Treatment of zinc deficiency without zinc fortification

Zinc (Zn) deficiency in animals became of interest until the 1950s. In this paper, progresses in researches on physi-ology of Zn deficiency in animals, phytate effect on bioavailability of Zn, and role of phytase in healing Zn deficiency of animals were reviewed. Several studies demonstrated that Zn is recycled via the pancreas; the problem of Zn deficiency was controlled by Zn homeostasis. The endogenous secretion of Zn is considered as an important factor influencing Zn deficiency, and the critical molar ratio is 10. Phytate (inositol hexaphosphate) constituted up to 90% of the organically bound phosphorus in seeds. Great improvement has been made in recent years on isolating and measuring phytate, and its structure is clear. Phytate is considered to reduce Zn bioavailability in animal. Phytase is the enzyme that hydrolyzes phytate and is present in yeast, rye bran, wheat bran, barley, triticale, and many bacteria and fungi. Zinc nutrition and bioavailability can be enhanced by addition of phytase to animal feeds. Therefore, using phytase as supplements, the most prevalent Zn deficiency in animals may be effectively corrected without the mining and smelting of several tons of zinc daily needed to correct this deficiency by fortification worldwide.     

Training Teachers to Use Food to Teach Science

ABSTRACT:  In January 2006, every science department chair in U.S. public, private, and parochial high schools received information on food science, including a DVD, poster, and experiment guide developed by the Institute of Food Technologists (IFT), IFT Foundation, and Discovery Education. To promote the experiments and to encourage implementation of the program's components in secondary schools, the IFT K-12 Career Guidance Committee presented a teacher training session at the national IFT Annual Meeting + Food EXPO® in Orlando, Florida, on Monday, June 26, 2006. Twenty Orlando-area science teachers were treated to 3 h of activities, during which they performed and learned how to teach 3 experiments from the areas of physics, chemistry, and biology, demonstrated by the committee. In addition, to extend the effects of the session beyond the Orlando area, IFT member Food Science Ambassadors were invited to the training session so that they could become proficient in demonstrating the experiments, and to equip them with the knowledge to host a training session in their own geographical area in the future. Fifteen Food Science Ambassadors attended the session. After lab time, K-12 Career Guidance Committee members and IFT Student Association (IFTSA) chapter presidents led small groups of teachers on tours of the EXPO floor to learn more about how science is applied in the food industry.     

Instructional systems design and public schools

This article is a reply to the commentary of Shrock and Higgins, which appears elsewhere in this issue. The original article by Martin and Clemente that sparked the discussion appeared inEducational Technology Research and Development, Volume 38, Number 2 (pp. 61–75).     

Methodik und Ergebnisse einer Experimentreihe über Entwurfsmuster

Software-Entwurfsmuster sind eine intuitiv einleuchtende Idee, die viele Befürworter hat. Als Forscher dürfen wir die behaupteten Wirkungen von Entwurfsmustern jedoch nicht einfach glauben, sondern müssen sie gründlich prüfen. Dieser Artikel beschreibt die wichtigsten Behauptungen und entwickelt daraus zugeh?rige Forschungsfragen. Wir diskutieren die Methodik für ein Forschungsprogramm, das die Fragen beantworten soll, und skizzieren praktische Beschr?nkungen, unter denen diese Forschung ablaufen mu?. Es folgt eine kurze Beschreibung von drei kontrollierten Experimenten und den Hauptfolgerungen aus ihren Ergebnissen. So sollte man zum Beispiel die Benutzung von Entwurfsmustern in einem Entwurf genau dokumentieren und Entwurfsmuster nicht einsetzen, ohne alternative Entwürfe zu prüfen. Abschlie?end diskutieren wir ein im Rahmen des Forschungsprogramms geplantes viertes Experiment. Der Beitrag dieses Artikels liegt vorrangig in einer Beschreibung und Diskussion wichtiger methodischer Aspekte kontrollierter Experimente in der Softwaretechnik.     

Child Voice: How Immigrant Children Enlightened Their Teachers with a Camera

Changes in global patterns of residence mean that preschool teachers welcome immigrant children and families into preschools in increasing numbers. Many teachers report both anticipation and apprehension about having immigrant children in the classroom. Apprehension is related to concerns about a lack of enough knowledge about languages and cultures to sensitively work with children and families. To overcome apprehensions and challenges, teachers are encouraged to learn from the work of other adults. This study builds upon research that suggests that teachers can also look to the children as a source of knowledge. The purpose of this study was to explore how preschool immigrant children might use a disposable camera to communicate with their teachers. The participants of this qualitative study were immigrant and native-born students in a local preschool. Each child was given a disposable camera, instruction about taking photographs and the request to take pictures of what was important to them. Data were collected by recording each child telling the teacher about the pictures. Data were analyzed for themes, patterns and categories. Findings indicated that the messages that the children conveyed to their teachers included important information about language development and family cultural identity. Findings also identify teacher strategies that helped and hindered child ability to communicate during the photo-narration process. An implication of the study was a shift of child agency within the teacher child relationship during photo-narration activity.