Stapedial otosclerosis and fluorine in the drinking water.
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Adolescent↗
Biomedical subjects
H J Daniel
Publications and source records attributed to H J Daniel.
Body position and acoustic admittance.
The purpose of this study was to determine the effects of body position on the acoustic admittance of the normal middle ear mechanism. Susceptance tympanograms were obtained and their values recorded to determine the significance of any differences among five different body positions. A positive pressure shift was found to occur at the point of maximum compliance between the upright body position and the remaining four recumbent body positions. Attention should be given to the effects that differing body positions have on acoustic admittance whenever assessment of this nature is anticipated.
Acoustic Impedance Tests↗
Anaerobic bacteria in otitis media.
Anaerobic bacteria, Peptostrepotococcus intermedius and Propionibacterium acnes, were found in mixed culture specimens from four to ten tested cases of chronic secretory otitis media. These anaerobic bacteria were in a mixed infection flora with aerobic bacteria most often Staphylococcus epidermidis and Cornybacterium sp. which do not fit any established species. The findings of anaerobic bacteria in otitis media is consistent with the sporadic report of the involvement of anaerobic bacteria in otitis media in the literature since 1898.
Anaerobiosis↗
Comparative anatomy of eustachian tube and middle ear cavity in animal models for otitis media.
The comparative anatomy of the normal eustachian tube (ET) and normal middle ear cavity of three animal species (rat, gerbil, and chinchilla) is described relating to the usefulness of these animals as models for otitis media (OM). Routine histological and anatomical techniques and procedures were used. The gerbil and chinchilla, although of different sizes, are quite similar, having hypertrophied middle ear bullae, nearly vertical ET, and similar histology including seromucous glands draining directly into the ET. In contrast, the rat has a small bulla, a nearly horizontal ET, and a large concentration of goblet cells but few mucous glands in the ET. It appears that the chinchilla and the gerbil may serve as alternative models for OM research. Chinchillas and gerbils are relatively free of naturally occurring OM, while the rat has a high incidence of naturally occurring OM.
Animals↗