Molecular cloning and characterization of hetR genes from filamentous cyanobacteria.

HetR, a serine type protease, plays an important role in heterocyst differentiation in filamentous cyanobacteria. We isolated and sequenced the hetR genes from different heterocystous and filamentous nonheterocystous cyanobacteria. The hetR gene in the heterocyst forming Anabaena variabilis ATCC 29413 FD was interrupted by interposon mutagenesis (mutant strain WSIII8).

[Head injuries (author's transl)].

The majority of mortalities after car accidents are due to head injuries. These are followed by injuries to the thorax, abdomen, and extremities. Correctly used seat belts may prevent up to 70% of the head injuries and decrease the effects of other injuries as well.

Multicentric glioblastomas. Methods of diagnosis and treatment.

Although multicentric glioblastomas are relatively rare, their occurrence is not an extreme rarity. A multicentric lesion should always be thought of when the symptoms cannot be related to a single focus and when the special investigations do not confirm a single lesion. In our opinion the brain scintigram and the computer tomogram offer the best diagnostic possibilities at present.