734 research outputs found
Storia verde del mondo
No full textA Green History addresses the influence of the environment on human history over the past 10,000 years, starting with the expansion of hunting and gathering groups, and the transition to settled agriculture. Ponting describes how exhaustion of the resources to which they had access doomed many human societies.
Ponting begins with the history of human settlement on Easter Island. This history serves as a cautionary example of the inability of a human society to stop destroying its natural resources even when it is obvious that continued resource destruction will doom future generations to life on a barren island with no possibility of escape. Our global society is now embarked on an incomparably massive resource extraction. Will we transcend the barriers that previous societies did not? Ponting does not propose solutions. He provides a wealth of illuminating and extremely sobering historical detail. (http://www.ecobooks.com/books/history.htm
Ponting, C K, 434348
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/411190Surname: PONTING. Given Name(s) or Initials: C K. Military Service Number or Last Known Location: 434348. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 57348.226903
Item: [2016.0049.43456] "Ponting, C K, 434348
Book review : Clive Ponting, Churchill
No full textBook review : Clive Ponting, Sinclair-Stevenson, London, 1994, 960pp. ISBN: 978-185619573
Film publicity press book: With Captain Scott in the Antarctic
No full textContains photographs of Scott's polar expedition taken by Herbert G. Ponting and Lieutenant Henry Robertson Bowers, as well as a story of the expedition and poems contributed by C. H. Meares
The late Captain Oates & Siberian ponies aboard the Terra Nova [picture] /
No full textTitle from caption bot. c.; Published (facing p. 12) of his: The great white south. London, 1921.; Exhibited: Shades of Light, ANG, 1988; Mirror with a Memory, NPG, 2000; P792/4; Reference prints available
DCD – a novel plant specific domain in proteins involved in development and programmed cell death
No full textBackground: Recognition of microbial pathogens by plants triggers the hypersensitive reaction, a common form of programmed cell death in plants. These dying cells generate signals that activate the plant immune system and alarm the neighboring cells as well as the whole plant to activate defense responses to limit the spread of the pathogen. The molecular mechanisms behind the hypersensitive reaction are largely unknown except for the recognition process of pathogens. We delineate the NRP-gene in soybean, which is specifically induced during this programmed cell death and contains a novel protein domain, which is commonly found in different plant proteins.
Results: The sequence analysis of the protein, encoded by the NRP-gene from soybean, led to the identification of a novel domain, which we named DCD, because it is found in plant proteins involved in d evelopment and c ell d eath. The domain is shared by several proteins in the Arabidopsis and the rice genomes, which otherwise show a different protein architecture. Biological studies indicate a role of these proteins in phytohormone response, embryo development and programmed cell by pathogens or ozone.
Conclusion: It is tempting to speculate, that the DCD domain mediates signaling in plant development and programmed cell death and could thus be used to identify interacting proteins to gain further molecular insights into these processes
(a)–(f) Frames of the time-lapse photographic sequence of the Lake Ponting drainage
No full text<p><strong>Figure 7.</strong> (a)–(f) Frames of the time-lapse photographic sequence of the Lake Ponting drainage. (g) Details of (f) showing the blocks in figure <a href="http://iopscience.iop.org/1748-9326/8/3/034007/article#erl468153fig6" target="_blank">6</a>(b) and the flow generated from the overspilling of a lake upstream Lake Ponting and responsible for the quick increase in lake depth before its drainage (see figure <a href="http://iopscience.iop.org/1748-9326/8/3/034007/article#erl468153fig2" target="_blank">2</a>).</p> <p><strong>Abstract</strong></p> <p>Supraglacial lake drainage on the Greenland ice sheet opens surface-to-bed connections, reduces basal friction, and temporarily increases ice flow velocities by up to an order of magnitude. Existing field-based observations of lake drainages and their impact on ice dynamics are limited, and focus on one specific draining mechanism. Here, we report and analyse global positioning system measurements of ice velocity and elevation made at five locations surrounding two lakes that drained by different mechanisms and produced different dynamic responses. For the lake that drained slowly (>24 h) by overtopping its basin, delivering water via a channel to a pre-existing moulin, speedup and uplift were less than half those associated with a lake that drained rapidly (~2 h) through hydrofracturing and the creation of new moulins in the lake bottom. Our results suggest that the mode and associated rate of lake drainage govern the impact on ice dynamics.</p
Conformational stability studies of the pleckstrin DEP domain: definition of the domain boundaries
No full textPleckstrin is the major substrate of protein kinase C in platelets. It contains at its N- and C-termini two pleckstrin homology (PH) domains which have been proposed to mediate protein-protein and protein-lipid interactions. A new module, called DEP, has recently been identified by sequence analysis in the central region of pleckstrin. In order to study this module, several recombinant polypeptides corresponding to the DEP module and N- and C-termini extended forms have been expressed. Using circular dichroism (CD) and nuclear magnetic resonance (NMR) techniques, the domain boundaries have been determined that yield a soluble and folded pleckstrin DEP domain. This comprises 93 amino acids with an alpha/beta fold in agreement with secondary structure predictions. Stability studies indicate that the regions surrounding the DEP domain do not contribute to its stability suggesting that the phosphorylation sites at S113, T114 and S117 are in an unstructured region. Identification of the regions of pleckstrin that are folded shall facilitate determination of its structure and function
Drainage features at the bottom of Lake Ponting a few hours after the drainage event
No full text<p><strong>Figure 8.</strong> Drainage features at the bottom of Lake Ponting a few hours after the drainage event. (a) Extensional fracture looking southeast towards the ice blocks. (b) Large ice blocks lying close to the fracture that had been plucked from it during lake drainage. (c) The largest of five moulins that lay on the fracture, looking southeast, with a diameter of ~10 m.</p> <p><strong>Abstract</strong></p> <p>Supraglacial lake drainage on the Greenland ice sheet opens surface-to-bed connections, reduces basal friction, and temporarily increases ice flow velocities by up to an order of magnitude. Existing field-based observations of lake drainages and their impact on ice dynamics are limited, and focus on one specific draining mechanism. Here, we report and analyse global positioning system measurements of ice velocity and elevation made at five locations surrounding two lakes that drained by different mechanisms and produced different dynamic responses. For the lake that drained slowly (>24 h) by overtopping its basin, delivering water via a channel to a pre-existing moulin, speedup and uplift were less than half those associated with a lake that drained rapidly (~2 h) through hydrofracturing and the creation of new moulins in the lake bottom. Our results suggest that the mode and associated rate of lake drainage govern the impact on ice dynamics.</p
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