CULTURE OF VINEGAR FLIES
Drosophila, best known as vinegar fly or fruit fly, is the little fly you see flying around vinegar and on fruit during the fall. Why raise vinegar flies? To observe their development, to observe the chromosomes of their salivary glands during division, to perform experiments on genetics, finally as food for amphibians that have just completed their metamorphosis. In this case it is necessary to breed a species that can't fly. You can obtain individuals with vestigial wings (wings which are not fully developed) at a university Biology or natural sciences department.
Culture medium recipe for drosophila: water 83 ml, agar-agar g, sugar 5 g, brewer's yeast 10 g, alcohol ml, nipagin
g. Nipagin M is used as a preservative in foods and cosmetics, like agar-agar, you can buy it at the stores that sell science items for laboratories. Mix the yeast and the sugar, add agar-agar and water and simmer for 3 minutes. Turn off the heat. Dissolve the nipagin in alcohol and add to the rest when it has stopped smoking. Mix and let it set.
You can find other recipes at the following websites:
http:///fly/ A quick and simple introduction to Drosophila melanogaster
http:///gcka/ Fruit Flies - Drosophila melanogaster
http:/// Drosophila Culture (how to culture flightless fruit flies)
http:///AE/AEPC/WWC/1994/ Observing the Development of Drosophila in Apple Juice Agar
http:///atg/released/0083-BettyAnnWonderly/ Drosophila Genetics Lab I
http:///~entweb/amer_ A bibliography for an insect field biology course
http://-/svt/ La drosophile (in French)
Internet keywords: drosophila culture -cells, wingless fruit flies vinegar fly.
At the core of inquiry-based science is direct exploration of phenomena and materials. Thus, the first criterion is that phenomena selected for young children must be available for direct exploration and drawn from the environment in which they live. The study of snails is an example of an exploration that meets these criteria. Others include light and shadow, moving objects, structures, and plant and animal life cycles. Examples of some that do not meet these criteria include such popular topics as dinosaurs or space travel. While these are often brought up by children because they are part of the media environment around them, they are not appropriate content for inquiry-based science in the classroom because they present no opportunity for direct exploration on the children’s part and even the simplest explanatory ideas are developmentally problematic. Other topics often chosen in early childhood classrooms such as the rain forest or animals of the Arctic (polar bears and penguins) may be based in appropriate concepts (habitat, physical characteristics, and adaptation of animals), but these too lack the possibility for direct engagement. Topics such as these need not be excluded. They can be the subject of important dramatic play, elaborate discussion, and exploration using books and other secondary sources. The problem arises when they take time away from or substitute for inquiry-based science experiences.
Alpine . In Latin the word for ‘high mountain’ is ‘alpes’. Alpine biomes are found in the mountain regions all around the world. They are usually at an altitude of about 10,000 feet or more.
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