Abstract Dimension stone is natural rock prepared for building use. It rapidly colonised by microorganisms that cause discoloration (mainly cyanobacteria, algae and fungi) structural damage. Microbial mobilisation of ions leads to new superficial or internal deposits, weakening the structure. Cyanobacteria fungi may penetrate, filling pores creating spaces. Lichens, fungus/phototroph associatio...

The in vivo disintegration of luting cements was determined at 6- and 12-month intervals in two test series of 20 participants each. Four cements were inserted in the wells located in the mesial and distal surfaces of cast crowns. Glass ionomer, silicophosphate, polycarboxylate, and zinc phosphate cements prepared with recommended powder/liquid ratios are discussed, and are ranked with respect ...

AFTER DISINTEGRATION BY SONIC VIBRATIONS THE CONTENTS OF THE HEMOLYTIC STREPTOCOCCUS CAN BE SEPARATED BY DIFFERENTIAL CENTRIFUGATION INTO THREE FRACTIONS: an insoluble residue, cytoplasmic particles, and a solution of proteins of smaller unit size. The residue (R) presumably comprises the cell walls of the bacteria and contains the type-specific M protein. The cytoplasmic particles (CP) contain...