The availability and daily absorption of iron was determined by the extrinsic label method in typical lower middle to lower class diets consumed in regions of Argentina, Brazil, Chile, Mexico, Peru, and Venezuela. Differences in iron absorption from meals up to 7-fold, could be attributed to the varying contents of absorption enhancers, eg, in meat, and of inhibitors in tea, vegetables, and wheat or maize bread. The total iron available in the diets from four countries did not meet the physiological requirements for normal subjects but deficient subjects fulfilled their requirements absorbing from 1.0 to 2.1 mg/day. In five diets heme iron (6 to 24% of the total) provided 34 to 73% of the iron absorbed. These data suggest that such absorption and utilization studies may be used to correlate the prevalence of iron deficiency in a population with certain diets and to guide fortification programs.
Efecto de dietas con lecitina de soya en el crecimiento, muda y supervivencia de machos del camarón de río Cryphiops caementarius (Crustacea: Palaemonidae) Effect of diets with soy lecithin on the growth, molting and survival of males of the river shrimp Cryphiops caementarius (Crustacea: Palaemonidae
Scientific practices are still largely absent from undergraduate curricula. Incorporating primary scientific literature (PSL) and podcasting into course curricula is an engaging way to provide instruction in scientific practices to undergraduate students. We present an innovative class project for biology undergraduates where students read a piece of PSL, develop annotations to learn more about the research contained within the PSL, and develop and produce a podcast episode to share the research findings with a general audience. To understand student perceptions of the project, we conducted surveys to obtain qualitative responses along with measures of science identity and project ownership. We found that the students felt like the project belonged to them and that their work on the project would ultimately benefit the scientific community. Here, we include a project handbook, schedule, and materials that can be used by any instructor to carry out this project.
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