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Biomedical subjects

P Moller

Publications and source records attributed to P Moller.

At least 37 records · Page 2Linked to original sources
PubMed1984

Locomotor and electric displays associated with electrolocation during exploratory behavior in mormyrid fish.

In the presence of a novel stimulus such as an aluminum or a plastic rod mormyrid fish (Marcusenius cyprinoides and Gnathonemus petersii) exhibit characteristic motor probing acts (PMAs): 'chin probing', 'radial' and 'lateral va-et-vient', 'lateral probing', 'tangential probing', and 'stationary probing'. During the display of these PMAs the fish maintain characteristic probing distances from the object which were 4.5 cm for the metal and 2.5-3.7 cm for the plastic stimulus. G. petersii with their electric organ rendered inoperative ('silent fish') no longer exhibited 'radial' and 'lateral va-et-vient'. Regardless of the nature of the stimulus the probing distances were shorter in 'silent' fish and ranged from 1.8 to 2.6 cm. During the display of PMAs intact fish changed their variable electric organ discharge rate to a unique and stable, regularized rate, with the interdischarge interval maintained at 28-30 ms. The fish's electric and non-electric (motor) probing behavior in the presence of novel objects (and following their removal during phantom PMAs) is discussed in light of theories on exploratory behavior.

Animals↗
PubMed1980

A renal lesion in ankylosing spondylitis.

2 patients with ankylosing spondylitis (A Sp) were found to have renal lesions similar to those seen in IgA nephropathy. In 1 patient the changes were extremely severe and progressive and in the other they were mild. Vascular changes were also noted in 1 patient. The findings suggest an immune complex mediated glomerulonephritis and support an earlier report that there may be a specific renal lesion in patients with A Sp. The significance of IgA deposition in the mesangium, and of an increase in the serum levels of IgA in some patients with A Sp is unclear.

Adult↗
PubMed1979

Spatial aspects of electrolocation in the mormyrid fish, Gnathonemus petersii.

The range of electrolocation in the weakly electric fish, Gnathonemus petersii, was determined for plastic and aluminium cubes. A characteristic change in the fish's EOD activity, and abrupt change to more uniform EOD intervals (regularization), was used as the criterion for object detection. The average response distances extending laterally from the fish's longitudinal axis were significantly different (p less than 0.05) for the aluminium cube (5.4 cm) and the plastic cube (7.0 cm).

Animals↗
PubMed1976

Electric signals and schooling behavior in a weakly electric fish, Marcusenius cyprinoides L. (Mormyriformes).

Field recordings of electric organ discharges and catches of Marcusenius cyprinoides showed that these electric fish form groups and move about in schools. The role electric organ discharges in group cohesion was investigated by comparing interactions in groups of intact and operated, electrically silent fish. The absence of electric organ dischares reduced locomotor activity and resulted in the disappearance of two behaviors: parallel lineup and single file swimming. Electric signals are considered part of a schooling mechanism that aids the fish in maintaining group cohesion in their turbid enviornment and during migration at night.

Animals↗
PubMed1976

Electric organ discharges of the weakly electric fish Gymnarchus niloticus (Mormyriformes) in its natural habitat.

Electric organ discharges (EODs) of Gymnarchus niloticus in its natural habitat (Chari River, Chad Basin) and accompanying ecological data (pH, conductivity, temperature, turbidity, O2 dissolved) were recorded. The EOD frequencies ranged from 204 to 313 Hz (day) and 196-326 Hz (night). In social swimming the range of interfish EOD frequency differences was from 4 to 82 Hz. The EOD frequency seems to decrease with the age of the fish.

Age Factors↗
PubMed1976

[Dental instrument as foreign body in the air-passage].

A case report on a Kerr-broach aspirated to the left bronchial tree is presented. The broach was removed with difficulties using bronchoscope and forceps. The use of rubber dam is advocated in endodontic therapy. A scheme to handle foreign bodies in the bronchial tree is outlined involving immediate X-ray and removal by an experienced endoscopist.

Bronchi↗