Effects of polychlorinated biphenyl pcb

Indications of allergy include, but not limited to sneezing, itching, skin rashes, and queasiness. Amino Acid An organic acid containing the amino group NH2. Any of the alpha-amino acids that are the chief components of proteins manufactured by living cells.

Effects of polychlorinated biphenyl pcb

In a study released in the February journal Science, researchers found that human activity -- from over-fishing to greenhouse gases and global warming to the introduction of toxins into the environment — has affected every square mile of ocean on the planet and strongly impacted roughly 40 percent of marine ecosystems.

Worse yet is the alarming growth in cancer cases. Many scientists around the world believe these illnesses are being caused by contamination of the ocean with man-made toxic chemicals. Because marine mammals are at the top of their food chain, the toxins in their food sources accumulates in their bodies, especially in their fatty tissues and breast milk.

Toxins in plankton are consumed by small fish, which are in turn eaten by larger fish, which are eaten by even larger fish. Eventually marine mammals and humans, each higher up the food chain, eat the now-toxic fish, further concentrating the toxins.

This bio-concentration is what causes high levels of toxins in dolphins, whales, and other marine mammals. Nine of the 10 species with the highest polychlorinated biphenyl PCB levels are marine mammals. The Toxic Top Ten: The declining health of ocean-going mammals, especially the increase in various cancers, sends an undeniable message to humans.

Thus dolphins and other marine mammals are showing us our future — unless we change our ways.

The problem of plastics

Marine mammals are sending an unambiguous message to humankind: Toxic Chemicals in The Ocean Environment Scientists have been finding higher and higher levels of man-made chemicals in marine mammal bodies, which have corresponded with increases in mass die-offs, otherwise inexplicable population declines and strandings.

They have found that many of these events are associated with immune system dysfunction, suggestive of broad environmental distress in the oceans. Environmental toxins are spread by wind, rain and currents.

Thus, the toxic waste of one area, such as the United States and now Asia, where industrialized development and contamination are growing rapidly, become the toxic problems of the world. POPs resist environmental breakdown via biological, chemical and photolytic processes, some taking as long as a century to degrade to a safe level.

Even if we totally banned the use of POPs tomorrow, the health problems they cause would remain for many generations. Today new contaminants are a growing problem in marine eco-systems.

Polybrominated diphenyl ethers PBDEs are flame retardants used in 85 percent of commercial plastics, foam and textiles.

Effects of polychlorinated biphenyl pcb

We are surrounded by them. They are found in computers, television sets, cars, furniture fabrics, foam mattresses, and indoor dust. PBDE concentrations are doubling every four years in marine mammals, according to one study. They are similar in chemical structure to PCBs and are particularly found in very high levels world-wide in harbor seal pups.The Effects of Ocean Pollution on Marine Mammals By Bob Bohle The impact of humans has now reached every square mile of Earth’s oceans, and implications are .

Polychlorinated biphenyls (PCB) produced ultrastructural lesions in thyroid follicular cells and reductions in serum thyroxine levels in rats that were time- and dose-dependent.

The acute effects (4 week) of PCB (50 and ppm) consisted of an accumulation of lysosomal bodies and colloid droplets in follicular cells with abnormalities of microvilli . a Not reported, NR [return to table]. Mice, rats, guinea pigs, and monkeys displayed progressive weight loss with death occurring up to several weeks after administration of a single lethal dose of PCB.

The chemicals targeted by the Stockholm Convention are listed in the annexes of the convention text: Annex A (Elimination). Parties must take measures to eliminate the production and use of the chemicals listed under Annex A.

Bioline International Official Site (site up-dated regularly)

Specific exemptions for use or production are listed in the Annex and apply only to Parties that register for them. Polychlorinated biphenyl: Polychlorinated biphenyl (PCB), any of a class of organohalogen compounds prepared by the reaction of chlorine with biphenyl. A typical mixture of PCBs may contain over compounds and is a colourless, viscous liquid.

The mixture is relatively insoluble in water, is stable at high temperatures. Polychlorinated Biphenyls (PCBs) are man-made persistent organic chemicals that have many negative impacts on the environment and on human health.

Effects of polychlorinated biphenyl pcb

At one time, PCBs were widely used in both industrial and commercial applications, but have now been banned since ¹.

Scientific Facts on PCBs Polychlorinated biphenyls