Semantics is the study of meaning. Meaning itself is a broad area of study. It can refer to lexical meaning or structural meaning (the meaning related to the structure of sentence). I will try to give the example of structural meaning. A sentence consists of pragmatic information and semantic information.
PCR stands for Polymerase Chain Reaction, a method for amplifying DNA in vitro. Where, in cloning DNA into a plasmid, the DNA is amplified by the bacterial cell when it replicates the plasmid, PCR amplifies DNA in a test-tube. Cycling temperatures: Of the three temperatures used in a cycle of PCR, the denaturing and extension temperatures remain unchanged for the most part, since most DNA is denatured at 94-95 degrees C, and the temperature optimum for the Taq DNA polymerase lies between 72 and 74 degrees C.
MICR - magnetic ink character recognition. MICR is an acronym for magnetic ink character recognition. it is used in the banking industry for check printing to increase productivity and efficiency. MICR ink and MICR toner is also required by the Federal Reserve to ease check processing.