Agriculture
Making the most of a meal
Growing Healthier Tomato Plants
Getting the dirt on carbon
Amphibians
Poison Dart Frogs
Tree Frogs
Frogs and Toads
Animals
Roboroach and Company
Living in the Desert
A Meal Plan for Birds
Behavior
Mice sense each other's fear
The Disappearing Newspaper
Hitting the redo button on evolution
Birds
Cassowaries
Eagles
Crows
Chemistry and Materials
Unscrambling a Gem of a Mystery
The chemistry of sleeplessness
When frog gender flips
Computers
Seen on the Science Fair Scene
Troubles with Hubble
Programming with Alice
Dinosaurs and Fossils
South America's sticky tar pits
Dinosaurs Grow Up
Middle school science adventures
E Learning Jamaica
2014 GSAT Results for Jamaican Kids
Results of GSAT are in schools this week
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Earth
Springing forward
The Pacific Ocean's Bald Spot
What is groundwater
Environment
Improving the Camel
Plant Gas
Shrimpy Invaders
Finding the Past
A Big Discovery about Little People
A Human Migration Fueled by Dung?
Prehistoric Trips to the Dentist
Fish
Flashlight Fishes
Flounder
Lampreys
Food and Nutrition
Strong Bones for Life
Making good, brown fat
Yummy bugs
GSAT English Rules
Whoever vs. Whomever
Problems with Prepositions
Who vs. Whom
GSAT Exam Preparation Jamaica
March 21-22, 2013: Over 43,000 students will take the GSAT Exam
Results of GSAT are in schools this week
10 Common Mistakes When Preparing for the GSAT Math Test
GSAT Exams Jamaica Scholarships
GSAT Exam Preparation
GSAT Scholarship
GSAT stars reap scholarship glory
GSAT Mathematics
Prime Time for Cicadas
Losing with Heads or Tails
Detecting True Art
Human Body
A New Touch
Cell Phones and Possible Health Hazards
Disease Detectives
Invertebrates
Daddy Long Legs
Sea Anemones
Oysters
Mammals
Raccoons
Lhasa Apsos
Spectacled Bear
Parents
How children learn
What Not to Say to Emerging Readers
The Surprising Meaning and Benefits of Nursery Rhymes
Physics
Spin, Splat, and Scramble
Project Music
Gaining a Swift Lift
Plants
The algae invasion
Pumping Up Poison Ivy
Hungry bug seeks hot meal
Reptiles
Cobras
Gila Monsters
Snakes
Space and Astronomy
A Galaxy Far, Far, Far Away
Ringing Saturn
Asteroid Lost and Found
Technology and Engineering
Beyond Bar Codes
Machine Copy
Weaving with Light
The Parts of Speech
What is a Preposition?
What is a Verb?
Countable and Uncountable Nouns
Transportation
Revving Up Green Machines
Robots on a Rocky Road
Flying the Hyper Skies
Weather
Arctic Melt
Weekend Weather Really Is Different
Catching Some Rays
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™