Loop quantum gravity induced modifications to particle dynamics

The construction of effective Hamiltonians arising from Loop Quantum Gravity and incorporating Planck scale corrections to the dynamics of photons and spin 1/2 particles is summarized. The imposition of strict bounds upon some parameters of the model using already existing experimental data is also reviewed.Comment: 9 pages, 0 figures, talk presented at the X Mexican School of Particles and Fields, latex, aipproc style 6x

Samen werken aan samenwerking

Op het gebied van horizontale samenwerking is er veel mogelijk qua vorm, intensiteit, werkterrein en juridische constructie, zowel in de agrosector als in het mkb. De vele mogelijkheden bieden veel aangrijpingspunten om privé- en bedrijfsdoelen beter te kunnen bereiken, onder andere door meer denk- en slagkracht, ook financieel, en sociale voordelen als steun en meer vrije tijd. Samenwerking vraagt echter ook veel van de ondernemers en hun competenties. In dit onderzoek is vooral gekeken naar horizontale samenwerking: tussen soortgelijke ondernemers onderlin

NEN-norm voor modelleren in het waterbeheer

De inhoud van het handboek 'Vloeiend modelleren in het waterbeheer' (Good Modelling Practice), dat eind 1999 uitkwam en de NEN-norm die hier een uitvloeisel van is worden toegelicht en de auteurs geven suggesties voor het gebruik erva

Anthocyanin production as a potential visual selection marker during plant transformation

A mutant allele of the transcription factor gene MYB10 from apple induces anthocyanin production throughout the plant. This gene, including its upstream promoter, gene coding region and terminator sequence, was introduced into apple, strawberry and potato plants to determine whether it could be used as a visible selectable marker for plant transformation as an alternative to chemically selectable markers, such as kanamycin resistance. After transformation, red coloured calli, red shoots and red well-growing plants were scored. Red and green shoots were harvested from apple explants and examined for the presence of the MYB10 gene by PCR analysis. Red shoots of apple explants always contained the MYB10 gene but not all MYB10 containing shoots were red. Strawberry plants transformed with the MYB10 gene showed anthocyanin accumulation in leaves and roots. No visible accumulation of anthocyanin could be observed in potato plants grown in vitro, even the ones carrying the MYB10 gene. However, acid methanol extracts of potato shoots or roots carrying the MYB10 gene contained up to four times higher anthocyanin content than control plants. Therefore anthocyanin production as result of the apple MYB10 gene can be used as a selectable marker for apple, strawberry and potato transformation, replacing kanamycin resistance

A candidate gene survey of quantitative trait loci affecting chemical composition in tomato fruit

In tomato, numerous wild-related species have been demonstrated to be untapped sources of valuable genetic variability, including pathogen-resistance genes, nutritional, and industrial quality traits. From a collection of S. pennellii introgressed lines, 889 fruit metabolic loci (QML) and 326 yield-associated loci (YAL), distributed across the tomato genome, had been identified previously. By using a combination of molecular marker sequence analysis, PCR amplification and sequencing, analysis of allelic variation, and evaluation of co-response between gene expression and metabolite composition traits, the present report, provides a comprehensive list of candidate genes co-localizing with a subset of 106 QML and 20 YAL associated either with important agronomic or nutritional characteristics. This combined strategy allowed the identification and analysis of 127 candidate genes located in 16 regions of the tomato genome. Eighty-five genes were cloned and partially sequenced, totalling 45 816 and 45 787 bases from S. lycopersicum and S. pennellii, respectively. Allelic variation at the amino acid level was confirmed for 37 of these candidates. Furthermore, out of the 127 gene-metabolite co-locations, some 56 were recovered following correlation of parallel transcript and metabolite profiling. Results obtained here represent the initial steps in the integration of genetic, genomic, and expressional patterns of genes co-localizing with chemical compositional traits of the tomato fruit

NEN-norm voor modelleren in het waterbeheer

De inhoud van het handboek 'Vloeiend modelleren in het waterbeheer' (Good Modelling Practice), dat eind 1999 uitkwam en de NEN-norm die hier een uitvloeisel van is worden toegelicht en de auteurs geven suggesties voor het gebruik erva