54 research outputs found
High temperature magnetic ordering in La2RuO5
Magnetic susceptibility, heat capacity and electrical resistivity
measurements have been carried out on a new ruthenate, La2RuO5 (monoclinic,
space group P21/c) which reveal that this compound is a magnetic semiconductor
with a high magnetic ordering temperature of 170K. The entropy associated with
the magnetic transition is 8.3 J/mole-K -close to that expected for the low
spin (S=1) state of Ru4+ ions. The low temperatures specific heat coefficient g
is found to be nearly zero consistent with the semiconducting nature of the
compound. The magnetic ordering temperature of La2RuO5 is comparable to the
highest known Curie temperature of another ruthenate, namely, metallic SrRuO3,
and in both these compounds the nominal charge state of Ru is 4+.Comment: 16 pages, 6 figures, To be published in Solid State Communication
Magnetocaloric effect in R2Ti3Ge4 (R = Gd, Tb and Er) Compounds
Heat capacity of polycrystalline R2Ti3Ge4 (R = Gd, Tb and Er) compounds
(Orthorhombic, Sm5Ge4-type, Space group Pnma) has been studied in the
temperature range of 1.8 K to 300 K in various applied magnetic fields. The
compounds with magnetic lanthanide elements show interesting low field
magnetism intrigued by possible presence of competing antiferromagnetic and
ferromagnetic interactions. The magnetocaloric effect in these compounds is
estimated from the field dependent heat capacity data. The magnetic entropy
change and the adiabatic temperature change in the vicinity of the magnetic
transition are found to be significant.Comment: 12 pages incl 3 figures, submitted to Journal of Applied Physic
Magnetoelectricity at room temperature in Bi0.9-xTbxLa0.1FeO3 system
Magnetoelectric compounds with the general formula, Bi0.9-xRxLa0.1FeO3 (R
=Gd, Tb, Dy, etc.), have been synthesized. These show the coexistence of
ferroelectricity and magnetism, possess high dielectric constant and exhibit
magnetoelectric coupling at room temperature. Such materials may be of great
significance in basic as well as applied research.Comment: 11 pages of text and figure
Structural and Magnetic Properties of MrSrâYâ.â Ceâ.â CuâOz (M-1222) Compounds with M = Fe and Co
The MSr2Y1.5Ce0.5Cu2Oz (M-1222) compounds, with M = Fe and Co, have been synthesized through a solid-state reaction route. Both compounds crystallize in a tetragonal structure (space group 14/mmm). A Rietveld structural refinement of the room-temperature neutron diffraction data for Fe-1222 reveals that nearly half the Fe remains at the M site, while the other half goes to the Cu site in the CuO2 planes. Existence of Fe at two different lattice sites is also confirmed by 57Fe Mössbauer spectroscopy from which it is inferred that ~50% of the total Fe occupies the Cu site in the CuO2 planes as Fe3+, whereas the other ~50% is located at the M site with ~40% as Fe4+ and ~10% as Fe3+. For the M[Double Bond]Co compound, nearly 84% of Co remains at its designated M site, while the rest occupies the Cu site in the CuO2 planes
Magnetic and transport properties of Mo substituted La0.67Ba0.33Mn1-xMoxO3 perovskite system
The effect of doping Mo for Mn on the magnetic and transport properties of
the colossal magnetoresistance material, La0.67Ba0.33MnO3, has been studied.
Compounds of the series La0.67Ba0.33Mn1-xMoxO3 (x=0.0 to 0.1) have been
prepared and found to crystallize in the orthorhombic structure (space group
Pbnm). Energy Dispersive X-ray Analysis (EDAX) measurements confirm the
stoichiometry of all the samples. Magnetotransport and magnetization
measurements reveal that the metal-insulator transition temperature (Tp)
decreases from 330K for x=0 to 255K for x=0.1. The change in Tp on Mo
substitution is relatively much smaller than the corresponding change observed
on substitution by other transition elements, such as Ti, Fe, Co, Ni, etc.
Further, the ferromagnetic transition temperature (TC) is nearly unchanged by
Mo substitution. This is in striking contrast to the large decrease in TC
observed with substitution of above-mentioned 3d elements. These unusual
magnetic and transport properties of La0.67Ba0.33Mn1-xMoxO3 may be either due
to the formation of magnetic pair between Mn and Mo or due to strong
Mo(4d)-O(2p) overlap, which in turn, may affect the Mn-Mn interaction via the
oxygen atomsComment: 25 pages, 5 figure
Herpes simplex virus ICP27 protein directly interacts with the nuclear pore complex through NUP62, inhibiting host nucleocytoplasmic transport pathways
The herpes simplex virus ICP27 protein is important for the expression and nuclear export of viral mRNAs. Although several binding sites have been mapped along the ICP27 sequence for various RNA and protein partners including the transport receptor TAP of the host cell nuclear transport
machinery, several aspects of ICP27 trafficking through the nuclear pore complex remain unclear. We investigated if ICP27 could interact directly with the nuclear pore complex itself, finding that ICP27 directly binds the core nucleoporin Nup62. This is confirmed through co-immunoprecipitation and in vitro binding assays with purified components. Mapping with ICP27 deletion and point mutants further shows that the interaction requires sequences in both the N and C-termini of ICP27. Expression of wildtype ICP27 protein inhibited both classical,
importin α/ÎČ-dependent and transportin dependent nuclear import. In contrast, an ICP27 point mutant that does not interact with Nup62 had no such inhibitory effect. We suggest that ICP27 association with Nup62 provides additional binding sites at the nuclear pore for ICP27 shuttling thus supporting ICP27-mediated transport. We
propose that ICP27 competes with some host cell transport receptors for binding, resulting in inhibition of those host transport pathways
Structural and magnetic properties of MSr2Y1.5Ce0.5Cu2Oz (M-1222) compounds with M = Fe and Co
MSr2Y1.5Ce0.5Cu2Oz (M-1222) compounds, with M = Fe and Co, have been
synthesized through a solid-state reaction route. Both compounds crystallize in
a tetragonal structure (space group I4/mmm). A Rietveld structural refinement
of room-temperature neutron diffraction data for Fe-1222 reveals that nearly
half the Fe remains at the M site, while the other half goes to the Cu site in
the CuO2 planes. Existence of Fe at two different lattice sites, is also
confirmed by 57Fe Mossbauer spectroscopy from which it is inferred that nearly
50% of the total Fe occupies the Cu site in the CuO2 planes as Fe3+, whereas
the other 50 % is located at the M site with nearly 40 % as Fe4+ and around 10%
as Fe3+. For the M = Co compound, nearly 84 % of Co remains at its designated M
site, while the rest occupies the Cu site in the CuO2 planes. The oxygen
content, z, based on oxygen occupancies refined from the neutron diffraction
data, comes close to 9.0 for both the samples The ZFC and FC magnetization
curves as a function of temperature show a complex behavior for both Fe-1222
and Co-1222 compounds.Comment: MMM Inter mag Proceedings, accepted in J. Appl. Phy
Crop Updates 2008 - Cereals
This session covers twenty four papers from different authors:
WHEAT AGRONOMY
1. Wheat variety performance in the Northern Agricultural Region in 2007, Christine Zaicou, Department of Agriculture and Food
2. Wheat variety performance on the Central Agricultural Region in 2007, Shahajahan Miyan, Department of Agriculture and Food
3. Response of wheat varieties to sowing time in the Great Southern and Lakes Region in 2007, Brenda Shackley and Steve Penny, Department of Agriculture and Food
4. Wheat variety performance in the South Coastal Region in 2007, Sarah Ellis, Department of Agriculture and Food
5. Flowering dates of wheat varieties in Western Australia in 2007, Darshan Sharma, Brenda Shackley and Christine Zaicou, Department of Agriculture and Food
BARLEY AGRONOMY
6. Barley variety options for Western Australia, Blakely Paynter, Andrea Hills and Jeff Russell, Department of Agriculture and Food
7. Vlaming A â the newest malting barley variety, Blakely Paynter, Jeff Russell and Andrea Hills, Department of Agriculture and Food
8. Barley yields higher in wide rows with stubble retained in a very dry season at Merredin, Glen Riethmuller, Bill Bowden and Paul Blackwell, Department of Agriculture and Food
HERBICIDE TOLERANCE
9. Herbicide tolerance of current/new wheat varieties, Dr Harmohinder Dhammu, Department of Agriculture and Food
10. Herbicide tolerance of new oat varieties, Dr Harmohinder Dhammu, Vince Lambert, and Chris Roberts,Department of Agriculture and Food
NUTRITION
11. Managing nitrogen inputs in malting barley, Andrea Hills and Blakely Paynter, Department of Agriculture and Food
12. Decision tools for optimal N on cereal crops, David and Sally Cox, Jeremy Lemon* and Andrea Hills*, *Department of Agriculture and Food
13. Wheat varieties respond differently to potassium application on potassium responsive soils, Paul Damon and Zed Rengel, Faculty of Natural and Agricultural Sciences, University of Western Australia
DISEASES
14. Leaf disease management in continuous barley in the northern and central grainbelt of WA, Geoff Thomas, Ciara Beard, Anne Smith, Kith Jayasena and Sean Kelly, Department of Agriculture and Food
15. Temperature and moisture requirements of leaf, stem and stripe rusts of wheat, Geoff Thomas, Rob Loughman and Bill MacLeod, Department of Agriculture and Food
16. Fungicide options for controlling diseases in oats, Raj Malik and Blakely Paynter, Department of Agriculture and Food
17. Survey of wheat root diseases under intensive cereal production in Western Australia during 2005-2007, Ravjit Khangura, William MacLeod, Vivien Vanstone, Colin Hanbury, Mehreteab Aberra, Gordon MacNish and Robert Loughman, Department of Agriculture and Food
18. Epidemiology studies on Wheat Streak Mosaic Virus in 2007, Brenda Coutts, Geoff Strickland, Monica Kehoe, Dustin Severtson and Roger Jones, Department of Agriculture and Food
19. Bacterial diseases that affect WA export hay quality, Dominie Wright and Megan Jordan, Department of Agriculture and Food
SOIL
20. Hardpan penetration ability of drought-stressed wheat under pot and field conditions, Xinhua He1, Eli Manyol1, Song-Ai Nio1, Imran Malik1, Tina Botwright-Acuña1,2and Len Wade1,3,1School of Plant Biology, University of Western Australia, 2Tasmanian Institute of Agricultural Research, University of Tasmania, TAS, 3E.H. Graham Centre, Charles Sturt University, NSW
HARVEST MANAGEMENT
21. Calculating the risk â the SEPWA Harvest Calculator, Nigel Metz, South East Premium Wheat Growers Association
22. The relationship between grain moisture and atmospheric conditions in cereal crop harvesting on the South Coast of WA, Nigel Metz, South East Premium Wheat Growers Association (SEPWA)
MARKETS
23. Varietal accreditation for Australian Barley, Linda Price, Barley Australia
STATISTICAL METHODS
24. Applying data mining tools to improve grain quality for growers, Dean Diepeveen1, Leisa Armstrong2, Peter Clarke1, Doug Abrecht1, Rudi Appels2 and Matthew Bellgard3,1Department of Agriculture and Food, Western Australia 2Edith Cowan University, Western Australia, 3Centre of Comparative Genomics, Murdoch Universit
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