context studies on experimental animals have shown liver is a common target of chemical carcinogens; this might suggest that occupational exposure to chemicals is another risk factor for hcc. however, the relationship between occupation and liver cancer has not been extensively studied, with the exception of the known association between vinyl chloride and angiosarcoma of the liver. evidence ac...

Polychlorinated biphenyls (PCBs) cause many significant ecological problems because of their low degradability, high harmfulness, and solid bioaccumulation.Two bacterial strains were isolated from soil that had been polluted with electrical transformer liquid for more than 40 years. The isolates were distinguished as Lysinibacillus macrolides DSM54Tand Bacillus firmus NBRC1530...

A workshop on the Human Health Impacts of Halogenated Biphenyls and Related Compounds was held to assess the state of current research on these chemicals and to make recommendations for future studies. Participants discussed results from laboratory animal experiments on PCBs, PBBs, dioxins, and dibenzofurans which demonstrate a common mode of toxicological action while also revealing large vari...

Most of the studies on polybrominated biphenyls (PBB) have been on toxicological evaluations. Very few studies have dealt with their persistence and concentration potential in several environmental matrices such as soil, sediments, and biota as a function of matrix properties. The understanding of these relationships will form some basis for assessing the characteristics of the contaminant's be...

This study is focused on investigating the influence of the parameters for dechlorination of polychlorinated biphenyls (PCB) using electron beam. The dechlorination process was studied using concentrated solutions of polychlorinated biphenyls. 2-propanol with/without water, ethanol, 1,2,3,4-tetrahydronaphthalin and tetrahydrofurane were used as solvents. The results of the research showed that ...

Chronic ingestion of modest doses of dietary iodine, radiation, and polyhalogenated biphenyls (PCB's and PBB's) are environmental factors with known or suspected adverse effects on the human thyroid. Iodine consumption in the United States is approaching 1 mg daily for a large segment of the population. Data are reviewed which support the need for concern regarding the long-term adverse effects...

Introduction. Monitoring of organohalogens in the glaucous gull (Larus hyperboreus) has been given high priority in Svalbard (Norwegian Arctic). Glaucous gulls are distributed widely in the Arctic and are an important avian scavenger-predator in the marine food web. Thus far among circumpolar arctic seabirds, glaucous gulls from Svalbard are reported to accumulate some of the highest concentrat...

Several current-use (≤ 80 ng g⁻¹ dry weight) and organochlorine pesticides (≤ 15 ng g⁻¹ dry weight) and polychlorinated biphenyls (≤ 18 ng g⁻¹ dry weight) were found in the biodegradable fraction of source separated household waste, compost, and/or anaerobic digestate. The degradation rates of individual compounds differ depending on the treatment. Dieldrin and pentachloroaniline, e.g., degrade...

Dipolar splitting AH from proton-NMR experiments in 5-BCB, 5-8 OCB and PAA are presented and compared with the quantity Z, calculated from refractive index data, in the same set of compounds obtained by Bunning et al. [3]. According to these authors the quantity Z is rather insensitive to the biaxial terms in the ordering matrix and gives the best indication currently available of the temperatu...