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  1. Changes in ultraviolet-B and visible optical properties and absorbing pigment concentrations in pecan leaves during a growing season

    UV-B (280-320 nm) and visible (400-760 nm) spectral reflectance, transmittance, and absorptance; chlorophyll content; UV-B absorbing compound concentration; and leaf thickness were measured for pecan (Carya illinoensis) leaves over a growing season (April-October). Leaf samples were collected monthly from a pecan plantation located on the Southern...

    Author(s):
    Yadong Qi; Shuju Bai; Gordon M. Heisler
    Year:
    2003
    Keywords:
    UV-B/visible radiation, Spectral absorptance/reflectance/transmittance, UV-B absorbing compound concentration, Chlorophyll, Leaf thickness, Pecan (Carya illinoensis)
    Source:
    Agricultural and Forest Meteorology 120:229-240

  2. Ultraviolet radiation, human health, and the urban forest

    Excess exposure to ultraviolet (UV) radiation from the sun, particularly the ultraviolet B (UVB) portion, has been linked with adverse effects on human health ranging from skin cancers to eye diseases such as cataracts. Trees may prevent even greater disease rates in humans by reducing UV exposure. Tree shade greatly reduces UV irradiance when both the sun and sky are...

    Author(s):
    Gordon M. Heisler; Richard H. Grant
    Year:
    2000
    Keywords:
    ultraviolet radiation, urban environments, radiation measurements, skin cancer, tree shade
    Source:
    Gen. Tech. Rep. NE-268. Newtown Square, PA: U. S. Department of Agriculture, Forest Service, Northeastern Research Station. 35 p.

  3. Tailoring the yield and characteristics of wood cellulose nanocrystals (CNC) using concentrated acid hydrolysis

    Cellulose nanocrystals (CNC) have recently received much attention in the global scientific community for their unique mechanical and optical properties. Here, we conducted the first detailed exploration of the basic properties of CNC, such as morphology, crystallinity, degree of sulfation and yield, as a function of production condition variables. The rapid cellulose...

    Author(s):
    Liheng Chen; Qianqian Wang; Kolby Hirth; Carlos Baez; Umesh P. Agarwal; J. Y. Zhu
    Year:
    2015
    Keywords:
    Cellulose nanocrystals (CNC), Crystallinity, Crystal length and morphology, Surface charge, CNC yield optimization, Concentrated acid hydrolysis, Cellulose nanocrystals (CNC), Crystallinity, Crystal length and morphology, Surface charge, CNC yield optimization, Concentrated acid hydrolysis
    Source:
    Cellulose

  4. Toward sustainable and complete wood valorization by fractionating lignin with low condensation using an acid hydrotrope at low temperatures (≤80 °C)

    Poplar wood was fractionated under a range of conditions using an inexpensive and recyclable commercial aromatic acid, p-toluenesulfonic acid (p-TsOH), as an acid hydrotrope (AH). The fractionated cellulose-rich solid fraction demonstrated excellent physical and optical properties as papermaking fibers. The dissolved xylose can be dehydrated into furfural using the p-...

    Author(s):
    Jinlan Cheng; Kolby Hirth; Qianli Ma; Junjun Zhu; Zhaojiang Wang; J. Y. Zhu
    Year:
    2019
    Keywords:
    Lignocellulose fractionation, lignin depolymerization and condensation, acid hydrotrope, nuclear magnetic resonance (NMR), catalysis
    Source:
    Industrial & Engineering Chemistry Research. 58(17): 7063-7073.
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