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Articles by R. Neil Reese
Total Records ( 2 ) for R. Neil Reese
  Kim Piechowski , Duane P. Mathees , R. Neil Reese and Rita S.K. Majerle
  Multiple regression models of the HPLC chromatogram peak areas and the results from lettuce seed bioassays were used to determine which combination of isobutylamides from E. angustifolia root extracts accounted for the allelopathic effects in the bioassay. Two fractions initially identified as peaks 3 and 6 and subsequently determined to be undeca-2E-ene-8, 10-diynoic acid isobutylamide and dodeca-2E, 4E, 8Z, 10E-tetraenoic acid isobutylamide, respectively, were identified as the compounds responsible for the allelopathic activity. The two compounds each accounted for slightly more than 6% of the total bioassay variability, but together accounted for about 73% of the variability based on the simplest non-linear model. Direct application of the purified compounds in the bioassay demonstrated that use of the genetic variability in the Echinacea samples allowed identification of synergistic effects without the traditional approach of fractionation and testing of all compounds and their possible combinations.
  C. Dean Dybing and R. Neil Reese
  In this study, flowers varying in level of pod set were obtained from the semi-determinate, many-flowered line IX93-100 and analyzed for total soluble sugars, transported N compounds, starch and total N. Correlations between percent pod set and chemical composition varied with method of sampling for some substances. Little evidence of nutrient shortage in aborting flowers was seen. Analysis of raceme tissues separately from flowers revealed little evidence of restricted nutrient removal from raceme into the aborting flower except possibly for the transported N compounds. The best association with abortion appeared to be slow growth of the flower.
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