Comparative study on the use of seasoned or unseasoned casks made of wood from different origins for the ageing of Sherry vinegar.

Background: In the present study, the ageing process of Sherry vinegar in used (seasoned) or new casks made of chestnut, American oak, Spanish oak or French oak wood has been investigated, considering that no research has investigated whether this seasoning has a definite influence on the final composition of the aged beverage. The polyphenolic and volatile contents of the aged vinegars were determined and their sensory properties were evaluated. Different statistical tools were applied to the data collected.

Problem-Based Learning in Prenursing Courses.

We conducted an observational study with 150 undergraduate nursing students to verify the usefulness of problem-based learning in the classroom and to ascertain whether this methodology facilitated the development of their knowledge acquisition skills. Problem-based learning fostered the development of integrated knowledge acquisition skills among nursing students.