Articles tagged with Polychlorinated Biphenyls
The American Chemical Society's National Meeting features groundbreaking research on targeting cancer stem cells and advancing anti-cancer drugs. Additionally, scientists discuss the chemistry behind high-speed racing and strategies to increase diversity in STEM fields.
A new technology from the University of Calgary destroys hazardous chemical compounds in soil using UV light, promising a safer and cheaper way to clean up PCBs. The mobile cleanup unit is ready for field-testing on PCB-contaminated soil and estimates to cost $350 to $500 per tonne.
A new Dartmouth study finds that many people fear low amounts of chemicals in their food, despite being inherently harmless and often beneficial. The study argues that regulators should focus on pathogens and bacteria rather than pesticides and synthetic chemicals.
A Johns Hopkins study of 50 pregnant women found associations between higher exposure to DDT and other contaminants and increased fetal motor activity, as well as reduced fetal heart rate accelerations. The findings suggest the developing fetus is susceptible to environmental exposures, highlighting the need for prenatal protection.
Researchers at the University of Iowa found similar PCB concentrations in mothers and children from East Chicago and Columbus Junction, challenging long-held assumptions about urban-rural differences in chemical exposure. The study detected a greater variety of PCBs in the blood of mothers and children in East Chicago, but ultimately s...
A study found that some organic cheeses in Spain have higher concentrations of polychlorinated biphenyls (PCBs) than recommended by the EU. The presence of these toxins has been linked to health risks such as cancer, obesity, and diabetes.
Nearly 23% of American women aged 16-49 have high levels of lead, mercury, and PCBs in their blood. Risk factors include age, fish consumption, heavy drinking, and breastfeeding. Women should learn about their risks before becoming pregnant.
A preliminary study by researchers at the National Institutes of Health found that couples with high levels of polychlorinated biphenyls (PCBs) and similar environmental pollutants take longer to achieve pregnancy. The study suggests a possible link between exposure to these pollutants and pregnancy delay.
A study of 240 children found that those with higher levels of polychlorinated biphenyls (PCBs) were more likely to report wheeze, a common symptom of asthma. Non-atopic asthma was also linked to PCB exposure in the study.
Exposure to environmental chemicals like PCBs in the womb causes long-term changes to the developing brain, leading to delayed puberty and disrupted reproductive cycles. The study identified five genes critical to normal hypothalamic control of reproduction, providing a potential target for interventions.
A new study published in Obesity found a correlation between PCB exposure and increased distribution of body fat to the abdomen. Researchers analyzed data from over 1,000 70-year-olds and found that high levels of PCB189 were related to a high proportion of visceral fat.
New research from UC Davis and Washington State University shows that PCBs disrupt normal brain development by promoting excessive dendrite growth and altering cellular signaling pathways. This may increase the likelihood of autism spectrum disorders in children with a genetic predisposition.
A Norwegian University of Science and Technology study found that polar bear cubs in Svalbard have lower blood levels of PCBs and related contaminants, indicating a decline in exposure to these toxic chemicals. The levels of contaminants in mother bears' blood also decreased, suggesting reduced transmission from mothers to their cubs.
Researchers analyzed soils in Cedar Rapids for industrial pollutants like PCBs and chlordanes, finding levels similar to other urban/industrial sites globally. The study highlights the need for caution regarding contaminated soil as a source of exposure to persistent organic pollutants.
Research finds that exposure to PCB 126 affects turtles' growth, leading to lower bone density, thinner eggshells, and softer shells. The study provides insights into the environmental impact of PCBs on humans.
Scientists have developed new approaches to boost the effectiveness of enzymes involved in breaking down toxic pollutants such as PCBs. By modifying amino acids and updating mechanisms, researchers can create more flexible mutant enzymes that can metabolize a wider range of substrates.
A recent study found high concentrations of polychlorinated biphenyls (PCBs) in the deep sediments of the Indiana Harbor and Ship Canal, posing a risk to human health and the environment. The discovery was made by researchers from the University of Iowa Health Care, who used submersible vibro-coring systems to collect sediment samples.
Hanadi Rifai will test parts of Galveston Bay for dioxins and PCBs to identify the source of pollutants and determine concentrations in marine life. Her findings will help state officials develop effective management strategies, including bioremediation and commercial fishing bans.
Researchers found that bottlenose dolphins and beluga whales accumulate more chemical pollutants when living and feeding in waters near urbanized areas. POPs were detected in the highest concentrations, with PCBs being the most prevalent pollutant.
Research reveals high concentrations of carcinogenic PCBs in West Africa's coastal regions, with possible sources including illegal waste dumping and ship graveyard pollution. The study collected air samples from ships and land-based stations, pointing to the large ships' graveyard in Mauritania as a significant source of contamination.
A study found that a population of Hudson River fish evolved rapidly in response to PCB pollution, with a single gene responsible for their ability to withstand the toxic chemicals. The study's findings suggest that this genetic adaptation allowed the fish to survive lethal heart defects triggered by PCBs.
A study by Woods Hole Oceanographic Institution reveals that Atlantic tomcod have developed a genetic resistance to PCBs, allowing them to thrive in the polluted Hudson River. The researchers identified a single genetic receptor responsible for this adaptation, which may also impact their ability to break down other harmful chemicals.
Scientists have documented elevated levels of PCBs and PBDEs in carp from eastern Lake Erie, which can disrupt endocrine systems and cause health issues. The findings highlight the lasting effects of human activity on the Great Lakes' ecosystem.
Research reveals widespread internal exposure of humans to cosmetic UV filters, found in 85% of human milk samples, comparable to PCBs. The presence of UV filters is correlated with the use of cosmetic products containing these filters.
A new study has revealed that both low-income and affluent communities in California have high levels of endocrine disruptors in their homes, with indoor air pollution posing a significant health risk. The study, which analyzed indoor and outdoor air samples from 40 low-income and 10 affluent homes, found that levels of these substance...
The University of Iowa Superfund Research Program has received a five-year, $16 million grant to investigate the health impacts of polychlorinated biphenyls (PCBs) in water, soil, and air. The program will also explore novel clean-up methods using plants.
A University of Iowa study measures the levels of polychlorinated biphenyls (PCBs) in sediments, water, suspended particles, and air along the Indiana Harbor and Ship Canal. The study finds that PCBs are a significant source of pollution, with annual emissions estimated at 4 kg to water and 7 kg to air.
Researchers confirm high levels of PCBs in IHSC sediments, sparking concerns about dredging's environmental impact. The study highlights the need for further investigation into the effects of dredging on sediment PCB levels and potential health hazards to humans.
Researchers detected low concentrations of polychlorinated biphenyls (PCBs) on Aconcagua Mountain, indicating that mountain ranges can trap persistent organic pollutants. The findings suggest a need to investigate the role of mountains in spreading pollutants and associated risks.
Researchers found PAHs in house dust near coal-tar-based sealcoat and used spiders as sentinels for contaminants in aquatic ecosystems. African dust carried persistent organic contaminants and metals across the ocean affecting native species. Scientists also explored using pheromones to control invasive Asian carp.
A study found high concentrations of pollutants in marine mammals' brains, including pesticides like DDTs and PCBs, as well as brominated flame retardants. The results have significant implications for the health of marine mammals, particularly their hearing and cognitive development.
UC Davis researchers found that low levels of PCBs alter brain cell development and excitability, explaining the association between PCB exposure and behavioral deficits in children. The studies show how PCBs affect dendritic plasticity, a key characteristic of neuronal development.
A study by University of Iowa researchers found PCB11, a toxic substance linked to paint pigments, present throughout Chicago air. The compound was detected in 91% of samples collected between 2006 and 2007, raising concerns over human health implications.
Clemson University environmental chemist Cindy Lee receives NSF funding to investigate how PCBs cycle through fish and other organisms before reaching consumers. Her research aims to track the changes in PCB behavior and determine their impact on human brain development.
Women exposed to high levels of polychlorinated biphenyls (PCBs) are more likely to give birth to female children. A study found that for every one microgram of PCBs per liter of serum, the chance of having a male child fell by 7%. The researchers suggest that high maternal PCB concentrations may favor fertilization by female sperm or ...
A new study reports finding persistent organic pollutants in deep-sea cephalopods, including octopods and squids. The presence of these chemicals suggests contamination of the deep-ocean food web is occurring, with significant implications for marine life.
Researchers discovered that phospholipase C zeta (PLCZ1) promotes calcium oscillations in egg activation, but its nuclear translocation differs among species. Additionally, a study showed that exposure to polychlorinated biphenyls (PCBs) can disrupt reproductive markers in rats and their grand offspring.
Research finds higher serum levels of certain organochlorine compounds in mothers correlate with increased incidence of undescended testicles and hypospadias in sons. Maternal exposure to endocrine-disrupting chemicals may contribute to urologic conditions, highlighting the importance of regular well-baby checkups.
Researchers found that old wood floor finishes in some homes can lead to significant PCB exposure, even exceeding levels found in the general population. The study suggests that these finishes, particularly those containing the chemical Fabulon, may harbor high levels of polychlorinated biphenyls.
Research team finds PCBs and DDE in Chicago night-heron eggs, but no negative effects on reproduction. Populations remain stable amidst ongoing contamination from Lake Michigan.
UC Riverside scientists warn that chemicals used to slow the spread of fires in consumer goods, such as televisions and sofas, can be found in high concentrations in human blood and breast milk. Long-term exposure to these chemicals may pose a health risk, particularly for infants and toddlers.
Researchers found that a specific class of PCB causes significant developmental abnormalities in rat pups whose mothers were exposed to the toxicant during pregnancy and early nursing. The study suggests that non-coplanar PCBs may be particularly hazardous due to their stability and prevalence in environmental samples.
Researchers at Rensselaer Polytechnic Institute have identified a bacterium that can dechlorinate polychlorinated biphenyls (PCBs) in situ, eliminating the need for dredging. The Dehalococcoides bacteria thrive on PCBs, replacing chlorines with hydrogen to initiate degradation.
A comprehensive analysis of fish consumption found that moderate intake reduces risk of coronary heart disease by 36% and total mortality by 17%. The benefits of omega-3 fatty acids from seafood also improve early brain development in infants, particularly when consumed by pregnant or nursing mothers.
A review of studies found that moderate fish consumption reduces coronary death by 36% and death rate by 17%. The study suggests that adequate consumption of other seafood is essential to minimize methylmercury exposure and ensure DHA intake.
A new study found that exposure to polychlorinated biphenyls (PCBs) in children may lower the effectiveness of vaccines against tetanus and diphtheria. PCB contamination was associated with decreased antibody responses to vaccinations at both 18 months and 7 years old.
A new study has found significant regional differences in ocean contamination levels among albatrosses, with black-footed albatrosses foraging in the California Current exhibiting higher concentrations of mercury and organochlorine compounds. The findings suggest that these contaminants build up in the tissues of animals high on the fo...
Researchers have found a potential association between high blood levels of PCBs and furans with an increased risk of developing non-Hodgkin lymphoma. The study analyzed blood samples from 100 healthy volunteers and 100 non-Hodgkin lymphoma patients, revealing a link between three specific molecular forms of PCBs and cancer development.
A study found that exposure to persistent organochlorine pollutants like CB-153 and DDE is significantly associated with a high prevalence of type 2 diabetes among fishermen and their wives. The results show that those with higher blood levels of these pollutants have a higher risk of developing the disease.
A European study found that PCBs and DDT may damage sperm DNA, leading to higher levels of DNA fragmentation in men exposed to high levels of these pollutants. However, the researchers found no dramatic effects on human fertility and emphasized the need for further research.
Researchers found that certain dietary chemical compounds, such as PCBs, increase the risk of colon cancer by causing genetic alterations in genes like K-Ras and p53. The study suggests that diet plays a significant role in colorectal cancer development, with fat, red meat, and excessive calorie consumption being major risk factors.
Researchers isolated compounds from whale blubber and used radiocarbon analysis to determine their source. The findings suggest that natural products also accumulate in animals, challenging the assumption that only industrial compounds do so.
A study published in NeuroToxicology reveals that polychlorinated biphenyls (PCBs) and low levels of maneb, a fungicide, can disrupt dopamine neurons and oxidative stress responses in the brain. This research aims to better understand Parkinson's disease and develop therapies to prevent or slow its progression.
Researchers found that combined dietary olestra and caloric restriction increased the rate of excretion of a test toxin by 30-fold and reduced its distribution into the brain by 50%. The study also showed that weight loss and regain resulted in changes to the concentration of toxins in adipose tissue and liver.
Researchers find that pumpkins are effective in removing DDT and other pollutants from contaminated soils through phytoremediation. The study suggests a potential inexpensive and environmentally friendly alternative to traditional methods of soil cleanup.
Scientists at Indiana University and the EPA will study the circulation of polychlorinated biphenyls (PCBs) between the air and Great Lakes, aiming to inform new clean-up policies. Elevated PCB levels have led to fish consumption advisories for all five Great Lakes, with implications for human health.
Researchers have discovered key aspects of PCB fate in sediment and developed methods to monitor and contain these synthetic compounds. They found that bacteria populations decompose PCBs differently in sediments taken from separate, contaminated rivers.
A Carnegie Mellon researcher has developed a reactive core mat technology that can clean up pollutants in the Anacostia River. The innovative solution could provide a more affordable alternative to expensive dredging methods, which have costs running into the hundreds of millions of dollars.
Researchers studied sediments from two contaminated rivers and found that bacteria in Hudson River sediment were faster at digesting PCBs compared to those in Grasse River sediment. The team aims to identify nutrients or factors that can accelerate PCB breakdown in sediments without dredging.
A recent study published in Environmental Science & Technology found that farmed salmon have significantly higher levels of flame retardants, including polybrominated diphenyl ethers (PBDEs), than wild salmon. Wild Chinook salmon from British Columbia showed the highest average PBDE levels.