Double-linked Hylleraas configuration-interaction calculation for the nonrelativistic ground-state energy of the Be atom.
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Journal Article↗
Biomedical subjects
H Kleindienst
Publications and source records attributed to H Kleindienst.
FUNCTION OF THE TENSOR MUSCLE IN THE CICADA TIBICEN LINNEI
The calling song and the disturbance squawk of the cicada Tibicen linnei (Insecta: Homoptera) are described in terms of their physical parameters. The calling song is composed of quiet parts, which are very similar to the disturbance squawk, and loud parts, which are amplitude- and rate-modulated. The role of the tensor muscle acting on the tymbal frame in modulating the sound pulse amplitude was investigated. We demonstrate by tensor nerve recordings, by mechanical mimicking of the tensor muscle action and by electrical stimulation of the tensor nerve, that the contraction of the tensor muscle is responsible for (a) initiating sound production and (b) modulating the sound pulse amplitude. These results allow us to construct a model which suggests that the tensor shifts the tymbal into a mechanical working range that enables sound production and modulation of the sound pulse amplitude.
Journal Article↗
AUDITORY THRESHOLD CHANGE IN SINGING CICADAS
The hearing sensitivity in singing cicadas is reduced during sound production by a folding of the tympanal membranes. Using electrophysiological recording and nerve stimulation techniques, we have shown an effect of the folded tympanum on the auditory threshold of two species of cicadas, Tibicen linnei and Okanagana rimosa. Auditory thresholds of both species increased by about 20 dB when the tympana folded during singing. In T. linnei the increase in threshold affected the whole frequency range, from 1 to 16 kHz, in a similar way. Electrical stimulation of one or both auditory nerves resulted in a folding of both tympanal membranes in a way very similar to that seen in singing animals. We have demonstrated that a cicada male is able to adjust its auditory threshold within a range of about 20 dB by the tympanal folding mechanism.
Journal Article↗
["The Venus of Pest"--expedition of an anatomical beauty].
The Semmelweis-Museum in Budapest, Hungary, has a small collection of anatomical wax models. Studying the correspondence of the Austrian emperor Joseph II., then King of Hungary with representatives of the Hungarian administration, we were able to find out the origin of these models, their transportation to Hungary and their large significance in anatomical teaching at the end of the 18th century in Hungary. These models are the result of a long-lasting cooperation between artists and anatomists, particularly in Italy. Their artistic climax is reached during the second term of the 18th century, reflecting the complex interaction of contemporary sociocultural trends i.e. popularization of results of scientific research, traits of enlightenment combined with an artistic hyperidealistic typization as known from classical antiquity and sponsored financially as a means of imperial representation. The aim of the study was to point to the eminent importance of this collection as a monument of cultural heritage.
Anatomy↗