| A | B |
|---|
| PSYCHROPHILE | COLD-LOVING--MAY REQUIRE TEMPS BELOW 15 CENTIGRADE |
| PSYCHOTROPH | PREFERS TEMPS 20 - 30 CENTIGRADE |
| MESOPHILE | MODERATE TEMPS--25 - 40 CENTIGRADE |
| THERMOPHILE | HEAT-LOVING MICROBES--50 - 60 CENTIGRADE |
| EXTREME THERMOPHILES | TEMPS ABOVE 80 CENTIGRADE |
| HALOPHILE | TOLERATES HIGH SALT CONCENTRATIONS |
| OBLIGATE HALOPHILE | REQUIRES AN EXTREMELY HIGH SALT CONCENTRATION TO GROW--POSSIBLY 30% |
| BAROPHILE | REQUIRES HIGH HYDROSTATIC PRESSURE (AS IN THE DEPTHS OF THE OCEAN) |
| IDEAL pH FOR MOST BACTERIA | 6.5 - 7.5 |
| IDEAL pH FOR FUNGI | 5 - 6 |
| ACIDOPHILE | PREFERS AN ACID pH |
