Maynard J Pro

Bio: Maynard J Pro is an academic researcher from Internal Revenue Service. The author has contributed to research in topics: Neutron activation analysis & Lithium. The author has an hindex of 4, co-authored 15 publications receiving 77 citations.

Effect of Crop Level on Growth, Yield and Wine Quality of a High Yielding Carignane Vineyard

Abstract: Three crop levels were induced by cluster thinning in a high yielding Carignane vineyard. Reduction of cluster number from about 60 to 40 per vine did not result in reduction of yield, since berry size and number per cluster were increased. Pruning weight of the thinned treatment was increased and so was the capacity of the vines. Further thinning to 20 clusters per vine reduced the yields since the increase in berry size and number was not sufficient to compensate for the reduced number of clusters. The yield to pruning weight ratio was found to be a good measure for crop load. Crop load reduction from 19.6 to 12.0 kg fruit per kg prunings increased wine quality and a further reduction to 8 did not. It was concluded that crop loads above 12 have conspicious effects of overcropping, i.e. , reduced wine quality, color quality and intensity and total ash, delayed maturation, reduced rate of sugar accumulation, must acid concentration at comparable sugar content, proline and amino acids content, bud fertility, and pruning weight. In high yielding cultivars, the crop load ratio has a more relevant effect on wine quality than the crop level as such.

Regioselective Homo- and Codimerization of 1-Alkynes Leading to 2,4-Disubstituted 1-Buten-3-ynes by Catalysis of a (η5-C5Me5)2TiCl2/RMgX System

Abstract: A series of 1-alkynes (RC≡CH where R=Et, n-Pr, n-Bu, n-C6H13, cyclohexyl, Ph, Me3Si, Me3SiCH2, and Me3SiOCH2) was found to dimerize regioselectively (>99%) to 2,4-disubstituted 1-buten-3-ynes in 92–99% yields by catalysis of (η5-C5Me5)2TiCl2/i-PrMgBr at 30 °C in 1–3 h. The catalyst system is also effective for the regioselective codimerization of various 1-alkynes with 1-ethynylcyclohexene or ethynylbenzene.

Evaluation of desorption/ionization mass spectrometric methods in the forensic applications of the analysis of inks on paper.

Abstract: Fast atom bombardment and laser desorption mass spectrometry (LDMS) provide molecular level information concerning an ink's composition. Two ink-jet printer inks, Ink A containing the cationic dye Methyl Violet 2B, and Ink B containing the anionic dye, Solvent Black, were studied. Both positive and negative ion detection modes of the mass spectrometer were used. LD may be used for the analysis of inks on paper. Once on paper, the ink's solvent system has evaporated, leaving mainly the dyes behind, which are detected using LDMS. An ink fades with time, indicating that the dyes are degrading. Preliminary results from an accelerated aging study of ballpoint pen ink using UV irradiation confirm that dye degradation products are formed. The degradation chemistry follows an oxidative demethylation process for which all products formed are detected using LDMS. Results suggest that LDMS may be developed to determine the relative age of inks.