INTRODUCTION AND METHODS. Serotonin N-acetyltransferase (NAT) is a rate-limiting enzyme in melatonin biosynthesis. Its activity (which parallels melatonin levels) follows a diurnal rhythm with high values at night and low values during day-hours of any light-dark illumination cycle (1). In retinas NAT is expressed by photoreceptors (2). Exposure of animals to light at night suppresses the noctu...

People who supplement their diets with extra zinc usually have potentially harmful changes in lipoprotein metabolism. Because zinc can interfere with copper metabolism and copper deficiency has produced similar changes in lipid metabolism in animals and people, the hypothesis that lipid alterations from high zinc intakes are accompanied by changes in copper metabolism was tested. Progenies of s...

Adenosine receptors modulate dopaminergic function by regulating dopamine release in presynaptic neurons and intracellular signaling in postsynaptic striatal neurons. To investigate how adenosine impinges on the action of dopamine in feeding and locomotion, genetically altered, dopamine-deficient mice were treated with adenosine receptor antagonists. Acute administration of the nonselective ade...

Immunochemical Characterization of Temperature-Regulated Production 1 of Enterocin L50 (EntL50A and EntL50B), Enterocin P, 2 and Enterocin Q by Enterococcus faecium L50 3 4 5 Raquel Criado, Jorge Gutiérrez, María Martín, Carmen Herranz, 6 Pablo E. Hernández, and Luis M. Cintas 7 8 9 10 Departamento de Nutrición, Bromatología y Tecnología de los Alimentos, Facultad de 11 Veterinaria, Universidad...

in order to examine the effects of essential oils and silver nanoparticles as anantimicrobial preservative in the solutions of alstroemeri cv. sukari cut flowers, anexperiment was conducted with 11 treatments and 3 replications in a completelyrandomized design. in this study, we used essences of carvacrol, thymol and zataria oilwithconcentrations of 50 and 100 mg l-1 and silver nanoparticles wi...