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Development Changes (development + change)
Selected AbstractsDevelopment changes of anthocyanins in Vitis vinifera grapes grown in the Douro Valley and concentration in respective winesJOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE, Issue 14 2002Nuno Mateus Abstract Grapes of Touriga Nacional and Touriga Francesa red Vitis vinifera varieties have been sampled from two vineyard sites at different altitudes during three consecutive vintage years (1997, 1998 and 1999) in the Douro Valley. The total anthocyanidin monoglucosides (AMGs) detected by HPLC/DAD and the red colour of grape skin extracts were monitored during the last month of maturation. Microvinifications were performed with the grapes studied and the resulting Port wines were analysed. Malvidin 3-glucoside and its acylated esters were the major AMGs irrespective of cultivar at harvest date. Vineyard altitude, together with other variables, was found to be an important factor contributing to the amount of anthocyanin compounds found in grapes of Touriga Nacional and Touriga Francesa. Overall, the climatic conditions observed at higher vineyard sites appeared to be advantageous, resulting in larger amounts of AMGs in grapes. The same outcome was obtained in the resulting wines, which showed higher levels of AMGs when made from grapes grown at higher altitude, especially for Touriga Francesa. © 2002 Society of Chemical Industry [source] Transnational migration: taking stock and future directionsGLOBAL NETWORKS, Issue 3 2001Peggy Levitt Increasing numbers of sending states are systematically offering social and political membership to migrants residing outside their territories. The proliferation of these dual memberships contradicts conventional notions about immigrant incorporation, their impact on sending countries, and the relationship between migration and development in both contexts. But how do ordinary individuals actually live their lives across borders? Is assimilation incompatible with transnational membership? How does economic and social development change when it takes place across borders? This article takes stock of what is known about everyday transnational practices and the institutional actors that facilitate or impede them and outlines questions for future research. In it, I define what I mean by transnational practices and describe the institutions that create and are created by these activities. I discuss the ways in which they distribute migrants' resources and energies across borders, based primarily on studies of migration to the United States. [source] The effects of age and sex on mental rotation performance, verbal performance, and brain electrical activityDEVELOPMENTAL PSYCHOBIOLOGY, Issue 4 2002Jonathan E. Roberts Abstract This study examined the effects of age and sex on mental rotation performance, verbal performance, and brain-wave activity. Thirty-two 8-year-olds (16 boys) and 32 college students (16 men) had EEG recorded at baseline and while performing four computerized tasks: a two-dimensional (2D) gingerbread man mental rotation, a 2D alphanumeric mental rotation, of three-dimensional (3D) basketball player mental rotation, and lexical decision making. Additionally, participants completed a paper- and pencil water level task and an oral verbal fluency task. On the 2D alphanumeric and 3D basketball player mental rotation tasks, men performed better than boys, but the performance of women and girls did not differ. On the water level task, men performed better than women whereas there was no difference between boys and girls. No sex differences were found on the 2D gingerbread man mental rotation, lexical decision-making, and verbal fluency tasks. EEG analyses indicated that men exhibited left posterior temporal activation during the 2D alphanumeric task and that men and boys both exhibited greater left parietal activation than women and girls during the 2D gingerbread man task. On the 3D basketball player mental rotation task, all participants exhibited greater activation of the right parietal area than the left parietal area. These data give insight into the brain activity and cognitive development changes that occur between childhood and adulthood. © 2002 Wiley Periodicals, Inc. Dev Psychobiol 40: 391,407, 2002. Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/dev.10039 [source] Abundant genetic variation in transcript level during early Drosophila developmentEVOLUTION AND DEVELOPMENT, Issue 6 2008Sergey V. Nuzhdin SUMMARY Variation in gene expression may underlie many important evolutionary traits. However, it is not known at what stage in organismal development changes in gene expression are most likely to result in changes in phenotype. One widely held belief is that changes in early development are more likely to result in changes in downstream phenotypes. In order to discover how much genetic variation for transcript level is present in natural populations, we studied zygotic gene expression in nine inbred lines of Drosophila melanogaster at two time points in their development. We find abundant variation for transcript level both between lines and over time; close to half of all expressed genes show a significant line effect at either time point. We examine the contribution of maternally loaded genes to this variation, as well as the contribution of variation in upstream genes to variation in their downstream targets in two well-studied gene regulatory networks. Finally, we estimate the dimensionality of gene expression in these two networks and find that,despite large numbers of varying genes,there appear to be only two factors controlling this variation. [source] | ||||||||||