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Aboubakar Sako Kenneth G. MacLeod Catherine M. O’Reilly 《Journal of Great Lakes research》2007,33(4):806-815
In this study, we measured growth trends in oxygen and carbon isotopic ratios in whole sagittal otoliths from three adult centropomid fish (Lates stappersii) from each of three sub-basins of Lake Tanganyika, East Africa. Sampling density was 20 to 50 samples per otolith. Both δ18O and δ13C values increase with age. The δ18O data suggest that otoliths were precipitated near the expected equilibrium with the ambient environment (ca. +3.5‰) and support a migration pattern from surface waters during larval stages to deeper waters (40 to 80 m) for mature fish. Relatively high δ18O values in the southern sub-basin are consistent with cooler temperatures in the region during seasonal upwelling. The δ13C increase from otolith core to edge is large (up to 4‰) and is interpreted as due to ontogenetic changes in diet and contributions from a decrease in the proportion of respired CO2 incorporated into otolith carbonate as metabolic rates of the fish dropped with maturity. The data seem to successfully reveal life strategy and migration patterns of L. stappersii, document regional differences in lake conditions, and provide a record of temperature within the water column during which the fish lived. Higher resolution studies and analyses of historical samples could be used to constrain modern and past growth patterns, and to reconstruct past temperature gradients and productivity patterns in the lake. 相似文献
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Perkins Kenneth A.; Ciccocioppo Melinda; Jacobs Lynette; Doyle Todd; Caggiula Anthony 《Canadian Metallurgical Quarterly》2003,11(4):269
Nonpharmacological cues associated with drug intake may influence subjective and reinforcing effects of those drugs. Social drinkers (N = 80) participated in 2 sessions in which they rated and then consumed ad lib their preferred beer (with participants blind to brand). Visual and olfactory stimuli were obscured during 1 session (blocked) and not obscured during the other (unblocked). Dependent measures included ratings of "liking", "want another", and "desire to drink"; subjective mood; and ad lib beer consumption (reinforcement). Most ratings and ad lib consumption were lower during the blocked versus the unblocked condition. There were no interactions of blockade condition with sex and no effect of blockade on mood. These findings show that nonpharmacological stimuli associated with alcohol consumption influence alcohol's subjective and reinforcing effects. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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Psychoanalytic psychotherapy is threatened by two underlying social and economic developments. One is pressures of the marketplace that are altering all traditional professional relationships, threatening to undermine our familiar relationship with clients. The second is changes in the medical profession that call into question the appropriateness and utility of our long-standing link with medicine. The problems are explored and some suggestions put forth. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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Facilitatory priming effects due to similarity of orthographic form are obtained for high-N target words provided that they have low-frequency bodies and the body is shared between the prime and target (e.g., perd-HERD). Conversely, it is shown that low-N target words show priming regardless of the frequency of the body, provided that the prime and target do not share the same body (e.g., drice-DRIVE). If the body is shared, then priming occurs only for targets with low-frequency bodies. These results suggest that neighborhood density should be defined in terms of both individual letter units and subsyllabic units and that both types of density jointly determine priming. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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Analyzes the literature on 3 aspects of attachment—neurobiological influences, interpersonal and intrapersonal factors, and societal factors—in the psychological development of chronically disabled children. Evidence suggests that neurochemical substances such as cortisol and brain biogenic amine systems reciprocally interact with psychological and psychosocial factors to influence attachment. Interpersonal and intrapersonal factors such as temperamental characteristics of children, severity and type of disability, and family influences interact in the process of attachment. Social perceptions and prejudices about the disabled individual increase parental stress, and diminish parental involvement and resources, which are necessary for attachment. These 3 processes are powerful and interrelated forces in child development, with potential to modify social competence, neurological development, and psychosocial adjustment. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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Kenneth J. Mintz 《火与材料》1991,15(2):93-96
Combustible dusts, based on tests conducted in the Setchkin Furnace on five representative dusts, are shown to have two distinct layer minimum ignition temperatures, designated MITnon-flaming and MITflaming. The MITnon-flaming is the one usually reported in the literature; the MITflaming is determined by starting at a much higher temperature and working downwards. MITflaming can yield a different ranking of dust flammability than MITnon-flaming. The MITflaming appears to be more closely correlated to the MIT of dust clouds and to the test prescribed for flammable solids in the US Code of Federal Regulations than the MITnon-flaming. 相似文献
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Kenneth A. Bouldin 《Information Systems Management》1992,9(3):68-70
How can an IS department continue to meet its business's expanding needs without becoming a warehouse of expensive but outdated computer hardware and software? That is the challenge facing a growing number of businesses, one that is finding a surprisingly economic answer in new, flexible leasing programs. 相似文献