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[Dispersion of asbestos fibers and artificial mineral fibers (MMMF) inside truck cabs: a possible exposure of truck drivers].

Tests on samples of braided asbestos cord used in truck exhaust systems revealed a constant presence of chrysotile. Amosite fibres were also observed in many of the samples. Following a case of asbestosis in a truck driver, it was assumed that asbestos fibres could reach the driver's cab through the openings of the ventilation and heating system and also through the spaces between the bonnet and the floor of the driver's cab. Dust samples taken in the driver's cab of 10 (no.) trucks revealed the presence of asbestos fibres in 3 cases; MMMF were present in 7 cases, very likely originating from the noise insulation panelling. It is therefore suggested that there is a possible risk for truck drivers of exposure to asbestos and MMMF fibres dispersed inside the driver's cab.

Asbestos↗
PubMedDate not supplied

[The effect of pyrophosphate on the rigor fibers of rabbit m. psoas fibers].

The effect of MgPPi on the rigor force of glycerinated fibres in the range of ionic strength 75-250 mM at two temperatures 18 degrees and 5 degrees C was studied. At 18 degrees C the maximum of this effect was above the range of average ionic strength. At 5 degrees C the greatest effect of MgPPi was observed at low ionic strength.

Animals↗
PubMedDate not supplied

[Tension response in skinned Ca-activated skeletal muscle fibers of the frog to temperature jump following stepwise changes in the fiber length].

Joulean temperature jump from 4-7 degrees to 20-25 degrees completed in 0.2 ms was applied to suspended in the air chemically skinned Ca-activated (pCa = 5.5-6) skeletal muscle fibres of the frog 2 ms after stepwise length changes (duration 0.3 ms, amplitudes --6. +3 nm per half sarcomere). The temperature jump induced a biphasic rise of tension, as was described earlier. Neither the time constant of the 2nd slow phase, nor maximum tension after the temperature jump were dependent on the length step amplitude. The amplitude and time constant of the 1st phase (1.2-0.28 ms) decreased after the fibre release. It shows that the 1st phase of the tension rise induced by the temperature jump is due to conformation in cross-bridges attached to thin filaments.

Animals↗