Articles by Keyword: Lignin Chemistry

Search results for Lignin Chemistry

We found 23 results for you
  1. Wood anatomical and chemical properties related to the pulpability of <em>Eucalyptus globulus</em>: a review

    Wood anatomical and chemical properties related to the pulpability of <em>Eucalyptus globulus</em>: a review

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Eucalyptus globulus is one of the most important hardwood species used by the pulp and paper industry due to its high pulp yield, high wood density, excellent fibre quality and good handsheet properties. However, the wood is a highly variable...
  2. Factors Affecting Soil Phosphate Distribution and Reactions in Cape Forest Soils

    Item type: Journal Article • Journal: South African Forestry Journal
    The amounts of various forms of phosphate in some Cape soils and the adsorption of phosphate by these soils were investigated. The levels were low and only 2% was in available form. The major fraction of phosphate in the soil...
  3. Preparation of Moulding Resins from Inexpensive By-products: Substitution of Phenol Novolac with Unmodified Lignin in Moulding Resin and its Effect on Physical Properties of Mouldings

    Item type: Journal Article • Journal: South African Forestry Journal
    Mouldings of 25% resin content were prepared. Substitution of phenol novolac with various ratios of unmodified bagasse lignin was investigated. The effect of lignin incorporation on tensile and dimensional stability properties of mouldings was then studied. Low levels of lignin...
  4. Laboratory Technique for the Development and Evaluation of Moulded Resinous Composites

    Item type: Journal Article • Journal: South African Forestry Journal
    Two procedures of resin moulding powder preparation were evaluated. Their results are discussed on the basis of their tensile properties for moulded dumb-bells. The best procedure was then implemented for future work on phenolated pitch/ligin systems. Mouldings of different resin...
  5. Preparation of Binders from Inexpensive By-products for Use in High-Pressure Phenolic Laminates: Reactive Phenosolvan Pitch-Lignin Derived Products for Use in Impregnating Varnishes and Testing of 6-Ply Hessian-Paper Laminates

    Item type: Journal Article • Journal: South African Forestry Journal
    Equal mixtures of phenosolvan pitch and autohydrolysis bagasse lignin in the presence of either acid or alkaline catalyst and without catalyst were submitted to a thermal treatment stage at 230°C (Phenolation). Each of the phenolated products was mixed with phenol...
  6. Effect of nutrient calcium on the cell wall composition and digestibility of kikuyu grass (<em>Pennisetum clandestinum</em> Hochst)

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The effect of calcium in the nutrient medium on kikuyu grass (Pennisetum clandestinum Hochst), grown in a solution culture, was investigated. Calcium had no effect on the lignin content of leaf material, but decreased the lignin content per unit stem...
  7. Carbon and nitrogen mineralisation and inactivation of the Cry1Ab protein in Bt maize (MON810) residues during composting

    Carbon and nitrogen mineralisation and inactivation of the Cry1Ab protein in Bt maize (MON810) residues during composting

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    A study was carried out to determine the effects of composting Bt maize residues on carbon (C) and nitrogen (N) contents and activity of the Cry1Ab protein in the compost. Residues (leaf plus stem) of mature Bt maize (DKC 7815B)...
  8. EARLY OBSERVATIONS ON SOME LIMNOLOGICAL CHARACTERISTICS OF THREE ORANGE FREE STATE IMPOUNDMENTS

    EARLY OBSERVATIONS ON SOME LIMNOLOGICAL CHARACTERISTICS OF THREE ORANGE FREE STATE IMPOUNDMENTS

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    The first limnological investigations on three impoundments in the Orange Free State are described. No thermal stratification was found and water temperatures below 8,6°C were not measured. The waters were turbid and the unfavourable underwater light climate was the major...
  9. CHEMICAL PROPERTIES OF WATER-HOLES IN THE KUISEB RIVER CANYON, NAMIB DESERT

    CHEMICAL PROPERTIES OF WATER-HOLES IN THE KUISEB RIVER CANYON, NAMIB DESERT

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Five water-holes in the Kuiseb River Canyon, Namib Desert, were monitored over a three month period during the 1977/78 dry season. Apart from the pronounced dominance of Ca(HCO3)2 in the water taken from a gorra (water-hole excavated by animals), the...
  10. PHYSICAL, CHEMICAL AND BIOTIC RESPONSES TO DECREASING WATER DEPTH IN A HIGHVELD PAN FOLLOWING WET AND DRY SUMMERS

    PHYSICAL, CHEMICAL AND BIOTIC RESPONSES TO DECREASING WATER DEPTH IN A HIGHVELD PAN FOLLOWING WET AND DRY SUMMERS

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    The classification of highveld pans by Geldenhuys (1982) emphasized the spatial diversity of morphology, vegetation and fauna. However, since the characteristics of individual pans also change seasonally and over longer term wet/dry cycles, he called for more detailed limnological studies...