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Niels Maness

Education
PhD:   Agronomy, Oklahoma State University, Stillwater, OK '87
MS:     Agronomy, Texas A&M University, College Station, TX '83
BS:     Agronomy, Texas A&M University, College Station, TX '80

Teaching Activities

  • HORT 5433, Postharvest Physiology taught in the fall, even years (2010).
  • HORT 5443, Basic Laboratory Experimentation taught in the fall, odd years (2011).
  • Advisement activities include undergraduate advisement and M.S. and Ph.D. chair and committee member.

Research Activities
Activities involve natural products and nutraceuticals; mechanisms involved in shelf life extension of horticultural products; processing technologies for adding value to horticultural commodities; new crops and crop improvement. Current projects involving nutraceuticals include capsaicinoids in peppers, lycopene from watermelon, thujone/camphor from sage and thymol/carvacrol from oregano. Shelf life extension projects include defining the mechanism of opalescence in pecans and evaluating technologies to prevent it. Processing technologies under development include filtration processing for lycopene segregation from watermelon and collaboration on a project to develop x-ray as a non-destructive means for pecan grading and sorting. New crops under investigation include sage and oregano, both targeted for nutraceutical processing. Associated cropping systems for these crops, and for mechanized watermelon harvest for lycopene production, are also under development. Crop improvement activities involve selection for specific nutraceutical production potential for peppers, sage and oregano. Development of integrated production, harvesting, postharvest handling and processing systems for horticultural crops is a focus of research activities.

 Major Areas of Interest

  • Natural Products in Foods
  • Supercritical Carbon Dioxide/Liquefied Gas Extraction Technologies
  • New Crop and Cropping Systems Introduction
  • Shelf Life Enhancement Technologies
  • Softening Mechanisms in Ripening Fruit

Selected Publications (52 total):

Lilis Suryawati, Mark R. Wilkins, Danielle D. Bellmer, Raymond L. Huhnke, Niels O. Maness and Ibrahim M. Banat. 2009. Effect of hydrothermolysis process conditions on pretreated switchgrass composition and ethanol yield by SSF with Kluyveromyces marxianus IMB4. Process Biochemistry 44: 540-545.

Choudhary, R., T. Bowser, P. Weckler, N. Maness and W. McGlynn. 2009. Rapid estimation of lycopene concentration in watermelon and tomato puree by fiber optic visible reflectance spectroscopy. Postharvest Biology and Technology 52: 103-109.

Suryawati, L., M.R. Wilkins, D.D. Bellmer, R.L. Huhnke, N.O. Maness and I.M. Banat. 2008. Simultaneous saccharification and fermentation of Kanlow switchgrass pretreated by hydrothermolysis using Kluyveromyces marxianus IMB4. Biotechnology and Bioengineering 101:894-902.

Kotwaliwale, N., P.R. Weckler, G.H. Brusewitz, G.A. Kranzler and N.O. Maness. 2007. Non-destructive quality determination of pecans using soft X-rays. Postharvest Biology and Technology 45:372-380.

Rohla, C., M.W. Smith and N.O. Maness. 2007. Influence of cluster thinning on return bloom, nut quality, and concentrations of potassium, nitrogen, and non-structural carbohydrates. J. Amer. Soc. Hort. Sci. 132:158-165.

Smith, M.W., C.T. Rohla and N.O. Maness. 2007. Correlations of crop load and return bloom with root and shoot concentrations of potassium, nitrogen, and nonstructural carbohydrates in pecan. J. Amer. Soc. Hort. Sci. 132:44-51.

Wilkins, M.R., L. Suryawati, N.O. Maness and D. Chrz. 2007. Ethanol Production by Saccharomyces cerevisiae and Kluyveromyces marxianus in the Presence of Orange Peel Oil. World J. Micro. Biotech. 23: 1161-1168.

Rohla, C., M.W. Smith, N.O. Maness and W. Reid. 2007. A Comparison of return bloom and nonstructural carbohydrates, nitrogen, and potassium concentrations in moderate and severe alternate-bearing pecan cultivars. J. Amer. Soc. Hort. Sci. 132: 172-177.

Jones, C.L., N. O. Maness, M. L. Stone and R. Jayasekara. 2007. Chlorophyll Estimation Using Multi-spectral Reflectance and Height Sensing. Trans. Amer. Soc. Agr. Engr. 50:1867-1872

Stiegler, J.C., G. Bell and N. Maness. 2005. Spectral detection of pigment concentrations in creeping bentgrass golf greens. Int. Turfgrass Soc. J. 10:818-825.

Rohla, C.T., M.W. Smith and N.O. Maness. 2005. Effects of cluster size and shoot type on characteristics of pecan nuts. HortScience 40:1300-1303.

Stiegler, J.C., G. Bell and N. Maness. 2004. Comparison of acetone and N, N dimethylformamide for pigment extraction in turf grass. Comm. Soil Sci. Plant Anal. 35: 1801-1813.

Leskovar, D.I., H. Bang, K. Crosby, N. Maness, J.A. Franco and P. Perkins-Veazie. 2003. Lycopene, carbohydrates, ascorbic acid and yield components of diploid and triploid watermelon cultivars are affected by limited irrigation. J. Hort. Sci. Biotech. 79:75-81.

Book Chapters

  • Maness, N.O. 2009. Extraction and Analysis of Soluble Carbohydrates . In Ramanjulu Sunkar (ed.) Plant Stress Tolerance, Methods in Molecular Biology, Humana Press, submitted.
  • Maness, N.O. 2005. Filbert: Postharvest Qaulity Maintenance Guidelines. In K. Gross, M. Saltveit and C.Y. Wang (eds.) The Commecial Storage of Fruits, Vegetables, and Florist and Nursery Stocks, 4th Edition, USDA, ARS Agriculture Handbook No. 66.
  • Maness, N.O. 2005. Peanut: Postharvest Qaulity Maintenance Guidelines. In K. Gross, M. Saltveit and C.Y. Wang (eds.) The Commecial Storage of Fruits, Vegetables, and Florist and Nursery Stocks, 4th Edition, USDA, ARS Agriculture Handbook No. 66.
  • Maness, N.O. 2005. Pecan: Postharvest Quality Maintenance Guidelines. In K. Gross, M. Saltveit and C.Y. Wang (eds.) The Commecial Storage of Fruits, Vegetables, and Florist and Nursery Stocks, 4th Edition, USDA, ARS Agriculture Handbook No. 66.
  • Maness, N.O. and P. Perkins Veazie. 2003. Chapter 15. Soluble and Storage Carbohydrates. In J.A. Bartz and J.K. Brecht (eds.) Postharvest Physiology and Pathology of Vegetables, 2nd Edition, Marcel Dekker, New York, pp. 361-382.
  • A.C. Smith, K.W. Waldron, N.O. Maness, and P. Perkins Veazie. 2003. Chapter 12. Vegetable Texture: Measurement and Structural Implications. In J.A. Bartz and J.K. Brecht (eds.) Postharvest Physiology and Pathology of Vegetables, 2nd Edition, Marcel Dekker, New York, pp. 297-330.
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