Do parent and self-report rating scales of executive function measure the same constructs with adolescents?

OBJECTIVE: There are numerous measures of executive function (EF), yet the multiple definitions and constructions of EF suggest that these measures may not be measuring the same construct or domains within EF. The purpose of this study was to examine the concurrent validity of the BRIEF and the CEFI parent and self-report forms with adolescents. METHOD: Adolescent participants, ages 12-17 years, were recruited using a snowball method with recruitment targeting individuals from under-represented groups, as well as the general population. The resulting sample consisted of 52 cases with parent report. The adolescents were predominantly female (55.77%) and white (40.38%) with a mean age of 14.56 (1.72). RESULTS: For parent and adolescent self-report on both the BRIEF and CEFI, mean global scores were within the average range. To examine whether the two rating scales were measuring the same underlying constructs of EF, a multi-trait-multi-method (MTMM) model was conducted using correlated traits correlated methods (CTCM) and correlated traits uncorrelated methods (CTUM). CONCLUSION: While the global scores obtained for the instruments measure EF similarly, there is less consistency in how the subdomains parse out and are labeled for each of the two scales. Implications for practice are discussed.

The effects of elevated carbon dioxide levels on a Vibrio sp. isolated from the deep-sea.

INTRODUCTION: The effect of oceanic CO2 sequestration was examined exposing a deep-sea bacterium identified as Vibrio alginolyticus (9NA) to elevated levels of carbon dioxide and monitoring its growth at 2,750 psi (1,846 m depth). FINDINGS: The wild-type strain of 9NA could not grow in acidified marine broth below a pH of 5. The pH of marine broth did not drop below this level until at least 20.8 mM of CO2 was injected into the medium. 9NA did not grow at this CO2 concentration or higher concentrations (31.2 and 41.6 mM) for at least 72 h. Carbon dioxide at 10.4 mM also inhibited growth, but the bacterium was able to recover and grow. Exposure to CO2 caused the cell to undergo a morphological change and form a dimple-like structure. The membrane was also damaged but with no protein leakage.