Light and scanning electron microscope study of nuchal translucency in a normal fetus.
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Biomedical subjects
Publications and source records attributed to G Mattutino.
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An X-ray color imaging system was used to study primer particles and fired bullets from different .22 rimfire ammunition. The technique proved to be very useful, allowing a ready, concomitant analysis of the morphology of primer particles and their elemental composition. The investigation of the bottom of fired bullets showed that antimony present in the bullet alloy is not evenly distributed, but organized in plates made up of almost pure antimony. Moreover, particles and other traces adherent to lead bottomed bullets containing elements different from lead, therefore, useful to the understanding of primer composition are readily and easily detected.
The authors observed, with a scanning electron microscope, the dermal surfaces of experimental wounds, following the enzymatic digestion with trypsin of the dermo-epidermal junction. Cut lesions showed an early reconstitution of the basement membrane and progressive convergence of the margins. A peculiar arrangement of the dermal crests was also observed. In wounds with loss of substance, the complete coating by newly formed basement membrane took longer. There was an early deformation of the holes of hair follicles in the undamaged dermis surrounding the lesion, as well as the appearance of creases that moved toward the center. This process was over within a few days; then the lesion became very small and the holes of the hair follicles reappeared. The results suggest a force of traction bound toward the center of the lesion and acting on the surface, the effects of which on the basement membrane are most evident between the eighth and the 15th days.