Genetic characterization of a gene for prolipoprotein signal peptidase in Escherichia coli.

A mutation (lspA, prolipoprotein signal peptidase) rendering the prolipoprotein signal peptidase temperature-sensitive in Escherichia coli has been analyzed. The mutation was mapped in the dnaJ-rpsT-ileS-dapB region by interrupted mating with various Hfr strains and P1 phage transduction. lambda transducing phage lambda ddapB2 that carries the rpsT-ileS-dapB region was shown to complement the lspA mutation.

Desmoplastic fibroma of the mandible: report of case.

Desmoplastic fibroma of the bone is a rare tumor; only 48 cases of the disease have ever been reported. The tumor has most often been observed in the metaphysis of long bones. Nine cases of the lesion have been reported in the mandible.

Three-dimensional observation of the temporomandibular joint disk in the rhesus monkey.

The three-dimensional ultrastructure of the TMJ disk of two normal rhesus monkeys was investigated using the SEM. The upper and under surface of the TMJ disk consists of a close network of delicate collagen fibrils. On the undersurface, they have an undulating configuration, with the elevations running in one direction.