Se muestran los artículos pertenecientes a Febrero de 2012.
Cells are the Starting PointAll living organisms on Earth are divided in pieces called cells. There are smaller pieces to cells that include proteins and organelles. There are also larger pieces called tissues and systems. Cells are small compartments that hold all of the biological equipment necessary to keep an organism alive and successful on Earth.
A main purpose of a cell is to organize. Cells hold a variety of pieces and each cell has a different set of functions. It is easier for an organism to grow and survive when cells are present. If you were only made of one cell, you would only be able to grow to a certain size. You don’t find single cells that are as large as a cow. Also, if you were only one cell you couldn’t have a nervous system, no muscles for movement, and using the internet would be out of the question. The trillions of cells in your body make your life possible.
One Name, Many Types
There are many types of cells. In biology class, you will usually work with plant-like cells and animal-like cells. We say animal-like because an animal type of cell could be anything from a tiny microorganism to a nerve cell in your brain. Plant cells are easier to identify because they have a protective structure called a cell wall made of cellulose. Plants have the wall; animals do not. Plants also have organelles like the chloroplast (the things that make them green) or large water-filled vacuoles.
We said that there are many types of cells. Cells are unique to each type of organism. Humans may have hundreds of types of cells. Some cells are used to carry oxygen (O2) through the blood (red blood cells) and others might be specific to the heart. If you look at very simple organisms, you will discover cells that have no defined nucleus (prokaryotes) and other cells that have hundreds of nuclei (multinucleated). The thing they all have in common is that they are compartments surrounded by some type of membrane.
The cell nucleus acts like the brain of the cell. It helps control eating, movement, and reproduction. If it happens in a cell, chances are the nucleus knows about it. The nucleus is not always in the center of the cell. It will be a big dark spot somewhere in the middle of all of the cytoplasm (cytosol). You probably won’t find it near the edge of a cell because that might be a dangerous place for the nucleus to be. If you don’t remember, the cytoplasm is the fluid that fills cells.
Chinese New Year is an annual festival based on the Chinese calendar. The date varies slightly from year to year. This year, it will be celebrated on 23rd January. Each New Year is named after one of the animals from the Chinese zodiac. 2012 is the year of the dragon, the only mythical animal.
The Chinese hang red lanterns in their homes at Chinese New Year. Why?
Surf in the net to find out and have fun:
Charles John Huffam Dickens (7 February 1812 – 9 June 1870) was an English novelist, generally considered the greatest of the Victorian period. Dickens enjoyed a wider popularity and fame than had any previous author during his lifetime, and he remains popular, having been responsible for some of English literature’s most iconic novels and characters.
Find more about the author of A Christmas Carol, The Tale of Two Cities, Oliver Twist or The Pickwick Papers by visiting the Charles Dickens Page.
El conde Sisebuto de Joaquín Abatí. Composición narrada sobre ilustraciones de Mingote.
Nuestra “carrera solidaria” ha sido un gran éxito
y se han recaudado 4389,68 €.
¡Muchas gracias a todos por vuestra participación!
Every February we celebrate Valentine’s Day by giving flowers, candy and cards to those we love. We do this in honor of Saint Valentine. You may be wondering, "Who is St. Valentine"? Time to brush up on your Valentine’s history!
Legend has it that Valentine was a priest who served during third century Rome. There was an Emperor at that time by the name of Claudius II. Emperor Claudius II decided that single men made better soldiers than those that were married. With this thought in mind he outlawed marriage for young men in hopes of building a stronger military base. Supposedly, Valentine, decided this decree just wasn’t fair and chose to marry young couples secretly. When Emperor Claudius II found out about Valentine’s actions he had him put to death.
Another legend has it that Valentine was an imprisoned man who fell in love with his jailor’s daughter. Before he was put to death he sent the first ’valentine’ himself when he wrote her a letter and signed it ’Your Valentine’, words still used on cards today.
Perhaps we’ll never know the true identity and story behind the man named St. Valentine, but this much is for sure...February has been the month to celebrate love for a long time, dating clear back to the Middle Ages. In fact, Valentines ranks second only to Christmas in number of greeting cards sent.
Another valentine gentleman you may be wondering about is Cupid (Latin cupido, "desire"). In Roman mythology Cupid is the son of Venus, goddess of love. His counterpart in Greek mythology is Eros, god of love. Cupid is often said to be a mischievous boy who goes around wounding both gods and humans with his arrows, causing them to fall in love.
More Valentine’s Day Fun:
to be (am, are, is) + + infinitive
1) planned actions in the future
We singat the party.
2) You are certain that something is going to happen in the future.
Look at this car! It crash into the yellow one.
|I play handball. |
|You play handball. |
You play handball.
|I have a picnic. |
Ihave a picnic.
|You have a picnic. |
You have a picnic.
You have a picnic.
|have a picnic?I||have a picnic?you|
Do not mix up with the Present Continuous!
|going to-future||Present Continuous|
|He’ the book.||He’the book.|
Science videos, lessons, quizzes and games about plants that make learning fun and interesting.
Click on the image to visit the website.
Austrian monk and avid Gardener Gregor Mendel is credited for discovering why tall plants (in his case, pea) don’t always produce tall offspring, nor do smaller plants.
Fun cool facts about Leap Year Day February 29
OK, let’s learn how to say it correctly.
Someone born on February 29 was born on Leap Day,
or Leap Year Day. They were NOT born ON Leap Year.
Leap Year is the year we are in; like 2012 or 2016.
Anyone can be born IN a Leap Year. Leap Year lasts
all year. Leap Day Babies were born ON Leap Day.
THAT is what is rare. In fact, the odds are 1 in 1461!
You don’t have to be born on February 29 to enjoy Leap Day.
|It’s everyone’s extra day!
28 DAYS HAS FEBRUARY
Twenty-eight days has February
A very light load for one month to carry
The other months have 2 and 3 more
Thirty and thirty-one being their big score
In Leap Years the days they do vary
Making 29 days in February
|WHAT DO LEAP DAY BABIES |
We are Leap Day babies,
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