He pointed out several additional possible mechanisms, and more to the point, why they and some of Ruddiman's proposals probably wouldn't work.

However, there is an additional mechanism that can lead to the active state in the absence of ligand.

Resistance may be added by having the spinning rollers driving some additional mechanism such as a fan.

But this is not evidence for an additional hereditary mechanism.

No additional mechanism is in place to direct the young parents to other day-care providers.

This heat produces an additional mechanism for melting ice/snow.

There was an additional mechanism in place that could be turned on to give the appearance of clouds moving across the sky.

The Plan 9 operating system pushed this model even further and eliminated the need for additional mechanisms.

An additional mechanism was provided during the war years by the neighbourhood associations (tonarigumi ).

Finally, some of the Foundation's activities are subjected to additional mechanisms of control.