A differential item functioning study of counseling competencies scale-revised scores

Our study examines the differential item functioning of the Counselor Competencies Scale—Revised (CCS-R) scores due to respondents’ gender, the type of evaluation, and a combination of these two variables using a large sample (N = 1614). Implications of the findings are offered to inform counselor educators and supervisors using the CCS-R and similar supervisee assessment measures.     

A microfluidic device to study cancer metastasis under chronic and intermittent hypoxia

Metastatic cancer cells must traverse a microenvironment ranging from extremely hypoxic, within the tumor, to highly oxygenated, within the host''s vasculature. Tumor hypoxia can be further characterized by regions of both chronic and intermittent hypoxia. We present the design and characterization of a microfluidic device that can simultaneously mimic the oxygenation conditions observed within the tumor and model the cell migration and intravasation processes. This device can generate spatial oxygen gradients of chronic hypoxia and produce dynamically changing hypoxic microenvironments in long-term culture of cancer cells.     

An attitudinal study of computer-assisted testing as a learning method

The study investigated the effects of exposure to computer-assisted testing (CAT) as an effective instructional method and its effects on attitudes toward computer-assisted instruction (CAI). Five computer quizzes consisting of 20 randomly drawn multiple-choice questions were individually administered on 10 teletype terminals. A feedback mechanism was incorporated in the CAT program and provided detailed explanations of questions. Results indicated that subjects exposed to CAT had significantly more favorable attitudes toward CAI than subjects not exposed to CAT. In addition, CAT was perceived by students to be an effective instructional method in aiding mastery of conceptual and factual material.