Persimmon tannin powder (IMAGE) Osaka Metropolitan University Caption This powder was used to create the supernatant that showed some beneficial antioxidative properties that help yeast grow. Credit Osaka Metropolitan University Usage Restrictions News organizations may use or redistribute this image, with proper attribution, as part of news coverage of this paper only. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.