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  • 1
    ISSN: 1573-4978
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Yeast tRNAPhe has been labelled with 125I under conditions which conserve the tertiary structure. Significant labelling was only found to occur on specific cytidines in single stranded regions, while other cytidines in single stranded regions and all those in the double stranded region underwent iodination to a very small extent. The pattern obtained from iodine labelling satisfies the conformation of a model recently proposed for this tRNA.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-072X
    Keywords: Cyanobacteria ; Phycobiliproteins ; Allophycocyanins ; Hybrid proteins ; Immunology ; Protein evolution ; Cyanidium caldurium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Allophycocyanins were purified from diverse cyanobacteria and one rhodophytan alga (Cyanidium caldarium). The native proteins are trimeric molecules with the structure (αβ)3. Representative native allophycocyanins and their α and β subunits were characterized with respect to molecular weight, amino acid composition, isoelectric point, absorption and fluorescence spectra and immunological properties. All of the allophycocyanins studied were strikingly similar with respect to each of these properties. Renatured α and β subunits of allophycocyanin were distinct immunologically from each other, and both cross-reacted with the antiserum to the native protein. Trimeric allophycocyanin was readily reconstituted from the purified α and β subunits. Formation of hybrid allophycocyanins was demonstrated by direct isolation and characterization of the hybrid proteins and by immunological techniques. The results support the view that allophycocyanins are a highly conserved group of proteins.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 45 (1978), S. 93-95 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Design and operation of a new sampler for zooplankton are described. The sampler facilitates reliable duplicate samples; it can be closed at a defined depth during vertical towing, and can be rapidly reloaded for repeated tows.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2019-07-27
    Description: A 128 x 128 element CID imager was operated in a simulated stellar trackling environment and evaluated for temporal and pattern noise and spectral response over a temperature range of -40 C to +25 C. The test devices were fabricated on long-lifetime bulk silicon material and utilized very thin upper-level polysilicon electrodes for enhanced spectral response. A standard microcomputer was used to generate all control signals and to collect and process performance data. The results of this program were used to predict the performance of a 400 x 400 CID array designed specifically for stellar-tracking.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Recent advances in TV sensors and systems; August 27, 28, 1979; San Diego, CA
    Format: text
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  • 5
    Publication Date: 2016-06-07
    Description: Readout of CID imaging arrays was first performed by injecting and detecting the signal charge from each sensing site in sequence. A new readout method, termed parallel injection, has been developed in which the functions of signal charge detection and injection have been separated. The level of signal charge at each sensing site is detected during a line scan, and during the line retrace interval, all charge in the selected line is injected. The parallel injection technique is well adapted to TV scan formats in that the signal is read out at high speed, line by line. A 244 line by 248 element TV compatible imager, employing this technique and including an on chip preamplifier, has been constructed and operation demonstrated.
    Keywords: OPTICS
    Type: JPL Proc.: Symp. on Charge-Coupled Device Technol. for Sci. Imaging Appl.; p 106-115
    Format: application/pdf
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  • 6
    Publication Date: 2019-06-27
    Description: The author has identified the following significant results. First order benefits can generally be quantified, thus allowing quantitative comparisons of candidate land cover data systems. A meaningful dollar evaluation of LANDSAT can be made by a cost comparison with equally effective data systems. Users of LANDSAT data can be usefully categorized as performing three general functions: planning, permitting, and enforcing. The value of LANDSAT data to the State of Georgia is most sensitive to the parameters: discount rate, digitization cost, and photo acquisition cost. Under a constrained budget, LANDSAT could provide digitized land cover information roughly seven times more frequently than could otherwise be obtained. Thus on one hand, while the services derived from LANDSAT data in comparison to the baseline system has a positive net present value, on the other hand if the budget were constrained, more frequent information could be provided using the LANDSAT system than otherwise be obtained.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E78-10076 , NASA-CR-151615
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