In medicine, there are four levels of care: primary, secondary, tertiary, and quaternary. The levels of care refer to the complexity of the medical cases that healthcare providers treat and the ...

All industry is made up of four sectors that are a linked together like a chain: primary, secondary, tertiary and quaternary industry. Industries in the primary and secondary sectors are the ...

All industry is part of a chain that starts with primary ... and secondary industry: the processing of these raw materials into usable products. Next in the chain come tertiary and quaternary ...

Figure 1: Common strategy for preparing chiral tertiary alcohols ... chiral functional group (secondary alcohols) into the most difficult to obtain chiral entities—quaternary stereogenic centres ...

There are three main types of wound healing, known as primary, secondary, and tertiary wound healing. Every wound goes through various stages of healing, depending on the type of wound and its ...