January 31st blog
January 26, 2009
Explain the two types of active transport and what occurs when active transport takes place.
Have a grat weekend—Mrs. D.
January 30th Blog
January 26, 2009
Describe the difference between active and passive transport? What happens when too much water enters a cell?
Blog Jan 29th
January 26, 2009
Why were the eggs soaked in vinagar? What happened to the shell of the egg? When the egg was covered by corn syrup, did the egg lose weight or gain weight? Was the egg in a hypertonic or hypotonic solution?
What occured when distilled water was poured in the cup? When you weighed the egg after pouring the water off, did the egg gain mass? Is this a hypotonic or hypertonic solution?Explain!
Jan. 28th Blog
January 26, 2009
Rice is a carbohydrate, what color does rice turn when iodine comes in contact with it? When iodine was dropped in the water and absorbed through the semi-permeable plastic sandwich bags—what process has occured? Is this a form of active or passive transport? Explain.
Blog Jan.27th
January 26, 2009
In class you saw a few demonstrations representing the process of diffusion and osmosis. When we spayed the stinky body spray where particles moved from a high concentration to a low concentration, what process would you say occurred? When we dropped the blue food coloring in water, explain what happened. Explain the word that describes when the particles has reached it’s limit or has completely diffused?
Blog Jan. 26, 2009
January 26, 2009
The cell membrane is composed of phospholipids that are semi-permeable. Some very small elements can diffuse through the membrane. How would particles go through the membrane without the use of energy if they can’t fit through the phospholipids? If no energy is required, what type of transport is occuring–passive or active?
SAT Blog Friday January 23rd
January 23, 2009
six questions
Jasmine wanted to find out if hot water froze faster than water at room temperature. She filled one ice cube with tray with hot water and another ice cube tray with room temperature water. She put the trays into the freezer and checked them every hour to determine if ice had formed.
1. The next steo in Jasmine’s experiment should be _________-
a. record her observations
b. interpet her results
c. draw a conclusion
d. form a hypothesis
2. Before starting the expermient, Jasmine _______that the hot water would take longer to freeze than rooom temperature water.
a. recalled
b. observed
c. concluded
d. predicted
3. Why did Jamine test both hot and room temperature water?
a. It is allowed her to state her results as a theory
b. it helped her to form a hypothesis
c. it allowed her to make a valid comparison
d. it is easier to perform two test
4. During Jasmine’s experiment, the independent variable was the __________-
a. volume of the water
b. temperature of the water
c. time that the water took to reach the freezing point
d. freezing point of water
5. Name two ways that jasmine could present the data to the class?
6. What could Macy do to expand her experiment?
Class Information about Diffusion and Osmosis
January 23, 2009
This week you learned about diffusion and osmosis. We told silly stories to get the point across. Here are some pointers that you should keep in mind when thinking of these two processes.
Diffusion deals with concentrated particles moving from a higher concentration to a lower concentration.
examples: —-diffusion of blue food coloring through water
—-when iodine was dropped in water and traveled through the plastic baggies to turn the rice black
Osmosis is the diffusion of WATER across a semi-permeable membrane from a higher concentration to a lower concentration.
—-We soaked eggs in vinegar to dissolve the shell off each egg so that the membrane in exposed. We measured the weight of the egg to determine the mass and then we covered the eggs in corn syrup overnight. You measured the egg today after draining the corn syrup off. Think about what caused the egg to decrease in weight. How will the weight change when your egg is covered with distilled water? This is the process of osmosis—-water is traveling through the the semi-permeable membrane of the egg.
Read about the Cell Cycle this weekend—I will make it really nice for you if you can answer questions next week—–We will learn about how cells divide. It’s amazing to learn how we are created by a single cell that divides until cells make tissue and tissue makes organs and organs make organ systems and organ systems make an organism!!!!! You are one in a million. Who wants to hear me sing this beautiful song. haaa-haaaa
Robot Inspects Wind Energy Converters
January 20, 2009
The material of wind energy converters must withstand intense forces. Are rotor blades damaged? A new robot inspects wind energy converters more precisely than a human ever could. It detects the minutest damage – even below the surface.
It appears reliably and appears alone. Nimbly and quickly, it pulls itself up a rope meter for meter until it reaches a wind energy converter’s giant rotor blades. Then it goes to work. It thoroughly inspects every centimeter of the rotor blades’ surface. Nothing escapes it. It registers any crack and any delamination in the material and relays their exact positions. In this job, a robot is superior to humans.
Five Invasive Plants Threatening Southern Forests In 2009 Identified
January 20, 2009
U.S. Forest Service Southern Research Station (SRS) Ecologist Jim Miller, Ph.D., one of the foremost authorities on nonnative plants in the South, today identified the invasive plant species he believes pose the biggest threats to southern forest ecosystems in 2009.
