3,978 research outputs found
Abdominal weight and inspiratory resistance: their immediate effects on inspiratory muscle functions during maximal voluntary breathing in chronic tetraplegic patients
No full textWood smoke extract induces oxidative stress-mediated caspase-independent apoptosis in human lung endothelial cells: role of AIF and EndoG
No full textAbdominal weight and inspiratory resistance: their immediate effects on inspiratory muscle function during maximal voluntary breathing in tetraplegic patients
No full textIdentification of an alkylhydroquinone from Rhus succedanea as an inhibitor of tyrosinase and melanogenesis
No full textSeabed foraging by Antarctic krill: Implications for stock assessment, bentho-pelagic coupling, and the vertical transfer of iron
No full textA compilation of more than 30 studies shows that adult Antarctic krill (Euphausia superba) may frequent benthic habitats year-round, in shelf as well as oceanic waters and throughout their circumpolar range. Net and acoustic data from the Scotia Sea show that in summer 2-20% of the population reside at depths between 200 and 2000 m, and that large aggregations can form above the seabed. Local differences in the vertical distribution of krill indicate that reduced feeding success in surface waters, either due to predator encounter or food shortage, might initiate such deep migrations and results in benthic feeding. Fatty acid and microscopic analyses of stomach content confirm two different foraging habitats for Antarctic krill: the upper ocean, where fresh phytoplankton is the main food source, and deeper water or the seabed, where detritus and copepods are consumed. Krill caught in upper waters retain signals of benthic feeding, suggesting frequent and dynamic exchange between surface and seabed. Krill contained up to 260 nmol iron per stomach when returning from seabed feeding. About 5% of this iron is labile, i.e., potentially available to phytoplankton. Due to their large biomass, frequent benthic feeding, and acidic digestion of particulate iron, krill might facilitate an input of new iron to Southern Ocean surface waters. Deep migrations and foraging at the seabed are significant parts of krill ecology, and the vertical fluxes involved in this behavior are important for the coupling of benthic and pelagic food webs and their elemental repositories
Task-oriented progressive resistance strength training improves muscle strength and functional performance in individuals with stroke.
No full textSC
An analysis of layout and temperature effects on magnetic-coupling factor, resistive-coupling factor, and power gain performances of RF transformers for RFIC applications
No full text[[abstract]]In this paper, we demonstrate a comprehensive analysis of the temperature effect (from -25 degrees C to 175 degrees C) on the quality-factors (Q(1) and Q(2)), magnetic-coupling factor (K-Im), resistive-coupling factor (K-Re), maximum available power gain (G(A max)) and minimum noise figure (NFmin) performances of RF bifilar and stacked transformers for RFIC applications. Excellent G(A max) of 0.713 and 0.806 (that is, NFmin of 1.469 and 0.937 dB) were achieved at 5 and 7 GHz, respectively, at room temperature, for a 1:1 stacked transformer mainly due to its high K-Im and K-Re. In addition, for the 1:1 bifilar transformer at room temperature, though its K-Im and K-Re ar low, good G(A max) of 0.636 and 0.631 (that is, NFmin of 1.965 and 2.0 dB) were still achieved at 5 and 7 GHz, respectively, mainly due to its high Q(1) and Q(2). The present analysis is helpful for RF engineers to design temperature-insensitive ultra-low-voltage high-performance transformer-feedback low-noise-amplifiers (LNAs) and voltage-controlled-oscillators (VCOs), and other radio-frequency integrated circuits (RF-ICs) which include transformers. (c) 22006 Wiley Periodicals, Inc.[[note]]SC
Rapid and selective isolation of beta-xylosidase through an activity-based chemical approach
No full textNatural and anthropogenic forest fires recorded in the Holocene pollen record from a Jinchuan peat bog, northeastern China
No full textPollen and charcoal particles from a Jinchuan peat (northeastern China) were examined to investigate the fire origin and interaction between
climate, vegetation, fire and human activity during the Holocene. Pollen results show that: (i) a broadleaved deciduous forest was dominant during
the early Holocene; (ii) from ~5500 cal. yr B.P. there was a gradual increase in coniferous trees (mainly Pinus), and a decrease in broadleaved
deciduous trees (e.g. Quercus, Juglans, and Ulmus–Zelkova); (iii) after ~4200 cal. yr B.P., the deciduous forest was replaced by a mixed forest of
coniferous and deciduous trees; (iv) coniferous trees including Pinus, Abies and Picea further increased after ~2000 cal. yr B.P., reflecting a
cooler and drier climate after ~5500–4200 cal. yr B.P. Two layers of abundant microfossil charcoal particles (250–10 μm) and the coexistence of
macrofossil particles (N2 mm) suggest two local fires: fire event 1 (5120±66 cal. yr B.P.) and fire event 2 (1288±8 cal. yr B.P., AD 662±8).
Charcoal layer 1, with a large amount of Monolete psilate spores, is superimposed on the long-term trend of vegetation changes, indicating a
natural origin for fire event 1 that was probably facilitated by drying environmental conditions since the mid-Holocene. Cerealia-type pollen and a
low percentage of Monolete psilate spores were observed in charcoal layer 2, indicating that fire event 2 was caused by clearing. We suggest that
fire event 2 may be related to the spread of the Han farming culture accompanied by the territorial expansion of the Tang Dynasty to the studied
area in AD 668
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