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  • Articles  (6)
  • 2000-2004  (1)
  • 1985-1989  (2)
  • 1975-1979  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Aquatic ecology 10 (1976), S. 37-39 
    ISSN: 1573-5125
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 97 (1978), S. 275-290 
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The meiospore ofPhysoderma maydis (Phycomycetes, Chytridiales, Physodermataceae) has a nuclear cap enclosing the cellular ribosomes within a double membrane, and double membranes traversing the nuclear cap. Aggregates of ribosomes not incorporated into the nuclear cap are also enclosed by double membranes. A vesicular network is observed in the anterior portion of the spore in direct connection with the nuclear cap membrane and with a stacked parallel array of membranes, which itself is connected with the nuclear cap membrane. The meiospore ofP. maydis contains a side body complex of the type observed in spores of theBlastocladiales. Vesicles enclose the side body complex and these vesicles are connected to the nuclear cap membrane and the nuclear envelope, and form a network which partially encloses the kinetosomal apparatus. The nuclear cap membrane, stacked array of membranes, and the vesicles which surround the side body complex and the kinetosomal apparatus contain an electron-dense amorphous material. On the basis of their ultrastructural appearance, these membranes are interpreted as part of a highly divided microbody. The ultrastructural organization of the meiospore ofP. maydis is compared to the structural organization observed in spores of theChytridiales, Blastocladiales, Monoblepharidales, andHarpochytriales. It is concluded that the structural organization of the meiospores ofP. maydis is the same as observed for members of theBlastocladiales, and it is suggested that thePhysodermataceae should be transferred from theChytridiales to theBlastocladiales.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The zoospore and meiospore of the aquatic phycomyceteCatenaria anguillulae (Phycomycetes, Blastocladiales, Catenariaceae) have a nuclear cap enclosing the cellular ribosomes within a double membrane, and a side body complex which is very similar to that observed in zoospores ofBlastocladiella andCoelomomyces and is structurally related to the side body complex observed in spores ofAllomyces. The structural organization of the side body complex and striated rootlet is analyzed from serial sections. The meiospore also contains an array of flattened cisternae which are in direct contact with, and appear to be derived from, the outer nuclear membrane and the backing membrane of the side body complex. The structural organization of the zoospore and meiospore ofC. anguillulae is compared to and contrasted with the structural organization observed in spores of members of theChytridiales, Blastocladiales, Monoblepharidales, andHarpochytriales. It is concluded that the structural organization of the spores of theBlastocladiales, Monoblepharidales, andHarpochytriales is similar, and affinities in spore organization can be found in some members of theChytridiales.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The paramyxovirus SV5 was originally detected in monkey tissues6 and has never been associated with any human disease. It has been isolated from a number of human sources7'8, however, including the bone marrows of multiple sclerosis (MS) patients9'10. Subsequent studies, using monoclonal ...
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  • 5
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Systemic administration of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) caused a rapid and long-lasting reduction of both 3,4-dihydroxyphenylalanine (dopamine, DA) and noradrenaline (NA) in mouse brain, as observed histo- and neurochemically. The depleting effects were more pronounced after repeated MPTP administration and the most marked reductions were observed after 2 × 50 mg MPTP/kg s.c., when DA in striatum and NA in frontal cortex were reduced by 〉 90% 1 week after MPTP. Mice with such catecholamine depletions were markedly sedated and almost completely immobilized. The behavioural syndrome after MPTP resembled that seen after reserpine, a monoamine-depleting drug. MPTP also caused a long-lasting reduction of catecholamine uptake in striatal DA and cortical NA nerve terminals and reduced tyrosine hydroxylase activity in these regions. There was no evidence that MPTP caused any marked DA and NA cell body death. MPTP given acutely transiently elevated serotonin levels. The results are compatible with a neurotoxic action of MPTP on both DA and NA nerve terminals. The nigro-striatal DA and the locus coeruleus NA neurone systems appeared to be most susceptible. Synthesis and utilization of residual striatal DA and cortical NA were increased, as often observed in partially denervated monoamine-innervated brain regions. Both DA and NA showed a gradual recovery, which took months to become complete and may have been related to a regrowth of catecholamine nerve terminals.
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  • 6
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A novel design for an airborne NOy converter was implemented, characterized in the laboratory, and used extensively for in situ tropospheric and stratospheric measurements of total reactive nitrogen (NOy). During field deployments, the converter is mounted outside the aircraft fuselage, avoiding the need for an inlet line. In flight, the converter can be calibrated by the addition of standard gases close to the sample inlet, compensating for any changes in the instrument sensitivity caused by changing operating conditions. The system has been used successfully during several Stratosphere Troposphere Experiments by Aircraft Measurements campaigns in the lowermost stratosphere and upper troposphere for the measurement of total reactive nitrogen. The detection limit of the system is approximately 100 pptv for 10 s integrated data (2σ). The precision, deduced from the reproducibility of the in-flight calibrations, is 7% and the accuracy is about 30%. Laboratory studies demonstrate that interference from HCN, NH3, and CH3CN is negligible for background conditions. © 2002 American Institute of Physics.
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