21. The new CBTC system will instead maintain a fixed distance of empty space ( a moving block ) between trains. 22. Thus the dimer acts as a " molecular handcuff ", locking their binding partners at a fixed distance and orientation. 23. SATB1 organizes the MHC class-I locus into distinct chromatin loops by tethering MARs to nuclear matrix at fixed distances . 24. These cameras time vehicles over a known fixed distance , and then calculate the vehicle's average speed for the journey. 25. Grenz rays are absorbed by air and therefore treatments must be given at fixed distances for which the machine has been calibrated. 26. The set of points at a fixed distance from one given point is a " sphere ", in a generalized sense. 27. When performing an experiment, one measures the temperature at a point at fixed distance , and follows that temperature in time. 28. The shaft liner does not reach right to the bottom of the shaft during sinking, but lags behind by a fixed distance . 29. To measure height, the user of the Biltmore stick stands a fixed distance from the tree, usually in the United States. 30. Cars in different lanes could race, but cars in the same lane moved at the same speed, separated by a fixed distance .
