Iconographic changes:3 cases showed light patchy shadows along the streak line distribution;1 case showed patchy shadows confluent into a big patchy shadow.
The streak-plate method was used to separate Chlorella colonies.The selected strain, induced by mutation using a laser, was cultured heterotrophically to obtain a high biomass.
Streak cathod method which is a kind of qualitative method for measuring the innerstress of deposits was introduced.A semi-quantitative calculating formula for the innerstress was given.
During two cooling methods, whether tension stress or compression stress, the retained austenite in steel reduced with stress increasing, had become from massive to streak or filminess.