Neste trabalho foi descrita a anatomia do esôfago de cada um dos peixes: Hoplías mtabarícus - ictiófago; Prachilodus marggravii e Prochilodus affinis - iliófagos; Leporinus reinhardti; Bryan: lundii e Pimelodus sp. - onívoros. O esôfago destas espécies é curto e tubular. A grande distensibilidade deste órgão, em especial em Hoplias malabaricus, Pimelodus sp. e Brycon lundíi, pode ser atribuída ao padrão da mucosa, a qual é constituída de pregas longitudinais espessas e numerosas. | In this investigation the anatomy of the esophagus of Haplias malabaricus piscivorous, Prochilodus marggravii and Prochilodus affinis- detritivorous, Leporinus reinhardti, Brycon lundii and Pimelodus“ sp. - omnivorous was studied.. The esophagus ef these species is short and tubular. The great distensibility of this organ, especially; in Hoplias malabaricus, Pimelodus sp. and Brycon lundií, can be attributed to the pattern of the mucous membrane which is composed cf thick and numerous longitudinal falas.

Neste trabalho foram estudadas duas diferentes adaptações anatômicas do estômago de peixes de água-doce ao hábito alimentar carnívoro, ictiófago. Em Haplias malabaricus, a região cárdica é longa e, em função do padrão da mucosa, bastante distensível. Em Acestrorhynchus lacustris e Acestrorhynchus britskii é a região cecal que apresenta tais características. | In this study two different anatomic adaptations of the stomach of fresh water fishes to the canivorous, piscivorous feeding habit were invesligated. In Hoplias malabaricus, the cardic region is long and, due to the pattern of the mucous, very distensible. In the Acestrorhynchus lacustris and Acemorhynchus brítskii, it is the caecal region that presents these characteristics.

We studied the first-order degradation kinetics of Bisphenol F diglycidyl ether (BFDGE) in three water-based food simulants [3% (w/v) acetic acid, distilled water, and 15% (v/v) ethanol] at various temperatures. BFDGE and its first and second hydrolysis products were determined by reversed phase high-performance liquid chromatography with fluorescence detection. Nonlinear regression was used to fit the experimental data at 40, 50, and 60 degrees C with the proposed kinetic equations; the Arrhenius equation was then fitted to the rate constants obtained, and the kinetic models were tested by comparing experimental data obtained at 70 degrees C with the kinetic curves calculated using the rate constants predicted for this temperature. The half-life of BFDGE was longest in ethanol and shortest in acetic acid. The difference between the hydrolysis rates of BFDGE and Bisphenol A diglycidyl ether may be due to 10% of the BFDGE used being in n = 1 monomer form. The results imply that resins which comply with existing legislation on the migration of unreacted monomer may still contaminate foodstuffs.