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Leigh, D.F.,Owen, J.H.G.,Lee, S.M.,Porfyrakis, K.,Ardavan, A.,Dennis, T.J.S.,Pettifor, D.G.,Briggs, G.A.D. Elsevier 2005 Chemical physics letters Vol.414 No.4
<P><B>Abstract</B></P><P>Two different structural isomers of Nd@C<SUB>82</SUB> have been isolated using two-stage high-performance liquid chromatography. Their molecular orbital structures have been studied by a combination of scanning tunneling microscopy (STM) and density functional theory (DFT). Matching filled and empty-states STM images to DFT calculations allowed us to distinguish directly between the two isomers on the surface.</P>
Energy Value of Carbohydrate and Lipids with Added Calcium for Growing Mice
Khalil, Dania A.,Owens, Fredric N.,Hanson, Christa F. The Korean Society of Food Science and Nutrition 2000 Preventive Nutrition and Food Science Vol.5 No.2
The caloric contribution of diets supplemented with sucrose, corn oil, or tallow with or without additional calcium was examined using female CD1 weanling mice. Mice were limit-fed a semi-purified diet alone or with added isocaloric amounts from sucrose, corn oil, or tallow for 28 days. In addition, diets with suppelmental fat contained either 0.60% or 1.5% calcium. Fecal fat and fecal soap excretions were greater (p<0.06) for mice fed tallow than for those fed corn oil. Mean metabolizable energy values for sucrose, tallow, and corn oil averaged 4.01, 7.96, and 8.94 kcal, respectively. Retention of digested energy from sucrose, tallow and corn oil averaged 13%, 10% and 21%, respectively. Hence, per gram of added nutrient, retained energy from tallow averaged 1.60 and that from corn oil averaged 4.11 times that of added sucrose. Retained energy from added corn oil was greater (p<0.01) than from added tallow. On a retained energy basis, the relative value for corn oil was greater and the relative value for tallow was less than the metabolizable energy ratio of fat to carbohydrate proposed by Atwater of 2.25.Added calcium depressed(p<0.01) digestibilities of both dry matter and energy with a greater(p<0.01) effect on tallow than on corn oil. These findings imply that the source of fat and calcium in the diet influence the avail-ability energy in diets and should be considered in feed formulations.
Seong, Y.B.,Owen, L.A.,Caffee, M.W.,Kamp, U.,Bishop, M.P.,Bush, A.,Copland, L.,Shroder, J.F. Elsevier 2009 Geomorphology Vol.107 No.3
Basin-wide rockwall retreat rates are estimated using cosmogenic <SUP>10</SUP>Be concentrations in supraglacial debris from the Baltoro Glacier basin in K2 region of the Central Karakoram, Pakistan. Total cosmogenic <SUP>10</SUP>Be concentrations of the supraglacial debris were measured using accelerator mass spectrometry to determine <SUP>10</SUP>Be concentrations inherited from the rockwalls within the glaciated basin. Given that rockfall induced by periglacial weathering and snow and ice avalanches is the most important source of supraglacial debris production in the high mountain glaciated basin, the erosion rate of the bare bedrock can be considered to be the rate of rockwall retreat. The rate of the rockwall erosion, converted from the calculated inheritance of <SUP>10</SUP>Be concentrations, using the maximum velocity of the active glacier, places an upper limit ranging from 0.65 mm/year to 2.48 mm/year. This rate of rockwall retreat is in the same order of magnitude reported in other high Himalayan mountains. The rate, however, is an order of magnitude higher than erosion rates inferred from sediment budget studies and half that of the fluvial incision rate and exhumation rate for the same region. The difference between rates of basin-wide rockwall retreat and fluvial incision rates over the Late Quaternary suggests that in this glaciated basin fluvial incision is likely enhanced by localized/differential tectonism and/or isostatic uplift.