Bacteria can be classified in several ways. Learning how they are classified can help us to better control or manipulate them. Here are nine ways in which bacteria are classified. Based on Stain Bacteria a classified as gram positive or gram negative. Gram positive stains purple while gram negative stains pink. The difference is due […]
What are Notifiable Diseases? Infectious diseases are diseases that occurs when pathogens (disease-causing agents) get into our bodies. They are usually in the form of bacteria and viruses but may also include parasites. Consider common diseases that require immunization such as measles, mumps, tetanus and chicken pox. These are all due to infectious pathogens. Some infectious diseases […]
“Do you know how to wash your hands?” I asked one student this question before the start of a sanitation lab, and she looked at me like, “Are you kidding me”? Well it seems so simple, that you would think that everyone knows how to do it. But how many of us do? Not only […]
So far, you have learned how to use a microscope at magnifications of X4, X10, and X40. The next step is to learn how to use the X100 lens. Remember that when viewing through this lens, the specimen will appear 1000 times bigger, i.e., if your ocular lens is a X10. We call this lens […]
Your red blood cells contain special molecules on the surface. These molecules are part of your “self”. Therefore, it is not attacked by your immune system. However, if you get a transfusion with blood containing surface molecules that your body does not recognize, it will treat it as an antigen and destroy the blood cells. […]
The immune system can sometimes overreact, causing moderate to severe discomfort. This article is a brief overview of the four types of hypersensitivity. Type 1 This is an immediate hypersensitivity response due to exposure to an allergen. The person may start swelling or rash may appear soon after exposure. This is due to activation of […]
