the t d t curve influence of temperature on the decimal reduction time to pass through one logarithmic unit t 2 t 1 temperature of treatment in degrees c and d 1 d 2 time of decimal reduction in minutes at the corresponding temperatures table 1______________________________________heating temper d min heating tem ature u00b0 c b licheniformis b subtilis perature u00b0 c ______________________________________91 120 40 8796 22 26 90100 6 7 95105 3 5 6 97z 8 9 11 2 u00b0 c ______________________________________ heat resistance in phosphate buffer 0 1 m ph 7 0 of spores of bacillus licheniformis no cncm 1 079 and of bacillus subtilis var niger table 2______________________________________heating tem b licheniformis heating tem b subtilisperature u00b0 c d min perature u00b0 c d min ______________________________________40 15 40 3945 73 50 1850 37 60 5 255 20 70 360 12 80 0 8270 5 6 480 1 6z 21 5 20 u00b0 c ______________________________________ destruction of spores of bacillus licheniformis no cncm 1 079 by compoun a 0 9 ph 7 0 and of bacillus subtilis var niger by compound a 2 7 ph 7 0 this shows that the effect of compound a compared with heating alone diminishes with increasing temperature the survival curve is the curve which shows the logarithm of the number of surviving spores as a function of the heating time at a given temperature under.