Abstract: Disclosed herein is an efficient, high speed production scale synthesis method for high molecular weight organic substances, such as DNA. The invention includes a method of conducting a polymerase chain reaction which comprises transporting a liquid through polymeric tubing disposed through a first reaction cycle region and at least a second reaction cycle region, each of which regions comprises at least a first and a second temperature zone, the temperature in each zone of said at least second region being substantially identical to the corresponding first and second zones in said first region, wherein said liquid is an aqueous solution comprising polymerase chain reaction reactants and a surface absorbing polymer.

Abstract: Disclosed herein is an efficient, high speed production scale synthesis method for high molecular weight organic substances, such as DNA. The invention includes a method of conducting a polymerase chain reaction which comprises transporting a liquid through polymeric tubing disposed through a first reaction cycle region and at least a second reaction cycle region, each of which regions comprises at least a first and a second temperature zone, the temperature in each zone of said at least second region being substantially identical to the corresponding first and second zones in said first region, wherein said liquid is an aqueous solution comprising polymerase chain reaction reactants and a surface absorbing polymer.

Abstract: A motion sensing safety interlock which disables one or more equipment elements of a ground-traveling machine upon stopping or slowing of the machine below a preselected ground speed. A speedometer cable interconnects a wheel of the machine and a monitor box in which is mounted for rotation by the cable a ferrous star wheel. Lobes of the star wheel pass between poles of a magnetic reed switch which changes state at a frequency corresponding to the rotational speed of the wheel. Electrical circuitry monitors the reed switch and disengages an electric clutch to stop the equipment elements upon the stopping of ground travel of the machine.