This study is a first attempt to investigate the impact of urban contamination on metal tolerance of heterotrophic river biofilms using a short-term test based on β-glucosidase activity. Tolerance levels to Cu, Cd, Zn, Ni and Pb were evaluated for biofilms collected at three sites along an urban gradient in the Seine river (France). Metallic pollution increased along the river, but concentratio...

Commonly, the product spectroscopic sequences available on commercial scanners don’t take full advantage of the scanner hardware. At an intermediate, now widely available field of 3T, issues like chemical shift displacement and contamination by external lipids become a problem, especially because of the low γB1 and the slow prescribed gradients. In this context, detection of metabolites at low ...

We describe a microfluidic device for on-chip chemical processing, such as staining, and subsequent washing of cells. The paper introduces "separator walls" to increase the on-chip incubation time and to improve the quality of washing. Cells of interest are concentrated into a treatment stream of chemical reagents at the first separator wall for extended on-chip incubation without causing exces...

Rat liver nuclei were freed of cytoplasmic contamination by washing with Triton-X-100 and subsequent centrifugation through 2.2 M sucrose. Electron microscopic examination showed that the outer membranes of the nuclei had been removed, but that the nuclei otherwise resembled the nuclei of intact liver. Morphological studies, chemical estimations of DNA, RNA, and protein and the estimation of cy...

extreme challenge because of the limited sample amount available combined with possible contamination and chemical modification during sample storage and processing (1, 2). In general, many grams of meteorite material are required and their chemical analysis is laborious, often involving a series of extraction, purification, and identification steps (1, 3). We report here a new method for the d...

Peritonitis is inflammation of the peritoneal cavity. It may be primary (e.g., hematogenous infection of the peritoneum as in feline infectious peritonitis) or secondary (i.e., resulting from chemical or septic contamination of the peritoneal cavity) and may be generalized (i.e., diffuse) or localized (i.e., only a small portion of the abdomen is involved). Chemical peritonitis is caused by the...

Introduction: Olivier salad is one of the most common cold fast foods in our country that is nutritious because of its various ingredients, so it is susceptible to bacterial contamination. This study aimed to evaluate the chemical and microbial quality of Olivier salads that were sold in Mashhad groceries. Methods: In this study, 26 samples from two types of Ol...

Agricultural intensification is associated with the use of great amounts of agrochemicals that may result in the accumulation of metals in soils, and –subsequently—agricultural products and food chain. Nowadays, this is a major concern for many Iranian agricultural products, necessitating scientific researches on the issue. Therefore, the present study has been conducted to evaluate the level o...

Predicting how communities respond to multiple, potentially interacting chemical stressors is inherently difficult because community structure and dynamics, the chemical properties of contaminants, and biological-chemical interactions vary with environmental conditions. Using a field experiment conducted in Antarctica, we tested whether 3 phyla of benthic soft-sediment marine invertebrates—anne...