Jose Luiz Costa

TL;DR: It is demonstrated that Aya not only inhibits early behaviors associated with the initiation and development of Eth addiction, but also showed effectiveness in reversing long-term drug effects expression, inhibiting the reinstatement of Eth-induced behavioral sensitization when administered in the Eth-associated environment.

TL;DR: In this article, the effect of temperature on the plastic viscosity was examined, and it was concluded that an Arrhenius type equation describes this effect, which can be described by two types of equations, power-law and exponential expressions.

TL;DR: The results indicate that smoking marijuana during pregnancy even at low doses can be embryotoxic and fetotoxic.

TL;DR: In this article, the authors studied the kinetics of the vapor phase esterification of acetic acid with ethyl alcohol, at atmospheric pressure, catalyzed by a macroporous sulfonated styrene-divinylbenzene (DVB;20%) resin.

Abstract: X-type zeolite was synthesized from kaolin previously dealuminated through reaction with sulfuric acid at high temperature to raise its SiO2/Al2O3 ratio. All of the steps in the synthesis of X-type zeolite from dealuminated kaolin were studied. Parameters analyzed included temperature, time, stirring speed, and composition ratios. The optimum values for the variables were the following: In the gel formation step, temperature was 60 °C, time was 1 h, and stirring speed was 450 rpm. In the aging step, temperature was 20 °C and time was 12 h. In the crystallization step, temperature was 80 °C, time was 24 h, and stirring speed was 0 rpm. The optimum molar ratios were SiO2/Al2O3 = 3.2, (Na2O + K2O)/SiO2 = 1, H2O/(Na2O + K2O) = 30, and K2O/(Na2O + K2O) = 0.1. Some significant differences from other works were observed, particularly in the aging and crystallization steps. These variations in the synthesis process might be caused by changes in the kaolin structure occurring during dealumination with sulfuric acid.