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jueves, 28 de abril de 2011

The E-learning Daily



 compartido por 53 personas de la lista de Ian Huckabee en Twitter
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schoolsEDU
by Loreal Lynch | April 25, 2011 While academia has long been criticized for its failure to embrace modern technology, professors today are proving to be quite tech-savvy. In fact, a recent study b...
 schools.com
Educación

InspirationSW
April 28, 2011 Visual Learning Webinar: Develop Student Thinking Skills with VariQuest and Inspiration   Time:              12 p.m. ET/11 a.m. CST/9 a.m. PT       Register Here > 4 p.m. ET/3 p.m. C...
 variquest.com
Educación

Social_LMS
Interactyx Limited provides social eLearning software and solutions that enhances learning management system (LMS) functionality with integrated social learning tools. Copyright © 2008-2011 Interac...
 interactyx.com
Negocios

TLBissette
by Tracy Bissette and Ian Huckabee on April 28, 2011 While the performance benefits of corporate training are well understood by most companies, economic conditions have forced many to look for qui...
 weejeelearning...
Educación

josiefraser
Home » Funding » Grant 4/11 - Call for projects in developing digital literacies JISC invites institutions to submit funding proposals for projects to support the development and implementation of ...
 jisc.ac.uk
Educación

weknowmore
Vele nonprofit organisaties, zoals scholen, overhead en gezondheidszorg, als profit organisaties zetten hun eerste stappen op nieuwe media. En terecht! Sociale media bieden enorme nieuwe kansen om ...
 socialemediatr...
Tecnología

josiefraser
Whoa, what's happening? Sorry if we've caught you by surprise. Delicious has been acquired by the founders of YouTube, Chad Hurley and Steve Chen and will become part of their new Internet company,...
 delicious.com
Tecnología

GoodtoKNO
    Study finds growing acceptance, but preference for print textbook continues   OBERLIN, Ohio, April 19, 2011 /PRNewswire-USNewswire/ -- This past holiday season, e-readers were found under many ...
 prnewswire.com
Negocios

GoodtoKNO
The future is here. If you’re looking for ways to cut costs as either a student or teacher, why not consider digital textbooks? There’s cheaper, easier to use, and a lot easier on the back. I remem...
 edudemic.com
Educación

geetabose
« The Power of the Short Story |Main Why would one of the world's foremost business storytelling experts say he was going to use storytelling to convey his message and then not tell a story? Readin...
 anecdote.com.au
Educación

geetabose
Example One In pizza retailing, innovation is a key factor in bringing in customers. But beyond introducing new toppings and playing with the base, what potential for innovation is there? To solve ...
 thestorytest.com
Gente

marciamarcia
I spent some time this weekend reading “The New Social Learning: A Guide to Transforming Organizations Through Social Learning” by Tony Bingham and Marcia Conner. Their book is a great look on how ...
 mrbernia.wordp...
Educación

UpsideLearning
From my first space themed set at age six, into the Technic range in my teens and twenties, I continue to indulge my fascination for Lego brick sets. I’m what is termed an AFOL – Adult Fan of Lego;...
 upsidelearning...
Educación

edReformer
by Tom Vander ArkApril 27, 2011 Yesterday, Pearson announced that it bought SchoolNet, a leading provider of student achievement data systems. —- NEW YORK–(BUSINESS WIRE)–The Pearson Foundation tod...
 edreformer.com
Educación

edReformer
ST. PAUL — With the dust settling on legislative sessions around the country, 2011 is shaping up as one of the most consequential years in memory for changes in the way schools are run. ...
 nytimes.com

ToddAHoffman
By Jim LodicoPublished April 28, 2011 Ever wonder why you can have 548 friends on Facebook, yet only 15-20 show up in your news feed? It’s not that those other friends have stopped using Facebook; ...
 socialmediaexa...

Mary_Hutchison
Hi View all users Use a ready-made Thinking Guide Start a New Thinking Guide Thinking Guides are tools or frameworks for thinking through an issue and considering different aspects or perspectives....
 exploratree.or...
Cultura y Espectáculos

ToddAHoffman
Back in the 1970's I taught a high school social studies course called "War and Peace Studies."  A recent email exchange reminded me of a simplified version of the Prisoner's Dilemma that I created...
 peterpappas.bl...
Educación

dansta
This past week our gaming department at Web Courseworks has posted a new blog entry on Games Can Teach, about an intriguing experimental game that the University of Michigan Institute of Museum and...
 webcourseworks...
Educación

SFERnational
Today’s Must-Read: “Foundations Join to Offer Online Courses for Schools” The Gates Foundation and Pearson are teaming up to produce online math and reading courses that will be tied to common core...
 studentsforedr...
Educación
Publicado por Bibliomanazteca en 10:00 0 comentarios
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A New Victim of Second-Hand Smoking: Fish


A New Victim of Second-Hand Smoking: Fish

Posted by JEFFREY KLUGER Wednesday, April 27, 2011 at 4:05 pm
1 Comment • Related Topics: environmentalism, oceans, waste, water, wildlife , , , , , , , 
 
For smokers, the world has always been one big ashtray, with cigarettes flicked away pretty much anywhere. That's especially true now, since smokers are increasingly forbidden to light up in restaurants, office buildings and even new no-smoking condos. In the great river of litter human beings create each year, so tiny a thing as a cigarette butt hardly seems to amount to much. But with the world's smokers burning through a breathtaking  5.6 trillion cigarettes per year — 4.5 trillion of which are simply tossed away outside after they're smoked —  little things add up fast. That, as it turns out, can be especially dangerous for one type of nonhuman critter: fish.
About a third of all of the trash found on U.S. shorelines consists of cigarette butts. There's no such thing as good litter, but butts may be among the worst, since they're impregnated with concentrated quantities of the 4,000 chemicals — many of them highly toxic — that occur naturally in tobacco and are added in the cigarette-manufacturing process. In a newpaper published in the journal Tobacco Control, a team of researchers headed by Eli Slaughter of San Diego State University's Graduate School of Public Health sought to determine the kind of harm those poisons can do.
Slaughter and his team broke cigarette waste down into three categories: smoked filters with some scraps of tobacco left; smoked filters with all of the tobacco burned or washed away; and unsmoked filters, which themselves contain a whole stew of chemicals. They immersed samples of each type of butt in separate 2-liter (.5 gal) containers of water and allowed them to soak. In some of the vessels, 16 butts were added to the water, in some 8, in some 4, 2, 1 or just a half a butt. After 24 hours, the butts were removed and  fish were added.
The two types of fish the researchers chose for their study were the topsmelt and fathead minnow, both common in U.S. waterways. All of the fish were 14 days old or younger. What Slaughter and his team were looking for was what's known as the LC50 — the lethal concentration of cigarette butt leachate in water that would kill 50% of the sample.
Of the three types of cigarette butts used, they found, it was the filter with traces of tobacco still clinging to it that was the deadliest, with an LC50 of just one butt per liter. Smoked filters with no tobacco had an LC50 of 4.3. Unsmoked filters with no tobacco attached were not far behind, at 5.1. That figure surprised the researchers — but only a little. Even the most pristine cigarette filter is still made of 15,000 cellulose acetate fibers surrounded by paper or rayon and treated with glues, salts and other chemicals to hold it all together and help the cigarette burn evenly. Could any of that be good for you? There's no telling what the deadliest chemicals in the smoked butts were, but high on the list have to be pesticides (sprayed on tobacco crops), acetone, formaldehyde, benzene, hydrogen cyanide and argon.
There are obvious flaws in the study,not the least being that toxins from cigarettes dropped in or near the ocean get diluted a whole lot more than those dropped in a tiny 2-liter vessel. What's more, topsmelt and fathead minnows are hardly the only kinds of fish in the sea, and plenty of others may be affected by butt toxins differently. But Slaughter and his team did not intend their study to replicate what actually goes on in the real world; rather they simply wanted to establish toxicity thresholds that can be used as a baseline for further research. They acknowledge a 2002 study by the Royal Australian Society Chemical Institute concluding that littered cigarette butts pose a "low to moderate risk to aquatic organisms." Low to moderate risk, however, is still not good and that doesn't account for the "bioaccumulation" factor — the way long-term exposure to cigarette residue can cause toxins to collect in individual fish, and the way those poisons can get concentrated as big fish eat little fish and the chemicals move up the food chain.
The simplest fix, of course, would be for smokers to stop tossing their butts wherever they jolly well please. The better answer for any organism smart enough to dream up the idea of cigarettes in the first place is to quit smoking the things altogether and give everybody — on the land and in the seas — a break.


Read more: http://ecocentric.blogs.time.com/2011/04/27/a-new-victim-of-second-hand-smoking-fish/#ixzz1KnTf4HA0
Publicado por Bibliomanazteca en 1:34 0 comentarios
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