One of the differences that is noticeable in a very comparison of viruses and bacteria could be the height and width of the microorganism. Viruses less complicated smaller than bacteria. A typical virus is between 20 and 400 nanometers, while a bacterium can be as large as 1000 nanometers. The smallest bacteria are generally visible having a light microscope, while viruses require an electron microscope for observation. You have no idea just how much the efficiency and function of your appliances and installations depend upon how clean these are. Here is a great example on what the general cleanness of your furnace filter can in fact improve how your property is heated over the winter season. A dirty furnace filter's a recipe for the cold home, but large energy bills nonetheless. Do yourself a favour and learn to clean and change a filter, to help you avoid these issues. A progesterone blood test is done to find out how much of the progesterone hormone is in a sample of blood. This female hormone is produced each time a mature egg is released from an ovary after a process referred to as ovulation. This hormone really helps to prepare the endometrium (uterine lining) to take the egg if sperm fertilizes it. If the egg goes without being fertilized, menstrual bleeding occurs and progesterone levels drop.