1. INTRODUCTION We know that the microorganisms are livings things, but... What are they? They are harmful or usefull? What they produce? We are going to know about the really world of the microorganisms.

2. Microorganisms Microorganisms are unicellular or multicellar organisms, that are microscopic. The study of the microorganisms is called microbiology. There are microorganisms: - Bacteria. - Archaea. - Plakton. 3. Where they live? Microorganisms have inhabited the earth longer than any other being. They were developed when the Earth was a mass of lava, boiling water, methane, ammonia and other gases. 4. Microorganisms Humans have been using microorganisms for thousands of years to make products they need and enjoy, for example they use fungi to make cheese, yeast for bread, Lactobacillus bulgaricus for the yogur, etc... 5. Antibiotics Since the first antibiotic was discovered in 1928, many more have been developed and used to treat bacterial infections. Some bacteria have mutated and become resistant to antibiotics, but new drugs are constantly being developed and tested. The first antibiotic, penicillin, was discovered by Alexander Fleming in 1928. 6. What is a microbe? They are the oldest form of life on earth. Microbe fossils date back more than 3.5 billion years to a time when the Earth was covered with oceans that regularly reached the boiling point, hundreds of millions of years before dinosaurs roamed the earth. 7. Some examples of useful microorganisms Lactic acid bacteria.Photosynthetic bacteria.Ferrmenting fungi.Yeasts.Rhizobium.Penicillin. 8. Yeast Yeasts are eukaryotic microorganisms classified in the kingdom Fungi, with 1,500 species currently described.Yeasts are unicellular. Yeasts, like all fungi, may have asexual and sexual reproductive cycles. The most common mode of vegetative growth in yeast is asexual reproduction by budding. We can do some diferents aliments or drinks with the yeast: Beer, Bread, Nutritional supplements, wine... 9. Some examples of harmful microorganisms Escherichia Coll.Mycobacterium Tuberculosis.Streptococcus mutans.Salmonella enterica.Chiamydophila pneumonlae. 10. Chlamydophila pneumoniae Chlamydophila pneumoniae is a species of Chlamydophila bacteria that infects humans and is a major cause of pneumonia. . In addition to its role in pneumonia, there is evidence associating C. pneumoniae with atherosclerosis, Alzheimer's disease and with asthma. The full genome sequence for C. pneumoniae was published in 1999. C. n. This atypical bacterium commonly causes pharyngitis, bronchitis and atypical pneumonia mainly in elderly and debilitated patients but in healthy adults also. 11. Some Diseases and Infections Caused by Microbes Athlete's footChickenpoxCommon coldDiarrheal diseasesGenital HernesMalariaTuberculosisVaginal Infections 12. Tuberculosis Tuberculosis is a contagious bacterial infection that mainly involves the lungs, but may spread to other organs. The most important species of bacteria causing tuberculosis and representative is Mycrobacterium tuberculosis or Koch bacilius. The classic symptoms of tuberculosis are a chronic cough with blood-tinged sputum, fever, night sweats and weight loss. 13. Bibliography http://blog.uchceu.es/veterinaria/dia-europeo-para-el-uso-prudente-de-antibioticos-en-eurohttps://www.google.es/searchhttp://en.wikipedia.org/wiki/Microorganismhttp://kidshealth.org/http://www.bbc.co.uk/bitesize/ks2/science/living_things/microorganisms/read/1/http://www.childrensuniversity.manchester.ac.uk/interactives/science/microorganisms/michttp://www.earthlife.net/prokaryotes/disease.htmlhttp://www.ducksters.com/science/bacteria.phphttp://science.blurtit.com/130382/which-are-the-useful-microorganisms-name-them-and-th 14. Index 1-Introduction2-Microorganisms3-Where they live?4- Microorganism5-Antibiotics6- What is a microbe?7-Some examples of harmful microorganisms8-Yeast9- Some examples of harmful microorganims