Samples of rumen digesta were collected from 2 cows fed with a 100:0 or 40:60 forage/concentrate diet 1 h before and 2 h after feeding. Enzymes from particle-associated microorganisms were extracted by 5 different methods, including physical (freezing, grinding and sonication) or chemical and enzymatic (autolysis in a buffer, lysozyme and CCl4) treatments. Hydrolytic enzyme activities were meas...

The question posed in this article is how useful the chemical concentration measurements for predicting the outcome of sediment toxicity tests are. Using matched data on sediment toxicity and sediment chemical concentrations from a number of studies, we investigated several approaches for predicting toxicity based on multiple logistic regression with concentration-addition models. Three models ...

Human milk is a repository for certain classes of long-lived, fat-soluble environmental contaminant chemicals. Some members of this class, such as the chlorinated pesticides and the chlorinated biphenyls, can be expected to be present at chemical waste disposal sites. Analysis of samples of breast milk obtained from women near such a site could provide documentation that exposure has taken plac...

The question posed in this paper is: How useful are chemical concentration measurements for predicting the outcome of sediment toxicity tests? Using matched data on sediment toxicity and sediment chemical concentrations from a number of studies, we investigated several approaches for predicting toxicity based on multiple logistic regression with concentration-addition models. Three models were ...

The separation of graphene grown on metallic catalyst by chemical vapor deposition (CVD) is essential for device applications. The transfer techniques of graphene from metallic catalyst to target substrate usually use the chemical etching method to dissolve the metallic catalyst. However, this causes not only high material cost but also environmental contamination in large-scale fabrication. We...

As majority of people around the world rely on non-conventional medicine mainly of herbalsources for their primary healthcare nowadays, the quality of herbal medicine is one of themost important issues. The products may be contaminated with chemical toxins, excessivepesticides and heavy metals during the growth process with contaminated environment or duringharvesting, storing conditions and tr...