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Search Results: 1 - 10 of 495 matches for " Ap Dijksterhuis "
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The rich get richer and the poor get poorer
Ingmar H. A. Franken,Irina Georgieva,Peter Muris,Ap Dijksterhuis
Judgment and Decision Making , 2006,
Abstract: Some studies have found that choices become more risk averse after gains and more risk seeking after losses, although other studies have found the opposite. The latter tend to use hypothetical cases that encourage deliberation. In the current study, we examined the effects of prior gains and losses on a task designed to encourage less reflective decision making, the Iowa Gambling Task (IGT). Fifty participants conducted a manipulated decision-making task in which one group gained money, whereas the other group lost money, followed by the IGT. Participants who experienced a prior monetary loss displayed more risky choice behavior on the IGT than subjects who experienced a prior gain. These effects were not mediated by a positive or negative affect, although the sample size may have been too small to detect a small effect.
Biodiversity in the Cladosporium herbarum complex (Davidiellaceae, Capnodiales), with standardisation of methods for Cladosporium taxonomy and diagnostics
K. Schubert,J.Z. Groenewald,U. Braun,J. Dijksterhuis
Studies in Mycology , 2007,
Abstract: The Cladosporium herbarum complex comprises five species for which Davidiella teleomorphs are known. Cladosporium herbarum s. str. (D. tassiana), C. macrocarpum (D. macrocarpa) and C. bruhnei (D. allicina) are distinguishable by having conidia of different width, and by teleomorph characters. Davidiella variabile is introduced as teleomorph of C. variabile, a homothallic species occurring on Spinacia, and D. macrospora is known to be the teleomorph of C. iridis on Iris spp. The C. herbarum complex combines low molecular distance with a high degree of clonal or inbreeding diversity. Entities differ from each other by multilocus sequence data and by phenetic differences, and thus can be interpreted to represent individual taxa. Isolates of the C. herbarum complex that were formerly associated with opportunistic human infections, cluster with C. bruhnei. Several species are newly described from hypersaline water, namely C. ramotenellum, C. tenellum, C. subinflatum, and C. herbaroides. Cladosporium pseudiridis collected from Iris sp. in New Zealand, is also a member of this species complex and shown to be distinct from C. iridis that occurs on this host elsewhere in the world. A further new species from New Zealand is C. sinuosum on Fuchsia excorticata. Cladosporium antarcticum is newly described from a lichen, Caloplaca regalis, collected in Antarctica, and C. subtilissimum from grape berries in the U.S.A., while the new combination C. ossifragi, the oldest valid name of the Cladosporium known from Narthecium in Europe, is proposed. Standard protocols and media are herewith proposed to facilitate future morphological examination of Cladosporium spp. in culture, and neotypes or epitypes are proposed for all species treated.
Classifying visuomotor workload in a driving simulator using subject specific spatial brain patterns
Chris Dijksterhuis,Dick de Waard,Ben L. J. M. Mulder
Frontiers in Neuroscience , 2013, DOI: 10.3389/fnins.2013.00149
Abstract: A passive Brain Computer Interface (BCI) is a system that responds to the spontaneously produced brain activity of its user and could be used to develop interactive task support. A human-machine system that could benefit from brain-based task support is the driver-car interaction system. To investigate the feasibility of such a system to detect changes in visuomotor workload, 34 drivers were exposed to several levels of driving demand in a driving simulator. Driving demand was manipulated by varying driving speed and by asking the drivers to comply to individually set lane keeping performance targets. Differences in the individual driver's workload levels were classified by applying the Common Spatial Pattern (CSP) and Fisher's linear discriminant analysis to frequency filtered electroencephalogram (EEG) data during an off line classification study. Several frequency ranges, EEG cap configurations, and condition pairs were explored. It was found that classifications were most accurate when based on high frequencies, larger electrode sets, and the frontal electrodes. Depending on these factors, classification accuracies across participants reached about 95% on average. The association between high accuracies and high frequencies suggests that part of the underlying information did not originate directly from neuronal activity. Nonetheless, average classification accuracies up to 75–80% were obtained from the lower EEG ranges that are likely to reflect neuronal activity. For a system designer, this implies that a passive BCI system may use several frequency ranges for workload classifications.
Assessment of heavy metals in Egretta thula: case study: Coroa Grande mangrove, Sepetiba Bay, Rio de Janeiro, Brazil
Ferreira, AP;
Brazilian Journal of Biology , 2011, DOI: 10.1590/S1519-69842011000100012
Abstract: this study focuses on metals analysis in kidney and liver tissues of egretta thula which were collected prostrate or newly dead in coroa grande mangrove, sepetiba bay, rio de janeiro, brazil, between march 2005 and october 2008. kidney and liver were collected and analysed to evaluate heavy metal pollution. high values and widest range were detected for all metals in liver and kidney tissues. geometric mean differences from metals concentrations for zn, cd, ni, pb, cu, and cr, respectively, were found in both organs. results from linear regression analysis were non-significant in kidney (r = -0.79975, p = 0.10428), and in liver (r = -0.53193, p = 0.35618). with anova analysis for metal accumulation differences (kidney*liver), at the 0.05 level, the results were significantly different (f = 33.17676, p = 0.00000; f = 12.47880, p = 0.00000). these results indicate that sepetiba bay shows worrying levels of metals in this study with e. thula, showing potential power of widespread biological and mutagenic adverse effects in trophic levels, and therefore, signalling risk to human health.
Potential impacts of climate change and variability on groundwater resources in Nigeria
AP Aizebeokhai
African Journal of Environmental Science and Technology , 2011,
Abstract: Climate change observed over the past decades has been consistently associated with modifications of components of the hydrological systems such as precipitation patterns, sea surface temperature, accelerated melting of glacier and ice caps, soil temperature and moisture, surface runoff and stream flow. Such changes are known to influence subsurface hydrological systems, which could lead to changes in groundwater recharge, discharge and storage of many aquifers. Although, there are uncertainties in the characterisation of climate change induced groundwater impacts due largely to multi-scale local and regional heterogeneity, there is need to evaluate groundwater resources, quality and vulnerability to climate change and variability. This paper attempts to assess the potential impacts of climate change and variability on groundwater resources availability and sustainability in Nigeria.
Des lan ados aux expatriés :1 l’Ethnie2 Blanche 3 entre les fleuves Sénégal et Casamance
AP Crosas
Africa Development , 2009,
Abstract: The region located between the Senegal and the Casamance rivers has a long history of the presence of Western white men. Although the characters and situations modeled by the ‘White Ethnic Group’ over time have been very varied, there are characteristics that are repeated, continuities associated with the ambiguity of social status, gender relations or economic specializations, on the boundary between both local and global levels. The paper explores the durability of a cultural boundary, suggesting avenues of research from the figure of lan ados. The analysis shows indications, repeated parallels between the effects of variations in boundary conditions on the collective ‘White’, swaying between maintaining their identity and integrating into indigenous communities. The author believes that a long-term perspective would help understand the current articulation of contingents of cooperation volunteers who come to the region, an understanding that could be extrapolated to other areas on the continent.
Impact of HIV and AIDS on the eldery: A case study of Chiladzulu district
AP Sefasi
Malawi Medical Journal , 2010,
Abstract: HIV may affect the elderly in a number of ways. They may become infected themselves; their children may suffer prolonged illness and incapacity, and need the elderly to look after them; the same children may then die from the illness, leaving the elderly without the support of the next generation; this bereavement also leaves the older people to meet funeral costs and then to take care of orphans left behind. HIV has impacts on old people in ways that are social , economic, psychological and physical in nature. Aims We wanted to understand the socio-economic impacts of HIV/AIDS on lives of older people following the death of their productive children, and to examine how the elderly struggle to take care of HIV/AIDS orphans. While it is generally appreciated that older people undergo such hardships, little research has been done in Malawi to unravel the magnitude of these problems. We hope that our findings will increase awareness and lead to more being done to alleviate the problems faced by older people as a result of HIV/AIDS. Results The results reveal that older people have no alternative but to provide care and support to their ill children, and following the death of their children to become parents again in taking care of the orphaned grandchildren. This is a particularly big challenge in a country like Malawi, dependent on hand-hoeing for subsistence agriculture, where food production requires people who are physically strong. 79% of older people taking care of HIV/AIDS patients or orphans were found to have limited or no information about HIV/AIDS. 31% were dependent on relatives for support, while 69% sustained themselves through piece work, small business or farming. Conclusion Elderly people need more resources and assistance to enable them to fulfil their vital role in caring for HIV-AIDS orphans. They are also in critical need of more information about HIV-AIDS, as many are sexually active with multiple partners, and preventive information is currently not reaching this important section of the community.
Philosophy for Children: the quest for an African perspective
AP Ndofirepi
South African Journal of Education , 2011,
Abstract: The debate as to whether philosophy is suitable for children is an ancient one and the discussion of philosophical issues has been withheld from the young since Plato’s time. This paper seeks to examine the possibility of a Philosophy for Children programme in Africa. This presentation is a critical discourse on the concept of Philosophy for Children in the context of Africa through African-centred criteria. The paper attempts to recover aspects of the traditional African education and ways of philosophizing that may have been effective for earlier purposes but now need to be reconceptualised in new ways to serve today’s purposes. This document discussion shows the need to hybridize traditional African ways of doing philosophy with children within the 21st century African milieu.
Serotonin Immunoreactive Cells and Nerve Fibers in the Mucosa of the Rat Stomach
AP Gesase
Tanzania Journal of Science , 2009,
Abstract: The current study has showed the morphological features of serotonin (5-hydroxytryptamine) immunoreactivity in the pyloric mucosa of the rat stomach. The immunoreactive elements included the endocrine cells, mast cells and mucosal nerve fibers in the lamina propria. The immunopositive endocrine cells were oval in shape and located mostly in the basal part of the gastric glands. The cell contained a central non-staining area and the peripheral staining zone. The mast cells stained homogenously and appeared to be oval-round in shape. They were located in the upper, middle and basal parts of the mucosa. Serotonin immunoreactive nerve fibers with varicosities were located in the space between the gastric glands in the lamina propria. They appeared not to be in contact with the immunopositive endocrine and mast cells. The current study shows that serotonin may be released by the immunoreactive elements in the stomach and that future work is needed to characterize the ultrastructural features of serotonin positive nerve fibers in the pyloric mucosa.
Tobacco Control in India
AP Singh
Journal of Universal College of Medical Sciences , 2013, DOI: 10.3126/jucms.v1i2.8411
Abstract: DOI: http://dx.doi.org/10.3126/jucms.v1i2.8411 Journal of Universal College of Medical Sciences Vol.1(2) 2013: 44-45
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