Yeast Observation

Part of the study on Fungi, we also observed yeasts reproducing.

Materials Needed:
* 1 T. Baker's yeast
* 1 T. sugar
* 2 C. warm water
* Methylene blue
* compound microscope
* depression slide
* cover slip
* cup or glass
* medicine dropper

Procedure:
1) In a glass, mix yeast, sugar and warm water. Allow the mixture to sit for about 10 minutes. You are waiting for the yeast cells to grow and multiply.

2)Using the medicine dropper, place a drop of the yeast mixture into the well of a depression slide. Add 1 drop of methylene blue stain. Place a cover slip over the sample and place on the microscope stage.

3) Focus on low power. Then, move to high power. Identify a reproducing cell and the tiny bubbles of carbon dioxide given off by the cells.

Getting to know Fungi

  Black mold: magnified @ 4/0.16x

In this activity, we will grow and observe a number of different fungi which are present in our environment.

Materials Needed:
* slice of hard cheese
* slice of bread
* orange, apple or banana peel
* 3 sealable plastic sandwich bags

Procedure:
1) Inoculate your growing media (bread, cheese and fruit peel) by gently wiping each across a dusty surface.
2) Place each item inside individual sandwich bags. Add 2 tablespoons of water to each bag and then seal.
3) Place all 3 bags in a dark, warm location for 4 to 5 days or however long it takes to see mold growing in each item.

After 8 days, we removed the samples. Except for the cheese which we need to redo, we got these:

The orange peel

The bread

After observing the molds (color, size, smell, etc), we cut an entire colony from the orange peel and the bread and mounted it on the microscope slide.

Woooow! we were blown by what we saw. "Cool, Mom" was what Gia's first reaction. We are now officially loving our microscope and what it can do! =D

The orange peel had black molds growing on it. After several researches, we found out that it is Aspergillus Niger.

Kingdom : Fungi
Class: Eurotiomycetes
Order: Eurotiales
Family: Trichocomaceae
Genus: Arpergillus

Aspergillus Niger: magnified @10/0.25x

The bread on the other hand, had green mold with white cover on it. It is said to be Penicillium mold.

Kingdom : Fungi
Class: Eurotiomycetes
Order: Eurotiales
Family: Trichocomaceae
Genus:Penicillium

Penicillium magnified @ 4/0.16x

Penicillium magnified @ 10/0.25x

 
Results of the cheese will be posted here soon.

What an awesome day spent experimenting and researching and getting to know Fungus/Fungi!!

Practicing the Use of the Microscope

 

In these succeeding activities, we familiarized ourselves with our newly-arrived compound microscope. We got excited with all the possibilities and discoveries we shall experience using it.

Our first activity was to learn how to prepare a wet-mount slide and observe that slide using the microscope.

Activity 1: 

* Cut a small letter "g" from the newspaper and place it at the center of the glass slide. Newspaper works best for this activity as it is fairly thin and allows light to pass through it for easier observation on the microscope.

Drawing what we saw: top - magnification @ 4/0.16x; below - magnification @ 10/0.25x

Activity 2:

We did the same for a piece of blue thread and Gia's hair.

Blue thread mounted on a slide

@ High magnification: 10/0.25x

Hair at low magnification: 4/0.16x

Hair at high magnification: 10/0.25x

Awesome first tries, right? Can't wait for the next experiments.

A Different kind of Birthday

Yes, a surprise birthday gift from my Mom. A ticket to Jonas Brothers concert in Manila!

A great excuse for Music Appreciation, being independent (yes, our Mom's were not with us---they were outside at the mall window shopping while waiting for us haha), and enjoying being a teenager.

My friend, Yeda, and I had a wonderful  and unforgettable night to remember. Really enjoyed singing and dancing with the Jonas Brothers.

Enzymes as catalysts

Experiment # 10: How enzymes work

Materials Needed:
* Two jars with lids
* diluted hydrochloric acid
* ground beef (raw)
* iodine
* crackers
* cornstarch
* dextrostik strips (to test for sugar)

Procedure:
1) In one jar, place diluted hydrochloric acid (muriatic acid) and a piece of ground beef.
2) In the second jar, put a piece of ground beef. Leave for 24 hours.
3) After 24-hours, compare the beef on both jars.
4) What is your explanation?

5) Chew a cracker for 30 seconds without swallowing.
6) Describe the change in flavor and explain the result.

7) Collect several teaspoons of saliva in a glass (saliva contains enzyme amylase).
8) Mix a paste of 1T. cornstarch and 1 c. of water.
9) Heat to boiling and cook for 10 min. Stir to prevent burning.
10) Put  1T. of the thick paste into each of  2 jars.
11) Add 1T. of saliva to one jar and 1T. of water to the other. Place in warm place for 1 hour.
12) Examine visually.
       * Describe any difference in appearance.
13) Perform the carbohydrate test on each for sugar.
      * Describe the result.
14) Perform  the carbohydrate test for starch on each.
      * Describe the result.

Findings

Photo above:
Clockwise: Jars of meat after 24 hrs; jars of meat before putting muriatic acid on one jar; water jar tested for starch; water jar tested for sugar; saliva jar tested for starch; saliva jar tested for sugar.

Findings:
* Beef with the acid rapidly decomposed.
* Jar with saliva and corstarch appears clearer than the jar with water. It has sugar but does not show starch.
*Jar with water and cornstarch has no sugar but has starch.
* That enzyme amylase in saliva turns starch in food to sugar while being chewed. That is why the crackers tasted sweeter.
* Digestion breaks down proteins into its component amino acids.

Organic Compound # 2

Experiment # 9 Testing for Protein

Materials Needed:
* Protein chemical indicator (see below for details)
* Flour
* cheesecloth
* bouillon
* Dextrostik strips  or Cinitest (to test sugar)
* Iodine (to test carbohydrates)
* a variety of food

Chemical Indicator : a mixture of household ammonia with a few drops of 3% copper sulfate solution

Procedure:
1) Add some chemical indicator mixture to milk. What color do you observed?

L-carbo test; R-protein (#4,5)

2) Dissolve a bouillon cube in hot water and test with protein chemical indicator. What did you observe?
3) Obtain a cup of flour and mix with water to form a stiff paste. Knead for about 10 minutes, put into a cheesecloth and continue kneading under water. Continue rinsing until the water becomes milky.
4) Test the water for carbohydrates. What were your results?
5) Test the water for protein. What were your results?
6) Test a portion of the residue in the cheesecloth for carbohydrate. What were your results?
7) Test the residue for protein. What were your results?
8) Discuss results in steps 4, 5, 6 and 7.
9) Try various foods to see if they contain protein.
10) Write a summary of your results of this experiment.

Top: R- meat tested for protein; Below: L-residue tested, R- fruits tested

Findings:
* Soluble starch from flour paste dissolves in water
* Insoluble residue left in the cheesecloth is protein
* Meat has protein
* Fruits tested do not have protein

Organic Compounds #1

Experiment #8 : Testing for Sugar and Starch

Materials Needed:
* Powdered Starch
* Beakers or tumblers
* several fruits and vegetables
* Dextrostik or Clinitest (to test sugar)
* Iodine
* Sugar (Karo syrup)

Procedure:
1) Put a teaspoonful of starch in one beaker of water and a teaspoonful of sugar in a second beaker of water. Stir both solutions.
2) Test for starch with Iodine and sugar with Clinitest tablets or Destrostik strips.
3) Test several fruits and vegetables for starch and sugar.

L-R: Sugar; starch

Testing for Starch L-R: potato, apple, pineapple, carrots

Testing for Sugar L-R: apple, pineapple, carrots, potato

Findings:
* The beaker with starch turned blue.
* The strip turned green when dipped in the beaker with sugar.
* Potato, carrots, apple turned blue when tested with iodine. Pineapple had no reaction.
* Potato and apple showed changed color on their respective strips. While carrots and pineapple did not.

Chemical Reaction #2

Experiment # 7: Energy + Chemical Reaction

This activity will show how energy added to a chemical reaction increases the rate at which products are formed.

Materials Needed:
* 3 large test tubes
* 3 small test tubes
* 3 water baths
* yeast
* sugar (Karo syrup)
* ice
* heat source

Procedure:
1. Put a small amount of yeast into a glass jar. Add 1/3 cup of warm water. Stir until dissolved.
2. Fill the small test tubes with the scant solution of yeast and a small amount of sugar.
3. Invert the large test tubes over the smaller ones; then invert again so smaller ones are mouth down inside the larger ones.
4. If an air space occurs in a smaller test tube, measure its height and record.
5. Place one test tube in an ice bath, leave the second set at room temperature, and the third in a warm water bath.
6. Record the height of the gas columns for each tube at the start and for every 15minutes interval for 1 hour.

Note: The yeast cells are undergoing cellular metabolism,producing carbon dioxide, being collected int he small inverted test tubes.

@ 0 minutes

@60 minutes, L-R: room; cold;warm

Question:
* Which tube did the yeast produce the most gas?
* What is the effect of temperature (Energy) on the chemical reaction taking place?

Findings:
* Warm set produced more gas (CO2)
* We therefore conclude that, when subjected to high temperature, there was rapid rate of reaction.

God's grace of dance. . .

My daughter, Gia,  and I have been in this journey for almost 8 years now. I never thought we will be on this road for this long.

1st public show @ Rockwell

When Gia ( at 6 years old) said she wanted to take up ballet, I thought it was just one of those passing fancy of kids her age. You know, the thing where in, they loose interest after 8 sessions or after one summer. From about 12 kids in her ballet class at the start of the school year,  to just 3 by March, I remember Teacher Nida saying she would have easily stopped teaching but she could not because she saw the eagerness of the kids to learn.

Summer of 2007, Gia told me that she wanted to continue with ballet and that to try another school just for summer. After several researches, phone calls and consideration of finances and logistics,  we (Gia and I) decided to enroll her at the CCP Dance School. I remember her wanting to watch the company class at the Rehearsal Hall after we dropped by to enroll, and meeting her teacher for that summer instead.

Gia's 1st big stage show -- as a turtle :)

That summer was one of Gia's turning point. Her being promoted to the next level and her experience to dance on a big stage has boosted her love for ballet. She asked me if she can be enrolled for the school year at the CCPDS, even if it's just for Saturday classes.

It was a bumpy yet beautiful ride from then on for both of us. Gia went on to be a full scholar of the dance school. Performing a handful of roles and repertoire -- from classical ballet, modern ballet, contemporary ballet and Hip Hop.  She is still at it with gusto!

Meanwhile, I continue to be a supportive, loving and dependable PA (Personal Assistant) cum driver for her. (Of course, Yaya Rose should not be left out either. God bless her. ).  I decided to leave my corporate job, more than a year ago,  after realizing that the stress, the demands, the issues and even the compensation is not worth giving up the chance to see my daughter grow up and LIVE. I look back with no regrets because now, I know,  I am living a more purposeful Life.

 oh. . . and, I do not want to miss the chance to be a "stage mother".   ;)

"For I know the plans I have for you, declares the Lord, plans for welfare and not for evil, to give you a future and a hope."
Jeremiah 29:11 

Chemical Reaction #1

Experiment #6 : Chemical Reactions

An experiment to illustrate that chemical reactions are a part of our daily life.

Materials Needed

Materials needed:
* Household yeast
* Beaker or jar
* sugar
* warm water
* limewater

Procedure:
* Empty enough amount of yeast  into a glass jar.
* Add 1tbsp sugar and 1/3 cup of warm water.
* Stir until smooth. Let the mixture stand for 45 minutes and examine:

    1) What do you observe at the surface?
    2) Describe the smell.
    3) Test the gas produced  by transferring some of the solution to some limewater. If CO2 is present, the water will become milky.

as soon as water was added

15-min after

after 45 minutes

added to limewater

Findings:

* Sugar serves as a nutrient to the yeast to produce its energy.
* Product of this Chemical reaction is carbon dioxide and water.

Electrolysis Experiment

Experiment #5: Electrolysis

Lifted from Lifepac Science (Grade 10):

"Compounds are made up of elements bound together to form completely unique substances. This experiment will attempt to verify that water (H2O) is made up of hydrogen and oxygen..."

Electrolysis

Materials Needed:
* 2 Test tubes

* 6-volt or 9-volt dry cell batteries
* 2 electrodes or tin foil
* 250ml beaker
* wooden splints
* wire with alligator clips on both ends
* candle
* 1M sodium sulfate solution (dissolve 14.2 grams sodium sulfate in distilled water and dilute to 100ml)
* piece of cardboard
* stirring rod
* ruler
* matches

Procedure:
* If you can not find a ready electrolysis gadget, cut holes in cardboard just large enough for the tubes to be held snugly.

* Fill test tubes with 1M sodium sulfate solution along with the 250ml beaker. Try to eliminate any trapped air in the test tubes, and fill the beaker to about 3/4 full. Invert the tubes to the solution in the beaker, keeping the open ends of the tubes submerged.
* Connect the battery (+ to -, - to +) to the other end of the wire. Connect the other end of the wire to tin foil or electrodes. Make sure the ends of the wires are secured in the open ends of the test tubes.
* Watch to make sure gas bubbles begin to form on the ends of each of the electrodes in the test tubes.
* When the tubes have significant amount of of gas collected, measure the height of the level of gas in each of the test tubes and record it.
* Slowly lift the tubes up. Be careful when handling the tubes to not let the gas escape. Place your thumb or finger over the mouth of each tube. Which of the tube holds the oxygen? Which one holds the hydrogen?
* Light the candle and use it to ignite one of the wooden splints. Blow out the splint and insert the smoldering end of the split into the tube wit the smaller amount of gas. Record results.
* Light another wooden splint and hold it at the mouth of the 2nd tube. What do you see/hear?

Findings:
* Electrolysis separates H2O (water) to Hydrogen and Oxygen
* The tube with smaller amount of gas is Oxygen
* The tube with the biggest amount of gas is Hydrogen
* Hydrogen "pops" or explodes (depending on the amount of gas) when exposed to heat


Note: we were able to find an electrolysis gadget and used it instead of improvising.