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R. Andrew Nelson
1953
Physics today
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Andrew Nelson, physicist in the geochemistry |
and petrology branch of the Geological Survey, Depart- ment of the Interior at Bethesda, Maryland, died on
May 10 at the age of 48. ...
Nelson was one of the earliest to develop methods of surveying radioactivity from the air as a means of prospecting for uranium. ...
doi:10.1063/1.3061314
fatcat:zdqflgvw5beu7pzoh7zrortvle
: Angels of War . Andrew Pike, Hank Nelson, Gavan Daws
1984
American Anthropologist
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A film by Andrew Pike, Hank Nelson, and Gavan Daws. 54 minutes, color. Purchase $750 (lsmm), $650 (video), rental $75. Also available in short version (34 minutes). ...
One of the producers, Hank Nelson, a historian at the Australian National University, has written extensively about Papua New Guinea. ...
doi:10.1525/aa.1984.86.2.02a01110
fatcat:jlz6mbiqjjgflcklk4s663slei
Nelson Spencer (1918–2002)
2003
EOS
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For the individual Nelson Spencer PAGE 82 Nelson Spencer, former chief of the Laboratory for Atmospheres at NASA/Goddard Space Flight Center, died on 31 August 2002 in Bethesda, Maryland, at the age of ...
He received the Michigan Fron tiersman Award in 1960,
- LARRY BRACE, GEORGE CARIGNAN,TOM DONAHUE, AND ANDREW NAGY, University of Michigan, Ann Arbor; AND DONALD HUNTEN, University of Arizona,Springer ...
doi:10.1029/2003eo090008
fatcat:lgrtb4hcmbdgbh6xf2vac6j2ja
Towards Understanding Jovian Planet Migration
[article]
1999
arXiv
pre-print
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Initial conditions The PPM code and initial conditions are very similar to those presented in Nelson et al. 1998 . We begin with a one M ⊙ protostar fixed to the origin of our coordinate system. ...
arXiv:astro-ph/9908147v1
fatcat:miluzqkcd5atpbenykrwpkgnme
A trans-acting long non-coding RNA represses flowering in Arabidopsis
[article]
2021
bioRxiv
pre-print
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Eukaryotic genomes give rise to thousands of long non-coding RNAs (lncRNAs), yet the purpose of lncRNAs remains largely enigmatic. Functional characterization of lncRNAs is challenging due to multiple orthogonal hypothesis for molecular activities of lncRNA loci. Here, we identified a flowering associated intergenic lncRNA (FLAIL) that represses flowering in Arabidopsis. An allelic series of flail loss-of-function mutants generated by CRISPR/Cas9 and T-DNA mutagenesis showed an early flowering
doi:10.1101/2021.11.15.468639
fatcat:qmsgwkrnznc2be3jyohxbewyni
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... henotype. Gene expression analyses in flail mutants revealed differentially expressed genes linked to the regulation of flowering. A genomic rescue fragment of FLAIL introduced in flail mutants complemented gene expression defects and early flowering, consistent with trans-acting effects of the FLAIL RNA. Knock-down of FLAIL RNA levels using the artificial microRNA approach revealed an early flowering phenotype shared with genomic mutations, indicating a trans-acting role of FLAIL RNA in the repression of flowering time. Genome-wide detection of FLAIL-DNA interactions by ChIRP-seq suggested that FLAIL may directly bind genomic regions. FLAIL bound to genes involved in regulation of flowering that were differentially expressed in flail, consistent with the interpretation of FLAIL as a trans-acting lncRNA directly shaping gene expression. Our findings highlight FLAIL as a trans-acting lncRNA that affects flowering in Arabidopsis, likely through mediating transcriptional regulation of genes directly bound by FLAIL.
Dynamics and Observational Appearance of Circumstellar Disks
[article]
1999
arXiv
pre-print
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DYNAMICS AND OBSERVATIONAL APPEARANCE OF CIRCUMSTELLAR DISKS by
Andrew Frederick Nelson
A Dissertation Submitted to the Faculty of the
DEPARTMENT OF PHYSICS
In Partial Fulfillment of the Requirements ...
My parents, Jim and Judy Nelson. My sister Margot and her husband Jeff. And my brother, Charlie. Hopefully someday soon there will be other additions. ...
arXiv:astro-ph/9908158v1
fatcat:navsv4sikranhbk3f4np5novgu
Nelson, Andrew, Alexander Rödlach, and Roos Willems (eds.): The Crux of Refugee Resettlement. Rebuilding Social Networks. Lanham: Lexington Books, 2019. 299 pp. ISBN 978-1-4985-8889-8. Price: $ 115.00
2021
Anthropos: Internationale Zeitschrift für Völker- und Sprachenkunde
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Nelson points out that providing refugees with very short-term economic support pushes them into low-skilled, low-paid jobs and limits their access to language learning and other training and education ...
These chapters (Nelson, Lumley-Sapanski, and Stadler) provide fascinating insight into the way different refugee communities mobilise their capital (cultural, personal and social) to achieve different ...
doi:10.5771/0257-9774-2021-1-263
fatcat:5i4kb2fpcfctphttkwui4rnu2m
A Resolution Requirement for Disk Simulations Modeling Collapse
[article]
2003
arXiv
pre-print
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The statement that the physical model in Nelson et al. was insufficient is certainly valid (see e.g. Nelson et al. 2000) . ...
Bate & Burkert (1997) arrived at a similar result for particle simulations: numerical instability could be suppressed by resolving Nelson Figure 1 . ...
arXiv:astro-ph/0301600v1
fatcat:fcyrcasc6jbjpnrfxr3cd4mldi
Gravitational instability in binary protoplanetary disks
[article]
2007
arXiv
pre-print
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Numerical resolution Nelson (2000) smaller than that in Nelson (2000) in overdense regions forming during the simulation. ...
Fig. 10 . 10 Temperature profiles of the disks in Nelson ...
arXiv:0705.3182v1
fatcat:jx5bp7jgqzhzjpgwyoywexs57i
A simple-rapid method to separate uranium, thorium, and protactinium for U-series age-dating of materials
2014
Journal of Environmental Radioactivity
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Uranium-series dating techniques require the isolation of radionuclides in high yields and in fractions free of impurities. Within this context, we describe a novel-rapid method for the separation and purification of U, Th, and Pa. The method takes advantage of differences in the chemistry of U, Th, and Pa, utilizing a commercially-available extraction chromatographic resin (TEVA) and standard reagents. The elution behavior of U, Th, and Pa were optimized using liquid scintillation counting
doi:10.1016/j.jenvrad.2014.02.010
pmid:24681438
pmcid:PMC5538884
fatcat:pfswpvyb2zdc7oygtejb5cpzcm
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... niques and fractional purity was evaluated by alpha-spectrometry. The overall method was further assessed by isotope dilution alpha-spectrometry for the preliminary age determination of an ancient carbonate sample obtained from the Lake Bonneville site in western Utah (United States). Preliminary evaluations of the method produced elemental purity of greater than 99.99% and radiochemical recoveries exceeding 90% for U and Th and 85% for Pa. Excellent purity and yields (76% for U, 96% for Th and 55% for Pa) were also obtained for the analysis of the carbonate samples and the preliminary Pa and Th ages of about 39,000 years before present are consistent with 14 C-derived age of the material.
A radical approach to diverse meroterpenoids
2020
Nature Chemistry
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A radical approach to diverse meroterpenoids Andrew Gomm and Adam Nelson* School of Chemistry and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, LS2 9JT, UK *Email: a.s.nelson ...
doi:10.1038/s41557-019-0414-7
pmid:31959961
fatcat:zxptnyuu7be27lqlikj7ltlrnu
Microbial range expansions on liquid substrates
[article]
2018
arXiv
pre-print
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Despite the importance that fluid flow plays in transporting and organizing populations, few laboratory systems exist to systematically investigate the impact of advection on their spatial evolutionary dynamics. To address this problem, we study the morphology and genetic spatial structure of microbial colonies growing on the surface of a nutrient-laden fluid 10^4 to 10^5 times more viscous than water in Petri dishes, the extreme but finite viscosity inhibits undesired thermal convection and
arXiv:1812.09797v1
fatcat:clb5lvcf4zag7djjn6cj5yfsni
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... ows populations to effectively live at the air-liquid interface due to capillary forces. We discover that S. cerevisiae (baker's yeast) growing on a viscous liquid behave like "active matter": they metabolically generate fluid flows many times larger than their unperturbed colony expansion speed, and that flow, in return, can dramatically impact their colony morphology and spatial population genetics. We show that yeast cells generate fluid flows by consuming surrounding nutrients and decreasing the local substrate density, leading to misaligned fluid pressure and density contours, which ultimately generates vorticity via a thresholdless baroclinic instability. Numerical simulations demonstrate that an intense vortex ring is produced below the colony's edge and quantitatively predict the observed flow. As the viscosity of the substrate is lowered and the self-induced flow intensifies, we observe three distinct morphologies: at the highest viscosity,compact circular colonies similar to those grown on hard agar plates except with a stretched regime of exponential expansion, intermediate viscosities give rise to compact colonies with "fingers" that are ripped away to break into smaller cell clusters, and at the lowest viscosity, the expanding colony breaks up into many genetically-diverse, mutually repelling, island-like fragments of yeast colonies.
Evolutionary and biochemical analyses reveal conservation of the Brassicaceae telomerase ribonucleoprotein complex
[article]
2019
bioRxiv
pre-print
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TRAP was performed as described fragment (TRF) length analyses were performed as described in Nelson et al. (2014) . In brief, Fig 3 ; 3 S2 Figure). ...
doi:10.1101/760785
fatcat:74buwbxxh5c2tjasrwgyxnuaw4
Spatially-constrained growth enhances conversional meltdown
[article]
2015
bioRxiv
pre-print
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Cells that mutate or commit to a specialized function (differentiate) often undergo conversions that are effectively irreversible. Slowed growth of converted cells can act as a form of selection, balancing unidirectional conversion to maintain both cell types at a steady-state ratio. However, when one-way conversion is insufficiently counterbalanced by selection, the original cell type will ultimately be lost, often with negative impacts on the population's overall fitness. The critical balance
doi:10.1101/027292
fatcat:k63jjqddfrfvpahdpsalzrtyya
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... between selection and conversion needed for preservation of unconverted cells and the steady-state ratio between cell types depends on the spatial circumstances under which cells proliferate. We present experimental data on a yeast strain engineered to undergo irreversible conversion: this synthetic system permits cell type-specific fluorescent labeling and exogenous variation of the relative growth and conversion rates. We find that populations confined to grow on a flat agar surface are more susceptible than their well-mixed counterparts to fitness loss via a conversion-induced "meltdown." We then present analytical predictions for growth in several biologically-relevant geometries -- well-mixed liquid media, radially-expanding two-dimensional colonies, and linear fronts in two dimensions -- by employing analogies to the directed percolation transition from non-equilibrium statistical physics. These simplified theories are consistent with the experimental results.
Aggregate Selection in Evolutionary Robotics
[chapter]
2007
Studies in Computational Intelligence
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