spontaneous generation; abiogenesis; natural occurrence; spontaneous occurrence
explosive increase (in number of pests); (severe) outbreak or upsurge of pests
frequency; rate of occurrence
mass outbreak (of a disease)
calorification; thermogenesis
gas generation; gasification
embryogenesis; embryogeny; embryonic development
Japanese Society of Developmental Biologists; JSDB
polygenesis; polyphylesis
ultrasonic generator; sonicator