RESPIRATORY GRADIENTS IN TUBULARIA

Chemotactic Turning Behaviour of Tubularia Spermatozoa

Chemotaxis of spermatozoa to female gonophores has been shown to occur in Campanularia, Tubularia and other hydroids (Miller, 1966 a, b). Cinemicrographic records of the movements of Campanularia spermatozoa in the vicinity of female gonophores or of glass capillary pipettes containing extracts of female hydranths have shown that chemotactic aggregation of the spermatozoa occurs because the spe...

Inhibition of pacemaker systems in the hydroid Tubularia.

A number of phenomena have been described in Cnidaria which indicate that inhibition is one of the factors controlling behaviour in these, the most simply organized living animals with indisputable nervous systems (Table 1). Although the presence of inhibition in a number of species of Cnidaria is well documented, in no case is the mechanism of inhibition understood. An example of inhibition wh...

The time course of pacemaker inhibition in the hydroid Tubularia.

BK Polyomavirus in Respiratory Specimens of Patients with Respiratory Disease

Background and Aims: The role of BK and JC polyomaviruses (BKV and JCV) in the causation of respiratory disease and the natural route of transmission has not well been established. The aim of study was to determine the prevalence of BK and JC viruses in 280 respiratory samples and evaluate their contribution to respiratory disease. Materials and Methods: PCR was used to screen specimens for BK...

Mitochondrial respiratory control can compensate for intracellular O(2) gradients in cardiomyocytes at low PO(2).

In isolated single cardiomyocytes with moderately elevated mitochondrial respiration, direct evidence for intracellular radial gradients of oxygen concentration was obtained by subcellular spectrophotometry of myoglobin (Mb). When oxygen consumption was increased by carbonyl cyanide m-chlorophenylhydrazone (CCCP) during superfusion of cells with 4% oxygen, PO(2) at the cell core dropped to 2.3 ...