A Tale of Two Trees: Epigenetics Makes Clones Diverge
Some clone lines are quite old–that young maple on your street could be the genetic twin of a tree that lived in the 1850s. While clones have the same genes as each other, whether those genes are expressed the same way is a function of epigenetics....
July 12, 2011
Time (Eats) Flies: Clock Powers Itself by Catching & Eating Bugs
Cat clocks. Cuckoo clocks. Grandfather clocks. Often times, clocks are named after the objects, animals, or people they resemble. Not so the fly clock: This mechanical wonder is billed as the first-ever carnivorous clock, sucking energy from decomposed ...
March 28, 2011
Inside a Tree Leaf, It's Always a Balmy 70 Degrees
beech tree leaf Who knew that a white spruce in northern Canada, a red maple in Pennsylvania, and a mahogany tree in Puerto Rico have so much in common? Their environments are certainly very different, with icy winds buffeting the spruce tree's needles ...
June 22, 2008
What’s the News: Foresters have long noticed that trees with the exact same genes, when raised in separate nurseries, have very different responses to drought. Scientists have now found that twin trees raised separately are, just like human twins , expressing different genes. Commercially grown trees are often genetically identical: they are clones of some long-ago tree that had just the right traits for sandy soil or the shiniest apple. Some clone lines are quite old–that young maple on your street could be the genetic twin of a tree that lived in the 1850s. While clones have the same genes as each other, whether those genes are expressed the same way is a function of epigenetics. The addition of methyl tags to DNA bases, called methylation , is an epigenetic change that allows some genes to be transcribed while others are not. The team compared poplar tree clones grown in separate nurseries. But sure enough, when deprived of water, two of the three varieties showed diverging reactions depending on where trees were grown. Additionally, a survey of all the transcribed genes showed that the trees from one location were deploying one set to deal with drought while their twins from the other location were using another. They also noticed that the longer a particular variety had been grown as a clone—one poplar variety, for example,.
Their environments are certainly very different, with icy winds buffeting the spruce tree’s needles and hot, humid air bathing the mahogany tree’s leaves. But despite these external variations, a new study shows that inside each tree leaf (or needle) it’s always just the right temperature for the delicate and vital process of photosynthesis , and the leaves are responsible for keeping that... And trees that grow in cold places tend to cluster their leaves. These tight formations can affect the rate at which leaves lose heat on cold days, just as fingers pressed together in mittens stay warmer than fingers separated by space in gloves [ Science News ]. In another useful adjustment, trees can let... And while the researchers didn’t study rhododendrons, anyone who has grown the shrubs in a northern climate knows that the leaves roll up like cigars in cold weather to prevent losing moisture through the leaves. The team of ecologists from the University of Pennsylvania studied wood samples from 39 different species of trees, examining each for the presence of two oxygen isotopes that indicate the tree’s temperature while it was conducting photosynthesis.
You'll Go Cuckoo For This Gigantic Clock Carved Out Of A Single Tree
A remarkable cuckoo clock forged from a single maple tree is being used to crow about Portland, Oregon. Designed by Nicolas Gros and carved by chainsaw sculptor J. Chester Armstrong, the 24-foot-high, 7,000-pound clock is being shown off around the ...
November 26, 2014
River City Five Maple Leaves and One Bird One Day Hand-Carved Cuckoo Clock
This traditionally styled German cuckoo clock features wooden hands, a wood dial with Roman numerals, and a warm light yellow hand-painted and hand-carved cuckoo bird. The cuckoo clock case is surrounded by five deeply carved maple leaves with a single ...
December 10, 2013
Cuckoo clocks: It's time for an update
A bit of color will fly the bird-and-leaf-carved coop on the hour when ... This version, also battery powered, measures 7 inches wide and about 13 inches long. No matter which clock you go cuckoo for, these playful variations of an old fixture will uplift ...
November 5, 2011
Villengen Hand Carved Black Forest Cuckoo Clock
Styled after the traditional German Black Forest tradition, this cuckoo clock is a graphic, stylish addition to any room. Hand carved wood frame shows leaves and birds. Each hour the cuckoo makes an appearance. Precise quartz movement adds superior ...
September 7, 2010
LARGEST CUCKOO CLOCK IN THE WORLD/ Guiness Book of World Records
That building is a cuckoo clock. It has been entered in the Guiness book of world records since 1997 ... is a very popular hiking route in the Black Forest. The brown bird at the top is the "cuckoo" waiting for the hour to strike so it can go out and ...
May 9, 2010