At the object level . Permissions allowed or denied at the object level apply to the entire object. For example, you can set an object-level permission on an OU object that allows a particular group, such as Account Operators, to create child objects in the OU. At the property level .
Ball mills are used in chemistry and in industry to grind hard solids to a very fine powder. They are very similar to rock tumblers. Basically, the idea is to rotate a container filled with heavy metal balls that crush the substance that you want to grind.
How is chemistry used in forensic science? Chemistry is a valuable tool in forensic science that helps uncover  information from physical evidence. In criminal cases, chemists  analyze substances such as blood, DNA aâ¦nd gunpowder residue to  determine when and by whom the crime was committed.