I'm afraid this is really, really obscure. There was a short story published sometime in the early 1970s (or possibly even before) that involves a moon base that is informed of an impending visit by an important dignitary from Earth whose diet absolutely requires real cow's milk. The organizers on Earth forget to include milk in the provisions sent with the rocket carrying him to the moon, and the moon scientists are forced to synthesize milk by jerry-rigging the equipment and supplies at their disposal. It's brilliantly written, and very funny. Considering the biotechnology aspect (the process is very detailed in the story), it should have been written by Isaac Asimov, but I can't find a reference to it anywhere. I've actually been looking for this story since 1978--in vain. I've Googled it to death, but to no avail. Thanks.