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Keyword: microscopy

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  • Do Atoms Ever Touch? (video)

    08/05/2014 6:10:16 AM PDT · by servo1969 · 34 replies
    YouTube.com ^ | 8-5-2014 | Sixty Symbols
    Professor Philip Moriarty expresses his displeasure with oft-repeated belief that atoms do no physically touch each other.
  • Two techniques unite to provide molecular detail

    06/06/2013 6:51:44 PM PDT · by neverdem · 4 replies
    Nature News ^ | 05 June 2013 | Mark Peplow
    Raman spectroscopy souped up with scanning tunnelling microscopy hones in on individual atoms and bonds. Prepare to take flight across the surface of a molecule. An unprecedented window on the nanoscale world lets you feel the heft of the atoms beneath and test the strength of the chemical bonds that hold them together. This vision is now a reality, thanks to a system reported in this week's Nature1 that combines the best features of two imaging techniques: Raman spectroscopy and the scanning tunnelling microscope (STM). “It enables you to look at the guts of a molecule,” says Joanna Atkin, a...
  • Diagnosing bacterial growth

    02/07/2013 4:34:32 PM PST · by neverdem · 16 replies
    Chemistry World ^ | 6 February 2013 | Harriet Brewerton
    Antibiotics are used regularly for treating bacterial infections, but there is currently no quick and simple test to determine the most effective type or dose of antibiotic for a specific patient infection. As a result, it’s estimated that around 30% of all antibiotic prescriptions are not the optimum choice. This can lead to the formation of drug-resistant bacteria, delayed recovery, and in some cases death from an infection.Tests for the most appropriate antibiotic choice are performed for life-threatening patient infections. However, microbes have to be grown on agar plates from a very small patient sample which delays results for a...
  • Seeing cells under stress

    09/18/2012 7:42:06 AM PDT · by neverdem · 1 replies
    Chemistry World ^ | 17 September 2012 | Jennifer Newton
    The assembly includes a cell-stretching device, an atomic force microscopy head and an objective of the inverted microscopeAn analytical platform that imposes controlled mechanical strain onto live cells whilst monitoring changes in cell morphology and molecular signalling has been developed by scientists in Germany. Cellular processes induced by mechanical forces are crucial for bone healing and lung function. Understanding these processes could help to prevent and aid the development of therapies for mechanically induced lung and cardiovascular diseases and injuries.Christine Kranz and colleagues from the University of Ulm combined fluorescence microscopy with atomic force microscopy to analyse the cells. They...
  • New Approach of Resistant Tuberculosis (not exactly)

    08/10/2012 10:36:39 PM PDT · by neverdem · 9 replies
    ScienceDaily ^ | Aug. 10, 2012 | NA
    Scientists of the Antwerp Institute of Tropical Medicine have breathed new life into a forgotten technique and so succeeded in detecting resistant tuberculosis in circumstances where so far this was hardly feasible. Tuberculosis bacilli that have become resistant against our major antibiotics are a serious threat to world health. If we do not take efficient and fast action, 'multiresistant tuberculosis' may become a worldwide epidemic, wiping out all medical achievements of the last decades. A century ago tuberculosis was a lugubrious word, more terrifying than 'cancer' is today. And rightly so. Over the nineteenth and twentieth century it took a...
  • Researchers Invent New Tool to Study Single Biological Molecules

    08/05/2012 11:16:26 PM PDT · by neverdem · 1 replies
    ScienceDaily ^ | Aug. 3, 2012 | NA
    By blending optical and atomic force microscope technologies, Iowa State University and Ames Laboratory researchers have found a way to complete 3-D measurements of single biological molecules with unprecedented accuracy and precision. Existing technologies allow researchers to measure single molecules on the x and y axes of a 2-D plane. The new technology allows researchers to make height measurements (the z axis) down to the nanometer -- just a billionth of a meter -- without custom optics or special surfaces for the samples. "This is a completely new type of measurement that can be used to determine the z position...
  • Molecules Imaged Most Intimately

    08/24/2011 12:32:32 AM PDT · by neverdem · 12 replies
    ScienceNOW ^ | 23 August 2011 | Kim Krieger
    Enlarge Image Shadow of the orbitals. The pictures on the left show the highest occupied molecular orbital (top) and the lowest unoccupied molecular orbital (bottom) of pentacene, as mapped by the STM. The pictures on the right show the same orbital structures, calculated mathematically. Credit: Adapted from L. Gross et al., PRL, 107 (2011) If you took high school chemistry, then you undoubtedly recall the bizarre drawings of the "orbitals" that describe where in an atom or a molecule an electron is likely to be found. Resembling strange clouds with multiple lobes, the shapes and orientation of the orbitals...
  • New data zap views of static electricity - Charges build up due to exchange of material, study...

    06/25/2011 1:04:02 AM PDT · by neverdem · 23 replies
    Science News ^ | June 24th, 2011 | Devin Powell
    Charges build up due to exchange of material, study suggests A balloon rubbed against the head can be both a hair-raising and a hair-tearing experience, a new study suggests. Clumps of balloon and hair invisible to the naked eye may break off each object during contact and stick to the other. The existence of this exchange could challenge traditional theories about how static electricity builds up, a process known as contact electrification. “The basic assumptions people have made about contact electrification are wrong,” says Bartosz Grzybowski, a physical chemist at Northwestern University in Evanston, Ill. He and his colleagues describe...
  • Scientists use super microscope to pinpoint body’s immunity 'switch'

    06/05/2011 1:09:52 PM PDT · by decimon · 12 replies
    University of New South Wales ^ | June 5, 2011 | Unknown
    Molecular mechanism driving the immune response identified for the first timeUsing the only microscope of its kind in Australia, medical scientists have been able for the first time to see the inner workings of T-cells, the front-line troops that alert our immune system to go on the defensive against germs and other invaders in our bloodstream. The discovery overturns prevailing understanding, identifying the exact molecular 'switch' that spurs T-cells into action — a breakthrough that could lead to treatments for a range of conditions from auto-immune diseases to cancer. The findings, by researchers at the University of New South Wales...
  • Gauging High-Speed Spin Inside a Lilliputian World

    09/28/2010 10:51:41 PM PDT · by neverdem · 7 replies
    NY Times ^ | September 27, 2010 | JOHN MARKOFF
    SAN FRANCISCO — I.B.M. scientists have modified a scanning-tunneling microscope, making it possible to observe dynamic processes inside individual atoms on a time scale one million times faster than has previously been possible. The researchers have perfected a measurement technique in which they use an extremely short voltage pulse to excite an individual atom and then follow with a lower voltage to read the atom’s magnetic state, or spin, shortly afterward. The resulting data produces the equivalent of a high-resolution, high-speed movie of the atom’s behavior. The advance, reported Thursday in the journal Science, has potential applications in fields including...
  • Biologist Develop New Microscope So Powerful It Will See Individual Molecules

    01/06/2010 4:18:23 PM PST · by decimon · 4 replies · 423+ views
    Next Big Future ^ | Jan 6, 2009 | Brian Wang
    > They are developing a microscope incorporating two cutting-edge fluorescence techniques that give researchers the ability to observe and track individual protein molecules. UMass Amherst is the second university in the country to use one of these, called Stochastic Optical Reconstruction Microscopy (STORM). >
  • Far From a Lab? Turn a Cellphone Into a Microscope

    11/08/2009 7:19:51 PM PST · by neverdem · 27 replies · 1,110+ views
    NY Times ^ | November 7, 2009 | ANNE EISENBERG
    MICROSCOPES are invaluable tools to identify blood and other cells when screening for diseases like anemia, tuberculosis and malaria. But they are also bulky and expensive. An engineer at U.C.L.A. has adapted cellphones to do the work of microscopes in screening for diseases. Now an engineer, using software that he developed and about $10 worth of off-the-shelf hardware, has adapted cellphones to substitute for microscopes. “We convert cellphones into devices that diagnose diseases,” said Aydogan Ozcan, an assistant professor of electrical engineering and member of the California NanoSystems Institute at the University of California, Los Angeles, who created the devices....
  • Slideshow: Now you see it...

    06/06/2009 11:54:06 PM PDT · by neverdem · 13 replies · 882+ views
    Nature News ^ | June 2009 | NA
    There's a tour at the source from the history of microscopes to the present with nine images and captions.
  • Mimivirus up close - Scientists investigate structural details of the largest known virus

    04/30/2009 12:58:17 AM PDT · by neverdem · 11 replies · 1,350+ views
    Science News ^ | April 28th, 2009 | Rachel Ehrenberg
    Scientists have zoomed in on mimivirus, the enormous virus with the delicate name that has perplexed scientists since 1992, when it was found living in an amoeba in a water tower in England. “This is like landing on the moon,” says Michael Rossmann of Purdue University in West Lafayette, Ind. Rossmann and an international team of scientists report the results of their reconnaissance online April 27 in PLoS Biology. Mimivirus, full name Acanthamoeba polyphaga Mimivirus, is the largest known virus in the world. Its mass is more than 100 times that of the virus that causes the common cold, says...
  • Ultra-sensitive microscope reveals DNA processes

    11/16/2005 3:40:35 AM PST · by snarks_when_bored · 1,218 replies · 9,199+ views
    New Scientist ^ | November 15, 2005 | Gaia [sic] Vince
    Ultra-sensitive microscope reveals DNA processes     * 14:02 15 November 2005     * NewScientist.com news service     * Gaia Vince A new microscope sensitive enough to track the real-time motion of a single protein, right down to the scale of its individual atoms, has revealed how genes are copied from DNA – a process essential to life. The novel device allows users to achieve the highest-resolution measurements ever, equivalent to the diameter of a single hydrogen atom, says Steven Block, who designed it with colleagues at Stanford University in California. Block was able to use the microscope to track a molecule of DNA...