University of Groningen

About: University of Groningen is a education organization based out in Groningen, Groningen, Netherlands. It is known for research contribution in the topics: Population & Context (language use). The organization has 36346 authors who have published 69116 publications receiving 2940370 citations. The organization is also known as: Rijksuniversiteit Groningen & RUG.

Sex Determination in the Hymenoptera

Abstract: The dominant and ancestral mode of sex determination in the Hymenoptera is arrhenotokous parthenogenesis, in which diploid females develop from fertilized eggs and haploid males develop from unfertilized eggs. We discuss recent progress in the understanding of the genetic and cytoplasmic mechanisms that make arrhenotoky possible. The best-understood mode of sex determination in the Hymenoptera is complementary sex determination (CSD), in which diploid males are produced under conditions of inbreeding. The gene mediating CSD has recently been cloned in the honey bee and has been named the complementary sex determiner. However, CSD is only known from 4 of 21 hymenopteran superfamilies, with some taxa showing clear evidence of the absence of CSD. Sex determination in the model hymenopteran Nasonia vitripennis does not involve CSD, but it is consistent with a form of genomic imprinting in which activation of the female developmental pathway requires paternally derived genes. Some other hymenopterans are not arrhenotokous but instead exhibit thelytoky or paternal genome elimination.

Innovative behaviour and job involvement at the price of conflict and less satisfactory relations with co-workers

Abstract: Although innovative behaviour is widely claimed to contribute to long term organizational effectiveness, the price that an individual worker may have to pay for taking an innovative approach has generally not been examined. The present study hypothesizes that a worker's innovative behaviour interacts with his or her job involvement in producing conflict and less satisfactory relations with resisting co-workers who want to prevent innovative change. Moreover, conflict with co-workers is hypothesized to mediate the interactive effect of innovative behaviour and job involvement on satisfaction with co-worker relations. These hypotheses were supported in a survey study among 76 secondary school teachers based on supervisor ratings of the teachers' innovative behaviour and teachers' self-report data of job involvement, conflict with co-workers and satisfaction with co-worker relations.

Breaking Through the Clutter: Benefits of Advertisement Originality and Familiarity for Brand Attention and Memory

Abstract: Rising levels of advertising competition have made it increasingly difficult to attract and hold consumers' attention and to establish strong memory traces for the advertised brand. A common communication strategy to break through this competitive clutter is to increase ad originality. However, ad originality may have detrimental effects when consumers pay more attention to the ad at the expense of the advertised brand. Moreover, the positive effects of originality may quickly wane when the ad becomes familiar. Surprisingly, no research to date has examined such brand attention and memory effects of ad originality and familiarity. The current study aims to fill this void. We use a stochastic model of the influence that ad originality and familiarity have on consumers' eye fixations to the key elements of advertisements--brand, text, and pictorial--and how the information extracted during eye fixations promotes memory for the advertised brand. The model explicitly accounts for heterogeneity due to consumers and advertisements. Infrared eye tracking was applied to collect eye fixation data from 119 consumers who paged through two general-audience magazines containing 58 full-page advertisements. Memory for the advertised brands was assessed with an indirect memory task. The model was estimated using Markov Chain Monte Carlo (MCMC) methods. In support of our hypotheses, original advertisements drew more attention to the advertised brand. More importantly however, advertisements that were both original and familiar attracted the largest amount of attention to the advertised brand, which improved subsequent brand memory. In addition, original and familiar ads were found to promote brand memory directly. Implications of these findings for communication and media planning strategy are discussed.

Insitu photopolymerization of oriented liquid-crystalline acrylates .3. oriented polymer networks from a mesogenic diacrylate

Abstract: Synthesis, mesomorphism, orientation and photo-initiated chain crosslinking of the liquid-crystalline diacrylate 1,4-phenylene bis{4-[6-(acryloyloxy)hexyloxy]benzoate} (1) are studied. Monomer 1 exhibits a broad nematic phase between 108 and 155°C and a monotropic smectic phase below 88°C. The monomer is uniaxially oriented in its nematic phase at a substrate which has been coated with polyimide and unidirectionally rubbed with tissue. At the transition temperature to the smectic phase the order parameter is measured to be 0,7. During polymerization, the ordering of the mesogens is frozen-in, yielding a uniaxially crosslinked network. The clear films of oriented poly(1) exhibit a birefringence Δn between 0,12 and 0,15, depending on the polymerization temperature. In the highest oriented state of 1 a small reduction of the degree of order is observed during the crosslinking reaction, whereas at higher temperatures and lower ordering of 1, the uniaxially orientation increases upon reaction. A special feature of the oriented networks is that the ordering is maintained while heating at high temperatures. The polymerization of the acrylate groups in the mesomorphic phases proceeds fast and to high conversion. Below 90°C the polymerization behaviour is similar to that of conventional isotropic diacrylates. Above 90°C the polymerization reaction of the liquid-crystalline diacrylate proceeds faster than that of an isotropic diacrylate.