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[Interaction of leucine with the plasma membranes of catfish taste buds].

The binding of L-[3H]leucine by the plasma membranes from the catfish Ictalurus nebulosus taste organ was studied. The two types of specific binding centers for amino acid with high (KD = 2,5 X 10(-10) M) and low (KD = 1,04 X 10(-9) M) affinities were found. Concentrations of high and low affinity centers were 11,85 nmol/mg and 26 nmol/mg respectively. The structural rearrangement of the surface layer of the chemoreceptor membrane was revealed by spin label technique using 5-doxylstearic acid at leucine concentrations 10(-4)-10(-9) M.

Animals↗
PubMed1965

ABSENCE OF TASTE-BUD PAPILLAE IN FAMILIAL DYSAUTONOMIA.

No fungiform papillae could be found on the tongues of 30 patients with familial dysautonomia. In ten of these patients a search for vallate papillae was made, but none were found. Inspection of the tongue may thus be useful for diagnosing this rare disease, even in infants. Absence of these sensory receptors suggests that the multiple sensory deficits found in persons with familial dysautonomia may be related to defects in the peripheral receptors.

Autonomic Nervous System Diseases↗