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  • EARTH RESOURCES AND REMOTE SENSING  (2)
  • Analytical Chemistry and Spectroscopy  (1)
  • Ni(II)  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular evolution 18 (1982), S. 137-143 
    ISSN: 1432-1432
    Keywords: Ni(II) ; Nucleotides ; Nucleosides ; Purine Purine bases ; Chemical evolution ; Binary complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The interactions of Ni(II) cation with a representative suite of purine bases and the respective nucleosides and nucleotides have been studied by ultraviolet difference spectroscopy. Apparent association constants, Kapp, were determined for each system at pH 7.0, using computer linear regression coupled with an iteration technique. The specificity of binding of Ni2+ for the purine nucleotides studied at pH 7.0 was 5′-GMP 〉 5′-IMP 〉 5′-AMP; a similiar ordering was also found for the respective nucleosides and bases. In this study binding was not observed for the suite of pyramidines used, although a Ni2+ - cytidine complex has been observed (Fiskin and Beer, 1965). It was also found that Ni2+ bound more strongly to the purine 5′-nucleotides than to the respective nucleosides and bases. These trends are explained in terms of metal-ligand bonds and available bonding positions on the ligands. A role for metal-ion-nucleotide types of complexes is suggested in the processes that might have given rise to the origin of life.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 11 (1976), S. 1158-1167 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Semi-empirical molecular orbital calculations have been used to study the substituent effect on the intensity of the m/e 43 peak ([COCH3]+) in the mass spectra of a series of 25 substituted acetophenones. The two most relevant molecular properties calculated appear to be the ionization potential and the bond density of the fragmenting bond. A semi-logarithmic plot of relative peak intensities[the ratio of m/e (43/[M]+)] versus the ratio of ionization potential to bond density for these compounds produced a linear relationship with a correlation coefficient of 0.90 from the INDO method and 0.93 from the IEHT method. The use of two different semi-empirical methods to calculate ionization potentials and bond densities, together with the qualitative agreement between the two methods and with available experimental data, substantiates the correlations obtained. In addition, the molecular orbital calculations were used to understand the anomalous behavior of the teritary butyl and para-phenyl substitutes.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 2011-08-24
    Description: A remote sensing, medical satellite (MEDSAT) aids in the control of carrier (vector) borne disease. The prototype design is a light satellite to test for control of malaria. The design features a 340-kg satellite with visual/IR and SAR sensors in a low inclination orbit observing a number of worldwide test sites. The approach is to use four-band visual/IR and dual-polarized L-band SAR images obtained from MEDSAT in concert with in-situ data to estimate the temporal and spatial variations of malaria risk. This allows public health resources to focus on the most vulnerable areas at the appropriate time. It is concluded that a light-satellite design for a MEDSAT satellite with a Pegasus launch is feasible.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: In: IGARSS '92; Proceedings of the 12th Annual International Geoscience and Remote Sensing Symposium, Houston, TX, May 26-29, 1992. Vol. 1 (A93-47551 20-43); p. 28-30.
    Format: text
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  • 4
    Publication Date: 2019-01-25
    Description: Since its inception three years ago, the Land Processes Aircraft Science Management Operations Working Group (MOWG) provided recommendations on the optimal use of the Agency's aircraft in support of the Land Processes Science Program. Recommendations covered topics such as aircraft and sensor usage, development of long-range plans, Multisensor Airborne Campaigns (MAC), program balance, aircraft sensor databases, new technology and sensor development, and increased University scientist participation in the program. Impacts of these recommendations improved the efficiency of various procedures including the flight request process, tracking of flight hours, and aircraft usage. The group also created a bibliography focused on publications produced by Land Processes scientists from the use of the aircraft program, surveyed NASA funded PI's on their participation in the aircraft program, and developed a planning template for multi-sensor airborne campaigns. Benefits from these activities are summarized.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA, Washington, 4th Airborne Geoscience Workshop; p 201
    Format: text
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