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  • Lunar and Planetary Science and Exploration  (6)
  • *Gene Expression
  • Optics
  • 2005-2009  (3)
  • 2000-2004  (5)
  • 2006  (3)
  • 2002  (5)
  • 1
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    Gene expression during the life cycle of Drosophila melanogaster (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-09-28
    Description: Molecular genetic studies of Drosophila melanogaster have led to profound advances in understanding the regulation of development. Here we report gene expression patterns for nearly one-third of all Drosophila genes during a complete time course of development. Mutations that eliminate eye or germline tissue were used to further analyze tissue-specific gene expression programs. These studies define major characteristics of the transcriptional programs that underlie the life cycle, compare development in males and females, and show that large-scale gene expression data collected from whole animals can be used to identify genes expressed in particular tissues and organs or genes involved in specific biological and biochemical processes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Arbeitman, Michelle N -- Furlong, Eileen E M -- Imam, Farhad -- Johnson, Eric -- Null, Brian H -- Baker, Bruce S -- Krasnow, Mark A -- Scott, Matthew P -- Davis, Ronald W -- White, Kevin P -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2002 Sep 27;297(5590):2270-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Sciences, Stanford University, Stanford, CA 94305, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12351791" target="_blank"〉PubMed〈/a〉
    Keywords: Algorithms ; Animals ; Cluster Analysis ; Drosophila Proteins/genetics/physiology ; Drosophila melanogaster/embryology/*genetics/*growth & development ; Embryo, Nonmammalian/physiology ; Female ; *Gene Expression ; Gene Expression Profiling ; Gene Expression Regulation, Developmental ; *Genes, Insect ; Germ Cells/physiology ; Larva/genetics ; Life Cycle Stages/*genetics ; Male ; Oligonucleotide Array Sequence Analysis ; Organ Specificity ; Pupa/genetics ; RNA, Messenger/genetics/metabolism ; Sex Characteristics ; Transcription, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Dynamic testing techniques for qualifying Mars Eploration Rover equipment to quasi-static landing loads (2002)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: In mid 2003, NASA will launch identical spacecraft to deliver two large rovers to the Martian surface. As with the successful Mars Pathfinder (MPF) mission, the MER spacecraft will use an airbag landing system to safely deliver its payload.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Fourth International Conference on Computational Stochastic Mechanics; Corfu; Greece
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  • 3
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    ISO far-infrared spectroscopic observations of Jupiter (2002)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: We present the far-infrared spectrum of Jupiter that was measured with the Short and Long Wavelength Spectrometers aboard the Infrared Space Observatory.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Jupiter After Galileo and Cassini -- A Conference About the Giant Planets; Lisbon; Portugal
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    NASA TECHNICAL REPORTS
  • 4
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    Fe Isotopic Composition of Presolar SiC Mainstream Grains (2002)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Iron isotopic distribution was measured in SiC mainstream grains from the Murchison meteorite by time-of-flight resonance ionization mass spectrometry. All grains exhibit 54Fe depletions of 50 to 200, lower than what are predicted by calculations of s-process nucleosynthesis in AGB stars. Additional information is contained in the original extended abstract.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXIII; LPI-Contrib-1109
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  • 5
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    Isotopic Composition of Barium in Single Presolar Silicon Carbide Grains (2002)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: We have measured Ba isotope distributions in individual presolar SiC grains. We find that the Ba isotopic composition in mainstream SiC grains is consistent with models of nucleosynthesis in low to intermediate mass asymptotic giant branch (AGB) stars. Additional information is contained in the original extended abstract.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXIII; LPI-Contrib-1109
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  • 6
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    A New Model for Water Vapor/Ice Abundance in a Protoplanetary Nebula (2006)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: Water is a unique substance in the protoplanetary nebula since both solid and gaseous phases coexist in large quantities. Quantitative estimates of their relative abundances are important parameters regarding the physical state of the nebula and planet formation processes. This new model is based on computing the chemical evolution of water molecules until its partial pressure is sufficient to pierce the vapor pressure curve for water. The point at which this occurs relative to its steady state values determines final gas/ice ratios. The wide range of temperatures and densities in typical protoplanetary disks result in a range of gadice ratios. It is found that although ice dominates the mid and far nebula, water vapor is predominant in the centerplane region of the near nebula and above the disk photosphere. An interesting near nebula effect is the appearance of a cloud of water ice at the temperature inversion elevation surrounded by vapor above and below. This work is partially supported by the NASA Astrobiology Institute.
    Keywords: Lunar and Planetary Science and Exploration
    Type: 2006 DPS Meeting; Oct 08, 2006 - Oct 13, 2006; Pasadena, CA; United States
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  • 7
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    Remote Collaboration on Task Scheduling for Humans at Mars (2006)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: As humans venture farther from Earth for longer durations, it will become essential for those on the journey to have significant control over the scheduling of their own activities as well as the activities of their companion systems and robots. However, the crew will not do all the scheduling; timelines will be the result of collaboration with ground personnel. Emerging technologies such as in-space message buses, delay-tolerant networks, and in-space internet will be the carriers on which the collaboration rides. Advances in scheduling technology, in the areas of task modeling, scheduling engines, and user interfaces will allow the crew to become virtual scheduling experts. New concepts of operations for producing the timeline will allow the crew and the ground support to collaborate while providing safeguards to ensure that the mission will be effectively accomplished without endangering the systems or personnel.
    Keywords: Lunar and Planetary Science and Exploration
    Type: IEEEAC Paper 1415 , IEEE Aerospace Conference 2007; Mar 03, 2007 - Mar 10, 2007; Big Sky, MT; United States
    Format: application/pdf
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  • 8
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    Use of Photoelastic Modulators for High-accuracy Spectropolarimetric Imaging of Aerosols (2006)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Passive multiangular, multispectral, and polarimetric sensing approaches each have unique strengths for the measurement of tropospheric aerosol column abundances and microphysical properties. Current spaceborne multispectral and multiangular aerosols sensors operate at approximately 1 km resolution. Under NASA's Instrument Incubator Program, we are developing an electro-optic imaging approach that will enable adding high-accuracy polarimetry to such observations. To achieve a degree of linear polarization (DOLP) uncertainty of 0.5%, our approach temporally modulates the linear-polarization component of incoming light at a rapid rate, enabling each detector within a focal-plane array, combined with polarization analyzers, to measure the relative proportions of the linear Stokes components Q or U to the total intensity. Our system uses tandem photoelastic modulators (PEMs) within a high-reflectance, low diattenuation camera design. The two PEMs vibrate at slightly different resonant frequencies, leading to modulation of the polarized light at a heterodyne frequency of ~25 Hz. High-speed (1 kHz) readout of the detector arrays samples the output waveforms from which Q/I and U/I are derived. We report on experimental and theoretical analyses of PEM and optical system performance, along with plans for developing ruggedized PEMs capable of withstanding launch and on-orbit stresses.
    Keywords: Optics
    Type: 2006 Earth Science Technology Conference (ESTC-06)2006; Jun 26, 2006; College Park, MD; United States
    Format: text
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