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Humic substances are an important biogeochemical ecological factor that can initiate chemical stress in exposed organisms. The effects of stress by humic substances on Darwinian fitness are the subject of this thesis. Lifespan and fertility of the cosmopolitan water flea Moina macrocopa were examined under exposure of humic substances at environmentally realistic concentrations. More
The effects of diets containing different levels of humic acid (HA) were determined on several blood and milk parameters in dairy goats. Eighteen Saanen goats (2 years old, 52 kg body weight) were fed three diets containing: 0 g HA/kg body weight (T1 ), 1 g HA/kg – (T2 ) or 3 g HA/kg – (T3 ) in a 3x3 latin square experimental design. Each period consisted of 21 days preliminary period and 7 days collection phase. More
Humic substances (HS) are ubiquitous natural products of decomposition of dead organic matter. HS is present in most freshwaters at concentrations ranging from 0.5 to 50 mg L1 . Organic carbon can represent 20% dry weight of sediments. Recently, the interaction of dissolved HS with the aryl hydrocarbon receptor (AhR) has been demonstrated. More
Humic acids (НА), а class of compounds resulting from decomposition of organic matter, particularly plants аге natural constituents of drinking water, soil and lignite. lt inhibit bacterial and fungal growth, thus decrease levels of mycotoxins in feed. More
Peat is an easily available natural material and a source of biologically active substances widely used, not only in agriculture but in human and animal medicine as well. In recent years, interest in the use of peat as a feed supplement has increased, particularly due to its capability to prevent enteric diseases and to stimulate growth in piglets and pigs. More
Studies on vital brown geopolymers by Christian E.W. Steinberg, R. Menzel
Humic acids are a class of compounds resulting from decomposition of organic matter, particularly plants, and are natural components of drinking water, soil and lignite. They are three dimensional macrocolloidal molecules with a polyaromatic center containing iso- and heterocyclic structures and peripheral side-chains. More
This study was designed to investigate the effect of addition humic acid to the developed laying hen diets on egg production, egg quality and some physiological traits. More