Pathogenic microorganisms associated with Ready-to-Eat fresh-cut vegetables and referred to in the model may include Listeria monocytogenes, Salmonella. , Shigella. , Escherichia coli O157:H7, viruses (Hepatitis A virus, Norovirus, and Rota virus), and parasites (Cyclospora. and Cryptosporidium. ).
An isotope is a form of a chemical element whose atomic nucleus contains a specific number of neutron s, in addition to the number of proton s that uniquely defines the element.The nuclei of most atom s contain neutrons as well as protons.n atom of carbon-14 contains 6 protons and 8 neutrons and is denoted 14 C. Over time, 14 C decays into 12 C. Sometimes the isotope of an element is denoted by writing the nucleon number after the chemical symbol, and not as a superscript.
Isotopes are atoms of same kind (protons/electrons) but different number of neutrons, then different mass, they might be natural or manmade (deuterium and tritium are examples for both conditions for hydrogen), when they are natural the periodic chart shows a rational mass number where the fractional part gives a proportion of natural occurrence of ...