snip20161017_17

Development and Validation of a Concept Test in Introductory Physics for Biology Students

Abstract

This study is focused on the development and validation of a concept test in Introductory Physics for Biology students as a diagnostic tool, a misconception test, a formative assessment tool, and a summative test. Its final form is a 50-item multiple-choice concept test in Introductory Physics for Biology 1st term (Mechanics, Fluids & Heat) students wherein each item has four choices. One among the choices serves as the correct answer while the rest are considered distracters. It was originally developed as a 67-item multiple-choice concept test in Introductory Physics for Biology students covering all the topics specified in the syllabus of the course offered at the Philippine Normal University. Classical test item analysis and validation were conducted to establish test validity while item reliability was tested using Cronbach’s Alpha, which was 0.67, and K-R 21, which was 0.70. Read More

snip20161017_16

MALDI-TOF Mass Spectrometry and Analytical Profiling Index Characterization of airborne Staphylococci

Abstract

Indoor air quality is often measured in terms of nonviable contaminants. In the Philippines, the viable components of air have not received as much attention as the nonviable counterparts. Among the viable components of indoor air are airborne bacteria, which are potential health hazards. In this initial study, airborne bacteria present in an indoor cafeteria were characterized. Bacterial isolates from indoor air were analyzed using Matrix-Assisted Laser Desorption Ionization Time-of-Flight Mass Spectrometer (MALDI-TOF MS). Mass spectral analyses of the 64 environmental isolates revealed high proportions of Staphylococcus spp., Bacillus spp., Micrococcus spp., and Lactobacillus spp. Read More