Rafael Urquiza

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The presence of carbohydrates was investigated in the vestibular end organs of the guinea pig using FITC-lectins. The following sugars have been identified: N-acetyl-glucosamine, galactose, mannose and fucose. In contrast, N-acetyl-galactosamine was not clearly detected. These sugars were suggested to be closely related to the formation and maintenance of(More)
The effect of gentamicin on the glycoconjugates in the vestibular end organs is demonstrated using FITC-lectins. Five milligrams of gentamicin dissolved in 0.1 ml. saline was injected in a single dose into the middle ear of adult guinea pigs. Seven days after the injection, the fluorescent reactivity of Wheat germ agglutinin (WGA), Abrus precatorius(More)
CONCLUSIONS The epidemiological characteristics of otosclerosis and its treatment in Andalusia resemble those of other populations with similar socioeconomic levels. Two complementary approaches, such as questionnaires and pure-tone audiometry, are required to assess the effectiveness of otosclerosis surgery (OS) reliably and precisely. OBJECTIVES We(More)
In order to obtain information about the sequence of events leading to degenerative changes in the cochlea after acoustic trauma, a systematic LM study was performed in the guinea pig organ of Corti. The results were correlated with measurements of CAP N1 thresholds from the same animals. Twenty pigmented guinea pigs were used in the study. Ten of these(More)
CONCLUSIONS The characteristic features of the Hh specimen conformed to those of other Pleistocene human fossils, indicating strong cranial structures and a heavy mandible. The mastoid was large and suggested a powerful sternocleidomastoid muscle. The inner ear and tympanic cavities were similar in size and orientation, suggesting that their functions were(More)
Endocochlear Potential (EP) was measured in male Wistar rats under control conditions and renal failure produced by means of bilateral nephrectomy. Results show a statistically significant (p less than 0.01) decrease in EP measured in animals with renal failure. This finding is in accordance with the decrease in Na-K ATPase activity found in the cochlea and(More)
The AA. working with Gerbils (Meriones unguiculatus) experimentally deprived of their kidneys attempt to find out the behaviour of the BLB. The study was accomplished through the dynamic examination of the osmolality and ureic concentrations of the perilymph, the blood and in spinal fluid as well. Furthermore the role of the BLB in the origin of(More)
CONCLUSIONS The hydrodynamic model of the labyrinth spaces (LHM) is a useful tool for research on implantable audioprostheses, in particular to develop suitable actuators using MEMS technology (micro-electromechanic machine system). It has other potential applications for auditory research. OBJECTIVES The energy reaching the labyrinth fluids is crucial(More)