Thursday, October 27, 2011

Kind of Microscopes

Compound Light Microscope, a microscope that allows light to pass through a specimen and uses two lenses to form an image.
  • Compound light microscope is cheaper thatn any of the two electron microscopes
  • It is more portable and didn't rely on electricity
  • It is movable since it is not too big
  • can observe living cell
  • colorful image
  • Has a less magnification compared to electron microscopes
  • Need to adjust the light first every time we are going to use it
  • can't observe things that are really small

There are 2 kinds of electron microscopes. Transmission electron microscopes and Scanning electron microscopes. Transmission electron microscope is a microscope that shine a beam of electron to reveal a wealth of detail inside the cell. Scannig electron microscope is a microscope that scan a narrow beacm of electrons back and forth acroos the surface of a specimen to produce realistic, and often dramatic, 3-d images of the surfaces of projects.
Transmission Electron Microscope
 Scanning electron microscope
Pros :
  • has a way bigger magnification compared to light microscope
  • can provide more detail and a more dramatic image compared to light microscope
  • can be connected to a computer and use it to analyze the data in monitor
  • can only observe dead cell
  • black and white cell
  • rely on electricity
  • not movable because of the size

source : (biology textbook and google search for the images)

Kind of Nutrients

1. Carbohydrates, used as the main source of energy in the body. We can get carbohydrates from foods that contain sugars or starches. Carbohydrates are processed by amylase. Examples of food that contains carbohydrates are breads, pastas, grains, rice, and etc.
(reference: bio textbook and google search for image)

2. Proteins, used as biological catalyst that speed up chemical reaction that take place within human body. It also has regulatory and transoport functions. Take for example, insulin is a protein that regulatres the level of sugar in the blood, and hemoglobin is a protein in red blood cells that help the blood transport oxygen. We can find proteins in meat, chicken, beef, fish, beans, and etcetra.
(reference: bio textbook and google search for image)

3. Lipids, used to store extra energy and insulate the body. Lipids also produce cell membranes, myelin sheaths, and certain hormone. We can get lipids from animal fat and vegetable fat. Examples for animal fat are cheese and butter. Examples for vegetable fat are avocados, beans, etc.
(reference: bio textbook and google search for image)

4. Vitamins, used to help regulate body process.Often times, it working together with enzymes. There are two kinds of vitamins; one that is water soluble and one that is fat soluble. B and C are water soluble while A, D, E, K are fat soluble. We can find vitamins from eating various kinds of vegetables, fruits, and dairy products.
(reference: bio textbook and google search for image)

5. Mineral, used to fulfill the body needs, usually in small amount. Some examples of minerals are calcium, iron, and magnesium. Calcium is a major component of bones and teeth. Iron is needed to make hemoglobin. We can find minerals by eating a variety of foods because minerals are found in the living tissues of plants and other animals.
(reference: bio textbook and google search for image)

Sientific Method

link to my scientific method wordle ^o^

Objective is what are we going to discover, do, or prove

Hypothesis is what we think might happen throught the test

Manipulated Variable is variable that we compare in a set of test
Responding Variable is variable that emerge as result of the manipulated variable

Procedure is the steps other people have to do in order to repeat this experiment exactly the same

Data is a chart of numbers or bunch of pictures or descriptions in result of the test we do

Analysis is a mathematical calculation, most of the times are formed in a graph, or pictures that we draw or shot with a camera

Pie Graph is a kind of graph when we compare more than one variables with the whole unity of variables
Bar Graph is a graph in which we compare dependent variable by independent variable
Line Graph is a kind of graph when we need to know the rate of dependent variable

Possible sources of errors are unconsidered problems that might effect the result of an experiment, oit could be procedural or measurement errors

Conclusion is the final decision that started by restating our hypothesis and show whether our hypothesis is supported or not through the experiment we do