ABSTRACT
NASA has developed a compact laser light-scattering instrument that employs both static and dynamic light-scattering techniques for microgravity research. The first use of this instrument was to study the behavior of colloidal hard spheres in a reduced gravity environment during the Second United States Microgravity Laboratory space shuttle mission. We discuss the instrument design and possible improvements based on our observations of significant differences between hard-sphere behavior in Earth's gravity and microgravity.
Subject(s)
Actinomycetales/metabolism , Acetates/metabolism , Anti-Bacterial Agents/biosynthesis , Chemical Phenomena , Chemistry , Chloramphenicol/biosynthesis , Erythromycin/biosynthesis , Glucose/metabolism , Glycosides/biosynthesis , Novobiocin/biosynthesis , Nucleosides/biosynthesis , Shikimic Acid/biosynthesis , Steroids/biosynthesis , Streptomycin/biosynthesis , Terpenes/biosynthesis , Tetracycline/biosynthesisSubject(s)
Anhydrides , Chemical Phenomena , Chemistry , Isomerism , Magnetic Resonance Spectroscopy , Mitosporic Fungi , Oxidation-Reduction , SuccinatesSubject(s)
Antifungal Agents/isolation & purification , Bridged-Ring Compounds/isolation & purification , Furans/isolation & purification , Aspergillus/metabolism , Infrared Rays , Ketones/isolation & purification , Magnetic Resonance Spectroscopy , Optical Rotation , Penicillium/metabolism , Spectrum AnalysisSubject(s)
Caproates , Chemical Phenomena , Chemistry , Iodides , Magnetic Resonance Spectroscopy , Spectrum AnalysisSubject(s)
Antineoplastic Agents/therapeutic use , Caproates/therapeutic use , Mitosis/drug effects , Neoplasms, Experimental/drug therapy , Animals , Carcinoma 256, Walker/drug therapy , Lung Neoplasms/drug therapy , Mice , Neoplasm Transplantation , Rats , Sarcoma 180/drug therapy , Sarcoma, Yoshida/drug therapyABSTRACT
Experiments have been done to confirm the previously reported effect of indoleacetic acid (IAA) on the rate of CO(2) assimilation in bean leaves. It was shown that spraying the leaves of a variety of plants caused an increase in the rate of CO(2) assimilation from 30% to 100% during the half-hour to 1 hour period following spraying. The only plant tested which did not show such an effect was corn.The breaking of dormancy of axial buds in the bean plant was correlated with an increase in the rate of CO(2) assimilation in adjacent leaves for a brief period of time. It has been shown that IAA solution sprayed on 1 leaflet of a leaf can cause an increase in the rate of CO(2) assimilation in the other leaflets, and that IAA applied to the cut stem of a leaflet or a developing bud can be transported to adjacent leaves and cause an increase in the CO(2) assimilation rate. The reaction caused by IAA is very similar to that caused by the breaking of dormancy of a bud. This indicates that the bud break response in CO(2) assimilation in leaves is caused by auxin synthesized in a bud as it begins to grow, and exported into adjacent leaves.
