Strips of longitudinal myometrium from cows were obtained on days 19-21 and 1-5 of the estrous cycle and incubated (aerated atmosphere; 4 degrees C; 24, 48 or 72 h) with a mixture of PCBs Aroclor (Ar) 1248 or with one of three PCBs (77, 126 or 153), all at doses of 10 or 100 ng/ml. The force and frequency of spontaneous and oxytocin (OT; 10(-7)M)-stimulated contractions of each strip was regist...

the prospects of using the biostimulation and bioaugmentation treatment for the removal of the polychlorinated biphenyl (pcbs) from contaminated sediment collected from the sewage canal in the surroundings of a former pcb manufacturing plant in slovakia is described. the eleven bacterial strains isolated in our previous work from sewage strážsky canal sediments were able to aerobically degrade ...

A series of field studies was conducted to determine the bioaccumulation of polychlorinated biphenyl (PCB) congeners in the terrestrial food web of the Kalamazoo River flood plain. Samples included colocated soils, native plants likely to be consumed by wildlife, several taxa of terrestrial invertebrates, small mammals, passerine bird eggs, nestlings, and adults, and great horned owl plasma and...

OBJECTIVE Insulin-like growth factor I (IGF-I) and dioxin-like polychlorobiphenyls (DL-PCBs) have been associated with the pathogenesis of several diseases like cancer, diabetes and growth disorders. Because it has been suggested that organohalogenated contaminants could influence IGF-I levels in adults, the potential relationship between DL-PCBs and IGF-I serum levels was studied in 456 health...

Abstract Isomer shifting of polychlorinated biphenyls(PCBs) by heat treatment was inv estigated. A mixture of Japanese commercial PCBs; Kanechlor-400 or Kanechlor -600, was places in the ampoules and the solvent was evaporated. After being sealed, the ampoules were heated. Temperature, heating time and atmosphere w ere experimental parameters. And addition of copper powder as a catalyst and H2O...

The major use of PCBs, and so the main source of secondary environmental pollution by PCBs, is electrical equipment. In the UK, for example, it is estimated that over 90% of PCB emissions arise from leaks from transformers and capacitors and from fragmentising operations (APARG, 1995). Recent estimates of the European emissions in 1990 indicate that as much as 94% of PCB emissions come from thi...

Levels of polychlorinated byphenils (PCBs) were monitored continuously in Zagreb between June 1999 and February 2000 and analysed qualitatively and quantitatively using high resolution gas chromatography (HRGC). Total PCBs were determined with respect to Aroclor 1260, which was used as the standard reference. The concentrations of PCBs ranged from 1.6 to 136 pg/m3 and were higher in warmer seas...

With the increasing density of components on Printed Circuit, Boards (PCBs) and the a.dvancement of fabrication technologies for multilayer PCBs, improvement of speed and techniques for the Computer Aided Design of multilayer PCBs has become a major area of research. The paper discusses the parallel processing of layering and routing algorithms for design of multilayer PCBs on a network of smal...

As a number of reviews on different aspects of the toxicology of the PCBs have been written recently (1-4) no effort has been made in this report to give a complete outline of the animal toxicology. The material summarized in this report consists predominantly of more recently published information on toxic effects of PCBs in mammals and experimental studies in birds. Since Nelson et al. (3) di...