Agriculture
Fast-flying fungal spores
Flush-Free Fertilizer
Springing forward
Amphibians
Salamanders
Poison Dart Frogs
Salamanders and Newts
Animals
Fishing for Giant Squid
How to Fly Like a Bat
No Fair: Monkey Sees, Doesn't
Behavior
Girls are cool for school
World’s largest lizard is venomous too
Pondering the puzzling platypus
Birds
Eagles
Doves
Storks
Chemistry and Materials
Moon Crash, Splash
Silk’s superpowers
Gooey Secrets of Mussel Power
Computers
Graphene's superstrength
Seen on the Science Fair Scene
Games with a Purpose
Dinosaurs and Fossils
Winged Insects May Go Way Back
Dinosaurs Grow Up
Early Birds Ready to Rumble
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
Salty, Old and, Perhaps, a Sign of Early Life
What is groundwater
Rodent Rubbish as an Ice-Age Thermometer
Environment
When Fungi and Algae Marry
Inspired by Nature
Missing Tigers in India
Finding the Past
Ancient Cave Behavior
A Human Migration Fueled by Dung?
The Taming of the Cat
Fish
Basking Sharks
A Jellyfish's Blurry View
Puffer Fish
Food and Nutrition
Packing Fat
Turning to Sweets, Fats to Calm the Brain
Recipe for Health
GSAT English Rules
Order of Adjectives
Who vs. Whom
Whoever vs. Whomever
GSAT Exam Preparation Jamaica
March 21-22, 2013: Over 43,000 students will take the GSAT Exam
Scotiabank Jamaica Foundation Grade Six Achievement Test (GSAT) Scholarships
How are students placed after passing the GSAT exam
GSAT Exams Jamaica Scholarships
GSAT Practice Papers | GSAT Mathematics | Maths
GSAT Scholarship
42,000 students will sit for the GSAT Exam in two weeks
GSAT Mathematics
Math and our number sense: PassGSAT.com
Losing with Heads or Tails
How a Venus Flytrap Snaps Shut
Human Body
Flu Patrol
Heart Revival
Sleeping Soundly for a Longer Life
Invertebrates
Sea Urchin
Giant Clam
Crabs
Mammals
German Shepherds
Otters
Caribou
Parents
Children and Media
What Not to Say to Emerging Readers
Choosing a Preschool: What to Consider
Physics
The Particle Zoo
Strange Universe: The Stuff of Darkness
One ring around them all
Plants
Pumping Up Poison Ivy
Fastest Plant on Earth
White fuzzy mold not as friendly as it looks
Reptiles
Tortoises
Reptiles
Sea Turtles
Space and Astronomy
Tossing Out a Black Hole Life Preserver
Ready, Set, Supernova
No Fat Stars
Technology and Engineering
A Satellite of Your Own
A Micro-Dose of Your Own Medicine
Shape Shifting
The Parts of Speech
Problems with Prepositions
What is a Noun
What is a Verb?
Transportation
Robots on a Rocky Road
Tinkering With the Basic Bike
Flying the Hyper Skies
Weather
Warmest Year on Record
In Antarctica watch the heat (and your step)
Science loses out when ice caps melt
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™