Noun
English Wikipedia has an article on:ultrastructureWikipedia
ultrastructure (countable and uncountable, plural ultrastructures)
(biology) The fine, detailed structure of a biological specimen that can only be observed by electron microscopy
However, Gram staining response of bacteria is an empirical criterion; it is based on the marked differences in the ultrastructure and chemical composition of the two main kinds of prokaryotic cells that are found in nature. Source: Internet
Types A modern transmission electron microscope Neonatal cardiomyocytes ultrastructure after anoxia-reoxygenation. Source: Internet
However, although Gram staining response is an empirical criterion, its basis lies in the marked differences in the ultrastructure and chemical composition of the bacterial cell wall, marked by the absence or presence of an outer lipid membrane. Source: Internet