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排序方式: 共有372条查询结果,搜索用时 19 毫秒
1.
Rudy Van Cauwenbergh Harry Robberecht Veerle Van Vlaslaer Hendrik Deelstra 《Journal of trace elements in medicine and biology》2004,18(1):99-112
Graphite furnace atomic absorption spectrometry, after improved matrix modification and using Zeeman background correction, was used to measure the serum selenium content of healthy adults living in the Antwerp region (Belgium). The mean serum concentration of 13 men and 13 women, sampled once a month during 1 year, was 84.3 +/- 9.4ng/ml with a broad range of 51.4-121.7 ng/ml. The intra-individual variation was remarkably high. Recent literature on selenium concentrations is reviewed and values are tabulated, with limitation to healthy adults and European countries. The mean serum selenium concentration measured corresponded well to older literature data for Belgium. The obtained values were found to be in the medium range compared with the literature data for other European countries. 相似文献
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The Role of Calcium Ions in the Acceleration of Resting Muscle Glycolysis by Extracellular Potassium 下载免费PDF全文
The activation of the glycolysis of resting muscle by increased extracellular potassium is dependent upon the simultaneous presence of calcium, but not of sodium ions. This regulation of metabolism by a membrane characteristic seems to act upon an early link in the glycolytic enzyme chain. 相似文献
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W. F. H. M. Mommaerts 《Protoplasma》1941,36(1):204-208
Zusammenfassung Es wurde die Frage gestellt, ob Askorbinsäure als Agens der alternden Extraktreihe im Sinne Gaillards zu betrachten ist.Aus den ausgeführten Bestimmungen ergab sich, daß der Askorbinsäuregehalt sich bei Extrakten von Embryonen verschiedenen Alters nur wenig ändert; Askorbinsäure scheint also während der Entwicklung im Überschuß anwesend zu sein, und die Differenzierung nicht spezifisch zu beeinflussen.
Summary The question has been raised, whether ascorbic acid is to be considered as the agent of the ageing extract series in the sense of Gaillard.Chemical determinations however showed, that the ascorbic acid contents in the case of extracts of embryos of different age differ only to a minor degree; it seems therefore that ascorbic acid never is limiting factor with respect to differentiation during ontogenesis.相似文献
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Performing music on the basis of reading a score requires reading ahead of what is being played in order to anticipate the necessary actions to produce the notes. Score reading thus not only involves the decoding of a visual score and the comparison to the auditory feedback, but also short-term storage of the musical information due to the delay of the auditory feedback during reading ahead. This study investigates the mechanisms of encoding of musical information in short-term memory during such a complicated procedure. There were three parts in this study. First, professional musicians participated in an electroencephalographic (EEG) experiment to study the slow wave potentials during a time interval of short-term memory storage in a situation that requires cross-modal translation and short-term storage of visual material to be compared with delayed auditory material, as it is the case in music score reading. This delayed visual-to-auditory matching task was compared with delayed visual-visual and auditory-auditory matching tasks in terms of EEG topography and voltage amplitudes. Second, an additional behavioural experiment was performed to determine which type of distractor would be the most interfering with the score reading-like task. Third, the self-reported strategies of the participants were also analyzed. All three parts of this study point towards the same conclusion according to which during music score reading, the musician most likely first translates the visual score into an auditory cue, probably starting around 700 or 1300 ms, ready for storage and delayed comparison with the auditory feedback. 相似文献
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Helen S. Findlay Yuri Artioli Juan Moreno Navas Sebastian J. Hennige Laura C. Wicks Veerle A. I. Huvenne E. Malcolm S. Woodward J. Murray Roberts 《Global Change Biology》2013,19(9):2708-2719
Cold‐water coral (CWC) reefs are recognized as ecologically and biologically significant areas that generate habitats and diversity. The interaction between hydrodynamics and CWCs has been well studied at the Mingulay Reef Complex, a relatively shallow area of reefs found on the continental shelf off Scotland, UK. Within ‘Mingulay Area 01’ a rapid tidal downwelling of surface waters, brought about as an internal wave, is known to supply warmer, phytoplankton‐rich waters to corals growing on the northern flank of an east‐west trending seabed ridge. This study shows that this tidal downwelling also causes short‐term perturbations in the inorganic carbon (CT) and nutrient dynamics through the water column and immediately above the reef. Over a 14 h period, corresponding to one semi‐diurnal tidal cycle, seawater pH overlying the reef varied by ca. 0.1 pH unit, while pCO2 shifted by >60 μatm, a shift equivalent to a ca. 25 year jump into the future, with respect to atmospheric pCO2. During the summer stratified period, these downwelling events result in the reef being washed over with surface water that has higher pH, is warmer, nutrient depleted, but rich in phytoplankton‐derived particles compared to the deeper waters in which the corals sit. Empirical observations, together with outputs from the European Regional Shelf Sea Ecosystem Model, demonstrate that the variability that the CWC reefs experience changes through the seasons and into the future. Hence, as ocean acidification and warming increase into the future, the downwelling event specific to this site could provide short‐term amelioration of corrosive conditions at certain times of the year; however, it could additionally result in enhanced detrimental impacts of warming on CWCs. Natural variability in the CT and nutrient conditions, as well as local hydrodynamic regimes, must be accounted for in any future predictions concerning the responses of marine ecosystems to climate change. 相似文献
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Tim Hendrikx Veerle Bieghs Sofie M. A. Walenbergh Patrick J. van Gorp Fons Verheyen Mike L. J. Jeurissen Mandy M. F. Steinbusch Nathalie Vaes Christoph J. Binder Ger H. Koek Rinke Stienstra Mihai G. Netea Marten H. Hofker Ronit Shiri-Sverdlov 《PloS one》2013,8(12)