The terms logical host or cluster logical host is used to describe the network address that is used to access services provided by the cluster. This logical host identity is not tied to a single cluster node. It is actually a network address/hostname that is linked with the service(s) provided by the cluster.
Creating the right environment for growth was the first step in producing enough penicillin to be used as a drug. In Oxford, experiments showed that Penicillium notatum grew best in small shallow containers on a broth of nutrients. Penicillium need lots of air.
It took around 2,000 L of mold culture fluid to create enough pure penicillin to treat just a single case of sepsis in a person. Penicillium notatum simply could not produce enough penicillin. However, another chance discovery on a slice of cantaloupe introduced the group to Penicillium chrysogenum. With some X-ray modifications, they encouraged the fungi to produce 1,000 times the quantity of penicillin that Penicillium notatum had managed.