Trigeminal nerve - artery contact in people without trigeminal neuralgia - MR study.

Background: Neurovascular conflict is regarded as the most common cause of idiopathic trigeminal neuralgia. It is suspected that a blood vessel in contact with the root entry zone of a trigeminal nerve causes its irritation. The aim of the study was to evaluate how signs of neurovascular conflict can be found in people without trigeminal neuralgia

Material/methods: The study was conducted retrospectively.

[Molecular basis of ion selectivity based on crystalline structure of bacterial channels].

Unlabelled: The principles of ionic selectivity of the two crystallised bacterial ion channels are described. These channels are: the potassium channel KcsA, whose amino-acid sequence is homologous to the eukaryotic voltage--dependent potassium channels and the chloride channel EcClC that is a prokaryotic member of the ClC family of chloride channels.

In Conclusion: although the overall molecular architecture of KcsA is different from that of EcClC, the selectivity filters in both cases show similarities.