Agriculture
Flush-Free Fertilizer
Watching out for vultures
Chicken Eggs as Drug Factories
Amphibians
Bullfrogs
Frogs and Toads
Toads
Animals
A Seabird's Endless Summer
Eyes on the Depths
New Elephant-Shrew
Behavior
Dino-bite!
The nerve of one animal
A brain-boosting video game
Birds
Ducks
Nightingales
Emus
Chemistry and Materials
These gems make their own way
The metal detector in your mouth
Hair Detectives
Computers
Programming with Alice
Galaxies on the go
Getting in Touch with Touch
Dinosaurs and Fossils
Big Fish in Ancient Waters
Meet the new dinos
An Ancient Spider's Web
E Learning Jamaica
2014 GSAT Results for Jamaican Kids
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Results of GSAT are in schools this week
Earth
Detecting an Eerie Sea Glow
A Volcano Wakes Up
A Dire Shortage of Water
Environment
Will Climate Change Depose Monarchs?
Cactus Goo for Clean Water
An Ocean View's Downside
Finding the Past
A Long Haul
A Plankhouse Past
Prehistoric Trips to the Dentist
Fish
Basking Sharks
A Jellyfish's Blurry View
Electric Ray
Food and Nutrition
Chew for Health
Recipe for Health
In Search of the Perfect French Fry
GSAT English Rules
Who vs. Whom
Whoever vs. Whomever
Capitalization Rules
GSAT Exam Preparation Jamaica
Scotiabank Jamaica Foundation Grade Six Achievement Test (GSAT) Scholarships
10 Common Mistakes When Preparing for the GSAT Math Test
Ministry of Education Announces 82 GSAT Scholarships for 2010
GSAT Exams Jamaica Scholarships
GSAT Scholarship
Access denied - Disabled boy aces GSAT
Results of GSAT are in schools this week
GSAT Mathematics
Math of the World
10 Common Mistakes When Preparing for the GSAT Math Test
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Human Body
Walking to Exercise the Brain
Workouts: Does Stretching Help?
Germ Zapper
Invertebrates
Flatworms
Spiders
Horseshoe Crabs
Mammals
Bats
Seal
Glider
Parents
The Surprising Meaning and Benefits of Nursery Rhymes
Raise a Lifelong Reader by Reading Aloud
How children learn
Physics
Strange Universe: The Stuff of Darkness
Gaining a Swift Lift
Electric Backpack
Plants
Nature's Alphabet
Plants Travel Wind Highways
White fuzzy mold not as friendly as it looks
Reptiles
Chameleons
Rattlesnakes
Tortoises
Space and Astronomy
Cousin Earth
Phantom Energy and the Big Rip
Melting Snow on Mars
Technology and Engineering
Roll-Up Computer Monitors to Go
A Satellite of Your Own
Beyond Bar Codes
The Parts of Speech
Problems with Prepositions
Pronouns
What is a Preposition?
Transportation
Charged cars that would charge
Middle school science adventures
Where rivers run uphill
Weather
The solar system's biggest junkyard
Catching Some Rays
Where rivers run uphill
Add your Article

The mercury in that tuna

Eating fish can be good for you: It builds the brains of babies and helps the hearts of grown-ups. And eating fish can be bad for you: Fish from around the world swim in waters polluted with mercury, which gets into some fish, which gets into you when you take a bite. It can be tough to figure out which types of fish — and how much — a person can eat. But with a little reading and good information, a person can still eat fish and be healthy. In recent weeks, researchers have come up with some advice for how to get the fishy benefits and avoid the toxic mercury. Take tuna as an example. There are many different species of tuna, but grocery stores and restaurants often sell it without specifying which kind. But the amount of mercury tends to vary with the type of tuna. In one of the new studies, researchers studied 100 samples of sushi tuna purchased from grocery stores and restaurants. Jacob Lowenstein, a scientist at Columbia University in New York City, worked on the study. Sushi is a Japanese style of food presentation, usually involving fish that is served raw. Lowenstein and his colleagues studied the genetic material in the cells of the tuna. They discovered that the tuna came from three types: bigeye, bluefin and yellowfin species. As the scientists expected, bigger fish had more mercury. So tuna that came from yellowfin, the smallest type on average, had less mercury than tuna from bluefin, which are larger. But the scientists were surprised to discover that restaurant tuna contained more mercury than fish from the grocery store. Worse, yet, restaurant tuna had, on average, more mercury than the maximum amount recommended by the U.S. Environmental Protection Agency, or EPA. The EPA recommends that fish not contain more than 0.5 parts per million of mercury. The tuna from restaurants had 0.75 parts per million, on average, and some restaurant samples had levels as high as 1 to 2 parts per million. These numbers may seem small, but long term ingestion of even tiny amounts of mercury can lead to heart or nervous-system disease. As a result of their study, Lowenstein and his colleagues recommend that government “health agencies should consider adding bigeye and bluefin tuna to mercury advisories.” These advisories caution that people, especially pregnant women and young children, should avoid certain types of fish. Mercury is neurotoxic, which means it can injure developing brains. In another study, scientists from the University of Nevada Las Vegas looked at three kinds of canned tuna: solid-white, chunk-white and chunk-light. On average, light tuna had 0.28 parts per million, which is safely below the EPA’s recommendation. But solid and chunk-white types averaged 0.5 parts per million, right at the level of concern. The researchers calculated that a 55-pound child can safely eat only one serving every two weeks. The Nevada scientists recommend that government agencies be stricter about allowable mercury levels in fish. The EPA, the researchers recommend, should produce a clear policy that will tell people how much mercury they can consume — and where it comes from. The scientists would like to see a similar policy from the Food and Drug Administration (FDA). Right now, the FDA safety limit is 1 part per million, or twice that of the EPA. In a third study, Edward Groth III studied FDA's database that documents mercury contamination in 51 different types of fish and found that some types have 100 times the amount of mercury typically found in other types. This means there is no easy rule about mercury and fish — it depends on the species of fish and how contaminated the waters were in which it had lived. Groth produced a chart to make it easy for consumers to check the mercury content of the fish they’re about to eat or buy. The chart is small enough for a person’s pocket. In June, experts from around the world will get together in Stockholm, Sweden, to develop a world policy on mercury. Mercury can come from natural sources, like volcanoes, but it is also pollution produced by industrial sources like coal-fired power plants. Once mercury gets in the water and into the fish, it can get into you. But in this case, a little information can go a long way in keeping the mercury at bay.

The mercury in that tuna
The mercury in that tuna








Designed and Powered by HBJamaica.com™