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close this bookBiology Demonstration Manual (Peace Corps, 1993, 35 p.)
View the document(introduction...)
View the documentForeword
View the documentAcknowledgements
View the documentBibliography
View the documentClassification of living organisms
View the documentThe food chain game
View the documentGrowing peanuts
View the documentRoots
View the documentRoot hairs
View the documentVascular bundles
View the documentPresence of minerals in soil
View the documentNecessity of sunlight
View the documentTransport of water in plants
View the documentTranspiration
View the documentPresence of starch in leaves
View the documentPollination
View the documentSeed dissemination
View the documentSeed structure
View the documentCotyledons
View the documentNecessity of water for germination
View the documentRainfall on leaves
View the documentGrowth curve of a plant
View the documentGrafting
View the documentImportance of ground cover
View the documentCell-tissue-organ-system-organism
View the documentLength of the small intestine
View the documentEnzymes
View the documentThe three food groups
View the documentThree food groups homework
View the documentCarnivore and herbivore teeth
View the documentThe food chain game
View the documentLong capacity
View the documentModel lung
View the documentBlood circulation
View the documentHow physical activity affects heart and breathing rates
View the documentLocomotion
View the documentAntagonistic muscles
View the documentSuction
View the documentFern reproduction
View the documentMoss preservation
View the documentAre yeast living organisms?
View the documentYeast
View the documentYeast budding
View the documentNitrogen fixing nodules
View the documentAmoeba
View the documentBursting red blood cells
View the documentLength of a ténia
View the documentModel of a schistosome
View the documentAdaptations
View the documentMountain formation
View the documentArtesian well
View the documentBone structure
View the documentReflexes
View the documentTest for glucose
View the documentTest for starch
View the documentTest for fats
View the documentTest for proteins
View the documentCooling effect of sweat
Open this folder and view contentsMICROSCOPE PREPARATIONS

Bone structure

Class: 3

Lesson: Les os

Rationale: Demonstrate that calcium gives bone its firm structure by dissolving the calcium in acid.

Materials: cooked chicken bones (cleaned of meat and gristle) vinegar glass plastic/rubber band

Procedure:

Preparation a week in advance:

1. Place a bone in a glass of vinegar and cover with plastic. It will take about a week to dissolve the calcium depending on the size of the bone.

In class:

2. Test the flexibility of an untreated bone.
3. Test the flexibility of the bone soaked in vinegar.

Note: This can also be done with 20% HCI and will only take few days. HCI can be bought in Bangui at Cedox or other paint/hardware stores. Ask for "esprit de sel" or "acide hydrochlorique". To make 20% HCI add 540 ml of concentrated HCI to 460 ml of water.

Source: Silver Burdett Biology, p. 583 and T91.