<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/03c224df-3c9f-4c4b-a8d3-11869c9ade71/3644E998-16F5-4C34-83BD-D25CF1459B25/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.wired.com/wiredscience/2009/10/magnetic-leaf-pollution/" href="http://www.wired.com/wiredscience/2009/10/magnetic-leaf-pollution/" style="font-size: 11px;">www.wired.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.wired.com/wiredscience/2009/10/magnetic-leaf-pollution/"><div align="center"><img src="http://content8.clipmarks.com/blog_cache/www.wired.com/img/917A44E4-E6E7-4BE5-9F02-BF21F7910F9F" alt="magneticleaves2" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.wired.com/wiredscience/2009/10/magnetic-leaf-pollution/"><P>PORTLAND, Oregon — Foliage on trees lining traffic routes could serve as low-tech pollution sensors, a new analysis suggests.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.wired.com/wiredscience/2009/10/magnetic-leaf-pollution/"><P>When Housen and university colleague Luigi Jovane analyzed leaves collected at several sites along streets in Bellingham, they found that the leaves along bus routes were as much as 10 times more magnetic than leaves collected on quieter residential streets. That boost in magnetism came from iron oxide particles in emissions that were trapped on the microscopically rough surface of the leaves, Housen reported October 18 at the annual meeting of the Geological Society of America.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.wired.com/wiredscience/2009/10/magnetic-leaf-pollution/">Iron oxide particles smaller than 2.5 micrometers across are typically magnetic, while those larger than 10 micrometers aren’t. Rain washes away no more than 30 percent of all the particles stuck on a leaf, and even ultrasonic vibrations can’t fully cleanse the surface. These characteristics make tree leaves a good candidate for pollution monitoring, </blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.wired.com/wiredscience/2009/10/magnetic-leaf-pollution/"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/www.wired.com/img/E4670F12-1AC2-4320-92FF-3C26BEDA002D" alt="magneticleaves1" /></div></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/3644E998-16F5-4C34-83BD-D25CF1459B25/blog/" title="blog or email this clip"><img src="http://content6.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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