I got two hours of sleep a day, which is not enough, although four hours would be sufficient. In order to get more sleep this time I'm going to try to reduce the amount of air-traffic control communication that I have to do, so that I'm not constantly on the radio. NOVA: Your last flight lasted a little over six days.
Alpha and beta glucose differ in stereochemistry at one single carbon. In the alpha-form, a bulky group is in a so-called axial position, and in the beta-form, the group is in a more favourable equatorial position. These different positions lead to different bonds in polysaccharides, giving rise to a need for different enzymes to digest them.
The structures are almost identical, except that in the Î± form, the OH group on the far right is down, and, in the Î² form, the OH group on the far right is up. These differences occur at the 1st carbon atom. They are a class of stereoisomers called anomers. Anomers are capable of interconverting in solution. All cyclic structures of monosaccharides exhibit both the anomeric forms. Beta-glucose is more stable than alpha-glucose. When alpha-glucose molecules are joined chemically to form a polymer, starch is formed. When beta-glucose molecules are joined to form a polymer, cellulose is formed.