4 Ergebnisse.

Besides live biomass and decaying dead biological matter, humus constitutes an important component of organic matter in the soil. Humic substances are heterogeneous polymers formed during the process of decay and degradation of plant, animal, and microbial biomass. The humic fraction of organic matter is a stable nutrient base that serves as a slow-release source of carbon and energy for indigenous, slow-growing microorganisms in the soil. Thi...

Present in soil and water, humic substances are the most widespread organic compounds, naturally occurring from a physical, chemical, and microbiological transformation of biomolecules. They represent about 25% of the total organic carbon on the Earth and comprise up to 75% of the dissolved organic carbon in water, making them important for multiple environmental processes in both soil and aquatic systems. Despite many decades of extensive stu...

It took a long time for humans to recognize the existence of a direct link between environmental pollution and health deterioration. In the 1990s, scientists demonstrated the existence of this link through epidemiological studies and new technical materials that can measure accumulation effects of small toxic quantities. Consequently, concerns about human health were accentuated, and the notion of environmental health has emerged. This book co...

Ce livre traite les éléments principaux des peintures et plus particulièrement des peintures pigmentées et des fonctions qu'ils remplissent. Si l'on tient compte du grand nombre d'ingrédients qui peuvent servir pour les cinq composants, il semble que les peintures soient complexes. Les propriétés du feuil final varient fortement en fonction de la formule du mélange. Une autre complication découle du fait que ces matériaux doivent agir comme de...