Margaret A. Franzen

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Evaluations of the success of different conservation strategies are still in their infancy. We used four different measures of project outcomes--ecological, economic, attitudinal, and behavioral--to test hypotheses derived from the assumptions that underlie contemporary conservation solutions. Our hypotheses concerned the effects of natural resource(More)
Cocoa is a crop grown largely by smallholder farmers in the lowland tropics, including parts of Latin America, West Africa, and Indonesia. Research suggests that it has the potential to provide biodiversity benefits when grown under certain shade conditions, especially when compared with alternative land uses. The primary literature on cocoa production(More)
The technology now exists to construct physical models of proteins based on atomic coordinates of solved structures. We review here our recent experiences in using physical models to teach concepts of protein structure and function at both the high school and the undergraduate levels. At the high school level, physical models are used in a professional(More)
The first generalized transducing bacteriophage reported for Bacillus megaterium has been characterized. Optimum conditions for lysate production and transduction procedures were established so that transducing frequencies of 8 x 10(-6) and higher are now possible. The phage, MP13, has a head diameter of 97 nm and a contractile tail (202 by 17 nm) and(More)
Ornithine decarboxylase isolated from HTC cells was separated into two distinct charged states by salt-gradient elution from DEAE-Sepharose columns. This charge difference between the enzyme forms was maintained in partially purified preparations, but enzyme form II was observed to change to form I in a time-dependent polyamine-stimulated fashion in crude(More)
A team of students, educators, and researchers has developed new materials to teach cell signaling within its cellular context. Two nontraditional modalities are employed: physical models, to explore the atomic details of several of the proteins in the angiogenesis signaling cascade, and illustrations of the proteins in their cellular environment, to give(More)
CONDITIONS II. S. R. Moore, M. Franzen, P. H. Benoit, D. W. G. Sears, A. Holley, M. Myers, R. Godsey, and J. Czlapinski. Arkansas-Oklahoma Center for Space and Planetary Sciences and Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, USA. Arkansas-Oklahoma Center for Space and Planetary Sciences and Department of(More)
“O h,...you mean if you want to change the amino acid from an arginine to an alanine, you just change the code in that position.” This “aha moment” recently happened for a member of the Brown Deer High School SMART (Students Modeling a Research Topic) Team at a Saturday morning meeting while awaiting the arrival of their scientist mentor. This student had(More)
Several notable features were found on the surface the asteroid, probably the most interesting being the ponded craters that were discovered in the equatorial regions. These ponded craters appear to be impact craters that were subsequently partially filled with fine grained regolith. The ponded regolith is much younger than the crater itself, implying an(More)
Genes involved in the biosynthesis of leucine have been mapped in Bacillus megaterium QM B1551, using transducing phage MP13. Mutations were designated leuA, leuB, or leuC on the basis of enzyme assays. Two mutant strains were deficient in the enzyme activities of leuA (alpha-isopropylmalate synthase) and leuC (beta-isopropylmalate dehydrogenase) and so may(More)