International Journal of Global Community (Riksawan Institute - IJGC-RI)
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Multi-niveau latente klasse analyse: Met een toepassing bij het simultaan clusteren van landen en consumenten
No full textBespreking van: 'Het vrijzinnige kerklied' (over de dissertatie van A. le Coq, Wat vlied' of bezwijk'. Het vrijzinnige kerklied in Nederland 1870-1973, Kampen 2005)
No full text
The relationship between the big five personality factors and burnout:A study among volunteer counselors
No full textIn the present study of 80 volunteer counselors who cared for terminally ill patients, the authors examined the relationship between burnout as measured by the Maslach Burnout Inventory (C. Maslach, S. E. Jackson, & M. P. Leiter, 1996) and the 5 basic (Big Five) personality factors (A. A. J. Hendriks, 1997): extraversion, agreeableness, conscientiousness, emotional stability, and intellect/autonorny. The results of 3 separate stepwise multiple regression analyses showed that (a) emotional exhaustion is uniquely predicted by emotional stability; (b) depersonalization is predicted by emotional stability, extraversion, and intellect/autonomy and (c) personal accomplishment is predicted by extraversion and emotional stability. In addition, some of the basic personality factors moderated the relationship between relative number of negative experiences and burnout, suggesting that personality may help to protect against known risks of developing burnout in volunteer human service work.</p
Male influence on sex allocation in the parasitoid wasp Nasonia vitripennis
No full textSex allocation is an important reproductive decision for parents. However, it is often assumed that females have substantial control over sex allocation decisions, and this is particularly true in haplodiploid insects, in which females apparently determine sex by deciding whether to fertilise an egg (and produce a diploid daughter) or not (and produce a haploid son). Mechanisms by which males may influence sex allocation are not so straightforward, and their potential influence on sex ratios has been somewhat neglected. Here, we test whether males influence offspring sex ratios in the parasitoid wasp Nasonia vitripennis. We show that some of the variation in observed sex ratios can be attributed to males when comparing the affect of male strain on sex ratio. We did not find among-male variation in sex ratio with a less powerful experiment using males from only one strain or an effect of male mating environment. Our data suggest that males can influence female sex ratios and contribute to the variation around the sex ratios optimal for females. However, the influence is not large, suggesting that females have more influence on sex allocation than do males. We conclude by considering whether male influences on sex ratio represent differences in male reproductive competence or deliberate attempts by males to increase their fitness by influencing daughter production.</p
Changes in dopamine levels and locomotor activity in response to selection on virgin lifespan in <i>Drosophila melanogaster</i>
No full textAmong various other mechanisms, genetic differences in the production of reactive oxygen species are thought to underlie genetic variation for longevity. Here we report on possible changes in ROS production related processes in response to selection for divergent virgin lifespan in Drosophila. The selection lines were observed to differ significantly in dopamine levels and melanin pigmentation, which is associated with dopamine levels at eclosion. These findings confirm that variation in dopamine levels is associated with genetic variation for longevity. Dopamine has previously been implied in ROS production and in the occurrence of age-related neurodegenerative diseases. In addition, we propose a possible proximate mechanism by which dopamine levels affect longevity in Drosophila: We tested if increased dopamine levels were associated with a "rate-of-living" syndrome of increased activity and respiration levels, thus aggravating the level of oxidative stress. Findings on locomotor activity and oxygen consumption of short-lived flies were in line with expectations. However, the relation is not straightforward, as flies of the long-lived lines did not show any consistent differences in pigmentation or dopamine levels with respect to the control lines. Moreover, long-lived flies also had increased locomotor activity, but showed no consistent differences in respiration rate. This strongly suggests that the response for increased and decreased lifespan may be obtained by different mechanisms ER
Sociale zekerheid voor het oog van de meester:Opstellen voor prof. mr. F.M. Noordam
No full textElektronische versie van de gelijknamige gedrukte uitgave: Sociale zekerheid voor het oog van de meester. Opstellen voor prof. mr. F.M. Noordam / onder redactie van: M. Herweijer, G.J. Vonk, W.A. Zondag, Kluwer-Deventer 2006. ISBN 90-13-04052-
