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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of infection and chemotherapy 6 (2000), S. 233-239 
    ISSN: 1437-7780
    Keywords: Key words Aspergilloma ; Operation ; Intracavitary instillation ; Systemic therapy ; Itraconazole
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report five cases of aspergilloma. Three patients had a previous history of tuberculosis, including one who fully recovered after resection of the right lower lobe. Four patients were treated mainly with oral itraconazole. Two of these four patients, died, one of massive hemosputa, and one of heart valve disease, while two had a good outcome, although one of them has since developed respiratory insufficiency and has received oxygen therapy. In itraconazole therapy, the daily dose may be 200 mg or more, and the duration of treatment may be 1 year or more. Percutaneous intracavitary instillation of amphotericin B, performed in one patient, showed no efficacy. The efficacy of this treatment may depend on the width and number of drainage bronchi, and on the mechanism of acceleration of degradation of the fungus ball. It is important to carefully choose the therapy for aspergilloma, with due consideration being given to the patient's pulmonary function and general status.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1617-4623
    Keywords: Key wordsThermotoga ; ArgR protein ; Thermostability ; DNA binding ; Arginine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The hexameric regulatory protein ArgR formed by arginine-mediated dimerization of identical trimers governs the expression of genes required for arginine metabolism and some other genes in mesophilic and moderately thermophilic bacteria. We have cloned the argR gene from two hyperthermophilic bacteria of the genus Thermotoga. The two-domain ArgR proteins encoded by T. neapolitana and T. maritima share a low degree of sequence similarity with other bacterial arginine repressors. The ArgR protein from T. neapolitana binds to an operator located just upstream of its coding sequence and, therefore, the argR gene may be autoregulated. The protein has extremely high intrinsic thermostability and tolerance to urea. Moreover, its binding to target DNA increases the melting temperature by approximately 15° C. The formation of oligomeric ArgR-DNA complexes is a function of protein concentration, with hexameric complexes being favoured at higher concentrations. In the presence of arginine the hyperthermophilic ArgR protein binds to its own operator, argRo, only by forming hexamer ArgR-DNA complexes, whereas both trimer-DNA and hexamer-DNA complexes are detected in the absence of arginine. However, the affinity of T. neapolitana ArgR for DNA has been found to be higher for a mixture of trimers and non-bound hexamers than for arginine-bound hexamers. Our data indicate that genes for arginine biosynthesis are clustered in a putative operon, which could also be regulated by the ArgR protein, in the hyperthermophilic host.
    Type of Medium: Electronic Resource
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