Nitrogen Metabolism in Potato Tubers: Dr. Don Dinkel, who views a potato as a 'convenient little package' which is tailor-made for scientific study, has probably asked more questions than he has answered in his experiments with centrifugalized tubers. He has determined some interesting facts. -- Vapor Barriers in Alaska Construction: Viewing Alaska as a giant refrigerator, C. Ivan Branton was able to prove to homebuilders that they were losing valuable heat when it wasn't necessary. He showed them how to stop the loss and his recommendation is now a building standard in the state. -- Grain Breeding for Better Cereals: Research agronomist Roscoe Taylor has a project which may never be completed, but progress is the name of his game. With problems in genetics and Alaska's harsh environment, Taylor faces a twin challenge. -- An Ounce of Potassium Is Worth a Pound of Potatoes: When commercial potato growers in the Matanuska Valley began to lose their crops, a team of scientists stepped in and found a fertilizer which solved the problem. -- Solving a Pair of Problems in Mink Ranching: Steatitis and cotton fur are two of the mink rancher's most feared enemies. They once posed a problem in Alaska, but thanks to the work of Jim Leekley in Petersburg, they no longer cause trouble .