6 hours ago by Robyn Mills <\/p>\n
(Phys.org) University of Adelaide researchers are using nanotechnology and the fossils of single-celled algae to develop a novel chemical-free and resistance-free way of protecting stored grain from insects. <\/p>\n
The researchers are taking advantage of the unique properties of these single-celled algae, called diatoms. Diatoms have been called Nature's nanofabrication factories because of their production of tiny (nanoscale) structures made from silica which have a range of properties of potential interest for nanotechnology. <\/p>\n
\"One area of our research is focussed on transforming this cheap diatom silica, readily available as a by-product of mining, into valuable nanomaterials for diverse applications - one of which is pest control,\" says Professor Dusan Losic, ARC Future Fellow in the University's School of Chemical Engineering. <\/p>\n
Their research is being presented at this week's ICONN2014-ACMM23 conference for nanoscience and microscopy being hosted by the University of Adelaide at the Adelaide Convention Centre. <\/p>\n
\"There are two looming issues for the world-wide protection against insect pests of stored grain: firstly, the development of resistance by many species to conventional pest controls - insecticides and the fumigant phosphine - and, secondly, the increasing consumer demand for residue-free grain products and food,\" Professor Losic says. <\/p>\n
\"In the case of Australia, we export grain worth about $8 billion each year - about 25 million tonnes - which could be under serious threat. We urgently need to find alternative methods for stored grain protection which are ecologically sound and resistance-free.\" <\/p>\n
The researchers are using a natural, non-toxic silica material based on the 'diatomaceous earths' formed by the fossilisation of diatoms. The material disrupts the insect's protective cuticle, causing the insect to dehydrate. <\/p>\n
\"This is a natural and non-toxic material with a significant advantage being that, as only a physical mode of action is involved, the insects won't develop resistance,\" says Professor Losic. <\/p>\n
\"Equally important is that it is environmentally stable with high insecticidal activity for a long period of time. Therefore, stored products can be protected for longer periods of time without the need for frequent re-application.\"<\/p>\n
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Using nanotechnology to protect grain exports<\/a><\/p>\n","protected":false},"excerpt":{"rendered":" 6 hours ago by Robyn Mills (Phys.org) University of Adelaide researchers are using nanotechnology and the fossils of single-celled algae to develop a novel chemical-free and resistance-free way of protecting stored grain from insects. The researchers are taking advantage of the unique properties of these single-celled algae, called diatoms. Diatoms have been called Nature's nanofabrication factories because of their production of tiny (nanoscale) structures made from silica which have a range of properties of potential interest for nanotechnology. Continue reading