Describes how and why plant habitats naturally change. Focuses on changing flora of New York's Pine Bush dune flats and the McLean Bog. (NEC)

Related history and laboratory work which lead to isolation of oligosaccharins, a new class of regulatory molecules found in plant cell walls. These substances function in growth, development, reproduction, and defense. Mixtures of oligosaccharins and other hormones can stimulate growth of an undifferentiated callus, roots, vegetative…

Describes methods for isolating, purifying, and analyzing plant hormones (molecules involved in plant growth regulation and development). The presentation reflects the historical development of analyses, beginning with bioassays and ending with novel immunochemical assays. (JN)

Provides information for teaching a unit on wild plants, including resources to use, plants to learn, safety considerations, list of plants (with scientific name, edible parts, and uses), list of plants that might cause allergic reactions when eaten. Also describes the chickweed, bull thistle, and common mallow. (BC)

Describes an inexpensive and convenient way to solve the problem of maintaining the proper humidity needed in incubation chambers. (JN)

Described is a method of maintaining satisfactory levels of humidity in mobile green houses and environmental chambers, without the use of expensive humidifiers. (Author/EB)

An analysis of five commercial service centers and various data bases is presented. A current awareness profile covering both chemical and botanical fields was sent to each service center. The responses were evaluated on the basis of promptness, interaction with the user, and physical format of the listing, among other things. (Author/NH)

Reports comparison of three models of apparatus designed to collect gas evolved by a photosynthesizing water plant. Problems of design and operation are reported for each model. (AL)

Points out common misconceptions, especially the idea that pollination in flowering plants corresponds to fertilization in animals. Gives history of understanding of plant sexuality, then summarizes modern view. Suggests we teach accurately or not at all. (EB)

Describes a multiple-image sound-and-light show used as a motivating experience for non-science majors in an introductory botany course. (AL)