Karen L. Koster

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Protoplasts were isolated from pea (Pisum sativum L. cv. Alaska) embryonic axes during and after germination to determine whether the loss of desiccation tolerance in the embryos also occurs in the protoplasts. At all times studied, protoplast survival decreased as water content decreased; however, the sensitivity to dehydration was less when the(More)
Desiccation tolerance of protoplasts isolated from germinating pea (Pisum sativum L. cv. 'Alaska') embryonic axes depends, in part, on the osmotic strength and composition of the suspending medium. To determine the reason for this dependence and whether treatment with different solutions results in different types of damage, protoplast recovery and survival(More)
Scattering techniques have played a key role in our understanding of the structure and function of phospholipid membranes. These techniques have been applied widely to study how different molecules (e.g., cholesterol) can affect phospholipid membrane structure. However, there has been much less attention paid to the effects of molecules that remain in the(More)
• The literature lacks a clearly established link between class size and student learning. A robust comparison of class size and learning is difficult because a change in class size is often accompanied by a change in a variety of other factors as well. See (Goodman, Koster, & Redinius, 2005) for a good example of a well-designed study that explores this(More)
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