It is of particular interest to determine whether Rb can substitute for K in the active transport mechanism of the cochlea. In order to answer this question, perilymphatic perfusion and vascular ...perfusion with K-free and Rb-substituted media were done using 33 guinea pigs. Potassium-free perilymphatic perfusion led to a decline of the EP after latent period of about 3 min. and application of the Rb-substituted solution led to a substantial recovery. When the reduction of the EP due to K-free perfusion was not severe, subsequent perfusion with Rb-substituted solution completely restored the potential. Potassium-free vascular perfusion also led to a decline of the EP and the CM after latent period of about 30 min. and application of the Rb-substituted blood led to a substantial recovery of the both potentials. These two sets of data suggest that K can be replaced by Rb in the active transport mechanism of the cochlea.
The effect of perilymphatic perfusion with oxygenated artificial perilymph upon the EP of the ischemic cochlea was investigated in the guinea pig. Perfusion at a high flow rate in scala vestibuli ...could well recover and maintain the EP to the level before the ischemia, whereas perfusion in scala tympani could not recover the EP as effectively. This finding seems to suggest that, in an anoxic cochlea, oxygen when supplied in scala vestibuli gets easier access to the stria vascularis than when supplied in scala tympani.
We focus on the research required to establish a foundation for the evolving needs of visualization systems. Three main topics underpin these needs: models, the need for abstractions to describe the ...core components of the visualization process and the interfaces between them, including users and their behavior; validation, the problem of determining whether visualizations meet consistency and effectiveness criteria on test data or measures; and systems, the design, realization, and operational problems of systems integrating a range of functionalities to give scientists a working environment for visualization. We outline key aspects of each topic, commenting on the current status of work and isolating areas that require significant research. We conclude by suggesting strategies to initiate this research.< >
The effect of perilymphatic perfusion with oxygenated artificial perilymph upon the EP of the ischemic cochlea was investigated in the guinea pig. Perfusion at a high flow rate in the scala vestibuli ...could well recover and maintain the EP to the level before the ischemia, whereas perfusion in the scala tympani could not recover the EP as effectively. This finding seems to suggest that, in an anoxic cochlea, oxygen when supplied in the scala vestibuli gets easier access to the stria vascularis than when supplied in the scala tympani.
A retrospective study concerning anamnestic data as well as an internal and dactyloscopic examination were caried out on 75 woman who were delivered from a deformed child. Apart from the well-known ...causes of a deformity the chronic arterial hypertension is emphasized as teratogenetic factor. The dactyloscopic examination did not result in an accumulation of stigmata which refer to a genetic condition of the deformities. Differences concerning the distribution of patterns on the finger-tips need further investigations; at present they are not yet to be explained.
After having described the bases of dactyloscopy, the authors report on the clinical importance of this method in gynecology and obstetrics. Own results about Turner's syndrome and first experiences ...of the dactyloscopic examination of mothers of malformed infants are discussed. The patients with XO Turner's syndrome in our series have a ridge count of 181, comparable to the value of 178, 6 observed by Penrose. Mothers of infants with congenital malformations have no different dactyloscopic features in comparison with the controls.
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