Agriculture
Middle school science adventures
Hungry bug seeks hot meal
New Gene Fights Potato Blight
Amphibians
Salamanders
Frogs and Toads
Newts
Animals
Stunts for High-Diving Ants
Staying Away from Sick Lobsters
A Seabird's Endless Summer
Behavior
Memory by Hypnosis
Girls are cool for school
Wake Up, Sleepy Gene
Birds
Penguins
Carnivorous Birds
Quails
Chemistry and Materials
Picture the Smell
A Framework for Growing Bone
Meteorites may have sparked life on Earth
Computers
The hungry blob at the edge of the universe
Troubles with Hubble
Hubble trouble doubled
Dinosaurs and Fossils
Middle school science adventures
Three strikes wiped out woolly mammoths
Dinosaurs Grow Up
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
Explorer of the Extreme Deep
Life trapped under a glacier
Rocking the House
Environment
Pumping Up Poison Ivy
Pollution Detective
Lessons from a Lonely Tortoise
Finding the Past
Unearthing Ancient Astronomy
Ancient Art on the Rocks
Meet your mysterious relative
Fish
Pygmy Sharks
Freshwater Fish
Seahorses
Food and Nutrition
Moving Good Fats from Fish to Mice
A Taste for Cheese
The Color of Health
GSAT English Rules
Subject and Verb Agreement
Whoever vs. Whomever
Order of Adjectives
GSAT Exam Preparation Jamaica
GSAT Practice Papers | GSAT Mathematics | Maths
March 21-22, 2013: Over 43,000 students will take the GSAT Exam
Ministry of Education Announces 82 GSAT Scholarships for 2010
GSAT Exams Jamaica Scholarships
Results of GSAT are in schools this week
42,000 students will sit for the GSAT Exam in two weeks
GSAT stars reap scholarship glory
GSAT Mathematics
How to Slice a Cake Fairly
Math Naturals
GSAT Mathematics Quiz, Teaching Math, teaching anxiety
Human Body
Nature's Medicines
A Fix for Injured Knees
Speedy Gene Gives Runners a Boost
Invertebrates
Horseshoe Crabs
Ticks
Butterflies
Mammals
Persian Cats
Rhinoceros
Flying Foxes
Parents
What Not to Say to Emerging Readers
Raise a Lifelong Reader by Reading Aloud
How children learn
Physics
Speedy stars
Dreams of Floating in Space
Hold on to your stars, ladies and gentlemen
Plants
Bright Blooms That Glow
Farms sprout in cities
Cactus Goo for Clean Water
Reptiles
Turtles
Lizards
Caimans
Space and Astronomy
Asteroid Lost and Found
Supernovas Shed Light on Dark Energy
Cousin Earth
Technology and Engineering
Machine Copy
Smart Windows
Drawing Energy out of Wastewater
The Parts of Speech
What is a Verb?
Countable and Uncountable Nouns
Pronouns
Transportation
Robots on the Road, Again
Reach for the Sky
Middle school science adventures
Weather
A Dire Shortage of Water
Catching Some Rays
Science loses out when ice caps melt
Add your Article

Return of the Lost Limbs

When people lose legs after accidents or illnesses, emergency care and artificial limbs often allow them to walk again. But salamanders and newts in the same situation don't need doctors or artificial body parts. They can grow limbs back on their own. Scientists have known for a long time that certain animals can regenerate limbs, but they haven't quite figured out how these creatures do it. Researchers from University College London have now come up with some new insights. Their work may lead to breakthroughs that could eventually enable people, too, to regrow lost limbs. The researchers started with two simple observations: When you cut off a newt's leg at the ankle, only the foot grows back. If you cut off a leg at the base, the whole leg grows back. In both cases, the regrowth begins with stem cells . Stem cells are unspecialized cells that can develop into nearly any type of cell in the body. But how do a newt's stem cells know when to regrow only a foot and when to regrow an entire leg? This question relates to another mystery: In newts, a severed leg will grow back only if the bundle of nerves in it also grows back. But if something prevents the nerve bundle from growing, the stem cells at the site of the wound won't multiply to produce a new leg. In its study, the British team zeroed in on a protein called nAG. When the team prevented nerves in a limb from growing, but added the nAG protein to stem cells in the limb, the limb still regrew. The scientists suspect that nerves in the stub of a limb signal the release of the nAG protein. That protein seems to guide limb regrowth. People and other mammals have proteins that are similar to nAG. Further research into these compounds may some day help human limbs and organs heal themselves.—Emily Sohn

Return of the Lost Limbs
Return of the Lost Limbs








Designed and Powered by HBJamaica.com™