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  • 1
    Electronic Resource
    Electronic Resource
    Infectious haematopoietic necrosis virus from salmonids cultured in Korea (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 16 (1993), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract. Four isolates of infectious haematopoietic necrosis virus (IHNV) were obtained from rainbow trout, Oncorhynchus mykiss (Walbaum), and masu salmon, Oncorhynchus masou (Walbaum), fry during epizootics at hatcheries in Korea. The four isolates of IHNV were compared with three from salmonids in the USA (SRCV, OSV and RB-76) by analysis of virion proteins in sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE) and neutralization tests, with two monoclonal antibodies raised against SRCV (MAb SRCV/A4) and RB-76 (MAb RB/B5). Based on the antigenicity and the size of the structural proteins, one Korean isolate from masu salmon (SCS) is similar to RB-76 and is an electropherotype 1. The other three isolates from rainbow trout (PRT, YRT and MRT) were identical to each other in the mobilities of their virion proteins in SDS-PAGE, and although their nucleocapsid (N) proteins comigrated with that of the RB-76 isolate, they differed from RB-76 in the smaller matrix 2 (M2) protein they contained. In addition, the three Korean isolates (PRT, YRT and MRT) could be divided into two groups by reactivity with MAb RB/B5. While the YRT isolate was neutralized by this MAb, the PRT and MRT isolates were not, suggesting that there are at least two neutralizing antigenic variants of IHNV in Korea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1993.tb00880.x
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  • 2
    Electronic Resource
    Electronic Resource
    Coincidence counting for the study of hydrocarbon ion desorption in plasma desorption mass spectrometry (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 3206-3210 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Abstract-coincidence counting techniques have been used in conjunction with time-of-flight mass spectrometry (TOF-MS) to study the impact of MeV/amu ions on surfaces. Several samples were studied including Au metal and a series of polymers. The results are consistent with a Coulomb explosion model for the secondary ion desorption in plasma desorption mass spectrometry. Correlations were observed between the emission of H+ and the emission of certain hydrocarbon ions from the polymer samples. These correlations indicate a chemical relation in the formation of H+ and other hydrocarbon ions and imply that low mass hydrocarbon ions are formed close to the center of the impact site during the collision of primary ion with the sample. Also, we have shown that the coincidence data contains information about the structure of the samples and that with coincidence counting, an estimate of the yield of secondary ions can be obtained without knowledge of how many primary ions strike the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461964
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  • 3
    Electronic Resource
    Electronic Resource
    A coincidence counting study of polyatomic ion induced sputtering (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 8171-8176 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Coincidence counting methods were used to examine the desorption of secondary ions from a CsI surface via keV atomic and polyatomic projectile impacts. A correlation between the emission of I− and CsI−2 secondary ions was attributed to the common chemical origin of the ions. The degree to which I− and CsI−2 were correlated was observed to change as a function of the kinetic energy and complexity of the primary ion as well as the yield of I−. This is attributed to a change in the relative importance of competing ion formation processes as a function of the energy in the desorption site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462321
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  • 4
    Electronic Resource
    Electronic Resource
    A spontaneous desorption-based polyatomic ion source (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 1748-1753 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe an ion source based on the spontaneous desorption process. The production, acceleration, and separation processes allow for the production of keV energy polyatomic ions while maintaining a high signal-to-background ratio. Both atomic and polyatomic ions with up to 37 keV energy were generated. Because the spontaneous desorption process is naturally pulsed, the ion source was attached to a dual time-of-flight mass spectrometer for secondary ion mass spectrometry experiments. In this article, we describe the design of both the polyatomic ion source and the mass spectrometer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144004
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  • 5
    Electronic Resource
    Electronic Resource
    Fragment ion formation from n-alkanes and cycloalkanes by plasma desorption (1994)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 29 (1994), S. 679-683 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The plasma desorption of hydrogen loss fragment ions from frozen films of several classes of aliphatic volatile hydrocarbons was investigated with 252Cf plasma desorption mass spectrometry. A time-of-flight instrument suitable for the reproducible sampling and analysis of volatile hydrocarbons in the solid state was designed for this study. Representative compounds from the n-alkanes and cycloalkanes were analyzed. For all the compounds studied, radical molecular ions. M+., and hydrogen loss fragment ions, [M — mH]+ with m varying from 1 to 10, were produced. The length of the alkane chain, the size of the alkane rings and the stability of the resulting H-loss ions affected the number and abundance of these ions. Smaller molecules underwent proportionally more hydrogen loss than larger molecules of the same class.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210291117
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