543 Adler, Frederick R.; Liou, Theodore G.; Cahill, Barbara C.Selection of patients with cystic fibrosis for lung transplantationLung transplantation is the most aggressive therapy available for end-stage lung disease from cystic fibrosis (CF). A new predictive survival model of CF uses demographic, FEV1, nutritional, microbiologic, and acute exacerbation data to produce precise estimates of 5-year survival.Predicted survival; Living donor; Mechanical ventilation2002
544 Capecchi, Mario R.Selective degradation of abnormal proteins in mammalian tissue culture cells.The degradation rates of several missense mutants of hypoxanthine-guanine phosphoribosyltransferase (EC 2.4.2.8) in mouse L cells are compared to those of the wild-type enzyme. Although the rates of total protein breakdown in the mutant cell lines are identical to that of the parental L cell line, ...Gene Expression Regulation; Mice, Transgenic; Microscopy, Fluorescence1974-12-01
545 Ehleringer, James R.; Belnap, JayneSensitivity of the Colorado plateau to change: climate, ecosystems, and societyThe Colorado Plateau is located in the interior, dry end of two moisture trajectories coming from opposite directions, which have made this region a target for unusual climate fluctuations. A multidecadal drought event some 850 years ago may have eliminated maize cultivation by the first human settl...Colorado Plateau; Biological crust; Climate change; Megadrought; Ranching; Dry crop productivity; Extractive industries; Pueblo Indians; Fremont culture2008
546 Capecchi, Mario R.Sepp1UF forms are N-terminal selenoprotein P truncations that have peroxidase activity when coupled with thioredoxin reductase-1Mouse selenoprotein P (Sepp1) consists of an N-terminal domain (residues 1-239) that contains 1 selenocysteine (U) as residue 40 in a proposed redox-active motif (-UYLC-) and a Cterminal domain (residues 240-361) that contains 9 selenocysteines. Sepp1 transports selenium from the liver to other tiss...2014-01-01
547 Seger, JonSexual dimorphism in the HymenopteraSpectacular sex differences of many kinds occur abundantly among the wasps, bees and ants that make up the insect order Hymenoptera. In some cases these differences are so extreme that males and females of the same species have been classified in different genera for decades, until a chance observa...Reproductive; Insect; Morphology1994
548 Sperry, John S.Shoot dieback during prolonged drought in Ceanothus (Rhamnaceae) chaparral of California: a possible case of hydraulic failureProgressive diebacks of outer canopy branchlets of Ceanothus crassifolius were repeatedly observed after rainless periods up to 9 mo in duration in the Santa Monica Mountains of southern California. Mean xylem pressures of branchlets near the end of drought were as low as -11.2 MPa (N = 22) with a m...Water relations; xylem cavitation; water-stress-induced loss2002
549 Gesteland, Raymond F.Simian virus 40-specific polypeptides in Ad2+ND4- infected cellsA comparison of the proteins synthesized in human cells at late times after infection with adenovirus (Ad2) and with the adeno-simian virus 40 (SV40) hybrid viruses revealed polypeptides of 30,000 and 92,000 molecular weight specific for the hybrid viruses Ad2+ND1 and Ad2+ND4, respectively. Cell-fre...Molecular Weight; Peptide Biosynthesis; RNA, Messenger; Viral Proteins1976
550 Ehleringer, James R.Simplified GIS approach to modeling global leaf water isoscapesThe stable hydrogen (d2H) and oxygen (d18O) isotope ratios of organic and inorganic materials record biological and physical processes through the effects of substrate isotopic composition and fractionations that occur as reactions proceed. At large scales, these processes can exhibit spatial predic...Oxygen isotope ratio; Hydrogen isotope ratio; Leaf water isoscapes; GIS2008
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