The chemical experiment is designed for undergraduates majoring in chemistry, energy, and environment. The intended purpose is that the students will comprehend the reaction mechanism of photocatalytic reduction of CO[subscript 2] through hands-on experiments and deepen their understanding of sustainable energy technologies. More importantly, the…

Chemical responses as active and precisely targeted as those of animal immune systems characterize the defenses plants mount against microbial/herbivoral predation and disease. Past and current research in this field is reported and discussed. Applications, such as the prediction of past outbreaks, are also discussed. (JN)

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…

Summarizes research done on the resting and action potential of nerve impulses, electrical excitation of nerve cells, electrical properties of Nitella, and temperature effects on action potential. (GS)

A database had been developed for the Phoenix Desert Botanical Garden's Living Plant Collection using Statistical Analysis System software. Implementation procedures, data dictionary maintenance, data entry, updating, and reporting are described. (JN)

Describes experiments demonstrating that root pressure in plants is probably controlled by a circadian rhythm (biological clock). Root pressure phenomenon plays significant part in water transport in contradiction with prevalent belief. (PS)

Organized field trips in the tropics proved to be an effective way to gather new information about ferns. The areas of study covered were: systematics and ecology, cytology and gametophyte structure, and morphogenesis and physiology. (PS)

Discusses recent advances in culturing somatic cells of plants that now make it possible to apply the powerful techniques of microbial genetics to higher life forms. (Author/JR)

Updates knowledge on nitrogen fixation, indicating that investigation of free-living nitrogen-fixing organisms is proving useful in understanding bacterial partners and is expected to lead to development of more effective symbioses. Specific areas considered include biochemistry/genetics, synthesis control, proteins and enzymes, symbiotic systems,…

The use of green, red, and far-red light-emitting diodes (LEDs) as light sources for plant physiological studies is outlined and evaluated. Indicates that LED lamps have the advantage over conventional light sources in that they are lightweight, low-cost, portable, easily constructed, and do not require color filters. (Author/DH)

Highlights major activities, conferences, conference and published papers, monographs, and research studies in paleobotany during 1982. Indicates that paleobotanists made more frequent use of the perspectives and ideas of disciplines as developmental biology and sedimentology in their research endeavors. (Author/JN)

Describes the experimental procedure and expected outcome in the growth of rice seedlings with light conditions and water aeration as variables. (GS)

Discusses graviperception and gravitropism by plant roots. Indicates that graviperception occurs via sedimentation of amyloplasts in columella cells of the root cap and that the minimal graviresponsiveness of lateral roots may be due to the intensity of their caps to establish a concentration gradient of inhibitor(s) sufficient to affect…

Scientific research leading to the discovery of female plants of the red alga Palmaria plamata (dulse) is described. This discovery has not only advanced knowledge of marine organisms and taxonomic relationships but also has practical implications. The complete life cycle of this organism is included. (JN)

Describes the diversity of plants. Outlines novel developmental and complex genetic processes that are specific to plants. Identifies approaches that can be used to solve problems in plant biology. Cites the advantages of using higher plants for experimental systems. (RT)