Boutonneuse Fever in American Travelers Harris, Richard L.; Kaplan, Sheldon L.; Bradshaw, Major W. ...
The Journal of infectious diseases,
01/1986, Letnik:
153, Številka:
1
Journal Article
Recenzirano
Boutonneuse fever, Kenya tick-bite fever, African tick typhus, Mediterranean spotted fever, India tick typhus, and Marseille fever are various names given to infection by Rickettsia conorii . ...Although a few imported cases have been reported from the United States, most reports are from endemic areas where physicians and lay people (such as safari guides) are cognizant of this problem. With the reported increased incidence of this disease in endemic areas and increasing inter-continental travel, physicans in North America need to be aware of this treatable malady. In order to increase this awareness the authors are reporting one proven case and one presumptive case of infection with R. conorii seen recently in Houston.
The IBM 3480/3490 cartridge tape established a new format for digital data recording. Increased data rate and capacity compared to reel-to-reel digital tape technology was achieved along with a ...considerable reduction in the size and cost. Methods for the archival storage of magnetic tapes are discussed. The importance of proper binder selection to minimize chemical-degradation-induced deterioration of tape performance is reviewed briefly. In addition, the mechanical attributes of a magnetic coating required to minimize the friction, distortion, and detrimental effects of stress relaxation during long periods of storage are described. The importance of acquiring a detailed knowledge of the operable mechanisms that impact tape performance and the relevance of accelerated aging studies is emphasized. The design features of the 3480/3490 magnetic tape subsystems that improve its toleration of tape deficiencies are discussed. The mechanisms of failure to which these tape subsystems are ultimately vulnerable are then used to recommend procedures and conditions for optimum storage of recorded tape cartridges.< >
The forest pathogen Dothistroma pini (Scirrhia pini) infects the needles of many pine species, causing needle loss and consequently
retarded wood growth. Only one strain of Dothistroma pini is ...present in New Zealand. Because over 90% of commercial forests in
New Zealand are planted with the susceptible species Pinus radiata, a study of the global diversity of D. pini strains was initiated to
assess the threat of further unwanted introductions of the pathogen. A collection of D. pini strains from eight countries was studied
in the UK. The production of dothistromin toxin by the strains, and DNA sequence analysis of the ribosomal ITS region, confirmed
their identification as D. pini, although strains from the central USA contained two nucleotide substitutions in the ITS region.
Colony morphologies and growth rates were diverse, but all strains which sporulated showed a similar wide range of spore size. The
morphological features examined did not support separation of the strains into the two groups shown by ITS sequences. Most
striking was the production, in axenic culture, of extremely high levels of dothistromin toxin by strains from Germany and, to a
lesser extent, some from the USA (>500 times and >40 times as much as the New Zealand strain, respectively). The high level
of production of dothistromin toxin by some strains is a concern for forest health as well as for forest workers and needs to be
evaluated further.
A chemostat system has been developed to model the attachment of oral bacteria, and the subsequent development of plaque film, to acrylic surfaces immersed in steady state cultures. Plaque was ...removed from the teeth and gingival margin of volunteers who refrained from oral hygiene for at least 72 h. Samples were pooled and inoculated into a complex growth medium maintained at 37 degrees C. Glucose-limited continuous culture was established at a dilution rate of 0.05/h and at pH 7.0. Microbiological analysis of the culture indicated that a complex community of oral bacteria was established, typical of that found in dental plaque. Acrylic tiles were immersed in the fermenter through a modified fermenter head and incubated therein for up to 21 d. Scanning electron microscopy showed that either side of the tiles contained a rough and a smooth surface and these initially favoured the attachment of fusiform bacteria, particularly on the rough surface. Cocci attached to those surfaces which were not heavily colonized by the fusiforms and eventually grew into and on the colonial sheets of the fusiforms.
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