منابع مشابه
The Patterns of Pulpwood Trade within the US South
The Southern timber market is the major source of both softwood and hardwood pulpwood in the US. In 1997, three-fourths of total US pulpwood production was produced in the region. The locations of pulpmills and fiber sources determine the patterns of pulpwood trade between the states. Prediction of trade is important for understanding subregional pulpwood markets in the US South and for timber ...
متن کاملThe effect of Sirex noctilio infestation and fire damage on the chemical composition of South African-grown Pinus patula pulpwood
The South African pulp industry is reliant on Pinus patula as a main constituent of the softwood raw material. However, trees in plantations can periodically be physiologically stressed due to a variety of biotic and abiotic factors. Damaged or dead trees can constitute a loss of pulpwood production to the mill, with the economic consequence of having to source the timber elsewhere on the open ...
متن کاملPulpwood Production, Prices, and Markets in North Carolina by
In this paper, we first analyze trends in pulpwood production (1980-1997) and prices (1977-1998) in North Carolina. We then attempt to investigate spatial integration of the delivered and stumpage pulpwood markets for both mixed hardwood and pine in two regions of North Carolina (western; central and east combined). Results indicate that North Carolina's total roundwood removal volumes have gro...
متن کاملSOLVING TREE SQUIRREL DEBARKING PROBLEMS IN TAIWANâ•flA REVIEW
Extensive forest conversion of the low-valued natural hardwood forest into coniferous plantations is the possible cause of the critical problem of squirrel debarking. The tree squirrel that causes the major damage is the red-bellied tree squirrel (Callosciurus erythraeus). Conifers are more susceptible to the damage than are hardwood species, especially the exotics. Intermediate-aged plantation...
متن کاملextraction and acetylation of purified trypsin from bovin pancreas and study of some its physico-chemical properties
آنزیم تریپسین در شرایط قلیایی ناپایدار می باشد .و فعالیت پروتئولیتیکی تریپسین منجربه خود هضمی آن در جایگاههای خاصی می گردد. بنابر این آنزیمی با ناپایداری بالا محسوب میگردد. در سالهای اخیر موفق شدند که با ایجاد تغیرات شیمیایی با اضافه کردن فلزات خاص ، کلسیم و یا عمل استیلاسیون منجر به افزایش پایداری آنزیم تریپسین گردند. مطالعات در حال حاضر نشان می دهد که تریپسین استیله شده فعالیت آنزیمی خود را ...
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ژورنال
عنوان ژورنال: JAPAN TAPPI JOURNAL
سال: 1958
ISSN: 0022-815X,1881-1000
DOI: 10.2524/jtappij.12.719