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  • 1985-1989  (4)
  • 1980-1984  (3)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Ion temperature measurements on JT-60 using He beam scattering (invited) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1652-1657 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In order to measure the ion temperature of the JT-60 tokamak, we have developed a Rutherford scattering system using a helium atom beam. A positive-ion beam generated by an ion source which has a capability of beam energy 200 keV and drain current 3.5 A is converted to a helium atom beam by collision with cold helium gas. The He atom beam, equivalent to 0.6 A, reaches the center of the vacuum chamber of the JT-60 tokamak. The scattering angle is 7.0°. Scattered helium atoms are analyzed by an E(parallel)B-type neutral particle energy analyzer with a gas stripping cell. This scattering system has been applied to investigate additionally heated plasmas by the method of neutral beam injection (NBI), ion cyclotron wave (ICRH), lower hybrid wave (LHRH), and combined heating of NBI+LHRH or ICRH in a parameter range of Bt=4.0 to 4.5 T, Ip=1.0 to 3.2 MA, and n¯e(approximately-less-than)1×1020 m−3. The ion temperatures obtained by the system are consistent with those measured by Doppler broadenings of Ti xxi and Ti xxii resonance lines. To investigate the influence of ion temperature and density profiles and the beam component of NBI heating on the determination of ion temperature, we have evaluated an energy spectrum of scattered atoms by using a simulation code. The result shows that in JT-60 plasmas the beam component hardly exerts an important influence on the determination of ion temperature by this diagnostic system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140124
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of M protein of influenza B virus is specifically inhibited at a non-permissive temperature (1982)
    Springer
    Archives of virology 73 (1982), S. 199-204 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Growth of influenza B viruses is restricted at high temperatures. Within B/Yamagata-infected MDCK cells, the synthesis of the M protein was selectively inhibited at 39° C, accompanied by a reduced production of virus particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01314728
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Comparison of nine strains of influenza C virus in growth characteristics and viral polypeptides (1984)
    Springer
    Archives of virology 82 (1984), S. 111-117 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Nine strains of influenza C virus were compared in their growth characteristics and viral polypeptides using LLCMK2 cells. The results suggested that influenza C virus undergoes genetic changes like influenza A or B virus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01309374
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Biological functions of the NS1 protein of an influenza B virus mutant which has a long carboxyl terminal deletion (1988)
    Springer
    Archives of virology 102 (1988), S. 173-185 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To clarify the function of the NS gene of a highly cytolytic mutant of influenza virus B/Yamagata/1/73 which expresses an NS1 protein with a long carboxyl terminal deletion (clone 201), we prepared a single gene reassortant (201 L-77) and a control reassortant (YL-20) in which all the genes were of wild type influenza virus B/Lee/40 origin except NS gene which was derived from either clone 201 or wild type B/Yamagata. Comparative studies have revealed that 201 L-77 destructed infected cells more severely and much earlier after infection than did YL-20, although both produced comparable amount of infectious virus. The highly cytolytic reassortant 201 L-77 produced a small plaque, while the weakly cytolytic reassortant YL-20 produced a large plaque in MDCK cells. There was little difference between the two reassortants in the time course and the amount of synthesis of viral proteins within the infected cells. However, the mode of synthesis of viral RNA (vRNA) by 201 L-77 was greatly altered compared with YL-20.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01310823
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Comparison of protective effects of serum antibody on respiratory and systemic infection of Sendai virus in mice (1989)
    Springer
    Archives of virology 107 (1989), S. 85-96 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The protective effects of the passive administration of convalescent serum from mice infected with Sendai virus were evaluated in mice challenged intranasally with wild-type and a pantropic variant (F1-R) of Sendai virus. Adoptive transfer of the serum efficiently prevented F1-R from infecting the systemic organs, but it failed to protect the mice from infections of the respiratory tracts by either virus. Virus replication in nasal turbinates was not diminished while infection in the lung was suppressed sufficiently for the infected mice to survive the infection. These findings suggest that serum antibody is less effective for the protection against viral infections on the surface of the respiratory tract, but it is effective for inhibition of spread of the virus into the systemic organs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313881
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  • 6
    Electronic Resource
    Electronic Resource
    Temperature-sensitive influenza A virus clones originated by a cross between A/Aichi/2/68 (H3N2) and B/Yamagata/1/73 (1983)
    Springer
    Archives of virology 75 (1983), S. 17-27 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A genetic cross was performed between influenza viruses B/Yamagata/1/73 and clone 6–10, an A type influenza virus derived from a cross between A/Aichi/2/68 (H3N2) and B/Yamagata. Efficiency of plating of B/Yamagata at 39.5° C was less than 10−3 in MDCK cells, while that of clone 6–10 or A/Aichi was higher than 10−1. Four of the 15 clones selected for HA of Aichi serotype from the mixed yield, where type B virus was predominant over type A, were temperature-sensitive(ts), with efficiency of plating at 39.5° C less than 10−2, exceeding the frequency of spontaneousts mutants among clone 6–10 progeny. Thus, co-existing type B virus not only interfered with the replication of type A, but also rendered it temperature-sensitive. Genetic analysis of the 4ts clones using a set ofts mutants of influenza virus A/WSN (H0N1) revealed that these clones, in contrast with the spontaneousts mutant of clone 6–10, withts defect only in NP gene, possessedts lesions in multiple genes including a commonts defect inm. Polyacrylamide gel electrophoresis of viral RNA and proteins of these clones showed an identical gel pattern to that of clone 6–10, although the rate of synthesis of individual viral polypeptide was variable from clone to clone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01314124
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  • 7
    Electronic Resource
    Electronic Resource
    Isolation of a novel type of interfering influenza B virus defective in the function of M gene (1986)
    Springer
    Archives of virology 90 (1986), S. 223-236 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A novel type of interfering influenza B virus which is defective in the function of M gene has been reported. Clone 301, a B type virus clone obtained by successive back-crosses of A/Aichi/2/68 (H 3 N 2) with B/Yamagata/1/73, grew normally in MDCK cells when inoculated at a low multiplicity, but was easily converted to a hemagglutinating but non-infectious form by one cycle of high multiplicity infection. Within MDCK cells infected with infectious clone 301 at a high multiplicity, synthesis of M protein was greatly reduced. The virus particle produced by a high multiplicity infection was devoid of RNA segment 7 (M gene), contained less amount of M protein compared with the standard virus, and interfered with the replication of wild type B/Yamagata, again accompanied by a selective suppression of M protein synthesis within the co-infected cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01317372
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    Paper (German National Licenses)
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