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Biomedical subjects

K T Kalveram

Publications and source records attributed to K T Kalveram.

30 records · Page 2Linked to original sources
PubMed1988

Influence of bleeding order on plasma corticosterone concentration in the mouse.

The influence of the order of bleeding on corticosterone release in the mouse was examined. Female C57/BL6 mice were housed in groups of five animals in a low noise environment. After 10 days, they were successively captured and sacrificed every 2 minutes. The corticosterone levels increased in the fourth and fifth mice in a cage, i.e. within the time intervals from 4 to 6 minutes and from 6 to 8 minutes after the capture of the first animal. These results suggest that quiescent corticosterone levels can be measured only when the blood samples are obtained within 4 minutes following the capture of the first mouse.

Animals↗
PubMed1977

[On tremor during movement (author's transl)].

An analysis of the movement of stretching the right forearm showed that the frequency of tremor slightly decreases, whereas the average (absolute) acceleration of tremor and the average electromyoactivity (EMA) of the agonist increase as expected.

Adult↗
PubMedDate not supplied

Facial EMG responses to auditory stimuli.

Three studies were performed to investigate the effects of auditory stimuli (pure tones and environmental noise) of different intensities on surface EMG activity recorded over five facial muscle regions (M. frontalis lateralis, M. corrugator supercilii, M. orbicularis oculi, M. zygomaticus major, M. depressor anguli oris). The results show that with presentation of tones and noises of high intensity (> 85 dB) strong facial EMG reactions over muscles of the upper face (M. frontalis lateralis, M. corrugator supercilii, M. orbicularis oculi) were evoked. Among environmental noises of different valence but the same intensity, baby's crying evoked EMG reactions over facial muscles in the mouth region, possibly indicating that the subjects demonstrated expressions of dislike during this particular stimulation. It is also discussed whether facial EMG reactions to auditory stimulation of different intensities could be connected to changes in muscle tone of the middle ear muscles. The contraction of these muscles modulates sensitivity to auditory stimulation. Thus, facial EMG activity of the muscles of the upper face could serve as an indicator of sensitivity to external auditory stimuli. However, the evaluation of pleasant and unpleasant emotional reactions in response to auditory stimulation seems to be impossible.

Acoustic Stimulation↗
PubMedDate not supplied

A computer-controlled, long-term recording system for studying eating, drinking, and defecation behavior in miniature pigs.

The long-term observation of ingestive and excretory behaviors in freely ambulating and non socially isolated pigs is an important tool in the investigation of the physiological determinants of these behaviors. A computer-controlled laboratory setup for the recording of feeding, drinking, and defecation behavior in minipigs was developed, allowing for the observation of two pigs at a time for weeks. Four minipigs (29-52 kg) were conditioned to operate feeders with a precise food release per response and were then fed ad lib. The animals had up to 50% of their daily energy intake during the night. Meal size and time spent eating was highly correlated, meal size and the preprandial intermeal interval was moderately correlated, whereas meal size and the postprandial intermeal interval was not. Feeding facilitated defecation, supporting the assumption that the gastrocolonic response is present in the pig. The system has been shown to be highly reliable and valid, and thus provides an excellent tool for the investigation of the rhythmicity of ingestive and excretory behaviors in minipigs.

Animals↗