Abstract

Conventional lung preparatory methods for electron microscopy utilizing chemical fixation, dehydration, embedding and/or drying have been critical for understanding alveolar structure. However, these procedures cause the removal of all fluids, alteration of dimensions, and distortion of sp. tial relationships and therefore limit the information that can be obtained. Freeze fracture replica techniques, on the other hand, have provided information on frozen hydrated alveolar structures, but replica procedures require removal of all tissue and cannot preserve the convoluted topography of entire inflated alveoli. Described here is an alternative lung preservation method for use in freeze-fracture, low temperature scanning electron microscopy (SEM) which preserves alveoli in the frozen-hydrated state and permits direct observation of entire inflated alveoli.

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