The Role of Prior Achievement as an Antecedent to Student Homework Engagement.

The benefits of homework on student learning and academic achievement, to a large extent, depend on the degree of student engagement. Motivational engagement (my intention or why I do the homework), cognitive engagement (how I get involved in homework), and behavioral engagement (how much homework I do, how much time I devote to it, how I manage that time) are key aspects that condition the quality of the process of doing homework, learning, and academic achievement. Prior academic achievement is one of the variables that seems to be positively related to student engagement (both due its motivational component and to the training to do homework).

Two Catechol Siderophores, Acinetobactin and Amonabactin, Are Simultaneously Produced by Aeromonas salmonicida subsp. salmonicida Sharing Part of the Biosynthetic Pathway.

The iron uptake mechanisms based on siderophore synthesis used by the fish pathogen Aeromonas salmonicida subsp. salmonicida are still not completely understood, and the precise structure of the siderophore(s) is unknown. The analysis of genome sequences revealed that this bacterium possesses two gene clusters putatively involved in the synthesis of siderophores.

Synthesis and antibacterial activity of conjugates between norfloxacin and analogues of the siderophore vanchrobactin.

From synthetic functionalized analogues of vanchrobactin, a siderophore produced by the fish pathogenic bacteria Vibrio anguillarum serotype O2, several vanchrobactin analogues-norfloxacin conjugates were obtained and their antimicrobial activities against the wild-type and mutant strains of Vibrio anguillarum serotype O2 have been determined.