With this technique we can study how cells work, grow viruses and identify them, do genetic studies, and make hybridomas. Even slices of tissues as brain tissue can be kept alive for a short period of time, but long enough to study. Biochemical Analysis Numerous chemicals can be measured from ground cells and tissues and sometimes from microtomed cells. Nitrogen balance, NAD, NADP, DNA, RNA, etc. can be estimated in situ . Chromatography can separate out chemicals such as proteins, amino acids, etc.
Electrophoresis also separates chemicals by weight and electrical properties.
Gases or anything that can be made into a gas can be quantified by mass spectrometry. Isolated Organs and Organ Systems Hearts can be studied in isolation and the effects of chemicals on them has produced a great deal of information. Animal Behavior Behavior can be both genetically and environmentally determined. It is certainly important in evolution. Breeding behavior, care of the young, animal language, bonding are all very interesting aspects of behavior.