Microorganisms, Food Safety HACCP - Encounter Bay on the 微生物，食品安全amp；HACCP遭遇湾上.ppt

Microorganisms, Food Safety HACCP What is a Microorganism? Microorganisms (microbes) are viruses, bacteria and fungi They are too small to be seen with the naked eye, but can be seen with a microscope They are single celled organisms Where Do Microbes Live? Microbes live in the water you drink, the food you eat, and the air you breathe. Right now, billions of microbes are swimming in your belly and mouth, and crawling on your skin! Are Microbes Harmful? 95% of all microbes are harmless Some are very beneficial to humans Bacteria in people’s intestines help to digest food Some harmless microbes protect people by competing with harmful microbes for space How do Microbes Multiply? Some Common Harmful Bacteria in Food Salmonella E.Coli 0157:H7 Why are Space Scientists Concerned about Microbes? Seven astronauts (each with their own microbes) will be living in small, air-tight space for months or years Harmful microbes can spread and make the crew sick Aspects of spaceflight are known to weaken the human immune system Certain microbes can attack the materials and hardware of the Station What is NASA Doing to Eliminate Harmful Microbes in Space? Testing each crewmate for infection before launch Only healthy crew members are allowed to fly in space What About the Water and Air? Air, water and surfaces with which crew members interact must be kept clean All air in the space station will pass through filters-High Efficiency Particle Air (HEPA) filters Water will be disinfected by a machine called a Catalytic Oxidator Protecting Space Station Materials Some harmful microbes can thrive on the Space Station Eventually, they could eat away at the Space Station material Protection of the Space Station Materials Humidity of the air will be kept low Astronauts will clean materials Paint with a fungus-killing chemical will be used How can we control microbial growth here on Earth? NASA Spin-offs Dozens of NASA Spin-offs have improved our lives here on Earth In order to