19 20 21 Pimm, S.L. (1982) Food Webs, Chapman &Hall Lawton, J.H. (1989) Ecological Concepts (Cherrett, J.M., ed.), pp. 43-78, Blackwell Pimm, S.L., Lawton, J.H. and Cohen, J.E. (1991) Nature 350,669-674 Martinez, N.D. (1991) Ecol. Monogr. 61,367-392 Paine, R.T. (1988) &o/o9 69,1648-1654 Pimm, S.L. (1984) Nafure 307,321-326 Pimm, S.L. (1991) The Balance ofNature? University of Chicago Press Hall...

particle size, board density and adhesive content are the most important factors, influencing on physical and mechanical properties of particleboard. in this study the effects of density, adhesive content and particle size on withdrawal strength of particleboard made from populus (populus alba) particles have been studied. three levels of density including 0.65, 0.7, and 0.75 g/cm3, three level...

The carbohydrate composition (glucose, xylose, mannose, galactose, and arabinose) of lignocellulosic biomass Liriodendron tulipifera, Populus nigra × maximowiczii, alba glandulosa, euramericana, Salix alba, Quercus variabilis, Robinia pseudoacacia, Zelkova serrata, Abies holophylla, Pinus rigida, rice straw, peanut hull was investigated based on high-performance liquid chromatography (HPLC) gas...

Recent advances in population genomics have triggered great interest in the genomic landscape of divergence in taxa with 'porous' species boundaries. One important obstable of previous studies of this topic was the low genomic coverage achieved. This issue can now be overcome by the use of 'next generation' or short-read DNA-sequencing approaches capable of assaying many thousands of single nuc...

Seed germination is considered a critical phase in plant development and relatively sensitive to heavy metals. White poplar (Populus alba) trees tend to accumulate Cd and Zn in their tissues. We tested if soil contamination can affect P. alba progeny, reduced seed germination and explored the distribution of mineral elements in the seed. For this purpose, fruits and seeds from female P. alba tr...