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- Kleczkowski, Leszek A, 1954-
(author)
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GLUCOSE ACTIVATION AND METABOLISM THROUGH UDP-GLUCOSE PYROPHOSPHORYLASE IN PLANTS
- 1994
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In: Phytochemistry. - 0031-9422 .- 1873-3700. ; 37:6, s. 1507-1515
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Research review (peer-reviewed)abstract
- Recent developments in studies on the characterization of properties and functions of UDP-glucose pyrophosphorylase (UGPase) in plant metabolism are presented. UGPase constitutes a reversible enzymatic step for interconversions between starch and sucrose metabolites, and is responsible for synthesis and metabolism of UDP-glucose, a major form of nucleoside diphosphoglucose in plant cells. The enzyme, although considered not to have any regulatory function, has attracted considerable interest due to its ubiquitous distribution in plants, high activity, especially in sink tissues, and because of the key role of UDP-glucose as a direct or indirect precursor of sucrose, starch and structural polysaccharides. The enzyme has been the subject of biotechnological manipulations to engineer its kinetic properties and gene expression in relation to metabolic processes at the sucrose/starch interface. Depending on tissue type, the UGPase reaction may be channelled in vivo, either toward UDP-glucose pyrophosphorolysis or synthesis, due to a metabolic coupling to other reactions of sugar pathways. Some strategies for future research on plant UGPase are discussed.
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- Sundqvist, Bertil
(author)
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High metallic resistivities and resistivity saturation : High-pressure and thermal expansion effects
- 1993
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In: Modern physics letters B. - 0217-9849. ; 7:8, s. 491-499
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Research review (other academic/artistic)abstract
- Some recent developments in the field of resistivity saturation in metallic materials are discussed, concentrating on effects of thermal expansion and high pressures. It is shown that thermal expansion effects can significantly modify the measured temperature dependence of the resistivity, and that high pressure studies are an important, but little used, source of information. Examples are shown for transition metals and alloys, high transition temperature superconductors, and graphite intercalation compounds.
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