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...ve speculated that the tube-like struc- tures in these electron microscope images may be microscopic fossils of primitive, bacte... ...included the following protocols: • Direct sample observations. Optical microscopes using visible and infrared light sources as well as electro... ...croscopes using visible and infrared light sources as well as electron microscopes were used to search for life-forms. • Bacteriology. Atte... ...e. Equipment designed for operating through the biologic barrierincluded petrographic microscopes, stereoscopic binocular micro-scopes, balances, a ... ...t designed for operating through the biologic barrierincluded petrographic microscopes, stereoscopic binocular micro-scopes, balances, a gas compariso... ... not determine the structures and char-acteristics of rock fragments using microscopes, they employed ana-lytical methods such as x-ray diffraction or...