Characterization of antimicrobial effect of organotin-based catalysts on diesel-biodiesel deteriogenic microorganisms.

Organotin compounds are applied in several industrial reactions and can present antifungal and antibacterial activities. Incorrect handling and storage practices of biodiesel and diesel-biodiesel blends can lead to microbial development, impacting its final quality. Concerning this problem, this work investigated the antimicrobial action of two organotin catalysts used in biodiesel production with four isolated microroorganisms (Bacillus pumilus, Pseudomonas aeruginosa, Pseudallescheria boydii, and Aureobasidium pullulans) and a pool of microorganisms (ASTM E1259 standard practice).

Positive and negative affect schedule: psychometric properties for the Brazilian Portuguese version.

This study is about the validity and item analysis for the Positive and Negative Affect Schedule (PANAS), respectively through the Exploratory Factor Analysis (principal components method) and the Partial Credit Model (PCM). The scale has been largely used in areas ranging from clinical to social psychology since its release in 1988 by Watson, Clark, and Tellegen. In order to assess validity and item properties (Item Response Theory paradigm), this is study administered PANAS to 354 respondents, 115 male and 239 female subjects, with an average age of 29.

Brazilian mothers' knowledge about home dangers and safety precautions: an initial evaluation.

Worldwide, unintentional injuries are a major cause of emergency department visits, hospitalization, permanent disability, and death among children. Today, unintentional injuries are the leading cause of death in children aged 1-14 years in South American countries, including Brazil and Argentina. The majority of unintentional injuries happen in or near the home, and researchers have pointed out that prevention efforts should include the active involvement of parents and caregivers.