نتایج جستجو برای: reductive
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To meet the growing demand for food, substantial improvements in yields are needed. This is particularly the case for wheat, where global yield has stagnated in recent years. Increasing photosynthesis has been identified as a primary target to achieve yield improvements. To increase leaf photosynthesis in wheat, the level of the Calvin-Benson cycle enzyme sedoheptulose-1,7-biphosphatase (SBPase...
Motivated by the study of hyperkähler structures in moduli problems and hyperkähler implosion, we initiate the study of non-reductive hyperkähler and algebraic symplectic quotients with an eye towards those naturally tied to projective geometry, like cotangent bundles of blow-ups of linear arrangements of projective space. In the absence of a Kempf-Ness theorem for non-reductive quotients, we f...
A new iridium catalyzed reductive coupling reaction of Grignard reagents and tertiary amides affording functionalised tertiary amine products via an efficient and technically-simple one-pot, two-stage experimental protocol, is reported. The reaction – which can be carried out on gram-scale using as little as 1 mol% Vaska's complex [IrCl(CO)(PPh3)2] and TMDS as the terminal reductant for the ini...
In a recent paper, Shapiro and Sober (2007) defend two claims with respect to the master argument for epiphenomenalism, which is designed to rebut non-reductive physicalism: (i) relative to an interventionist account of causation, as most elaborately presented in (Woodward 2003), the master argument turns out to be invalid; and (ii) interventionism provides a means to experimentally uncover mic...
Geometric invariant theory (GIT) was developed in the 1960s by Mumford in order to construct quotients of reductive group actions on algebraic varieties and hence to construct and study a number of moduli spaces, including, for example, moduli spaces of bundles over a nonsingular projective curve [26, 28]. Moduli spaces often arise naturally as quotients of varieties by algebraic group actions,...
This paper describes the synthesis of a series of Pd(IV) complexes of general structure (N~C)(2)Pd(IV)(O(2)CR)(2) (N~C = a rigid cyclometalated ligand; O(2)CR = carboxylate) by reaction of (N~C)(2)Pd(II) with PhI(O(2)CR)(2). The majority of these complexes undergo clean C-O bond-forming reductive elimination, and the mechanism of this process has been investigated. A variety of experiments, inc...
In this paper, I give an explicit formula for the intersection indices of the Chern classes (defined earlier by the author) of an arbitrary reductive group with hypersurfaces. This formula has the following applications. First, it allows to compute explicitly the Euler characteristic of complete intersections in reductive groups thus extending the beautiful result by D. Bernstein and Khovanskii...
Chlorinated ethenes are among the most frequently detected groundwater contaminants in industrially developed countries. Although their degradation pathways have been understood, assessing the progress of natural attenuation of chlorinated ethenes still remains a challenge. Chlorinated ethenes undergo sequential reductive dechlorination under anoxic conditions; hence, the presence of less chlor...
a Centre for Ecology and Hydrology, Maclean Building, Benson Lane, Crowmarsh Gifford, Wallingford Oxfordshire, OX10 8BB, UK b Department of Geography, University College London, Gower Street, London WC1E 6BT, UK c College of Life Sciences, University of Exeter, Peter Lanyon Building, Penryn, Cornwall TR10 9EZ, UK d School of GeoSciences, Institute of Atmospheric and Environmental Sciences Crew ...
Mesophilic mineral-weathering bacteria inhabit the critical-zone of a perennially cold basaltic environment Stephen Summers, Bruce C. Thomson, Andrew S. Whiteley & Charles S. Cockell a Earth, Environment and Ecosystems, CEPSAR, The Open University, Milton Keynes, MK7 6AA, United Kingdom. b Centre for Ecology & Hydrology, Benson Lane, Crowmarsh Gifford, OX10 8BB. United Kingdom. c School of Eart...
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