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Forskolin is a diterpene derivative isolated from the Indian plant Coleus forskohli. Forskolin has positive inotropic action on the isolated guinea pig heart, on the isolated left atrium of the guinea pig heart and on the dog and cat heart in situ. It increases the heart rate. The positive inotropic effect on the increase of heart rate are not blocked by(More)
Forskolin is a positive inotropic-acting and blood pressure lowering agent which was isolated from the Indian plant Coleus forskohlii. In isolated heart tissue, forskolin activates a membrane bound adenylatecyclase and a cytoplasmic cAMP-dependent protein kinase to a much higher degree than does isoprenaline. This activation does not require the hormone(More)
Previous studies in man have shown that during beta-adrenoceptor blockade physical exercise caused a significantly greater elevation of plasma catecholamines than without blockade. After blockade of beta-adrenoceptors, increased levels of circulating catecholamines should have an unopposed effect on adrenergic alpha-receptors. In order to elucidate such an(More)
Carp (Cyprinus carpio) hemoglobin readily autoxidizes in blood smears. Quantification of Soret-band absorbance in individual erythrocytes by means of scanning cytophotometry therefore requires more elaborate methods of preparation of blood samples. Of the fixatives that have been tested, suspension of whole blood in isotonic salt solutions containing(More)
BACKGROUND & AIMS Colonoscopy is the preferred screening test for colorectal neoplasia; the fecal occult blood test (FOBT) detects neoplasias with low levels of sensitivity. Computed tomographic colonography detects neoplasias with high levels of sensitivity but involves exposure to radiation. We investigated whether magnetic resonance colonography (MRC)(More)