BIOLOGY

What is TEM and SEM? Transmission electron microscopy (TEM) is a [|microscopy] technique whereby a beam of [|electrons] is transmitted through an ultra thin specimen, interacting with the specimen as it passes through. An image is formed from the interaction of the electrons transmitted through the specimen; the image is magnified and [|focused] onto an imaging device, such as a [|fluorescent] screen, on a layer of [|photographic film], or to be detected by a sensor such as a [|CCD camera]. The Scanning Electron Microscope (SEM) is a microscope that uses electrons rather than light to form an image. The SEM has a large depth of field, which allows a large amount of the sample to be in focus at one time. The SEM also produces images of high resolution, which means that closely spaced features can be examined at a high magnification. What are the functional and technical differences between SEM nad TEM?

In functional we can say that they are practically the same, because both of them work with electrons and their objective is to do the images of the tiniest objects in high resolution, but in technical we have differences. SEM works with electrons and Magnets to do the image in high resolution, while TEM works with the transmission and interaction of electrons with the sample. In SEM the magnets act as glass in light microscopes in TEM is a quickly interaction.

DEADLINE: Friday, July 3rd 1. Compliance with the deadline. 2. Compliance with the minimum number of words. 3. Quality of Analysis. **Personal ****analysis ** In the World there is a lot of global warming, the main causes are: INDUSTRIES, but also there are some others causes like us… We are the most POLLUTERS because we are the ones that do all the industries, the ones that smoke and the ones that ignorance the place were we live… OUR HOME THE EARTH. There are many causes like causing global warming with the emission of greenhouse gases, the drastic increase in the emission of CO2 (carbon dioxide), by burning fossil fuels this increase the amount of CO2. The evidence that humans are causing global warming is strong, but the question of what to do about it remains controversial.(111)  **The car you drive: the most important personal climate decision ****, ** when you buy your next car, look for the one with the best fuel economy in its lass, plant ** a tree ****,** you can also make a difference in your own backyard, get a group in your neighborhood together and start planting trees.  **Buy good wood, ** when buying wood products, check for labels that indicate the source of the timber.** Look for Energy Star, **when it comes time to replace appliances, look for the Energy Star label on new appliances (refrigerators, freezers, furnaces, air conditioners, and water heaters use the most energy ). 
 * Prepare a personal analysis from the information you heard during the debates and describe the main causes and consequences of global warming and its effects over the world biodiversity, with special attention to the biodiversity in Peru.
 * Propose possible solutions that people your age could start doing to prevent the global warming effects.
 * Publish it in your personal wiki with YOUR OWN WORDS, with a minimum of 200 words and a maximum of 250 words. **
 * Cite your sources of information **.
 * Evaluation Criteria: **
 * 4. Actions and Solutions suggested **** . **