Wednesday, March 13, 2013

Current Event 1 Quarter 3


Petra 7A
Science
Mrs. M.
http://www.cbc.ca/video/news/audioplayer.html?clipid=2329176123
http://www.cbc.ca/quirks/episode/2013/01/26/january-26-2013/#3
3/14/2013

In Newfoundland, Canada, something odd was found. A coyote roaming the countryside was reported to have a completely white pelt! On top of that, it was found that the coyote was not albino. It was found that this coyote had a gene mutation that is also found in golden retrievers and other red or gold dogs. The mutation shuts off the production of one pigment, namely the dark colour, and that makes the production of another pigment, namely gold or red. That is the case with golden retrievers. With these white coyotes, it seems that the other pigments did not get produced, so what was left was a white coyote. It turns out that this new ‘species’ appeared some time after a coyote and a golden retriever disappeared together during mating season. Scientists believe this is the reason of the white coyote.

Tuesday, February 5, 2013

Lab Report - Weights and Waves

Guiding Question
Does the size and weight of an object determine the size of the waves it makes?

Hypothesis
I think that the size/weight of an object does affect the amplitude of the waves produced.

Variables

  • Controlled: Water, pan
  • Manipulated: Size and weight of objects dropped in
  • Response: Amplitude of waves. 
Materials
Water
Pan 
1 pound weight
2 pound weight
cork
small metal ball

Procedure
  1. Fill pan with water.
  2. First, drop the 1 pound weight in. Record the height of the waves (roughly) in the data table. repeat the process two times. Remove the weight.
  3. Next, drop the 2 pound weight in, and so on. Record all of your observations in the data table. 
DATA TABLE


Item
Trial #1
Trial #2
Trial #3
1 pound



2 pound



Cork



Metal ball




Sunday, January 13, 2013

Wave Lab Report

Data Analysis

When a wave hit another wave, they bumped into each other, yet kept going on their own ways, like nothing had happened. When a wave hit a barrier, the wave would crash into it and would not keep going, because there was something blocking its way, so it would just dispel. If there was a split in that barrier, though, the part of the wave that was heading toward that split would keep going, and the rest of the wave would hit the barrier that was obstructing their path. When a wave hit the other side of the pan, it would just bounce back.

Simulation

In the simulation, I found many things, but quite a few of them were already covered by the lab. One thing that was shown was that the more drops that were dropped, the more waves were created. Also, the bigger the drop, the bigger the waves it creates. The simulation is a great was to find out things about waves.

CONCLUSION

1. When water is dropped from a pipette into a pan of water, how do the waves behave? The waves roll outward, away from the point of impact.
3. How do waves interact with each other and with solid objects in their path? When waves hit each other, they bump into each other, yet then move on and keep moving in their path. When they hit solid objects in their path, they crash into the objects, and that stops their movement.
My hypothesis was somewhat correct, but only somewhat. I wrote that when waves meet, they crash into each other, but not that they move on with nothing changed. I also wrote that when they hit solid objects in their path, they crash into them and find their way around, but that was proven not necessarily true in the lab. The waves crash into the objects and their path is interrupted, so they do not roll anymore. When the waves hit the side of the pan, however, they bounce back.

Further Inquiry

I think there were some things that went wrong, perhaps the time when the waves went under the cork rather that carrying it along with them. I think that's what should have happened. Also, what was interesting was that some water was stuck in the cork after the previous experiment, so that when we put the cork in the pan, the water leaked out of the cork, and, as a result of being in the cork for so long, the water that leaked was yellow. I would really like to find out why, when the waves hit the clay, they did not just bounce back like they did when they hit the side of the pan.

Tuesday, April 24, 2012

H1N1 Essay


H1H1-The Swine Flu
Petra 6A
               In 2009, something dark swept across the world; something dangerous, something… invisible; something new. Many medications and vaccines were prepared, and many were still saved even though many weren’t, falling to this mystery. It flew through coughs and broke through defenses. Descending upon Earth, the H1N1 virus caused deaths and sadness, but also awareness and medicine.
              The H1N1, also called the swine flu, was a new influenza first found infecting people in the U.S., in 2009, and quickly spread, through coughing, sneezing, or talking with someone who was infected with the influenza, and even sometimes by touching something with the flu viruses on it and then touching one’s nose or mouth. It was called the swine flu because it was found similar to a flu virus that had infected pigs, but scientists soon found that it was quite different and infecting people fast. When a person started coughing violently, having fevers, runny or stuffy noses, body aches, chills, and fatigue, they most often had the influenza, or the H1N1. Really bad cases included vomiting and diarrhea, and, sadly, many of the H1N1 cases resulted in death. Many people with other illnesses, such as asthma or heart failure, often became worse if the person with those illnesses was infected by the flu. People often fell to this illness. Death and sickness cascaded on the land when the H1N1 took place.
             Even though the 2009 H1N1 virus was dangerous and life-taking, vaccines were soon developed and were spread across the world.   It was made so that everyone six months and older was recommended to get the vaccine. Everyone had to get the vaccine each season, but certain people were urged to, because they were more at risk, such as pregnant women, children younger than five, but especially children younger than two years old, people 50 years of age and older, people of any age with certain chronic medical conditions, and people who live with or care for those at high risk for complications from flu, including: Health care workers, caregivers for people at high risk for the flu, caregivers of children less than 6 months of age (those under 6 months were too young to get the vaccines). Now, people might ask; “Why do I have to get another vaccine each season? I got one not too long ago”. The answer to that is that the immunity could decline after a while, and it is safer to get another to keep it up. So go and get your vaccines, if H1N1 is coming your way!
           Do you want to know how bad it was? Around 43,771 people in the U.S. were reported infected between April and June 2009 only, and, out of those cases, 5,011 were hospitalized and 302 people died. Though, these reports couldn’t have been too accurate, because some people weren’t very badly affected with the flu, only mildly, and so never sought medical attention. Others got medical attention, but were never tested or diagnosed, and so that means that the count was only a small bit of the true H1N1 attack. It’s estimated that, instead of 43, 771 people, over one million people got infected with the swine flu. That is a lot of people, and a huge loss.
             The H1N1 flu spread across the world, but luckily vaccines came to the rescue and kept many from getting it. This new influenza took many lives, leaving that many families sad. It was terrible, but we were able to help others, keeping others from death. Hopefully, next time the swine flu strikes in full force, we will be ready.
           

Friday, March 23, 2012

Are Viruses Alive? Or not.....?

I believe that viruses, are not alive, and yet they are. They are in between our definitions of living and non-living. They have many characteristics of life, and yet they lack some that would make them technically "alive". For instance; they reproduce (though only through using a cell to replicate itself), they respond to their surroundings, and they grow, but they do not use energy or have their own cells. They are simple beings that use host cells to run their primary functions, and so technically can not "live" on their own. So therefore, they could be alive, but do not have all the necessities of life, and so are kind of in the middle. It is certainly very puzzling...

Resources:
http://serc.carleton.edu/microbelife/yellowstone/viruslive.html 
http://answers.yahoo.com/question/index;_ylt=AjyfHkZ.7arQCjpdnEvtQRAjzKIX;_ylv=3?qid=20080818175050AAVzWEg 

Clostridium perfigens -- Gas Gangrene (Wanted Poster)

 

Sunday, March 11, 2012

Cur. Ev. 3rd Quarter No 1


Current Event
Petra 6A
Science
Mrs. M.
3/8/12
Good Bacteria, Bad Bacteria
             There are so many harmful bacteria, but there are also very helpful bacteria. When bad bacteria are attacking the body and causing sickness, there is the immune system which fights the sickness, but how on earth does the immune system know good from bad? Scientists from the Northwestern University Feinberg School of Medicine have found a special white cell called macrophage, which is one of the first to find the harmful cells and kill them. They found that a protein called “NLRP7” finds out if a bacterium is good or bad. It kind of acts as a little “scout” that searches the different aspects of the bacterium and decides whether it’s good or not. Finally understanding how the body fights these little creatures could lead us to, in the future, maybe solving the problems of brain disease.
My Thoughts
            I think that it is amazing that this has been discovered. I found it really interesting to read, it was a topic that I found myself pulled into, probably because I like to understand things that go on in the world I live in. The fact that we might, one day, be able to cure brain disease excites me, but it also troubles me. Diseases of all sorts are on this Earth for a reason. If we suddenly cured all sicknesses and diseases in the world, not so many people would die! Yeah, I know, you’re probably all thinking: ‘But isn’t that a good thing?’ Well, let me ask you, how many people do we have in the world today? That’s right, 7 billion+. And how many more people would be added to that figure if there were tons of fewer deaths? That’s just something to think about when you’re reading things like this… J

Sunday, November 27, 2011

Cur. ev. 2nd quarter No 6


Petra 6A
Nov. 26 2011
Notes: Dr mike gerbich professor  of biology at u of w on, extremely tiny, feeding on over 1000 different plant species 150 being of agricultural importance, ability 2 develop resistance 2 pesticides, takes genes from other species, ex. Takes gene from bacteria cuz bacteria can break down toxics from plant, when changing mite 2 different hostthe mites genes change completely, can counter pesticides too,

Creepy Crawlies

            There’s a new bug in town. A small pest called the spider mite has been studied by a group of scientists, and many things have been found out. First, it is feeding on over 1000 species of plants, 150 being of agricultural importance. How? It steals genes from other organisms that have the ability to break down the plant’s defensive toxins, thus rendering itself able to do the same. It also has found a way to break down our pesticides. The scientists have found that when you change the mite to a different host plant, its genes change completely to adapt to its new environment. They are still working on how to stop the creepy crawler, but this discovery is a great one.

My thoughts

         I think that if we don’t find a way to stop this mite, it will eat its way through all our agriculture. It is nature’s way, though, for this mite to adapt the way it has. We adapted to live in this world in prosperity; why shouldn’t it adapt to survive? This was a very interesting article for me, and I look forward to learning more about the spider mite.

Monday, November 14, 2011

Cur. ev. 2nd quarter No 5

Petra 6A

http://www.cbc.ca/video/news/audioplayer.html?clipid=2166737038

Nov. 12th 2011

66 Legs of Discovery

In 2000, buried deep in the Burgess Shale located in the Rocky Mountains, an amazing discovery is made: The 3m long track way of an ancient predator known as the Tegopelte. The track ways were about 12-15cm wide, telling to paleontologist Nicolas Minter, who was studying this fantastic creature, that the width of the Tegopelte was 12-15cm. They found that the Tegopelte had 33 pairs of legs and that each track was spaced around 20cm apart. They also found the way that the prehistoric animal walked. It placed one pair of feet down and then quickly raised it up while putting down the one behind it. This method of walking is similar to that of the millipede. The Tegopelte was a predator on the ancient sea floor over 500 million yrs ago.

My Thoughts

I think that it’s really cool to learn about creatures from the past, and that the Tegopelte is a fascinating creature. I enjoyed learning a=everything I could about it.

Sunday, November 6, 2011

Cur. Ev. 2nd quarter No 4


Petra 6A
Saturday November 5th

The Plain-Tailed Wren

            The plain tailed wren is known for an amazing skill. When the female and male are put together, they sing a duet that sounds like one bird! The plain tailed wren is about the size of a starling, and it is brown in colour with a stripe that goes over the eyes.  They live in thick bamboo forests on the sides of the Andes Mountains. They alternate singing with such speed and precision that their song sounds like one. What is also interesting is that the birds sing alone as well. When the female sings alone, there are gaps where the male should be, and vice versa. Scientists found that the duet singing is used mostly for the female to test the male’s ability to sing his syllables in the short span of time she gives him, or to test whether the male is good enough for her or not. Dr. Eric Fortune, of the Department of Physiological and Brain Sciences at the Johns Hopkins U. in Baltimore, conducted brain tests on these amazing animals.  He thought that the strongest memory would be of the cues to tell the bird when to sing, but it was actually the whole duet. Instead of knowing just their part and when to sing it, they knew their partner’s part as well to help them sing theirs. Dr. Fortune also found that you could put a male and a female who were 1 kilometer apart together, and they would learn the duet in only a couple of hours.

                                                                  My thoughts                     

            I think that it is amazing to learn about this incredible creature, and that discovering more and more things about our planet-mates could really help us in understanding our world and how to protect it. Also, it’s just really cool to learn about this stuff.

Thursday, November 3, 2011

Cur. Ev. 2nd quarter No 3

Heart of a Snake
Oct. 29th 2011

The Bermese Python

             The Bermese python barely eats, but when it does, it hunts giant prey, prey that can be as big as the python itself. After killing the unfortunate animal, the python swallows it -- whole. But how? On one episode of Quirks and Quarks, the host Bob McDonald interviews Dr. Leslie Leinwand, a professor of molecular biology at the U of Colorado., about this fascinating animal. She says that digesting the prey would take a lot of digesting, and a normal sized stomach couldn’t handle it. So the python’s organs double in size in only 2 days time. Dr. Leinwand studied this characteristic, and found at least three fatty acids in the python’s blood that made this change possible. She and her colleagues found that this blood could work in other animals. They tested it on healthy mice, and their organs nearly reached twice their normal size. Dr. Leinwand hopes that one day this blood could be used to treat patients with heart disease.

My thoughts

             I think that this discovery is amazing. The Bermese python could be the start of more healthy people and fewer deaths. I am really happy that there would be less deaths, as would many others, but it would create a problem with world population. Think about it: If everyone in the world was completely healthy, and no one could die of sickness, then the world would overflow with people. I only hope that won’t be any time soon