Stem cells serve as a repair mechanism - replacing diseased cells with healthy new ones.

Currently, tumour cells are difficult to spot, even under powerful magnification, but these new glasses will allow surgeons to distinguish between diseased cells and healthy ones.

This would, for example, help surgeons to remove diseased cells that might produce new tumours.

Presumably, therapeutic effect can be obtained by provoking a selective response against the diseased cells only.

Stern was one of the first scientists specializing in cytopathology, the study of diseased cells.

Worldwide, more than 1.3 million patients with diseased heart valves require surgery to replace them each year.

They take skin stem cells, 're-programme' them in the laboratory then graft them on to the diseased heart.

Many affected individuals also have heart disease, often involving enlarged or diseased heart valves.

Rip open the diseased heart of a corporation and what spills out?

But then again, we have always known humanity to be a species of diseased hearts.

Most leaves of a diseased plant are usually affected.

Diseased plant material will remain infectious until completely broken down.

Rhododendrons and the heathland bilberry have also been affected and diseased plants have infected some adjacent trees.

Meanwhile, 300,000 acres of diseased plants were destroyed.

The diseased plants had variegated leaves that were mottled.

Farmers have blamed local politicians for dithering over the felling of diseased trees that helped the bacterium to spread.

Offcuts that the timber industry would not use, and diseased trees, are also favoured.

The symptoms are not always easy to spot and diseased trees could still enter the country unnoticed, they say.

He dug up our septic tank, cut diseased trees, and simply spent time with us.

In an attempt to preserve the site, university officials have agreed to fell the diseased trees and plant hazel and hawthorns instead.

Established apples and pears can have dead and diseased wood cut out.

Remove weak, dead and diseased wood, as well as branches that cross over each other.

Prune out any dead and diseased wood from roses.

Start with dead, dying or diseased wood.

Roses are fantastic value for money and you can give yours a head start in spring by feeding them and pruning out unwanted, damaged or diseased wood.