The scientist' s understanding of the cell at the molecular level has
advanced rapidly over the last twenty years. This improved understa- ing
has led to the development of many new laboratory methods that
increasingly allow old problems to be tackled in new ways. Thus the
modern scientist cannot specialize in just one field of knowledge, but
must be aware of many disciplines. To aid the process of investigation,
the Methods Molecular Biology series has brought together many protocols
and has highlighted the useful variations and the pitfalls of the
different methods. However, protocols frequently cannot be simply taken
from the shelf. Thus the starting sample for a chosen protocol may be
unavailable in the correct state or form, or the products of the
procedure require a different sort of processing. Therefore the
scientist needs more detailed information on the nature and requirements
of the enzymes being used. This information, though usually available in
the literature, is often widely dispersed and frequently occurs in older
volumes of journals; not everyone has comprehensive library facilities
available. Also many scientists searching out such information are not
trained enzymologists and may be unaware of some of the parameters that
are important in a specific enzyme reaction.