Category Archives: art science

SciTV Session 2

Tish cameraWe are starting the second session of SciTV this week. We will be meeting on Tuesdays and Thursdays from 3:15 to 4:45.

The focus of the show is “REPTILES”. We are discussing what a reptile is–you might be surprised to find out the definition of a reptile. Reptiles in film, turtles, intelligence in reptiles and of course dinosaurs.

You will learn how to work professional quality cameras, do some acting, writing, and collaborating with some interesting folks!

Come join us! Contact Ms. Provencher and/or Mr. Ireland for the details.
PS this program covers missed absences!

Shey-Dancing Bio-student

shey 3Shey is always singing. She raps about everything. She is good at it, really good at it. Last month she participated in a play about culture and color. The play was written by professional play-writes, but based on the stories of the young girls in the play. She being one of them. She was not shy. She got up there and did three shows for the whole school.
shey 1 shey 2

Their troupe is now going on a county-wide tour to share their stories and inspiration.

Kudos!

Optical Illusions by Henry

Optical illusions are caused by a trick on the brain which makes you think your seeing things that really not there., for example the spinning dancer, as you look at it one side of the brain thinks it’s spinning counter-clockwise and the other thinks it’s spinning the other way.
rabbit duck
Another is duck or rabbit, this one is quite mind blowing due to the brain sees a bunny but not a duck due to the mind sees only a rabbit but if you turn look at it just enough you see a duck which the mind hides the duck deep into the image so your eyes do not see a duck and your brain starts to get creative and starts to see a duck.
Most people see the duck first and can flip between the two representations, but the question is: how easy is it for you to flip between them? Does it require real mental strain, or can you do it at will?

triangle illusionThe last one confuse me is the three corners. The three corners messes with your brain they ask you if you see a triangle which a non real triangle  to appear and thinks it is a triangle but it’s not real  so it fools the person into thinking there is one, all it is just three corners, this effects the brain by putting the image in your mind which you will try to find one but as you search the mind soon thinks there is one in the three corners.

Endocytosis

Phagocytosis edithEndocytosis is a process in which a substance (good stuff like: food, water and something yummy, or bad stuff like foreign bacteria or debris)  enters into a cell without passing through the cell membrane. Instead it is surrounded by the cell membrane and brought in via a vesicle or vacuole. This process takes ENERGY and is considered active transport. This process is subdivided into three different types:

  • pinocytosis–cell drinking
  • phagocytosis–cell eating
  • receptor mediated endocytosis–where the substance attaches to a receptor and is taken into the cell.

Here the students poked some fun at endocytosis and made some cartoons! Enjoy and learn.

cell eating sabrina cell eating adrianna cell drinking brian phagocytosis thomas
endocytosis sam

Plant Cells Lab

Background: The students in my class designed a new plant cell lab. Instead of using onion skin cells they headed outside on a brisk fall morning to collect some crouch grass. The grass was soaked in a beaker of water while they prepared their lab sheets.

They came up with several simple hypotheses about what they might see through the microscope. Below is an example of a lab report by Danielle.

Title: Beautiful Grass

Statement of Problem: The question we are trying to answer is will we see different types of cells in the grass leaves and stems.

Hypothesis: By looking at the piece of grass, close up under the microscope we will see different types of cells.

Materials: compound microscope, piece of grass, pipette, water, mini beaker and cover-slip

Procedure: First we collected the grass and set up the materials. Second, we put the piece of grass on the slide and put one drop of water on the grass, and quickly pressed it down with the cover-slip, to help to see it better. Then we focused the microscope under low power and looked at it.

Results:

Grass cells at 1000x Photographed by Edith

Grass cells at 1000x Photographed by Edith

We saw beautiful green cells. It was very amazing.

Conclusion: Yes, our hypothesis was correct. We saw two kinds of cells, long cells and square cells. Something we learned here is to look at things more closely and see what is inside of things because you might be surprised.

Bacteria

  • Bacteria are the oldest and most successful organisms on Earth. They have been around for 3.5 billion years according to the fossil record

    bacteria in petri dish

    For this lesson students used their creativity and made 3-D models of a simple example of a bacteria in Petri dishes.

  • Are unicellular and very small (microscopic)
  • Most are spherical or rod-shaped and have one or two types of cell walls (polysaccharides/gram positive and polysaccharides bound to lipids/gram negative and resist antibiotics)
  • Lack membrane bound organelles
  • Contain no nucleus
  • Reproduce by division (can divide very fast depending on food and space) called binary fission
  • Share DNA through conjugation—horizontal gene transfer
  • Include kingdoms Archaebacteria and Eubacteria
  • Are autotrophs—make their own energy from the sun or in some cases from hydrogen sulfide in deep ocean volcanic ic vents or from ammonia in the soil.
  • They can also be heterotrophs, need to feed on dead animals, animal waste, dead plants or they are parasitic (cause disease)
  • Can form biofilms and act as a single entity (using cell to cell signaling)
  • Beneficial
    •  —blue-green bacteria, blue-green algae, and Cyanophyta put oxygen into the atmosphere and created life as we know it
    • Decomposers, add nutrients to soil
    • Nitrogen fixing bacteria take nitrogen from air, put it in soil as ammonia so plants can make proteins
    • Used to make food and drugs
      • Yogurt
      • Insulin for diabetics and other medications
  • Cause of disease
    • Through water, food, air
    • Tuberculosis, diphtheria, bubonic plague, typhus, tetanus, cholera, typhoid, leprosy, Lyme disease
    • Decay your teach (but also eat plaque off teeth)
    • Cause ulcers
    • Contaminate food left at room temperature-botulism, Salmonella
  • Control of spread of bacterial disease
    • Do the elephant
    • Practice good sanitation and hygiene
    • Vaccines
      • Weakened or dead pathogen injected helps immune system recognize invaders