The Effect of Core Learning Model on Students’ Metacognitive Skills in Lipid Material

Metacognitive is one of the important factors must have by student. This study aims to determine the effect of the CORE (Connecting, Organizing, Reflecting, and Extending) learning model on students' metacognitive sklills and find out the students' responses about it’s implementation. This research is a pre-experimental study with one group pretest-posttest design. The subject of this study was grade 3rd of biology education students. The instrument in this study is an essay and metacognition descriptor rubric to assess students' metacognitive skill, then questionnaires to obtain data on student responses that implemented the CORE learning model. Based on the results of the paired sample t test on student metacognition scores obtained sig. 0.00 <0.05, it means that there are differences between the results of the student's pretest and posttest. Then, based on N-gain analysis pretest and posttest data, it is known that the N-gain value is 0.71, it’s means high increase category,. Then the result of pearson correlation test to analyze correlation between cognitive learning outcomes and student metacognitive skills obtained sig. 0,00, it means that there was a correlation between the two of them. Based on some of these analyzesit can be concluded that the CORE learning model influences students' metacognitive skills on lipid material. This was supported by the results of a questionnaire showed that students gave positive responses about the application of the CORE learning model, it was known from questionnaire data, more than 85% of students felt the CORE model had a positive impact on learning.

Lipoid Pneumonia in a Gas Station Attendant

The exogenous lipoid pneumonia, uncommon in adults, is the result of the inhalation and/or aspiration of lipid material into the tracheobronchial tree. This is often confused with bacterial pneumonia and pulmonary tuberculosis due to a nonspecific clinical and radiologic picture. It presents acutely or chronically and may result in pulmonary fibrosis. We describe here a case of lipoid pneumonia in a gas station attendant who siphoned gasoline to fill motorcycles; he was hospitalized due to presenting with a respiratory infection that was hard to resolve. The patient underwent bronchoscopy with bronchoalveolar lavage, which, on cytochemical (oil red O) evaluation, was slightly positive for lipid material in the foamy cytoplasm of alveolar macrophages. Due to his occupational history and radiographic abnormalities suggestive of lipoid pneumonia, a lung biopsy was performed to confirm the diagnosis. The patient was serially treated with segmental lung lavage and showed clinical, functional, and radiological improvement.

Radiocarbon Dating of Single Compounds Isolated from Pottery Cooking Vessel Residues

We have developed and demonstrated a practical methodology for dating specific compounds (and octade-canoic or stearic acid—C18:0—in particular) from the lipid material surviving in archaeological cooking pots. Such compounds may be extracted from about 10 g of cooking potsherd, and, after derivatization, can be purified by gas chromatography. To obtain sufficient material for precise dating repetitive, accumulating, GC separation is necessary. Throughout the 6000-year period studied, and over a variety of site environments within England, dates on C18:0 show no apparent systematic error, but do have a greater variability than can be explained by the errors due to the separation chemistry and measurement process alone. This variability is as yet unexplained. Dates on C16:0 show greater variability and a systematic error of approximately 100-150 years too young, and it is possible that this is due to contamination from the burial environment. Further work should clarify this.