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Digitale Medien

A novel intercistronic regulatory element of prokaryotic operons (1982)

Higgins, Christopher F. ; Ames, Giovanna Ferro-Luzzi ; Barnes, Wayne M. ; [weitere]

[s.l.] : Nature Publishing Group

Nature 298 (1982), S. 760-762

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] The histidine transport operon of S. typhimurium consists of four cistrons, coordinately transcribed from a single promoter (see accompanying letter4). Between the first two genes of this operon, hisJ (encoding the periplasmic histidine-binding protein) and hisO (encoding a membrane-bound protein), ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/298760a0

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2

Digitale Medien

Atom bouncers have it taped (1995)

Itano, Wayne M.

[s.l.] : Nature Publishing Group

Nature 377 (1995), S. 291-292

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] EXPERIMENTERS now have a new set of tricks for manipulating and storing cold atoms — and the key ingredients are familiar high-street commodities. Edward Hinds and co-workers at Yale University have repeatedly bounced rubidium atoms from magnetic tape of the kind used to record audio ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/377291a0

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Digitale Medien

Deficits in auditory temporal and spectral resolution in language-impaired children (1997)

Wright, Beverly A. ; Lombardino, Linda J. ; King, Wayne M. ; [weitere]

[s.l.] : Nature Publishing Group

Nature 387 (1997), S. 176-178

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] We measured the detection threshold for a brief tone presented before, during or after two different masking noises in eight children diagnosed with specific language impairment, and in eight control children with normal language skills who matched the others in age and non-verbal intelligence ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/387176a0

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4

Digitale Medien

Genetic kin recognition: honey bees discriminate between full and half sisters (1983)

Getz, Wayne M. ; Smith, Katherine B.

[s.l.] : Nature Publishing Group

Nature 302 (1983), S. 147-148

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] Queen honey bees mate with a number of different drones before they lay their first eggs11. The sperm, to some extent, mix in the spermatheca and the hive contains several distinct patrilineal worker groups of full sisters while the workers are matrilineal half sisters across groups12'13. In ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/302147a0

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Influence of Oil and Gas Emissions on Summertime Ozone in the Colorado Northern Front Range (2016)

Erin E. McDuffie, Peter M. Edwards, Jessica B. Gilman, Brian M. Lerner, William P. Dubé, Michael Trainer, Daniel E. Wolfe, Wayne M. Angevine, Joost de; Gouw, Eric J. Williams, Alex G. Tevlin, Jennifer G. Murphy, Emily V. Fischer, Stuart McKeen, Thomas B. Ryerson, Jeff Peischl, John S. Holloway, Kenneth Aikin, Andrew O. Langford, Christoph J. Senff, Raul J. Alvarez, Samuel R. Hall, Kirk Ullmann, Kathy O. Lantz, Steven S. Brown

Wiley

In: Journal of Geophysical Research JGR - Atmospheres

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Publikationsdatum: 2016-07-10

Beschreibung: Tropospheric O 3 has been decreasing across much of the eastern U.S. but has remained steady or even increased in some western regions. Recent increases in VOC and NO x emissions associated with the production of oil and natural gas (O&NG) may contribute to this trend in some areas. The Northern Front Range of Colorado has regularly exceeded O 3 air quality standards during summertime in recent years. This region has VOC emissions from a rapidly developing O&NG basin and low concentrations of biogenic VOC in close proximity to urban-Denver NO x emissions. Here, VOC OH reactivity (OHR), O 3 production efficiency (OPE), and an observationally constrained box model are used to quantify the influence of O&NG emissions on regional summertime O 3 production. Analyses are based on measurements acquired over two summers at a central location within the Northern Front Range that lies between major regional O&NG and urban emission sectors. Observational analyses suggest that mixing obscures any OPE differences in air primarily influenced by O&NG or urban emissions sectors. The box model confirms relatively modest OPE differences that are within the uncertainties of the field observations. Box model results also indicate that maximum O 3 at the measurement location is sensitive to changes in NO x mixing ratio but also responsive to O&NG VOC reductions. Combined, these analyses show that O&NG alkanes contribute over 80% to the observed carbon mixing ratio, roughly 50% to the regional VOC OHR, and approximately 20% to regional photochemical O 3 production.

Print ISSN: 0148-0227

Thema: Geologie und Paläontologie , Physik

Publiziert von Wiley im Namen von American Geophysical Union (AGU).

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Select strengths and biases of models in representing the Arctic winter boundary layer: The Larcform 1 single column model intercomparison (2016)

Felix Pithan, Andrew Ackerman, Wayne M. Angevine, Kerstin Hartung, Luisa Ickes, Maxwell Kelley, Brian Medeiros, Irina Sandu, Gert-Jan Steeneveld, HAM Sterk, Gunilla Svensson, Paul A. Vaillancourt, Ayrton Zadra

Wiley

In: Journal of Advances in Modeling Earth Systems

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Publikationsdatum: 2016-08-04

Beschreibung: Weather and climate models struggle to represent lower tropospheric temperature and moisture profiles and surface fluxes in Arctic winter, partly because they lack or misrepresent physical processes that are specific to high latitudes. Observations have revealed two preferred states of the Arctic winter boundary layer. In the cloudy state, cloud liquid water limits surface radiative cooling, and temperature inversions are weak and elevated. In the radiatively clear state, strong surface radiative cooling leads to the build-up of surface-based temperature inversions. Many large-scale models lack the cloudy state, and some substantially underestimate inversion strength in the clear state. Here, the transformation from a moist to a cold dry air mass is modelled using an idealized Lagrangian perspective. The trajectory includes both boundary layer states, and the single-column experiment is the first L agrangian Arc tic air form ation experiment (Larcform 1) organized within GEWEX GASS (Global atmospheric system studies). The intercomparison reproduces the typical biases of large-scale models: Some models lack the cloudy state of the boundary layer due to the representation of mixed-phase microphysics or to the interaction between micro-and macrophysics. In some models, high emissivities of ice clouds or the lack of an insulating snow layer prevent the build-up of surface-based inversions in the radiatively clear state. Models substantially disagree on the amount of cloud liquid water in the cloudy state and on turbulent heat fluxes under clear skies. Observations of air mass transformations including both boundary layer states would allow for a tighter constraint of model behaviour. This article is protected by copyright. All rights reserved.

Digitale ISSN: 1942-2466

Thema: Geographie , Geologie und Paläontologie

Publiziert von Wiley im Namen von American Geophysical Union (AGU).

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Top-down estimate of methane emissions in California using a mesoscale inverse modeling technique: 1. The South Coast Air Basin (2015)

Yu Yan Cui, Jerome Brioude, Stuart A. McKeen, Wayne M. Angevine, Si-Wan Kim, Gregory J. Frost, Ravan Ahmadov, Jeff Peischl, Nicolas Bousserez, Zhen Liu, Thomas B. Ryerson, Steve C. Wofsy, Gregory W. Santoni, Eric A. Kort, Marc L. Fischer, Michael Trainer

Wiley

In: Journal of Geophysical Research JGR - Atmospheres

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Publikationsdatum: 2015-06-14

Beschreibung: Methane (CH 4 ) is the primary component of natural gas and has a larger global warming potential than CO 2 . Recent top-down studies based on observations showed CH 4 emissions in California's South Coast Air Basin (SoCAB) were greater than those expected from population-apportioned bottom-up state inventories. In this study, we quantify CH 4 emissions with an advanced mesoscale inverse modeling system at a resolution of 8 km × 8 km, using aircraft measurements in the SoCAB during the 2010 CalNex campaign to constrain the inversion. To simulate atmospheric transport, we use the FLEXPART-WRF Lagrangian particle dispersion model driven by three configurations of the Weather Research and Forecasting (WRF) mesoscale model. We determine surface fluxes of CH 4 using a Bayesian least squares method in a 4-dimensional inversion. Simulated CH 4 concentrations with the posterior emission inventory achieve much better correlations with the measurements (R 2 =0.7) than using the prior inventory (US EPA's National Emission Inventory 2005, R 2 =0.5). The emission estimates for CH 4 in the posterior, 46.3 ± 9.2 Mg CH 4 /hr, is consistent with published observation-based estimates. Changes in the spatial distribution of CH 4 emissions in the SoCAB between the prior and posterior inventories are discussed. Missing or underestimated emissions from dairies, the oil/gas system, and landfills in the SoCAB seem to explain the differences between the prior and posterior inventories. We estimate that dairies contributed 5.9 ± 1.7 Mg CH 4 /hr and the two sectors of oil and gas industry (production and downstream) and landfills together contributed 39.6 ± 8.1 Mg CH 4 /hr in the SoCAB.

Print ISSN: 0148-0227

Thema: Geologie und Paläontologie , Physik

Publiziert von Wiley im Namen von American Geophysical Union (AGU).

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