Lowie P. Jager

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The feasibility of using the Barn Owl (Tyto alba guttata) to monitor environmental quality in the Netherlands was investigated, using Cd, Cu, Pb, Mn, and Fe as indicators for environmental contamination. Throughout 1992, bird-watchers, volunteers, and officials submitted 53 birds. The age and geographical distribution of these birds, formed a representative(More)
The feasibility of using Buzzards found dead as indicators of environmental contamination was tested. Liver, kidney, and tibia specimens were examined for the presence of Cd, Cu, Pb, Mn, and Fe, which were used as markers. All buzzards submitted to the Veterinary Institute in 1992 were examined for cause of death and condition. Results showed that more than(More)
Concentrations of carbadox and a first metabolite, desoxycarbadox, were measured in contents of the porcine gastrointestinal tract after in-feed administration of carbadox in therapeutic dosages (100-150 ppm). The levels of carbadox in the relevant parts of the gastrointestinal tract were found to be lower than the MIC-values reported for enteropathogenic(More)
The effects of non-narcotic analgesics have been examined, separately and in admixture, on carrageenan-induced hind paw oedema and on yeast-induced hyperalgesia and hyperthermia in adult rats. The efficacy of the drugs was evaluated using the kinetics of drug-receptor interaction. In addition, the hypothesis was tested that the anti-inflammatory, analgesic(More)
Field stimulation of the circular muscle of the opossum esophagus produces a transient hyperpolarization (inhibitory junction potential, IJP) followed by an "off" depolarization. A similar nonadrenergic, noncholinergic (NANC) response in guinea pig taenia caecum has been shown to be due to an increase in the potassium ion permeability of the smooth muscle(More)
The electrical properties of the circular smooth muscle layer from the North American opossum esophagus (body) were studied in vitro by microelectrode recording techniques, both at rest and during stimulation of intramural inhibitory nerves. All observations were made at 37 degrees C in an Abe-Tomita partitioned bath on muscle strips dissected 2 cm orad of(More)
Indomethacin induced erosions in the glandular part of the rat stomach in a dose-dependent manner. Gastric erosions became apparent about 15 min after administration of indomethacin and the damage was maximal at about 4 h. The erosive activity of indomethacin administered subcutaneously was similar to that after oral administration, confirming the data of(More)
Effects of stimulation of intramural nerves in the circular smooth muscle layer of the porcine colon (Sus scrofa domestica) were studied using the sucrose-gap technique. Electrical field stimulation of the preparation, superfused with Krebs solution at 21 degrees C, induced a transient hyperpolarization of the smooth muscle cell membrane. This(More)
Effects of stimulation of intramural nerves in the circular smooth muscle layer of the body of the oesophagus of the opossum (Didelphis marsupialis) were studied, simultaneously measuring the membrane potential of muscle cells using the sucrose-gap technique and contractions of the muscle. Electrical field stimulation of the preparation, superfused with(More)