Wooden Bone

New Artificial Bone Made of Wood
A new procedure to turn blocks of wood into artificial bones has been developed by Italian scientists, who plan to implant them into large animals, and eventually humans.

Wood-derived bone substitute should allow live bones to heal faster and more securely after a break than currently available metal and ceramic implants.

The researchers chose wood because it closely resemble the physical structure of natural bone, "which is impossible to reproduce with conventional processing technology."

"Our purpose is to convert native wood structures into bioactive, inorganic compounds destined to substitute portions of bone," said Anna Tampieri, a scientist at the Instituto Di Scienza E Techologia Dei Materiali Ceramici in Italy.

To create the bone substitute, the scientists start with a block of wood -- red oak, rattan and sipo work best -- and heat it until all that remains is pure carbon, which is basically charcoal.

The scientists then spray calcium over the carbon, creating calcium carbide. Additional chemical and physical steps convert the calcium carbide into carbonated hydroxyapatite, which can then be implanted and serves as the artificial bone.

The entire process takes about one week and costs about $850 for a single block. One block translates to about one bone implant.

Read more at: http://news.discovery.com/tech/artificial-bone-made-wood.html

Plant that fakes illness

Plant That Pretends To Be ILL
A plant that pretends to be ill has been found growing in the rainforests of Ecuador. The plants feigns sickness to stop it being attacked by insect pests known as mining moths, which would otherwise eat its healthy leaves.

It is the first known example of a plant that mimics being ill, and could also explain a common pattern seen on plant leaves known as variegation.

The discovery is published in the journal Evolutionary Ecology.

Variegation is familiar to gardeners and affects many species of plant. Variegated plants have different coloured patterns on the leaf surface, produced by a variety of causes.

One of the most common is when cells in the leaf lose chlorophyll and their ability to photosynthesise, appearing white.

In theory, plants with variegated leaves should be at a disadvantage, because of this restricted ability to photosynthesise.

But a chance discovery by a team of botanists suggests this may not be true after all. Instead, some variegated plants may be mimicking illness to avoid being eaten, putting themselves at an advantage.

Idea with potential for cross fertilization? Read more: http://news.bbc.co.uk/earth/hi/earth_news/newsid_8108000/8108940.stm