Production of wood pellets is a relatively new and expanding industry in which the exposure profiles differ from those in other wood-processing industries like carpentries and sawmills where there are lower levels of wood dust. Sixty-eight personal exposure measurements of wood dust (inhalable and total dust) and resin acids were collected for 44 participants at four production plants located i...

A microcomputer based video image analyzer is described and demonstrated in the analysis and comparison of tissue types of 6-month-old Ethrel-treated and control seedlings of loblolly pine (Pinus taeda L.). Two different programs were employed. ;Topographer I' sought, identified, and measured cell or resin canal lumen areas, and ;Area' measured tracheid length and silhouette areas. Ethrel treat...

Elevated levels of monoterpenes and diterpene resin acids are produced in the stems of lodgepole pine (Pinus contorta var latifolia) saplings when wounded and inoculated with the blue-stain fungus Ceratocystis clavigera or when wounded and treated with a pectic fragment from tomato leaves (PIIF) or a fungal cell wall fragment (chitosan). This induced defensive response (hyperoleoresinosis) is t...

B in 1956, American artist Fred Tomaselli grew up in Orange, California, and in 1982, he graduated from California State University, Fullerton, with a degree in painting and drawing. In the early 1980s, Tomaselli became established in the “Downtown L.A.” art, music, and drug countercultures. Since 1985, he has lived and worked in Brooklyn, New York. He is best known for his visually stunning hy...

Genetic analyses indicate that Pinus densata is a natural homoploid hybrid originating from Pinus tabuliformis and Pinus yunnanensis. Needle morphological and anatomical features show relative species stability and can be used to identify coniferous species. Comparative analyses of these needle characteristics and phenotypic differences between the artificial hybrids, P. densata, and parental s...

Adhesives products and demand for them in China are discussed in this paper with special emphasis on wood adhesives products in this decade. In 1994, the wood industries in China consumed more than 330,000 tons of adhesives. The estimated demand for wood adhesives will be more than 560,000 tons in the year 2000. The main wood adhesive used is urea-formaldehyde resin. Its consumption in 1994. wa...

Abstract. Amber is chiefly known as a preservational medium of biological inclusions, but it itself chemofossil, comprised fossilised plant resin. The chemistry today's resins has been long investigated means understanding the botanical sources ambers. However, little about chemical variability and consequently that ambers are derived from particular resins. We undertook experimental resin prod...

The marijuana plant Cannabis sativa contains a bewildering Introduction array of organic chemicals. As is true with other botanic species, there are representatives of almost all chemical classes present, including monoand sesquiterpenes, carbohydrates, aromatics, and a variety of nitrogenous compounds. Interest in the study of this plant has centered primarily on the resinous fraction, as it i...