Author: Neville

  • Harvesting light, the single-molecule way: Molecular mechanism of light harvesting may illuminate path forward to future solar cells

    Featured Research

    from universities, journals, and other organizations

    Harvesting light, the single-molecule way: Molecular mechanism of light harvesting may illuminate path forward to future solar cells

    Date:
    February 16, 2014
    Source:
    American Institute of Physics
    Summary:
    Scientists have reached new insights into one of the molecular mechanisms behind light harvesting, which enables photosynthetic organisms to thrive, even as weather conditions change from full sunlight to deep cloud cover. Probing these natural systems is helping us understand the basic mechanisms of light harvesting — work that could help improve the design and efficiency of devices like solar cells in the future.

    Light hitting photosynthetic antenna proteins is the first step in the light harvesting process, and studies of single copies of such proteins in solution has uncovered new photoprotective quenched states.
    Credit: G. Schlau-Cohen/Stanford

    New insights into one of the molecular mechanisms behind light harvesting, the process that enables photosynthetic organisms to thrive, even as weather conditions change from full sunlight to deep cloud cover, will be presented at the 58th Annual Biophysical Society Meeting, taking place in San Francisco from Feb. 15-19.

    At the meeting, Hsiang-Yu Yang, a graduate student, and Gabriela Schlau-Cohen, a postdoc in W.E. Moerner’s research group at Stanford University, will describe how probing these natural systems at the single molecule level is helping to understand the basic mechanisms of light harvesting — work that could help improve the design and efficiency of devices like solar cells in the future.

    “Through our approach, we are able to have a better understanding of the natural designs of light harvesting systems, especially how the same molecular machinery can perform efficient light harvesting at low light while safely dissipating excess excitation energy at high light,” explained Yang.

    The Moerner group has been studying various photosynthetic antenna proteins using the single-molecule Anti-Brownian ELectrokinetic (ABEL) trap and has uncovered new states of the light harvesting complexes with different degrees of quenching. “By analyzing the transition between these states in a bacterial antenna protein,” explained Schlau-Cohen, “we found a process that may be one of the molecular mechanisms of photoprotection, or the way in which the organism protects itself from damage by excess light.”

    The next steps are to use this technique to understand the natural designs of light harvesting systems, and investigate whether the same processes appear in higher plants. Thus, they are extending their studies to look at photosynthetic proteins from green plants. Eventually, understanding these general principles may help in developing or improving the building of artificial light-harvesting devices.


    Story Source:

    The above story is based on materials provided by American Institute of Physics. Note: Materials may be edited for content and length.


    Cite This Page:

    American Institute of Physics. “Harvesting light, the single-molecule way: Molecular mechanism of light harvesting may illuminate path forward to future solar cells.” ScienceDaily. ScienceDaily, 16 February 2014. <www.sciencedaily.com/releases/2014/02/140216151401.htm>.
  • Lake Macquarie council develops new guidelines to combat rising sea levels

    Tuesday February 18, 2014
    Larger / SmallerNight Mode

    Lake Macquarie council develops new guidelines to combat rising sea levels

    By GEORGIA OSLAND

    Feb. 17, 2014, 6:13 p.m.

    NEW development guidelines for homes in Lake Macquarie have been passed in a bid to combat rising sea levels.

    Lake Macquarie councillors voted unanimously for the Flood Resilient Housing Guidelines to be incorporated into the Lake Macquarie Control Plan 2013.

    The council has conducted various studies on sea level rise projections since 2008.

    The latest projections are 40 centimetres by 2050 and 90 centimetres by 2100.

    These studies highlighted the need to consider innovative, resilient housing designs.

    The new guidelines were formed to give Lake Macquarie residents options when building or renovating.

    Lake Macquarie mayor Jodie Harrison said there were a number of things for a home owner to consider, with options to build with flood-resilient materials, lift existing floor heights or relocate.

    “I think the new guidelines give landowners some great options and some points to think about where they want to live and how, now and in the future,” she said.

  • Shire says 1474 sites ‘at risk’ of flood

    Tuesday February 18, 2014
    Larger / SmallerNight Mode

    Shire says 1474 sites ‘at risk’ of flood

    By Jim Gainsford

    Feb. 18, 2014, 5:56 a.m.

    • Water views: The Georges River at Como.Water views: The Georges River at Como.

    A TOTAL of 1474 properties on the Georges River are identified as being potentially subject to flooding after factoring official projections for sea level rises from climate change.

    Under the Draft Lower Georges River Floodplain Risk Management Plan, the properties could be liable to carry planning certificate notations warning property owners, potential purchasers and developers of the flooding risks.

    In identifying the properties, Sutherland Shire Council was required by state legislation to consider climate change impacts including sea level rises.

    The council was due to adopt the plan last month but deferred the decision to ask for more information from the Office of Environment and Heritage.

    The plan identifies 1396 properties in Caringbah, Como, Cronulla, Kangaroo Point, Kareela, Kurnell, Oyster Bay, Sylvania, Sylvania Waters, Taren Point and Woolooware that will be affected by the projected sea level rise of 400 millimetres by 2050.

    It also identifies 78 properties in these suburbs that are potentially subject to flooding caused by a potential sea level rise of 900 millimetres by the year 2100.

    The plan was developed by a committee composed of council staff, councillors, state government representatives and members of the community.

    It was publicly exhibited and the council received 45 submissions.

    Concern was raised by some in the community that flood risk notations would lower property values.

    But a report by Macquarie University Natural Hazards Research Centre’s Stephen Yeo found that there was “no conclusive evidence that flood disclosure has an effect on property values”.

    The state government’s floodplain management manual requires all councils to introduce risk management plans.

    It was updated in 2005 to require councils to include advice relating to the potential impacts of climate change, including best estimates of sea level rises.

    Do you have concerns about flooding in parts of the shire? 

  • Muddying the Waters MONBIOT

    2 of 40
    Why this ad?
    Optus Cloud Solutionsoptus.com.au/CloudSolutions – Discover How Optus Can Keep Your Business Connected.

    Monbiot.com

    Inbox
    x

    George Monbiot news@monbiot.com via google.com

    6:37 PM (36 minutes ago)

    to me

    Monbiot.com


    Muddying the Waters

    Posted: 17 Feb 2014 12:29 PM PST

    How the government’s farming policies have produced a perfectly designed system for flooding your home.
    By George Monbiot, published in the Guardian 18th February 2014

    It has the force of a parable. Along the road from High Ham to Burrowbridge, which skirts Lake Paterson (formerly known as the Somerset Levels), you can see field after field of harvested maize. In some places the crop lines run straight down the hill and into the water. When it rains, the water and soil flash off into the lake. Seldom is cause and effect so visible.

    That’s what I saw on Tuesday. On Friday, I travelled to the source of the Thames. Within 300 metres of the stone that marked it were ploughed fields, overhanging the catchment, left bare through the winter and compacted by heavy machinery. Muddy water sluiced down the roads. A few score miles downstream it will reappear in people’s living rooms. You can see the same thing happening across the Thames watershed: 184 miles of idiocy, perfectly calibrated to cause disaster.

    Two realities, perennially denied or ignored by members of this government, now seep under their doors. In September the environment secretary, Owen Paterson, assured us that climate change “is something we can adapt to over time and we are very good as a race at adapting.”(1) If two months of severe weather almost sends the country into meltdown, who knows what four degrees of global warming will do?

    The second issue, once it trickles into national consciousness, is just as politically potent: the government’s bonfire of regulations. Almost as soon as it took office, it appointed a task force to investigate farming rules(2). Its chairman was the former director-general of the National Farmers’ Union. Who could have guessed that he would recommend, er, “an entirely new approach to and culture of regulation … Government must trust industry.”(3) The task force’s demands, embraced by Mr Paterson, now look as stupid as Gordon Brown’s speech to an audience of bankers in 2004: “in budget after budget I want us to do even more to encourage the risk takers”(4).

    Six weeks before the floods arrived, a scientific journal called Soil Use and Management published a paper warning that disaster was brewing(5). Surface water run-off in south-western England, where the Somerset Levels are situated, was reaching a critical point. Thanks to a wholesale change in the way the land is cultivated, at 38% of the sites the researchers investigated, the water – instead of percolating into the ground – is now pouring off the fields.

    Farmers have been ploughing land that was previously untilled and switching from spring to winter sowing, leaving the soil bare during the rainy season. Worst of all is the shift towards growing maize, whose cultivated area in this country has risen from 1,400 hectares to 160,000 since 1970(6). In three quarters of the maize fields in the south west, the soil structure has broken down to the extent that they now contribute to flooding. In many of these fields, soil, fertilisers and pesticides are sloshing away with the water. And nothing of substance, the paper warned, is being done to stop it(7). Dated: December 2013.

    Maize is being grown in Britain not to feed people, but to feed livestock and, increasingly, the biofuel business(8). This false solution to climate change will make the impacts of climate change much worse, by reducing the land’s capacity to hold water.

    The previous government also saw it coming. In 2005 it published a devastating catalogue of the impacts of these changes in land use(9). As well as the loss of fertility from the land and the poisoning of watercourses, it warned, “increased run-off and sediment deposition can also increase flood hazard in rivers.” Maize, it warned, is a particular problem because the soil stays bare before and after the crop is harvested, without the stubble or weeds required to bind it. “Wherever possible,” it urged, “avoid growing forage maize on high and very high erosion risk areas.”

    The Labour government turned this advice into conditions attached to farm subsidies(10). Ground cover crops should be sown under the maize and the land should be ploughed, then resown with winter cover plants within ten days of harvesting, to prevent water from sheeting off. So why isn’t this happening in Somerset?

    Because the current government dropped the conditions. Sorry, not just dropped them. It issued – wait for it – a specific exemption for maize cultivation from all soil conservation measures(11). It’s hard to get your head round this. The crop which causes most floods and does most damage to soils is the only one which is completely unregulated.

    When soil enters a river we call it silt. A few hundred metres from where the soil is running down the hills, a banner over the River Parrett shouts “Stop the Flooding, dredge the rivers”. Angry locals assail ministers and officials with this demand. While in almost all circumstances, dredging causes more problems than it solves(12), and though, as even Owen Paterson admits, “increased dredging of rivers on the Somerset Levels would not have prevented the recent widespread flooding”(13), there’s an argument here for a small amount of dredging at strategic points. But to do it while the soil is washing off the fields is like trying to empty the bath while the taps are running.

    So why did government policy change? I’ve tried asking the environment department: they’re as much use as a paper sandbag(14). But I’ve found a clue. The Farm Regulation Task Force demanded a specific change: all soil protection rules attached to farm subsidies should become voluntary(15). They should be downgraded from a legal condition to an “advisory feature”. Even if farmers do nothing to protect their soil, they should still be eligible for public money.

    You might have entertained the naïve belief that in handing out billions to wealthy landowners we would get something in return. Something other than endless whining from the National Farmers’ Union(16). But so successfully has policy been captured in this country that Defra – which used to stand for the Department for Environment, Food and Rural Affairs – now means Doing Everything Farmers’ Representatives Ask. We pay £3.6bn a year for the privilege of having our wildlife exterminated, our hills grazed bare, our rivers polluted and our sitting rooms flooded.

    Yes, it’s a parable all right, a parable of human folly, of the kind that used to end with 300 cubits of gopher wood and a journey to the mountains of Ararat. Antediluvian? You bet it is.

    www.monbiot.com

    References:

    1. http://www.theguardian.com/environment/2013/sep/30/owen-paterson-minister-climate-change-advantages

    2. https://www.gov.uk/government/publications/independent-farming-regulation-task-force-report

    3. Farming Regulation Task Force Striking a balance: reducingburdens; increasing responsibility; earning recognition. Summary of Recommendations. May 2011. https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/69202/pb13528-farm-reg-task-summary1.pdf

    4. http://www.gov-news.org/gov/uk/news/speech_given_by_chancellor_exchequer_gordon/76291.html

    5. R. C. Palmer and R. P. Smith, December 2013. Soil structural degradation in SW England and its impact on surface-water runoff generation. Soil Use and Management, 29, 567–575 doi: 10.1111/sum.12068

    6. http://anewnatureblog.wordpress.com/2014/02/06/lost-in-the-drainage-maize/

    7. R. C. Palmer and R. P. Smith, December 2013. Soil structural degradation in SW England and its impact on surface-water runoff generation. Soil Use and Management, 29, 567–575 doi: 10.1111/sum.12068

    8. http://www.theguardian.com/commentisfree/2007/mar/27/comment.food

    9. Defra, September 2005. Controlling soil erosion: a manual for the assessment and management of agricultural land at risk of water erosion in lowland England. http://archive.defra.gov.uk/environment/quality/land/soil/documents/soilerosion-lowlandmanual.pdf

    10. Defra, 2009. Single Payment Scheme Cross Compliance Guidance for Soil Management: 2010 edition.

    http://rpa.defra.gov.uk/rpa/index.nsf/0/2ba694d4a8a991478025768e005e67c0/$FILE/Cross%20Compliance%20Guide%20to%20Soil%20Management%202010%20edition.pdf

    11. Defra and Rural Payments Agency, December 2013. The Guide to Cross Compliance
    in England 2014: complete edition. See Page 18. http://rpa.defra.gov.uk/rpa/index.nsf/0/6eb355ea8482ea61802573b1003d2469/$FILE/The%20Guide%20to%20Cross%20Compliance%20in%20England%202014%20complete%20edition.pdf

    12. http://www.bidfordonavon-pc.gov.uk/pdfs/notices/dredgingpres.pdf

    13. http://www.bbc.co.uk/news/uk-25908098

    14. I found the exchange very telling. Defra ignored the email I sent on Friday. I rang first thing on Monday morning and was promised an answer. Then again. Then again. Finally, after my deadline had passed, they sent me the following: “Under cross compliance rules farmers are required to put measures in place to prevent soil erosion and run off for all cropping regimes. Specific measures for each crop must be included in their Farm Soil Plan, including where the post-harvest management derogation is applied.” You’ll note that there is no mention of maize, or the exemption. Or any attempt at an explanation. This, dear reader, is what you are paying for.

    15. Farming Regulation Task Force Striking a balance: reducingburdens; increasing responsibility; earning recognition. Summary of Recommendations. May 2011. https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/69202/pb13528-farm-reg-task-summary1.pdf

    16. http://www.theguardian.com/environment/georgemonbiot/2013/jul/08/national-farmers-union-public

  • [New post] WA Senate: Court on the verge of calling new election

    1 of 38
    Why this ad?
    $8k+ Debt Consolidationfoxsymes.com.au/Debt-Consolidation – Forget Loans & High Interest Rates. There Are Better Ways To Solve Debt

    [New post] WA Senate: Court on the verge of calling new election

    Inbox
    x

    The Tally Room donotreply@wordpress.com

    5:54 PM (8 minutes ago)

    to me

    New post on The Tally Room

    WA Senate: Court on the verge of calling new election

    by Ben Raue

    High Court Justice Kenneth Hayne, sitting as the Court of Disputed Returns, brought out the first part of his judgement in the case of the Western Australian Senate election from 2013.

    His findings included that:

    • The 1370 voters whose votes were lost were effectively “prevented from voting”,
    • That it was not possible to combine the results from the original count for the 1370 missing votes with the results from the recount for the rest of the state,
    • That Scott Ludlam and Wayne Dropulich (who won the final two seats in the recount) were not duly elected, and it was not possible to determine who was duly elected, and
    • That the “only relief appropriate is for the election to be declared void”.

    Justice Hayne has not issued a ruling ordering that the election is to be declared void, but all commentators seem to agree that the judgements he has made today leave only the option of a fresh Senate election.

    The Court will issue further rulings on Thursday 20 February, when Justice Hayne is expected to rule on whether a fresh election is called.

    If the election is voided this week, the earliest possible date for an election will be March 29. Other possible dates will be in April and May. An election will need to be held by May to ensure the result is concluded prior to the new Senate taking office on July 1.

    The choice of election date will be effected by two weeks of school holidays in April, which includes the Easter and Anzac Day long weekends.

    The Governor of Western Australia will need to issue the writs for the upcoming election. Due to a lack of a precedent, it is unclear who will give advice regarding an election date. In the case of by-elections in the House of Representatives, the writs are issued by the Speaker, rather than by the Governor-General, and the Speaker’s membership of the governing party usually gives that power influence over the selection of the date.

    In Senate elections, the date is determined by the Prime Minister advising the Governor-General, and then the state Governors issuing writs. It is unclear whether Prime Minister Abbott or Premier Barnett would be in a position to give advice to the Governor as to the date of the election.

    Current polling suggests that the Liberal Party may struggle to again elect three Senators at a new election in WA. The quarterly state breakdown of Newspoll’s federal polling for the last quarter of 2013 saw the Liberal Party two-party-preferred vote in Western Australia drop to 50%, down from over 58% at the federal election.

    If the primary votes in the poll were reflected in the Senate result, the ALP and the Greens would be able to elect three candidates between them, with the Liberal Party competing with minor parties for the final seat.

    Both possible outcomes of the September election saw the ALP and Greens lose one seat between them: such a new result would mean that neither party of the left would lose a seat in WA, with both Scott Ludlam and Louise Pratt holding on.

    In contrast, the third Liberal senator-elect, Linda Reynolds, was comfortably elected in September but would be in serious danger of losing at a by-election.

    It will be a fascinating race to watch.

     
  • Are heatwaves the new normal?

    1 of 37
    Why this ad?
    Reduce Debt in Minutesfoxsymes.com.au/Debt-Consolidation – As seen on ACA & Today Tonight. Aussie Debt Consolidation Experts.

    Are heatwaves the new normal?

    Inbox
    x

    Tim Flannery – Climate Council via sendgrid.info

    3:27 PM (14 minutes ago)

    to me
    Hi Inga

    Many people are wondering if the intense heatwaves we’ve had this summer are normal, or if we’re seeing the impacts of climate change.

    Our latest report, released today, finds that climate change is already making heatwaves worse. Heatwaves are hotter, longer, more frequent and occurring earlier.

    In fact, hot weather in Adelaide, Melbourne and Canberra has already reached levels predicted for 2030. These are just a few of the extraordinary findings of our latest report Heatwaves: Hotter, Longer, More Often, which has been heavily covered by the media today.

    See the rest of the extraordinary findings here.

    I want the scientific findings outlined in the report to be used to ensure Australians have the best information available to prepare for what is ahead and to take action.

    So my colleagues and I have been busy getting the word out to ordinary Australians in the media today. You can see some of the coverage so far on Sunrise, News.com.au, The Herald Sun, The Courier Mail, The Conversation and The Age, plus look out for us on Channel 10 & Sky News this evening and Wake Up tomorrow morning.

    Help us to get this important information out by sharing the report’s findings with your networks.

    Limiting further increase in heatwaves requires urgent and significant reduction in the emission of greenhouse gases. This is the critical decade if we want to prevent heatwaves getting even worse.

    Thanks for helping us to change the conversation and make sure it is based on best science available.

    Tim Flannery
    Chief Councillor

    P.S The Climate Council is independent and community funded, it’s your support that makes this work possible. A huge thank you to all of our Founding Friends. You can become a Founding Friend at: http://secure.climatecouncil.org.au/.