In 1970, the number of HMOs declined to fewer than 40. Paul M. Ellwood, Jr., often called the father of the HMO, began having discussions with what is today the U.S. Department of Health and Human Services that led to the enactment of the Health Maintenance Organization Act of 1973.
How is Nutrient Broth (microbiology) abbreviated? NB stands for Nutrient Broth (microbiology). NB is defined as Nutrient Broth (microbiology) very rarely.
â¢ NB (noun). The noun NB has 2 senses: 1. a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium. 2. a Latin phrase (or its abbreviation) used to indicate that special attention should be paid to something.