Dyening capacity

PLANTS DYEING CAPACITY

The students of 4th ESO have done some experiments biology and geology staining capacity the plants with or without sulfate aluminium.

Making Soap.

If I tell you:


Oil, Soda, Soap... Immediately you say: what are you talking about?


You only have to watch this presentation. Click on the picture.





Then, you have to answer these questions:

1.- What's the chemical reaction that forms soap?
2.-Identify the reactives and products in this reaction.
3.- Explain these two properties that are atributed to the soap:
a) Hydrophobic.
b) Lipophilic.
4.- Are you adjusted the reaction? In another case adjust it.

Experiment: Home Fire Extinguisher

PROCESING FYQ

1)Place some in a glass baking soda.

2) Add some vinegar to the glass

3) Place a lighted match on top of the glass. In a short time the mach will go out.

When the vinager is mixed with sodium bicarbonate the chemical reaction generates carbon dioxide. we can say that this carbon dioxide drowns out the match, because it prevents the oxygen of the air from feeding the combustion reaction.

To see the video, click here:
http://www.youtube.com/watch?v=Ua0hwVucd-4

Blood experiment

Protocol:

First day: Preparation of the extensions. These steps must be followed.
1. Extraction of capyllary not anticoagulated blood of a lateral face of the fleshy part of the third or fouth finger of one of the hands.
2. Place a small drop of blood approximately two centimeters away from the edge of de microscope slide.
3. We place the slide with the drop of blood on a table.
4. We grab another microscope slide with the forefingers and thumb of the right hand and lean it on the one that has the drop of blood in front of it. The angle between both slides has to be from 30 to 45 degrees.
5. Pull the slide back until it touches the drop of blood.
6. Let the drop spead through out the surface of contact of both slides.
7. Before the blood reaches the edges, slip slide forward with firm and uniform movement at avenage speed.
8. End up the displacement, approximately, one centimeters before the and, with on up word movement.
9. We quickly dry the extension, shaking up.
10. Once dried we will asses the extension with “methond” or ethonal covering it for three minutes.
11. Drain and let it dry.

Note: We rehearsed first with one drop water to ensure the technique.

Second day: Dyeing of “GIEMSA” and observation undar the microscope objetive of 40x and 100x. We take the following steps.
1. Dilution of dye of “GIMESACON 2 milliliters” of solution ph 7,2 in a test tube 0,2 milliliters.
2. Slowly mix in the tube and with a pipette “Pasteur” caver the “Frotis” for 25 minutes.
3. Wash and drain with water.
4. Wash with “Buffer” ph 7,2 until remains of the dye are eliminated.
5. Let it drain and dry vertically.
6. See the preparation trough the microscope.

Extension of blood.




1. Hold the slide.
2. Deposit blood.
3. Place the holder extensor.
4. Move the holder extensor.
5. Let the blood.
6. Slide the holder extensor.
7. Dry the extension.
8. Label the holder.

Click on the image to view video.




Activities.

1. As you can see in the video, we have done the blood film with the slide, because we consider it is the best method. Do you know any other process? What are the differences with the one we have used? What are the advantages and disadvantages?
2. What is to due the presence of streaks in a blood film? Can you draw the aspect on of a extension?
3. What are the cellular elements you can observe in the micrographs?
4. Why did the central part is the most pale?


Blood crossword puzzle game » make crossword puzzle
">Crossing word

Mass conservation Law

The students of 4th ESO have done some experiments in physics and chemistry we have found that air has weight. Mass Conservation Law Experiment

I hope you like

Mouth epithelium

Project Etwinning 2009/10

Experiencies without frontiers!

Experience 1: Study of oral epithelium and oral bacteria. Microscopy of the bacteria in yogurt. (two days)

Objectives:

Make a histologic and microbiological preparation: sample collection, extension, fixation, staining, washing and observation.

Directly observe the cells and bacteria in our mouth as well as those found in yogurt with active ingredients.

Recognize certain cell types and types of bacterial associations.

Materials:

Slides and coverslips

Enmangada needle or inoculation loop

Petri dish or staining tank

Wash bottle

Lighter

Methylene blue

Microscope

Protocol:

Day 1: Preparation of biological samples to be displayed. To do this follow these steps:

1: Extraction of the sample with a fingernail scraping the inside of the cheeks (buccal epithelium) or by scraping with a toothpick and carefully the insertion of the teeth and the gum (bacteria) or picking up a goto yogurt.

2: Place one got water (better in saline) on a slide and place the matter that we have extracted above.

3: With the needle enmangada perform a flutter prior smear slide.

4: Perform air drying.

5: Perform the setting from the slide through the flame of a lighter and avoiding overheating.

6: Place the smear on the petri dish to make a simple stained with methylene blue, letting it act between one or two minutes.

7: Remove excess dye by washing.

8: Meet the coverslip on the sample.

Day 2: Observing the strong microscope with 40x objective.

Click on the picture to see the video:

Mouth epithelium crossword puzzle game » crossword maker

Cell division in plants cells

The students of 4th ESO experiencies have done a biology in which even observe the differentphases in which cells are roots of an onion.
Cell Division Experiment.

I hope you like.