A low-energy, low-exposure-rate, guarded-field ionization
chamber system with a sensitive volume of approximately 1040 cm³ and an exposure-rate range from 60 mR/h to less than 0.5 mR/h
was designed, constructed and calibrated. The calibration was
effected by constructing and calibrating a 60 cm³ volume transfer
chamber of similar design against...
Cathepsins are intracellular proteinases that hydrolyze the
peptide bonds of proteins. These enzyme have been implicated in
the tenderization of aging beef, with the deterioration of radiation-stabilized
meats on storage, and in the spoilage of fish prior to
processing. Hence, the cathepsins of edible muscles are of concern
to the...
The spermiogenesis of Mytilus edulis (a marine mussel) has
been studied, employing techniques of light and electron microscopy
and cytochemical preparations. The observations trace the development
of the acrosomal complex, the nucleus, the mitochondrial
middle-piece, and the flagellum.
In early spermatids numerous membrane-bounded proacrosomal
vesicles arise from several Golgi complexes...